EP3773400B1 - Wheelchair - Google Patents

Wheelchair Download PDF

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Publication number
EP3773400B1
EP3773400B1 EP19719575.3A EP19719575A EP3773400B1 EP 3773400 B1 EP3773400 B1 EP 3773400B1 EP 19719575 A EP19719575 A EP 19719575A EP 3773400 B1 EP3773400 B1 EP 3773400B1
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EP
European Patent Office
Prior art keywords
hand
hub
relation
side shaft
rim
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Application number
EP19719575.3A
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German (de)
French (fr)
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EP3773400A1 (en
EP3773400C0 (en
Inventor
Colin GALLOIS
Lancelot DURAND
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Eppur
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Eppur
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Publication of EP3773400C0 publication Critical patent/EP3773400C0/en
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    • 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
    • A61G5/02—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs propelled by the patient or disabled person
    • A61G5/028—Special adaptations or provisions on hand rim, e.g. for facilitating gripping
    • 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
    • A61G5/02—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs propelled by the patient or disabled person
    • 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
    • A61G5/1005—Wheelchairs having brakes
    • A61G5/1008—Wheelchairs having brakes for gradually slowing down the wheelchair
    • 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
    • A61G5/1005—Wheelchairs having brakes
    • A61G5/1021—Wheelchairs having brakes engaging specific brake elements
    • A61G5/1027—Hub elements, e.g. drums
    • 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
    • A61G5/1005—Wheelchairs having brakes
    • A61G5/1035—Wheelchairs having brakes manipulated by wheelchair user
    • 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
    • A61G5/1083—Quickly-removable wheels

Definitions

  • the present invention relates to the field of non-motorized wheelchairs for the elderly or disabled people.
  • the chairs generally have two driving side wheels driven by a handrail allowing the user to turn the wheels, possibly at different speeds to steer the chair, and also to brake the chair.
  • This document mainly concerns a wheel for a coaster type cycle with a (single) wheel for a cycle with a fork for a single rear wheel.
  • a “car for disabled people” designated, in 1929 (date of filing of this patent), a tricycle with a single driving wheel at the rear, driven like a bicycle wheel.
  • a “car for disabled people” is not comparable to a wheelchair.
  • a cylindrical claw rides up along the claw of a cylindrical bolt to provide engagement between the ridges of the claws. Additionally, a pin engages a hole in the wheel hub, so the wheel hub is completely separated of a hub shaft and the wheel hub can turn freely again.
  • This patent describes a solution requiring an actuation lever and does not ensure braking, forward drive and reverse drive by action on the same organ, namely the handrail of each of the driving wheels.
  • the patent US5027930 describes a coaster brake coupled directly to a drive shaft.
  • a threaded shaft is integrated into the drive shaft.
  • a clutch cone having an internal thread moves in axial directions as it threads in or out of the driver, depending on the rotation of the driver.
  • a brake cone is provided and has a smooth axial bore through which the drive shaft rotates. The axial movement of the clutch cone towards the brake cone has the effect of forcing the brake shoes against the inner wall of the hub.
  • a spring is provided to facilitate the action of the thread between the clutch cone and the driver.
  • This patent concerns a bicycle with a single driving wheel, without any handrail for the drive.
  • the braking means is in particular ensured by bringing into contact two complementary surfaces in relative movement, for example the conical surface of an axially movable element with a complementary conical surface inside the hub.
  • said means of connecting the lateral axes with the frame are constituted by free roller wheels.
  • said means of connecting the lateral axes with the frame are constituted by ratchet freewheels.
  • connection zone of the frame is located between said means of connecting a lateral axis on the one hand, and the wheel and the handrail on the other hand.
  • said means for connecting the lateral axis with the frame comprises a means for quickly attaching said lateral axis.
  • the two wheels in the kit are of different natures, with regard to the direction of locking of the hub.
  • the armchair generally consists of a frame (1) supporting a seat (2) and a backrest (3).
  • the chair has a right wheel (10) and a left wheel (20), relative to the normal direction of movement of the chair.
  • Each wheel (10, 20) can be operated by a handrail respectively (11, 21).
  • the coupling between the left wheel (20) and the associated left handrail (21) is ensured by a left hub (22) whose operation will be described below. It is the same for the coupling of the right wheel (10) with the right handrail (12), ensured by a right hub.
  • a shaft (23) passes through the hub (22) of the wheel (20) associated with the handrail (21), as well as the flange (25) secured to the frame (24).
  • the inner end of the shaft (23) is held by a flange (25) containing a roller freewheel, secured to said flange (25).
  • FIG. 2 represents a detailed view of the wheel according to a first alternative embodiment where the flange containing a roller freewheel is positioned between the wheel and the chair frame.
  • the flange (15) containing a free wheel (16) with rollers (17)) is fixed to the frame (14) via a rod extending axially from the surface opposite the hub.
  • This rod is screwed to the frame of the chair. It can also be attached using a quick release system.
  • a quick attachment system is for example constituted by a rod extending the exterior face of the flange and passing through the frame of the chair. The rod can be retained by a lock actuated by a spring or any other known means.
  • This flange (15) contains a free wheel (16) with rollers (17) allowing the rotation of the shaft (13).
  • the flange (25) contains a free roller wheel allowing the rotation of the shaft (23), integral with the wheel, in the clockwise direction (antitrigonometric direction), but blocking the rotation in the counterclockwise direction, and vice versa for the right wheel.
  • the free wheel (16) has for this purpose, in a known manner, inclined ramps.
  • the rollers (17) engage between the inclined ramps and the cylindrical interior surface of the flange (15), aided by a return spring acting on a roller cage.
  • the friction between rollers (17) and the free wheel (16) with inclined ramps on the one hand, between rollers (17) and the flange (15) on the other hand, as well as the geometry of the parts, creates the arc -butting providing braking by adhesion.
  • the shaft (13) turns counterclockwise relative to the flange, the rollers disengage and allow free rotation relative to the flange (15), for the right wheel, and clockwise for the left wheel.
  • the handrail (11) drives the wheel (40) provided with a thread (43).
  • the inner end of the wheel (40) has a thread (43) driving a movable assembly (44) having a ramp (45).
  • the mobile assembly (44) When the mobile assembly (44) is moved axially inwards, it ensures the compression of a braking ring (46), the opposite end of which rests on a cone (47) and the outer face of which comes radially exert progressive friction on the hub (12) of the wheel (10).
  • the characteristics of the hub in particular the translational travel of the movable element between the two ends, the length of the movable element, and the pitch of the thread are determined so that the movement from one end to the other is obtained by a relative angular travel between the handrail and the associated wheel of approximately 1°, and preferably between 0.1° and 10°, and more preferably between 0.1° and 2°.
  • a return spring pushes back in the absence of input from the handrail by the user, the latter in its forward position.
  • This spring is for example arranged in the hub to push the movable assembly outwards, in the opposite direction of the chassis.
  • the mobile assembly (44) is pushed back to rest in a position where the convex conical outer end (41) comes into contact with the concave bearing surface (42) of the hub (12), under the action of 'a spring for example.
  • FIG. 3 represents a detailed view of the wheel according to a second alternative embodiment where the flange containing a free wheel with rollers is positioned inside the chair.
  • the wheel comprises a flange (15) coaxial with the hub (12).
  • the flange (15) is fixed to the interior surface of the frame (14) of the chair, by welding or by bolts or rivets.
  • This flange (15) contains a free wheel (16) with rollers (17) allowing the rotation of the shaft (13), integral with the free wheel (16), in the anti-clockwise direction (trigonometric direction), but blocking clockwise rotation for the right wheel.
  • the flange (25) contains a free roller wheel allowing the rotation of the shaft (23), integral with the wheel, in the clockwise direction (antitrigonometric direction), but blocking the rotation in the counterclockwise direction to the right wheel.
  • the free wheel (16) has for this purpose, in a known manner, inclined ramps.
  • the rollers (17) engage between the inclined ramps and the cylindrical interior surface of the flange (15), aided by a return spring acting on a roller cage.
  • the friction between rollers (17) and the free wheel (16) with inclined ramps on the one hand, between rollers (17) and the flange (15) on the other hand, as well as the geometry of the parts, creates the arc -butting providing braking by adhesion.
  • the shaft (13) turns counterclockwise relative to the flange, the rollers disengage and allow free rotation relative to the flange (15), for the right wheel, and clockwise for the left wheel.
  • the handrail (11) drives the shaft (40) provided with a thread (43).
  • the inner end of the wheel (40) has a thread (43) driving a movable assembly (44) having a ramp (45).
  • the mobile assembly (44) When the mobile assembly (44) is moved axially inwards, it ensures the compression of a braking ring (46), the opposite end of which rests on a cone (47) and the outer face of which radially comes to exert progressive friction on the hub (12) of the wheel (10).
  • FIG 4 represents a third alternative embodiment.
  • the wheel differs from the first variant in that the flange (15) is fixed to the outer ring of a free wheel (16) with roller (17).
  • the inner ring of the ball freewheel is fixed to the side axle (13).
  • FIG. 5 represents another variant of the system having the advantage of better compactness.
  • the compactness guarantees, among other things, the user's passage through doors.
  • the kinematics of the system are identical to the variants described previously.
  • the difference in this variant lies in the fact that said connecting means (15) of the lateral axes with the frame are located in an interior recess of the plug (47) closing the hub.
  • connection of the lateral axis (13) to the frame is always carried out through a connecting means blocking in the clockwise direction and free to rotate in the counter-clockwise direction.
  • the outer ring of the free wheel (16) with rollers (17) is fixed to an inner face of the plug (47) itself secured to the lateral axis (13).
  • the inner ring of said free ball wheel is fixed to the frame, through a second lateral axis (15)
  • the invention also relates to a pair of wheels associated with the aforementioned mechanisms, to allow the transformation of an existing wheelchair.
  • a particular variation illustrated by the figures 6 and 7 concerns the fixing of the wheels to the frame of the chair by a quick attach system respectively when the wheel is separated from the chair and when the wheel is fixed on the chair.
  • Such a system is constituted by a rod formed of two coaxial and contiguous sections (100 and 120), the front front end of the section (100) coming into contact with the rear front end of the section (120), the two sections ( 100, 120) being free in relative rotation.
  • the rod formed in the example described by the two sections (100, 120) is crossed by a coaxial needle (110).
  • This rod can alternatively be made in a single section passing through the entire means of the wheel.
  • the first section (100) passes through the means and the hollow axis (13).
  • the second section (120) passes through the axis of the roller freewheel (16).
  • the wall of the front end of the section (120) has slots for the passage of balls (104) movable radially between a position where they form a protuberance relative to the exterior surface of the section (120), thus increasing the cross section , and a centripetal position where they disappear.
  • the section of the front part of the section (120) allows engagement in a housing of the chair frame with a section complementary to the section of the section (120), when the balls are in the centripetal position, and when the balls are pushed outwards, it ensures the blocking of the section (120) in the frame of the chair.
  • a needle (110) passes through the two sections (100, 120) and has at its front end an annular groove extended at the front by a frustoconical end part allowing the balls to be pushed back when the needle (110) is engaged. in the inner channel of the rod (100, 120).
  • the annular groove has a radius of curvature complementary to the radius of the balls (104). When this groove is pushed back to the level of the balls, they can move in a centripetal position. At rest, a spring (102) pushes the needle (110) backwards, and the annular groove moves so that the balls are expelled in a centrifugal position by the tubular section of the needle (110).
  • the quick attachment system is provided with an anti-rotation means, consisting of a tab (150) whose end is intended to be fixed on a fixed part of the wheelchair frame.
  • the end of this tab (150) has a slot for engaging a lug (151) extending the surface of the chair frame.
  • this anti-rotation means is constituted by a flat section of complementary section with that of the front end of the section (120).

