EP4096609A1 - Universal attachment for an additional wheel for wheelchairs - Google Patents

Universal attachment for an additional wheel for wheelchairs

Info

Publication number
EP4096609A1
EP4096609A1 EP21711017.0A EP21711017A EP4096609A1 EP 4096609 A1 EP4096609 A1 EP 4096609A1 EP 21711017 A EP21711017 A EP 21711017A EP 4096609 A1 EP4096609 A1 EP 4096609A1
Authority
EP
European Patent Office
Prior art keywords
fastening means
hole
means according
clamp
pin
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
EP21711017.0A
Other languages
German (de)
French (fr)
Inventor
Stefano Troncone
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.)
Pandhora Srl
Original Assignee
Pandhora 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 Pandhora Srl filed Critical Pandhora Srl
Publication of EP4096609A1 publication Critical patent/EP4096609A1/en
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
    • A61G5/04—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven
    • A61G5/047—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven by a modular detachable drive system
    • 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
    • A61G5/1054—Large wheels, e.g. higher than the seat portion

Definitions

  • the present invention relates to the technical field comprising wheelchairs for disabled and systems connected thereto to increase the using modes of these aid devices.
  • the present invention relates to a universal coupling for an additional wheel for wheelchairs for disabled.
  • the present invention aims at developing a coupling system for an additional wheel, or other transporting device, for example of parcel grid type, couplable to the wheelchair, in order to increase the using modes.
  • electric propulsion units are known, made up of a fork provided with steer, to which an electric motorized wheel is keyed, comprising a battery.
  • the coupling system to the wheelchair is made up of U-shaped tubes, in turn connected to the wheelchair steer tube by means of a pivoting system.
  • the U-shaped tubes are introduced in holes provided on the clamps connected to the wheelchair frontal portion.
  • By screwing manually actuated screws provided laterally on the clamps it is possible to tighten the tubes inside the holes and by pulling to oneself the wheelchair steer the pivoting system is blocked in a stable position, thus determining the wheelchair frontal wheels to be lifted. The system is thus ready to move the wheelchair electrically .
  • a first technical problem arises from the fact that the presence of manually actuated tightening screws mounted on the wheelchair frame increases remarkably its lateral dimension, thus making it difficult to enter particularly narrow places with the wheelchair, as for example a lift.
  • a common problem to all the embodiments known at the state of the art is the adaptability to the dimensions of the wheelchair frame, which can vary from a wheelchair model to another one for dimension (wheelchair width), for shape (oval, circular or rectangular tube cross-section) and for inclination (the arrangement of the tubes of the wheelchair to which the additional wheel is coupled can be vertical or inclined according to an arbitrary angle).
  • Aim of the present invention is to provide a device for coupling an additional wheel to a wheelchair, which can be adapted to any geometry of the wheelchair frame, irrespective of the shape and arrangement of the tubes making up the frame.
  • the present invention provides an adjustable clamp, which can be adapted to the shape and geometry of any wheelchair frame.
  • the present invention provides a coupling system of an additional wheel to a manual wheelchair, which is simply couplable both by the user while sitting in the wheelchair and by his assistant .
  • the present invention provides a coupling system which does not increase the side dimensions of the wheelchair when the additional wheel is decoupled from the wheelchair.
  • the present invention realizes the prefixed aims since it is a fastening means of an additional wheel to a wheelchair (26) for disabled, said additional wheel (19) comprising a fork fastened to a steer tube, said fastening means comprising at least a clamp (3) comprising two specular half clamps, each one provided with an inner half housing (25) to house a tube of the wheelchair frame and with a fastening system to said additional wheel, said half-housing (25) comprising a groove with the inclined side surfaces, so that when the two half-housings (25) are faced to each other they can scarf a tube positioned therein, said clamp comprising a first through hole (1) and a plurality of through holes (2), whose centres are arranged along an arc of circle having centre on said first through hole (1).
