In particular, it is envisaged that the dismantable mixing apparatus will be used in situations where a dismantable mixing apparatus is preferable over traditional non-dismantable mixing apparatus. Such situations can include the requirement of ready transport of the mixing apparatus in a variety of vehicles, storage where there is limited space, assembly on site as required, and the need for ready replacement of individual worn or damaged parts.

It is envisaged that the dismantable mixing apparatus will be most commonly used to mix concrete.

However, the dismantable mixing apparatus may have applications outside this field, including mixing of a variety of materials, such as grains, food ingredients, fertilisers and so forth.

BACKGROUND ART For ease of reference, the dismantable mixing apparatus shall now be referred to as a dismantable concrete mixer, although it should be appreciated that use of this term is not to be seen as limiting.

A range of concrete mixers have been known, or are currently available.

For ease of reference, the dismantable mixing apparatus shall now be referred to as a dismantable concrete mixer, although it should be appreciated that use of this term is not to be seen as limiting.

This range includes concrete mixers of the type that may be manually operated.

In this type of concrete mixer, the drum portion may lie horizontally with respect to the ground and may be rolled along the ground to facilitate mixing of concrete within the drum (as in New Zealand Patent Specification Nos. 216488 and 237848). Other types of manual concrete mixers may have the drum incorporated into a stand. A handle may be used for turning the drum manually (as in New Zealand Patent Specification Nos. 88976,89579, and 118459).

Yet other concrete mixers may be powered by a motor or other driving means.

For example, some are mounted on a vehicle, to enable the mixed or mixing concrete to be transported to a site at a distance from the raw materials.

Typically, the concrete mixer is driven by the vehicle's engine. New Zealand Patent Specification Nos. 208979,213947, and 121551 relate to concrete mixers mounted on a truck; while concrete mixers of New Zealand Patent Nos. 135352, 152657,132753, and 112651 may be fitted to a tractor and are driven via the tractor power linkage.

Still other concrete mixers incorporate motor driven rotating belts. These rotating belts may convey mixed concrete from the concrete mixer onto a conveyor belt (as in New Zealand Patent Nos. 120917 and 208717). Others use the belts to contribute to mixing, as in New Zealand Patent No. 119214. Yet others rely on the belts as a form of runway, whereby the drum of the mixer is required to be rolled up and down the runway in order for the contents of the drum to be mixed (as in New Zealand Patent No. 129052).

A further type of concrete mixer may incorporate an inner and outer chamber, as opposed to a single drum. The inner chamber (or liner) may contain a rotar which mixes the concrete (as in New Zealand Patent No. 214599).

Some concrete mixers are designed essentially like a domestic food mixer. These types of concrete mixers typically have a stationary bowl with a rotating mixing device which is either lowered into the bowl (as in New Zealand Patent Specification No. 138194), or is incorporated into the interior of the bowl (as in New Zealand Patent Nos. 129999,107128, and 103717). Another variation of this type of mixer may include a trough or drum with a mixing worm incorporated into the trough or drum (as in New Zealand Patent No. 128984 and 119541).

Lastly, many individual home handy persons and contractors are familiar with the type of concrete mixers that have a drum which is capable of rotating, mounted onto a frame and connected to a motor. The drum may be capable of pivoting with respect to the frame to enable the drum to be emptied (as in New Zealand Patent Specification Nos. 193154,108765,138458, and 90249).

However, a number of problems exist with the foregoing types of concrete mixers.

For concrete mixers which essentially consist of a drum which is rolled along the ground in order to mix the contents of the drum, there may be problems where the ground is an uneven surface, or is muddy or soft, which can be typical of a building site. Accordingly, such mixers may be limited to use on firm, solid, and dry surfaces.

Further, the use of such concrete mixers is time consuming and labour intensive.

A person using such a mixer would be unable to do anything other than push the concrete mixing drum around until the concrete is mixed.

Similar problems exist where the concrete mixer is positioned on a stand and the person operating the mixer is required to manually rotate a handle, in order for the contents of the drum of the mixer to be mixed.

Concrete mixers which are mounted on a vehicle are also problematic. Typically, these mixers are large and permanently mounted to the deck of a vehicle.

Ownership of such concrete mixers would be out of the realm of the average person because of not only the cost of the mixer, but the vehicle also.

Similar problems exist with tractor driven concrete mixers. The average person who wishes to use a concrete mixer frequently does not own a truck or tractor required to drive such concrete mixers. Accordingly, without the vehicle, these concrete mixers are not a practical option.

Similarly, concrete mixers that incorporate rotating belts to mix and/or convey mixed concrete, are also typically not designed to be used by the average person.

Such concrete mixers are typically cumbersome, occupy a relatively large area and are not generally mobile.

With concrete mixers that are essentially like a domestic food mixer, incorporating a stationary bowl and a rotating mixing device, additional problems may arise because of the moving components. If residual concrete remains inside the drum, a portion of that concrete may harden onto the rotating mixing device, thereby reducing the efficiency, or useable life of the mixer. These mixing devices are better suited to mixing other products, such as grains, foodstuffs and powdered fertilisers, as opposed to concrete.

Lastly, the range of concrete mixers typically used by contractors and home handy people which incorporate a frame mounted, rotating drum which can be tipped forward for emptying, also have inherent problems associated with their use.

Such concrete mixers are typically cumbersome, heavy and occupy a substantial area when in use, and when stored. While some models incorporate wheels into the frame, the weight of such concrete mixers typically precludes them from being moved around easily.

A noticeable problem with all of the above types of concrete mixers is that the weight and cumbersome nature of the mixers prevents their easy movement, use and compact storage. Accordingly: i) Transportation of most concrete mixers from one site to another typically necessitates the use of a truck, trailer, or incorporation of wheels and a tow bar into the frame of the mixer; and ii) Use is restricted to individuals who have the physical strength to operate the mixers; and iii) A significant area is often required to install, use and store the mixers.