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Handcart (AREA)
  • Braking Arrangements (AREA)
  • Automatic Cycles, And Cycles In General (AREA)

Description

Domaine de l'inventionField of the invention

La présente invention concerne le domaine des fauteuils roulants non motorisés pour personnes âgées ou personnes handicapées.The present invention relates to the field of non-motorized wheelchairs for the elderly or disabled people.

Ces fauteuils doivent être légers, très robustes et permettre un déplacement manuel facile.These chairs must be light, very robust and allow easy manual movement.

A cet effet, les fauteuils comportent généralement deux roues latérales motrices entraînées par une main courante permettant à l'utilisateur de faire tourner les roues, éventuellement à des vitesses différenciées pour diriger le fauteuil, et également de freiner le fauteuil.For this purpose, the chairs generally have two driving side wheels driven by a handrail allowing the user to turn the wheels, possibly at different speeds to steer the chair, and also to brake the chair.

Etat de la techniqueState of the art

On connaît dans l'état de la technique le brevet français FR685706 concernant un moyeu de frein à roue libre et à pédale arrière pour tricycles, voitures pour invalides, etc., adapté pour permettre à la roue de conduire en sens inverse, en utilisant un mécanisme à cliquet interposé entre le cycle, etc. une fourche et un élément portant la bande de frein, etc., et adaptés pour empêcher la rotation de cet élément dans le sens avant, mais pour permettre sa rotation dans le sens arrière, avec un frottement suffisant pour permettre le fonctionnement du frein. Le plateau à chaîne d'entraînement est monté sur un manchon comportant un filetage de vis s'engageant dans un élément qui entraîne le moyeu dans la direction avant (flèche F) par l'intermédiaire d'un mécanisme à cliquet et à cliquet permettant une action de roue libre. Lors du pédalage arrière (flèche B), l'organe est traversé par le filetage pour engager sa partie conique d'embrayage dans une cuvette qui, ensuite, fait basculer un levier autour de son pivot sur un plateau, élargir une bande au contact d'un tambour de frein.We know in the state of the art the French patent FR685706 relating to a freewheel and rear pedal brake hub for tricycles, invalid cars, etc., adapted to enable the wheel to drive in reverse, using a ratchet mechanism interposed between the cycle, etc. a fork and an element carrying the brake band, etc., and adapted to prevent the rotation of this element in the forward direction, but to allow its rotation in the rear direction, with sufficient friction to allow the operation of the brake. The drive chain plate is mounted on a sleeve having a screw thread engaging a member which drives the hub in the forward direction (arrow F) via a ratchet and ratchet mechanism allowing for freewheel action. When pedaling backwards (arrow B), the organ is crossed by the thread to engage its conical clutch part in a cup which, then, tilts a lever around its pivot on a plate, widening a band on contact with 'a brake drum.

