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WO2019030778A1 - Ensemble fauteuil roulant électrique conçu pour être manœuvré sur un terrain inégal - Google Patents

Ensemble fauteuil roulant électrique conçu pour être manœuvré sur un terrain inégal Download PDF

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Publication number
WO2019030778A1
WO2019030778A1 PCT/IN2018/050526 IN2018050526W WO2019030778A1 WO 2019030778 A1 WO2019030778 A1 WO 2019030778A1 IN 2018050526 W IN2018050526 W IN 2018050526W WO 2019030778 A1 WO2019030778 A1 WO 2019030778A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric wheelchair
driving wheel
front driving
wheelchair assembly
motor
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.)
Ceased
Application number
PCT/IN2018/050526
Other languages
English (en)
Inventor
Dhruv Chaudhry
Santosh Kocherlakota
Abhishek Narvekar
Rhugved Rane
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.)
Indent Designs Private Ltd
Original Assignee
Indent Designs Private Ltd
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 Indent Designs Private Ltd filed Critical Indent Designs Private Ltd
Publication of WO2019030778A1 publication Critical patent/WO2019030778A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • A61G5/041—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs motor-driven having a specific drive-type
    • A61G5/042—Front wheel drive
    • 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

Definitions

  • the embodiments herein generally relate to electric wheelchairs, and more particularly, an affordable electric wheelchair assembly that increases the stability and maneuverability while riding even in undulated terrain surfaces.
  • Wheelchairs and similar conveyances remain a critical part to allowing mobility for individuals with injuries or medical conditions that otherwise prevent them from walking or make walking more difficult. While many standard wheelchair designs that have small front wheels (e.g. castor wheels) to perform adequately on even surfaces, they are not suited for usage on uneven surfaces. There are more sophisticated wheelchairs that are adapted for rough terrain, however these are highly expensive, require high maintenance costs and not easy to store and transport. Further, spare parts for most standard wheelchairs are not readily available in local areas, which restrict mobility of the individuals with injuries or disabilities for a certain period of time till they are serviced or repaired. Existing wheelchairs also do not provide portability and volume reduction, which enables the wheelchairs to be stored in a vehicle, for example.
  • an electric wheelchair assembly includes a first front driving wheel, a second front driving wheel, a first hub, a second hub, a first motor, a second motor, and a control unit.
  • the first front driving wheel is attached to a left side of the electric wheelchair assembly and the second front driving wheel is attached to a right side of the electric wheelchair assembly.
  • the first hub is adapted to integrate the first front driving wheel with a first chain ring and the second hub is adapted to integrate the second front driving wheel with a second chain ring.
  • the first chain ring and the second chain ring houses a first bearing and a second bearing, where the first bearing is fitted with a first axle, and the second bearing is fitted with a second axle.
  • the first motor is adapted to operate the first front driving wheel and a second motor is adapted to operate the second front driving wheel in an alternate rotation.
  • the first motor is coupled with the first front driving wheel using a first chain drive to provide an independent rotation to the first front driving wheel and the second motor is coupled with the second front driving wheel using a second chain drive to provide the independent rotation to the second front driving wheel.
  • the control unit includes a joystick, microcontroller, and one or more power MOSFETs.
  • the joystick is adapted to obtain an input from the user and transmit a signal to a microcontroller.
  • the microcontroller is adapted to transmit a control signal to one or more power MOSFETs based on the signal received from the joystick.
  • the one or more power MOSFETs is adapted to operate the electric wheelchair assembly corresponding to the control signal received from the microcontroller.
  • the electric wheelchair assembly is constructed using the bicycle components that are readily available to enhance the affordability of the electric wheelchair assembly.
  • the electric wheelchair assembly includes foldable components to provide volume reduction in order to store it in a vehicle.
  • the electric wheelchair assembly is adapted to manoeuver effectively even in undulated terrains.
  • FIG. 1 illustrates an isometric view of an electric wheelchair assembly according to an embodiment herein;
  • FIG. 2 illustrates a top view of the electric wheelchair assembly according to an embodiment herein;
  • FIG. 3 illustrates a side view of the electric wheelchair assembly according to an embodiment herein;
  • FIG. 4 illustrates a front view of the electric wheelchair assembly according to an embodiment herein;
  • FIG. 5 illustrates an exploded view of a control unit of the electric wheelchair assembly according to an embodiment herein;
  • FIGS. 6A-6B illustrate exploded views of a rear castor wheel of the electric wheelchair assembly according to an embodiment herein;
  • FIG. 6C illustrates a cross sectional view of the rear castor wheel of the electric wheelchair assembly according to an embodiment herein.
  • FIG. 7 illustrates a method for manoeuvering the electric wheelchair assembly according to an embodiment herein.
  • FIG. 1 illustrates an isometric view of an electric wheelchair assembly according to an embodiment herein.
