WO2012041890A1 - Appareil d'inclinaison de siège - Google Patents

Appareil d'inclinaison de siège Download PDF

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Publication number
WO2012041890A1
WO2012041890A1 PCT/EP2011/066833 EP2011066833W WO2012041890A1 WO 2012041890 A1 WO2012041890 A1 WO 2012041890A1 EP 2011066833 W EP2011066833 W EP 2011066833W WO 2012041890 A1 WO2012041890 A1 WO 2012041890A1
Authority
WO
WIPO (PCT)
Prior art keywords
seat
base member
tilt apparatus
cam surface
supporting member
Prior art date
Application number
PCT/EP2011/066833
Other languages
English (en)
Inventor
Håkan BERGMAN
Original Assignee
Permobil 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 Permobil Ab filed Critical Permobil Ab
Priority to EP20110766946 priority Critical patent/EP2621444B1/fr
Priority to CN201180047643.6A priority patent/CN103209667B/zh
Publication of WO2012041890A1 publication Critical patent/WO2012041890A1/fr

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
    • A61G5/1056—Arrangements for adjusting the seat
    • A61G5/1075—Arrangements for adjusting the seat tilting the whole seat backwards
    • 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
    • A61G5/04—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven
    • A61G5/041—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven having a specific drive-type
    • A61G5/042—Front wheel drive

