EP0699067A1 - Lifting device for a stand-up wheelchair and wheelchair using same - Google Patents

Lifting device for a stand-up wheelchair and wheelchair using same

Info

Publication number
EP0699067A1
EP0699067A1 EP19950913214 EP95913214A EP0699067A1 EP 0699067 A1 EP0699067 A1 EP 0699067A1 EP 19950913214 EP19950913214 EP 19950913214 EP 95913214 A EP95913214 A EP 95913214A EP 0699067 A1 EP0699067 A1 EP 0699067A1
Authority
EP
Grant status
Application
Patent type
Prior art keywords
seat
structure
frame
device
part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19950913214
Other languages
German (de)
French (fr)
Other versions
EP0699067B1 (en )
Inventor
Gérard BOBICHON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Diffusion Consommateurs (idc) SA
INT DIFFUSION CONSOMMATEURS I
Original Assignee
INT DIFFUSION CONSOMMATEURS I
International Diffusion Consommateurs (idc) SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT OR ACCOMODATION FOR PATIENTS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10Parts, details or accessories
    • A61G5/14Standing-up or sitting-down aids
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT OR ACCOMODATION FOR PATIENTS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10Parts, details or accessories
    • A61G5/1054Large wheels, e.g. higher than the seat portion
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61GTRANSPORT OR ACCOMODATION FOR PATIENTS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10Parts, details or accessories
    • A61G5/12Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/128Rests specially adapted therefor, e.g. for the head or the feet for feet
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S180/00Motor vehicles
    • Y10S180/907Motorized wheelchairs
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S297/00Chairs and seats
    • Y10S297/10Occupant-arising assist

Abstract

A wheel chair with a lifting device characterised in that the seat and the foot rest are separately mounted at the upper ends of two adjustable quadrilateral assemblies (23, 42) extending upwards from the frame and having a common movable portion (26), and in that the up-down control system (50) includes a drive unit arranged between the frame and one of the movable members of one of the quadrilateral assemblies for controlling the movement of said quadrilateral assemblies between a stable collapsed position and a stable deployed position. The device is useful in stand-up wheelchairs.

Description

DEVICE-LIFT FOR WHEELCHAIR verticalis creator AND WHEELCHAIR USING SAME TECHNICAL FIELD

The present invention relates wheelchairs used by handicapped and disabled and aims indifferently folding wheelchairs or not.

It is indisputable that wheelchairs have brought a possibility of mobility for handicapped and disabled. These wheelchairs have, however, several drawbacks relating to the fact that users can occupy only a sitting position, also generally maintained for relatively long periods. In an attempt to remedy the drawbacks to taking this one opportunity to use, various proposals have been made for such chairs are made standing frames, allowing to keep the user in a substantially upright position.

PRIOR ART

In general, the proposals made involving an articulated structure comprising a back, seat and footrest. Such a structure is generally mounted articulated with the seat on a front horizontal axis and perpendicular to the vertical plane of symmetry of the chassis. Motor means is interposed between the chassis and the structure to enable the raising or lowering of the latter and able to occupy a folded position said seat and a said unfolded position verticalized. The motor means may be either manually operated, electrical or otherwise.

To illustrate this prior art, it is possible to cite, among others, the French patent 69-35042, German patent application 26 25 045 or French patent 82-11713.

These different proposals certainly meet the objective of verticalization referred and, in this sense, brought a wellness indisputable users. Structural proposals that have been made by the prior art are generally based on the articulation of the articulated structure in a horizontal frontal axis and perpendicular to the vertical plane of symmetry of the chassis and bearing on the latter. Such an organization has the effect, in the function of verticalization, transfer the articulated structure and the user verticalized towards the front part of the chair with a consequent increase of the load on the front wheels and reducing that of the rear wheels.

Such a consequence introduces a factor of instability, since the support polygon is not loaded so as also distributed. That is why, as a rule, additional support points are provided to stabilize the chair in the state of verticalization of the articulated structure. Such additional support points are frequently, if not always, consist of rollers, skates, crutches or by the beads which are provided building in the extension of the footrest, so as to bear on the ground in the verticalized state of the articulated structure.

If such a proposal in the general sense, lets give a stability and security factor for some users, however, it poses an insurmountable problem when it is appropriate to consider the will to make wheelchairs, mobile, even in the verticalized state of the articulated structure. Such a trend corresponds to the desire of users to be able to recover from such a means, a way of life and perfectly understandable autonomy.