In addition, none of the above mentioned concrete mixers are readily dismantable.

Accordingly, the benefits of being able to dismantle the concrete mixer are unavailable to all of the above mentioned concrete mixers.

The advantages of dismantling the concrete mixer include ease of transport in a wide variety of vehicles, the only limitation being the ability to accommodate the largest component part within a vehicle. Accordingly, a dismantable mixer is more easily transported to the location where it is to be used.

Secondly, a dismantable concrete mixer may be more easily stored when separated into its component parts than as an assembled concrete mixer. This has advantages for many people who typically have only limited storage space available in a garage, shed, and so forth.

Further, a dismantable concrete mixer may be easier to use. It can be transported to any site in its component parts and mounted on site. Accordingly, a dismantable concrete mixer is more versatile in terms of where it may be taken and where it may be used.

It is an object of the present invention to address the foregoing problems or at least to provide the public with a useful choice.

Further aspects and advantages of the present invention will become apparent from the ensuing description that is given by way of example only.

DISCLOSURE OF INVENTION According to one aspect of the present invention there is provided mixing apparatus including component parts of: i) a mixing vessel; and ii) a stand; and ii) operating apparatus capable of rotating the mixing vessel, and wherein the mixing apparatus is characterised by being capable of being dismantled to its component parts.

The mixing apparatus shall now be referred to as a concrete mixer for ease of reference. However, it should be appreciated that use of this term is not to be seen as limiting.

Preferably, the concrete mixer also includes vessel supporting apparatus. While in some embodiments the mixing vessel could be attached directly to the stand, the vessel supporting apparatus of the present invention serves a number of functions, including: a) supporting of the mixing vessel in a range of positions with respect to the ground; and b) providing a point of attachment for the operating apparatus of the concrete mixer; and c) allowing pivoting of the mixing vessel with respect to the stand; and d) providing additional leverage means with which to pivot the mixing vessel, particularly when the contents of the mixing vessel would otherwise make the vessel heavy to pivot.

While the concrete mixer is preferably used for mixing concrete, it may also be used for mixing other materials, such as paint, fertiliser, grains and so forth.

For ease of reference, the mixing vessel shall now be referred to as a drum, although it should be appreciated that use of this term is not intended to be limiting.

In preferred embodiments of the present invention the drum includes a body, a cavity, a circumferential rim, a mouth, a base and baffling apparatus.

In one preferred embodiment the body of the drum is substantially cylindrical.

Being substantially cylindrical enables any contents of the drum to tumble within the drum when the drum is rotating without becoming otherwise lodged in corners or restricted by the shape of the drum, if the drum was otherwise configured.

The walls of the body of the drum are preferably substantially parallel to each other, except for a portion towards the circumferential rim of the drum where the walls of the body are substantially tapered towards the circumferential rim.

Having a portion of the body walls substantially tapered towards the circumferential rim contributes to retaining the contents of the drum within the drum during operation of the concrete mixer.

In another preferred embodiment the walls of the body of the drum are configured to include at least one cavity for receiving appropriately configured portions of joining means capable of joining the drum to the translational means of the operating apparatus of the mixer. The joining means is/are substantially U- shaped, preferably having a configuration appropriate for enabling the joining means to co-operate with the cavity (s) of the drum. This configuration of the drum and the associated joining means enables the drum to be made of lighter weight materials, while also providing necessary structural support for the drum.

Screws, bolts or other suitable apparatus may be used to secure the joining means to the body of the drum.

In one preferred embodiment of the present invention the drum is made of metal.

Metal is strong, durable and can be cut, welded or molded to any shape. In another preferred embodiment the drum is made of heavy-duty thermoplastic material.

However, in other embodiments of the present invention the drum may be made of other suitable materials, depending upon what the mixing apparatus is used for.

For example, the drum may be made of fibreglass, and so forth. Where the mixing apparatus is used in the food industry, the drum may be made of stainless steel, for hygiene reasons.

In preferred embodiments of the present invention a pair of baffling apparata are located on the internal walls of the body of the drum. Incorporating baffling apparatus into the drum contributes to the mixing process of the contents of the drum by accentuating the tumbling action of the contents as the drum rotates.

Alternately, the configuration of the walls of the body of the drum to receive portions of the joining means, may function as baffling apparatus.

The number of individual baffling apparatus incorporated into the drum may vary depending on the material required to be mixed in the drum, the size of the drum, and so forth.

The baffling apparata of the drum are preferably fixedly attached to or are integral with the internal walls of the body of the drum. Having the baffling apparatus fixedly attached or integral with the internal walls of the body of the drum enables each baffling apparatus to contribute to the mixing of the contents of the drum without the likelihood of the baffling apparatus being dislodged. This is particularly relevant where the mixing device is used to mix concrete or other bulky materials, where the sheering weight of such materials can apply a great deal of pressure to the internal baffling apparata.

Preferably, each baffling apparatus is welded into or onto the internal surface of the body walls of the drum. However, in other embodiments the baffling apparatus may be attached by any other suitable means such as rivets, bolts and so forth.

Preferably the baffling apparatus are oriented in a substantially vertical plane, substantially in line with the vertical walls of the body of the drum. However, in other embodiments the baffling apparata may be otherwise suitably oriented, such as being angled with respect to the vertical walls of the drum, and so forth.

The baffling apparatus is preferably a solid length of substantially flat material.

Having the baffling apparatus as a solid length of substantially flat material obviates problems of mixed concrete, or components of the concrete becoming lodged in cavities, apertures or contours of the baffling apparata. Further, a solid, substantially flat baffling apparatus is simpler and cheaper to manufacture and install, than a multi-piece or contoured baffling apparatus.

