GB2563083A - Rear attendant standing platform for a manual or self propelled wheelchair adapted with a battery powered propulsion system - Google Patents

Abstract

A platform fitted to the rear of a wheelchair comprises a platform 3 attached to the wheelchair by two metal tubes 4, 5. Three or more wheels are fitted to the underside of the platform, while the upper surface is non-slip. The tubes have pivot points (2, 6, fig 10) which allow the platform to be folded up to rest on top of the battery 1 or against the back of the wheelchair. The metal tubes are fitted into tubes (3, 4, fig 10) attached to the frame of the wheelchair, with a length adjustment point. The platform may be removed from the chair by sliding the tubes 4.5 out of the length adjustment tubes.

Description

Rear attendant standing platform for a manual or seif propelled wheelchair adapted with a battery powered propulsion system.

DESCRIPTION

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to wheelchairs such as for handicapped or chair-bound individuals, and more particularly to the type wherein the chair and human occupant would cause the wheelchairs forward and reverse movement and steering of the wheelchair by the turning with their hands of 2 large large wheels 1 on each side of the wheelchair known as a self-propelled wheelchair. It also relates to wheelchairs with smaller wheels at the back which rely on an attendant or helper to push and steer the wheelchair with the human occupant seated In it, in particular those wheelchairs where the wheelchair has been adapted by adding a battery powered propulsion system, whose forward and reverse movement and speed Is controlled by the attendant or helper at the rear of the wheelchair, to make moving the wheelchair over a distance less strenuous for the attendant or helper.

The wheelchair may or may not be capable of folding for storage or for transport in a vehicle.

For several decades now, and with good success, battery powered propulsion wheelchairs have been in use and modem powered wheelchairs have substantial power and range on a single battery charge.

However, when a battery powered propulsion system wheelchair is controlled by an attendant or helper walking behind the wheelchair, there are drawbacks to the method. Such systems are capable of travelling at a speed equal to or greater than a fast walk, which in itself can be strenuous or stressful for the attendant walking behind the wheelchair due to rate of travel or distance travelled especially if the attendant or helper is not skilled in using the speed control.

By way of example if the attendant or helper was taking the individual in a battery powered propulsion wheelchair to the local town for shopping the route it takes may require half a mile or more along pavements or through parks just to arrive at the town which in itself can tire the attendant or helper who has to walk the same distance and the attendant or helper could become physically stressed due to the rate of travel or distance travelled which is a problem. Then the return journey would have the same problem but compounded if the attendant or helper is by then stressed or physically weakened.

in any event the attendant or helper may themselves be unfit or in a condition that walking great distances is detrimental to them seif and their well-being.

A platform could be fixed to the rear of the wheelchair with wheels underneath the platform with the platform joining to and becoming an integral part of the wheelchair. Some prior inventions do this and some allow the platform to be hinged up 90 degrees when not in use. However this in itself has inherent problems. A wheelchair is designed so that the centre of gravity is determined by the manufacturer during the design stage to be in the optimum place for each design of wheelchair.

If the centre of gravity is altered by adding a platform where the weight and mass of the platform and wheels to the rear of a wheelchair is fixed by rigid means the centre of gravity is altered and the wheelchair is likely to be out of balance and could tip backwards or sideways, more so when going uphill or climbing ramps or when moving along a pavement or surface that has a slope from the one side of the pavement to the opposite kerb edge side. This problem would be exacerbated by placing what could be a heavy person onto the platform, whose weight would be added to the rear of the wheelchair in a downwards direction.

SUMMARY OF THE INVENTION

The present invention solves the above described problems of an attendant or helper controlling a battery powered propulsion wheelchair by providing a platform which may be made from wood or injection moulded plastic on which the caregiver or friend may stand and also be transported simultaneously by the battery powered propulsion wheelchair.

