EP0608964A1 - Verstellbare Rückenlehne für einen Rollstuhl - Google Patents

Verstellbare Rückenlehne für einen Rollstuhl Download PDF

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Publication number
EP0608964A1
EP0608964A1 EP94200726A EP94200726A EP0608964A1 EP 0608964 A1 EP0608964 A1 EP 0608964A1 EP 94200726 A EP94200726 A EP 94200726A EP 94200726 A EP94200726 A EP 94200726A EP 0608964 A1 EP0608964 A1 EP 0608964A1
Authority
EP
European Patent Office
Prior art keywords
link
frame member
wheelchair
chassis
seat back
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
EP94200726A
Other languages
English (en)
French (fr)
Other versions
EP0608964B1 (de
Inventor
Mark J. Quintile
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.)
Invacare Corp
Original Assignee
Invacare Corp
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 Invacare Corp filed Critical Invacare Corp
Publication of EP0608964A1 publication Critical patent/EP0608964A1/de
Application granted granted Critical
Publication of EP0608964B1 publication Critical patent/EP0608964B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • A61G5/1056—Arrangements for adjusting the seat
    • A61G5/1067—Arrangements for adjusting the seat adjusting the backrest relative to 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
    • A61G5/1054—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
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • 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
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/125—Rests specially adapted therefor, e.g. for the head or the feet for arms