However, in other embodiments the baffling apparatus may be made of multiple pieces of material, and incorporate apertures, contours and so forth. The shape and structure of the baffling apparatus may in fact be determined by the materials being mixed.

Preferably, the baffling apparata are made of the same material as the drum.

However, in other embodiments the baffling apparata may be made of material different from that of the drum, depending on the method of attachment of the baffling apparata to the internal walls of the drum, or the use to which the mixing apparatus is put, and so forth.

In preferred embodiments of the present invention the circumferential rim of the drum is reinforced. Reinforcement may be achieved by folding a portion of the rim over onto itself. Having a reinforced circumferential rim helps to maintain the integrity of both the rim shape and the dimensions of the mouth of the drum.

However, other means of reinforcing the circumferential rim may be employed.

In preferred embodiments of the present invention the base of the drum is substantially flat. A substantially flat base contributes to the ease with which the contents of the drum may move around and become mixed within the drum as the drum rotates. However, in other embodiments of the present invention the base of the drum may be suitably contoured, such as by incorporating grooves, being concave, being convex, and so forth.

In one preferred embodiment a recess is incorporated into the centre of the base of the drum and projects into the cavity of the drum in a plane substantially perpendicular to the base of the drum. The recess is preferably configured to be or receive the joining means to join the translational apparatus of the operating apparatus to the drum.

However, in other embodiments a portion of the drum base itself may serve as the joining means capable of receiving the translational apparatus. For example, a portion may project from the base of the drum in a plane substantially perpendicular the base of the drum, and be configured to directly receive the translational apparatus without the need for separate joining means.

Alternately, in embodiments where joining means are used, a recess or other means capable of receiving the translational apparatus is incorporated into or onto the base portion of the drum.

In preferred embodiments of the present invention incorporating a recess, the recess is screw-threaded to complement the configuration of the translational apparatus of the operating apparatus which the recess receives. The direction of the screw-thread ensures that during operation of the concrete mixer movement of the drum, (or joining means) in conjunction with the movement of the translational apparatus, serves to tighten and retain the drum (or joining means) on the translational apparatus of the operating apparatus.

However, in other embodiments of the present invention the recess may be otherwise contoured, to receive and retain a different, complementary configured translational apparatus. For example, the recess of the drum may be configured to receive a translational apparatus with bayonet attachments, and so forth.

For ease of reference, the translational apparatus shall now be referred to as a spindle, although it should be appreciated that use of this term is not to be seen as limiting.

In preferred embodiments of the present invention the spindle acts in conjunction with driving apparatus to comprise the operating apparatus of the concrete mixer.

One end of the spindle is preferably connected to the driving apparatus.

Accordingly, output from the driving apparatus is capable of being transmitted to the spindle, thereby imparting movement to the spindle.

The opposite end of the spindle configured to engage with the complementary configured recess in the base of the drum, or the joining means is preferably screw threaded to enable it to be received in the recess of the drum. Accordingly, output from the driving apparatus causes the spindle to move which also results in movement of the drum.

In preferred embodiments of the present invention the driving apparatus preferably includes a motor operating in conjunction with gearing apparatus.

Preferably, the motor of the present invention is electrically driven by connection to a building's electrical power outlet. However, in other embodiments the motor may be fuel driven, driven by a compressor, or may be battery driven. These embodiments may be preferable in the absence of an electrical power point and would also enable the concrete mixer to be used in any location.

Alternately, the driving apparatus may include a handle capable of engaging a toothed rack. Accordingly, movement of the handle is translated to movement of the toothed rack, which in turn is translated to movement of the spindle which results in movement of the drum. This arrangement may be required in the absence of electrical, or fuel operated driving apparatus.

In preferred embodiments of the present invention activation of the driving apparatus results in rotation of the spindle. This rotary movement is translated via the spindle to the drum which also therefore rotates. Rotation of the drum enables the contents of the drum to be mixed. However, in other embodiments activation of the driving apparatus may result in non-rotational movement of the spindle.

Accordingly, similar non-rotational movement of the drum may achieve mixing of the contents of the drum (for example by agitation and so forth).

In preferred embodiments of the present invention the vessel supporting apparatus includes a frame and shielding apparatus.

The frame of the vessel supporting apparatus preferably incorporates at least two substantially parallel frame members and at least one bracing member.

However, in other preferred embodiments of the present invention the frame of the vessel supporting apparatus may be otherwise suitably configured to include a greater number of frame members and/or bracing members. Alternately, in other embodiments the frame may incorporate a single continuous frame member which is bent and looped back upon itself to produce a suitably shaped frame, or be otherwise suitably configured.

Preferably, the frame members of the vessel supporting apparatus are substantially S-shaped. The substantially S-shaped frame members accordingly include a substantially flat central portion and substantially curved distal portions. The substantially curved distal portions extend in a plane substantially perpendicular to the flat central portion, but in opposite directions to each other and to the plane of the central portion.

A first end of each frame member is preferably capable of resting on the ground, thereby contributing to the support of the concrete mixer with respect to the ground. This first end of each frame member therefore acts as a leg portion.

The opposite second end of each frame member is preferably substantially curved outward from the longitudinal axis of the frame member. This configuration enables the second end of each individual frame member to engage with a portion of the stand of the concrete mixer. The second end thereby acting as a stop during any pivoting action of the vessel supporting apparatus, with respect to the stand.

Preferably, each bracing member is arranged substantially perpendicular to the frame members of the vessel supporting apparatus and connects the frame members to each other.

In preferred embodiments of the present invention a first bracing member is fixedly attached to the frame members in the central portion of the frame, but in the region towards one end of the frame members. Positioning a first bracing member at this location enables the first bracing member to not only connect the frame members to each other, but also to strengthen the frame for supporting the drum, when the concrete mixer is assembled.

