EP4225244A1 - Fauteuil roulant - Google Patents

Fauteuil roulant

Info

Publication number
EP4225244A1
EP4225244A1 EP21783358.1A EP21783358A EP4225244A1 EP 4225244 A1 EP4225244 A1 EP 4225244A1 EP 21783358 A EP21783358 A EP 21783358A EP 4225244 A1 EP4225244 A1 EP 4225244A1
Authority
EP
European Patent Office
Prior art keywords
wheelchair
roller
wheels
pair
frame
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.)
Pending
Application number
EP21783358.1A
Other languages
German (de)
English (en)
Inventor
Giancarlo Bonfiglioli
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.)
ACHA Srl
Original Assignee
ACHA Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ACHA Srl filed Critical ACHA Srl
Publication of EP4225244A1 publication Critical patent/EP4225244A1/fr
Pending legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/06—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps
    • A61G5/066—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs with obstacle mounting facilities, e.g. for climbing stairs, kerbs or steps with endless belts
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/125—Rests specially adapted therefor, e.g. for the head or the feet for arms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
    • A61G5/128—Rests specially adapted therefor, e.g. for the head or the feet for feet

Definitions

  • the present invention relates to a wheelchair.
  • Two main types of wheelchairs are known, those with manual push and those self-propelled, the self-propelled ones generally rest on the ground by means of two small motorized wheels and two idle wheels, generally between 15 cm and 30 cm in diameter, whereas in the case of wheelchairs with manual push there are either four small idle wheels, always with a diameter generally comprised between 15 cm and 30 cm, or two large wheels, with a diameter greater than 40 cm, and two smaller wheels.
  • These wheels which are substantially shaped like the bicycle wheels, have the problem of making it difficult to steer the wheelchair on uneven terrains. Furthermore, steering is particularly difficult on soft terrains, such as for example sandy terrains, which also have many irregularities in the form of small dunes.
  • the object of the present invention is that of overcoming this limit of the known art within a practical, efficient and low cost solution.
  • the invention particularly, makes available a wheelchair comprising:
  • roller for resting on the ground each associated with the frame, wherein the roller develops longitudinally along a longitudinal axis and is provided with a pair of opposite longitudinal ends, which are chamfered.
  • the wheelchair allows steering operations without uncertainties even on uneven and/or soft terrains since the roller thus shaped allows it to crawl on the terrain during steering even on the roughness of the terrain allowing to overcome them.
  • This feature is particularly important because, for example, it allows to overcome the small sand dunes on the beaches.
  • the longitudinal ends can be truncated conical in shape.
  • a portion of the lateral surface of the roller at each longitudinal end can be inclined between 20° and 40° with respect to a longitudinal axis of the roller.
  • the roller can be rotatably associated idle with the frame.
  • the roller can have a maximum diameter, measured along a transverse direction with respect to a longitudinal axis of the roller, of less than half of the diameter of the wheels of the pair of wheels.
  • the wheelchair can be of the self-propelled type and comprise a drive arrangement configured to set the pair of wheels in rotation with respect to the frame and provided with at least one electric motor adapted to supply the motion to the pair of wheels.
  • an aspect of the invention provides that the electric motor can be placed entirely at a vertical height greater than a vertical height of a wheel hub.
  • a self-propelled wheelchair is made available which allows the person sitting in the chair to cross streams and bodies of water much deeper than those that can be crossed with known wheelchairs. Furthermore, in this way the wheelchair user can immerse his legs completely or almost completely in the water even in total autonomy, thus allowing people with motor handicaps in the lower limbs greater freedom of movement and action.
  • the electric motor of which can be placed entirely at a vertical height from the ground greater than the maximum vertical height from the ground of the pair of wheels.
  • the motion generated by the electric motor is supplied to the wheels by means of a pair of rollers, each pressed in contact with a respective wheel.
  • the drive arrangement can comprise a first pulley fixed to the output shaft of the motor, a second pulley integral in rotation to a wheel of the pair of wheels, and a flexible connecting member adapted to transmit a rotary motion between the first pulley and the second pulley.
  • this solution allows to position the motor at a vertical height greater than in the first embodiment of the drive arrangement, since in said first embodiment the distance of the motor from the wheel affects the diameter of the roller which is pressed on the wheel to set it in rotation, therefore this diameter could become excessively bulky beyond a certain vertical height of the motor. Whereas in the case of the second embodiment of the drive arrangement, the distance has no influence on the size of the first pulley or of the second pulley, thus guaranteeing, always with the same distance, greater compactness and usability of the wheelchair.