To reconcile such a wish with the current art seems incompatible with the search for stability and, where necessary, good maneuverability. To try to remedy this dual requirement of different construction proposals were made by the prior art. It has been proposed, for example as illustrated by US Patent 3,907,051, to place the drive means in a post box, so as to ballast the wheelchair to lower the center of gravity and balance the frontal overload settled in the standing position.

Such a proposal should certainly provide answers to some problems of stability and security, but does not appear workable in all configurations and with all the energy that could be implemented to ensure the engine of the wheelchair.

Furthermore, such a proposal seems hardly compatible with the desire to have a wheelchair that is still pliable to allow its easy transportation, particularly in a motor vehicle.

The prior art knows a different proposal by WO 82-01314 advocating to get on the wheelchair frame a hinged structure, when switching to standing position, has a retro relative movement has the effect of placing all of the structure and of the user substantially in alignment with the vertical axis passing through the center of the supporting polygon that constitutes or that defines the frame.

In this way, the overall load is distributed verticalized compared to the support polygon and gives the latter some stability for considering the engine and moving the wheelchair, even in this state of verticalization.

However, the examination of the proposal shows that the technology proposed by WO 82-01314, is relatively complicated and uses a high number of points of articulation between the different elements of the articulated structure and many connections rods linking the frame structure.

These numerous hinge connections weaken the construction, all weigh down and require constant maintenance to avoid that any local malfunctioning does not result in a defective folding or unfolding, may lead to accidents.

Moreover, a large part of these joints are placed in front of the wheelchair and in particular in a front region to the seat with the effect of impeding access to the latter for a disabled or invalid.

Moreover, the fact to automatically cause the reverse movement of the articulated structure involves moving in the same direction the footrest, a front position corresponding to a sitting state to a retracted position corresponding to a state verticalized.

This displacement in the anteroposterior direction over the two movements involves leaving intact the sufficient passage template for the footrest and poses a hardly soluble adaptation problem on the chassis front wheels, swivel and directional, generally more smaller in diameter than the supporting rear wheels, as is most frequently adopted for wheelchairs.

Subjection this complicates the manufacture of the chair, as well as the realization of the latter in a particular transverse size template, consistent with the different applications, such as household use, for which a passage between the legs of jambs in standard doors must be made possible.

The number of joints and the number of connecting rods also have the effect of substantially add to the equipped chair that becomes less manipulable, while demanding from the user a greater physical exertion when moving the chair n is not derived from or assisted by an onboard motor.

The present invention seeks to remedy the above drawbacks by providing new means of connection between an articulated structure and a stand-up wheelchair chassis, such means, while allowing vertical integration, allowing otherwise lead, automatically and simultaneously to verticalization phase, a reverse movement of the articulated structure to center the load verticalized relative to the support polygon and thus confer the chair placed in such a state of use stability and safety allowing mobility and ability to manual movement or motorized, without any risk to the subject verticalized.

Another object of the invention is to propose ways to support and articulation that are simple, reliable, lightweight and inexpensive, so as to make possible an adaptation in the best conditions, without significantly burdening the chair and make possible, if necessary, an adaptation on folding chairs. PRESENTATION OF THE INVENTION

To achieve the above objectives, the lift-device for wheel chair is characterized in that - the seat and the footrest are independent of one another and are mounted on the upper ends of two deformable quadrilaterals , s rising from the chassis and having a common movable part, the elevation-lowering control means comprise a drive member interposed between the frame and one of the movable members of one of the quadrilaterals, and suitable for controlling the displacement said quadrilaterals between a collapsed stable state corresponding to a so-called seat position of the structure and a stable unfolded state corresponding to a so-called verticalization position of the structure in which the mass represented by the latter is substantially centered relative to the support polygon. The invention also relates to a stand-up wheelchair including a hinged structure connected to the frame by the above means.

Various other characteristics appear from the description given below with reference to the accompanying drawings which, as non-limiting examples, embodiments of the object of the invention.

BRIEF DESCRIPTION OF DRAWINGS

Figure 1 is a schematic side elevation of a chair according to the invention.

