Wheelchair shuttle

Abstract: The invention is concerned with a greatly improved, compactly dimensioned, three-wheeled wheelchair shuttle (1) with a box shaped interior (4) and a flat floor panel (8), the rear side of which can be closed by a folding ramp construction (24). The aforementioned floor panel (8) can, with the aid of the rear wheel (3) mounting construction (14) and together with the aforementioned ramp construction (24) pivoted on the rear of the wheelchair shuttle (1), be lowered to the road surface (28) enabling a wheelchair (6) to enter the wheelchair shuttle (1) from the rear. The movement of the mounting construction (14) for the rear wheels (3) is achieved using special, high quality suspension elements (20) which are controlled by a compressor and its associated components. The wheelchair shuttle (1), in accordance with the invention, has separate rear wheel drive propelled by a battery powered electric motor.

Description: The invention is concerned with a device constructed as a self-propelled steerable vehicle for one person, who would normally be invalided by a leg and/or hip condition, the driver's seat of which may be a wheelchair, whereby the aforementioned wheelchair may be driven onto the vehicle's bottom plate, the so-called floor panel, that for this purpose is pivoted, thereby providing an up and down movement in relation to the road surface, and which vehicle is equipped with at least one front wheel and two rear wheels, at least one of which may be driven. Such a device or vehicle is known front the European patent application number 0 251 136 from the applicant Yamaha Motor Co. Ltd., 2500 Shingai, Iwata-shi Shizuoka-ken, Japan. This application is concerned with a low mounted box shaped vehicle, the so-called flat floor panel of which is pivoted and may be lowered to the road surface, during which movement the rear side closing construction is simultaneously opened downwards, enabling a wheelchair to be driven in from behind. With the aid of a compressed air cylinder the movement of the floor panel and the rear closing construction is accomplished by a number of bars and the rear wheel mounting. The boxed shaped vehicle has a front panel and left and right side-panels. The box shaped vehicle is equipped with a steerable front wheel and two driven roar wheels. The rear wheels are driven together by either an electric motor or a petrol engine. The raising and lowering of the previously mentioned flat floor panel is made possible with the aid of a pneumatic cylinder and pump which has two possible positions, namely the lowering or external air pressure position, and several atmospheres overpressure or the maximum over pressure position. The closing rear side is a U-shaped construction that is simultaneously operated by the aforementioned pneumatic cylinder via a pivoted bar. When the air pressure in the pneumatic cylinder is released, the rear wheels move upwards in their mounting construction, simultaneously turning the U-shaped rear construction downwards onto the floor panel this enabling the wheelchair to driven into the box-shaped vehicle from behind. Subsequently, the air pump is switched to the pneumatic cylinder and the rear wheels are pushed downwards and the U-shaped rear construction simultaneously turns upwards behind the rear wheels of the wheelchair, following which the invalid's journey in the wheelchair may begin. It has appeared from tests that the previously described familiar vehicle for taking up and transporting an invalid person in a wheelchair, also a type of wheelchair shuttle, has a great number of drawbacks, through which this vehicle would appear less suitable for easy and comfortable use by a handicapped person. In the first place the second point of the wheel mounting construction, pivoted on the aforementioned compressed air cylinder, is connected to the vehicle's body frame. A compressed air cylinder is unsuitable for use as a suspension element as this cylinder has only two "fixed" positions, full pressure as the vehicle's operational pressure and the external air pressure for lowering the aforementioned floor panel. In brief, a compressed air cylinder as such is not designed for use as a suspension and/or damper element, but only for effecting the mechanism's two positions, which two positions are also fixed. Any form of comfortable suspension during the journey is therefore absent. Furthermore, the familiar vehicle has no provisions to prevent the rolling back of the invalid occupied wheelchair, and the U-shaped rear closure is turned up just above the floor panel in the drive-on position, causing an extra, serious resistance when driving onto the vehicle. This resistance has proved difficult for the invalid in his wheelchair to overcome. Moreover, there are no provisions to prevent the wheelchair moving during the journey, which could be extremely dangerous for the invalid in the wheelchair during a sudden or emergency stop. It can now also be said that driving a wheelchair onto the floor panel, which is relatively thick, is moderately difficult for the user. In order to alleviate the aforementioned drawbacks the device, in accordance with the invention under consideration, has been implemented as a self-propelled, steerable vehicle for an invalid person corresponding to the wheelchair shuttle named in the preamble of claim 1, constructed in a surprising manner for the user, and in such a manner that each rear wheel (3) is equipped