FIELD OF THE INVENTION

The present invention relates to a material clearing machine, and in particular to a material clearing machine of a very low height. BACKGROUND OF THE INVENTION

Mining is a massive business worldwide, producing countless tonnes of material, such as metal bearing ores or coal. Mines need to transport the mined product considerable distances from the mine face, for processing, or to transfer to a ship or rail truck for transportation elsewhere. Many mines utilise conveyors as a particularly efficient means for continually transporting tonnes of material over significant distances. When moving such vast quantities of coal or ore, some material inevitably spills from the conveyor. The spilled material tends to accumulate against fixed objects and especially around and under the conveyor. Conveyors can break down or be stopped completely due to the build-up of material underneath. Mine stoppages are highly undesirably as they are costly in terms of both time and loss of mineral or coal production.

Traditionally, management of spilled material waste, including that around conveyers, has been the task of mine workers and a shovel. Clearly, this is dangerous and backbreaking work. The conveyors must be stopped in order that the workers can safely clear material, which reduces efficiency and production of the mine. In more recent times, "skid steer" loaders have been used to mechanically shovel the material and to clear debris around conveyors. However, these loaders are much too big to get close to the conveyors, into comers or other small areas, and so cannot efficiently clear the spilled material. In particular, much of the spilled material collects under the conveyors, an area which is inaccessible to standard machines. It is also not possible to use the bucket of known "skid steer" machines under conveyors, as the bucket cannot be positioned low enough and there is insufficient height to use the hydraulics and angle the bucket. It is highly desirable for there to be a machine for clearing material, with a low enough height to get under a conveyor and other inaccessible areas. The following describes a non-limiting example of the invention being used with reference to use of the machine in the mining industry, and in particular for use with conveyors for moving coal or ore. The invention is particularly applicable to the mining industry. However, it is not intended that the invention be limited to use in the mining industry, or for clearing material around conveyors, or that the material be a mined product; there are numerous other applications of the invention.

For clarity, any prior art referred to herein, does not constitute an admission that the prior art forms part of the common general knowledge in Australia or elsewhere. It is an object of the present invention to provide a material clearing machine that at least ameliorates one or more of the aforementioned problems of the prior art.

Accordingly, the present invention provides a machine for clearing material, the machine including: a chassis; a body, connected to the chassis; drive means for driving the machine; and control means, for controlling the machine, wherein, in use, a tool attachment can be attached to the body and or chassis of the machine, the tool attachment being controllable by the control means and adapted to clear and or collect material, and the machine has a maximum height of approximately 400 millimetres.

Most preferably, the machine has a maximum height of substantially 360 millimetres. Alternatively, the machine may have a maximum height of substantially 370 millimetres. It is envisaged that the machine may be designed to have an even lower maximum height of substantially 300 millimetres or substantially 200 millimetres.

Preferably, the machine includes a hydraulic system.

Preferably, clearing of material includes any one or more of the following actions: moving; scraping; pushing: sweeping; brushing; collecting or picking up material; suctioning material away; blowing; burning; blasting or washing material with water; raking or shovelling.

The material to be cleared may be any suitable material. One particularly beneficial use of the invention is the use in mines to clear material fallen from conveyors. The material to be cleared may be any suitable mineral bearing ore. The material to be cleared may be coal. Alternatively, the material may be any debris or litter that needs clearing. The material may be any combination of materials.

Preferably, the chassis includes one or more wheels. Preferably, the chassis includes one or more pairs of wheels, one positioned on either side of the chassis. Preferably, a plurality of pairs of wheels are included, half of each pair of wheels positioned on one side of the chassis, and the other half of each pair of wheels positioned on the other side of the chassis. In a preferred form of the invention, three pairs of wheels are included. The or each wheel may be the same or different to one another. Preferably, the or each wheel is a metal wheel. The wheels may include a rubber tyre. The or each wheel, preferably, rotates on or about an axle. Preferably, the or each wheel is fixed to an axle. The or each wheel may rotate independently to any other wheel. Alternatively, one or more wheels may rotate in concert with one or more other wheels. The or each wheel may take any suitable form. Preferably, the or each wheel is a metal roller.

In a preferred form of the invention, preferably, the chassis includes at least one drive sprocket and the drive means drives the or each drive sprocket. Preferably, the chassis includes at least one pair of drive sprockets and the drive means drives the or each pair of drive sprockets. Preferably, the drive means drives the or each drive sprocket or the or each pair of drive sprockets so that the machine can move forward or back. The drive means may cause rotation of an axle to which one or more drive sprocket is attached. Preferably, the drive means can drive the or each drive sprocket on one side of the machine independently to the or each drive sprocket on the other side of the machine. In this manner the machine may be steered, by driving the right-hand drive sprocket most, to turn left and by driving the left-hand drive sprocket most, to turn right. Most preferably, the drive means moves the machine by use of the "skid steer" operation.

Preferably, the or each drive sprocket is made substantially of steel. The drive sprockets may be made of other suitable materials including other metals, in an alternative arrangement. Preferably, the or each drive sprocket is substantially circular. Preferably, the or each drive sprocket includes one or more projections. Preferably, the one or more projections are a plurality of engagement spikes.

Preferably, the or each drive sprocket is associated with a belt to create tracks on which the machine can move over the ground. More than one drive sprocket may be associated with any one belt. Preferably, there are a pair of belts one on either side of the chassis of the machine. The or each belt may be made of any suitable material. Preferably, the or each belt is made of a suitable rubber material. Preferably, the or each belt includes tread on the outer surface. The tread may be any suitable tread such as for soft, hard or uneven terrain. Most preferably, the or each belt includes one or more protuberance on the outer surface to facilitate the movement of the machine over uneven ground. In an alternative form of the invention, the wheels contact the ground directly. In this form of the invention, the drive means drives one or more wheels to enable the machine to move forward or back along the ground, as desired. Preferably, the or each drive sprocket includes one or more projection and the or each projection corresponds to, and can interlock with, one or more cut-out on the inner surface of the belt such that forward rotation of the drive sprocket also causes the belt to move forward. Most preferably, the or each drive sprocket includes a plurality of engagement spikes and each engagement spike corresponds to, and can interlock with, a plurality of cutouts on the inner surface of the belt such that forward rotation of the drive sprocket also causes the belt to move forward. Similarly, preferably, backward rotation of each drive sprocket is translated to backward movement of the belt by interlocking of one or more projection or engagement spike of the drive sprocket with one or more cut-out of the belt. Preferably, there are at least one pair of drive sprockets and at least one pair of wheels and the wheels rotate in response to forward or backward movement of the belt, the belt moving forward or back on rotation of the drive sprocket to move the machine forward or backwards, as appropriate. Preferably, there are a pair of drive sprockets positioned towards the rear of the chassis of the machine, each drive sprocket connected to an axle, and each drive sprocket surrounded by a belt, and the drive means drives the drive sprockets through rotation of one or both axles to move the machine backwards, forwards and or to the left or right. Preferably, the chassis includes one or more second sprocket. Preferably, a pair of second sprockets is included. Alternatively, several pairs of second sprockets may be included. The second pair of sprockets may be positioned towards an opposite end of the machine to a pair of drive sprockets and assist to maintain the belt around the sprockets and wheels. Preferably, the or each second sprocket is substantially circular. The or each second sprocket may include one or more projection. The or each projection is preferably an engagement spike. Preferably, the or each second sprocket includes a plurality of engagement spikes, spaced around the edge. Preferably, one or more projection, or plurality of engagement spikes, corresponds to and can interlock with one or more cut-out on the inner surface of the belt such that forward rotation of the belt also causes forward rotation of the second sprocket. Similarly, preferably, backward movement of the belt causes backwards rotation of the second sprocket. Preferably, the or each second sprocket is made of a suitable steel material. Any suitable metal or other material may be used. Alternatively, the or each second sprocket may be driven by the drive means. In this form of the invention the or each second sprocket may be driven forward or back, at the same time as the drive sprocket. Or the second sprocket may be driven forward and back, independently to the drive sprocket. Preferably, the or each drive sprocket or the or each second sprocket is associated with an axle. Preferably, the or each axle is made of steel. Preferably, the or each drive sprocket or second sprocket has its own axle, enabling independent movement.