Figure 2 is a front view taken along the line II-II of Figure 1. Figures 3 and 4 are views similar to Figure 1 showing the chair in two characteristic positions. Figure 5 is a front view similar to Figure 2 but illustrating an alternative embodiment. BEST WAY TO REALIZE THE INVENTION

Figures 1 and 2 schematically show a wheelchair 1 comprising a frame 2 constituted by a lower frame 3, for example formed by longitudinal members 4 interconnected by cross members 5 and 6. It goes without saying that this embodiment is given by way of example and schematically, for the sole purpose of alleviating the representation while allowing the understanding of the purpose of the invention. Thus, the frame 2 is provided so as usually known, wheels 7 generally carriers, and main drive and steering wheels 8, steerable by means of pivots 9. The wheels 8 are usually, but not necessarily, placed at the front of the chassis 2, while the carrier wheels 7 hold the rear portion. The wheels 7 and 8 define, with the points of contact with the ground S, a supporting polygon or lift the center of which passes a vertical axis x-x '. The wheels 7 are mounted on the chassis 2 by means of bearings 10 and may be advantageously associated with drive motors organs reversible rotation 11, such as one or electric motors may be powered on from an onboard source 12 arranged on a console 13 placed between uprights 14.

The chassis 2 supports, in a conventional manner, an articulated structure comprising a seat 20, a backrest 21 and a footrest 22. In known manner, the articulated structure is organized to be able to occupy a stable state, folded, corresponding to a said sitting position, as shown in Figure 1 and stable condition, unfolded, corresponding to a standing position, as illustrated by Figure 4. in these two positions and by means known to the art and not shown , the articulated structure is adapted to support a disabled or invalid in a sitting position and a standing position, respectively.

According to the invention, the articulated structure is organized so that the seat 20 is supported by the frame 2 via a hinge means 23 in form of a deformable quadrilateral, such means for example being organized in two side assemblies 24. Each assembly comprises a rear part or articulated link 25 and a hinged front or link 26 which are respectively mounted by pins 27 and 28 of the rear pillars 14 and on the longitudinal members 4. the upper ends of the articulated parts or links 25 or 26 are the seat 20 by means of hinge pins 29 and 30 which are placed respectively substantially at the middle portion of the underside of the seat 20 and the front portion thereof. In the folded state, the portion 25 extends from the posts 14 towards the front, in a substantially horizontal direction, while the hinged front portion 26 extends forwards but according to a rising inclination from the frame 2.

The backrest 21 is mounted according to the invention, by a hinge pin 31 on the rear portion of the seat 20 and is connected thereto by a hinge means 32 in form of a deformable quadrilateral. The means 32 comprises a mobile part which is common to the deformable quadrilateral 23.

The means 32 is for example formed by an extension 21a extending downward from the folder 21 and on which is articulated, by a shaft 33, a movable portion 34, such as one or two connecting rods connected by a pin 35 to 25 or rear portions 23 constituting the deformable quadrilateral.

The movable portion 34 may also be organized into two lateral assemblies in the same manner as the assemblies 24.

The footrest 22 is preferably formed by two legs 40 each provided at the base of a sole 41. The two legs 40 are independent and free articulation with the seat 20 and are carried by the chassis 2 by via a hinge means 42, of the deformable quadrilateral type, preferably, also organized as other quadrilaterals in the form of two side assemblies. Each side assembly comprises a front part 43 hinged by a pin 44 on the chassis 2 and with the corresponding leg by a hinge pin 45. Each upper side assembly also involves for constituting the deformable quadrilateral, a common element with the quadrilateral 23 deformable, such a common element being constituted by the front portion 26 which is located, in such a case, located after the front part 42. to perform this function, the front part 26 is provided, below its point of joint 30 with the seat 20, an extension 46 on which is mounted the leg 40 via a pivot pin 47.

The anterior portion 43 of each deformable quadrilateral 42 extends forward at an upward inclination between the frame 2 and the jamb 40.

As is apparent from Figure 1, the deformable quadrilateral system 23 is defined by the pivot points 27, 28, 29 and 30. The hinge deformable quadrilateral system 32 is defined by the hinge points 29, 31, 33 and 35.

The basic quadrilateral articulation deformable system 42 is defined by the pivot points 28, 44, 45 and 47.

According to the invention, it is intended to provide the step-up device described above of a drive member 50 for passing the articulated structure of the position according to Figure 1 to the position according to Figure 4 and vice versa. Such a drive member 50 may be constituted by a manually operated mechanism or, preferably, by an energy transformer, the electric jack type, capable of being supplied from the source 12, in particular by means of a manipulator 51 accessible, for example on one of the armrests 52 are detachable or adjustable, fitted to the backrest 21 or the seat 20. the engine body 50 is interposed between the frame 2 and one of the mobile elements of a deformable quadrilaterals and, preferably, one 23 adapted to the seat 20. in a suitable example illustrated by Figure 1, the motor 50 member consists of an electrical actuator whose base is adapted to the frame 2 and whose rod is, for example, articulated by a pin 53 on a cross-linking portions 25 of the two lateral assemblies 24.