with adjustable suspension elements (20) in front of the rear wheels (3) for lowering the floor panel (8) to the road surface (28), that this floor panel (8) is equipped with a folding ramp construction (24), which may be driven on by a wheelchair (6), that the folding ramp construction (8) is also equipped with means (9) to prevent the wheelchair (6) from rolling forwards, and additionally the locking into position of the wheelchair (6) in the mentioned vehicle (1) during a journey is assured by means of the raised folding ramp construction (24). Furthermore, in accordance with the invention, the device has now been developed to such a degree that each of the rear wheels may be independently driven by a power source. The advantage of this is that a compactly constructed wheelchair shuttle results, both as far as the length and width dimensions are concerned, the latter being reduced to a maximum of 1 metre. The driving power source is located in front of the rear wheel, resulting in the smallest width dimensions for the wheelchair shuttle. The device, in accordance with the invention, has been developed further in such a manner that the aforementioned mounting construction for the rear rear wheel consists of a triangular frame, pivoted in relation to the vehicle frame and forming the first rear angle of the base of the aforementioned triangular frame, the base of the triangular frame often being referred to as a swing-arm, the wheel mounting of which being located at the second angle on the base of the triangular frame, the top angle of the aforementioned triangular frame having a pivoted mounting for the adjustable suspension, the triangular frame having another pivoted mounting to a second point on the vehicle frame, the aforementioned folding ramp construction being operable by means of a specially shaped extension to the base of the swing-arm next to the wheel mounting on the triangular frame. The advantage of this being the formation of an extremely solid and wear-resistant mounting, providing a suitable manner for operating the folding ramp construction at the same time. Furthermore the device, in accordance with the invention, has been developed further in such a manner that the aforementioned triangular frames for the rear wheel mounting construction have been coupled together by means of a torsion bar between the first pivoted mountings at the rear angle of the base of the swing-arms. The advantage of this being that the undesirable rolling of the wheelchair shuttle when negotiating bends will be avoided. The device, in accordance with the invention, has then been developed further in such a manner that the axle located at the rear angle of the first pivoted mounting on the base of the swing-arm on the mounting constructions triangular frame has been equipped with a driving disc for the purpose of driving the rear wheel, and also for coupling the aforementioned separate power source to each rear wheel. The advantage of this being a highly efficient power transmission. Furthermore the device, in accordance with the invention, has been developed further in such a manner that the aforementioned adjustable suspension is adjustable in length and is of a type consisting of an inflatable bellows constructed around a shock absorber, and which shock absorber employs an existing system, such as a complete Ride Leveller Compressor System from Monroe, consisting of the following four groups of components: a compressor for making compressed air available; a relay with fuse for switching the compressors power supply; an operating panel with pressure gauge which indicates the pressure in the inflatable bellows constructed around the shock absorber; electric wiring and air lines. The advantages of this being that an extremely comfortable suspension system results, which has been excellently developed following an existing system and for which all components can he freely purchased with all the advantages of service, guarantee, etc. Furthermore the device, in accordance with the invention, has been developed further in such a manner that the aforementioned means of preventing the wheelchair from rolling backwards after driving on to the ramp incorporated in the floor panel, consisting of hollows in the floor panel at the location of the rear wheels, and the means for preventing the wheelchair from rolling forwards incorporated in the side panels, consisting of pivoted arms with a limited rotational angle, which may be fitted by hand in front of the wheelchair's rear wheel, and which arm construction only has to be adjusted once to the required wheelchair wheel size. The advantages of this being that once the wheelchair has been driven on to the floor panel by the invalid person it cannot roll backwards, and the prevention of the wheelchair shooting forwards during an emergency stop or when driving onto the shuttle too quickly. Then the device, in accordance with the invention, has been developed further in such a manner that the aforementioned ramp construction consists of a ramp, fixed on both sides to a pivoted bar construction equipped with a stop boss, fitted to the ends of the bars in the bar construction, which bar construction is operated by the aforementioned extension to the base of the swing-arm on the triangular frame for the wheel mounting, through which the ramp construction may be folded upwards and downwards, and when folded upwards effectively locks the rear wheels of the wheelchair, and