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
  • A61G5/1081—Parts, details or accessories with shock absorbers or other suspension arrangements between frame and seat

Definitions

• the field of the invention is that of the design and manufacture of equipment for people with reduced mobility.
• the invention relates to a wheelchair of the type comprising at least three wheels, including two side wheels and at least one central, front or rear wheel.
• the armchairs are, for example, equipped with damping systems which make it possible to limit the effect of the roughness of the ground on which the armchairs are moved.
• Damping systems inserted between the frame and the seat are known in particular from patent documents published under the numbers WO 2016/059656, US 6 979 010 or CA 2 307 143.
• the user if he wants to maintain a good position, must counter the bad orientation of the seat. This can then cause discomfort for the user.
• the object of the invention is in particular to overcome the drawbacks of the prior art.
• the aim of the invention is to provide a wheelchair having a seat cushioning system which does not require any effort to adapt to the user.
• the invention also aims to provide such a wheelchair which is suitable both for transporting a person and for practicing sports activities.
• the invention also aims to provide such a wheelchair whose damping system is simple to install and maintain.
• each elastic stud is in the form of a sphere
• the damping means also comprise a central stud located between the three distinct zones, the central stud having a spherical shape.
• the damping means Thanks to the damping means, the comfort of use is increased for the occupant of the wheelchair.
• the damping means ensure the damping and therefore the comfort of the occupant on uneven ground, as well as the freedom of movement of lateral and axial inclination permitted of the seat support with respect to the frame. .
• the three distinct zones remain in contact with each of the frame and the seat support, which guarantees the stability of the seat support.
• the spherical shape allows the elastic studs to be able to damp the movement of the seat regardless of its inclination in relation to the frame. More specifically, the spherical shape guarantees damping even when the seat support is tilted since the spheres work simultaneously in compression and in expansion.
• the central stud forms a pivot point of the seat support on the frame, which promotes the movement of the seat and therefore its inclination to follow the movements of the wheelchair occupant.
• the spherical shape allows the central stud to act as a ball joint to guide and facilitate the inclination of the seat support in relation to the frame.
• the damping means comprise three elastic studs each forming one of the distinct zones.
• the elastic blocks thus deform elastically according to the force exerted on the seat.
• the seat support can move relative to the frame while being cushioned by at least one of the elastic studs, which benefits the comfort of the occupant.
• the elastic studs allow freedom of movement of lateral and axial inclination of the seat support in relation to the frame.
• the damping means also comprise an abutment device for movement of the seat support relative to the chassis.
• This stop device makes it possible to limit the movement of the seat support relative to the frame, in particular their relative spacing.
• Comfort is then improved since the movement of the seat is limited, thus avoiding an excessive undulation effect of the seat.
• the central pad is located at an equal distance from each of the distinct zones.
• the location of the central stud at equal distance from each of the elastic studs makes it possible to avoid unequal wear of the elastic studs, in particular because of unequal solicitation.
• the central stud is located directly above the center of gravity of a seat of the wheelchair.
• At least one of the frame and of the seat support has a plurality of housings in each of which is received one of the elastic studs and/or the central stud.
• the housings ensure correct positioning of the elastic studs and the central stud to promote cushioning of the seat support.
• the seat support moves away from the frame, it creates a space allowing the displacement of the elastic studs and of the central stud.
• the presence of the housings allows that, when the seat support covers a rest position (position in which the studs and the central stud are in contact with both the seat support and the frame), the studs and the central stud are correctly positioned to provide the desired damping.
• the frame comprises:
• the wheelchair also comprises, for each leg, at least one damper secured to one of the leg and to the central plate, the damper producing damping of the inclination of the leg with respect to the central plate.
• FIG. 1 is a perspective view from above of a wheelchair according to the invention, the chair comprising a frame, a movable seat support on the frame, and damping means interposed between the seat support and frame;
• FIG. 2 is an exploded perspective view from above of the damping means of the wheelchair according to the invention.