In the case of adaptation of a drive member 50 for manual operation, it may be provided to associate the elastic joints, such as gas struts, to relieve the load, in particular during the unfolding of the articulated structure for pass from the state according to Figure 1 in the state according to Figure 4 verticalized.

Although it is not shown, the frame 2 can be arranged to display one or more stops 60 for reserving a support structure in the articulated position or in the folded state, cooperating e.g. directly or indirectly with the seat 20 and / or a suitable deformable quadrilaterals. In the state according to Figure 1, the articulated structure is in the folded position in a position such that the seat 20 is substantially horizontal and that the footrest 22 is disposed immediately before the front part of the chassis and the plane transverse pivots of articulation of eight steerable wheels.

When it is desired to order the state change of the articulated structure to move it in a state of raising, the motor 50 is controlled member, for example to ensure its extension stroke, so that it tends to raise the articulated elements 25 constituting the deformable quadrilateral own 23 to the seat 20. the linkage members 25 are thus constrained to rotate in the direction of the arrow fj (fig.3) on the axes 27 and displaces the axis 29 in a circular path T having its center at the axis 29 and to radius the length of the elements 25.

The displacement of the axis 29 results in the same direction the seat 20, the hinge pin 30 is moved in a circular path T 2 having its center at the axis 28 and to radius the length of the front portion 26. the constructive characteristics of the deformable quadrilateral 23 are the curves T, and T 2 intersect at a point O 'as shown in Figure 3, so that the seat is moved rearwardly simultaneously subjected to a relative pivoting in the direction of the arrow f 2 *

Simultaneously, the pivoting of the seat 20 causes the upward displacement of the axis 31 which present the file 21 to a movement relative to the seat, although remaining by itself in substantially the same inclination. Such a feature is provided by the deformable quadrilateral structure 32.

The displacement according to the curve T 2 of the point 30 causes the displacement according to the curve T 3 the pivot point 47 of the deformable quadrilateral 42, this trajectory T 3 having its center at the pivot point 28 and to the radius of rod 26 between this point and the axis 47. through the legs 40, the articulation points 45 are moved in a circular path T 4, having its center at the axis 44 and radius the length of the previous elements 42.

This characteristic that in the intermediate phase and concomitantly the displacement in the direction of arrow f 2 of the seat 20, the footrest 22 is raised and moved backward, as shown in Figure 3. The extent of elevation is provided by the constructive characteristics of the deformable quadrilateral 42 in such a manner that when the flanges 41 suφlombent horizontal casing pivoting of the front wheels 8 with their initial inclination, they are located at a height from the ground greater than S in diameter of the latter. In this way, the retro movement of the footrest 22 can be carried out freely regardless of the orientation of front steering wheels 8.

The characteristics of the deformable quadrilaterals are selected by design such that, after the displacement of the operating member 50 on its active stroke, the seat 20 and backrest 21 are substantially placed in alignment according to a low inclination, while the footrests feet 22 is by retro-displacement included within the support polygon defined by the wheels 7 and 8. in this state said standing frame, as is apparent from Figure 4, it appears that the hinged structure is distributed as a whole either side of the vertical axis xx ', so that the load or mass it represents only and that which constitutes the subject are verticalized perpendicularly to said vertical axis xx' and substantially the center of the support polygon to give the chair brought in such a configuration, a steady state allowing a displacement through the wheels.

The constructive characteristic of the means of supporting and articulating based on three deformable quadrilaterals has the characteristic of causing relative movement of the backrest, of the seat and the footrest, as trajectories Tj, T 2, T 3 and T 4 which are directed towards the back of the chair and thus generate a reverse movement of the articulated structure to bring the latter from the sitting position to a prior tendency to standing position substantially centered on the axis x-x '.

Furthermore, as can be seen by comparison of Figures 1, 3 and 4, the means according to the invention allow to significantly reduce the congestion in the anterior-posterior plane of the chair in standing position and to impart a compactness in this state encouraging developments.

An inverse operation to that just described is established when the member 50 is controlled to bring the articulated structure of the verticalized position to the seated position shown in Figure 1.

5 shows an alternative embodiment wherein the deformable quadrilaterals are organized either in lateral assemblies such as 24, but in a columnar being grouped on either side of the antero-posterior plane of vertical symmetry P-P .

