EP0600978A1 - Fauteuil roulant - Google Patents

Fauteuil roulant

Info

Publication number
EP0600978A1
EP0600978A1 EP92917727A EP92917727A EP0600978A1 EP 0600978 A1 EP0600978 A1 EP 0600978A1 EP 92917727 A EP92917727 A EP 92917727A EP 92917727 A EP92917727 A EP 92917727A EP 0600978 A1 EP0600978 A1 EP 0600978A1
Authority
EP
European Patent Office
Prior art keywords
wheel
wheels
wheel chair
chassis
ground
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.)
Withdrawn
Application number
EP92917727A
Other languages
German (de)
English (en)
Inventor
Jan Ekman
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.)
VITACTIV AB
Original Assignee
VITACTIV AB
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
Application filed by VITACTIV AB filed Critical VITACTIV AB
Publication of EP0600978A1 publication Critical patent/EP0600978A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1054—Large wheels, e.g. higher than the seat portion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1083—Quickly-removable wheels

Definitions

  • the present invention is related to a wheel chair according to the precharacterizing part of the enclosed claim l.
  • the convertibility of such wheel chairs involves the notion that the chair in the first operational state, in which it rests on the ground solely by means of the small front and rear wheels, should be displaced forwardly by a person sitting therein obtaining contact with the ground by means of his feet and pushing the chair forwardly, or rearwardly if desired.
  • the second operational state in which the wheel chair rests on the ground by means of, on one hand, either the small front or rear wheels and, on the other hand, the big wheels, the chair is suited for propulsion by the person sitting therein causing the big wheels to rotate with his hands, either by gripping the wheels directly or rims connected thereto.
  • the two operational states are, accordingly, suitable for such persons bound to wheel chairs, who have considerable strength in their legs and arms respectively.
  • one and the same chair may, at different times, be used by persons having different physiological abilities, but it is also possible that one and the same person may want to change between the two ways of displacing the wheel chair.
  • a wheel chair which has the big wheels removably arranged at its chassis, the conversion from the first to the second operational state occurring by manual lifting of the wheel chair resting on the small front and rear wheels so that it still rests on the rotatable front wheels during application of the big wheels to the chassis, whereafter the rear small wheels hang in the air, since the big wheels extend further downwardly relative to the chassis than the small rear wheels.
  • the conversion from the second to the first operational state occurs in a reverse manner.
  • a wheel chair of the kind mentioned by way of introduction is previously known by GB 2 113 160.
  • the small rear wheels are vertically movable so that they, by pressing these small wheels downwardly, can be caused to take over the support function from the big wheels.
  • the problem with the wheel chair rolling away on conversion occurs also here and it is necessary to lift the rear end of the wheel chair to press down the small wheels below the big ones. It would appear to be practically impossible to obtain conversion with a person sitting in a chair, at least conversion from the second to the first operational state.
  • the US patent 4 457528 describes a wheel chair, the big wheels of which are removable from the chassis in order to make the wheel chair rest only on the small wheels thereafter.
  • the same problems that have been mentioned above in connection with the second US patent arise on conversion.
  • a few wheel chairs of a related kind may be mentioned:
  • the US patent 3 216 738 describes a wheel chair comprising a wheel chair unit having big and small wheels and a frame supporting the wheels. This unit may be removed from the wheel chair so that the wheel chair is transformed into a chair instead. Thus, there exists no real first operational state, but instead the wheel chair then operates as an ordinary chair. The exchange between the two states occurs in a position, in which the wheel chair is not held steadily in place, since it rests on its wheels, and the conversion is entirely impossible to execute for a person sitting in the wheel chair.
  • German patent DE 32 30 179 describes a wheel chair which does not have the possibility to exchange operational state but which comprises a lifting device for lifting the wheel chair in its entirety between different levels to overcome level differences. With the exception that some of the wheels in certain situations is brought out of contact with the ground, this wheel chair has nothing in common with the wheel chairs according to the nature defined by way of introduction.
  • the object of the present invention is to provide a wheel chair according to the precharacterizing part of the enclosed claim O 93/02648 4