  • the electric motor can be placed entirely at a vertical height greater than the maximum vertical height of the wheels.
  • it can be placed 20 cm or 30 cm above the maximum vertical height of the wheels.
  • Figure 1 is an orthogonal lateral schematic view of a wheelchair according to the invention.
  • Figure 2 is an orthogonal lateral schematic view of the wheelchair of Figure 1 .
  • Figure 3 is an orthogonal lateral schematic view of a second embodiment of the wheelchair according to the invention.
  • Figure 4 is an orthogonal lateral schematic view of a third embodiment of the wheelchair according to the invention.
  • Figure 5 is an orthogonal lateral schematic view of a fourth embodiment of the wheelchair according to the invention.
  • Figure 6 is an orthogonal lateral schematic view of a fifth embodiment of the wheelchair according to the invention.
  • Figure 7 is an orthogonal lateral schematic view of a sixth embodiment of the wheelchair according to the invention.
  • 1 a,1 b,1 c,1d,1 e,1f generally indicate a wheelchair, in particular of the self-propelled type, i.e. capable of moving independently without the aid of motor power imparted by user of the chair or a companion.
  • the invention i.e. the presence of a roller 50 as will be described below, does not necessarily need to be implemented in a self-propelled wheelchair, as it could also be implemented in a wheelchair of the manual push type.
  • the wheelchair is preferably of the self-propelled type, since this type guarantees greater manoeuvring freedom to the user.
  • a wheelchair able to accommodate a person is illustrated, but the wheelchair can be sized and equipped (with suitable seats) to carry even more than one person at the same time.
  • the wheelchair 1 comprises a frame 5, for example tubular, although any other type of frame suitable for the purpose is equivalent.
  • a seat (not illustrated in the drawings) can be fixed to the frame 5 which has the purpose of supporting the wheelchair user at the bottom, for example this seat can comprise a substantially horizontal cushion which is fixed to the frame 5.
  • the wheelchair can also comprise a backrest (not illustrated) placed at least partially at a higher level than the seat and shaped so that the wheelchair user can rest his back against it.
  • a backrest (not illustrated) placed at least partially at a higher level than the seat and shaped so that the wheelchair user can rest his back against it.
  • the wheelchair 1 comprises at least one pair of wheels 10 for resting on the ground (i.e. which contact the ground while keeping the frame raised therefrom), each of which is provided with a hub 15 by means of which the respective wheel 10 is rotatably associated with the frame 5 with respect to an axis of rotation R.
  • the wheels 10 of the pair of wheels 10 are rotatably associated with the frame 5 on opposite sides of the frame thereof.
  • they are rotatably associated with the frame on opposite sides of the frame thereof with respect to a centre plane of the wheelchair which extends from a front area to a rear area of the chair itself.
  • the axes of rotation R of the wheels 10 are coaxial, i.e. the pair of wheels is rotatably associated with the frame 5 with respect to a single axis of rotation R.
  • the axis of rotation R preferably lies on a horizontal plane.
  • the axes of rotation of the wheels 10 may be incident and inclined to each other, as is the case for example in wheelchairs for sports use.
  • Each wheel 10 comprises a tyre or tire provided with a tread 20 and which is mounted on a rim integral in rotation with the hub 15, for example by means of spokes, although it cannot be excluded that the rim may be made as a solid discoidal body comprising the hub.
  • At least the portion of tyre or tire in which the tread is present is made of a material with a high coefficient of friction, for example of rubber.
  • Each wheel 10 has a diameter, measured in a direction perpendicular to the axis of rotation R, at least greater than 40 cm, preferably comprised between 55 cm and 70 cm. The use of large diameter wheels helps in overcoming uneven terrains.
  • the wheelchair 1 can comprise a drive arrangement, which makes it self-propelled, configured to set said pair of wheels 10 in rotation with respect to the frame 5 in order to selectively move the wheelchair itself forward or backward.
  • the drive arrangement comprises at least one electric motor 25 fixed to the frame and which supplies the rotary motion, i.e. the driving torque, necessary to set the wheels in rotation in order to selectively move the wheelchair forward or backward.
  • the electric motor 25 comprises an output shaft by means of which the rotary motion generated by the electric motor thereof is transmitted, i.e. from which output shaft it is possible to withdraw the rotary motion.
  • the motor comprises a protective casing or housing in which a plurality of windings (or solenoids) are housed and from which the output shaft which is connected to the wheels 10 to transmit the rotary motion comes out.