Ce document concerne principalement une roue pour cycle de type à rétropédalage avec une roue (unique) pour un cycle avec une fourche pour une seule roue arrière.This document mainly concerns a wheel for a coaster type cycle with a (single) wheel for a cycle with a fork for a single rear wheel.

Une « voiture pour mutilés » désignait, en 1929 (date de dépôt de ce brevet), un tricycle avec une seule roue motrice à l'arrière, entraînée à la manière d'une roue de bicyclette.A “car for disabled people” designated, in 1929 (date of filing of this patent), a tricycle with a single driving wheel at the rear, driven like a bicycle wheel.

Ce document n'évoque jamais l'actionnement de la roue par une main courante (on ne voit pas trop où elle serait fixée sur une « voiture de mutilés »), ni l'utilisation de deux roues (si elles n'étaient pas jumelées mais disposées de part et d'autre d'un engin, celui-ci ne pourrait pas avancer), et encore moins l'utilisation de deux roues de structures différentes.This document never mentions the actuation of the wheel by a handrail (we do not really see where it would be fixed on a “car for disabled people”), nor the use of two wheels (if they were not twinned). but placed on either side of a machine, it could not move forward), and even less the use of two wheels of different structures.

Une « voiture pour mutilés » n'est pas assimilable à un fauteuil roulant.A “car for disabled people” is not comparable to a wheelchair.

On connaît aussi le brevet japonais JPH06 165799 décrivant un fauteuil roulant qui s'arrête de manière positive dans une position où il est orienté dans une direction de progression sans le freiner à mi-pente, en permettant au fauteuil roulant d'avoir une fonction de butée arrière conçue de manière simple et pouvant être commutée légèrement. Une poignée de commutation est tournée dans le sens antihoraire lorsqu'un fauteuil roulant est roulé à l'extérieur ou est sur le point de gravir une pente ascendante. Lorsque le fauteuil roulant est situé dans une pente et que son utilisateur garde sa main loin de la manette, un embrayage unidirectionnel avec roulement est fermement engagé, tandis qu'un moyeu de roue tend à tourner dans le sens des aiguilles d'une montre. La rotation se produit c'est-à-dire que le moyeu de roue peut tourner dans le sens antihoraire, mais ne peut pas tourner dans le sens horaire, empêchant le fauteuil roulant de reculer. Si la poignée de commutation est tournée dans le sens des aiguilles d'une montre, une griffe cylindrique monte le long de la griffe d'un boulon cylindrique pour permettre un engagement entre les crêtes des griffes. En outre, une goupille s'engage dans un trou du moyeu de roue, de sorte que le moyeu de roue est complètement séparé d'un arbre de moyeu et que le moyeu de roue peut à nouveau tourner librement.We also know the Japanese patent JPH06 165799 describing a wheelchair which stops positively in a position where it is oriented in a direction of progression without braking it mid-incline, allowing the wheelchair to have a back stop function which is simply designed and can be switched slightly. A switch handle is turned counterclockwise when a wheelchair is rolled outdoors or is about to climb an uphill grade. When the wheelchair is located on an incline and the user keeps their hand away from the joystick, a one-way clutch with bearing is firmly engaged, while a wheel hub tends to rotate clockwise. Rotation occurs i.e. the wheel hub can turn counterclockwise, but cannot turn clockwise, preventing the wheelchair from moving backwards. If the switch handle is turned clockwise, a cylindrical claw rides up along the claw of a cylindrical bolt to provide engagement between the ridges of the claws. Additionally, a pin engages a hole in the wheel hub, so the wheel hub is completely separated of a hub shaft and the wheel hub can turn freely again.

Ce brevet décrit une solution nécessitant une manette d'actionnement et ne permet pas d'assurer le freinage, l'entrainement en marche avant et l'entraînement en marche arrière par une action sur le même organe, à savoir la main courante de chacune des roues motrices.This patent describes a solution requiring an actuation lever and does not ensure braking, forward drive and reverse drive by action on the same organ, namely the handrail of each of the driving wheels.

Le brevet US5027930 décrit un frein à rétropédalage couplé directement à un arbre d'entraînement. Un arbre fileté est intégré à l'arbre d'entraînement. Un cône d'embrayage ayant un filetage interne se déplace dans les directions axiales lorsqu'il s'enfile dans ou hors du conducteur, en fonction de la rotation du conducteur. Un cône de frein est prévu et comporte un alésage axial lisse à travers lequel tourne l'arbre d'entraînement. Le mouvement axial du cône d'embrayage vers le cône de frein a pour effet de forcer les segments de frein contre la paroi interne du moyeu. Un ressort est prévu pour faciliter l'action du filetage entre le cône d'embrayage et le conducteur.The patent US5027930 describes a coaster brake coupled directly to a drive shaft. A threaded shaft is integrated into the drive shaft. A clutch cone having an internal thread moves in axial directions as it threads in or out of the driver, depending on the rotation of the driver. A brake cone is provided and has a smooth axial bore through which the drive shaft rotates. The axial movement of the clutch cone towards the brake cone has the effect of forcing the brake shoes against the inner wall of the hub. A spring is provided to facilitate the action of the thread between the clutch cone and the driver.

Ce brevet concerne une bicyclette comportant une seule roue motrice, sans aucune main courante pour l'entraînant.This patent concerns a bicycle with a single driving wheel, without any handrail for the drive.

Inconvénient de l'art antérieurDisadvantage of the prior art

Les solutions de l'art antérieur les plus proches de l'invention concernent les fauteuils roulants non motorisés à entraînement par mains courantes sur lesquelles l'utilisateur exerce des poussées répétées. Pour freiner, l'utilisateur bloque la main courante avec la paume de sa main. Lorsque le couple de freinage est important, il est usuel que l'utilisateur procède par des petites saccades pour ne pas provoquer de brulure de la paume de la main.The solutions of the prior art closest to the invention concern non-motorized wheelchairs driven by handrails on which the user exerts repeated pushes. To brake, the user blocks the handrail with the palm of their hand. When the braking torque is high, it is usual for the user to use small jerks to avoid burning the palm of the hand.