  • the lifting device By providing, in accordance with the invention, a lifting device and by means of the operational state converting posi ⁇ tion achieved thereby, it becomes, accordingly, possible to change between the two operational states in a very simple manner. Since the lifting device is adapted to counteract relative movement between the wheel chair and the ground and the wheel chair, with exception of the lifting device in the converting position, rests on the ground only by means of the small front and/or rear wheels while lifting at least one of them and at least one of the big wheels out of contact with the ground, the wheel chair stays safely in place during execution of the manipulations which are necessary for conversion. Furthermore, it becomes entirely possible, by designing the lifting device in an appropriate manner, to carry out conver ⁇ sion also with a person sitting in the wheel chair.
  • the chassis of the wheel chair comprises attachments for releasable rotatable reception of the big wheels and the big wheels are adapted to be moved to and removed from the attachments, and, accordingly, the wheel chair in the elevated operational state converting position for conversion to the second and first respectively operational state.
  • wheels may be attached or removed in a simple manner after readily having obtained the operational state conversion position by operating the lifting device since the big wheels hang above the ground and thereafter the lifting device may be operated to lower the wheel chair until the big wheels and the other small wheels respectively get in contact with the ground.
  • said attach ⁇ ments and big wheels comprise co-operating members enabling quick-locking of the wheels to the attachments so that attach ⁇ ing and removing of these wheels may occur with some minor rapid manipulations.
  • Fig 1 is a diagrammatical perspective view obliquely from behind of a wheel chair according to a preferred embodiment of the invention
  • Fig 2 is a side view of the wheel chair according to Fig 1 in a second operational state
  • Fig 3 is a side view of the wheel chair according to Fig 1 in a first operational state
  • Fig 4 is a side view illustrating the wheel chair according to Fig 1 in an operational state converting position
  • Fig 5 is a partially cut view through the hub of a big wheel of a wheel chair according to Fig 1 and a part of an attachment therefor;
  • Fig 6 is a view corresponding to Fig 5 and illustrating a position in which the wheel axle of the big wheel may be removed from the attachment.
  • a wheel chair 1 is diagrammatically illustrated in Fig 1, said wheel chair comprising a chair 3 supported by a chassis or frame 2 and adapted to receive a person using the wheel chair sitting therein, and wheels for supporting the wheel chair on the ground in the form of two small front wheels 4, two small rear wheels 5 and two big wheels 6.
  • These wheels are adapted rota- table about substantially horizontal axes, the front and rear small wheels also being held by holders 7, which are rotatably arranged at the chassis 2 about substantially vertical axes. This means that the small wheels may be adjusted into different directions relative to the chassis and the rest of the wheel chair in order to enable steering of the wheel chair.
  • the wheel chair is illustrated in a second operational state in Fig 3, in which it is without the removed big wheels 6 and rests on the ground 9 by means of the front and rear small wheels 4 and 5 respectively.
  • Fig 3 In this state it is intended that the chair should be displaced by a person sitting therein moving his feet in contact with the ground and pushing himself forwardly by means of leg power.
  • leg power It is also conceivable that one desires to be relieved of the big wheels since they could be hindering and/or the wheel chair becomes more easy to steer on small areas, such as in a flat.
  • the big wheels 6 are removably rotatably arranged at the chassis 2 so that they can be at ⁇ tached to or removed therefrom for changing the wheel chair between the two operational states illustrated in Figs 2 and 3.
  • This arrangement of the big wheels at the chassis will be explained later with reference to, in particular. Figs 5 and 6.
  • a lifting device 10 is arranged at the chassis 2 of the wheel chair and adapted to act between the chassis 2 and the ground 9 to elevate the chassis parts adjacent to the lifting device relative to the ground.
  • the lifting device consists in the embodiment illustrated of a cylinder 11 recei ⁇ ving a rigid rod 12 having a lower foot 13, said rod being displaceable in the cylinder and acting as a distance element.
  • the lifting device is connected to a power source not illus ⁇ trated, such as for example a source for supplying hydraulic or pneumatic power or electric energy for, as an example, screwing the rod 12 out of and into the cylinder 11.
  • the lifting device is operable, preferably by the person sitting in the chair, by means of an operating member not illustrated.
  • a lifting assembly formed by said cylinder 11 and rod 12 has been shown at one side of the wheel chair it is intended that a similar assembly should be provided at the opposite side of the wheel chair.
  • the lifting device could comprise only a single such assembly arranged under the middle of the wheel chair on the cross beam 15, which is included in the chassis 2 and connects the two longitudinal beams 14 thereof. This lifting assembly would then be capable of lifting, simultaneously, the rear small wheels and the big wheels on both sides of the wheel chair.