The platform, in a preferred embodiment on which the attendant or helper stands has on its underside at least 3 or 4 or more wheels. For 4 wheels 1 would be fitted in each corner of the platform whilst for 3 wheels 1 wheel in each rear corner furthest from the wheelchair and a third underneath the front edge of the platform nearest to the wheelchair located centrally to the width of the platform. The wheels can be of the skateboard type or of the individual rigid or swivel type and they can also be bigger for rougher terrain. The topside of the platform would ideally have an anti-slip surface. The platform may be adapted so that the width may be altered to suit different widths of wheelchair but may also be of a fixed width. With the four wheels on the underside, the platform is more stable than with 3 wheels. This will make the platform extremely stable and safe for the attendant or helper to stand on regardless of the attendant or helpers condition or weight. No balancing is required.

The platform on which the attendant stands is attached to the wheelchair frame with a metal tube fixed on the underside of each side edge of the platform and extending to the wheelchair frame. Along each tubes length are two (2) pivot joints. Thus each bar is made of 2 separate parts joined along its length to pivot at 2 places. Each joined tube length tube has a built in quick-release point to separate the tubes and platform in there entirety from the wheelchair in an easy and quick manner. Both left and right connecting tubes have an adaptation and means to alter there length to allow the platform to be nearer or further away from the actual wheelchair. On each tube on the pivot joint nearest to the platform a safety wheel is located the purpose of which is to stop the metal tubes from scraping on the ground in a destructive manner when moving over rough or uneven ground.

At the furthest point on the tube from the platform that joins the tube to the actual wheelchair framework the pivot join may be created directly to the wheelchair by means of corresponding pivot holes in the wheelchair frame and platform connecting tubes end to allow for a pin or bolt to pass through the wheelchair frame and through the platform connecting tube at the same location to join the 2 together. There may alternatively be a special adapter in the form of a clamp that can an be attached/ciamped to the wheelchair framework onto which the platform tube can be connected in the same way. The 4 pivot joins on the platforms connecting tubes each have up to but not limited to 180 degrees circle of upwards and downwards movement allowing the platform to be lifted upwards and downwards in a circular motion to fold back on itself enabling the platform to rest on a ledge at the rear of the battery pack of the propulsion unit or moved further back in a rotation to rest the platform so that it lays on top of the battery pack with the platform wheels facing upwards at the top. Thus the attendant or helper may lift and place the wheeled platform out of the way if he or she decides to control the wheelchair when walking for any short intervals during the journey, such as crossing a road, going over rough terrain or moving in a congested area by way of examples.

For longer periods the pivot joins on the connecting tubes allow the platform to be folded up and back to rest against the back of the wheelchair at a height the full length of the tubes and be held in place by straps or hooks or elastic luggage straps of the bungee type. In this position the centre of gravity of the wheelchair would be as the wheelchair manufacturer intended when designing the wheelchair.

On a self-propelled type of wheelchair the battery powered propulsion unit can be designed to be removable thus allowing the user to move the wheelchair themselves and with the platform located and held in its highest position, the centre of gravity of the wheelchair it would be as the wheelchair manufacturer intended when designing the wheelchair.

When the attendant or helper is standing on the platform which has 3 or 4 wheels, there is no increased downward pressure or weight on the rear of the wheelchair due to the pivot joins which cause the platform to be towed along rather than carried which is more efficient for the life of the battery than having the attendant or helpers weight added to the downward weight of the wheelchair. The battery powered propulsion wheelchairs speed and forward/reverse options would be controlled from the rear of the wheelchair by the attendant both when walking behind the wheelchair on when standing on the platform. Also due to the 3 or 4 wheels and pivot action of the tubes, the platform will always remain stable and level regardless of the movement of the wheelchair. If the wheelchair lifts at the front, the attendant platform will not follow suit.