Solution apportée par l'inventionSolution provided by the invention

Afin de remédier à cet inconvénient, l'invention concerne selon son acception la plus générale un fauteuil roulant comportant un cadre et deux roues principales motrices (au sens d'entraînement humain) accouplées chacune à une main courante pour l'actionnement desdites roues dans les deux sens de rotation et pour le freinage,
caractérisé en ce que ledit cadre est équipé :

  • du coté droit par rapport à la direction de déplacement normale
    • ∘ d'un moyen de liaison d'un axe latéral bloquant dans le sens horaire et libre en rotation dans le sens anti-horaire
    • ∘ la main courante droite étant montée libre en rotation par rapport audit axe latéral, sans liberté de translation axiale
    • ∘ la roue droite étant munie d'un moyeu relié à ladite main courante par un moyen de liaison bloquant dans le sens horaire
    • ∘ ledit moyeu comportant un moyen de freinage de la rotation dudit moyeu par rapport audit axe latéral, actionné par le déplacement anti-horaire de ladite main courante par rapport audit axe latéral
  • du coté gauche par rapport à la direction de déplacement normale
    • ∘ d'un moyen de liaison d'un axe latéral bloquant dans le sens anti-horaire et libre en rotation dans le sens horaire
    • ∘ la main courante gauche étant montée libre en rotation par rapport audit axe latéral, sans liberté de translation axiale
    • ∘ la roue gauche étant munie d'un moyeu relié à ladite main courant par un moyen de liaison bloquant dans le sens antihoraire
    • ∘ ledit moyeu comportant un moyen de freinage de la rotation dudit moyeu par rapport audit axe latéral, actionné par le déplacement horaire de ladite main courante par rapport axe latéral.
In order to remedy this drawback, the invention relates in its most general sense to a wheelchair comprising a frame and two main driving wheels (in the sense of human drive) each coupled to a handrail for actuating said wheels in both directions of rotation and for braking,
characterized in that said frame is equipped:
  • on the right side relative to the normal direction of movement
    • ∘ a means of connecting a lateral axis locking in the clockwise direction and rotating freely in the counterclockwise direction
    • ∘ the right handrail being mounted free to rotate relative to said lateral axis, without freedom of axial translation
    • ∘ the right wheel being provided with a hub connected to said handrail by a locking connection means in the clockwise direction
    • ∘ said hub comprising means for braking the rotation of said hub relative to said lateral axis, actuated by the anti-clockwise movement of said handrail relative to said lateral axis
  • on the left side relative to the normal direction of movement
    • ∘ a means of connecting a lateral axis blocking in the counterclockwise direction and free to rotate in the clockwise direction
    • ∘ the left handrail being mounted free to rotate relative to said lateral axis, without freedom of axial translation
    • ∘ the left wheel being provided with a hub connected to said handrail by a connecting means blocking in the counterclockwise direction
    • ∘ said hub comprising means for braking the rotation of said hub relative to said lateral axis, actuated by the clockwise movement of said handrail relative to the lateral axis.

Le sens « horaire » ou « anti-horaire » s'entend lorsqu'on regarde la roue depuis l'extérieur du fauteuil.The “clockwise” or “counterclockwise” direction is understood when looking at the wheel from outside the chair.

Le moyen de freinage est notamment assuré par la mise en contact de deux surfaces complémentaires en mouvement relatif, par exemple la surface conique d'un équipage mobile axialement avec une surface conique complémentaire à l'intérieur du moyeu.The braking means is in particular ensured by bringing into contact two complementary surfaces in relative movement, for example the conical surface of an axially movable element with a complementary conical surface inside the hub.

Selon une variante, lesdits moyens de liaison des axes latéraux avec le cadre sont constitués par des roues libres à rouleaux.According to a variant, said means of connecting the lateral axes with the frame are constituted by free roller wheels.

Selon une autre variante, lesdits moyens de liaison des axes latéraux avec le cadre sont constitués par des roues libres à cliquet.According to another variant, said means of connecting the lateral axes with the frame are constituted by ratchet freewheels.

Selon une autre variante éventuelle, la zone de liaison du cadre est située entre ledit moyen de liaison d'un axe latéral d'une part, et la roue et la main courante d'autre part.According to another possible variant, the connection zone of the frame is located between said means of connecting a lateral axis on the one hand, and the wheel and the handrail on the other hand.

Selon un mode de réalisation particulier, ledit moyen de liaison de l'axe latéral avec le cadre comporte un moyen d'attache rapide dudit axe latéral.According to a particular embodiment, said means for connecting the lateral axis with the frame comprises a means for quickly attaching said lateral axis.

L'invention concerne aussi un kit comprenant un couple de roues pour fauteuil roulant constitué par un ensemble destiné au côté droit du fauteuil par rapport à la direction de déplacement normale, formé par

  • ∘ une main courante droite montée libre en rotation par rapport à un axe latéral, sans liberté de translation axiale
  • ∘ la roue droite étant munie d'un moyeu relié à ladite main courante par un moyen de liaison bloquant dans le sens horaire
  • ∘ ledit moyeu comportant un moyen de freinage de la rotation dudit moyeu par rapport audit axe latéral, actionné par le déplacement anti-horaire de ladite main courante par rapport audit axe latéral
et par un ensemble destiné au côté gauche du fauteuil par rapport à la direction de déplacement normale, formé par
  • ∘ la main courante gauche montée libre en rotation par rapport audit axe latéral, sans liberté de translation axiale
  • ∘ la roue gauche étant munie d'un moyeu relié à ladite main courante par un moyen de liaison bloquant dans le sens anti-horaire
  • ∘ ledit moyeu comportant un moyen de freinage de la rotation dudit moyeu par rapport audit axe latéral, actionné par le déplacement horaire de ladite main courante par rapport audit axe latéral.
The invention also relates to a kit comprising a pair of wheels for a wheelchair constituted by an assembly intended for the right side of the wheelchair with respect to the normal direction of movement, formed by
  • ∘ a right handrail mounted free to rotate relative to a lateral axis, without freedom of axial translation
  • ∘ the right wheel being provided with a hub connected to said handrail by a locking connection means in the clockwise direction
  • ∘ said hub comprising means for braking the rotation of said hub relative to said lateral axis, actuated by the anti-clockwise movement of said handrail relative to said lateral axis
and by an assembly intended for the left side of the chair relative to the normal direction of movement, formed by
  • ∘ the left handrail mounted free to rotate relative to said lateral axis, without freedom of axial translation
  • ∘ the left wheel being provided with a hub connected to said handrail by a connecting means blocking in the anti-clockwise direction
  • ∘ said hub comprising means for braking the rotation of said hub relative to said lateral axis, actuated by the clockwise movement of said handrail relative to said lateral axis.