  • the lifting device When the operational state of the wheel chair is to be changed from the position according to Figs 2 or 3, the lifting device is operated so that the rod 12 is displaced downwardly into contact with the ground 9 and thereafter the extreme end 13 of the rod is displaced further vertically away from the chassis while lifting the same relative to the ground.
  • the lifting device may then be arranged to displace the distance element rod 12, in relation to the position achieved on ground contact by means of the foot 13 in the condition according to Fig 2, further about 15 mm vertically relative to the cylinder 11 so that a big wheel 6 attached to the chassis clearly gets out of contact with the ground or, in the operational state according to Fig 3, such a big wheel may be attached to the wheel chair while being free from the ground.
  • the big wheels may, accordingly, be attached to or removed from the wheel chair whereas the wheel chair is held in a stable position due to the friction of the foot 13 against the ground without having to lift or roll over the wheel chair manually in order to be able to take care of wheel exchange.
  • the rear small wheels 5 simultaneously act as a protection against rearward tipping.
  • An attachment 16 is secured to the chassis for each of the big wheels 6.
  • the attachment 16 is adapted to releasably and rotatably receive the big wheels by presenting a through passage 17, which is provided by a sleeve 19, which is inserted into a hole 18 of the attachment 16 and provided with an external thread, said sleeve being retained to the attachment 16 by means of nuts 20 engaging with the sleeve and located on either sides of the attachment.
  • the extreme end of the wheel axle 21 of the big wheel is introdu ⁇ ible into the passage 17.
  • the hub 23 of the wheel is, furthermore, in a conventional manner rotatable about the wheel axle 21 by means of bearings 22.
  • a rubber ring 24 is provided about the wheel axle and adapted to abut against a shoulder 25 formed between the part of the wheel axle introduced into the sleeve 19 and the rest of the wheel axle, said rest having a larger diameter than said end.
  • the end of the sleeve 19 pointing opposite to the direc ⁇ tion of introduction of the wheel axle is pointed to obtain some axial resiliency of the wheel axle in the sleeve.
  • the wheel axle 21 is hollow and comprises a passage 27 recei ⁇ ving a substantially cylindrical core part 26.
  • the passage 27 comprises a step 28 with a diameter increase in the end oppo ⁇ site to the end adapted for introduction into the sleeve 19.
  • the extreme end of the core part which is remote from the sleeve 19 presents a diameter increase 29, which begins from a second step 30, a compression spring 30 being adapted to act between said second step 30 and the step 28, said compression spring being wound about the core part 26.
  • the compression spring 31 tends to press the core part 29 out of the wheel axle in the direction of the arrow A. This, however, is counteracted by two balls 32, which are adapted to abut against 93/02648 10
  • the wheel axle 21 comprises, in the area of the balls 32, recesses, out of which the balls 32 are adapted to protrude in the position according to Fig 5.
  • the spring 31 strives to press out the core part 26 out of the wheel axle, whereby the balls 32 are pressed against and get fastened to the periphery of the sleeve 19 and in this way retains the wheel axle and the wheel to the attachment 16.
  • the wheel may rapidly be removed from the attachment 16 by manually pressing the end of the core part 26 into the wheel axle in the direction of the axle B while storing poten ⁇ tial energy in the compression spring 31, whereby the balls 32 will be able to move along the circumferential surfaces 33 of the core part in a converging direction and, accordingly, inwardly in the recesses of the wheel axle, so that thereafter the wheel axle may be retracted from the sleeve 19 with main ⁇ tained compression of the spring 31.
  • the big wheels so that they remain on the wheel chair also in the first opera ⁇ tional state either by making the rear small wheels movable downwardly against the ground or the big wheels elevatable relative to the chassis when the position according to Fig 4 has been achieved.
  • the lifting device could be located at another place on the chassis than the one illustrated on the drawings and it could also be designed in an arbitrary manner as long as it fulfils the function aimed at.
  • the lifting device could comprise a pivot arm pivotably connected to the chassis and being actuatable by means of line control device so as to be brought to pivot relative to the chassis and enter into contact with the ground and lift the chassis relative thereto with its free end.
  • the two attachments for the big wheels could be connected to each other by means of a cross bar so that they, together with this cross bar, form a U-shaped configuration.
  • the wheels could be more in number than illustrated in the Figures but the front or rear small wheels could also occur in the singular.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Handcart (AREA)