Preferably, the distal portion of each end of the first bracing apparatus extends past each frame member. This configuration enables the bracing member to engage with the stand of the concrete mixer.

In preferred embodiments of the present invention the first bracing member is capable of engaging with the stand of the concrete mixer, by insertion of the distal portions of the bracing member of the frame into receiving apparatus located on the stand.

However, in other embodiments the first bracing member may be otherwise suitably configured to enable the first bracing member to interact with the stand of the concrete mixer.

The distal portions of the first bracing member are preferably retained in position in each receiving apparatus of the stand via retaining means, such as pins, which operate to prevent the first bracing member form sliding out of, or being pulled out of, the receiving apparata of the stand.

Further, in embodiments with only a single bracing member, the first bracing member may also be preferably configured to receive a portion of the shielding apparatus of the vessel supporting apparatus.

Accordingly, such configuration of the first bracing member contributes to maintaining the shielding apparatus in the required position, when the concrete mixer is assembled.

In embodiments that include a second bracing member, the second bracing member is preferably positioned substantially parallel to the first bracing member, but in a region closer towards the central portion of the stand, than the first bracing member.

Accordingly, where there are two bracing members, the first bracing member may be preferably configured to engage with the stand of the concrete mixer, while the second bracing member may be configured to engage with the shielding apparatus of the frame.

The central portion of each frame member preferably incorporates attachment apparatus capable of attaching the shielding apparatus to the frame.

In preferred embodiments of the present invention the attachment apparatus of the frame are parallel guide rails which incorporate apertures for receiving securing apparatus. Accordingly, the shielding apparatus is able to slide between the parallel guide rails and be attached to the frame via bolts, or other suitable means, such as pins, and so forth.

However, in other embodiments of the present invention any other suitable means of attaching the shielding apparatus to the frame may be used.

For ease of reference, the shielding apparatus shall now be referred to as a cover plate, although it should be appreciated that use of this term is not intended to be limiting.

In preferred embodiments of the present invention the cover plate is contoured to conform to the shape of the frame to which it is attached. Having the cover plate conform to the shape of the frame enables the cover plate to shield the motor and gears of the driving apparatus from the weather and fluid spills and splashes which may occur during use of the concrete mixer, as well as also avoiding problems of the cover plate interfering with the operation of other parts of the concrete mixer.

In preferred embodiments of the present invention the cover plate includes an aperture. The aperture enables the spindle of the operating apparatus to pass through the cover plate, while enabling the motor and gears to remain covered.

In preferred embodiments of the present invention the cover plate also incorporates holding apparatus. For ease of reference, the holding apparatus shall now be referred to as a hand grip. However, use of this term is not intended to be limiting.

Incorporating a hand grip into the cover plate preferably enables the vessel supporting apparatus and/or the cover plate to be carried. Alternatively, when the concrete mixer is fully assembled, the hand grip enables the vessel supporting apparatus to be raised relative to the ground. This is achieved by an operator lifting the leg portions of the frame of the vessel supporting apparatus off the ground via the hand grip.

In embodiments of this invention the hand grip is preferably a cut out section of the cover plate. However, the hand grip may also be a handle affixed to the cover plate, or may be any other suitable holding apparatus incorporated into the vessel supporting apparatus or other components of the mixing apparatus.

In preferred embodiments of the present invention the vessel supporting apparatus is capable of pivoting with respect to the stand. The ability to pivot the vessel supporting apparatus with respect to the stand is achieved via rotation of the distal portions of the first bracing member of the frame within receiving apparatus located on the stand, when the vessel supporting apparatus is lifted by the hand grip of the cover plate, or by lifting the leg portions of the frame.

Accordingly, the vessel supporting apparatus may be elevated through a range of positions, from a position substantially parallel to the ground surface (where the vessel supporting apparatus is in a substantially horizontal plane), to a position where the vessel supporting apparatus is in a substantially vertical plane (substantially perpendicular to the ground surface).

When the concrete mixer is assembled the ability to pivot the vessel supporting apparatus is required to enable any contents of the drum to be emptied out.

Accordingly, when the drum is attached to the spindle of the operating apparatus, and the leg portions of the vessel supporting apparatus are on the ground, the drum is substantially upright and in a plane substantially perpendicular with the central portion of the vessel supporting apparatus. In this position, the mouth of the drum is facing upwards.

As the leg portions of the vessel supporting apparatus are lifted, and the vessel supporting apparatus is pivoted with respect to the stand, through a range of elevations to a final position where the vessel supporting apparatus is in a substantially vertical plane with respect to the ground. In this position, the drum (attached to the spindle) is substantially tipped over in a plane substantially horizontal with respect to the ground. The mouth of the drum is facing substantially downwards when the drum is in this position. Accordingly, the contents of the drum may be emptied out.

Movement of the vessel supporting apparatus through a complete 180° is prevented by the outwardly contoured second ends of each frame member engaging with the stand of the concrete mixer.

In preferred embodiments of the present invention the stand of the concrete mixer includes two substantially angled legs joined by a detachable connecting portion.

The legs of the stand are preferably triangular-shaped. Having substantially triangular-shaped legs provides greater bracing support for the concrete mixer.

However, in other embodiments the legs may be otherwise suitably shaped.

Preferably, the two substantially triangular legs are interconnected by a substantially straight, detachable connecting rod. Having the two substantially triangular legs connected by a substantially straight connecting rod provides additional strength to the stand, and also acts as a stop for preventing movement of the vessel supporting apparatus beyond the position required for the vessel supporting apparatus to rest on the ground.

In other embodiments, the legs of the stand may be interconnected by other suitably configured detachable connecting means; or the legs may be permanently connected to each other.