Preferably, the chassis is adapted to enable movement of the machine when driven by the drive means. Preferably, the chassis includes means to support the or each drive sprocket and associated axle. Preferably, the chassis includes means to support the or each wheel and associated axle. Preferably, the chassis includes means to support the or each second sprocket and associated axle. Preferably, the chassis is a monolithic chassis. The chassis is, preferably, adapted to lie substantially on either side of the body. In a preferred form of the invention, the chassis includes and supports a belt on either side of the body of the machine, each belt surrounding a drive sprocket, several wheels and a second sprocket creating tracks on which the machine can move around. Preferably, the chassis includes two tracks, one on either side of the body. The two tracks may be attached one to the other.

Preferably, the chassis is made of steel, Preferably, the chassis has a maximum height of substantially 400 millimetres high. Most preferably, the chassis has a maximum height of substantially 360 millimetres. Alternatively, the chassis may have a maximum height of substantially 370 millimetres. In an alternative form of the invention, the chassis may be of a lower height than other parts of the machine. Preferably, the chassis is of a rugged construction, suitable for use in a mine or similar environment. Preferably, the chassis includes one or more panels. Preferably, a pair of side panels is included. Preferably, the side panels include one or more cutout or window. Preferably, the or each side panel includes one or more window to enable access inside the or each belt. Preferably, each side panel includes a window to enable access to the inside of the track for adjustment. The or each window may include a cover.

Preferably, the body is made substantially of steel. Preferably, the body is generally a rectangular or box shape. The body may fake any suitable shape or form. Preferably, the body is welded to the chassis. The body may, in an alternative form of the invention, be bolted or otherwise removably attached to the chassis. The chassis and body may be formed integrally with one another, in one form of the invention.

Preferably, the body has a flat top to facilitate access under very low machines or conveyors, for example. Preferably, the body and chassis fit together so as to minimise the overall height of the machine. Preferably, part of the body sits within the chassis, to minimise the height of the machine. Preferably, the body has a maximum height of substantially 400 millimetres. Most preferably, the body has a maximum height of substantially 360 millimetres. Alternatively, the body may have a maximum height of substantially 370 millimetres. In an alternative form of the invention, the body may be less than 300 millimetres high. In this form of the invention the machine has an overall height of 300 millimetres high.

The body may be open in some areas and closed in other areas. The body, preferably, contains more than one section to separate different parts of the machine. Preferably, the body enables isolation of different components of the machine. Preferably, the body is adapted to reduce the risk of an internal fire. Preferably, the body includes a front section, a rear section and a middle section. Preferably, the body includes a lower section. Preferably, the lower section of the body is a tank. Most preferably, the tank runs substantially the length of the body of the machine. In an alternative form of the invention, the tank may lie along only part of the bottom of the body. Most preferably, the tank is a tank for containing hydraulic fluid. Preferably, the hydraulic fluid is a fire resistant fluid. The fire resistant fluid may be glycol. Alternatively, in different forms of the invention the tank could be adapted to contain water or other liquids.

Preferably, the drive means includes one or more drive motors. Preferably, the or each drive sprocket is driven by the or each drive motor. Preferably, two drive motors are included, one to drive the left-hand side of the machine and one to drive the right-hand side of the machine. Preferably, there are a pair of drive sprockets and each drive sprocket is driven by a separate drive motor. Preferably, separate drive motors are included, one to drive the drive sprocket on the left-hand side of the machine forward or back and one to drive the drive sprocket on the right-hand side forward or back. Preferably, the machine can be driven using the "skid and steer" operation by use of one drive motor more than the other. Brakes may be included to prevent forward or backward movement of one or both drive sprockets, in an alternative form of the invention. Preferably, the or each drive motor translates rotation of the drive motor to rotation of an axle of the or each drive sprocket so that the drive sprocket rotates forward or back with the rotation of the drive motor. Preferably, in this way, movement is translated to the associated belt by interlocking the or each projection of the or each drive sprocket with the or each cut-out on the inner surface of the belt on either side of the machine, so the machine moves forward or back accordingly. Preferably, in this form of the invention the or each projection is a plurality of engagement spikes which engage with a corresponding plurality of cut-outs on the inner surface of the belt.

Most preferably, the control means includes a hydraulic system. Preferably, the control means includes an electrical system. Preferably, the hydraulic system includes a hydraulic tank for containing hydraulic fluid, connected to a hydraulic pump. Most preferably, the hydraulic pump is submerged in the hydraulic tank. The hydraulic tank is preferably formed along a bottom section of the machine. Preferably, the hydraulic tank is connected to the hydraulic pump by one or more hose. Preferably, the hydraulic pump is connected to one or more hydraulic valves by one or more hose. The hydraulic fluid may be any suitable hydraulic fluid. The hydraulic fluid may be engine oil, transmission fluid or the like.

Preferably, the hydraulic pump includes a motor. Preferably, the motor of the hydraulic pump includes a fan for cooling. The fan may be mounted to the top of the motor. Preferably, the hydraulic system includes one or more hydraulic valve connected to the hydraulic pump. Preferably, the control means enables hydraulic fluid to be pumped by the hydraulic pump from the hydraulic tank to a hydraulic control valve whereby the flow of hydraulic fluid is directed by the control means to control and or drive the machine and or the tool attachment. Preferably, the hydraulic control valve is associated with a solenoid valve. There may be more than one hydraulic control valve. In a preferred form of the invention, a hydraulic pump is adapted to provide a flow of hydraulic fluid to a hydraulic control valve, whereby a set pressure is maintained until a drop in pressure accommodates pilot oil for a solenoid valve, the pilot oil flows, in response to an electrical signal, to either one end or the other of the solenoid valve, such that hydraulic flow can then flow either to the drive means or to the tool attachment. Preferably, the flow of hydraulic fluid is directed back to the hydraulic tank, through a filter, after use. Preferably, the solenoid valve is positioned above the hydraulic control valve. There may be a plurality of solenoid valves, each positioned above a hydraulic control valve or other hydraulic valve.

Preferably, the flow of hydraulic fluid drives the drive means. Preferably, the hydraulic flow of the control means controls and drives the drive means. Preferably, the drive means includes drive motors and the flow of hydraulic fluid is used to control and or drive the drive motors. Preferably, the hydraulic system includes a plurality of hydraulic valves connected to a plurality of hoses through which hydraulic fluid can flow in response to the action of the hydraulic pump. Preferably, the hydraulic valves are controlled so as to drive the drive motors forward or back. Preferably, there are a pair of drive motors and each drive motor can be separately driven forward or back, on activation of the relevant hydraulic valve. Preferably, the or each drive motor is controlled by a remote control means. Preferably, one or more fan is included to keep the or each drive motor cool during operation. Preferably, a fan is mounted to the or each drive motor.

Preferably, the machine includes a power source. Preferably, the control means includes a power source. Alternatively, the drive means may include a power source. Preferably, the power source may provide power to a hydraulic pump. Alternatively, the power source may provide power to any of the drive motors, hydraulic valves, hydraulic control valves. The power source may provide power to accessories of the machine such as lights or cameras. Preferably, the hydraulic pump is powered by the power source and the hydraulic pump provides hydraulic force, directed by the or each hydraulic valve to drive the drive motors to drive the machine. Preferably, the power source provides power to part of the control means. Alternatively, the power source may provide power to the control means. In one form of the invention the machine may be powered and controlled entirely by use of electrical power, from a source such as an electric battery.

