EP2050424B1 - Chaise roulante - Google Patents

Chaise roulante Download PDF

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Publication number
EP2050424B1
EP2050424B1 EP07803634A EP07803634A EP2050424B1 EP 2050424 B1 EP2050424 B1 EP 2050424B1 EP 07803634 A EP07803634 A EP 07803634A EP 07803634 A EP07803634 A EP 07803634A EP 2050424 B1 EP2050424 B1 EP 2050424B1
Authority
EP
European Patent Office
Prior art keywords
arms
transmission element
arm
seat part
seat
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.)
Not-in-force
Application number
EP07803634A
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German (de)
English (en)
Other versions
EP2050424A1 (fr
Inventor
Manex San Martin Palacios
Aitor Olarra Urberuaga
Fernando EGAÑA FARIZO
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.)
Fundacion Tekniker
Original Assignee
Fundacion Tekniker
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Publication date
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Publication of EP2050424A1 publication Critical patent/EP2050424A1/fr
Application granted granted Critical
Publication of EP2050424B1 publication Critical patent/EP2050424B1/fr
Not-in-force 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
    • A61G5/1059—Arrangements for adjusting the seat adjusting the height of the seat
    • 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 is comprised in the field of wheelchairs and, more specifically, in that of adjustable wheelchairs with regard to their height and/or tilting.
  • wheelchairs for example, to facilitate the access of the user to objects located at a certain height
  • wheelchairs allowing the tipping of the seat, backwards (for example, to provide a more comfortable position for the user) and/or forwards (for example, to facilitate the movement of the user from the chair to a bed, to a seat or to a vehicle).
  • the chairs normally only incorporate some of the mentioned functionalities since different mechanisms are required for each of them (namely, tilting mechanisms and elevation mechanisms), which increase the cost of the chair, its weight, its size and/or its complexity.
  • Examples of known wheelchairs with some type of tipping and/or height movement mechanism of the seat are described in, for example, WO-A-03/086261 , WO-A-2004/021953 , WO-A-01/32120 , WO-A-01/91688 , WO-A-01/91687 , WO-A-02/26186 , WO-A-03/034967 , WO-A-2005/007498 , WO-A-99/17699 , WO-A-98/52509 , WO-A-97/23187 and EP 1506760-A1 .
  • the invention relates to a wheelchair, comprising a seat part (which can comprise the seat properly speaking, a backrest, armrest and/or footrest) and a lower part (which basically can comprise the frame of the wheelchair, the wheels allowing the chair to roll on a surface, and several transmission mechanisms, motors, etc.).
  • the seat part is assembled on the lower part and coupled thereto by means of a coupling mechanism configured such that, when the lower part is located on a horizontal surface,
  • the coupling mechanism comprises at least two arms which are articulated to the seat part and to the lower part, each of said arms being articulated to said lower part, at a corresponding articulation point (and according to a corresponding pivoting shaft), pivotably with respect to the lower part, such that, to elevate the seat part to a maximum height position from a minimum height position with respect to the lower part, one of said arms must pivot, with respect to its articulation point or articulation pin and viewed from a side of the wheelchair, in a first direction (for example, clockwise), and another of said arms must pivot, with respect to its articulation point or articulation pin and viewed from the same side of the wheelchair, in a second direction (for example, counter-clockwise) opposite said first direction, such that the angular positions of the arms with respect to their coupling points for coupling to the lower part (for example, the orientation of the arms in the vertical plane which contains them) determine both the height position and the tilting of the seat part, with respect to the lower part.
  • One of the arms can have its coupling point for coupling to the lower part located in correspondence with a front part of the lower part (for example, at a distance from the front end of the lower part the distance of which can be less than a quarter -or eighth- of the length of the lower part) and in correspondence with a first side of the lower part (for example, at a distance from said first lower side the distance of which is less than a quarter -or eighth- of the width of the lower part), and in which another of said arms has its coupling point for coupling to the lower part located in correspondence with a rear part of the lower part (for example, at a distance from the rear end of the lower part the distance of which can be less than a quarter --or eighth-of the length of the lower part) and in correspondence with a second side of the lower part opposite said first side of the lower part (for example, at a distance from said second side the distance of which is less than a quarter - or eighth- of the width of the lower part).
  • Said coupling points can be located in diagonal
  • Each arm is articulated to the seat part by means of at least one pivoting link.
  • At least one of the arms is articulated to said seat part by means of said pivoting link between said arm and a connecting rod, bar or the like, said connecting rod or bar in turn being coupled to said seat part by means of another pivoting link, such that said connecting rod or bar can pivot with respect to the seat part.
  • This can facilitate the conversion of the angular movement of the arms into an elevation movement of the seat part without causing a tipping of the seat part, i.e., its tilting being maintained.
  • Another of the arms can be linked to said seat part by means of its pivoting link directly between said arm and an element rigidly linked to or integrated into the seat part.