Les deux roues du kit sont de natures différentes, en ce qui concerne le sens de blocage du moyeu.The two wheels in the kit are of different natures, with regard to the direction of locking of the hub.

Description détaillée d'un exemple non limitatif de l'inventionDetailed description of a non-limiting example of the invention

La présente invention sera mieux comprise à la lecture de la description détaillée d'un exemple non limitatif de l'invention qui suit, se référant aux dessins annexés où :

  • la figure 1 représente une vue éclatée d'un fauteuil selon l'invention
  • la figure 2 représente une vue en coupe axiale de la roue selon un premier mode de réalisation où la flasque contenant une roue libre à rouleaux est positionnée entre l'arbre principal et le cadre
  • la figure 3 représente une vue en coupe axiale de la roue selon un deuxième mode de réalisation où une flasque contenant une roue libre à rouleaux est positionnée à l'intérieur du fauteuil
  • la figure 4 représente une vue en coupe axiale de la roue selon un troisième mode de réalisation correspondant à une réalisation plus compacte de la première variante
  • la figure 5 représente une vue en coupe axiale de la roue selon un quatrième mode de réalisation où la flasque contenant une roue libre à rouleaux est logée dans le moyeu de la roue
  • les figures 6 et 7 représentent une vue en coupe axiale de la roue selon ledit quatrième mode de réalisation, avec un système d'attache rapide, respectivement en position dégagée et en position engagée
  • la figure 8 représente une vue en coupe axiale de et de face de la roue avec une variante dudit système d'attache rapide.
The present invention will be better understood on reading the detailed description of a non-limiting example of the invention which follows, referring to the appended drawings where:
  • there figure 1 represents an exploded view of an armchair according to the invention
  • there figure 2 represents an axial sectional view of the wheel according to a first embodiment where the flange containing a roller freewheel is positioned between the main shaft and the frame
  • there Figure 3 represents an axial sectional view of the wheel according to a second embodiment where a flange containing a free roller wheel is positioned inside the chair
  • there Figure 4 represents an axial sectional view of the wheel according to a third embodiment corresponding to a more compact embodiment of the first variant
  • there Figure 5 represents an axial sectional view of the wheel according to a fourth embodiment where the flange containing a roller freewheel is housed in the hub of the wheel
  • THE figures 6 and 7 represent an axial sectional view of the wheel according to said fourth embodiment, with a quick attach system, respectively in the disengaged position and in the engaged position
  • there figure 8 represents an axial sectional view of and from the front of the wheel with a variant of said quick release system.

Présentation générale du fauteuilGeneral presentation of the chair

Le fauteuil est constitué de façon générale par un cadre (1) supportant une assise (2) et un dossier (3).The armchair generally consists of a frame (1) supporting a seat (2) and a backrest (3).

Le fauteuil comporte une roue droite (10) et une roue gauche (20), par rapport au sens de déplacement normal du fauteuil.The chair has a right wheel (10) and a left wheel (20), relative to the normal direction of movement of the chair.

Chaque roue (10, 20) peut être actionnée par une main courante respectivement (11, 21). Le couplage entre la roue gauche (20) et la main courante gauche (21) associée est assuré par un moyeu gauche (22) dont le fonctionnement sera décrit dans la suite. Il en est de même pour l'accouplement de la roue droite (10) avec la main courante droite (12), assuré par un moyeu droit.Each wheel (10, 20) can be operated by a handrail respectively (11, 21). The coupling between the left wheel (20) and the associated left handrail (21) is ensured by a left hub (22) whose operation will be described below. It is the same for the coupling of the right wheel (10) with the right handrail (12), ensured by a right hub.

Un arbre (23) traverse le moyeu (22) de la roue (20) associée à la main courante (21), ainsi que la flasque (25) solidaire du bâti (24). L'extrémité intérieure de l'arbre (23) est maintenue par une flasque (25) contenant une roue libre à rouleau, solidaire de ladite flasque (25).A shaft (23) passes through the hub (22) of the wheel (20) associated with the handrail (21), as well as the flange (25) secured to the frame (24). The inner end of the shaft (23) is held by a flange (25) containing a roller freewheel, secured to said flange (25).

Description détaillée de la roue droite selon une première variante de réalisationDetailed description of the right wheel according to a first alternative embodiment

La figure 2 représente une vue en détail de la roue selon une première variante de réalisation où la flasque contenant une roue libre à rouleaux est positionnée entre la roue et le cadre du fauteuil.There figure 2 represents a detailed view of the wheel according to a first alternative embodiment where the flange containing a roller freewheel is positioned between the wheel and the chair frame.

La flasque (15) contenant une roue libre (16) à rouleaux (17)) est fixée sur le cadre (14) par l'intermédiaire d'une tige prolongeant axialement la surface opposée au moyeu. Cette tige est vissée au cadre du fauteuil. Elle peut aussi être fixée par un système d'attache rapide. Un tel système d'attache rapide est par exemple constitué par une tige prolongeant la face extérieure de la flasque et traversant le cadre du fauteuil. La tige peut être retenue par un verrou actionné par un ressort ou tout autre moyen connu.The flange (15) containing a free wheel (16) with rollers (17)) is fixed to the frame (14) via a rod extending axially from the surface opposite the hub. This rod is screwed to the frame of the chair. It can also be attached using a quick release system. Such a quick attachment system is for example constituted by a rod extending the exterior face of the flange and passing through the frame of the chair. The rod can be retained by a lock actuated by a spring or any other known means.

Cette flasque (15) contient une roue libre (16) à rouleaux (17) autorisant la rotation de l'arbre (13).This flange (15) contains a free wheel (16) with rollers (17) allowing the rotation of the shaft (13).

Pour la roue gauche, la flasque (25) contient une roue libre à rouleaux autorisant la rotation de l'arbre (23), solidaire de la roue, dans le sens horaire (sens antitrigonométrique), mais bloquant la rotation dans le sens antihoraire, et inversement pour la roue droite.For the left wheel, the flange (25) contains a free roller wheel allowing the rotation of the shaft (23), integral with the wheel, in the clockwise direction (antitrigonometric direction), but blocking the rotation in the counterclockwise direction, and vice versa for the right wheel.

La roue libre (16) présente à cet effet, de manière connue, des rampes inclinées. Les rouleaux (17) s'engagent entre les rampes inclinées et la surface intérieure cylindrique de la flasque (15), aidés par un ressort de rappel agissant sur une cage à rouleaux. Le frottement entre rouleaux (17) et la roue libre (16) à rampes inclinées d'une part, entre rouleaux (17) et la flasque (15) d'autre part, ainsi que la géométrie des pièces, crée de l'arc-boutement réalisant un freinage par adhérence. Lorsque l'arbre (13) tourne dans le sens anti-horaire par rapport à la flasque, les rouleaux se dégagent et permet une rotation libre par rapport à la flasque (15), pour la roue droite, et dans le sens horaire pour la roue gauche.The free wheel (16) has for this purpose, in a known manner, inclined ramps. The rollers (17) engage between the inclined ramps and the cylindrical interior surface of the flange (15), aided by a return spring acting on a roller cage. The friction between rollers (17) and the free wheel (16) with inclined ramps on the one hand, between rollers (17) and the flange (15) on the other hand, as well as the geometry of the parts, creates the arc -butting providing braking by adhesion. When the shaft (13) turns counterclockwise relative to the flange, the rollers disengage and allow free rotation relative to the flange (15), for the right wheel, and clockwise for the left wheel.