when folded downwards together with the pivoted floor panel the device, in accordance with the invention, forms an extremely manageable ramp for the aforementioned wheelchair. The advantages of this being an extremely comfortable, reliable and manageable ramp construction, requiring virtually no maintenance. Then the device, in accordance with the invention, has been developed further in such a manner that the aforementioned pivoted bar constructions connected to one another consist of three special pivoted bars connected together, where the first bar is also pivoted at one end and fixed to the frame of the wheelchair shuttle, and where one point of the last or third bar is also pivoted at one end and fixed to the frame of the shuttle, where the middle or second bar is equipped with the aforementioned stop boss in front of the swing-arm extentsion, where the other pivoted points on the three bars have been fitted in a manner so that the bar construction remains in a so-called push-through position when the ramp panel is in the folded position The advantage of this being that rear wheels of the wheelchair are extremely effectively and reliably locked during any journey. Moreover, after the push-through position of the bar construction the swing-arm can move freely for the benefit of the wheelchair shuttle suspension. Then the device, in accordance with the invention, has been developed further in such a manner that the aforementioned power source is an electric motor, powered by a rechargeable battery. The advantages of this being no noise pollution or exhaust gas emission, thereby increasing comfort for the invalid user of the wheelchair shuttle. Then the device, in accordance with the invention, has been developed further in such a manner that the framework and the aforementioned floor panel have been manufactured from metal and that the remaining panelling, in accordance with the invention, may be of synthetic material, the aforementioned metal being steel or aluminium, and the aforementioned synthetic material being ABS. The advantages of this being the optimum use of materials in limiting the total weight, thereby further increasing the overall efficiency of the wheelchair shuttle. A further description is given below supported by illustrations of the wheelchair shuttle, in accordance with the invention, showing in: Fig. 1 a plan view of the device, the wheelchair shuttle, in accordance with the invention, to which the panelling has been fitted; Fig. 2 a side view of the device illustrated in Fig. 1 partially showing the rear wheel mounting construction; Fig. 3 a front view of the device, the wheelchair shuttle, in accordance with the invention, equipped with full panelling, mirrors, lighting, etc.; Fig. 4 a plan view of the device in accordance with the invention, from which the panelling has been removed and only the frame is visible; Fig. 5 a side view of the wheelchair shuttle in which the frame with rear wheel mounting, adjustable suspension, a schematic illustration of the folding ramp construction and a schematic illustration of the wheelchair; Fig. 6 a side view of the wheelchair shuttle in accordance with the invention, in which the floor panel has been lowered and the wheelchair user is driving on to the wheelchair shuttle; Fig. 7 a side view of the wheelchair shuttle in accordance with the invention, in which the wheelchair is positioned fully in the wheelchair shuttle and the floor panel is in the raised position; Fig. 8 a schematic side view of the rear wheel mounting construction of the device in accordance with the invention, the wheelchair shuttle, in connection with the bar mechanism for operating the folding ramp construction, showing the folding ramp construction in the lowered position; Fig. 9 a schematic side view of the rear wheel mounting construction of the device in accordance with the invention, the wheelchair shuttle, in connection with the bar mechanism for operating the folding ramp construction, showing the folding ramp construction in the raised, and therefore wheelchair locking position. In figure 1 a plan view of the wheelchair shuttle 1 is shown in operational condition, in accordance with the invention. It should be mentioned here that the frame tubing located behind the panelling has been illustrated with solid lines. In the preferential implementation the wheelchair shuttle 1 is equipped with one front wheel 2 and two rear wheels 3. The wheelchair shuttle 1 has a generally box-shaped interior 4, which can be opened at the rear by a folding ramp construction 5. As shown in figures 5 to 7 the interior can accommodate a wheelchair 6 with an invalid person 7. The wheelchair shuttle 1 has a flat floor panel 8 which can be lowered, in which hollows 9 (claim 9) have been made to prevent the wheelchair 6 from rolling backwards. In accordance with claim 10 the frame 10 has been equipped with means 11 to prevent the forward movement of the wheelchair. These particular means 11 are not illustrated but can be fitted in accordance with the claim in several variations. The front panelling 12 and the side panelling 13 are constructed from synthetic material and will be styled in accordance with the styling of an industrial designer. In figure 2 a side view of the wheelchair shuttle 1, in accordance with the invention, is shown in operational condition. In this figure the mounting construction 14 for the rear wheel 3 is illustrated. This concerns a triangular frame that