EP0945114A1 - Kippbarer Rollstuhl mit Tragfederelement - Google Patents

Kippbarer Rollstuhl mit Tragfederelement Download PDF

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Publication number
EP0945114A1
EP0945114A1 EP99200503A EP99200503A EP0945114A1 EP 0945114 A1 EP0945114 A1 EP 0945114A1 EP 99200503 A EP99200503 A EP 99200503A EP 99200503 A EP99200503 A EP 99200503A EP 0945114 A1 EP0945114 A1 EP 0945114A1
Authority
EP
European Patent Office
Prior art keywords
spring
wheelchair
wheelchair according
spring element
frame
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Withdrawn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
EP99200503A
Other languages
English (en)
French (fr)
Inventor
Eduard Laurens Van Reenen
Gijsbert Legemaat
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.)
GEA Food Solutions Weert BV
Original Assignee
Aquarius BV
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 Aquarius BV filed Critical Aquarius BV
Priority to DE29909229U priority Critical patent/DE29909229U1/de
Publication of EP0945114A1 publication Critical patent/EP0945114A1/de
Withdrawn legal-status Critical Current

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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
    • A61G5/14—Standing-up or sitting-down aids
    • 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
    • A61G5/1078—Parts, details or accessories with shock absorbers or other suspension arrangements between wheels and frame
    • 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
    • A61G5/1056—Arrangements for adjusting the seat
    • A61G5/1075—Arrangements for adjusting the seat tilting the whole seat backwards