Preferably, the power source is one or more suitable battery. Preferably, there are two batteries. Preferably, the or each battery is a rechargeable battery. Preferably, the power source is one or more rechargeable battery and the machine can be driven to a recharging station which can connect to and recharge the or each rechargeable battery. Preferably, the or each rechargeable battery is connected to contact points on the outside of the machine such that the contact points connect to reciprocating contact points of the recharging station so that the or each rechargeable battery can be recharged. Most preferably, the or each rechargeable battery can be recharged on driving into the recharging station without any further action required by the user. Once the battery is recharged the machine may be driven out of the recharging station for use. Most preferably, the machine can be fully operated and recharged remotely, without direct contact with an operator. It is envisaged that the machine may be stored at the recharging station so that the or each rechargeable battery is regularly recharged. In this way the machine should be fully charged each time the machine is driven out, for use. Preferably, the charged state of the or each battery can be monitored by the operator. Preferably, a return voltage is sent to the operator to indicate the state of charge of the or each battery. It is most preferred to use one or more rechargeable battery as the power source. In an alternative form of the invention, the power source may be a mains supply, in this form of the invention, the mains supply may be supplied via an extension cable extending from the machine. The machine may include a retractable extension cable for connecting to the mains supply. Alternatively, the power supply may be any suitable power supply. The power supply may be a medium AC voltage or low DC voltage, for example. Or the power source may be an external hydraulic source. The external hydraulic source may be connected to the machine by a retractable umbilical cord.

Preferably, a section of the body is adapted to hold the or each battery. The section may be a front section or a rear section of the body. Preferably, the front section of the body is adapted to receive a pair of batteries. Where the battery is one or more rechargeable battery the body is adapted to enable contact between the terminals of the or each battery with reciprocating contacts of a battery charger so that the or each battery can be recharged. Preferably, a middle section of the body of the machine is adapted to substantially contain at least part of a hydraulic system. Preferably, the hydraulic pump and hydraulic valves are substantially contained within a middle section of the body. Preferably, the body of the machine is adapted to maintain the hydraulic pump and or the hydraulic valves in place as the machine moves along. The body may include recesses in which the base of the hydraulic pump and or the hydraulic valves substantially sit. Preferably, the recesses assist to maintain the hydraulic pump and hydraulic valves in fixed positions within the machine while the machine moves around. The skid steer operation puts pressure on the internal components moving them one way and then the other and it is most beneficial to maintain the components in a fixed position by use of recesses and the like. Preferably, a bottom section of the machine includes a hydraulic tank for hydraulic fluid. Most preferably, substantially the entire bottom of the body of the machine is a hydraulic tank. The upper surface of the hydraulic tank may include one or more recess. The upper surface of the hydraulic tank may include a recess for receipt of part of the hydraulic system. The recess may be adapted for receipt of the base of the hydraulic valves to maintain the hydraulic valves in place, as the machine moves. Alternatively, the hydraulic tank may form part of the chassis. In this form of the invention, the hydraulic tank may form substantially the entire bottom of the chassis. The base of the hydraulic tank may be reinforced against damage, which could potentially lead to loss of hydraulic fluid.

Preferably, the machine is controlled remotely. Preferably, the control means includes a remote control means. Preferably, the remote control means includes a remote control unit, operable by a person, and a radio receiver connected to the machine. Any suitable remote control means may be used. Any one or more parts of the machine are preferably controllable by remote control. Preferably, the tool attachment, when attached, can be controlled by remote control. Preferably, in use, operation of a control of the remote control unit creates an electrical signal in the remote control unit which in turn is converted to a radio signal which is sent to the radio receiver of the machine. Preferably, the radio receiver, on receipt of the radio signal from the operator, converts the radio signal to an electrical signal, this electrical signal being transferred to a solenoid valve mounted on the top of the hydraulic control valve of the control means. Preferably, the signals supplied consist of a constant 24 volt DC, an earth signal and a varying voltage with 12 volt DC being neutral and 0-12 volts DC being oneway and 12 volts DC-24 volts DC being in the opposite direction.

Preferably, when a signal is received from the remote control unit a voltage is also sent to a travel alarm, powering one or more warning means to indicate the machine is in operation. Preferably, the warning means includes a flashing light which flashes while the machine is in operation. Alternatively, where the machine is not remotely controlled (although it is highly preferable that is controlled remotely) the warning means may be activated when the power source is turned on and the machine is operational.

Preferably, when the machine receives a signal from the transmitter it activates the machine into standby mode, activating the flashing light and fan via a relay that cools the pump drive motor so that when a further input is received the timed relay is activated, which in turn activates the pump drive motor.

Preferably, when a signal is received from the remote control unit, by the machine, a signal is sent to a delay timer relay. Preferably, the delay timer relay maintains power to the hydraulic pump. Preferably, the delay timer relay maintains power to the hydraulic pump for a set time period after the signal from the remote control unit has ceased. Preferably, the delay timer relay is programmable so that the delay period can be set by the operator.

Preferably, a motor of the hydraulic pump creates flow of hydraulic fluid to a mains control valve and a set pressure is maintained, and a drop in pressure is set to accommodate pilot oil for the solenoid valve. Preferably, when an electrical signal is received it moves the solenoid that allows pilot oil to flow to either one end or the other of the main spool of the solenoid and this in turn allows main oil flow to the tool attachment to provide power or control to one of the drive motors to move the machine. Preferably, after use, hydraulic oil is directed back to the hydraulic tank through the valve, via a filter.

Preferably, power is supplied by the two batteries at 24 volts DC, via an isolator to a relay. The relay may receive a signal voltage from the delay timer relay that receives its power from the remote control means. Preferably, when the relay is in the closed position the relay supplies 24 volts DC to the motor of the hydraulic pump, whereby hydraulic pressure and flow is created. Preferably, when the signal from the remote control ceases the delay timer relay maintains power to the hydraulic pump and keeps the motor of the hydraulic pump running for a set period of time, after the signal has stopped. Preferably, if an input signal is received from the remote control unit within the set time period the delay timer will reset itself, and operate the motor of the hydraulic pump, until there is again a loss of remote signal. Preferably, when the signal is lost for a greater time period than that set on the delay timer relay the machine will put itself into standby mode, cancelling any current operations until such time the machine is again operated, by use of a reset or start button. Preferably, when a signal is received from the remote control unit, by the machine, a signal is sent to a delay timer relay and the delay timer relay maintains power to a hydraulic pump for a set time period after the signal from the remote control unit has ceased.

Preferably, the electrics of the control means include means of conveying the control signals of the radio receiver to the hydraulic system for controlling the machine and or tool attachment. Preferably, the electrics include one or more electrical circuits for controlling the machine and or tool attachment. Preferably, the electrics include any one or more of relays, isolators, circuits and switches as are required to control the machine and or tool attachment. In an alternative form of the invention, the remote control is not used and the electrics are connected by a wire to a control unit.