  • Each arm can be angularly moveable by means of an actuator, for example, by means of an electric linear actuator.
  • Said actuator can be coupled to the corresponding arm by means of a transmission mechanism which can comprise a first transmission element or lever coupled by means of a pivoting link to a mobile part of the actuator, and a second transmission element or bar linked by means of a first pivoting link to said first transmission element or lever and by means of a second pivoting link to said arm.
  • the first transmission element or lever can be provided with a rotating element (for example, a pulley or wheel) configured such that it is supported on a lower surface of the arm for at least one part of the angular movement of the arm with respect to its articulation point for articulating to the lower part, whereby it can serve to discharge the forces exerted on the actuator for at least one part of the movement.
  • Said first pivoting link between the first transmission element and the second transmission element can be located in an area of the first transmission element located between the pivoting link between the first transmission element and the mobile part of the actuator, and the rotating element or pulley.
  • the first pivoting link between the first transmission element and the second transmission element can be located in an area of the first transmission element located between the pivoting link between the first transmission element and the mobile part of the actuator, and a connection area of the first transmission element for connecting to a spring (which can coincide with the position of the rotating element), in which case the wheelchair can also include said spring.
  • the actuator can be assembled pivotably on a third transmission element in turn assembled pivotably.
  • the arm can be assembled pivotably on this third transmission element.
  • the first and the second transmission elements can be configured such that, from a certain angular position of the arm in an elevation movement of the seat part, the first transmission element abuts against the second transmission element, such that the pivoting or rotation between the first transmission element and the second transmission element is prevented from continuing, such that one of said elements can "push" the other without there being rotation between the elements.
  • a first of said arms can have its articulation point located further forwards in the lower part than the articulation point of a second of said arms, said first arm being extended backwards from its articulation point and said second arm being extended forwards from its articulation point.
  • the two arms can form an "X" in at least some positions of the seat part.
  • Said at least two arms can, for example, improve the stability of the system, comprise four arms, which can make up two pairs of arms, each pair of arms comprising two arms according to what has been described above.
  • Each "pair" can correspond to a diagonal of the wheelchair, viewed from above.
  • Figures 1A and 1B show side elevational side views of the wheelchair according to an embodiment of the invention, with the seat part 100 in two different positions, namely, tilted backwards ( Figure 1 A) and forwards (1B).
  • Figures 2A-2C show the same wheelchair, in perspective view, with the seat part 100 in its lower position ( Figure 2A ), in an optimal intermediate position to be driven ( Figure 2B ) and in an elevated position ( Figure 2C ) (in Figures 2A-2C , some transmission elements have been eliminated to facilitate the view of other elements).
  • the wheelchair comprises a seat part 100 (which, as is conventional, can comprise the seat 101 properly speaking, a backrest 102, armrest 103 and footrest 104) and a lower part 200 which basically corresponds to the base of the chair, i.e., to the general frame and to the elements associated to said frame, including wheels 201, shafts, damping elements, motors, etc.
  • the seat part 100 is coupled to the lower part 200 by means of a coupling mechanism comprising the two arms 1, 1', each of which is articulated to the seat part by means of a pivoting link 1 B, 1 B', and to the lower part by means of other pivoting links located in correspondence with the articulation points 1 A, 1 A' which are basically located diagonally opposite, viewed from above.
  • one of the arms 1 has its articulation point 1 A for articulating to the lower part located in correspondence with a front part of the lower part 200 and in correspondence with the left side (from the point of view of the user) of the lower part 200
  • the other arm 1' has its coupling point 1A' for coupling to the lower part located in correspondence with the rear part of the lower part and in correspondence with the right side of the lower part (viewed from the point of view of the user).
  • this can comprise another two arms opposite one another, placed in the free diagonal in Figures 1A-2C .
  • each arm can pivot around its corresponding rotation shafts associated to said coupling points 1 A, 1 A', such that the opposite ends of the arms 1, 1 , i.e., the ends articulated to the seat part 100, are located at a height depending directly on the angular position of the arm with respect to its rotation shaft or pivoting shaft.
  • the seat part can rise without modifying its tilting, but it is also possible to rotate only one of the arms, or one more than the other, whereby the corresponding variation in the tilting of the seat part 100 is caused, as is made clear in Figures 1A and 1B .
  • the angular positions of the arms 1, 1' with respect to their coupling points 1 A, 1 A' for coupling to the lower part 200 determine both the height position and the tilting of the seat part 100 with respect to the lower part 200.