Definitions

  • the invention relates to a wheelchair, comprising a bottom frame provided with wheels and a top frame for mounting a seat thereon, the bottom and top frames being connected to one another tiltably, in such a manner that the top frame is able to adopt at least a front and a rear position, and at least one spring element being arranged between the bottom and top frames in such a manner that the spring element assists with the movement from the rear position to the front position, which spring element comprises a first spring.
  • a wheelchair of this nature is known from United States Patent US 4,519,649.
  • the top frame is arranged tiltably, in such a manner that a user is pushed upwards and forwards when moving towards the front position. This makes it considerably easier for the user to get out of the wheelchair. On the other hand, it is also easier for a user to get into the wheelchair if the top frame firstly assumes the front position and, partly under the influence of the weight of the user, is moved into the rear position, which is the normal position of use. When the top frame is moved into the rear position, the spring element, a gas spring, is compressed.
  • United States Patent US 5,513,867 discloses a wheelchair having a mechanism to assist the user when getting up.
  • This known mechanism comprises a combination of a hydraulic cylinder, coil springs and cables connected to the coil springs and running over cams.
  • This mechanism is relatively complicated and involves risks.
  • the cables must carefully be maintained under tension to prevent them from being pushed from the cams.
  • the fingers of the user are trapped between the cables and the cams, thus endangering the safety of the user.
  • a wheelchair of the type mentioned in the preamble is designed in such a manner that the spring element additionally comprises a second spring which has a free travel which is such that the second spring assists the action of the first spring over part of the spring path of the latter.
  • the spring element comprises a second spring which is active over only a limited path it is achieved that the forward movement of the top frame is assisted, at least initially, by two springs, while when moving the top frame towards the rear position initially the resistance of only one spring has to be overcome.
  • the wheelchair according to the invention is designed in such a manner that the spring element comprises an adjustment element for adjusting the free travel of the second spring.
  • the spring element comprises an adjustment element for adjusting the free travel of the second spring.
  • the first spring is formed by a gas spring and the second spring is formed by a coil spring.
  • a gas spring is suitable for assisting the relatively long total spring path, while a coil spring is suitable for assisting the relatively short additional spring path.
  • the combination of a gas spring and a coil spring ensures that at least some spring action is always maintained even if the gas spring were to become defective, for example as a result of damage, and lose its spring action.
  • a wheelchair of this nature is designed in such a manner that the coil spring is arranged around the gas spring. This provides a compact and efficient structure in which the spring forces can act on the same axis.
  • the coil spring, or a combination of coil springs may also be arranged next to or in line with the gas spring.
  • the second spring may also be formed by an additional gas spring or that both the first and second springs may be coil springs.
  • the adjustment element is preferably formed by a ring arranged around the gas spring and a locking screw which projects through the ring.
  • the locking spring may, if appropriate, engage directly on the gas spring if the ring is a continuous ring.
  • the ring may also be an open ring (horseshoe), the ends of which are moved towards one another by the locking screw.
  • the spring element In order to prevent damage to the spring element, it may be accommodated in a telescopic housing.
  • the wheelchair 1 which is illustrated by way of example in Fig. 1 and a few parts of which have been omitted for the sake of clarity of the drawing, comprises a bottom frame 2 and a top frame 3.
  • a pivotable front wheel 5 and a non-pivotable rear wheel 6 are arranged on a longitudinal support 21 of the bottom frame 2.
  • the top frame 3 comprises a longitudinal support 31 on which a seat is arranged.
  • the seat comprises first seat elements 41 and second seat elements 42 which are connected to one another by means of coupling pieces 43.
  • the second seat elements 42 merge into handle 44.
  • a cushion (not shown) may be placed on the seat.
  • the bottom longitudinal support 21 and the top longitudinal support 31 are tiltably connected to one another by means of connecting arms 35 and 36, which are pivotably attached to the longitudinal supports 21 and 22.
  • a spring element 4 is arranged between the top frame 3 and the bottom frame 2 in a manner which will be explained in more detail in Fig. 2.
  • the wheelchair 1 may adopt a front position and a rear position.
  • the seat slopes forward, while in the rear position, indicated by II, it slopes backward.
  • the seat is higher than in the rear position II.
  • Fig. 2 shows a perspective view of the wheelchair of Fig. 1, but with the seat having been omitted for the sake of clarity.
  • the bottom frame comprises longitudinal supports 21 and 22 which are connected to one another by transverse supports 23 and 24.
  • the top frame 3 likewise comprises longitudinal supports 31 and 32 which are connected to one another by transverse supports 33 and 34. Pivotably arranged left-hand connecting arms 35 and 36 and right-hand connecting arms 37 and 38 respectively connect the longitudinal supports 31 and 21, on the one hand, and 32 and 22, on the other hand.
  • a spring element 4 which will be explained in more detail below with reference to Fig. 3, is arranged between the front transverse support 33 of the top frame 3 and the rear transverse support 24 of the bottom frame 2.
  • the spring element 4 is connected to the rear transverse support 24 of the bottom frame 2 with the aid of adjustment members 27 which enable a plurality of predetermined adjustment positions to be reached.
  • the adjustment member 27 comprises small parallel plates with pre-drilled holes through which a bolt which also fits through one end of the spring element 4 can be arranged.
  • the gas spring 7 comprises a cylinder having an end 12 and a piston rod 16, with an end 13, which projects out of the cylinder in a displaceable manner.
  • the cylinder forms the body of the gas spring 7. The pressure of the gas which is present inside the cylinder will press the piston rod outwards.
  • Fig. 3 therefore shows the spring element 4 in the load-free position.
  • the spring element 4 comprises a stop 14 which is attached to the piston rod 16 by means of a nut 15.
  • the coil spring 8 extends between the adjustment element 9 and a buffer plate 11. An opening for accommodating the nut 15 may be formed in the buffer plate 11.
  • the adjustment element 9 is provided with a locking screw 10, by means of which it can be locked in a suitable position on the gas spring 7. With the aid of the adjustment element 9 it is possible to enlarge, if desired, the free travel to the extent that the coil spring 8 does not contribute at all to the assistance of the movement of the upper frame.
  • the construction of the illustrated embodiment of the spring element 4 is such that the forces exerted by both the gas spring 7 and the coil spring 8 are transmitted to the ends 12 and 13.
  • a wheelchair according to the invention makes it easier to move out of the rear (lower) position II due to the double spring action of path C, while moving out of the front (upper) position is counteracted only by the single spring action of path A.
  • Fig. 4 shows the way in which the connecting arms 35 (and 36, 37 and 38) can be connected to the longitudinal support 21 (or 22) of the bottom frame 2.
  • a spacer sleeve 39 which defines a distance D between the longitudinal support 21 and the connecting arm 35, is arranged between the connecting arm 35 itself and the longitudinal support 21.
  • a bolt which is secured by means of a nut, projects through the longitudinal support 21, the spacer sleeve 39 and the connecting arm 35. If appropriate, washers may also be provided.
  • the connecting arms 35 and the spacer sleeve 39 may form a single unit.
  • the length of the spacer sleeve 39 is between approximately 2 and 8 cm, preferably approximately 6 cm. This ensures that the fingers of the user or carer cannot be trapped between the longitudinal support 21 and the connecting arm 35 when tilting the wheelchair. This provides additional safety for the users of the wheelchair.
  • the spring element 4 serves not only to assist with the tilting of the top frame but also to provide a resilient suspension for the top frame.
  • a lockable gas spring it is preferable to use a non-lockable gas spring for the sake of this suspension.
EP99200503A 1998-02-25 1999-02-22 Kippbarer Rollstuhl mit Tragfederelement Withdrawn EP0945114A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29909229U DE29909229U1 (de) 1998-02-25 1999-02-22 Rollstuhl mit einem Stützfederelement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1008418 1998-02-25
NL1008418A NL1008418C2 (nl) 1998-02-25 1998-02-25 Kantelbare rolstoel met ondersteunend veerelement.