  • the electric wheelchair assembly includes a first front driving wheel 102A, a second front driving wheel 102B, a rear castor wheel 104, a first chain drive, a second chain drive, a first hub 106A, a second hub 106B, a frame 108, a first motor 110A, a second motor 110B, a first customized axle, a second customized axle, a battery 112, a first bearing 116A (not shown in FIG. 1), a second bearing 116B and a control unit.
  • the first front driving wheel 102A is attached to a left side of the electric wheelchair assembly and the second front driving wheel 102B is attached to a right side of the electric wheelchair assembly.
  • the one or more front driving wheels are attached to a front end of the electric wheelchair assembly.
  • the first front driving wheel 102A is coupled to the first motor 11 OA using the first chain drive to provide an independent rotation to the first front driving wheel 102 A.
  • the second front driving wheel 102B is coupled to the second motor 110B using the second chain drive to provide the independent rotation to the second front driving wheel 102B.
  • the first chain drive includes a first chain 118A (not shown in FIG. 1) and a first chain ring 120A.
  • the second chain drive includes a second chain 118B and a second chain ring 120B.
  • the first motor 110A and the second motor 110B operate the first front driving wheel 102 A and the second front driving wheel 102B respectively in both forward rotation and reverse rotation independently.
  • the first front driving wheel 102A and the second front driving wheel 102B are operated in an alternate rotation (i.e. opposite direction) using the first motor 110A and the second motor HOB respectively to achieve zero turn radius.
  • the first motor 11 OA includes a first small gear that is adapted to couple the first motor 110A to the first chain ring 120 A.
  • the second motor HOB includes a second small gear that is adapted to couple the second motor HOB to the second chain ring 120B.
  • the first chain ring 120A and the second chain ring 120B are larger in size (i.e. includes more number of teeth) compared to the first small gear and the second small gear respectively to obtain optimal torque by means of gear reduction.
  • the first motor 11 OA and the second motor HOB are positioned using one or more base plates to keep lengths of the first chain 118A and the second chain 118B in equal.
  • the arrangement of the first motor 110A and the second motor 110B using the one or more base plates reduces dragging in the first front driving wheel 102A and the second front driving wheel 102B respectively.
  • the one or more base plates include one or more adjustable mechanical slits or grooves that are used to provide ideal tolerances to the first motor 110A and the second motor 110B and the first chain drive and the second chain drive.
  • the first front driving wheel 102 A and the second front driving wheel 102B are large in size compared to the size of the rear castor wheel 104.
  • the large size (i.e. an optimized tyre size) of the first front driving wheel 102 A and the second front driving wheel 102B and the gear reduction facilitates the electric wheelchair assembly to operate with stability and ease while travelling even in undulated terrain surfaces.
  • the first motor 11 OA and the second motor HOB are permanent magnet DC motors (PMDC) with a gear reduction.
  • the rear castor wheel 104 is attached to a rear end of the electric wheelchair assembly. The zero turn radius is achieved by providing the alternate rotation in the first front driving wheel 102 A and the second front driving wheel 102B. The zero turn radius is further achieved by the rear castor wheel 104 in turning the electric wheelchair assembly.
  • the frame 108 includes a foldable swing arm 114, a removable backrest 122, a first foldable armrest 124A, a second foldable armrest 124B, a first foldable footrest 126 A and a second foldable footrest 126B.
  • the first foldable armrest 124 A and the second foldable armrest 124B are adapted to fold from an initial armrest position to a folded armrest position.
  • the foldable footrest 126A and the second foldable footrest 126B are adapted to fold from an initial footrest position to a folded footrest position to provide volume reduction when folding the electric wheelchair assembly.
  • the battery 112 is a valve -regulated lead acid (VRLA) battery.
  • the battery 112 may be any type of battery that is suitable and/or adapted to operate with the electric wheelchair assembly.
  • the electric wheelchair assembly further includes a suspension mechanism 128, seat plate and an ergonomic seat.
  • the suspension mechanism 128 is adapted to operate the electric wheelchair assembly with comfort when travelling in the undulated terrain surfaces.
  • the suspension mechanism 128 may be quickly released from an initial position so that the foldable swing arm 114 along with the rear castor wheel 104 rotates around and gets folded under the space of the battery 112 to provide volume reduction.
  • the volume reduction may provide portability to store the electric wheelchair assembly in a vehicle while transporting.
  • the first hub 106A and the second hub 106B are used to integrate the first front driving wheel 102A and the second front driving wheel 102B with the first chain ring 120 A and the second chain ring 120B respectively.
  • the first chain ring 120 A and the second chain ring 120B house the first bearing 116A and the second bearing 116B respectively.
  • the first customized axle and the second customized axle may be a snug fit in the first bearing 116A and the second bearing 116B respectively.
  • the control unit controls the electric wheelchair assembly based on inputs received from a user.
  • FIG. 2 illustrates a top view of the electric wheelchair assembly according to an embodiment herein.