Definitions

  • each strut comprises a tubular lower member pivotally connected to the chassis below and behind the seat bottom and a rod-shaped upper member pivotally connected to one of the side posts and received in the lower member.
  • the handles for the wheelchair are fixed to the upper ends of the upper strut member which are rotatable about the strut axes.
  • the outer surface of the upper strut member received in the lower strut member has a longitudinally extending flat formed therein and includes thread formed over the remainder of its circumference. These threads mesh with a threaded engagement member brazed on the lower strut member to lock the seat back in a desired angular position relative to the seat bottom.
  • One object of the present invention is to provide a wheelchair with a reclining seat back that can be adjusted easily while the wheelchair is occupied.
  • the seat back assembly of a wheelchair broadly comprises a frame member having a proximal end pivotally connected to the chassis of the wheelchair proximate to the seat bottom and a distal end, the frame member being pivotable relative to the seat bottom of the wheelchair between an upright position and a reclined position, and means for urging the frame member to pivot towards the upright position.
  • the urging means includes a lever arm fixed to the frame member at the proximal end thereof, an extendable link assembly including a first link member having a first end pivotally connected to the lever arm and a second link member having a second end pivotally connected to the chassis, and a spring connected between the first and second link members.
  • the first and second link members move relative to each other along a common link axis as the frame member is pivoted relative to the seat bottom, with the distance between the first end of the first link member and the second end of the second link member decreasing as the frame member is pivoted towards the upright position and increasing the frame member is pivoted towards the reclined position.
  • the spring urges the first and second ends towards each other to urge the frame member towards the upright position.
  • Each chassis half 12A, 12B includes lower chassis bar 18, which is substantially horizontal, and L-shaped upper chassis bar 20. Chassis bars 18 and 20 are connected together by vertical connecting bar 22. Lower chassis bar 18, upper chassis bar 20, and connecting bar 22 preferably are connected by welding to provide rigid chassis halves 12A and 12B.
  • Wheelchair 10 further includes a pair of seat support bars 24, each of which is mounted on the horizontal portion of upper chassis bar 20 of a respective chassis half 12A, 12B. Only one seat support bar 24 is shown in Fig. 1. Wheelchair 10 also includes substantially horizontal seat bottom panel 26 connected between support bars 24. Seat bottom panel 26 preferably is connected to seat support bars 24 by threaded fasteners 27.
  • frame member 36 preferably includes a pair of parallel, spaced-apart side posts 42, each of which includes a proximal end 44 and a distal end 46. Each proximal end 44 is pivotally connected to upper clevis 48 mounted atop connecting bar 22 of its respective chassis half 12A, 12B. Each side post 42 pivots about pivot pin 50 passing through upper clevis 48 and proximal end 44.
  • Frame member 36 also includes a handle 52 fixed to each side post 42 at distal end 46.
  • a handgrip 53 preferably formed of resilient foam rubber, is fitted over each handle 52 to provide greater comfort for the wheelchair attendant.
  • seat back panel 54 is connected between side posts 42. Seat back panel 54 preferably is fastened to side posts 42 by threaded fasteners 55.
  • wheelchair 10 preferably includes connecting bar 56 linking side posts 42 together.
  • Each side post 42 includes connector bracket 58 proximate handle 52.
  • Connector bar 56 is connected to connector brackets 58 by threaded knobs 60, only one of which is shown in Fig. 2.
  • each inner strut member 66 has adjacent its lower end 78 a first engaging surface 82 with a toothed profile.
  • the toothed profile of first engaging surface 82 preferably comprises helical threads.
  • Each outer strut member 64 includes means for rotatably supporting a wheelchair driving wheel.
  • the wheel supporting means includes driving wheel bearings 83, one of which is fixed to each outer strut member 64 proximate its lower end 68, as shown in Fig. 1.
  • Bearings 83 rotatably support driving wheels 14 on outer strut members 64. Consequently, as frame member 36 is pivoted toward its reclined position, as shown in Fig. 3, driving wheels 14 move rearwardly to provide more secure support for the patient sitting in wheelchair 10.
  • Reclining seat back assembly 34 includes means for releasably locking frame member 36 at a desired angle relative to the seat bottom.
  • the locking means includes engaging member 84 movably mounted on each outer strut member 64.
  • Engaging member 84 includes second engaging surface 86 having a profile complimentary to first engaging surface 82 of inner strut member 66.
  • Engaging member 84 preferably is a half nut with second engaging surface 86 comprising helical threads that mate with first engaging surface 82.
  • first and second engaging surfaces 82 and 86 can comprise a variety of complimentary profiles other than helical threaded profiles.
  • Engaging member 84 is disposed within aperture 88 formed in the inwardly facing surface of each outer strut member 64 to permit engagement between engaging surfaces 82 and 86.