Preferably, more than one type of tool attachment can be attached to the machine. Preferably, the body and or chassis includes one or more attachment point and the or each tool attachment also includes one or more connection point corresponding to the or each attachment point of the body and or chassis wherein, in use, a tool attachment can be attached to the machine, for use, by connecting the or each connection point of the tool attachment to the or each connection point on the body and or chassis. Preferably, the or each connection point is included on the body of the machine. Preferably, the or each connection point is included on the front of the body and or chassis of the machine. The or each connection point may take any suitable form. Preferably, there are three connection points on the front of the body of the machine. Preferably, there are different connection points included on the front of the body or the chassis of the machine to enable different tool attachments to be attached. In an alternative form of the invention, tool attachments may be attachable to the back of the body and or chassis of the machine or to both the front and back of the body and or chassis of the machine, in another alternative form of the invention, one or more tool attachment may be formed integrally with the rest of the machine. Preferably, the body or chassis of the machine includes hydraulic connection points, connected to one or more hydraulic valves by a hose or pipe. Preferably, hydraulic connection points are included at the front of the body, enabling the tool attachment to be connected to the hydraulic system. Preferably, the tool attachment can be connected to the hydraulic system such that the tool attachment can be operated by the hydraulic system in response to instructions from the control means. Preferably, the tool attachment can be controlled by remote control means. In an alternative form of the invention the tool means may require no control and be a fixed tool, such as a fixed scraper that moves with the movement of the machine. There are great benefits to be able to control the tool attachment and it is preferred to be able to do so.

The or each tool attachment may include or be a blade attachment for moving or scraping material from one position to another position. Preferably, as the machine moves forward the blade attachment can move or scrape material in the path of the machine. Preferably, the blade attachment includes a blade head attached to two arms, the two arms including connection points which correspond to attachment points on the body and or chassis, wherein the blade attachment is attachable to the machine by connecting the connection points of the two arms to the attachment points on the body and or chassis. Preferably, the connection points of the two arms are substantially U-shaped and adapted to slide over a reciprocating attachment points of the body of the machine, each side of the U-shaped part of the connection point of the blade attachment, and the reciprocating part of the body of the machine, including a hole through which a bolt pin, D-c!amp or similar can be passed to secure the blade attachment to the body of the machine.

Preferably, the blade attachment is connected to a hydraulic system. Preferably, the blade head can be tilted to facilitate moving or scraping of the material. Preferably, the tilting of the blade is hydraulically controlled. Preferably, a hydraulic cylinder is included connectable to the hydraulic system of the machine such that on instruction from the control means the blade head can be raised or lowered. Alternatively, any suitable means such as mechanical or electrical means may be used to control the blade head. Preferably, the blade head can be controlled by remote control. Preferably, the blade head is controlled by the hydraulic system and the blade head and hydraulic system are controlled by remote control. The blade attachment may take any suitable form. Preferably, the blade is made substantially of steel. Preferably, the blade has a maximum height of substantially 300 millimetres. Preferably, the blade has a maximum width of 700 millimetres.

The or each tool attachment may include or be a bucket attachment for moving and or removing material. Preferably, the bucket attachment can be moved up or down to facilitate capture and or carrying of material. Preferably, when the bucket attachment is in the lowered position material can be captured in a bucket head, as the machine moves forward. Preferably, when the bucket attachment is raised, material can be carried forward or back as the machine moves forward or back, for example. Preferably, the bucket attachment can be moved up or down by hydraulic controls. Preferably, the bucket attachment is connectable to a hydraulic system. Preferably, the bucket attachment is connectable to hydraulic connection points of the body and or chassis of the machine such that the bucket attachment can be hydraulically controlled. The bucket head may include one or more hydraulic cylinders. The or each hydraulic cylinder may be controlled by being connected to the hydraulic connection points of the body and or chassis of the machine and the hydraulic system can activate the hydraulic cylinders so that the bucket head can be moved up and down, as instructed by the control means.

Preferably, the bucket attachment includes a bucket head. Preferably, the bucket head is attached to one or more arms. Preferably, the bucket head is attached to two arms. Preferably, the or each arm includes one or more connection point which correspond to one or more attachment point on the body and or chassis of the machine, wherein the bucket attachment is attachable to the machine by connecting one or more connection point of the or each arm to one or more attachment point on the body and or chassis. Preferably, the or each connection point of the or each arm is substantially U-shaped and adapted to slide over a reciprocating attachment point of the body or chassis of the machine, each side of the U- shaped part of the connection point of the bucket attachment, and the reciprocating attachment point of the body or chassis of the machine including a hole through which a bolt or similar can be passed to secure the bucket attachment to the machine. Alternatively, the or each connection point of the bucket attachment and the or each attachment point of the machine, may both be metal loops through which a bolt pin or D-clamp can be passed to secure the bucket attachment to the body and or chassis of the machine.

The bucket attachment may take any suitable form. Preferably, the bucket attachment is made substantially of steel. Preferably, the bucket head has a maximum height of substantially 200 millimetres. Preferably, the bucket head has a maximum width of substantially 700 millimetres.

Preferably, the bucket attachment is hydraulically controlled. Preferably, the bucket attachment is connected to hydraulic connection points on the machine to connect to the hydraulic system. The bucket attachment may include one or more hydraulic cylinder. Preferably, the hydraulic cylinder includes a pair of hydraulic cylinders, one mounted on each of a pair of arms. The or each hydraulic cylinder is, preferably, controlled by the hydraulic system to enable the bucket to be moved up or down. Preferably, the bucket head can be controlled by remote control.

The or each tool attachment may include or be a fire cannon attachment for firing water. The firing of water may be to wash down an area, to blast away material or to put out fires. Alternatively, the fire cannon attachment may be used to burn material. In this form of the invention, a fuel tank and ignition are included to create the fire. Preferably, the fire cannon attachment includes a head and a neck and the head and neck can be moved up and down, or left and right to direct the flow of water. Preferably, the moving of the fire cannon is hydraulically controlled. Preferably, the movement of the fire cannon is controlled by remote control. Preferably, the fire cannon attachment is connectab!e to a hydraulic system. Preferably, the fire cannon attachment is connectable to hydraulic connection points of the body and or chassis of the machine such that the fire cannon attachment can be hydraulically controlled. Wafer may be supplied directly through an attached hose to the fire cannon attachment. Preferably, a hose or pipe is included in the machine, adapted to pass through the machine to supply water to the or each tool attachment. Most preferably, a pipe passes through a hydraulic tank of the machine. Preferably, the pipe is adapted for receipt of a hose to carry water therethrough. Preferably, the water passing through the pipe has a cooling action on the hydraulic fluid. Preferably, the pipe provides a water connection point on the body or chassis of the machine. Preferably, the front of the body includes a water connection point attachable to a tool attachment. Preferably, a water supply is connected to one end of the hose so that water can pass through the pipe, through the hydraulics tank and a fool attachment is connected to the water connection point so that water can be used by the tool attachment. Alternatively, a supply of water may be carried by the machine. The supply of water may be remotely controlled or directly controlled by operation of a tap, for example. Preferably, the supply of water is controlled by an electric valve. Preferably, the control means controls the electric valve and the flow of water to the fire cannon attachment. The electric valve may be controlled remotely. Preferably, the fire cannon attachment includes a water connection point and the water connection point is connectable to the water connection point on the front of the body of the machine such that water is supplied to the fire cannon attachment for use to clear material. Preferably, the water supply and hydraulic controls of the fire cannon attachment can all be controlled remotely. Preferably, the fire cannon attachment is made substantially of steel. Preferably, the fire cannon attachment has a maximum height of substantially 400 millimetres.

The body and or chassis of the machine may include a plurality of attachment points and some attachment points may be used to attach one tool attachment and other attachment points may be used to attach a different tool attachment to the machine. There may be some attachment points that are used to attach all the tool attachments, whereas some other attachment points may be used only to attach to a specific tool attachment.