In preferred embodiments of the present invention the detachable connecting apparatus is pivotally attached to one of the legs of the stand. Having the detachable connecting apparatus pivotally attached to one of the legs obviates problems of losing the connecting apparatus. Further, when the concrete mixer is disassembled, the connecting apparatus may lie compactly in-line with the leg of the stand to which it is attached, and the two separated legs may be stored more space effectively and efficiently than if the stand was permanently assembled.

Alternately, when the concrete mixer is assembled, the connecting apparatus may be pivoted to a position substantially perpendicular to the leg to which it is attached, and connected to the other leg of the stand (by any suitable means, such as a pin, and so forth), thereby enabling the stand to be quickly assembled, ready for use.

Each leg of the stand also preferably includes receiving apparatus. The receiving apparatus of each leg is capable of receiving a distal portion of the first bracing member of the vessel supporting apparatus. Accordingly, the receiving apparatus in conjunction with the first bracing member enables the vessel supporting apparatus to pivot with respect to the stand.

However, in other embodiments any other suitable configuration that enables the vessel supporting apparatus to pivot with respect to the stand may be used.

In preferred embodiments of the present invention the receiving apparatus of each leg of the stand is substantially tubular. Accordingly, the shape of the receiving apparatus conforms with and is able to receive the distal portion of the rod-shaped first bracing member. However, in other embodiments the receiving apparatus may be otherwise suitably configured to complement the shape and movement of the preferred bracing member or other pivoting means incorporated into the concrete mixer.

Each receiving apparatus is preferably attached substantially towards the apex of the triangular legs of the stand to enable each distal portion of the bracing member to freely rotate within the receiving apparatus, thereby enabling the vessel supporting apparatus to be pivoted through a range of elevations. In other embodiments however, the receiving apparatus may be suitably positioned elsewhere on the legs.

Preferably, the vessel supporting apparatus and the stand of the concrete mixer are also made of metal for strength, durability and versatility of manufacturing processes to produce these component parts. However, in other embodiments some portions of the vessel supporting apparatus and the stand may be made of other suitable materials. For example, the cover plate may be made of fibreglass, and so forth.

In preferred embodiments of the present invention the concrete mixer is capable of being easily and quickly dismantled into its component parts after use. The ability to quickly and easily dismantle the concrete mixer is achieved by the design of the component parts of the concrete mixer which are able to slide into each other, or are complementary screw-threaded. Accordingly, a single person is able to dismantle or reassemble the concrete mixer without the need for any specialised tools or equipment.

The ability to dismantle the concrete mixer into its component parts enables: a) Each part to be more thoroughly cleaned, than may be possible with standard non-dismantable mixers. b) The concrete mixer to be more easily transported in a greater range of vehicles than is typically possible with standard non-dismantable mixers.

The drum is the bulkiest part, and accordingly, determines whether a particular vehicle may be used to transport the mixer. c) The concrete mixer to be more efficiently stored, compared with the typically bulky, standard, non-dismantable mixers. The component parts may be hung up, stored off the ground, and so forth. d) Easier use of the mixer by a greater range of people. The ease with which the mixer may be assembled and disassembled, and the lighter weight of the individual and assembled component parts, contribute to enabling a range of men and women to more easily use the concrete mixer.

Typically, the heavy, bulky construction of existing non-dismantable mixers precludes their use by any but those with the greater physical strength required to move and/or operate existing mixers.

Some embodiments of the present invention may also incorporate wheel (s) to enable the concrete mixer to be more easily moved around on site, once assembled.

In one preferred embodiment of the present invention the concrete mixer may be dismantled by first unscrewing or otherwise detaching the drum from the spindle.

Once the drum is removed the assembled vessel supporting apparatus is disconnected from the stand of the concrete mixer. Accordingly, the retaining means are removed from the distal portions of the first bracing member of the assembled vessel supporting apparatus, to enable the first bracing member to slide out of the receiving apparatus of the stand. Lastly, the free end of the connecting portion of the stand is disconnected from the leg to which it has been temporarily attached. The connecting portion is then free to pivot to a position in line with the leg to which it is pivotally attached. The two legs of the stand are then separated from each other.

The component parts of the concrete mixer may then be separately and easily carried, or loaded into a vehicle for transport to another site or for storage.

Assembly of the concrete mixer is preferably achieved by reversal of the above.

BRIEF DESCRIPTION OF DRAWINGS Further aspects of the present invention will become apparent from the ensuing description which is given by way of example only and with reference to the accompanying drawings in which: Figure 1 is a diagrammatic perspective view of the dismantable mixing apparatus in accordance with one embodiment of the present invention, and Figure 2 is a diagrammatic perspective view in exploded form of the mixing apparatus in accordance with one embodiment of the present invention, and Figure 3 is a diagrammatic cross-sectional view of the drum and spindle of the mixing apparatus in accordance with one embodiment of the present invention, and Figure 4 is a diagrammatic perspective view of the vessel supporting apparatus in accordance with one preferred embodiment of the present invention, and Figure 5 is a diagrammatic perspective view of the vessel supporting apparatus in accordance with another preferred embodiment of the present invention, and Figure 6 is a diagrammatic perspective view of the vessel supporting apparatus in accordance with another preferred embodiment of the present invention, and Figure 7 is a diagrammatic side view of the mixing apparatus in accordance with one embodiment of the present invention, and Figure 8 is a diagrammatic side view of the mixing apparatus in accordance with one embodiment of the present invention, and Figure 9 is a diagrammatic perspective view of the mixing apparatus in accordance with one embodiment of the present invention.