  • the electric wheelchair assembly includes the first front driving wheel 102A, the second front driving wheel 102B, the rear castor wheel 104, the first chain drive, the second chain drive, the frame 108, the first motor 110A, the second motor HOB, the foldable swing arm 114, the removable backrest 122, the first foldable armrest 124A, the second foldable armrest 124B, the first foldable footrest 126 A, the second foldable footrest 126B and the suspension mechanism 128.
  • the function of these components as has been described above.
  • FIG. 3 illustrates a side view of the electric wheelchair assembly according to an embodiment herein.
  • the electric wheelchair assembly includes the second front driving wheel 102B, the rear castor wheel 104, the second chain drive, the frame 108, the second motor 110B, the first customized axle, the second customized axle, the foldable swing arm 114, the second chain 118B, the second chain ring 120B, the removable backrest 122, the second foldable armrest 124B, the second foldable footrest 126B and the suspension mechanism 128.
  • the first customized axle includes the first hub 106 A with a first standard axle.
  • the second customized axle includes the second hub 106B axle with a second standard axle. The function of the other components as has been described above.
  • FIG. 4 illustrates a front view of the electric wheelchair assembly according to an embodiment herein.
  • the electric wheelchair assembly includes the first front driving wheel 102A, the second front driving wheel 102B, the rear castor wheel 104, the first chain drive, the second chain drive, the frame 108, the first motor 110A, the second motor HOB, the battery 112, the foldable swing arm 114, the removable backrest 122, the first foldable armrest 124A, the second foldable armrest 124B, the first foldable footrest 126 A and the second foldable footrest 126B.
  • the function of these components as has been described above.
  • FIG. 5 illustrates an exploded view of the control unit 504 of the electric wheelchair assembly according to an embodiment herein.
  • the control unit 504 includes a joystick 506, a microcontroller 508 and one or more power MOSFETs 510A-N.
  • the joystick 506 (i) obtains input from the user 502 and (ii) transmits a signal to the microcontroller 508.
  • the joystick 506 is an IP54 rated joystick.
  • the IP54 rated joystick is both dust resistant and splash resistant.
  • the joystick 506 is operated by the user 502.
  • the joystick 506 may be any type of joystick that is suitable and/or adapted to operate with the electric wheelchair assembly.
  • the microcontroller 508 transmits a control signal to the one or more power MOSFETs 510A-N based on the signal received from the joystick 506.
  • the one or more power MOSFETs 510A-N operates the electric wheelchair assembly corresponding to the control signal received from the microcontroller 508.
  • the one or more power MOSFETs 510A-N are further used to deliver power to the first motor 110A from the battery 112 and the second motor 110B in a controlled manner.
  • the electric wheelchair assembly further includes an accelerometer and a gyroscope that assists the control unit 504 to achieve a hill hold assist and a traction control.
  • the hill hold assist and the traction control are obtained by applying reverse power to the first motor 11 OA and the second motor 110B in opposite to the direction of a slope to keep the electric wheelchair assembly in stationary position.
  • the hill hold assist and the traction control restricts the electric wheelchair assembly from sloping under gravitational force and provides sufficient time to the user 502 to operate (e.g. turn) the electric wheelchair assembly in the desired direction.
  • FIGS. 6A-6B illustrate exploded views of the rear castor wheel 104 of the electric wheelchair assembly according to an embodiment herein.
  • the rear castor wheel 104 is adapted to operate the electric wheelchair assembly in a front or a back direction by applying a force which is supplied by the first motor 110A and the second motor HOB in either of the first front driving wheel 102 A or the second front driving wheel 102B.
  • the rear castor wheel 104 is characterized by a castor biasing assembly 602 comprises a stem, a bearing set, a fork assembly 604 and a spring plunger 612.
  • the stem is coupled with a groove.
  • a hole 608 emended on the stem and the spring plunger 612 is inserted into the hole 608.
  • FIG. 6C illustrates a cross sectional view of the rear castor wheel 104 of the electric wheelchair assembly according to an embodiment herein.
  • the the rear castor wheel 104 is characterized by a castor biasing assembly 602 comprises a stem, a bearing set, a fork assembly 604 and a spring plunger 612.
  • FIG. 7 illustrates a method for manoeuvring the electric wheelchair assembly according to an embodiment herein.
  • the first chain ring 120A and the second chain ring 120B houses a first bearing 116A and a second bearing 116B, where the first bearing 116A is fitted with a first axle, and the second bearing 116B is fitted with a second axle.
  • operating is adapted to the first front driving wheel 102 A using a first motor 110A and the second front driving wheel 102B using a second motor 110B in an alternate rotation.
  • the control unit 502 includes a joystick 506, a microcontroller 508, and one or more power MOSFETs 510A-N.
  • the joystick 506 is adapted to obtain an input from the user 502 and transmit a signal to the microcontroller 508.
  • the microcontroller 508 is adapted to transmit a control signal to one or more power MOSFETs 510A-N based on the signal received from the joystick 506,
  • the one or more power MOSFETs 510A-N is adapted to operate the electric wheelchair assembly corresponding to the control signal received from the microcontroller 508.

