SURFACE DEBRIS REMOVAL APPARATUS

The technical field

The invention relates to a surface cleaning apparatus intended as a motor assisted device that will be used to clean internal floor spaces and upholstery in houses and offices.

The background art

No similar apparatus was described before.

The content of invention

The device of invention comprises of a head unit that incorporates two elongate cylindrical rotating bristled cleaning bars that are driven such that they contra rotate and are positioned close to one another at the forward region of the head unit.

The head unit also contains electric motors and a drive system extending between the motors and the cleaning bars. Each cleaning bar is driven by a separate motor. Alternatively one motor can be used to drive both cleaning bars.

The cleaning bars rotation is such that the forward most cleaning bristled bar rotates in the direction which would pull the device forwards along the surface being cleaned and the rearmost cleaning bristled bar rotates in the opposite direction to the forward one. A fixed surface may be provided between the two cleaning bars inclined from the vertical and extending from the base of the product wrapping around part of the circumference of the rear most cleaning bar. This wall directs debris from both the front and rear cleaning bars rearwards to the debris collection reservoir. A fixed surface inclined from the vertical may be provided between the rearmost cleaning bar and the debris reservoir.

The forward most rotating bristled cleaning bar may be driven from a given distance along its length and not from one end. For example, a toothed belt, 'V belt or worm drive can be driven from an electric motor rotating a pulley or gear with splined shafts extending either side of its axis of rotation. The forward most

cleaning bar may comprise of two shorter bristled cleaning bars with splined holes in them to engage with the splined shafts of the drive pulley and provide rotational drive to each side of the front cleaning bar.

Each side of the front cleaning bar can be removed along its axis and out from the sides of the device for periodic cleaning and removal of entangled hair or debris. The opposite end of the front cleaning bar from the splined hole has a bearing and bearing cap assembled to it. The bearing cap has locating features that secure each cleaning bar to the head unit of the device. Removal of each side of the front cleaning bars can be made by rotating the bearing cap relative to the head unit of the product releasing it for removal along the axis of the cleaning bar. The rotation of the bearing cap for release is in a direction such that the direction of rotation of the front cleaning bar when in use tends to keep the bearing cap in the locked position. Removal of the bearing cap to extract each side of the front cleaning bar can be performed by hand or alternatively it can have features that locate with either a custom removal tool or a common workshop tool. Alternatively the bearing caps can be detached from the head unit of the product by a method other than rotation. Attached to the head unit is a steering handle unit that encloses a removable battery pack to power the device and operating switches/controls. Alternatively the electric drive motors can be mains or fuel cell powered. The removable battery pack can be recharged when attached to the device using a charging jack on the device or be recharged when removed from the device by cable attachment or in a charging dock. The battery pack may come in a variety of package sizes dependent on the number of cells contained within the battery pack to alter the product's performance. All battery pack sizes share a common format for physical and electrical attachment to the device. The device may incorporate a series of electronic settings to change the rotational velocities of each cleaning bar independently or coupled. For example hard floors and carpet may have different cleaning bar rotational velocities for optimal debris removal from the surface in question. Different settings can also be used for changing the product performance. The tubular portion of the handle mechanism attached to the head unit of the device may incorporate an airflow passage through it to allow the addition of a

vacuum to be attached to the handle tube for additional fine particle cleaning. The vacuum tube terminates in the head unit in a horizontal cavity between the two cleaning bars with access holes or slots for air flow to a vacuum unit. The action of the two rotating bristled cleaning bars causes debris particles to be dislodged from the surface being cleaned and propelled rearwards into the debris collection reservoir, dislodged fine particles such as dust are light and small enough to be entrained into the vacuum airflow path and taken to a separate debris reservoir as part of the vacuum unit on the handle mechanism. The vacuum and debris reservoir assembly mounted on the handle may incorporate the rechargeable battery pack, fuel cell or mains cord to power the overall device. The vacuum and debris reservoir assembly maybe removable and when separated from the handle of the main assembly be used independently to clean upholstery, curtains etc. The handle mechanism comprises of a pivoting arm attached to the head unit where the pivot is positioned between wheels or rollers at the front of the head unit and wheels or rollers at the rear, such that when the product is manoeuvred during use there is no tendency for the leading edge of the product to dive into, or lift away from, the surface being cleaned. Attached to the pivoting arm is a rotating steering joint set at an angle from the longitudinal axis of the tubular portion of the handle assembled into it. When the upper portion of the handle is rotated about its axis the angled steering joint causes the lower portion and head unit of the product to rotate, providing a steering action.