Figure 10 is a diagrammatic top plan view of the drum of the mixing apparatus in accordance with another embodiment of the present invention, and Figure 11 is a diagrammatic side view of the drum and joining means of the mixing apparatus in accordance with another embodiment of the present invention; and Figure 12 is a diagrammatic perspective view of the mixing apparatus in accordance with another embodiment of the present invention; and Figure 13 is a diagrammatic perspective view of the mixing apparatus in accordance with a further embodiment of a fold-up module of the present invention; and Figure 14 is a diagrammatic perspective of part of the fold-up module of Figure 13 in a dismantled state in accordance with that embodiment of the present invention; and BEST MODES FOR CARRYING OUT THE INVENTION With reference to the diagrams (Figures 1 to 9 and Figures 12 to 14) by way of example only, there is provided a mixing apparatus generally indicated by arrow 1.

The mixing apparatus 1 (as shown in Figure 1) includes a mixing vessel 2. Vessel supporting apparatus 3 is capable of supporting the mixing vessel 2. The vessel supporting apparatus 3 also allows pivoting of the mixing vessel 2 with respect to the stand 4 of the mixing apparatus 1.

Operating apparatus 35 is capable of rotating the mixing vessel 2.

The mixing apparatus 1 is characterised in that it is also capable of being dismantled into its component parts (shown in Figure 2 and (partially) Figure 14).

For ease of reference, the mixing apparatus 1 and the mixing vessel 2 shall now be referred to as a concrete mixer 1 and a drum 2, respectively. However, it should be appreciated that use of these terms is not intended to be limiting.

The drum 2 of the concrete mixer 1 includes a body 5, a cavity 6, a circumferential rim 7, a mouth 8, a base 9 and baffling apparatus 10 (as shown in Figure 3).

The drum 2 is substantially cylindrical. Accordingly, the walls of the body 5 of the drum 2 are substantially parallel to each other, except for a substantially tapered portion 11 towards the circumferential rim 7 of the drum 2.

The shape of the drum 2 contributes to retaining the contents of the drum 2 within the drum 2 during operation of the concrete mixer 1, as well as enabling the contents of the drum 2 to tumble freely within the drum 2 when it is rotating.

A pair of baffling apparata 10 is attached to the internal walls of the body 5 of the drum 2. The baffling apparata 10 contribute to the mixing process of contents within the drum 2 by accentuating the tumbling action of the contents as the drum 2 rotates.

The baffling apparata 10 of the drum 2 are preferably welded to the internal surface of the walls of the body 5 of the drum 2. However, in other embodiments the baffling apparata 10 may be attached by another suitable means, such as by rivets, and so forth.

The baffling apparata 10 are oriented in a substantially vertical plane, which is substantially in line with the vertical walls of the body 5 of the drum 2.

Each baffling apparata 10 is preferably a solid length of substantially flat material which is designed to obviate problems of the contents of the drum 2 becoming trapped by the baffling apparatus 10.

The baffling apparata 10 are preferably made of the same material as the drum 2.

Accordingly, the baffling apparata 10 will preferably be made of metal.

However, depending upon the use to which the mixing apparatus 1 is put, and on the method of attachment of the baffling apparata 10 to the internal walls of the body 5 of the drum 2, the baffling apparata 10 may be made of other suitable materials, including thermoplastics materials.

The circumferential rim 7 of the drum 2 is folded over onto itself to reinforce the circumferential rim 7. The reinforced circumferential rim 7 operates to maintain the integrity of both the circumferential rim 7 shape and the dimensions of the mouth 8 of the drum 2.

The base 9 of the drum 2 is substantially flat. The substantially flat base 9 enables the drum 2 to be supported by and conform to the shape of the vessel supporting apparatus 3.

In another preferred embodiment, as shown in Figures 10 and 11, the drum 2, while still substantially cylindrical, is configured to include cavities 34 for receiving appropriately configured portions 38 of joining means 36.

The joining means 36 is capable of joining the drum 2 to the spindle 13 of the operating apparatus 35, via a complementary configured recessed portion 12, located in the base 37 of the joining means 36 which engages with the spindle 13.

Alternately, as shown in Figure 3, a recess 12 is incorporated into the centre of the base 9 of the drum 2. The recess 12 projects into the cavity 6 of the drum 2 in a plane substantially perpendicular to the base 9 of the drum 2.

The recess 12 is suitably configured to receive complementary configured translational apparatus 13 of the operating apparatus 35 of the concrete mixer 1.

Accordingly, the recess 12 is preferably screw-threaded to complement the screw- thread on the translational apparatus 13 of the operating apparatus 35 of the concrete mixer 1. During operation of the concrete mixer 1, rotation of the drum 2 serves to tighten and retain the drum 2 on the translational apparatus 13 of the operating apparatus 35.

For ease of reference, the translational apparatus 13 shall now be referred to as a spindle 13, although it should be appreciated that use of this term is not to be seen as limiting.

The spindle 13 acts in conjunction with the driving apparatus 15 of the operating apparatus 5.

The driving apparatus 15 includes an electric powered motor and gears.

The spindle 13 is preferably connected to the driving apparatus 15 such that output from the driving apparatus 15 is capable of being transmitted to the spindle 13, thereby causing the spindle 13 to rotate.

The free end 16 of the spindle 13 is screw-threaded to enable the spindle 13 to be received in the complementary configured recess 12 in the base 9 of the drum 2 (or in the joining means 36). Accordingly, output from the driving apparatus 15 which causes the spindle 13 to rotate also results in rotation of the drum 2.

Figures 2,4,5 and 6 illustrate one preferred embodiment of the vessel supporting apparatus 3. Figures 12 and 13 show preferred alternative embodiments of the vessel supporting apparatus 3.

The vessel supporting apparatus 3 illustrated in Figures 2,4 to 6, and 12 includes a frame generally indicated by arrow 17 and shielding apparatus 18.

The frame 17 of the vessel supporting apparatus 3 includes two substantially parallel frame members 19 and 20, and at least one bracing member 21.