Definitions

  • the present invention relates generally to electric
  • the invention also relates to a wheelchair provided with such an apparatus.
  • Wheelchairs especially electrically driven wheelchairs often have means for adjusting the position of the seat in relation to the chassis.
  • These means may comprise a seat lift for vertically adjusting the height of the seat and a backrest tilt arrangement for tilting the backrest of the seat in relation to the bottom of the seat, i.e. for changing the angle between the backrest and the bottom of the seat.
  • Modern wheelchairs may additionally be provided with an electrically driven seat tilt apparatus, by which the entire seat, including the bottom and backrest may be tilted in relation to the chassis of the wheelchair.
  • seat tilt apparatuses are provided for facilitating changing the body weight of the wheelchair occupant, to thereby avoid injuries, numbness and other inconveniences otherwise caused by static positioning of the occupant.
  • the entire seat is tilted around a transverse horizontal axis, which axis is stationary in relation to the chassis. While allowing easy change of the occupant's body weight, this known type of seat tilt causes the center of gravity of the seat and occupant to move backwards during tilting. Such backward movement of the center of gravity is disadvantageous since it decreases the stability of the wheelchair and may even cause the wheelchair to fall over. In order to solve this problem different so-called constant center of gravity seat tilt devices have been suggested. At these types of seat tilt arrangements the axis around which the seat is tilted moves forwardly during the tilting
  • a seat frame which, at a rear end, is pivotally connected to a transverse support member.
  • the support member is guided in opposing horizontal linear slots arranged in a base frame of the wheelchair.
  • the seat frame is also connected to the base frame by means of a tilt arm linkage, which is formed of two bars that are pivotally connected to opposing sides of the seat frame, forward of its rear end, and to the base frame.
  • An electrical drive member is at a forward end connected to the base frame and at a rear end connected to the transverse support member.
  • US 2007/0102615 Al discloses another seat tilt apparatus comprising a base member with a guide slot, a seat supporting member which is movable in relation to the base member by means of a linear drive member and guided by the guide slot and a pivotal arm connecting the base member and the seat supporting member.
  • the guide slot comprises two portions arranged at mutually different directions of extension.
  • Another object is to provide such a seat tilt apparatus, which is simple in construction and reliable in use.
  • a still further object is to provide such a seat tilt
  • Yet another object is to provide such a seat tilt apparatus at which the required power for achieving tilting may be kept comparatively low.
  • Still another object is to provide such a seat tilt apparatus at which the relation between required power and the angular alteration may be easily adapted for different motion
  • One aspect of the invention concerns a seat tilt apparatus for a wheelchair, which wheelchair comprises a chassis and a seat.
  • the seat tilt apparatus comprises a base member, which is fixable to the chassis and provided with at least one first guide slot.
  • a seat supporting member is arranged to
  • a linear drive means is connected to the base member and to the seat
  • the seat supporting member for moving the seat supporting member along a motion path, in relation to the base member.
  • the seat supporting member comprises at least one first cam surface facing in a first direction.
  • the base member comprises at least one first rotational support member. Said first cam surface is arranged to be in supporting contact with said first rotational support member and formed for altering the angle between the seat supporting member and the base member during movement along a first interval of said motion path.
  • the axis of rotation for the tilting movement is moved forward in relation to the chassis during backward tilting of the seat.
  • the center of gravity of the seat and occupant is readily kept generally at a constant longitudinal position in relation to the chassis.
  • the change of tilt angle in relation to the longitudinal displacement of the first cam surface relative to the first rotational support member corresponds to the gear ratio of the tilt apparatus.
  • the gear ratio is thereby determined by the shape of the first cam surface along its longitudinal extension, i.e. by the longitudinal curvature of the cam surface.
  • longitudinal curvature of the first cam surface may e.g. be selected such that the gear ratio is low at the beginning of a tilting movement of the seat support member from a horizontal position, where the gravity acting on the seat and the
  • the cam surface curvature may further be selected such that the gear ratio gradually increases as the seat support member assumes a gradually increasing tilt angle, whereby the counteraction caused by the gravity decreases.
  • reliable and fast tilting may be achieved at a comparatively low power consumption also when heavy loads are acting on the seat support member.
  • the invention also allows for that a comparatively small electric motor having low power consumption may be utilized.
  • the seat supporting member preferably comprises at least one second cam surface facing in a second direction, which is opposite to said first direction.
  • the gravity acting on the seat and occupant will initially counteract the tilting movement.
  • the gravity will instead act in a direction of continued backward tilting.
  • the second cam surface and the second rotational support member are arranged for counteracting the gravitational force acting in a
  • the seat tilt apparatus allows for a readily and comfortably controlled tilting movement also when the gravitational force act in the tilting direction.
  • the gravitation will strive to continue the forward tilting.
  • the first cam surface and first rotational support member counteracts the gravity to break and control the forward tilting motion.
  • the first and second cam surfaces and rotational support members cooperate to drive and to brake and control the tilting movement at respective sides of the angle of equilibrium.