  • the electric motor 25 is an electric gearmotor, i.e. inside the casing there is also a gear unit, generally with gears, which is placed upstream of the output shaft with respect to the direction of transmission of the rotary motion.
  • the electric motor 25 can be supplied by an electric supply battery fixed to the frame 5.
  • the figures show six embodiments of the wheelchair, of which those illustrated in figures 1 to 4 are provided with a first embodiment of the drive arrangement and those illustrated in figures 5 to 5 are provided with a second embodiment of the drive arrangement.
  • the electric motor 25, i.e. the electric gearmotor, is placed entirely at a vertical height from the ground on which the wheels 10 rest greater than the vertical height from the ground of the wheel hub, i.e. greater than the vertical height of both hubs of the two wheels 10 (in the embodiment illustrated, since there is a single axis of rotation R, the hubs are at the same vertical height). These heights are to be understood when the wheelchair is located on a horizontal plane.
  • the electric motor 25 is located entirely at a vertical height from the ground greater than the height of the intersection point between the axis of rotation R and a vertical plane that intersects the ground at a contact area of the wheel with the ground.
  • the electric motor 25 is placed entirely at a vertical height from the ground greater than 3/4 of the diameter of the wheel 10.
  • the electric motor 25 is placed entirely at a vertical height from the ground greater than the diameter of the wheel 10.
  • the electric motor 25 is placed at least 20cm above the maximum height of the wheel 10. Overall, the motor can therefore be positioned at a vertical distance of about one meter from the ground on which the wheels 10 rest.
  • the output shaft of the electric motor 25 rotates with respect to an eccentric axis of rotation, and for example parallel to the axis of rotation R.
  • This mechanism is not further described as it is known to those skilled in the art.
  • the motors are both positioned above the vertical heights described above.
  • the drive arrangement of the wheelchair 1 a,1 b,1 c comprises a pair of rollers 30 which receive the motion from the electric motor 25, and in which each of said rollers is pressed in contact with a respective wheel 10, possibly with the aid of an elastic element.
  • each roller is pressed in contact with the tread 20 of the respective wheel 10.
  • the roller has a layer of material with a high coefficient of friction, for example of rubber.
  • these rollers 30 receive the rotary motion, i.e. the driving torque, from a respective electric motor, or electric gearmotor, 25.
  • each roller can be keyed to the output shaft of the respective electric motor, or electric gearmotor 25.
  • the electric motor 25 is placed in a position in which it is located at least partially at a vertical height from the ground comprised between three quarters of the wheel diameter and the entire wheel diameter.
  • the electric motor could be located entirely at a height greater than the maximum height of the wheel.
  • the electric motor of the wheelchair 1 d, 1 e, 1 f is placed entirely at a vertical height greater than the maximum vertical height of the wheels, for example at least 20 cm or 30 cm above said maximum height, and the drive arrangement comprises a first pulley 35 connected, for example keyed, to the output shaft of the electric motor 25, a second pulley 40 integral in rotation with a wheel 10 of the pair of wheels with respect to the axis of rotation R, and a flexible connecting member 45 at least partially wound on said pulleys to transmit the motion from the first pulley 35 to the second pulley 40.
  • the drive arrangement comprises a pair of first pulleys 35 connected to a respective electric motor 25, i.e. to the output shaft thereof, a pair of respective second pulleys 40, each integral in rotation with respect to the axis of rotation R to a respective wheel 10, and a pair of flexible connecting members 45 which connect a first pulley to the respective second pulley.
  • the flexible connecting member 45 is a chain and the pulleys 35,40 are provided with an external toothing, i.e. they are shaped like toothed wheels with external toothing, which mesh with the links of chain.
  • the motor i.e. the motors, could also be located only at a vertical height from the ground greater than the vertical height of the hub.
  • the wheelchair 1 a,1 b,1 c,1 d,1 e,1 f comprises, in addition to the pair of wheels 10, also another element for resting on the ground, which comprises, i.e. is constituted by, a roller 50 resting on the ground.
  • the roller 50 is associated with the frame, for example rotatably associated idle with the frame with respect to an axis of rotation K, preferably lying on a horizontal plane, for example parallel to the axis of rotation R.
  • this rotation with respect to the axis K is the only degree of freedom of the roller 50 with respect to the frame.
  • the roller could also be tilting with respect to a horizontal axis perpendicular to the K axis.
  • the roller has an elongated shape along a longitudinal axis and is arranged with a longitudinal axis parallel to the axis of rotation K.
  • roller 50 contacts the ground.
  • roller is idle, however it is not excluded that it can be motorized and rotated by a suitable mechanism.