is fitted to the frame 10 of the wheelchair shuttle 1 by a pivoting construction at 15, and is connected to the mounting construction of the other wheel by means of a torsion bar 16 in order to avoid any disturbing rolling when negotiating bends. In figure 3 a front view of the wheelchair shuttle 1 is shown. The entire construction appears as a modernly styled vehicle with bicycle type hand steering 17, and to ensure safety mirrors 18 have also been fitted. The front lighting 19 and the rear lighting 20 are also of great importance when using the wheelchair shuttle during the hours of darkness. In figure 4 a plan view of the wheelchair shuttle 1 is shown with the panelling removed. A plan view of the rear wheel mounting construction 14 is illustrated, whereby on the left hand side only the adjustable suspension element 20 is shown. In figures 5 to 7 the procedure for the mounting construction 14 for the rear wheels 3 is shown The mounting construction 14 consists of a triangular frame, the base frame tube of which is called the swing-arm 21, and is equipped on one side with the extension 22 for operating the pivoted bar construction 23 which in turn operates the folding ramp construction 24. The mounting construction 14 is fitted by a pivoted construction to the frame 10 of the wheelchair shuttle 1 at point 15. The axle for the rear wheels 3 is located at the angle of point 25. The adjustable suspension element 20 is fitted to the triangular frame by a pivoted construction at point 26. For practical reasons the adjustable suspension element 20 is the complete Ride Leveller Compressor System marketed by Monroe, whereby all necessary tested components are directly available and find good application in the wheelchair shuttle 1, in accordance with the invention. The adjustable suspension element 20 is mounted to frame 10 of the wheelchair shuttle 1 by a hinging construction at point 27. By varying the distance between 26 and 27 the rear wheels 3 can be raised (figure 6) or lowered (figure 7), through which the floor panel 8 can be lowered to the road surface 28 (figure 6) or raised to the driving position of the wheelchair shuttle 1 (figure 7). Figures 8 and 9 illustrate the operation of the mounting construction 14 in connection with the operation of the bar construction 23 which are connected together by a pivot construction. In figure 8, corresponding to figure 6, the folding ramp construction 24 has been lowered to the road surface 28 and the wheelchair 6 can drive into the wheelchair shuttle 1 from the rear. The bar construction 23 is described in detail in claims 11 and 12 a consists of three bars, namely, the first bar 29, the middle pivoting bar 30 and the third or last bar 31. The first bar 29 is mounted on the frame 10 of the wheelchair shuttle 1 by a pivot construction at point 32. The third or last bar 31 is mounted on the frame 10 of the wheelchair shuttle 1 by a pivot construction at point 33. The bars are also mutually connected by pivot constructions at points 34 and 35. When the extension 22 of the swing-arm 21 moves downwards (figure 8) the cam 36 travels with it, through which the bar construction 23 pivots and the folding ramp construction 24 moves upwards. The cam 36 is taken so far that the bar construction 'pushes through' at the end of its travel, and in doing so locks itself, effectively preventing it from clicking back. The bar 30 comes to rest against a stop boss 37. The bar construction 23 with the folding ramp construction effectively blocks the wheels of the wheelchair 6. In figures 8 and 9 the operation of the adjustable suspension element 20 can also clearly be seen. Furthermore, it can be stated that a preferential implementation has been described and that modifications are of course possible without departing from the extent of protection offered by this patent script.

Claims: Device implemented as a self-propelled steerable vehicle (1) for one person, who would normally be invalided by a leg and/or hip condition, the driver's seat of which may be a wheelchair, wherein the aforementioned wheelchair may be driven on to the vehicle's bottom plate, the so-called floor panel (8), that is pivoted for this purpose, therein porviding an up and down movement in relation to the road surface, and which vehicle is equipped with at least one front wheel and two rear wheels (3), at least one of which may be driven, wherein each rear wheel is equipped with a separate mounting construction (14), which simultaneously pivot upwards or downwards respectively in relation to the aforementioned floor panel with the aid of adjustable elements (20) in front of the rear wheels and in such a manner that the rear side of the aforementioned floor panel can be lowered to the road surface, that by means of the aforementioned adjustable elements the mounting construction for the rear wheels can be moved upwards, characterised in that the adjustable elements (20) are adjustable suspension elements (20), that the floor panel (8) is equipped with a folding ramp construction (24), which may be driven on by a wheelchair (6), that the folding ramp construction (8) is also equipped with means (9) to prevent the wheelchair (6) from rolling forwards, and additionally the locking into position of the wheelchair (6) in the mentioned vehicle (1) during a journey is assured by means of the raised folding ramp construction (24). Device as claimed in claim 1, wherein each rear wheel (3) may be separately driven