Whilst it is relatively easy to control a wheelchair propelled by a motor with a platform to stand on at the rear in a straight line it is usually impossible for an attendant standing on a platform connected to a wheelchair which is driven with a motor to turn the wheelchair itself independent of the platform the invention is more suited to travelling in a straight line however with the platform located in one of the rest positions the attendant can easily steer the wheelchair around comers, in any event a passenger in a wheelchair controlled by a battery motor at the rear with the person controlling toward movement would not like to be thrown around comers, especially in a crowded location, therefore stepping off of the platform for corners should be preferable. It's primary use is for long distance of distance. Also crossing roads or going up or down a kerb would be dangerous with the attendant or helper standing on the platform controlling the wheelchair with its battery powered propulsion system and it would be more desirable in this or similar situations for the attendant or helper to step off of the platform and lift the platform info one of its non-use positions and to have control of the battery powered propulsion wheelchair with their feet firmly on the road or pavement.

The connection tubes may also have means to connect a spring or springs to the connecting rods to lift the platform off of the ground surface when the helper or attendant steps off of the platform. One or two springs could alternately or as well as be located within the connecting tubes to exert an upwards pressure to lift the connecting tubes and platform dear of any ground contact when the attendant or helper steps off of the platform. This concept is such that numerous structural arrangements can be used to achieve the same basic end results and thus the “invention” is not to be restricted to the specific details given in this disclosure.

My attendant or helper platform is intended to be inexpensive to make or purchase and easy to mount to a wheelchair; convenient to use for riding upon by an attendant or helper; readily storable on the wheelchair when not used as a riding platform with the stored position allowing normal standard use of the wheelchair by both the chair occupant and attendant who may be standing behind the chair but on the ground. It also designed to be easily removabie if needed.

My attendant or helpers platform is also intended to be safe to use, having a non-slip standing surface, and being conveniently and properly located relative to the wheelchair, the wheelchair wheels, and two sturdy handies on the upper rearward portion of the wheelchair above the platform and useful by the attendant or helper to stabilize him or herself when riding and controlling the wheelchair from the platform. My attendant or helper platform combination with a powered wheelchair concept is such that numerous structural arrangements can be used to achieve the same basic end results and thus the “invention” is not to be restricted to the specific details given in this disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 shows a passenger seated in a self-propelled wheelchair with a battery powered propulsion system fitted and a control unit fitted on the right handle.

Fig. 2 shows a passenger seated in a attendant or helper wheelchair with a battery powered propulsion system fitted and a control unit fitted. A platform is located at the rear of the wheelchair with wheels on the underside of the platform. The platform is connected to the lower rear frame of the wheelchair with two joining tubes. The platform having a non-slip surface on the topside and underneath a handle for lifting.

Fig. 3 shows the underside of the platform having 4 sets of wheels of the skateboard type.

Fig. 4 shows the underside of the platform having 4 sets of wheels of the single individual type.

Fig. 5 shows the topside of the platform with the wheelchair connecting arms each side and platform having a non-slip surface. The platform having a non-slip surface.

Fig. 6 shows a close-up of the connection tubes quick-release clip and overall connection tubes length adjustment mechanism.

Fig. 7 shows the inner tube of the platform connecting arms, quick-release clip and connection tubes length adjustment mechanism.

Fig, 8 shows a side view of the platform connected to the wheelchair connection tubes.

Fig. 9 shows the invention aligned to be fixed to the wheelchair frame.

Fig. 10 shows the invention fixed to the wheelchair frame by means nuts and bolts to form a pivot join at the paint of joining.

Fig. 11 shows an exploded view of the components of a special clamp to be fixed to the wheelchair frame having a protruding tube to allow the clamp to be fixed both horizontally or vertically on the wheelchair frame which purpose is to connect the invention to the wheelchair without having to drill holes in the wheelchair.

Fig. 12 shows a non-exploaded special clamp to be fixed to the wheelchair frame having a protruding tube to allow the clamp to be fixed both horizontally or vertically on the wheelchair frame which purpose is to connect the invention to the wheelchair without having to drill holes in the wheelchair.

Fig. 13 shows the invention fixed to a horizontal section of the wheelchair using the clamp.