  • the seat supporting member may comprise a mounting plate for a seat and at least one guide member which is arranged generally perpendicular to the mounting plate and the first cam surface may be arranged at an outer edge of said guide member.
  • a second guide slot may be arranged in said at least one guide member and the at least one second cam surface may be arranged at an edge of said second guide slot.
  • the seat tilt apparatus may comprise a resilient means for pretension of said at least one second rotational support member towards said at least one second cam surface.
  • the resilient means contribute to achieving a smooth and
  • the resilient means allows for that the cam surfaces may be machined and fabricated with a comparatively low accuracy and that the rotating support members, during assembly may be positioned with a reduced accuracy .
  • the linear drive means may comprise an electrical motor fixed to the base member; a rotational threaded rod connected to the motor and a drive member which is threaded onto the threaded rod and fixed to the seat supporting member.
  • the base member may comprise two first guide slots, two first rotational support members and two second rotational support members, each of the first guide slots, the first rotational members and the second rotational members being arranged at opposing lateral sides of the base member.
  • the seat supporting member may then comprise a seat mounting plate and two guide members arranged generally perpendicular to the mounting plate, at respective lateral sides of the seat mounting plate, each guide member comprising a respective first cam surface and a respective second cam surface. This allows for that the tilting motion is guided and controlled at each lateral side of the seat support member. Hereby the stability and balance of the apparatus is enhanced.
  • This embodiment further results in that the load exerted by the seat and occupant is equally distributed to both sides of the apparatus, whereby the dimensions of load carrying parts may be reduced corre ⁇ spondingly.
  • the linear drive means may be arranged centrally between and generally in parallel with the lateral sides of the base member and the seat supporting member.
  • a reliable and well balanced drive of the tilt motion may be accomplished by means of a single, comparatively small drive means having a comparatively low power consumption.
  • the invention concerns a wheelchair comprising a chassis, a seat and a seat tilt apparatus as set out above.
  • Fig. 1 is a schematic front perspective view of a wheelchair provided with a seat tilt apparatus according to the
  • Fig. 2 is a perspective view of the seat tilt apparatus schematically illustrated in fig. 1
  • Fig. 3 is a an exploded view in perspective illustrating some parts of the seat tilt apparatus shown in fig. 2.
  • Figs. 3a-c are side views showing the seat tilt apparatus in different positions, corresponding to the seat being
  • Fig. 1 shows an electrical wheelchair comprising a chassis 1, a seat 2 and a seat tilt apparatus 3 according to one
  • the chassis supports two front wheels 4, which are driven by electrically powered motors and a pivotal rear wheel 5.
  • the chassis also comprise an
  • the seat lift is in its lowest position .
  • the seat 2 comprises a seat bottom 7, a backrest 8 and arm rests 9, which armrests are connected to the backrest 8.
  • the backrest 8 is fixedly connected to the seat bottom 7.
  • the backrest 8 may however also be pivotal in relation to the seat bottom by means of a backrest tilt arrangement, which is known per se to the skilled person.
  • the seat bottom 7 is further fixed to a seat frame 6, which also supports a leg rest 10.
  • the seat frame 6 is fixed to the seat tilt apparatus 3 and the seat tilt apparatus is in turn fixed to a vertically movable part of the seat lift device.
  • the seat tilt apparatus comprises a base member 11, which is shown separately in fig. 3.
  • the base member 11 comprises, at a front end, a central mounting plate 12 with a plurality of mounting holes 13 for being secured by screws or the like to the vertically movable part of the seat lift or to a stationary part of the chassis. Hence, the seat lift may be omitted if desired.
  • the base member 11 also comprises a left hand side member 14a and a right hand side member 14b.
  • the side members 14a, 14b extend downwards from the mounting plate 12 in parallel to each other and perpendicular to the mounting plate 12. In the shown embodiment the side members 14a, 14b are separate parts fixedly secured to the mounting plate 12.
  • the mounting plate 12 and side members may however also form an integral part.
  • a first guide slot 16 is formed in each side member 14a, 14b. Each guide slot 16 is generally rectilinear.
  • a linear drive means 17 is fixed to the base member 11.
  • the linear drive means comprises an electric motor 18, a gear device 19, a rotational threaded rod 20 and a drive member 21, which is threaded onto and rotary relative to the rod 20.
  • the threaded rod 20 is connected to the motor 18 via the gear device 19.
  • the linear drive means 17 is fixed to the base member 11 by means of a mounting bracket 22 and fastening screws 23, 24.
  • the threaded rod 20 extends from the gear device 19, generally central between and in parallel with the side members 14 of the base member 11.
  • the base member 11 further comprises two rotational support assemblies 30.
  • rotational support assembly 30 In fig. 3 only one such rotational support assembly 30 being attached to the right hand side member 14b is shown.
  • the exemplifying seat tilt apparatus 3 also comprises a further rotational support assembly 30 which is attached to the left hand side member 14a.
  • the rotational support assembly 30 attached to the right hand side member 14b will be described in detail. It is however realized that the
  • exemplifying seat tilt apparatus described also comprises a corresponding rotational support assembly attached to the left hand side member 14a.
  • the rotational support assembly 30 comprises a first
  • the assembly 30 also comprises a second
  • rotational support member 33 in the form of a roller
  • the second rotational support member 33 is fixed to and between two mounting plates 34, 35, by means of a bolted joint 36a-c.
  • the mounting plates 34, 35 are engaged with each other by means of overlapping engagement tongues 34a, 35a.
  • the two mounting plates 34, 35, and thereby the second rotational support member 33 are pivotally fixed to the right hand side member 14b, by means of a bolt 37a, a bearing sleeve 37b and a nut 37c.