The steering mechanism can incorporate a sprung locking strut that interacts with the rotating joint on the head and is driven from the pivoting angle joint. The angle at which the lock is activated can be changed by the design of the geometry and is not limited to a single lock position. For example when the handle is rotated fully forwards about the pivot on the base unit the sprung locking strut activates to retain the angled steering joint in its centre position. This steering lock mechanism allows easy and stable storage of the product's handle component in a pre-determined position. Attached to the rear of the head unit is a removable debris collection reservoir that can be detached from the head unit by depressing a release button or other methods. The debris reservoir may have an automatic mechanical closing door system operated by removal of the debris reservoir from the head unit. The automatic closing door prevents spillage of collected debris when the user transfers it to a waste container. The debris reservoir release button may act as the

debris reservoir door opening feature when it is removed from the head unit. A safety feature either mechanical or an electrical switch can be employed to activate when the debris reservoir is removed to prevent the cleaning bars from rotating should the device be accidentally switched on. The device may incorporate as part of the debris reservoir a mechanical or electric motor driven fan and filter assembly to create airflow from the forward portion of the head unit past the cleaning bars into the debris reservoir. This airflow will help entrain less dense particles into the debris reservoir improving fine particle cleaning performance. A preferred embodiment of the invention will now be described with reference to the accompanying drawings in which:

The brief description of figures

Figure 1 is a perspective view of the surface cleaning apparatus as described in the present invention;

Figure 2 is an top plan view of one embodiment of the head unit of the surface cleaning apparatus with the top cases removed from the head unit for clarity, as described in the present invention;

Figure 3 is a perspective view partially in section of the head unit assembly of the surface cleaning apparatus shown in Figure 2;

Figure 4 is a perspective view of the surface cleaning apparatus with the handle assembly is in a tilted position as described in Figure 1.

The mode of carrying out the invention

The surface cleaning apparatus shown in Figure 1 comprises of a head unit 1 , a debris collection reservoir 2, a lower handle assembly 3 and upper handle assembly 4 suitably moulded from a plastics material. The tubular section 5 of the upper handle assembly is an aluminium extrusion or moulded from a plastics material. The head unit 1 contains electric motors and two elongate cylindrical rotating bristled cleaning bars driven such that they contra rotate. Figures 2 and 3 show the mechanical layout of the head unit. Cleaning bars 7 and

8 rotate in the direction of the curved arrows in Figure 3 and are positioned in the head unit such that they contact the surface to be cleaned. Cleaning bar 7 rotates propelling debris and dust up the rearwards curved wall 9 into the debris collection reservoir 10. Cleaning bar 8 rotates in the opposite direction to cleaning bar 7 and propels debris and dust around the curved wall 11 and into the debris collection reservoir 10. The use of this dual contra rotating brush bar arrangement provides two sets or cleaning bars to pass over the surface being cleaned for each pass of the invention. When the invention is being propelled across the surface being cleaned in either the forwards or rearward direction one of the cleaning bars is rotating against the direction of travel, this action tends to lift carpet pile and increase the debris and dust collection from the surface being cleaned. The action of contra rotating cleaning bars orientated close to one another creates an entrained airflow directed into the debris collection reservoir 10 of the product. The entrained airflow into the product is beneficial when using the product on smooth hard surfaces allowing fine dust particles and hair to be propelled into the debris collection reservoir and not to be blown away from the unit.