La main courante (11) entraîne la roue (40) munie d'un filetage (43).The handrail (11) drives the wheel (40) provided with a thread (43).

L'extrémité intérieure de la roue (40) présente un filetage (43) entraînant un équipage mobile (44) présentant une rampe (45).The inner end of the wheel (40) has a thread (43) driving a movable assembly (44) having a ramp (45).

Lorsque l'équipage mobile (44) est déplacé axialement vers l'extérieur, son extrémité extérieure conique convexe (41) vient en contact avec la surface d'appui concave (42) du moyeu (12) solidaire de la roue (10) et assure ainsi un accouplement entre la main courante (11) et la roue (10).When the mobile assembly (44) is moved axially outwards, its convex conical outer end (41) comes into contact with the concave bearing surface (42) of the hub (12) secured to the wheel (10) and thus ensures a coupling between the handrail (11) and the wheel (10).

Lorsque l'équipage mobile (44) est déplacé axialement vers l'intérieur, il assure la compression d'une bague de freinage (46), dont l'extrémité opposée s'appuie sur un cône (47) et dont la face extérieure vient exercer radialement un frottement progressif sur le moyeu (12) de la roue (10).When the mobile assembly (44) is moved axially inwards, it ensures the compression of a braking ring (46), the opposite end of which rests on a cone (47) and the outer face of which comes radially exert progressive friction on the hub (12) of the wheel (10).

Les caractéristiques du moyeu, notamment la course en translation de l'équipage mobile entre les deux extrémités, la longueur de l'équipage mobile, et le pas du filetage sont déterminés de façon à ce que le déplacement d'une extrémité à l'autre soit obtenu par une course angulaire relative entre la main courante et la roue associée d'environ 1°, et préférentiellement entre 0,1° et 10°, et plus préférentiellement entre 0.1° et 2°.The characteristics of the hub, in particular the translational travel of the movable element between the two ends, the length of the movable element, and the pitch of the thread are determined so that the movement from one end to the other is obtained by a relative angular travel between the handrail and the associated wheel of approximately 1°, and preferably between 0.1° and 10°, and more preferably between 0.1° and 2°.

Selon une variante, un ressort de rappel repousse en l'absence de sollicitation de la main courante par l'utilisateur, cette dernière dans sa position de marche avant. Ce ressort est par exemple disposé dans le moyeu pour repousser l'équipage mobile vers l'extérieur, en direction opposée du châssis. Ainsi, l'équipage mobile (44) est repoussé au repos dans une position où l'extrémité extérieure conique convexe (41) vient en contact avec la surface d'appui concave (42) du moyeu (12), sous l'action d'un ressort par exemple.According to a variant, a return spring pushes back in the absence of input from the handrail by the user, the latter in its forward position. This spring is for example arranged in the hub to push the movable assembly outwards, in the opposite direction of the chassis. Thus, the mobile assembly (44) is pushed back to rest in a position where the convex conical outer end (41) comes into contact with the concave bearing surface (42) of the hub (12), under the action of 'a spring for example.

Description détaillée de la roue droite selon une deuxième variante de réalisationDetailed description of the right wheel according to a second alternative embodiment

La figure 3 représente une vue en détail de la roue selon une deuxième variante de réalisation où la flasque contenant une roue libre à rouleaux est positionnée à l'intérieur du fauteuil.There Figure 3 represents a detailed view of the wheel according to a second alternative embodiment where the flange containing a free wheel with rollers is positioned inside the chair.

La roue comprend une flasque (15) coaxiale avec le moyeu (12).The wheel comprises a flange (15) coaxial with the hub (12).

La flasque (15) est fixée sur la surface intérieure du cadre (14) du fauteuil, par soudure ou par des boulons ou des rivets.The flange (15) is fixed to the interior surface of the frame (14) of the chair, by welding or by bolts or rivets.

Cette flasque (15) contient une roue libre (16) à rouleaux (17) autorisant la rotation de l'arbre (13), solidaire de la roue libre (16), dans le sens anti-horaire (sens trigonométrique), mais bloquant la rotation dans le sens horaire pour la roue droite.This flange (15) contains a free wheel (16) with rollers (17) allowing the rotation of the shaft (13), integral with the free wheel (16), in the anti-clockwise direction (trigonometric direction), but blocking clockwise rotation for the right wheel.

Pour la roue gauche, la flasque (25) contient une roue libre à rouleaux autorisant la rotation de l'arbre (23), solidaire de la roue, dans le sens horaire (sens antitrigonométrique), mais bloquant la rotation dans le sens antihoraire pour la roue droite.For the left wheel, the flange (25) contains a free roller wheel allowing the rotation of the shaft (23), integral with the wheel, in the clockwise direction (antitrigonometric direction), but blocking the rotation in the counterclockwise direction to the right wheel.

La roue libre (16) présente à cet effet, de manière connue, des rampes inclinées. Les rouleaux (17) s'engagent entre les rampes inclinées et la surface intérieure cylindrique de la flasque (15), aidés par un ressort de rappel agissant sur une cage à rouleaux. Le frottement entre rouleaux (17) et la roue libre (16) à rampes inclinées d'une part, entre rouleaux (17) et la flasque (15) d'autre part, ainsi que la géométrie des pièces, crée de l'arc-boutement réalisant un freinage par adhérence. Lorsque l'arbre (13) tourne dans le sens anti-horaire par rapport à la flasque, les rouleaux se dégagent et permettent une rotation libre par rapport à la flasque (15), pour la roue droite, et dans le sens horaire pour la roue gauche.The free wheel (16) has for this purpose, in a known manner, inclined ramps. The rollers (17) engage between the inclined ramps and the cylindrical interior surface of the flange (15), aided by a return spring acting on a roller cage. The friction between rollers (17) and the free wheel (16) with inclined ramps on the one hand, between rollers (17) and the flange (15) on the other hand, as well as the geometry of the parts, creates the arc -butting providing braking by adhesion. When the shaft (13) turns counterclockwise relative to the flange, the rollers disengage and allow free rotation relative to the flange (15), for the right wheel, and clockwise for the left wheel.

La main courante (11) entraîne l'arbre (40) munie d'un filetage (43).The handrail (11) drives the shaft (40) provided with a thread (43).