Abstract

Un fauteuil roulant comprend un châssis (2) sur lequel sont agencées des petites roues avant et arrière (4 et 5 respectivement) ainsi que des grandes roues (6) permettant à la personne assise dans ledit fauteuil de le déplacer manuellement. Ledit fauteuil roulant peut passer d'un premier état opérationel, dans lequel il repose sur le sol uniquement au moyen des petites roues avant et arrière (4 et 5 respectivement), à un second état opérationel, dans lequel il repose sur le sol au moyen, d'une part, des petites roues avant et arrière, et d'autre part, des grandes roues (6), et inversement. De plus, ledit fauteuil roulant (1) comprend un dispositif (10) pouvant être commander pour fonctionner entre le châssis (2) et le sol (9) afin de soulever le châssis pour obtenir une position de conversion d'état opérationnel, dans laquelle le fauteuil roulant (1) repose sur le sol au moyen du dispositif de levage, lequel est adapté, dans cette position, pour s'opposer au mouvement relatif entre le fauteuil roulant et le sol, ainsi que les petites roues avant et/ou arrière tout en levant au moins une de celle-ci ainsi qu'au moins une des grandes roues, lesquelles, alors, ne sont plus au contact du sol.
EP92917727A 1991-08-09 1992-08-05 Fauteuil roulant Withdrawn EP0600978A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9102322A SE467950B (sv) 1991-08-09 1991-08-09 Rullstol vilken aer konverterbar mellan olika hjulpar
SE9102322 1991-08-09
PCT/SE1992/000539 WO1993002648A1 (fr) 1991-08-09 1992-08-05 Fauteuil roulant

Publications (1)

Publication Number Publication Date
EP0600978A1 true EP0600978A1 (fr) 1994-06-15

Family

ID=20383438

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92917727A Withdrawn EP0600978A1 (fr) 1991-08-09 1992-08-05 Fauteuil roulant

Country Status (3)

Country Link
EP (1) EP0600978A1 (fr)
SE (1) SE467950B (fr)
WO (1) WO1993002648A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0943463A1 (fr) * 1998-03-19 1999-09-22 Edco Engineering S.A. Dispositif de fixation d'un moyeu de roue sur un châssis à l'aide d'un axe amovible, en particulier sur une chaise roulante
DK200300469A (da) * 2003-03-27 2004-09-28 Rolko Scandinavia Aps Hjulkobling
US7222868B2 (en) * 2005-06-01 2007-05-29 Steelcase Development Corporation Seating unit with wheelchair base

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2113160B (en) * 1981-10-27 1984-10-03 Spastics Soc Improvements in foldable wheelchairs
SE458502B (sv) * 1984-04-19 1989-04-10 Torgny Jan Ab Jatab Saett och rullstol foer att hantera en person med begraensad roerelsefoermaaga

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9302648A1 *

Also Published As

Publication number Publication date
SE9102322D0 (sv) 1991-08-09
SE467950B (sv) 1992-10-12
WO1993002648A1 (fr) 1993-02-18

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