Drive motors 12 are positioned above the debris path to the debris collection reservoir preventing clogging of the motors or drive mechanism. The front cleaning bar 7 is driven from a given distance along its length via a toothed pulley with splined shafts protruding from each side of it, a toothed belt connects to the motor and is contained in a shroud 13 moulded from a plastics material. The cleaning bar 7 comprises of two shorter cleaning bars with splined holes in each to engage with the splined shafts of the drive pulley and provide rotational drive to each side of the cleaning bar. Removal of each side of cleaning bar 7 for periodic cleaning and removal of entangles hair or debris is performed by unlocking a bearing cap 14 at each end of the head unit. Each side of the cleaning bar 7 can then be removed along its axis. Removal of the bearing caps 14 can be made by rotating or unclipping them either by hand or using a removal tool. This arrangement of a split cleaning bar enables the cleaning bristles to be in close proximity to each side of the head unit thus providing the device to clean close to walls, skirting boards and furniture.

Drive to the rear cleaning bar 8 is via a toothed pulley 20 that incorporates a protruding splined drive shaft from one side to provide rotational drive to the rear cleaning bar 8. Removal of the rear cleaning bar 8 for periodic cleaning and

removal of entangles hair or debris is achieved by unclipping the sole plate 19, then tilting and extracting the cleaning bar from the splined drive shaft. The cleaning bars 7 and 8 are arranged such that the drive systems powering them 13 and 20 do not line-up front to back along the product, this ensures that the non bristled portions of the cleaning bars where the drive systems are prevent any missed areas on the surface being cleaned.

The lower handle assembly pivots on the head unit about its connection point 16, rollers 15 are positioned ahead of the handle pivot point 16 and wheels 17, are positioned behind the handle pivot point. This arrangement of handle pivot 16, wheels 17, and rollers 15 prevents any tendency for the leading edge of the head unit to dive into, or lift away from the surface being cleaned.

Part of the lower handle assembly is a rotating steering joint 18 set at an angle from the longitudinal axis of the tubular portion of the handle 5 assembled into it. When the upper portion of the handle 4 is rotated about its axis the angled steering joint causes the lower portion 3 and head unit 1 of the product to twist, providing a steering action.

The handle mechanism 16 and rotating joint 18 attached to the head unit of the device may incorporate an airflow passage through them to allow the addition of a vacuum and debris reservoir assembly (not shown) to be attached to the handle tube 5 for additional fine particle cleaning. The vacuum tube terminates in the head unit in a horizontal cavity 19 between the two cleaning bars with access holes or slots for air flow to a vacuum unit. A vacuum and debris reservoir assembly (not shown) mounted on the handle may incorporate the rechargeable battery pack, fuel cell or corded mains attachment to power the overall device. The vacuum and debris reservoir assembly maybe removable from the handle and when separated from the handle of the main assembly be used independently to clean upholstery, curtains etc.

The steering mechanism can incorporate a sprung locking strut that interacts with the rotating joint 16 on the head and is driven from the pivoting angle joint 18. The angle at which the lock is activated can be changed by the design of the geometry and is not limited to a single lock position. For example when the handle is rotated fully forwards about the pivot on the base unit, as shown in

Figure 1 the sprung locking strut activates to restrain the angled steering joint 18 in its centre position. When the handle is tilted rearwards when using the product as shown in Figure 4 the steering lock is disengaged allowing the steering joint 18 to rotate freely between its end stops. Incorporated into the lower handle housing is a removable rechargeable battery pack 6, that can be recharged when it is attached to the product and connected to a mains power supply (not shown) or when the battery pack 6 is removed from the product and connected to a mains power supply (not shown). As an alternative to the rechargeable battery pack the device could be mains or fuel cell powered. A switch 23 is mounted to the upper handle 4 to operate the device. This switch can be used to turn the product on and off and also change settings for different surface cleaning situations e.g. hard floors and carpet. The electrical cables travel from switch 23 down through the handle tube 5 to connect to the power source 6, through the rotation joint 18 and into the lower handle 16 before exiting into the drive motors mounted in the head unit 1.

The removable debris collection reservoir 2 can be detached from the head unit by depressing a release button 21. The debris reservoir 2 may have an automatic mechanical closing door system (not shown) operated by removal of the debris reservoir from the head unit to prevent spillage of collected debris. Alternatively the debris reservoir release button 21 may act as the debris reservoir door opening/closing feature when it is removed from the head unit. The debris reservoir 2 may incorporate a safety cut-out switch either electrical or mechanical to prevent the cleaning bars being activated when the debris reservoir is removed.