  • Figure 3 schematically illustrates the seat part 100 with its lower part, which is provided with a connecting rod or bar 100A linked pivotably to the frame of the seat part 100, and with an arm 100A' linked fixedly to the frame.
  • the bar 100A is linked by means of the pivoting link 1 B to one of the arms 1 (see, for example, Figures 1A and 1B and also Figure 8 ), and the arm 100A' is linked by means of the pivoting link 1 B' to the other of the arms 1', as can be seen in, for example, Figures 4A , 4C and 4D (these Figures illustrate, respectively, the seat part at its maximum height, the seat part at its minimum height, the seat part tilted backwards and the seat part tilted forwards).
  • each mobile end (basically, corresponding to the pivoting links 1 B, 1 B') of each "quadrilateral" (system of arms/levers which can be seen in, for example, Figures 5A-5D ) are not entirely vertical, so that the relative distance in the longitudinal direction (i.e., in the forward-moving direction of the chair) is not constant during the entire vertical path.
  • a system capable of absorbing said movements has been introduced.
  • point 1 B linked to the seat in the front lever is linked directly to the seat by means of a link allowing rotation
  • the other linking point 1 B' is linked to the seat by means of a link rod or rocker 100A which is what allows absorbing said difference of movement of the linking points for linking to the seat.
  • another mechanism fulfilling the corresponding function can be used, for example, a linear slide in the plate of the seat and a rotation point in the quadrilateral.
  • the longitudinal distance in the plate of the seat does not vary, whereas by virtue of the rotation of the linking rod 100A, along the vertical path the variation in the longitudinal distance of point 1 B to point 1 B' can be absorbed without introducing deformations in the structure.
  • Figures 5A-5D show the movement mechanism of one of the arms 1 (the other arm can have an identical or similar movement mechanism).
  • arm 1 is associated, by means of a transmission mechanism, to an electric linear actuator 11 linked by means of a pivoting link 12A to an end of a lever 12, at the opposite end of which a pulley 14 is placed which is supported against a lower surface 10 of the arm 1 for part of its angular movement (see Figures 5A-5C ).
  • the lever 12 is coupled, by means of a pivoting link 13A, to a second connecting rod or bar 13 which in turn is articulated with the arm 1 by means of another pivoting link 13B.
  • a spring for example, a gas spring
  • a spring 15 cooperates with the end of the lever 12 in which the pulley 14 is located.
  • Point 1 A corresponds to the coupling point for coupling between the arm 1 and the lower part 200, and point 1 B to the pivoting link between the arm 1 and the seat part 100.
  • the actuator 11 is articulated in this transmission element 16 (alternatively, the actuator can be assembled directly on the lower part).
  • the spring 15 is also coupled pivotably to the transmission element 16.
  • the mechanism For the purpose of optimising the transmission of forces from the actuator 11 to the securing point 1 B of the seat part, as well as minimising the forces to which the actuator is subjected in the drive position (which is seen in Figure 2B ), the mechanism consists of two operational phases, as will be described below.
  • the arm 1 rests (through its lower surface 10) on the pulley 14 bearing the lever or bar 12. It is thus possible to work in the lower part of the path without demanding very strong forces from the actuator 11. Furthermore, there exists a point of the path at which the actuator 11 'does not see' the loads that the transmission system bears. This point is especially suitable for bearing strong forces or impacts, so that it can be selected as the drive position ( Figure 2B , Figure 5C ).
  • Figure 5B shows an intermediate position between the lower position ( Figure 5A ) and the drive position ( Figure 5C ).
  • the movement of the actuator 11 makes the lever 12 rotate, such that the pulley 14 rolls on the lower surface 10 of the arm, transmitting vertical movement to point 1 B where the arm 1 is coupled to the seat part 100.
  • Figure 5C shows the drive position. From this position, the lever 12 makes contact with the bar 13 in correspondence with an abutting surface 13C of said bar 13, forcing the bar 13 to rotate, whereby losing contact between the pulley 14 and the lower surface 10 of the arm 1, such that the rotation of the bar 13 is what finally transmits movement to point 1B, as can be seen in Figure 5D .
  • the lever 12 directly pushes the bar or lever 13.
  • each of the arms 1 is associated to an articulated quadrilateral which moves by means of the electric linear actuator 11, and each of the quadrilaterals consists of the bar 13, the element 16, the arm 1 properly speaking, the lever 12, the pulley 14, the linear actuator 11 and, optionally, the gas spring 15.
  • the main elements of this mechanism are shown in Figure 6 :
  • the linear actuator 11 can float between the lever 12 and the element or arm 16, or between the lever 12 and a fixed point of the lower part 200, whereas the gas spring 15, if it is used, can be placed between the lever 12 and the arm 16.
  • the spring 15 can allow reducing the power (and, therefore, the size) of the actuator 11.
  • Figures 7A and 7B schematically show the general structure of Figure 6 , in two different operational positions.
  • pivoting link means a link between two elements allowing a rotation or pivoting of one of the elements with respect to the other.
  • the invention is not limited to the specific embodiments which have been described but rather it also comprises, for example, the embodiments which can be carried out by a person skilled in the art (for example, with regard to the choice of materials, dimensions, components, configuration, etc.), within the wording the claims.