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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)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

L'invention concerne un ensemble fauteuil roulant électrique. L'ensemble fauteuil roulant électrique comprend une première roue motrice avant (102A), une seconde roue motrice avant (102B), un premier moyeu (106A) et un second moyeu (106B), un premier moteur (110A) et une unité de commande (504). La première roue motrice avant (102A) est fixée à un côté gauche de l'ensemble fauteuil roulant électrique et la seconde roue motrice avant (102B) est fixée à un côté droit de l'ensemble fauteuil roulant électrique. Le premier moyeu (106A) est conçu pour intégrer la première roue motrice avant (102A) avec un premier plateau (120A) et le second moyeu (106B) est conçu pour intégrer la seconde roue motrice avant (102B) avec un second plateau (120B). Le premier moteur (110A) est conçu pour faire fonctionner la première roue motrice avant (102A) et un second moteur (110B) est conçu pour faire fonctionner la seconde roue motrice avant (102B) dans une autre rotation.
PCT/IN2018/050526 2017-08-11 2018-08-11 Ensemble fauteuil roulant électrique conçu pour être manœuvré sur un terrain inégal Ceased WO2019030778A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN201721028708 2017-08-11
IN201721028708 2017-08-11

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Publication Number Publication Date
WO2019030778A1 true WO2019030778A1 (fr) 2019-02-14

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PCT/IN2018/050526 Ceased WO2019030778A1 (fr) 2017-08-11 2018-08-11 Ensemble fauteuil roulant électrique conçu pour être manœuvré sur un terrain inégal

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4112029A1 (fr) 2021-06-30 2023-01-04 COSMOTECH Sp. z o.o. Module d'entraînement sans moyeu et fauteuil roulant électrique utilisant un tel module

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5145197A (en) * 1987-09-14 1992-09-08 Contemporary Medical Equipment Corp. Folding wheelchair with rigid seat
CA2333886A1 (fr) * 1999-07-30 2001-02-08 Invacare Corporation Ensemble stabilisateur pour fauteuil roulant
WO2007120099A1 (fr) * 2006-04-13 2007-10-25 Permobil Ab Dispositif de commande a tablette permettant de commander un fauteuil roulant
EP1917947A2 (fr) * 2006-11-06 2008-05-07 Sunrise Medical GmbH & Co. KG Véhicule de mobilité personnelle à roues arrières pivotantes et procédé de déplacement d'une roue arrière pivotante
WO2015165496A1 (fr) * 2014-04-29 2015-11-05 Reac Ab Fauteuil roulant motorisé

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5145197A (en) * 1987-09-14 1992-09-08 Contemporary Medical Equipment Corp. Folding wheelchair with rigid seat
CA2333886A1 (fr) * 1999-07-30 2001-02-08 Invacare Corporation Ensemble stabilisateur pour fauteuil roulant
WO2007120099A1 (fr) * 2006-04-13 2007-10-25 Permobil Ab Dispositif de commande a tablette permettant de commander un fauteuil roulant
EP1917947A2 (fr) * 2006-11-06 2008-05-07 Sunrise Medical GmbH & Co. KG Véhicule de mobilité personnelle à roues arrières pivotantes et procédé de déplacement d'une roue arrière pivotante
WO2015165496A1 (fr) * 2014-04-29 2015-11-05 Reac Ab Fauteuil roulant motorisé

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4112029A1 (fr) 2021-06-30 2023-01-04 COSMOTECH Sp. z o.o. Module d'entraînement sans moyeu et fauteuil roulant électrique utilisant un tel module

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