In one preferred form of the invention, the hydraulic tank includes a pipe which runs substantially from the back of the hydraulic tank to the front. Preferably, the pipe runs from substantially the back of the machine to the front of the machine. Preferably, the pipe is adapted to receive a hose for providing a water supply to the machine. The water supply may be connected to a fool attachment for provision of water to the tool attachment. Preferably, the control means includes an electric valve for controlling the supply of water from the hose to the tool attachment. Preferably, operation of the electric valve enables the water supply to be turned on or off as required. Preferably, the water supply is remotely controlled. Preferably, the electric valve is remotely controlled to control the flow of water to the tool attachment. Preferably, the hose is a retractable or extendible hose that can retract or extend with the forward or backward movement of the machine.

Alternatively, the pipe may be adapted to receive a hose for providing suction to the machine for removal of material. The suction may be supplied by a suitable suction machine attached to the suction hose. The suction hose may be connected to the tool attachment for provision of suction to the tool attachment for removal of material. The control means may include means to control the supply of suction to the machine. The supply of suction to the tool attachment may be controlled by the control means. The supply of suction may be remotely controlled. Preferably, the suction hose is a retractable or extendible hose that can retract or extend with the forward or backward movement of the machine.

In a preferred form of the invention, the pipe is adapted to receive a hose for providing a water supply to the machine and the pipe is also adapted for receiving a suction hose for removing material. Either the water hose or the suction hose may be used. In an alternative preferred form of the invention, both the water hose and the suction hose may be received at the same time, within the pipe.

Alternatively, the pipe may be adapted to receive a hose through which air is blown, under-pressure, and the air can be used to clear material. In this form of the invention the tool attachment may include means to direct the flow of air for clearing of material.

Preferably, water and or suction can be supplied to the blade attachment, bucket attachment or fire cannon, or other tool attachment when attached to the machine, to assist to clear material. Also, water or suction can be supplied to the machine when in use without a tool attachment. In this form of the invention water or suction is supplied in a simple hose form.

Preferably, the machine is remotely controlled. Preferably, the control means includes a remote control means and the machine can be entirely controlled by remote control means. Preferably, the power supply and hydraulic pump are remotely controlled. Preferably, operation of the remote control can enable power to be supplied from the power supply to the hydraulic pump, and also provide an electrical charge to the hydraulic valves, whereby, the hydraulic valves drive the drive motors. In this form of the invention, preferably the drive motors can drive one or both of the drive sprockets forward or back, together with the associated belt, second sprocket and wheels, moving the machine forward or back. Preferably, the bucket attachment can be moved up or down hydraulically, by remote control. Preferably, the blade attachment can be tilted hydraulically, by remote control. Preferably, the fire cannon attachment can be moved left or right or up or down, by hydraulic operation, controlled by remote control. Preferably, the operation of a water supply to the tool attachments can be controlled remotely. Preferably, the operation of the suction hose for the fool attachment can be controlled remotely. Where the invention includes an air blower, the air blower may be remotely controlled.

Preferably, the remote control includes a remote control unit and a remote receiver. Preferably, on response to radio signals received from the remote control unit the radio receiver converts the signals to electrical signals for controlling the machine. Preferably, the receiver sends an electrical signal to a solenoid associated with a hydraulic control valve for controlling the flow of hydraulic fluid. The solenoid may, in response to an electric signal as controlled by the remote control unit, allow flow of hydraulic fluid to the drive motors. Or the solenoid, in response to other signals from the remote control unit, may allow flow of hydraulic fluid to the tool attachment.

The machine may be operated by enabling the power source to provide power to the hydraulic pump, which pumps hydraulic fluid from the hydraulic tank to the hydraulic control valve to maintain a set pressure, a solenoid associated with the hydraulic control valve is controlled by the operator to select where flow of hydraulic fluid is to be directed. Power may also be supplied to a fan to cool the motor. The flow may be directed to drive motors to drive the machine forward or back, or steer left or right by use of the "skid steer" operation, The flow may be directed to an attached tool attachment to control movement of the tool attachment. Preferably, a delay timer relay is included. Preferably, a signal from the remote control unit causes an electrical signal to be sent to the delay timer relay. Preferably, the delayed timer relay, in response to the electrical signal received, sends an electrical signal to activate the hydraulic pump. Preferably, the electrical signal is sent to a relay which in turn activates the hydraulic pump, powered by the power source. Preferably, the delay timer relay continues to send a signal that power should be supplied to the hydraulic pump motor for a set period after the signal ceases or has been lost. Preferably, on activation of the remote control a radio signal is sent to the radio receiver which in turn sends an electrical signal to a delay timer relay which maintains the signal to provide power to the hydraulic pump while the signal is being sent from the remote control and for a set time after the signal has ceased or been lost.

Preferably, the or each solenoid valve is controlled by an electrical signal received from the radio receiver in response to a radio signal sent by the remote control. Preferably, the electrical signal control moves the core or central coil of the solenoid such that fluid can flow to one end or the other directing flow of hydraulic fluid to drive the machine or to control the tool attachment.

Preferably, the remote control sends a radio signal to the radio receiver which in turn sends an electrical signal to a travel alarm. The travel alarm may take any suitable form. Preferably, the travel alarm includes a flashing light to alert people that the machine is in use. The travel alarm may include a siren or similar audible warning that the machine is in use. Preferably, the signal to the travel alarm is continuous while the machine is in use. It is highly preferred that the machine be entirely remotely controlled. Alternately, the machine may be directly controlled by a control panel attached to the machine by a cable. Preferably, in this form of the invention the cable is of sufficient length to enable the user to stand at a safe distance, while observing and using the machine.

Preferably, one or more light is included. Preferably, a pair of lights is included at the front of the machine. Preferably, one or more light is included at the rear of the machine. The one or more light may be powered by the power source. The one or more light may include their own power source, such as a battery. Preferably, the or each light is powered by the one or more battery of the machine and power is supplied to the or each light when the machine is in operation. Preferably, one or more warning light is included. Preferably, the or each warning light is turned on while the machine is in operation. Preferably, the machine includes a remote control means including a remote control unit and a radio receiver and when the radio receiver of the remote control means receives a signal from the remote control unit, a signal is sent to the or each warning light and the or each warning light is turned on. The lights may take any suitable form. The lights may be a light emitting diode array, conventional bulb or similar. Preferably, one or more camera is included to relay pictures to the operator. The pictures may be a view to the front, back or either side of the machine or may be a 360 degree view provided by a spherical camera. Preferably, the or each camera is used to assist the remote control of the machine. Preferably, the or each camera is powered by the power source. Preferably, the or each camera provides pictures to the user so that the user can operate the machine remotely. Preferably, the cameras are controlled by remote control. Preferably, there are a pair of cameras, one on either side of the machine. Preferably, the direction in which the or each camera points is controllable. Preferably, the direction the or each camera points may be changed to enable the camera to point forward or back or to the side. Preferably, the movement of the or each camera can be controlled remotely. Preferably, the cameras are part of a wireless system, whereby pictures are transmitted to a screen, visible to the operator to enable operation of the machine. The cameras may include means to wash the lenses so as to remove dirt and debris that may obscure the view. The lenses may be washable by remote control.

Accordingly, the present invention also provides a machine for clearing material, the machine including: a chassis] a body, connected to the chassis; drive means for driving the machine; control means, for controlling the driving of the machine, including a hydraulic system and a remote control means; and a power supply for providing power to the drive means and control means, wherein, in use, a too! attachment can be attached to the body and or chassis of the machine, the tool attachment being adapted to clear and or collect material, and the machine is operational remotely by use of the remote control means to control the hydraulic system and the drive means, and the machine has a maximum height of approximately 400 millimetres.