L'extrémité intérieure de la roue (40) présente un filetage (43) entraînant un équipage mobile (44) présentant une rampe (45).The inner end of the wheel (40) has a thread (43) driving a movable assembly (44) having a ramp (45).

Lorsque l'équipage mobile (44) est déplacé vers l'extérieur, son extrémité extérieure conique convexe (41) vient en contact avec la surface d'appui concave (42) du moyeu (12) solidaire de la roue (10) et assure ainsi un accouplement entre la main courante (11) et la roue (10).When the mobile assembly (44) is moved outwards, its convex conical outer end (41) comes into contact with the concave bearing surface (42) of the hub (12) integral with the wheel (10) and thus ensures a coupling between the handrail (11) and the wheel (10).

Lorsque l'équipage mobile (44) est déplacé axialement vers l'intérieur, il assure la compression d'une bague de freinage (46), dont l'extrémité opposée s'appuie sur un cône (47) et dont la face extérieure radialement vient exercer un frottement progressif sur le moyeu (12) de la roue (10).When the mobile assembly (44) is moved axially inwards, it ensures the compression of a braking ring (46), the opposite end of which rests on a cone (47) and the outer face of which radially comes to exert progressive friction on the hub (12) of the wheel (10).

Description détaillée de la roue droite selon une troisième variante de réalisationDetailed description of the right wheel according to a third alternative embodiment

La figure 4 représente une troisième variante de réalisation. La roue se distingue de la première variante de réalisation par le fait que la flasque (15) est fixée à la bague extérieure d'une roue libre (16) à rouleau (17). La bague intérieure de la roue libre à bille est fixée à l'axe latéral (13).There figure 4 represents a third alternative embodiment. The wheel differs from the first variant in that the flange (15) is fixed to the outer ring of a free wheel (16) with roller (17). The inner ring of the ball freewheel is fixed to the side axle (13).

Variante de réalisation de roues droite à moyeu intégréVariant version of straight wheels with integrated hub

La figure 5 représente une autre variante du système ayant pour avantage une meilleure compacité. La compacité garantissant entre autres à l'utilisateur le passage des portes.There Figure 5 represents another variant of the system having the advantage of better compactness. The compactness guarantees, among other things, the user's passage through doors.

La cinématique du système est identique aux variantes décrites précédemment. La différence de cette variante réside dans le fait que lesdits moyens de liaison (15) des axes latéraux avec le cadre sont situés dans un renfoncement intérieur du bouchon (47) fermant le moyeu.The kinematics of the system are identical to the variants described previously. The difference in this variant lies in the fact that said connecting means (15) of the lateral axes with the frame are located in an interior recess of the plug (47) closing the hub.

La liaison de l'axe latéral (13) au cadre est toujours réalisée au travers d'un moyen de liaison bloquant dans le sens horaire et libre en rotation dans le sens anti-horaire. La bague extérieure de la roue libre (16) à rouleaux (17) est fixée à une face intérieure du bouchon (47) lui-même solidaire de l'axe latéral (13). La bague intérieure de ladite roue libre à bille est fixée au cadre, au travers d'un second axe latéral (15)The connection of the lateral axis (13) to the frame is always carried out through a connecting means blocking in the clockwise direction and free to rotate in the counter-clockwise direction. The outer ring of the free wheel (16) with rollers (17) is fixed to an inner face of the plug (47) itself secured to the lateral axis (13). The inner ring of said free ball wheel is fixed to the frame, through a second lateral axis (15)

Adaptation d'un fauteuil existantAdaptation of an existing armchair

L'invention porte également sur un couple de roues associées aux mécanismes susvisés, pour permettre la transformation d'un fauteuil roulant existant.The invention also relates to a pair of wheels associated with the aforementioned mechanisms, to allow the transformation of an existing wheelchair.

Fixation des roues par un système d'attache rapideFixing the wheels using a quick release system

Une variante particulière illustrée par les figures 6 et 7 concerne la fixation des roues sur le cadre du fauteuil par un système d'attache rapide respectivement lorsque la roue est séparée du fauteuil et lorsque la roue est fixée sur le fauteuil.A particular variation illustrated by the figures 6 and 7 concerns the fixing of the wheels to the frame of the chair by a quick attach system respectively when the wheel is separated from the chair and when the wheel is fixed on the chair.

Un tel système est constitué par une tige formée de deux tronçons (100 et 120) coaxiaux et contigus, l'extrémité frontale avant du tronçon (100) venant en contact avec l'extrémité frontale arrière du tronçon (120), les deux tronçons (100, 120) étant libres en rotation relative.Such a system is constituted by a rod formed of two coaxial and contiguous sections (100 and 120), the front front end of the section (100) coming into contact with the rear front end of the section (120), the two sections ( 100, 120) being free in relative rotation.

La tige formée dans l'exemple décrit par les deux tronçons (100, 120) est traversée par une aiguille (110) coaxiale. Cette tige peut alternativement être réalisée en un seul tronçon traversant l'ensemble du moyen de la roue.The rod formed in the example described by the two sections (100, 120) is crossed by a coaxial needle (110). This rod can alternatively be made in a single section passing through the entire means of the wheel.

Le premier tronçon (100) traverse le moyen et l'axe creux (13).The first section (100) passes through the means and the hollow axis (13).

Le deuxième tronçon (120) traverse l'axe de la roue libre (16) à rouleaux.The second section (120) passes through the axis of the roller freewheel (16).

La paroi de l'extrémité avant du tronçon (120) présente des lumières pour le passage de billes (104) mobile radialement entre une position où elles forment une protubérance par rapport à la surface extérieure du tronçon (120), augmentant ainsi la section transversale, et une position centripète où elles s'effacent. En fonction de la position des billes, la section de la partie avant du tronçon (120) permet l'engagement dans un logement du châssis du fauteuil de section complémentaire à la section du tronçon (120), lorsque les billes sont en position centripète, et lorsque les billes sont chassées vers l'extérieur, elle assure le blocage du tronçon (120) dans le châssis du fauteuil.The wall of the front end of the section (120) has slots for the passage of balls (104) movable radially between a position where they form a protuberance relative to the exterior surface of the section (120), thus increasing the cross section , and a centripetal position where they disappear. Depending on the position of the balls, the section of the front part of the section (120) allows engagement in a housing of the chair frame with a section complementary to the section of the section (120), when the balls are in the centripetal position, and when the balls are pushed outwards, it ensures the blocking of the section (120) in the frame of the chair.