Publications (1)

Publication Number Publication Date
EP0945114A1 true EP0945114A1 (de) 1999-09-29

Family

ID=19766615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99200503A Withdrawn EP0945114A1 (de) 1998-02-25 1999-02-22 Kippbarer Rollstuhl mit Tragfederelement

Country Status (3)

Country Link
EP (1) EP0945114A1 (de)
BE (1) BE1011961A3 (de)
NL (1) NL1008418C2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082548A2 (en) * 2003-03-20 2004-09-30 R82 A/S Active wheelchair
US7222868B2 (en) * 2005-06-01 2007-05-29 Steelcase Development Corporation Seating unit with wheelchair base
ITPV20080009A1 (it) * 2008-08-06 2010-02-07 Bruno Gianini Dispositivo di sollevamento per sedie dette comode e carrozzine ad uso di persone diversamente abili ad avanzamento elettrico 12 v.
US11426313B2 (en) * 2019-03-18 2022-08-30 Motion Concepts L.P. Suspension system for power wheelchair stander

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN209091917U (zh) * 2018-06-27 2019-07-12 广州视源电子科技股份有限公司 一种轮椅结构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519649A (en) * 1982-03-26 1985-05-28 Kanagawa Rehabilitation Center Wheelchair
US5011224A (en) * 1989-11-20 1991-04-30 Paul Gerald S Arise-assist chair
WO1994003087A1 (en) * 1992-08-10 1994-02-17 The Mc Q Corporation Lift seat
US5513867A (en) * 1993-08-24 1996-05-07 University Of Utah Seat-lift wheelchair
EP0800809A2 (de) * 1994-11-29 1997-10-15 Richard Van Seenus Nederland B.V. Rollstuhlrahmen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4519649A (en) * 1982-03-26 1985-05-28 Kanagawa Rehabilitation Center Wheelchair
US5011224A (en) * 1989-11-20 1991-04-30 Paul Gerald S Arise-assist chair
WO1994003087A1 (en) * 1992-08-10 1994-02-17 The Mc Q Corporation Lift seat
US5513867A (en) * 1993-08-24 1996-05-07 University Of Utah Seat-lift wheelchair
EP0800809A2 (de) * 1994-11-29 1997-10-15 Richard Van Seenus Nederland B.V. Rollstuhlrahmen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082548A2 (en) * 2003-03-20 2004-09-30 R82 A/S Active wheelchair
WO2004082548A3 (en) * 2003-03-20 2006-05-04 R82 As Active wheelchair
US7404567B2 (en) 2003-03-20 2008-07-29 R82 A/S Active wheelchair
US7222868B2 (en) * 2005-06-01 2007-05-29 Steelcase Development Corporation Seating unit with wheelchair base
ITPV20080009A1 (it) * 2008-08-06 2010-02-07 Bruno Gianini Dispositivo di sollevamento per sedie dette comode e carrozzine ad uso di persone diversamente abili ad avanzamento elettrico 12 v.
US11426313B2 (en) * 2019-03-18 2022-08-30 Motion Concepts L.P. Suspension system for power wheelchair stander

Also Published As

Publication number Publication date
NL1008418C2 (nl) 1999-08-26
BE1011961A3 (nl) 2000-03-07

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