by a power source. Device as claimed in claim 1, wherein the aforementioned mounting construction (14) for a rear wheel (3) consists of a triangular frame, which pivots in relation to the vehicle frame (10) around the first rear angel (15) on the base of the aforementioned triangular frame, whereby the base of the triangular frame is often referred to as the swing-arm, whereby the wheel mounting is located at the seconds angle (25) on the base of the aforementioned triangular frame and that the aforementioned adjustable suspension element (20) is fitted to the top angle (26) of the triangular frame by means of a pivoting construction, and coupled to the vehicle frame (1) by a pivoting construction, and that the operation of the aforementioned folding ramp construction is effected by means of the a specially shaped extension (22) on the base of the swing-arm (21) beyond the wheel mounting (14) on the triangular frame. Device as claimed in claim 3, wherein the aforementioned triangular frames for the mounting construction (14) for the rear wheels (3) are mutually connected by means of a torsion bar (16) between the first pivoting point (15) at the rear angle on the base of the swing-arm (21). Device as claimed in claims 2 and 3, wherein the axle located at the rear angle (25) of the first pivoted mounting on the base of the swing-arm (21) on the mounting constructions triangular frame has been equipped with a driving disc for the purpose of driving the rear wheel (3), and also for coupling the aforementioned separate power source to each rear wheel. Device as claimed in claim 1, wherein the aforementioned adjustable suspension elements (20) are adjustable in length and are of a type consisting of an inflatable bellows constructed around a shock absorber. Device as claimed in claim 6, wherein for the aforementioned shock absorber use is made of an existing system, such as the Ride Leveller Compressor System from Monroe. Device as claimed in Claim 7, wherein the aforementioned Ride Leveller Compressor System from Monroe consists of the following four groups of components: a compressor for making compressed air available; a relay with fuse for switching the compressors power supply; an operating panel with pressure gauge which indicates the pressure in the inflatable bellows constructed around the shock absorber; electric wiring and air lines. Device as claimed in claim 1, wherein the aforementioned means for preventing the wheelchair (6) from rolling backwards after driving on to the ramp incorporated in the floor panel (8), consisting of hollows (9) in the floor panel (8) at the location of the rear wheels (3) of the wheelchair (6). Device as claimed in claim 1, wherein the aforementioned means (11) for preventing the wheelchair (6) from rolling forwards incorporated in the side panels, consisting of pivoted arms with a limited rotational angle, which may be fitted by hand in front of the wheelchair's rear wheel, and which arm construction only has to be adjusted once to the required wheelchair wheel size. Device as claimed in claims 1 and 3, wherein the aforementioned ramp construction (24) consists of a ramp, fixed on both sides to a pivoted bar construction (23) equipped with a stop boss (36), fitted to the ends of the bars in the bar construction (23), which bar construction is operated by the aforementioned extension (22) to the base of the swing-arm (21) on the triangular frame for the wheel mounting (14), through which the ramp construction (24) may be folded upwards and downwards, and when folded upwards locks the rear wheels of the wheelchair, and when folded downwards together with the pivoted floor panel (8) the device, in accordance with the invention, forms an extremely manageable ramp for the aforementioned wheelchair (6). Device as claimed in claim 11, wherein the aforementioned pivoted bar constructions (23) connected to one another consist of three special pivoted bars connected together where the first bar (29) is pivoted at one end (32) and fixed to the frame (10) of the wheelchair shuttle (1), and where one point of the last or third bar, is also pivoted at one end (33) and fixed to the frame (10) of the shuttle (1), where the middle or second bar is equipped with the aforementioned stop boss in front of the swing-arm (21) extension (22), where the other pivoted points on the three bars have been fitted in a manner that the bar construction remains in a so-called push-through position when the ramp panel is in the folded position. Device as claimed in claim 2, wherein the aforementioned power source is an electric motor, powered by a rechargeable battery. Device as claimed in previous claims, wherein the aforementioned framework (10) and the aforementioned floor panel (8) have been manufactured from metal and that the remaining panelling, in accordance with the invention, may be of synthetic material. Device as claimed in claim 14, wherein the aforementioned metal is steel or aluminium, and the aforementioned synthetic material is ABS. Device as claimed in previous claims wherein the aforementioned lighting and directional indicators are fitted in accordance with the road traffic legislation applicable in the relevant country.

Inventors: VAN DOOREN ALEXANDER ANTONIUS, VAN DOOREN, ALEXANDER ANTONIUS ALOYSIUS
Applicants: DOOREN ALEXANDER ANTONIUS ALOY, VAN DOOREN, ALEXANDER ANTONIUS ALOYSIUS
Application year: 1992
Main classification: A61G3
IPC codes: A61G3, F02B1, B60G17, A61G5