  • This roller has (only) two opposite longitudinal ends of chamfered shape, i.e. at least at the opposite longitudinal ends the area of a cross section of the roller (identified by the intersection of the roller with an imaginary section plane perpendicular to the longitudinal axis) gradually decreases with respect to the area of a cross section of a central portion of the roller.
  • This chamfer i.e. the portion in which the cross-sectional area gradually decreases, has a length equal to or greater than 5 cm measured along a direction parallel to the longitudinal axis of the roller 5, i.e. parallel to the axis of rotation K. It is not excluded that from a plane of central symmetry perpendicular to the longitudinal axis of the roller, the roller always has a decreasing section area running from this plane to the respective longitudinal ends. At the point where the cross section of a longitudinal end is smaller, it has an area of less than at least 3/4 of the cross section of a central portion of the roller.
  • Said longitudinal ends i.e. the chamfers, truncated conical in shape, i.e. at least at the longitudinal ends the roller 50 comprises respective outer surfaces that are truncated conical in shape.
  • these conical surfaces are inclined at an angle comprised between 20° and 30° with respect to the longitudinal axis of the roller.
  • the roller comprises a cylindrical central portion from which the two truncated conical surfaces present at the longitudinal ends extend in the distancing direction.
  • the roller at least in the central portion thereof, i.e. the cylindrical one, has a diameter of less than half of the diameter of the wheel 10.
  • the roller 50 can be rigid, i.e. not deformable in bending or twisting or crushing under the normal work loads to which it is subjected when the wheelchair is used.
  • the roller can be made of plastic.
  • the wheelchair rests on the ground solely by means of the wheels 10 and the roller 50.
  • the roller 50 for resting on the ground can be positioned both in front and behind the pair of wheels 10 with respect to the normal forward direction of the wheelchair.
  • the other element for resting on the ground may comprise a pair of wheels, for example of smaller diameter than the pair of wheels 10. That is, in an embodiment not illustrated, the wheelchair does not comprise the roller 50, but is in any case provided with the drive arrangement of the wheels as described above.
  • the wheelchair when the roller 50 is placed in front of the pair of wheels 10, the wheelchair can comprise a further roller 55 associated with the frame, for example rotatably associated with it in an idle manner, and positioned behind the pair of wheels 10.
  • roller 55 is positioned so as not to touch the ground when the wheelchair is located on a flat, horizontal surface. In practice, when the chair touches the ground by means of the pair of wheels 10 and the roller 50, the roller 55 is raised from the ground.
  • the further roller 55 offers a backward anti-tipping function for the wheelchair, without hindering the forward movement under normal conditions.
  • Figures 1 and 2 illustrates a first embodiment of the wheelchair indicated with 1 a and which differs in particular from the other embodiments in that the drive arrangement comprises the rollers 30 and in that the roller 50 is positioned in front of the pair of wheels 10.
  • Figure 3 illustrates a second embodiment of the wheelchair indicated with 1 b, which has the same characteristics as the embodiment indicated with 1 a and which in addition is provided with the further roller 55.
  • Figure 4 illustrates a third embodiment of the wheelchair indicated with 1 c, which has the same characteristics as the embodiment indicated with 1 a except for the fact that in the form of action 1 c the roller 50 is placed behind the pair of wheels 10 instead of at the front as in 1 a.
  • Figure 5 illustrates a fourth embodiment of the wheelchair indicated with 1 d, which has the same characteristics as the embodiment indicated with 1 a except for the fact that in the form of action 1 d the drive arrangement is the one of the second embodiment of the drive arrangement, i.e. the drive arrangement in place of the roller that contacts the wheel comprises the pulleys connected by the flexible connecting member.
  • Figure 6 illustrates a fifth embodiment of the wheelchair indicated with 1 e, which has the same characteristics as the embodiment indicated with 1 d and which in addition is provided with the further roller 55.
  • Figure 7 illustrates a sixth embodiment of the wheelchair indicated with 1f, which has the same characteristics as the embodiment indicated with 1 d except for the fact that in the form of action 1 f the roller 50 is placed behind the pair of wheels 10 instead of front as in 1d.
  • the wheels 10 are selectively or simultaneously set in rotation by means of the driving torque generated by the electric motor 25, i.e. by the two electric motors 25, which being located at a high height compared to known wheelchairs, are protected from water, thus allowing them to tackle streams or bodies of water of considerable depth.
  • the roller 55 crawls and rotates on the terrain, and therefore on the roughness present, such as for example small sand dunes, guaranteeing steering without uncertainty.