  • the locking means also includes means for biasing second engaging surface 86 of each engaging member 84 into engagement with first engaging surface 82 of its respective inner strut member 66 to prevent movement of inner strut members 66 relative to outer strut member 64, thereby, locking frame member 36 at a desired angle.
  • the biasing means includes a pair of coil springs 90, each of which is contained within a spring housing 92 mounted on each outer strut member 64 and covering aperture 88.
  • Spring housing 92 is secured to outer strut member 64 by mounting strap 94, bolts 96, and nuts 98.
  • coil spring 90 is disposed between spring seat 100 of spring housing 92 and spring face 102 of engaging member 84.
  • the locking means of reclining seat back assembly 34 further includes a pair of actuating levers 104 pivotally mounted on frame member 36 at the distal end thereof. Specifically, each actuating lever 104 is pivotally connected to a lever bracket 106 fixed to distal end 46 of each side post 42 immediately beneath handle 52.
  • the locking means also includes means for linking actuating lever 104 to engaging member 84 so that pivoting actuating lever 104 in a preselected direction moves engaging member 84 against the biasing means of coil spring 90 to disengage first and second engaging surfaces 82,86 and permit movement of inner strut members 66 relative to outer strut members 64.
  • the linking means includes a pair of Bowden cable assemblies 108.
  • Each Bowden cable assembly 108 includes a sheathed wire 110 having engaging lugs 112 and 113 at its upper and lower ends, respectively.
  • Each Bowden wire assembly 108 is connected to a respective side post 42 by straps 114.
  • Engaging lug 112 at the upper end of each Bowden cable assembly is connected to actuating lever 104, and the lower engaging lug 113 is connected to engaging member 84.
  • Actuating levers 104 and engaging members 84 are provided with slots to accommodate engaging lugs 112, 113.
  • Bowden cable assembly 108 also includes upper and lower ferrules 116, 117 which are threaded into strut bracket 74 and spring housing 92, respectively. Ferrules 116, 117 preferably are secured in place by nuts 118.
  • actuating levers 104 can be located in a number of positions, it is preferred to position them immediately beneath handles 52 and to orient the Bowden cable assembly so that upward pivoting of levers 104 disengages engaging member 84.
  • the wheelchair attendant imparts an upward force of the seat back assembly when disengaging the locking means. Consequently, the attendant is better able to support the weight of the released seat back, which is particularly important when the wheelchair is occupied by a patient.
  • the reclining seat back assembly includes means for urging frame member 36 to pivot toward an upright position relative to the seat bottom.
  • the urging means includes a pair of lever arms 120, each of which is fixed to proximal end 44 of a side post 42.
  • lever arm 120 is T-shaped, with its cross arm perpendicular to side post 42. Each lever arm 120 extends beyond pivot pin 50 of its respective side post.
  • the urging means also includes an extendable link assembly 122.
  • link assembly 122 includes tubular first link assembly member 126.
  • Second link member 126 has a smaller diameter than first link member 124, is received within first link member 124, and can slide axially with respect to first link member 124 along a link axis 128.
  • Affixed to the upper end of first link member 124 is connecting rod 130, which is pivotally connected to one end of the cross arm of lever arm 120 by pin 132.
  • lower end 134 of second link member 126 is pivotally connected to mounting lug 136 affixed to the underside of lower chassis bar 18 by pin 138.
  • first and second link members 124, 126 move relative to each other along link axis 128 as frame member 36 is pivoted between the upright position shown with solid lines and the reclined position shown with phantom lines.
  • the distance between connecting bar 130 at the upper end of first link member 124 and lower end 134 of second link member 126 decreases as frame member 36 is pivoted toward the upright position and increases as frame member 36 is pivoted toward the reclined position.
  • a spring is connected between first link member 124 and second link member 126 to urge contraction of link assembly 122 and urge frame member 36 toward the upright position.
  • the spring comprises coil tension spring 140, which has one end connected to pin 138 at lower end 134 and a second end connected to pin 142 at the upper end of first link member 124.
  • link assembly 122 includes first link member 143, which is comprised of piston rod 144 having is upper end pivotally connected to lever arm 120 by pin 146. Piston head 148 is fixed to the lower end of piston rod 144.
  • First link member 143 is slidably received within tubular second link member 150, which is pivotally connected at its lower end to mounting lug 136 by pin 152.
  • stopper member 154 Surrounding piston rod 144 at the upper end of second link member 150 is stopper member 154, which serves as a spring support for compression coil spring 156, which spirals around piston rod 144 between stopper member 154 and the underside of piston head 148. Spring 156 urges piston head 148 towards the lower end of second link member 150, which in turn urges the seat back assembly towards the upright position.
  • lever arm 120 is substantially T-shaped and is connected to the upper end of link assembly 122 at a position spaced forwardly from a plane passing through side posts 42.
  • the preferred shape shown in the drawings enables use of the same lever arm on either the right or left side post.
  • L-shaped lever arms also can be used to achieve the same leverage effect as shown in the drawings.
  • a straight lever arm can be used.