Fig. 14 shows the invention fixed to a vertical section of the wheelchair using the clamp.

Fig. 15 shows a first resting place for the platform when lifted from the ground.

Fig. 16 shows a second resting place for the platform when lifted from the ground with the platform held aloft with 2 elastic bungee type straps.

Fig. 17 shows an exploded view of a method of making the platform width alterable utilizing a simple sideways sliding function of 2 halves of the platform.

Fig. 18 shows a view of a method of making the platform width alterable utilizing a simple sideways sliding function of 2 halves of the platform.

WITH REFERENCE NOW TO THE DRAWINGS FOR A MORE DETAILED DESCRIPTION.

The present invention from one viewpoint is a wheelchair adapted or manufactured to be propelled by a battery powered motor that has its forward and reverse motion and sped controlled by an attendant who stands on a platform fitted to the rear of the wheelchair. The platform having means to be lifted and placed in at least one resting place when not in use.

Fig. 1 shows a passenger seated in a self-propelled wheelchair with a battery powered propulsion system (1) fitted and a control unit (2) fitted on the right handle. Although the type of battery powered propulsion system shown is used to illustrate the invention, the invention is not limited to this type of battery powered propulsion system.

Fig. 2 shows a passenger seated in a attendant or helper wheelchair with a battery powered propulsion system (1) fitted and a control unit (2) fitted on the right handle. A platform ( 3 ) is located at the rear of the wheelchair with 4 sets of wheels, the wheels and platform resting on the ground. The platform is connected to the lower rear frame of the wheelchair with two joining tubes (4) and (5) fitted as is the purpose of this invention. The platform having a non-slip surface (3) on the topside and and underneath a handle (6) for lifting of the platform.

Fig. 3 shows the underside of the platform having 4 sets of wheels said wheels being of the skateboard type.

Fig. 4 shows the underside of the platform having 4 sets of wheels said wheels being of a single individual type.

Fig. 5 shows the topside of the platform with the wheelchair connecting arms each side and platform having a non-slip surface.

Fig. 6 shows a ciose-up of the connection tubes quick-release clip and overall connection tubes length adjustment mechanism whose functions are explained in Fig. 7 and Fig 8 with corresponding numbers for clarity of explanation.

Fig. 7 shows the inner tube (9) used for quick release and for altering the length of the joined inner and outer tubes collectivity connected (9) it has a series of holes along its length that are evenly spaced apart. These holes pass through the whole tube allowing a pin to pass through the tube. Each section part of the outer tubes that slide over and surround the inner tube also have one corresponding hole that passes through the whole outer tube. Aligning the outer tube hole with an inner tube hole and passing a locking clip through both the outer and inner tubes in the same location will lock the inner and outer tubes together at that point. Thus the locking pin nearest the pivot join of the tube with the wheelchair can be removed so the whole device can be detached allowing the wheelchair to be folded or stored. The other locking pin can be removed to allow the outer tube to be slid along to expose more of the inner tube and align another of the inner tubes lock pin holes with the corresponding holes on the outer tube wherein the lock pin can be re-inserted causing the tubes in there entirety to be longer.