Claims (13)

  1. Fauteuil roulant, comprenant une portion de siège (100) et une partie inférieure (200) sur laquelle la portion de siège (100) est assemblée, la partie inférieure (200) comprenant un cadre et une pluralité de roues (201) associées au cadre de telle sorte que le fauteuil peut rouler sur une surface, la portion de siège (100) étant couplée à la partie inférieure (200) au moyen d'un mécanisme de couplage (1, 1') configuré de telle sorte que, lorsque la partie inférieure (200) est située sur une surface horizontale,
    - la hauteur de la portion de siège (100) peut être réglée par rapport à la portion inférieure (200), et
    - le basculement de la portion de siège (100) peut être réglé au moins dans un plan vertical qui s'étend dans une direction longitudinale du fauteuil au moyen dudit mécanisme de couplage (1, 1') ;
    caractérisé en ce que
    ledit mécanisme de couplage comprend
    au moins deux bras (1, 1') articulés sur la portion de siège (100) et sur la portion inférieure (200), chacun desdits bras (1, 1') étant articulé sur la portion inférieure (200), au niveau d'un point d'articulation correspondant (1A, 1A'), de manière pivotante par rapport à la portion inférieure (200), de telle sorte que, pour élever la portion de siège (100) jusqu'à une position de hauteur maximale depuis une position de hauteur minimale par rapport à la portion inférieure (200), l'un desdits bras (1) doit pivoter, par rapport à son point d'articulation (1A) et vu d'un côté du fauteuil roulant, dans une première direction (a), et un autre desdits bras (1') doit pivoter, par rapport à son point d'articulation (1A') et vu du même côté du fauteuil roulant, dans une seconde direction opposée à ladite première direction,
    de telle sorte que les positions angulaires des bras (1, 1') par rapport à leur points de couplage (1A, 1A') pour le couplage avec la partie inférieure (200) déterminent à la fois la position en hauteur et le basculement de la portion de siège (200) par rapport à la portion inférieure (200),
    dans lequel chaque bras (1, 1') est articulé sur la portion de siège (100) au moyen d'au moins un lien pivotant (1B, 1B'), et dans lequel au moins un desdits bras (1) est articulé sur ladite portion de siège (100) au moyen dudit lien pivotant (1B) entre ledit bras (1) et une barre (100A), ladite barre (100A) étant couplée à la dite portion de siège (100) au moyen d'un lien pivotant, de telle sorte que ladite barre peut pivoter par rapport à la portion de siège.
  2. Fauteuil roulant selon la revendication 1, dans lequel l'un desdits bras (1) a son point de couplage (1A) pour le couplage à la portion inférieure (200) situé en correspondance avec une portion avant de la portion inférieure et en correspondance avec un premier côté de la portion inférieure, et dans lequel un autre desdits bras (1') a son point de couplage (1A') pour le couplage à la portion inférieure (200) situé en correspondance avec une portion arrière de la portion inférieure et en correspondance avec un second côté de la portion inférieure opposé audite premier côté de la portion inférieure.
  3. Fauteuil roulant selon la revendication 1 ou 2, dans lequel, vu de dessus, lesdits points de couplage (1A, 1A') sont situés dans des zones diagonalement opposées de ladite portion inférieure (200).
  4. Fauteuil roulant selon l'une quelconque des revendications précédentes, dans lequel au moins l'une desdits bras (1') est lié à ladite portion de siège au moyen de son lien pivotant (1B') directement entre ledit bras (1') et un élément (100A') lié rigidement à la portion de siège (100).
  5. Fauteuil roulant selon l'une quelconque des revendications précédentes, dans lequel chaque bras (1, 1') peut être déplacé angulairement au moyen d'un actionneur (11).