The frame members 19 and 20 of the vessel supporting apparatus 3 are substantially S-shaped. Accordingly, the S-shaped frame members 19 and 20 include a substantially flat central portion, generally indicated by arrow 22, and substantially curved distal portions generally indicated by arrow 23.

The substantially curved distal portions 23 of the frame members 19 and 20 extend in a plane substantially perpendicular to the flat central portion 22, but in opposite directions to each other and to the plane of the central portion 22.

A first end 24 of each frame member 19 and 20 is capable of resting on the ground. Accordingly, this first end 24 of each frame member 19 and 20 acts as a leg portion to support the vessel supporting apparatus 3 with respect to the ground, when the concrete mixer 1 is assembled (as shown in Figures 4 and 6).

In another embodiment, illustrated in Figures 5 and 13 to 14, the frame members 19 and 20 may be continuous with each other, as opposed to being separate.

A second end 25 of each frame member 19 and 20 of embodiments illustrated in Figures 1 to 9 is substantially curved outward from the longitudinal axis of each frame member 19 and 20.

This configuration of the second end 25 of the frame members 19 and 20 enables the second end 25 of each frame member 19 and 20 to engage with the stand 4 of the concrete mixer 1.

A first bracing member 21 is arranged substantially perpendicular to the frame members 19 and 20, and may connect the frame members 19 and 20 to each other (as shown in Figures 4,6 and 13).

In Figure 5, a first bracing member 21 is attached to each frame member 19 and 20, but does not connect the two frame members to each other.

The distal portions 26 of the first bracing member 21 extend past the frame members 19 and 20. This configuration enables the first bracing member 21 to engage with the stand 4 of the concrete mixer 1.

The first bracing member 21 is fixedly attached to the frame members 19 and 20 in the central portion 22 of the frame 17, but towards the region of the second end 25 of the frame members 19 and 20. Positioning of the first bracing member 21 at this location also enables the distal portion 26 of the first bracing member 21 to engage with the stand of the concrete mixer 1, as well as the first bracing member 21 also providing additional support to the drum 2 when the concrete mixer 1 is assembled.

The first bracing member 21 is capable of engaging with the stand 4 of the concrete mixer 1 by insertion of the distal portions 26 of the first bracing member 21 into receiving apparatus 31 located on the stand 4.

The first bracing member 21 is retained in the receiving apparatus 31 of the stand 4 via locking pins, or other suitable retaining means, to prevent the first bracing member 21 from sliding out of the receiving apparatus 31 while the concrete mixer 1 is being used.

Alternately, a portion 39 of the frame members 19 and 20 may be configures to engage with the receiving apparatus 31 as shown in embodiments illustrated in Figures 12 to 14.

In some embodiments a second bracing member 14 may also be incorporated into the vessel supporting apparatus 3 (as shown in Figures 4 and 5). The second bracing member 14 may be positioned more towards the central portion 22 of the vessel supporting apparatus 3 to provide additional support for the drum 2.

In addition, the second bracing member 14 may be configured to receive a portion of the shielding apparatus 18 (as shown in Figures 4 and 5). Accordingly, the second bracing member 14 may incorporate an aperture or slit, into which a portion of the shielding apparatus 18 may be fitted to provide an attachment point and support for the shielding apparatus 18.

The central portion 22 of the frame 17 may also incorporate attachment apparatus 27 as shown in the embodiment illustrated in Figures 1 to 9. The attachment apparatus 27 are located on each frame member to enable the shielding apparatus 18 to be attached to the frame 17.

The attachment apparatus 27 are preferably parallel guide rails 27 which incorporate apertures 28 for receiving securing apparatus, such as bolts, to secure the shielding apparatus 18 to the frame 17.

For ease of reference, the shielding apparatus 18 shall now be referred to as a cover plate 18, although it should be appreciated that use of this term is not intended to be seen as limiting.

The cover plate 18 is contoured to conform in part to the shape of the frame 17 (as shown in Figures 1 and 2).

The cover plate 18 is designed to shield the driving apparatus 15 from the weather and fluid spills and splashes which may occur during the use of the concrete mixer 1.

The cover plate 18 is attached to the frame 17 by sliding the cover plate 18 into the parallel guide rails 27 (as shown in Figure 2), and securing the cover plate in position via securing apparatus, such as bolts through apertures 28 in the guide rails 27.

In some embodiments the cover plate 18 may be further supported by being fitted into a suitably configured aperture or slit, in the second bracing member 14 (as shown in Figures 4 and 5).

The cover plate 18 also incorporates a spindle receiving aperture 29 (as shown in Figure 2 and 3). The aperture 29 enables the spindle 13 of the operating apparatus 35 to pass through the cover plate 18, while enabling the driving apparatus 15 (the motor and gears), to remain covered.

The cover plate 18 also incorporates a hand grip 30. The hand grip 30 may be used to carry the vessel supporting apparatus 3 and/or the cover plate 18.

Alternately, when the concrete mixer 1 is fully assembled, the hand grip 30 may be used to raise the vessel supporting apparatus 3 and the attached drum 2 through a range of elevations to enable the drum 2 to be pivoted for emptying.

In preferred embodiments the hand grip 30 is provided by a cutout section in the cover plate 18. However, a handle or other gripping means may be incorporated into the cover plate 18 or the frame 17 of the vessel supporting apparatus 3 (as shown in alternative embodiments illustrated in Figures 13 and 14. Alternately, the frame members 19 and/or 20 themselves may be used as a handle/grip as shown in Figure 12).

The ability to raise the vessel supporting apparatus 3 and the drum 2 with respect to the ground is achieved by pivoting of the vessel supporting apparatus 3 with respect to the stand 4.