Fig. 8 is a side view ot the platform (1) showing the wheelchair connection tubes (2) with platform joined on fop of the connecting tubes at the rear of the connection tubes. The platform has on its underside wheels (3a) and (3b) to support the platform on the ground surface. The first section of the connecting tube (2) is joined to a second tube (7) via a bracket (4) with a pivot joint (6) allowing the second tube and platform to pivot upwards or downwards in an arc of over 90 degrees in each direction with each other. At this join a wheel (5) stops the tubes from scraping the ground if the platform is rotated or lifted upwards or the ground is uneven. A third tube (9) is fitted inside the second tube (7) and inside a third tube (13). The inner tube (9) is held in a locked position in tubes (7) and (13) by having holes that align with similar holes in tubes (7) and (13). A pin is fitted to pass through the outer tube (7) and also through the inner tube (9) at a point (8) and lock the tubes at this point. Another pin passes through the outer tube (13) at point (10) and through the corresponding holes in the inner tube (9). The inner tube (9) section inside the outer tube (7) has a series of holes along its length (hidden) so can be moved outwards or inwards from inside the outer tube (7) thereby increasing or decreasing the overall length of the connecting tubes, the section of the inner tube that passes into outer tube (13) has just one hole that aligns with the hole through the outer tube at point (10) for a pin to pass through at point (10) to lock the inner and outer tubes together at point (10). it is this pin at point (10) that is removed to disengage the whole of the unit from the wheel chair if needs arise. The outer tube (13) has a bracket (11) at its end with holes (12) for nut and bolts to pass through to join the unit to a wheelchair frame through which corresponding holes exist or have been made The locking pin passing through the holes (12) and the wheelchair frame cause the connection arms to have a second pivot where the connecting arms and wheelchair frame meet. While this is one means of connecting the unit to a wheelchair that is the purpose of this invention, there is also a special clamp shown in other drawings that can be clamped to a horizontal or vertical tube of the frame of the actual wheelchair to which the nut and bolt to join the bracket (12) can be bolted. This avoids having to drill a hole through the wheelchair frame.

Fig. 9 shows the invention aligned to be fixed to the wheelchair frame with a nut and bolt that will pass through a hole through the wheelchair frame (2) and corresponding hole (1) through the tube and also another through the wheelchair frame (3) and corresponding hole through the wheelchair frame (4).

Fig. 10 shows the invention fixed to the wheelchair frame (3) and (4) by nuts and bolts (2) and (6) passing through the connecting arms brackets (1) and (5) at points (2) and (6) and the aligned wheelchair frame holes to form a pivot join at the point of joining.

Fig. 11 shows an exploded view of the components of a clamp to be fixed to the wheelchair frame to join the connecting tubes from the platform to the wheelchair. The body of the clamp (1) having 4 sides consisting of two ends and two sides and a top surface, but no base or bottom face. Four bolts (11) pass through the top face of the clamp bolt holes (2), the holes position corresponding to four bolt holes in the clamp base plate (10) to lock and tighten the body of the clamp to the baseplate. All four sides of of the clamp body have a half circle section ((3) and (4) shown) cut away to allow the clamp body to be located horizontally or vertically onto the frame of a wheelchair. The clamp baseplate (10) would be located in the same place but on the opposing side of the frame of the wheelchair and the two halves would be locked together with the bolts (11) and nuts (12) to make an extremely tight fix to the frame. The body of the clamp has a protruding tube (5), the protruding tube having a hole passing through vertically (6) from top to bottom and and a hole passing through horizontally (7) from side to side. A nut and bolt (8) and (9) would be used to connect and hold the platform connecting tubes end brackets in place on the protruding tube of the clamp body to join the two and form the second pivot join as described in the summery of the invention. Dependant on if the clamp was fixed to a horizontal or vertical section of the wheelchair frame would decide which of the holes (6) or (7) in the protruding tube (5) would be used for the purpose of the invention. By turning the clamp baseplate (1) 90 degrees in a circle and changing the orientation of the v-fold to the protruding tube, the same clamp could be used for both horizontal or vertical usage and also for both left and right platform connection tubes.

Fig. 12 shows an assembled clamp to be fixed to the wheelchair frame having a protruding tube to allow the clamp to be fixed both horizontally or vertically on the wheelchair frame which purpose is to connect the invention to the wheelchair without having to drill holes in the wheelchair. The clamp may differ from that shown by way of example but its purpose would be the same.

Fig. 13 shows the invention fixed to a horizontal section of the wheelchair using the clamp in a horizontal position..

Fig. 14 shows the invention fixed to a vertical section of the wheelchair using the clamp in a vertical position.

Fig. 15 shows a first resting place for the platform (2) when lifting the platform from the ground for storage.