INDUSTRIAL APPLICABILITY

The material clearing machine is an extremely useful machine manufactured for sale for use in the mining industry and otherwise. Use of the materia! clearing machine saves time and money, for example, by removing the need to stop conveyors or other mine works in order that debris can be cleared away. BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in connection with a non-limiting preferred embodiment with reference to the accompanying drawings, in which: Figure 1 is a perspective front view of a material clearing machine according to a preferred embodiment of the invention, with a fire cannon attached at the front;

Figure 1A is a perspective rear view of the materia! clearing machine and attached fire cannon attached of Figure 1 ; Figure 2 is front view of the material clearing machine of Figures 1 and 1 A, with the fire cannon removed;

Figure 3 is a rear view of the materia! clearing machine of Figures 1 , 1 A and

Figure 4 is side view of the material clearing machine and attached fire cannon of Figures 1 and 1A;

Figure 5 is a side view of the fire cannon Figures 1 , 1 A and 4 removed from the materia! clearing machine;

Figure 8 is a top view of the fire cannon of Figure 5;

Figure 7 is side view of a blade attachment for use with the material clearing machine of Figures 1 , 1 A and 2 to 4;

Figure 8 is a top view of the blade attachment of Figure 7;

Figure 9 is side view of a bucket attachment for use with the material clearing machine of Figures 1 , 1 A, and 2 to 4;

Figure 10 is a top view of the bucket attachment of Figure 9; Figure 11 is a schematic circuit diagram illustrating the workings of the machine of Figures 1 , 1 A and 2 to 4;

Figure 12 is a detailed schematic diagram of the workings of the hydraulic valves of Figure 11 ; and Figure 13 is schematic diagram of the workings of the fire cannon of Figures 1, 1 , 1 A, 5 and 6.

DETAILED DESCRIPTION OF THE INVENTION INCLUDING A BEST MODE

Referring to Figures 1 , 1A and 2 to 13, a preferred embodiment of the invention will be described, where material clearing machine 1 has chassis 10 and body 12, body 12 having front plate 14. Chassis 10 is shown welded to body 12, however, bolts or other forms of attachment could be used, in alternative embodiments. Body 12 is formed of steel, as is much of chassis 10. Front plate 14 of body 12, is also made of steel, and is configured to enable attaching of the working part of machine 10, used for clearing material, as described in more detail below, referring to Figures 5 to 10.

Turning to Figures 1 , 1 A, 2 to 4, and 11 and 12, in particular, chassis 10 can be seen to be a monolithic chassis including a pair of drive sprockets 16 and 17 (not labelled or visible in the drawings), first pair of wheels 18 and 19 (not labelled or visible in the drawings), second pair of wheels 20 and 21 (not labelled or visible in the drawings), third pair of wheels 22 and 23 (not labelled or visible in the drawings), and pair of sprockets 24 and 25 (not labelled or visible in the drawings). There are also two belts 26 and 28 one on either side of chassis 10 each surrounding half of the pairs of sprockets and wheels. Each belt 26 and 28 and the surrounded sprockets and wheels create "tracks" which can carry machine 1 over the ground. Drive sprockets 16 and 17 and sprockets 24 and 25 are all made of steel but any suitable metal or strong material may be used. Wheels 18, 19, 20, 21 , 22, 23 are all metal rollers. Alternatively, wheels 18 to 23, inclusive may include a rubber tyre or be made of other sturdy materials or combinations of materials.

Belts 26 and 28 have cut-outs 30 into which catch the reciprocating engagement spikes 32, of drive sprockets 16 and 17, and the engagement spikes (not labelled) of sprockets 24 and 25. Rotation of drive sprocket 16 and 17 pulls belt 26 and 28 forward or back with the rotation. Belts 26 and 28 also have protuberances or knobbles 34 on the outside to create an all- terrain tread suitable for use of machine 1 in a mine or other industrial environment. Machine 1 is designed to readily travel over soft ground, hard ground and uneven terrain as is required. Belts 26 and 28, projections 30 and knobbles 34 are all made of a strong rubber material suitable for forming the tracks. The particular form and shape of the cut-outs 30 may be varied to suit the shape of engagement spikes 32, and similarly the shape and form of the knobbles may be varied to suit the tread requirements.

Drive motors 36 and 38 (refer Figure 3), are adapted to drive sprockets 16 and 17, which in turn is translated to backward or forward movement of belt 26 or 28, respectively. Drive motors 36 and 38 can be driven forward or back in response to remote controls (not shown). Bar 39 provides support for drive motors 36 and 38. Forward movement of a pair of paddles of the remote control (neither of which are shown) moves both drive motors 36 and 38 forward, moving drive sprockets 16 and 17, and belts 26 and 28 forward, and so machine 1 moves forward. Likewise movement of the pair of paddles backwards moves drive motors 36 and 38 backwards, together with drive sprockets 16 and 17, and belts 26 and 28, and so machine 1 moves backwards. The forward or backward movement is translated to the forward or backward movement of machine 1 by rotation of drive sprockets 16 and 17 about axles 40 and 42 (not labelled). Engagement spikes 32 of drive sprockets 16 and 17 engage in cut-outs 30 of belts 26 and 28 so that as sprockets 16 and 17 are driven forward or back, belts 26 and 28 also move forward or back, accordingly. Wheels 18, 19, 20, 21 , 22 and 23 rotate about their respective axles 44, 46, 48, 50, 52 and 54 (46, 50 and 54 on the left hand side not shown) in response to the movement of belt 26 and 28, as do sprockets 24 and 25 about axle 56 and 58 (not labelled). Sprockets 24 and 25 assist to hold belt 26 and 28 on chassis 10 and with the translation of the movement forward and back. Wheels 18, 19, 20, 21 , 22 and 23 all rotate in response to the movement of belts 26 and 28 between drive sprockets 16 and 17 and sprockets 24 and 25. Drive motors 36 and 38 can include one or more fan, mounted on the drive motors 36 and 38 to keep them cool during operation.

Machine 1 has no steering wheel and the wheels 18, 19, 20, 21 , 22 and 23 cannot be directed, therefore machine 1 is steered using the "skid steer operation". Other suitable alternative steering method could alternatively be used. The skid steer operation is achieved by use of the pair of paddles. Pushing both paddles forward drives machine 1 forward by powering both drive motors forward; pulling both paddles backwards reverses machine 1. To steer, by moving only the right paddle of the remote control forward drives drive sprocket 16 of the right-hand side to a greater extent than drive sprocket 17. The right-hand track is driven forward while the left-hand track remains stationary, which steers machine 1 to the left. Use of the left paddle enables the left hand track to be controlled and machine 1 can be steered to the right. A skid steer controlled track system can rotate on a point and so has a very small turning circle. The highly manoeuvrable skid steer controlled track system is particularly useful in the confined space of an underground mine where there may be many vehicles, equipment, conveyors and other obstacles which must be navigated in order for the machine to be moved to its destination.

Chassis 10 includes side panels 59, one for each track, on either side of chassis 10. Side panels 59 provide protection to chassis 10 and prevent material, such as coal or coal dust, entering and blocking the movement forward and back of belts 26 and 28, which may slow or stop the tracks. Side panels 59 include cut-outs 60 for receipt of axle 44 and 48. Side panels 59 also include windows 62 to enable access to the inside of chassis 10. Windows 62, in particular, enable adjustment to the track such as to tighten belt 26 or 28, as appropriate. Bolt 63, one on either side of chassis 10, allows for oscillation between the last two wheels 20 and 22 of the right- hand side, or wheels 21 and 23 of the left-hand side, when machine 1 is travelling. Fire cannon 64 is illustrated attached in Figures 1 , 1A and 4, as described further below.

Drive motors 36 and 38 are driven using a hydraulic system as this is a cost efficient and low maintenance method of powering machine 1.