INDUSTRIAL APPLICATION

The invention finds a particularly advantageous application in the industrial standers chairs which, in addition, offer a possibility of bending in a vertical plane of symmetry, longitudinal, so as to reduce congestion in the transport phases, including automobile.

The invention is not limited to the examples described and shown since various modifications can be made without departing from its scope.

Claims

1 - Device-lift truck for raising wheel chair of the type comprising a frame (2) provided with wheels (7, 8) defining a support polygon and supporting a hinged structure comprising a seat (20), a footrest (22 ) and a backrest (21), the apparatus comprising means for supporting and hinging the structure on the chassis and means for controlling elevation-lowering said structure relative to the frame, characterized in that - the seat and the footrest are independent of one another and are mounted on the upper ends of two deformable quadrilaterals (23, 42) rising from the chassis and having a common mobile part (26),
- means (50) in elevation-lowering control comprises a drive member interposed between the frame and one of the movable members of one of the quadrilaterals, and suitable for controlling the movement of said quadrilaterals between a collapsed stable state corresponding to a position said base structure and a stable unfolded state corresponding to a so-called verticalization position of the structure in which the mass represented by the latter is substantially centered relative to the support polygon.
2 - Device-lift according to claim 1, characterized in that the structure comprises a footrest (22), a seat (20) and a backrest (21) hinged at its base on the rear part of the seat and linked by a deformable quadrilateral (32) to that of the seat with which it has a common mobile part (25).
3 - Device-lift according to claim 1 or 2, characterized in that the hinged structure is mounted on the chassis by deformable quadrilaterals which are organized into two side assemblies (24).
4 - Device-lift according to claim 1 or 2, characterized in that the hinged structure is mounted on the chassis by deformable quadrilaterals which are organized as a column. 5 - Device-lift according to one of claims 1 to 4, characterized in that the structure comprises a seat (20) which is articulated by its anterior part and substantially by its central part on the upper ends of the movable parts (25 , 26) constituting the quadrilaterals and respectively called front and rear and connected to the lower part (3) and the rear part (14) of the frame.
6 - Device-lift according to one of claims 1 to 5, characterized in that the structure comprises a footrest (22) which is articulated by its front part and on its rear part, respectively, the upper end a previous mobile part (43) constituting the deformable quadrilateral (42) itself articulated on the lower part of the frame and the movable part said front (26) of the deformable quadrilateral (23) adapted to the seat.
7 - Device-lift according to one of claims 1 to 6, characterized in that the drive member (50) is constituted by an energy transformer inteφosé between the frame (2) and the quadrilateral (23) suitable for the 'seated. 8 - Device-lift according to one of claims 1 to 6, characterized in that the drive member (50) comprises a manually operable means associated with at least one resilient compensator.
9 - up wheelchair including a hinged structure connected to the frame by a lifting-device according to one of claims 1 to 8.
EP19950913214 1994-03-18 1995-03-17 Lifting device for a stand-up wheelchair and wheelchair using same Expired - Lifetime EP0699067B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR9403439 1994-03-18
FR9403439A FR2717377B1 (en) 1994-03-18 1994-03-18 Device-lift truck for up wheelchair and wheelchair in application.
PCT/FR1995/000330 WO1995025497A1 (en) 1994-03-18 1995-03-17 Lifting device for a stand-up wheelchair and wheelchair using same

Publications (2)

Publication Number Publication Date
EP0699067A1 true true EP0699067A1 (en) 1996-03-06
EP0699067B1 EP0699067B1 (en) 1998-09-16

Family

ID=9461366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950913214 Expired - Lifetime EP0699067B1 (en) 1994-03-18 1995-03-17 Lifting device for a stand-up wheelchair and wheelchair using same

Country Status (6)

Country Link
US (1) US5772226A (en)
EP (1) EP0699067B1 (en)
CA (1) CA2163254A1 (en)
DE (2) DE69504790T2 (en)
FR (1) FR2717377B1 (en)
WO (1) WO1995025497A1 (en)

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Also Published As

Publication number Publication date Type
EP0699067B1 (en) 1998-09-16 grant
FR2717377A1 (en) 1995-09-22 application
CA2163254A1 (en) 1995-09-28 application
DE69504790T2 (en) 1999-03-18 grant
US5772226A (en) 1998-06-30 grant
DE69504790D1 (en) 1998-10-22 grant
WO1995025497A1 (en) 1995-09-28 application
FR2717377B1 (en) 1996-06-21 grant

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