  • the coupling for coupling an additional wheel to a wheelchair comprises a shaft (18), hinged transversely in a suitable housing provided on the steer tube of the additional wheel (19) to be fastened to the wheelchair. Once the shaft (18) is in position, it is in horizontal position, at a defined height from the length of the steer tube of the additional wheel.
  • the additional wheel (19) for wheelchair (26), known per se at the state of the art, comprises a wheel (20) hinged to a fork, said fork being in turn fastened to a steer tube.
  • the shaft (18) is hinged to the steer tube, and so it can rotate around its own axis.
  • the device according to the invention comprises blocking means (23) to block the rotation of the shaft (18).
  • said blocking means (23) comprise screws screwed in a hole provided in the housing of the steer shell in which the shaft (18) rotates, and configured to generate interference, when tightened, with the shaft (18).
  • a first end of each arm is introduced on a respective side of said shaft (18), and the sliding movement can be blocked by means of fixing means
  • each arm (17) has circular cross section.
  • the device comprises also a couple of clamps (3), configured to allow the arms (17) to be fastened to the wheelchair frame.
  • Each clamp (3) comprises two specular half-clamps, each provided with an inner half-housing (25) to house a tube of the wheelchair frame and with a fastening system to the arms (17).
  • the half-housing (25) comprises a groove with the inclined side surfaces, so that when the two half-housings (25) are faced to each other, as it is shown in figure 1, they can scarf a tube positioned therein.
  • Each clamp (3) is fastened to the tube (17) instead by means of a respective rapid blocking pin (4), described in detail in the following, which can be fastened according to various clamp directions.
  • the pin (4) is provided with a couple of through holes (14, 15) provided on a rod (13), while the clamp is provided with a first through hole (1) and a plurality of circular through holes (2), whose centres are arranged along an arc of circle having centre on the first through hole (1).
  • the clamp is fastened to the rapid blocking pin (4) by means of a couple of screws (16), the first one being introduced in said first through hole, and the second one being introduced in a hole selected between said plurality of circular through holes (2) whose centres are arranged along an arc of circle.
  • the clamp (3) allows to vary the relative angle between said arms (17) and the tube of the wheelchair, to which the same are fastened.
  • the pin (4) in addition to the rod (13), comprises coupling means configured to fasten removably said pin (5) coaxially to the second end of a respective side arm ⁇ 11).
  • the pin (4) comprises a terminal thickening (5) next to a groove (6) and an abutment disc (8) provided with a frustum of cone abutment surface (7).
  • Each side arm (17) comprises a coupling (9) configured to fasten and release easily said rapid coupling pin, so that the same is arranged coaxially to the second end of the respective arm
  • said couplings (9) are introduced in the side arms and fastened by mans of blocking dowels (10), but other fastening means are allowed.
  • the side couplings are provided with an end provided with a beveled inner edge (12), with bevel angle equal to the one of said frustum of cone abutment surface (7), so that the abutment surface can rest on said beveled edge, as it is shown in figure 2.
  • Each tubular coupling (9) is also provided with a through hole orthogonal to its own axis, inside which a tightening screw (22) with frustum of cone bit is screwed, configured to be introduced inside the groove (6) and to block the pin (4) inside the tubular coupling (9), with the conical portion in abutment on the beveled inner edge.
  • each one of the clamps (3) comprises two halves, each provided with a first side through hole (1) and on the opposite side a series of through holes (2) arranged along an arc trajectory which as centre has the centre of the first through hole (1), serves to determine the inclination of the pins (4) by adapting to the inclination of the tubes which make up the wheelchair frame.
  • said thickening (5) of each one of said pins (4) is provided with a rounded bit (5), configured to facilitate the introduction of the pins (4) in the tubular couplings (9).
  • the additional wheel (19) for wheelchairs can be of electric propulsion type and comprise actuation and control means.
  • the tightening screws (22) with frustum of cone bit, which block the pin (4) inside the tubular coupling (9) can be actuated by an electric motor.
  • the coupling for coupling an additional wheel can be also carried out by using only one clamp (3), only one pin (4) and only one tubular coupling (9).
  • the coupling can be used for coupling a transport device, for example of parcel grid type, coupled to the wheelchair.