Referring to Figures 1 1 and 12 in particular, the electrical circuits and hydraulic system of machine 1 are illustrated. The hydraulics system includes a hydraulic pump, valves and hoses, attached to a tank of hydraulic fluid. Under the length of body 12 is the tank for hydraulic fluid (not illustrated). The positioning of the hydraulic tank assists to enable machine 1 to have such a low height and small size overall. A front section of body 12 contains two batteries (not illustrated) and a middle section of body 12 contains the hydraulic pump and hydraulic valves, with associated hoses. The hydraulic pump is submerged into the hydraulic tank, and the hydraulic valves (not illustrated) are recessed into the hydraulic tank, to enable the machine to have a dramatically reduced height, overall. The isolation of the various components is important in reducing the risk of an internal fire. The particular arrangement of the batteries, electrics, hydraulic tank, pipe, hydraulic pump and hydraulic valves is extremely beneficial but alternative arrangements may be used

A rear section of body 12 contains the electrics (partially schematically illustrated in Figure 1 1 ) and other parts of the machine. Figure 1 1 illustrates the electrical circuits of the machine, schematically labelled; remote control unit 65a, connected drive motor with attached fan 65b, front washer 65c, rear washer 65d, flashing light 65e, timed relay 65f, relay 65g, pump isolator 65h, main isolator 65i, charge receptacle 65], batteries 65k, 300 AMP auto reset circuit breaker 651, fuse 65rn, right front iight 65n, left front light 65o, right rear Iight 65p,left rear Iight 65q, backup alarm 65r, water solenoid valve 65s and valve group 65t. As will be clear to a person skilled in the art the diagram shows the wiring necessary to control the various parts of machine 1 including valve group 65t, Valve group 65t is illustrated in greater detail in Figure 12 including main relief valve 65u, pressure relief valve 65v and test point 65w. The workings of machine 1 are described further below, In use, the hydraulic tank is filled with a suitable hydraulic fluid such as glycol which is fire resistant. Alternative fluids include petroleum based hydraulic fluids, such as DEXTRON (Trade mark) ill transmission fluid, or similar, and connected directly to the hydraulic pump. When power is provided to the motor of the hydraulic pump from the batteries, hydraulic fluid is pumped to the hydraulic valves via a pipe or hose. The motor of the hydraulic pump creates flow of hydraulic fluid to the main hydraulic control valve and the set pressure is maintained, and a drop in pressure is set to accommodate the pilot oil for the associated solenoid valve. When an electrical signal (see below) is received it moves the solenoid valve so that it allows pilot oil to flow to either one end or the other of the main spool and this in turn allows main oil flow to the tool attachment or to one of drive motors 36 or 38, to power the tool attachment or move machine 1 , as described above. Oil returning from drive motor 36 or 38 is directed back to the hydraulic tank through the valve, via a filter. The main control valve may direct the hydraulic fluid and hence the hydraulic force to one of the drive motors 36 or 38, or another. Hydraulic force can be directed through hoses to drive either drive sprocket 16 or 17 either forward or back to drive machine 1 forward or back. Use of drive sprocket 16 on the right-hand side only, or to a lesser degree, enables machine 1 to be steered left, or vice versa if power is supplied to a greater degree to the left-hand side the machine 1 turns right. On a different control signal the hydraulic main control valve may direct hydraulic force to the tool attachment, as described below.

The hydraulic valves are controlled remotely in the illustrated example but could equally be controlled by a wired controller or directly on machine 1 , in other forms other invention. Remote control of the machine is particularly beneficial for safety reasons as the user can remain a safe distance from the work site or be in a protective control centre, and operate machine 1. The remote control is operated by a person, usually at a safe distance, such as in a control room or well away from the conveyor or other equipment where material needs to be cleared. Operation by a person of the remote control creates an electrical signal in the remote control unit which in turn is converted to a radio signal which is sent to a radio receiver of machine 1 . The radio receiver of machine 1 on receipt of the radio signal from the operator, converts the radio signal to an electrical signal, this electrical signal being transferred to the solenoid valve mounted on the top of the control valve. The signals supplied consist of a constant 24 volt DC, an earth signal and a varying voltage with 12 volt DC being neutral and 0-12 volts DC being one-way and 12 volts DC-24 volts DC being the opposite direction.

When a signal is received by the remote control from the operator a voltage is also sent to a travel alarm and to a delay timer relay (refer to Figure 1 1 and below). The electrical signal to the travel alarm powers a flashing warning light to indicate machine 1 is in operation. Power is supplied by the two batteries at 24 volts DC, via an isolator to a relay. The relay receives a signal voltage from the programmable delay timer relay that receives its power from the remote control unit. When the relay is in the closed position the relay supplies 24 volts DC to the motor of the hydraulic pump, whereby hydraulic flow is created. When the signal from the remote control ceases or is lost the delay timer relay maintains power to the hydraulic pump and keeps the motor of the hydraulic pump running for a set period of time, after the signal has stopped. The reason for this is to prevent there being a delay if a further remote instruction is subsequently sent, as would occur if the motor for the hydraulic pump ceased immediately. If, after the set time period has elapsed, no further input signal is received from the remote control, the delay timer relay will switch off, cutting power to the motor for the hydraulic pump, which is hence also switched off. If, an input signal is received from the remote control within the set time period the delay timer relay will reset itself, and operate the motor of the hydraulic pump, until there is again a loss of remote signal. When the signal is lost for a greater time period than that set on the delay timer relay the machine will put itself into standby mode, cancelling any current operations until such time as machine 1 receives a signal from the controller that a function has been requested, when the pump is restarted allowing the function to be completed. If no signal is received for a set period of time, for example, 5 minutes, machine 1 will enter standby mode, to save battery power. To resume operation of machine 1 a reset or start button must be pressed which will activate machine 1 and causes a horn (not illustrated) to blast to alert people that machine 1 is operational. Referring in particular to Figures 5, 6 and 13, fire cannon 64 is shown attachable to front plate 14, as can also be seen in Figure 1 and 1A. Fire cannon 64 is for use to clear material by blasting with water or washing areas down, such as to remove coal dust. In an emergency situation fire cannon 64 can also be used to direct water to put out small fires. Front plate 14 has connection points 66 for the hydraulic control system contained within body 12. Each of connection points 66 is attached internally to a hose and valve of the hydraulic system whereby activation of a particular hydraulic valve will cause hydraulic force to extend down the particular connection point 66. Fire cannon 64 is controllable by connecting hydraulic hoses 68 and 70 to, as illustrated, the two lowest connection points 68 such that operation of the appropriate hydraulic valves can rotate cannon head 72 on neck 73 up or down to direct the flow of water (refer Figure 13). For example, if hydraulic force is provided to hose 68, neck 73 lowers and if hydraulic pressure is provided to hose 70, instead, neck 73 is raised. In this way head 72 of fire cannon 64 can be precisely aimed for use to direct water where it is desired. Figure 13 illustrates schematically the circuit and valve arrangement for the hydraulic control of fire hose 64. Water is provided from a hose (not shown) that passes through pipe 74, pipe 74 being adapted to pass through the hydraulic tank, to save on space and height of machine 1. Also, as pipe 74 passes through the hydraulic tank the water acts to cool the hydraulic fluid contained therein. A water supply is provided through the hose, through pipe 74, so as to be accessible at front plate 14. Water can be further provided to fire cannon 64 by attaching the hose extending from pipe 74 in front plate 14 to water tank 75 by screw connection 76 of fire cannon 64. Fire cannon 64 can be used for high pressure water blasting if the water is supplied with sufficient pressure. Alternatively, abrasive blasting may be used, if required. The direction of the water blast can be directed by directing cannon head 72 and cannon neck 73 by use of the hydraulic system and hydraulic connection 66 and 68. The hose is attached to a tank of water or the tap of a fixed water supply, as appropriate. In the illustrated example a long hose is used, operable by the user at a distance, turned on and off to enable the water to flow or not, as required. The hose is connected to an electrically controlled valve (refer Figure 13), fitted to the rear of machine 1. The electric valve is controlled remotely to turn water off or on, as required. Alternatively, the electric valve may be manually controlled. Use of fire cannon 64 is incredibly effective at clearing material and blockages of material through use of the pressurised water.