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)
  • Handcart (AREA)

Abstract

Fauteuil roulant (1a,1b,1c,1d,1e,1f) comprenant : un cadre (5), une paire de roues (10) pour reposer sur le sol, chacune associée de façon rotative au cadre (5), et un rouleau (50) pour reposer sur le sol et associé au cadre (5), le rouleau se développant longitudinalement sur un axe longitudinal et étant pourvu d'une paire d'extrémités longitudinales opposées, lesquelles sont chanfreinées.
EP21783358.1A 2020-10-12 2021-10-05 Fauteuil roulant Pending EP4225244A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202000023926 2020-10-12
PCT/IB2021/059102 WO2022079541A1 (fr) 2020-10-12 2021-10-05 Fauteuil roulant

Publications (1)

Publication Number Publication Date
EP4225244A1 true EP4225244A1 (fr) 2023-08-16

Family

ID=73793755

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21783358.1A Pending EP4225244A1 (fr) 2020-10-12 2021-10-05 Fauteuil roulant

Country Status (2)

Country Link
EP (1) EP4225244A1 (fr)
WO (1) WO2022079541A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002240752A (ja) * 2001-02-12 2002-08-28 Mitsutoshi Hashiba 手押し運搬車両用クローラーの構造
JP4108558B2 (ja) * 2003-01-31 2008-06-25 株式会社ボックス キャスター
US8783392B2 (en) * 2009-08-04 2014-07-22 Freedom One Mobility Llc Tracked mobility device

Also Published As

Publication number Publication date
WO2022079541A1 (fr) 2022-04-21

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