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)
  • Axle Suspensions And Sidecars For Cycles (AREA)

Abstract

Fastening means of an additional wheel to a wheelchair (26) for disabled, said additional wheel (19) comprising a fork fastened to a steer tube, said fastening means comprising at least a clamp (3) comprising two specular half-clamps, each one provided with an inner half-housing (25) to house a tube of the wheelchair frame and with a fastening system to said additional wheel, said half-housing (25) comprising a groove with the inclined side surfaces, so that when the two half-housings (25) are faced to each other they can scarf a tube positioned therein, said clamp comprising a first through hole (1) and a plurality of through holes (2), whose centres are arranged along an arc of circle having centre on said first through hole (1).

Description

UNIVERSAL ATTACHMENT FOR AN ADDITIONAL WHEEL FOR
WHEELCHAIRS
DESCRIPTION Technical field
The present invention relates to the technical field comprising wheelchairs for disabled and systems connected thereto to increase the using modes of these aid devices.
In particular, the present invention relates to a universal coupling for an additional wheel for wheelchairs for disabled.
The present invention aims at developing a coupling system for an additional wheel, or other transporting device, for example of parcel grid type, couplable to the wheelchair, in order to increase the using modes.
State of the art
At the state of the art, there are known electric propulsion units for wheelchairs, consisting of electrically motorized wheels which, once connected to a manual wheelchair, convert it into an electric propulsion wheelchair.
Various embodiments of this kind of systems are known, each one being different for the coupling to the frame of a manual wheelchair. For example, electric propulsion units are known, made up of a fork provided with steer, to which an electric motorized wheel is keyed, comprising a battery. The coupling system to the wheelchair is made up of U-shaped tubes, in turn connected to the wheelchair steer tube by means of a pivoting system.
The U-shaped tubes are introduced in holes provided on the clamps connected to the wheelchair frontal portion. By screwing manually actuated screws provided laterally on the clamps it is possible to tighten the tubes inside the holes and by pulling to oneself the wheelchair steer the pivoting system is blocked in a stable position, thus determining the wheelchair frontal wheels to be lifted. The system is thus ready to move the wheelchair electrically .
Devices of this kind are described for example in the Italian Patent 0001417628, in the document US 9,326,901 and in the Italian utility model n° 0000279363 .
Disadvantageously, the just described devices and other similar ones known at the state of the art are difficult to be coupled to the wheelchair.
A first technical problem arises from the fact that the presence of manually actuated tightening screws mounted on the wheelchair frame increases remarkably its lateral dimension, thus making it difficult to enter particularly narrow places with the wheelchair, as for example a lift.
Other producers have solved this problem by arranging gripping couplings only on the electric propulsion unit. But such system results little reliable since each time it is desired to couple the electric propulsion unit to the wheelchair, the disabled user has to come closer to the electric propulsion unit and has to try to actuate it always keeping the same coupling point to the frame. Moreover, such system is not apt to all wheelchair models since the frames are different for dimensions and horizontal or vertical position of their tubes.
There exist also systems provided with a single central coupling. However, such systems are not preferred by the users, since a coupling element is between the legs of the user while sitting in the wheelchair, and this fact results uncomfortable and annoying for the user.
Finally, a common problem to all the embodiments known at the state of the art is the adaptability to the dimensions of the wheelchair frame, which can vary from a wheelchair model to another one for dimension (wheelchair width), for shape (oval, circular or rectangular tube cross-section) and for inclination (the arrangement of the tubes of the wheelchair to which the additional wheel is coupled can be vertical or inclined according to an arbitrary angle).
Aim
Aim of the present invention is to provide a device for coupling an additional wheel to a wheelchair, which can be adapted to any geometry of the wheelchair frame, irrespective of the shape and arrangement of the tubes making up the frame.
More in particular, the present invention provides an adjustable clamp, which can be adapted to the shape and geometry of any wheelchair frame.
Yet, the present invention provides a coupling system of an additional wheel to a manual wheelchair, which is simply couplable both by the user while sitting in the wheelchair and by his assistant .
According to another aim, the present invention provides a coupling system which does not increase the side dimensions of the wheelchair when the additional wheel is decoupled from the wheelchair.
Brief description The present invention realizes the prefixed aims since it is a fastening means of an additional wheel to a wheelchair (26) for disabled, said additional wheel (19) comprising a fork fastened to a steer tube, said fastening means comprising at least a clamp (3) comprising two specular half clamps, each one provided with an inner half housing (25) to house a tube of the wheelchair frame and with a fastening system to said additional wheel, said half-housing (25) comprising a groove with the inclined side surfaces, so that when the two half-housings (25) are faced to each other they can scarf a tube positioned therein, said clamp comprising a first through hole (1) and a plurality of through holes (2), whose centres are arranged along an arc of circle having centre on said first through hole (1).