  6. Fauteuil roulant selon la revendication 5, dans lequel ledit actionneur (11) est un actionneur linéaire électrique.
  7. Fauteuil roulant selon la revendication 5 ou 6, dans lequel ledit actionneur (11) est couplé au bras correspondant (1) au moyen d'un mécanisme de transmission comprenant un premier élément de transmission (12) couplé au moyen d'un lien pivotant (12A) à une portion mobile de l'actionneur (11), et un second élément de transmission (13) lié, au moyen d'un premier lien pivotant (13A), audit premier élément de transmission (12) et, au moyen d'un second lien pivotant (13B), audit bras (1).
  8. Fauteuil roulant selon la revendication 7, dans lequel ledit premier élément de transmission est muni d'un élément rotatif (14) configuré de telle sorte qu'il est supporté sur une surface inférieure (10) du bras sur au moins une portion du mouvement angulaire du bras par rapport à son point d'articulation (1A) pour articuler la portion inférieure (200).
  9. Fauteuil roulant selon la revendication 8, dans lequel ledit premier lien pivotant (13A) entre le premier élément de transmission (12) et le second élément de transmission (13) est situé dans une zone du premier élément de transmission (12) située entre
    - le lien pivotant (12A) entre le premier élément de transmission (12) et le portion mobile de l'actionneur (11), et
    - l'élément rotatif (14).
  10. Fauteuil roulant selon l'une quelconque des revendications 7 à 9, dans lequel l'actionneur (11) est assemblé de manière pivotante sur une troisième élément de transmission (16) assemblé, à son tour, de manière pivotante.
  11. Fauteuil roulant selon l'une quelconque des revendications 7 à 10, dans lequel le premier élément de transmission (12) et le second élément de transmission (13) sont configurés de telle que, depuis une certaine position angulaire du bras (1) dans un mouvement d'élévation de la portion de siège (100), le premier élément de transmission (12) vient en butée (13C) contre le deuxième élément de transmission, de telle sorte que le pivotement correspondant au lien pivotant (13A) entre le premier élément de transmission (12) et le second élément de transmission (13) est empêché de continuer.
  12. Fauteuil roulant selon l'une quelconque des revendications précédentes, dans lequel un premier desdits bras (1) a sont point d'articulation (1A) situé plus loin en avant dans la portion inférieure que le point d'articulation (1A') d'un second desdits bras (1'), ledit premier bras (1) s'étendant vers l'arrière depuis son point d'articulation (1A) et ledit second bras (1') s'étendant vers l'avant depuis son point d'articulation (1A').
  13. Fauteuil roulant selon l'une quelconque des revendications précédentes, dans lequel lesdits au moins deux bras comprennent quatre bras, qui forment deux paires de bras, chaque paire de bras comprenant deux bras (1, 1') selon ce qui est défini dans l'une quelconque des revendications précédentes.
EP07803634A 2007-07-19 2007-07-19 Chaise roulante Not-in-force EP2050424B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/ES2007/000447 WO2009010600A1 (fr) 2007-07-19 2007-07-19 Chaise roulante

Publications (2)

Publication Number Publication Date
EP2050424A1 EP2050424A1 (fr) 2009-04-22
EP2050424B1 true EP2050424B1 (fr) 2010-09-15

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EP (1) EP2050424B1 (fr)
AT (1) ATE481073T1 (fr)
DE (1) DE602007009259D1 (fr)
ES (1) ES2353027T3 (fr)
HK (1) HK1145433A1 (fr)
WO (1) WO2009010600A1 (fr)

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ATE481073T1 (de) 2010-10-15
WO2009010600A1 (fr) 2009-01-22
DE602007009259D1 (de) 2010-10-28
ES2353027T3 (es) 2011-02-24
EP2050424A1 (fr) 2009-04-22
HK1145433A1 (en) 2011-06-17

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