Front plate 14 of body 12 includes various attachment points 77 for attaching work equipment to machine 1. The position of attachment points 77 as illustrated can be seen be one towards the top of the middle of front plate 14 and two towards the bottom of front plate 14, one on either side. The positions and number of attachment points 77 can be readily varied to suit the tool attachment to be attached to front plate 14. Fire cannon 64 is attached to front plate 14 by being bolted to one of the lower attachment points 77.

Blade attachment 78 of Figures 7 and 8 is a useful attachment, used to push or scrape material out of the way. Material such as coal, may collect under a conveyor belt, machine or vehicle and blade attachment 78 can be used to push or scrape the material to where it can be picked up and collected. Blade attachment 78 has two arms 80 and 82 each arm having a U-shaped end 83. To attach blade attachment 78 to front plate 14 of body 12 each U-shaped end 83 is fitted over or around the two lower attachment points 77. Each of the sides of the "U" of the U-shaped end 83 and attachment point 77 having a hole through which a bolt pin or D-clamp (not shown) can be fixed to hold ends 83 and attachment points 77 together. Blade head 84 of blade attachment 78 is shaped to scrape material from dose to the ground. Attachment point 85 is included which may be used to chain or otherwise secure blade attachment 78 to machine 1 . Attachment point 85 may be chained to any one of attachment points 77 of front plate 14. Blade head 84 is attached to arms 80 and 82, arms 80 and 83 being braced by strut 86. Strut 86 provides a mounting point for hydraulic cylinder 106, connected to the top of the front plate of blade head 84, enabling operation of blade attachment 78. Blade attachment 78 is controlled by the hydraulics system by use of hydraulic cylinder in response to remote control of the hydraulic valves, as described elsewhere. Activation of the hydraulics system enables angling of blade head 84 by strut 86 as appropriate to clearing of the material.

Bucket attachment 88 is illustrated in Figures 9 and 10, and has bucket head 90, arms 92 and 94 with strut 95 between them. Hydraulic lifting mechanism 96 is included, having hydraulic cylinders 97 one for each of arms 92 and 94. On connection with hydraulic connection points 68, hydraulic cylinders 97 can move bucket head 90 up or down in response to the changes in hydraulic force. In this way material can be scooped up and carried to another location, where the material can be dumped.

Arms 92 and 94, of bucket attachment 88, have a U-shaped ends 98. To attach bucket attachment 88 to front plate 14 of body 12 each U-shaped end 98 is fitted over or around the two lower attachment points 77. Each of the sides of the "U" of the U-shaped end 98 and attachment point 77 having a hole through which a bolt pin or D-clamp (not shown) can be fixed to hold ends 98 and attachment points 77 together. Attachment point 106 enables bucket attachment to be secured, such as by a chain to one or more attachment points 77, on front plate 14.

Pipe 74 can be used for a hose to supply to water not only to fire cannon attachment 64 but to any tool attachment or work equipment attached. A hose on the work equipment can quickly be utilised such as on blade attachment 78 whereby water may be blasted in front of blade head 84, for example. Similarly, where bucket attachment 88 is used water provided through pipe 74 from a hose may be used to provide water to bucket head 90. Water may be provided separate to any work equipment attached to machine 1 and may be used for machine 1 itself.

It is most advantageous to have pipe 74 passing through the hydraulic tank, as the hydraulic fluid is cooled by the water as the water is used by the tool attachment.

Alternatively, pipe 74 may receive a hose attached to a means of creating suction whereby material including dust, dirt or debris, or water or other liquid may be removed through the hose through pipe 74. Suction may be used with blade attachment 78, bucket attachment 88, or machine 1 used without any attachment just as a hose, as required. The batteries used are rechargeable batteries of a suitable kind for use in industrial machines. Other types of batteries may be used, or in an alternative form of the invention machine 1 may be mains powered, supplied through a cable. The batteries can be charged by driving machine 1 into a reciprocating recharge point (not shown) where the batteries automatically starts to recharge, without the need for the user to do anything more. To recharge the two batteries the machine is driven into a docking station so that the batteries connect to the charging power supply, with no need for human intervention. Battery connector 99 as can be seen in Figure 3, is a two pole connector that mates with a reciprocating connector of the docking station or recharge point (not shown) whereby electrical charge can be provided to charge the two batteries. When the two batteries are fully charged the charger recognises this and turns itself off. The two batteries are kept fully charged so that machine 1 is ready to operate at any time it is needed, by simply being driven out of the docking station again and goes to work where it is required to clear material. During operation a return voltage is sent, via the wireless network used by camera 100, to the operator so that the operator can monitor the state of charge of the batteries and when machine 1 need be driven back to the docking station for charging.

Body 12 includes warning light 102 and side lights 104 at each side of the rear and front of body 12. A travel alarm is activated by the remote control, when any movement is actuated; this signal also starts the hydraulic pump. Flashing warning light 102 mounted at the rear of machine 1 and is activated when the remote receiver is activated and stays activated until machine 1 enters standby mode or is deactivated. As illustrated lights 104 are powerful bright lights to enable machine 1 to be seen and to illuminate machine 1 to facilitate the clearing of material. Due to its very small dimensions machine 1 may be difficult to see and so good lights and warning lights are important. Also for this reason body 12 and parts of chassis 10 are painted brightly to increase visibility. Reflective or other materials or paints could also be used for body 12 and or chassis 10 so that machine 1 can easily be seen in the dangerous environment of a mine, for example. Body 12, and chassis 10 has been especially adapted to enable machine 1 to have very small dimensions allowing a massive improvement over the existing means of clearing material, such as use of small digging machines or workers with a shovel. Machine 1 is very small overall, having a height of approximately 400 millimetres, a length of approximately 1000 millimetres (without any attachment) and a width of approximately 700 millimetres, making machine 1 more manoeuvrable and generally useful in the mining environment in particular under and around conveyors for coal or mineral ores. Machine 1 can be made so small due to several new developments, including the hydraulic tank being formed in the bottom of body 12 and pipe 74 passing through the hydraulic tank, and the hydraulic pump being submerged therein, and the hydraulic valves recessed into the hydraulic tank. As the hydraulic system is sunk into the body and hydraulic tank the overall height is much reduced. The hydraulic pump has a fan (not shown) mounted on top for cooling. Also pipe 74 is important for provision of water or suction to the tool attachments of the machine, but pipe 74 would take up additional space, if it was not positioned as in the described embodiment, through the hydraulic tank. It is a significant development that pipe 74 for the water or suction hose passes through the hydraulic tank, significantly reducing the height of machine 1 , and acting to cool the hydraulic fluid as the water flows through pipe 74. Machine 1 stands less than 400 millimetres high, only just taller than a standard ruler. The very low height of machine 1 allows machine 1 to be able to be driven under machinery, vehicles and conveyors, even those less than half a metre from the ground and clear away material that may have accumulated. There is a significant benefit to the newly developed machine, and due to its ingenious design features to reduce the height, enables the machine to vastly improve material clearing efficiency. The low machine enables mines to be more efficient and increase production due to reduced stoppage time and improved collection and clearing of spilled material. It will be apparent to a person skilled in the art that changes may be made to the embodiment disclosed herein without departing from the spirit and scope of the invention in its various aspects.