Detailed description
In a preferred embodiment shown in the appended figures, the coupling for coupling an additional wheel to a wheelchair comprises a shaft (18), hinged transversely in a suitable housing provided on the steer tube of the additional wheel (19) to be fastened to the wheelchair. Once the shaft (18) is in position, it is in horizontal position, at a defined height from the length of the steer tube of the additional wheel.
It is to be specified that the additional wheel (19) for wheelchair (26), known per se at the state of the art, comprises a wheel (20) hinged to a fork, said fork being in turn fastened to a steer tube.
The shaft (18) is hinged to the steer tube, and so it can rotate around its own axis.
Therefore, the device according to the invention comprises blocking means (23) to block the rotation of the shaft (18).
In a preferred but not limiting embodiment, said blocking means (23) comprise screws screwed in a hole provided in the housing of the steer shell in which the shaft (18) rotates, and configured to generate interference, when tightened, with the shaft (18).
At the opposite ends of said shaft (18), two L- shaped side arms (17) are fastened slidingly.
A first end of each arm is introduced on a respective side of said shaft (18), and the sliding movement can be blocked by means of fixing means
(24), such for example interference dowel. The second end of each arm (17) has circular cross section.
The device comprises also a couple of clamps (3), configured to allow the arms (17) to be fastened to the wheelchair frame.
Each clamp (3) comprises two specular half-clamps, each provided with an inner half-housing (25) to house a tube of the wheelchair frame and with a fastening system to the arms (17).
Preferably, the half-housing (25) comprises a groove with the inclined side surfaces, so that when the two half-housings (25) are faced to each other, as it is shown in figure 1, they can scarf a tube positioned therein.
Each clamp (3) is fastened to the tube (17) instead by means of a respective rapid blocking pin (4), described in detail in the following, which can be fastened according to various clamp directions.
To such aim, the pin (4) is provided with a couple of through holes (14, 15) provided on a rod (13), while the clamp is provided with a first through hole (1) and a plurality of circular through holes (2), whose centres are arranged along an arc of circle having centre on the first through hole (1). The clamp is fastened to the rapid blocking pin (4) by means of a couple of screws (16), the first one being introduced in said first through hole, and the second one being introduced in a hole selected between said plurality of circular through holes (2) whose centres are arranged along an arc of circle.
The selection of the hole for the application of the second screw determines clearly the relative inclination of the rapid blocking pin (5) with respect to the housing (25) for the wheelchair frame tube.
In other words, the clamp (3) allows to vary the relative angle between said arms (17) and the tube of the wheelchair, to which the same are fastened. The pin (4), in addition to the rod (13), comprises coupling means configured to fasten removably said pin (5) coaxially to the second end of a respective side arm {11).
To such aim, the pin (4) comprises a terminal thickening (5) next to a groove (6) and an abutment disc (8) provided with a frustum of cone abutment surface (7).
Each side arm (17) comprises a coupling (9) configured to fasten and release easily said rapid coupling pin, so that the same is arranged coaxially to the second end of the respective arm
(17). Preferably, said couplings (9) are introduced in the side arms and fastened by mans of blocking dowels (10), but other fastening means are allowed. The side couplings are provided with an end provided with a beveled inner edge (12), with bevel angle equal to the one of said frustum of cone abutment surface (7), so that the abutment surface can rest on said beveled edge, as it is shown in figure 2.
Each tubular coupling (9) is also provided with a through hole orthogonal to its own axis, inside which a tightening screw (22) with frustum of cone bit is screwed, configured to be introduced inside the groove (6) and to block the pin (4) inside the tubular coupling (9), with the conical portion in abutment on the beveled inner edge.
As yet said, the fact that each one of the clamps (3) comprises two halves, each provided with a first side through hole (1) and on the opposite side a series of through holes (2) arranged along an arc trajectory which as centre has the centre of the first through hole (1), serves to determine the inclination of the pins (4) by adapting to the inclination of the tubes which make up the wheelchair frame. Moreover, preferably, said thickening (5) of each one of said pins (4) is provided with a rounded bit (5), configured to facilitate the introduction of the pins (4) in the tubular couplings (9).
Moreover, being the tightening screws (22) integral to the additional wheel and not to the wheelchair, the dimensions of this latter one is reduced once the portions are decoupled from each other.
It is to be specified, without departing from the aims of the invention, that the additional wheel (19) for wheelchairs can be of electric propulsion type and comprise actuation and control means.
In another embodiment of the invention, the tightening screws (22) with frustum of cone bit, which block the pin (4) inside the tubular coupling (9) can be actuated by an electric motor.
Moreover, the coupling for coupling an additional wheel can be also carried out by using only one clamp (3), only one pin (4) and only one tubular coupling (9).
In order to widen the usage of the invention, the coupling can be used for coupling a transport device, for example of parcel grid type, coupled to the wheelchair.