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)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
EP94200726A 1989-06-21 1990-06-21 Verstellbare Rückenlehne für einen Rollstuhl Expired - Lifetime EP0608964B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US36964589A 1989-06-21 1989-06-21
US369645 1989-06-21
EP90306802A EP0404574B1 (de) 1989-06-21 1990-06-21 Rollstuhl

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP90306802A Division EP0404574B1 (de) 1989-06-21 1990-06-21 Rollstuhl
EP90306802.1 Division 1990-06-21

Publications (2)

Publication Number Publication Date
EP0608964A1 true EP0608964A1 (de) 1994-08-03
EP0608964B1 EP0608964B1 (de) 1995-10-25

Family

ID=23456310

Family Applications (2)

Application Number Title Priority Date Filing Date
EP94200726A Expired - Lifetime EP0608964B1 (de) 1989-06-21 1990-06-21 Verstellbare Rückenlehne für einen Rollstuhl
EP90306802A Expired - Lifetime EP0404574B1 (de) 1989-06-21 1990-06-21 Rollstuhl

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP90306802A Expired - Lifetime EP0404574B1 (de) 1989-06-21 1990-06-21 Rollstuhl

Country Status (5)

Country Link
EP (2) EP0608964B1 (de)
JP (1) JPH0337063A (de)
DE (2) DE69013586T2 (de)
FR (1) FR2648705B1 (de)
GB (2) GB2233221B (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2295538B (en) * 1994-12-01 1998-01-14 Keymed Support apparatus
AU2236699A (en) * 1998-02-03 1999-08-23 Sunrise Medical Hhg Inc. Seat back recliner kit for wheelchair
GB9911026D0 (en) * 1999-05-13 1999-07-14 Wilstead Ltd Wheelchair
CN1666169B (zh) 2002-05-16 2010-05-05 索尼株式会社 输入方法和输入装置
JP4644029B2 (ja) * 2005-04-28 2011-03-02 株式会社松永製作所 フットレストの取付け構造
CN210494426U (zh) 2019-05-08 2020-05-12 明门(中国)幼童用品有限公司 背靠调整机构及具有该机构的看护车

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2792876A (en) * 1955-12-22 1957-05-21 Colson Corp Reclinable chair construction
DE7235052U (de) * 1973-01-18 Meyer W Fa Krankenfahrstuhl
DE2545991A1 (de) * 1974-10-15 1976-04-29 Landstingens Inkopscentral Stuhl mit schwenkbarem rueckenlehnenrahmen
DE2540054A1 (de) * 1975-09-09 1977-03-17 Everest & Jennings Verstellbare rueckenlehne fuer einen krankenstuhl
FR2454800A1 (fr) * 1979-04-24 1980-11-21 Ortopedia Gmbh Dispositif de reglage de l'inclinaison du dossier d'un fauteuil roulant, ou analogue
DE8711762U1 (de) * 1987-08-30 1987-11-05 Kerstholt, Fritz, 5778 Meschede, De

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4487453A (en) * 1982-12-27 1984-12-11 Gendron, Inc. Seat recliner adjustment mechanism
US4655471A (en) * 1986-01-13 1987-04-07 Peek Gregory A Wheelchair having adjustable backrest

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7235052U (de) * 1973-01-18 Meyer W Fa Krankenfahrstuhl
US2792876A (en) * 1955-12-22 1957-05-21 Colson Corp Reclinable chair construction
DE2545991A1 (de) * 1974-10-15 1976-04-29 Landstingens Inkopscentral Stuhl mit schwenkbarem rueckenlehnenrahmen
DE2540054A1 (de) * 1975-09-09 1977-03-17 Everest & Jennings Verstellbare rueckenlehne fuer einen krankenstuhl
FR2454800A1 (fr) * 1979-04-24 1980-11-21 Ortopedia Gmbh Dispositif de reglage de l'inclinaison du dossier d'un fauteuil roulant, ou analogue
DE8711762U1 (de) * 1987-08-30 1987-11-05 Kerstholt, Fritz, 5778 Meschede, De

Also Published As

Publication number Publication date
EP0404574A2 (de) 1990-12-27
FR2648705B1 (fr) 1997-12-26
GB2256132A (en) 1992-12-02
DE69023251T2 (de) 1996-04-04
DE69013586T2 (de) 1995-03-02
JPH0337063A (ja) 1991-02-18
GB2233221A (en) 1991-01-09
GB2233221B (en) 1993-03-03
EP0404574A3 (de) 1991-10-30
GB9215565D0 (en) 1992-09-02
GB9013865D0 (en) 1990-08-15
EP0608964B1 (de) 1995-10-25
EP0404574B1 (de) 1994-10-26
DE69023251D1 (de) 1995-11-30
FR2648705A1 (fr) 1990-12-28
GB2256132B (en) 1993-03-10
DE69013586D1 (de) 1994-12-01

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