• FIG. 3 is a schematic sectional representation of the damping means of the wheelchair according to the invention.
• FIG. 4 is a perspective view from above of the frame of the wheelchair according to the invention.
• the wheelchair 100 is of the type comprising:
• each leg 2 having an upper end 21 connected to the frame 1 and
• the 100 chair has:
• the side legs 2L each carry a side wheel 22, and the central leg 2C carries at least one directional wheel 23.
• the central leg 2C carries a hanger 230 provided with a directional wheel 23 at each of its ends.
• the legs 2, and in particular at least the side legs 2L, are mounted on the frame 1 so as to be able to occupy two distinct configurations, namely:
• the frame 1 comprises a central plate 10 on which the lateral legs 2L are each mounted articulated around a joint 11.
• the lateral legs 2L are movably mounted on the central plate 10 around the joint 11 between their rolling configuration and their folded configuration.
• the central leg 2C is also mounted articulated on the central plate 10 via a central articulation 12.
• the seat A incorporates a seat support 3 by which the seat A is secured to the frame 1 .
• the seat support 3 is attached to the seat A.
• the wheelchair 100 includes 4 damping means.
• the damping means 4 are inserted between the seat A and the frame 1.
• damping means 4 are inserted between the seat support 3 and the central plate 10.
• damping means 4 are divided into three distinct zones.
• the three distinct zones are arranged to form a support-plan type connection between the seat support 3 and the frame 1 .
• the damping means comprise three elastic studs 41 each forming one of the distinct zones.
• each elastic stud 41 is in the form of a sphere.
• the damping means 4 also include a central stud 42 located between the three distinct zones.
• the central stud 42 has a spherical shape.
• the central stud 42 acts as a ball joint making it easier to move the seat support 3 on the central plate 10 of the chassis 1.
• the seat A can thus follow the movement of the occupant of the wheelchair 100 on uneven ground. Furthermore, the elastic studs 41 of the damping system 4 softens the movements of the seat A, which increases comfort for the occupant.
• the central stud 42 is located at an equal distance from each of the distinct zones.
• the central block 42 is located directly above the center of gravity of the seat A or the center of gravity of the seat and its occupant.
• the center of gravity of the assembly comprising the seat A and the user, acts orthogonally on the damping means and the degrees of freedom of the seat pivots are authorized and/or braked in an optimal manner.
• the elastic studs 41 and/or the central stud 42 can be solid, or have a cavity whose air pressure ensures the rigidity of the damping.
• the air pressure conferred by the volume of the cavity can therefore be adjusted according to the desired damping flexibility.
• the damping means 4 also comprise a stop device 5 for displacement of the seat support 3 relative to the frame 1.
• the stop system 5 comprises at least one screw 51 having a head 52, as well as a nut 53.
• the screw 51 is mounted through one of the elastic studs 41 and the head 52 is housed in a cavity 31 of the seat support 3.
• the screw 51 thus passes through the seat support 3, the elastic stud 41 and the central Latin 10.
• the nut 53 is housed in a recess 101 made in the central plate 10.
• the recess 101 has a rounded portion allowing movement of the nut 53 depending on the position taken by the seat support 3 with respect to the central plate 10.
• the screw 51 and the nut 53 can move in the recess 101, which allows the elastic stud 41 to be crushed independently of the other elastic studs 41, thus promoting comfort for the occupant.
• the abutment device 5 can advantageously comprise a screw 51 and a nut 53 for each of the elastic studs 41 .
• the abutment device 5 may comprise at least one strap instead of the screws 51.
• the stop device 5 advantageously comprises three straps regularly spaced from each other on the periphery of the seat support 3.
• Each strap is then fixed to the seat support 3 by one of its ends and to the central plate 10 by the other of its ends.
• At least one of the frame 1 and the seat support 3 has a plurality of housings 6 in each of which is received one of the elastic studs 41 and / or the central stud 42.
• the housings 6 make it possible to house the elastic studs 41 and/or the central stud 42 in order to promote the operation of the damping means 4.

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)
• Chair Legs, Seat Parts, And Backrests (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=75108392

Family Applications (1)

Country Status (4)

Family Cites Families (6)

• 2020
  • 2020-11-10 FR FR2011569A patent/FR3115980B1/fr active Active
• 2021
  • 2021-11-08 CN CN202180090062.4A patent/CN116744883A/zh active Pending
  • 2021-11-08 WO PCT/EP2021/080866 patent/WO2022101114A1/fr active Application Filing
  • 2021-11-08 EP EP21799305.4A patent/EP4243753A1/de active Pending

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