Une aiguille (110) traverse les deux tronçons (100, 120) et présente à son extrémité avant une gorge annulaire prolongée à l'avant par une partie terminale tronconique permettant de repousser les billes lors de l'engagement de l'aiguille (110) dans le canal intérieur de la tige (100, 120). La gorge annulaire présente un rayon de courbure complémentaire du rayon des billes (104). Lorsque cette gorge est repoussée au niveau des billes, elles peuvent se déplacer en position centripète. Au repos, un ressort (102) repousse l'aiguille (110) vers l'arrière, et la gorge annulaire se déplace de sorte que les billes sont chassées en position centrifuge par la section tubulaire de l'aiguille (110).A needle (110) passes through the two sections (100, 120) and has at its front end an annular groove extended at the front by a frustoconical end part allowing the balls to be pushed back when the needle (110) is engaged. in the inner channel of the rod (100, 120). The annular groove has a radius of curvature complementary to the radius of the balls (104). When this groove is pushed back to the level of the balls, they can move in a centripetal position. At rest, a spring (102) pushes the needle (110) backwards, and the annular groove moves so that the balls are expelled in a centrifugal position by the tubular section of the needle (110).

Le système d'attache rapide est muni d'un moyen anti-rotation, constitué par une patte (150) dont l'extrémité est destinée à être fixée sur une partie fixe du châssis du fauteuil roulant. L'extrémité de cette patte (150) présente une lumière pour l'engagement d'un ergot (151) prolongeant la surface du châssis du fauteuil.The quick attachment system is provided with an anti-rotation means, consisting of a tab (150) whose end is intended to be fixed on a fixed part of the wheelchair frame. The end of this tab (150) has a slot for engaging a lug (151) extending the surface of the chair frame.

Dans l'exemple illustré par la figure 8, ce moyen anti-rotation est constitué par un méplat de section complémentaire avec celle de l'extrémité avant du tronçon (120).In the example illustrated by figure 8 , this anti-rotation means is constituted by a flat section of complementary section with that of the front end of the section (120).

Claims (10)

  1. A wheelchair comprising a frame (1) and two main drive wheels (10,20) each coupled to a hand-rim (11,21) for actuating the wheels in both directions of rotation and for braking,
    characterized in that said frame (1) is equipped:
    • on the right-hand side in relation to the normal direction of movement
    ∘ by a connecting means (15) with a side shaft (13) locking in a clockwise direction and freely rotating in a counterclockwise direction
    ∘ the right hand-rim (11) being mounted freely rotating in relation to said side shaft (13), without freedom of axial translation
    ∘ the right wheel (10) being provided with a hub (12) connected to the hand-rim (11) by a connecting means locking in the clockwise direction
    ∘ said hub comprising a means of braking the rotation of the hub in relation to the side shaft, actuated by a counterclockwise movement of said hand-rim in relation to the side shaft
    • on the left-hand side in relation to the normal direction of movement
    ∘ by a left connecting means (25) with a side shaft (23) locking in the counterclockwise direction and freely rotating in the clockwise direction
    ∘ the left hand-rim (21) being mounted freely rotating in relation to the side shaft (23), without freedom of axial translation
    ∘ the left wheel (20) being provided with a hub (22) connected to the hand-rim by a connecting hub locking in the counterclockwise direction
    ∘ said hub (22) comprising a means of braking the rotation of the hub in relation to the side shaft, actuated by the clockwise movement of the hand-rim in relation to the side shaft.
  2. The wheelchair according to claim 1, characterized in that said connecting means of the side shafts with the frame are formed by roller freewheels.
  3. The wheelchair according to claim 1, characterized in that said connecting means of the side shafts with the frame are formed by ratchet freewheels.
  4. The wheelchair according to claim 1, characterized in that the connection area of the frame is located between said connecting means with a side shaft on the one hand, and the wheel and the hand-rim on the other hand.
  5. The wheelchair according to claim 1, characterized in that the connecting means of the side shaft with the frame comprises a rapid-connection means of said side shaft.
  6. A pair of wheels for a wheelchair according to claim 1, constituted of a an assembly for the right-hand side of the wheelchair in relation to the normal direction of movement, formed by
    ∘ a right hand-rim mounted freely rotating in relation to a side shaft, with no freedom of axial translation
    ∘ the right wheel being provided with a hub connected to said hand-rim by a connecting means locking in the clockwise direction
    ∘ said hub comprising a braking means for braking the rotation of said hub in relation to said side shaft, the right braking means being actuatable by a counterclockwise movement of the hand-rim in relation to said side shaft
    and by an assembly for the left-hand side of the wheelchair in relation to the normal direction of movement, formed by
    ∘ the left hand-rim mounted freely rotating in relation to a second side shaft with no freedom of axial translation
    ∘ the left wheel provided with a hub connected to said hand-rim by a connecting means locking in the counterclockwise direction
    ∘ said hub comprising a braking means for braking the rotation of said hub in relation to the side shaft, the braking means being actuatable by a clockwise movement of said hand-rim in relation to said side shaft.
  7. The pair of wheels for a wheelchair according to the preceding claim, characterized in that each wheel comprises a rapid-connection system.
  8. The pair of wheels for a wheelchair according to the preceding claim, characterized in that said rapid-connection system is formed by a rod formed by two sections (100 and 120) free in relative rotation with a coaxial pin (110) passing through the rod, the wall of the front end of the section (120) having apertures for a passage of balls (104) radially mobile between one position where they form a protuberance in relation to the outer surface of the section (120), thus increasing the cross-section, and one centripetal position where they are flush, the balls cooperating with an annular groove provided at a front of said pin (110).
  9. The pair of wheels for a wheelchair according to the preceding claim, characterized in that said rapid-connection system further comprises an anti-rotation means, formed by a tab (150), an end of the tab being configured to be fixed to a fixed part of the wheelchair frame.
  10. The pair of wheels for a wheelchair according to claim 8, characterized in that said rapid-connection system further comprises an anti-rotation means, formed by a flat piece formed at the front end of the section (120) of the rod.
EP19719575.3A 2018-04-03 2019-04-03 Wheelchair Active EP3773400B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1852876A FR3079412B1 (en) 2018-04-03 2018-04-03 WHEELCHAIR
PCT/FR2019/050766 WO2019193277A1 (en) 2018-04-03 2019-04-03 Wheelchair

Publications (3)

Publication Number Publication Date
EP3773400A1 EP3773400A1 (en) 2021-02-17
EP3773400B1 true EP3773400B1 (en) 2023-09-13
EP3773400C0 EP3773400C0 (en) 2023-09-13

Family

ID=63490527

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19719575.3A Active EP3773400B1 (en) 2018-04-03 2019-04-03 Wheelchair

Country Status (5)

Country Link
US (1) US11730644B2 (en)
EP (1) EP3773400B1 (en)
FR (1) FR3079412B1 (en)
PL (1) PL3773400T3 (en)
WO (1) WO2019193277A1 (en)

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Also Published As

Publication number Publication date
PL3773400T3 (en) 2024-02-12
WO2019193277A1 (en) 2019-10-10
US20210169715A1 (en) 2021-06-10
EP3773400A1 (en) 2021-02-17
FR3079412A1 (en) 2019-10-04
US11730644B2 (en) 2023-08-22
EP3773400C0 (en) 2023-09-13
FR3079412B1 (en) 2022-02-11

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