The platform would be lifted using the handle on the underside of the platform and turned back on itself utilising the rear pivot points, then lowered to rest the platform (2) onto the battery pack (1) of the battery powered propulsion system.

Fig. 16 shows a second resting place for the platform when lifting the platform (1) upwards and inwards to rest against the back of the wheelchair seat (4). ground with the platform held in place with 2 elastic bungee type straps (2) and (3) fixed to the wheelchair frame and looped around the platform wheels. If the platform connection arms are of a length to allow the platform to move back against the wheelchair seat back and the movement is over 90% from the horizontal plane then the platform will require no support by way of strap or hook or clip to stay rested against the wheelchair seat back.

Fig. 17 shows an exploded view of the components of an attendant or helper width alterable platform, comprising two halves (1) and (2) of the platform each with wheels front and rear. Each having 2 slots (3) and (4) and (5) and (6) passing through the platform. Atop plate (7) having 4 holes and a bottom plate (8) having 4 holes that align with the slots in the platform halves (1) and (2) and also with the 4 holes in plate 7.

A handle (9) is fitted on the underside of the bottom plate (8) and fixed with 2 screws (10) that pass through the bottom plate into threaded slots in the handle.

Fig. 18 shows the assembled attendant or helpers platform complete with the wheelchair connecting tubes. A anti-slip surface has been applied to the 2 halves of the platform and also to the surface of the top plate. By loosening the 4 nuts and bolts the 2 halves of the platform can be moved apart or closer together then locked in place by tightening the 4 nuts and bolts. This allows for adjustment of the overall width of the platform. It is envisaged that other means may be used to allow for the platform width to be alterable so the invention is not limited to the method shown.

My invention has been described above in great detail by way of example, and changes from that described and shown can be made within ihe true scope of the invention which should be determined by the broadest possible and reasonable interpretation of my description and drawings.

Claims (10)

CLAIMS (10) I claim: A platform, comprising;

1. An attendant standing platform for a motorized wheelchair which comprises a platform base having a top side and an underside, and at least 3 wheel assemblies mounted to the underside of said platform base, the said platform having a protruding arm from the rear of the said platform on the left side of the said platform, and the said platform having a protruding arm from the rear of the said platform on the right side of the said platform, the protruding arms comprising a connected plurality of metal tubes.

2. The device of claim 1, wherein the first tube of the arms connected plurality of metal tubes protruding from the platform have an extending bracket on the left side end of the first tube and an extending bracket on the right side end of the first tube, corrisponding aligned holes through the brackets at the brackets end, a second metal tube, a hole formed through the second metal tube at the tubes end nearest to the said platform, a nut and bolt or pin adapted to extend completely through the bracket holes and through the corrisponding holes on the second metal tube to form an upwards and downwards pivot joint, said nut and bolt or pin adapted to also pass through a wheel attached at the pivot joint, said wheel being attached in a vertical plane to the pivot joint of the first and second metal tubes of the protruding arms, a third metai tube having the same outside diameter as the internal diameter of the first and second metal tubes of the extending arms, the said third metai tube having a series of equally spaced holes along its length, said holes passing though the whole tubes width, the said third metal tube adapted to slide inside the second metai tube, a removable retaining pin adapted to pass completely through holes at the end of the second metai tube and completely though one of the corrispondingiy aligned holes in the third smaller inner metal tube, the said third metai tube extending outwards from the inside of the second extending metai tube, a forth metal tube whose internal diameter is the same as the exturnai diameter of the third metai tube, said forth metai tube having at one end a hole passing though the whole tubes width, the said forth tube adapted to slide over the third metal tube, a removable retaining pin adapted to pass completely through boles at the end of the forth metai tube and completely though one of the corrlspondingiy aligned holes in the third smaller inner metai tube, the said forth metai tube having at its other end an extending bracket on the left side end of the said forth tube and an extending bracket on the right side end of the said forth tube, the said brackets adapted with corrispondingiy aligned holes through the brackets at the brackets end, a nut and bolt or pin adapted to extend completely through the bracket holes and through corrisponding holes in the metal frame of a wheelchair frame at the rear of the wheelchair, said bracket, nut and bolt or pin forming a pivot join between the forth metai tube and the wheelchairs metai frame.