Claims

1. Fastening means of an additional wheel to a wheelchair (26) for disabled, said additional wheel (19) comprising a fork fastened to a steer tube, said fastening means comprising at least a clamp (3) comprising two specular half-clamps, each one provided with an inner half-housing (25) to house a tube of the wheelchair frame and with a fastening system to said additional wheel, said half-housing (25) comprising a groove with the inclined side surfaces, so that when the two half housings (25) are faced to each other they can scarf a tube positioned therein, said clamp comprising a first through hole (1) and a plurality of through holes (2), whose centres are arranged along an arc of circle having centre on said first through hole (1).
2. Fastening means according to claim 1, comprising further:
- a shaft (18), hinged transversely in a relative housing provided on said steer tube of said additional wheel (19);
- blocking means (23) to block the rotation of said shaft (18), and characterized in that at the opposite ends of said shaft (18), two L- shaped side arms (17) are fastened slidingly, a first end of each arm (17) being introduced on a respective side of said shaft (18), and the second end of each arm (17) being fastened to a respective clamp (3).
3. Fastening means according to claim 2, characterized in that said blocking means (23) comprise screws screwed in a hole provided in the housing of the steer shell in which the shaft (18) rotates, and configured to generate interference, when tightened, with the shaft (18).
4. Fastening means according to claim 3, characterized in that each clamp (3) is fastened to the tube (17) by means of a respective rapid blocking pin (4) comprising a couple of through holes (14, 15) provided on a rod (13), and in that the clamp is fastened to the rapid blocking pin (4) by means of a couple of screws (16), the first one being introduced in said first through hole on the clamp and in a first through hole provided in said rod (13), and the second one being introduced in a hole selected between said plurality of circular through holes (2), whose centres are arranged along an arc of circle and in a second through hole provided on said rod (13).
5. Fastening means according to claim 4, characterized in that said pin (4) comprises coupling means configured to fasten removably said pin (4) coaxially to the second end of a respective side arm {11).
6. Fastening means according to claim 5, characterized in that said fastening means comprise a terminal thickening (5) of said pin (4) next to a groove (6) and an abutment disc (8) provided with a frustum of cone abutment surface (7).
7. Fastening means according to claim 6, characterized in that each side arm (17) comprises a coupling (9) configured to fasten and release said rapid coupling pin, so that the same is arranged coaxially to the second end of the respective arm (17).
8. Fastening means according to claim 7, characterized in that said couplings (9) are provided with an end provided with a beveled inner edge (12), with the bevel angle equal to the one of said frustum of cone abutment surface (7).
9. Fastening means according to claim 8, characterized in that each tubular coupling (9) is also provided with a through hole orthogonal to its own axis, inside which a tightening screw (22) with frustum of cone bit is screwed, configured to be introduced inside the groove (6) and to block the pin (4) inside the tubular coupling (9), with the conical portion in abutment on the beveled inner edge.
10. Fastening means according to claim 9, characterized in that said thickening (5) of each of said pins (4) is provided with a rounded bit
(5), configured to facilitate the introduction of the pins (4) in the tubular couplings (9).
11. Fastening means according to claim 9 or 10, characterized in that said tightening screws (22) are actuated by an electric motor.
EP21711017.0A 2020-01-30 2021-01-20 Universal attachment for an additional wheel for wheelchairs Pending EP4096609A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202020000000421U IT202000000421U1 (en) 2020-01-30 2020-01-30 UNIVERSAL ATTACHMENT FOR ADDITIONAL WHEEL FOR WHEELCHAIRS
PCT/IB2021/050397 WO2021152424A1 (en) 2020-01-30 2021-01-20 Universal attachment for an additional wheel for wheelchairs