  • the rotational support assembly also comprises a resilient means 38 for pretension of the second rotational support member 33.
  • the resilient means comprises a threaded bolt 38a which is received in a sleeve 38b having a radial collar at one end.
  • a number of spring washers 38c are slipped onto the sleeve 38b and compressed between the radial collar of the sleeve and a lower surface of a folded tongue 38d of the side member 14b.
  • the bolt 38a is slipped through a hole in the tongue 38d and threadedly received in a threaded hole 38e arranged in the engagement tongue 34a of mounting plate 34.
  • the two mounting plates 34, 35 are resiliently urged to pivot about the bolt 37a in the anti-clockwise direction as seen in fig. 3.
  • the second rotational support member 33 is
  • the seat tilt apparatus 3 further comprises a seat supporting member 40.
  • the seat supporting member 40 comprises a seat mounting plate 41, a left hand guide member 42a and a right hand guide member 42b.
  • the guide members 42, 42b are arranged at respective lateral sides of the seat mounting plate and project downwardly therefrom, generally in parallel with each other.
  • the guide members 42a, 42b are separate parts fixedly secured to the seat mounting plate 41.
  • the seat mounting plate 41 and the guide members 42a, 42b may however also form an integral part.
  • a shaft 50 is pivotally fixed to and between the rear ends of the guide members 42a, 42b.
  • the shaft 50 exhibits a central hole 51 in which the drive member 21 is fixed.
  • the drive member 21 is thus prevented from rotation relative to the shaft 50.
  • a respective guide roller 52 is rotary arranged at each end of the shaft 50.
  • the guide rollers 52 are received in and guided by a respective first guide slots 16 arranged in the side members 14a, 14b.
  • the shaft 50 and the guide rollers 52 are pivotally fixed to the seat supporting member 40 by means of screw joints 53a-c.
  • the screw joints 53a-c extend through a hole 54 in the respective guide member 42a, 42b and through a respective guide roller 52 and are threadedly secured to a respective end of the shaft 50.
  • the guide member 42b exhibits a first cam surface 43, which is arranged at an outer and downwardly facing edge of the guide member 42b.
  • the cam surface 43 has a generally convex curved shape along its longitudinal extension.
  • a second guide slot 44 is arranged in the guide member 42b.
  • a lower edge of the second guide slot 44 forms a second cam surface 45 which faces in the opposite direction with regard to the first cam surface 43.
  • the second cam surface is arranged generally in parallel with the first cam surface 43, such that the distance between the first 43 and second 45 cam surfaces is essentially
  • the base member 11 and the seat supporting member 40 are arranged such that the first cam surface 43 on each lateral side bears against the respective first rotational support member 31.
  • Each second rotational support member 33 is
  • the seat tilt apparatus 3 is shown in a starting position.
  • the seat supporting member 40 is arranged in a generally horizontal position.
  • the guide rollers 52 are positioned in the rear end of the respective first guide slot 16. This position of the seat tilt apparatus corresponds to that the seat 2 is in a non-tilted normal position.
  • the electric motor 18 When the seat is to be tilted backwards, the electric motor 18 is activated to rotate in a first rotational direction.
  • the threaded rod 20 thereby rotates in a corresponding rotational direction.
  • the drive member 21, which is threadedly arranged on the rod 20, is thereby displaced forwardly along the rod 20.
  • the drive member 21 forces, via shaft 50, the seat
  • the front portion of the seat supporting member will be lifted upwards, whereby the seat supporting member is tilted backwardly about a tilt pivot axis defined by the centers of the guide rollers 52.
  • the curvature of the first cam surfaces 43 are, along a longitudinal portion corresponding to initial tilting, arranged in relation to the first rotational support members and to the direction of extension of the first guide slot 16, such that a certain length of forward displacement of the guide rollers 52 results in a comparatively small lifting of the front portion of the seat supporting member.
  • the gear ratio of the seat tilt apparatus is thus comparatively low, such that the power required for the initial tilting, at which the gravity fully counter-acts the tilting movement, may be kept comparatively low.
  • the resilient means 38 ensures that there is no play between the rotating support members and the cam surfaces such that the angle of
  • the longitudinal curvature of the second cam surface 45 is shaped such that the gear ratio increases during the tilting movement from the angle of equilibrium (fig. 4b) to the fully tilted position (fig. 4c) .
  • the fully backward tilted position corresponds to a tilt angle of approximately 50 ° from the horizontal starting position.
  • the longitudinal direction of the first guide slots 16 are arranged forwardly sloping, with an angle of inclination of approximately 5,5 ° to the horizontal plane. This allows for that the comparatively large maximum tilt angle may be achieved with a comparatively short active length of the threaded rod 20 while still keeping the active lengths of the cam surfaces comparatively short.
  • the seat tilt apparatus further comprises a comparatively low number of moving parts which enhances reliability and service life and reduces the need of maintenance.
  • the apparatus also allows for a space saving construction and especially for that the constructional height may be kept low.
  • exemplifying embodiments of the invention have been described and illustrated. However, the invention should not be seen as limited to these embodiments but may be varied within the scope of the appended claims. In cases where the required tilt angle range does not exceed the angle of equilibrium it might be possible to dispense with the second cam surface and the second rotating support member. In cases where only a limited total load is to be applied to the seat support member, the seat tilt apparatus may comprise only one first cam surface and one first rotating support member.
  • cam surfaces may be varied, e.g. for accomplishing any desired varied gear ratio of the seat tilt apparatus during the tilting movement.