3. The device of claim 1 ,the said platform having a non-slip surface on its top side.

4. The device of claim 1, where a handle is mounted on the underside of the said platform at the rear of the platform, being centrally located across the width of the platform.

5. The device of claim 1, wherein at least 3 wheel assemblies are mounted on the underside of the said platform, being one wheel assembly in each corner of toe rear underside of the said platform, and a third wheel assembly mounted at the front underside of the platform, centrally located.

6. The device of claim 1, where in least 4 wheel assemblies are mounted on the underside of the said platform, being one wheel assembly in each comer of the front underside of the said platform, and one wheel assembly in each comer of the rear underside of the said platform.

7. The device of claim 1, wherein the platform base is fabricated from a member consisting of metal, plastic, glass fiber, or plywood.

8. The device of claim 1, wherein a clamp comprising two parts, part one a square metal box having four sides, and a top surface, wherein the width and length of the said box each being such to allow clamping bolts to pass through the top box and baseplate of the clamp on two sides of a wheelchair frame tube, having clearance between bolts and wheelchair frame section, and whereas the opposing sides of the said box each having a semi-circle cutaway, said semi-circle cutaways aligning with each others opposing sides semi-circle cutaway, the diameter of the said semi-circle cutaways having the diameter of the standard diameter of the metal tube that makeup the frame of a standard wheelchair, the said metal box having on its topside four holes through the top plate, located one in each comer, said metal box having on one of its ends a fixed protruding metal tube, said protruding tube diameter being equal to the diameter of metal tube four on the protruding arms of the platform, said protruding tube having a hole through it from side to side, and a hole through it from top to bottom, a nut and bolt or pin adapted to extend completely through the bracket boles of metal tube four on the protruding arms of the platform and the corrispondingly aligned holes on the clamp box protruding tube to form an upwards and downwards pivot joint between the clamp protruding tube and platform projection arm bracket, a metal plate having the length and width dimensions of the length and width dimensions of the clamp box, said metal plate having four holes through it from top to bottom, said holes positions aligning with the four holes through the clamp box top, the said plate having a v-foid located centrally along is length from one side edge to its opposing side edge the v-foid width at the top being more than the width of the diameter of the standard diameter of the metal tube that makeup the frame of a standard wheelchair, four nuts and bolts join the top clamp and bottom plate tightly together with the metal frame tube of a standard wheelchair frame sandwiched tightly between the top clamp and bottom plate.

9. The device of claim 1, wherein the platform base comprises a left half and right half of the said platform, each half seperate from the other, and each half having at least 2 wheel assemblies mounted to the underside of that half of the platform, the wheel asembiies being located to the outside edge of each half platform at front and rear of said half platform, both said half platforms having two or more elongated slots passing through the said halt platforms, whereas third and forth componants have corrisponding holes passing through them, said holes aillgnlag with the elongated slots in the first two half platforms, nuts and bolts passing first through the top third component, then through the midway half platfoms elongated slots, then through the bottom forth componant, the two half platforms being sandwiched between the third and forth componant, whereas loose nuts and bolts allow sideways movement of the two half platforms increasing or decreasing the overall combined width of the said two half platforms, whereas tightening of the nuts and bolts locks the two half platforms into a fixed position and overall combined width.

10. The device of claim 1, wherein the platform may be lifted at its rear in an upwards and forwards direction, utilising pivot hinges in the platform projecting arm assemblies towards the back of the seat back on a wheelchair, to a position whereby said platform can be rested in multiple positions for storage away from the ground surface, whereas the said wheelchair has means to support and hold in place said resting platform.

My invention has been described above in great detail by way of example, and changes from that described and shown can be made within the true scope of the invention which should be determined by the broadest possible and reasonable interpretation of my claims.