Publications (1)

Publication Number Publication Date
EP4096609A1 true EP4096609A1 (en) 2022-12-07

Family

ID=74867570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21711017.0A Pending EP4096609A1 (en) 2020-01-30 2021-01-20 Universal attachment for an additional wheel for wheelchairs

Country Status (3)

Country Link
EP (1) EP4096609A1 (en)
IT (1) IT202000000421U1 (en)
WO (1) WO2021152424A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202006005105U1 (en) * 2006-03-30 2006-08-10 Frombach, Klaus, Dipl.-Ing.(FH) Front-end mobility hand-bike adapter for wheelchair is held by lever-operated clamp lock
EP2170238A4 (en) * 2007-06-27 2014-06-11 Daedalus Wings Inc Mounting assembly for attaching auxiliary equipment to a wheelchair
US7976049B2 (en) * 2009-11-05 2011-07-12 Wu's Tech Co., Ltd. Assembly and positioning mechanism for wheelchair and auxiliary operating lever
ITAN20130103A1 (en) * 2013-06-04 2014-12-05 Giovanni Conte REMOVABLE DEVICE FOR MOTORIZATION OF DISABLED WHEELCHAIRS.
ES2425316B1 (en) * 2013-07-08 2014-08-05 Batec Mobility, S.L. Auxiliary wheelchair mobility system
ITUB20156827A1 (en) * 2015-12-11 2017-06-11 Smdm Srl Soluzioni Mecc Domotiche Meccatroniche DEVICE FOR MOTORIZATION OF DISABLED WHEELCHAIRS
ITUA20162334A1 (en) * 2016-04-06 2017-10-06 Klaxon Mobility Gmbh CONNECTION GROUP FOR THE COMBINATION OF AN AUXILIARY TRACTION SYSTEM TO A DISABLED WHEELCHAIR
KR101978667B1 (en) * 2017-12-20 2019-05-21 주식회사 로보쓰리 The power unit of wheelchair for change electromotive run

Also Published As

Publication number Publication date
IT202000000421U1 (en) 2021-07-30
WO2021152424A1 (en) 2021-08-05

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