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)
  • Seats For Vehicles (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)

Abstract

La présente invention concerne un appareil d'inclinaison de siège (3) pour fauteuil roulant électrique, comprenant un châssis (1) et un siège (2). Ledit appareil d'inclinaison de siège comporte les éléments suivants : un élément de base (11), qui peut être fixé au châssis et est pourvu d'au moins une première fente de guidage (16) ; un élément de support de siège (40) qui est disposé pour accueillir ledit siège en le soutenant, est mobile par rapport à l'élément de base et est guidé par la première fente de guidage ; et un moyen d'entraînement linéaire (17) qui est relié à l'élément de base et à l'élément de support de siège, destiné à déplacer ledit élément de support de siège le long d'une trajectoire de mouvement, par rapport à l'élément de base. Ledit élément de support de siège comprend au moins une première surface de came (43) en regard d'une première direction. Ledit élément de base comprend au moins un premier élément de support rotationnel (31). Ladite première surface de came est disposée pour être en contact avec le premier élément de support rotationnel tout en le soutenant, et est formée de manière à modifier l'angle entre l'élément de support de siège et l'élément de base durant le mouvement le long d'un premier intervalle de ladite trajectoire de déplacement. L'invention a également trait à un fauteuil roulant électrique pourvu de cet appareil d'inclinaison de siège.
PCT/EP2011/066833 2010-09-30 2011-09-28 Appareil d'inclinaison de siège WO2012041890A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20110766946 EP2621444B1 (fr) 2010-09-30 2011-09-28 Appareil d'inclinaison de siège
CN201180047643.6A CN103209667B (zh) 2010-09-30 2011-09-28 座椅倾斜设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1051018-8 2010-09-30
SE1051018 2010-09-30

Publications (1)

Publication Number Publication Date
WO2012041890A1 true WO2012041890A1 (fr) 2012-04-05

Family

ID=44764121

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/066833 WO2012041890A1 (fr) 2010-09-30 2011-09-28 Appareil d'inclinaison de siège

Country Status (3)

Country Link
EP (1) EP2621444B1 (fr)
CN (1) CN103209667B (fr)
WO (1) WO2012041890A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6032976A (en) 1997-09-08 2000-03-07 Sunrise Medical Hhg Inc. Wheelchair with tilting seat
US6106065A (en) * 1997-10-24 2000-08-22 Reliance Medical Products, Inc. Examination chair with lifting and tilting mechanism
WO2004039299A2 (fr) * 2002-10-28 2004-05-13 Papac James B Siege orientable pour fauteuil roulant
US20040188979A1 (en) * 2003-03-31 2004-09-30 Todd Bernatsky Center-of-gravity tilt-in-space wheelchair
EP1621170A2 (fr) * 2004-07-30 2006-02-01 Hill-Rom Services, Inc. Table de support d'un patient avec un appareil de longueur réglable, système et procédé
US20060026765A1 (en) * 2004-07-30 2006-02-09 Hornbach David W Advanced articulation system and mattress support for a bed
US20070102615A1 (en) 2005-10-21 2007-05-10 Permobil Ab Seat tilt apparatus for a wheelchair
WO2008036018A1 (fr) * 2006-09-19 2008-03-27 Permobil Ab Siège pour fauteuil roulant et procédé de variation de l'angle entre une partie d'assise et un dossier

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6032976A (en) 1997-09-08 2000-03-07 Sunrise Medical Hhg Inc. Wheelchair with tilting seat
US6106065A (en) * 1997-10-24 2000-08-22 Reliance Medical Products, Inc. Examination chair with lifting and tilting mechanism
WO2004039299A2 (fr) * 2002-10-28 2004-05-13 Papac James B Siege orientable pour fauteuil roulant
US20040188979A1 (en) * 2003-03-31 2004-09-30 Todd Bernatsky Center-of-gravity tilt-in-space wheelchair
EP1621170A2 (fr) * 2004-07-30 2006-02-01 Hill-Rom Services, Inc. Table de support d'un patient avec un appareil de longueur réglable, système et procédé
US20060026765A1 (en) * 2004-07-30 2006-02-09 Hornbach David W Advanced articulation system and mattress support for a bed
US20070102615A1 (en) 2005-10-21 2007-05-10 Permobil Ab Seat tilt apparatus for a wheelchair
WO2008036018A1 (fr) * 2006-09-19 2008-03-27 Permobil Ab Siège pour fauteuil roulant et procédé de variation de l'angle entre une partie d'assise et un dossier

Also Published As

Publication number Publication date
CN103209667A (zh) 2013-07-17
EP2621444B1 (fr) 2015-04-22
CN103209667B (zh) 2016-05-04
EP2621444A1 (fr) 2013-08-07

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