Pivoting of the vessel supporting apparatus 3 with respect to the stand 4 is achieved in the embodiments illustrated in Figures 1 to 9, by rotation of the distal portions 26 of the first bracing member 21 within receiving apparatus 31 located on the stand 4.

In Figures 12 to 14 rotating of portion 39 of the vessel supporting apparatus 3 within the receiving apparatus 31 located on the stand 4 results in providing of the vessel supporting apparatus 3 with respect to the stand 4.

The vessel supporting apparatus 3 may be lifted by the hand grip 30 of the cover plate 18, or by lifting the first end 24 leg portions of the frame 17.

Accordingly, the vessel supporting apparatus 3 may be elevated through a range of positions, from a position that is substantially horizontal and substantially parallel to the ground surface, to a position which is substantially vertical and substantially perpendicular to the ground surface. A range of positions is illustrated in Figures 1,7,8,9,12 and 13.

Accordingly, when the drum 2 is first attached to the spindle 13, the drum 2 is substantially upright and attached in a plane substantially perpendicular to the central portion 22 of the vessel supporting apparatus 3. The mouth 8 of the drum 2 is facing upwards (as shown in Figure 7).

When the drum 2 is positioned to allow the contents of the concrete mixer 1 to be mixed, the drum 2 and the mouth 8 of the drum are both angled with respect to the vessel supporting apparatus 3 (as shown in Figures 1,8 and Figure 12).

When the contents of the drum 2 are required to be emptied, the vessel supporting apparatus 3 is raised through a range of elevations to a position where the vessel supporting apparatus 3 is in a position substantially perpendicular to the ground surface. At this position, the mouth 8 of the drum 2 is facing substantially downwards, and the contents of the drum 2 can be emptied (as shown in Figures 9 and 13).

Movement of the vessel supporting apparatus through a full 180° is prevented by the outwardly contoured second ends 25 (of each frame member 19 and 20) engaging with the stand 4 (as shown in Figure 9), or by the physical contact of the drum 2 with structural features of the stand 4.

The stand 4 of the concrete mixer 1 includes two substantially angled legs 32 (as shown in Figures 2,12 and 13). The overall shape created by the arrangement of the legs 32 is substantially triangular which provides support to the concrete mixer 1 throughout the full range of operating positions.

The legs 32 may be joined by a detachable, connecting portion 33 as in the embodiment illustrated in Figures 1 to 9, or may be integral with each other as illustrated in Figure 13.

The connecting portion 33 is a substantially straight connecting rod 33 in the embodiment illustrated in Figures 1 to 9 or may be a molded section integral with the legs 32 (as shown in Figure 13). The connecting portion 33 of Figures 1 to 9 serves as a stop against the vessel supporting apparatus 3 moving beyond the position required for the vessel supporting apparatus 3 to rest on the ground.

In embodiments illustrated in Figures 1 to 9, the connecting portion 33 is pivotally attached to one of the legs 32 of the stand 4. Accordingly, when the concrete mixer 1 is assembled, the connecting portion 33 is pivoted to a position substantially perpendicular to the line of the leg 32, and attached via a pin, bolt, or other suitable means to the other leg 32 of the stand 4.

Each leg 32 of the stand 4 also includes receiving apparatus 31.

The receiving apparata 31 are configured to receive the distal portions 26 of the first bracing member 21 of the vessel supporting apparatus 3, or a portion 39 of the frame members 19 and 20. The receiving apparata 31 are positioned towards the apex 34 of the legs 32 of the stand 4.

Each receiving apparatus 31 is also configured to enable the distal portions 26 of the first bracing member 21, or the portion of the frame members 19 and 20, to rotate within the receiving apparatus 31. This enables the vessel supporting apparatus 3 to pivot with respect to the legs 32 of the stand 4, and be raised through a range of elevations required during the operation of the concrete mixer 1.

The concrete mixer 1 may also incorporate wheels to enable the partially or fully assembled concrete mixer 1 to be moved around on site, and so forth.

The design of component parts (particularly as illustrated in Figure 14) which are able to slide into each other or are complementary screw-threaded enables an assembled concrete mixer 1 to be easily dismantled by a single operator without the need for special tools or equipment. For example, the substantially tubular rear legs 32 of the stand 4 in Figures 13 and 14 are able to be contained within the contoured front leg section 40 of the stand 4, when the mixer 1 is to be stored (as shown in the folded up module embodiment of Figure 14).

The embodiment of Figure 12 also illustrates the provision of a fluid supply hose 41 stored on appropriately configured reel arrangement associated with the legs of the concrete mixer 1.

Dismantling the concrete mixer into its component parts enables the concrete mixer to be more easily stored, transported in a vehicle, or relocated on the site where it is to be used.

Dismantling of one embodiment the concrete mixer 1 into its component parts is illustrated, in part, in Figure 2, and is achieved by first unscrewing the drum 2 from the spindle 13.

The assembled vessel supporting apparatus 3 may then be disconnected from the stand 4 of the concrete mixer 1, by removal of the securing pins, or other means, used to retain the first bracing member 21 in the receiving apparatus 31 of the stand 4.

The connecting portion 33 of the legs 32 of the stand 4 may then be disconnected from one of the legs 32, to separate the stand 4 into its component parts.

Each component part of the concrete mixer 1 may then be carried separately to a location for storage, reuse, or to a vehicle for transportation.

In the folded-up module embodiment of Figures 13 and 14, the drum 2 is first removed. The rear legs 32 are then slipped or clipped into appropriately configured regions of the front contoured legs 40. The stand 3 is folded/pivoted over onto the contoured leg portion 40 to form a compact unit (Figure 14). That unit can then be carried or hung up in storage by the handle portion 30.

Aspects of the present invention have been described by way of example only and it should be appreciated that modifications and additions may be made thereto without departing from the scope thereof as defined in the appended claims.