US20040220735A1 - Powered mobility vehicle collision damage prevention device - Google Patents
Powered mobility vehicle collision damage prevention device Download PDFInfo
- Publication number
- US20040220735A1 US20040220735A1 US10/834,692 US83469204A US2004220735A1 US 20040220735 A1 US20040220735 A1 US 20040220735A1 US 83469204 A US83469204 A US 83469204A US 2004220735 A1 US2004220735 A1 US 2004220735A1
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- US
- United States
- Prior art keywords
- mobility vehicle
- powered mobility
- powered
- damage prevention
- prevention device
- 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.)
- Abandoned
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Classifications
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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
- A61G5/04—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
- A61G5/04—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
- A61G5/043—Mid 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
- A61G5/10—Parts, details or accessories
-
- 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
- A61G5/1051—Arrangements for steering
-
- 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
- A61G2203/00—General characteristics of devices
- A61G2203/10—General characteristics of devices characterised by specific control means, e.g. for adjustment or steering
- A61G2203/14—Joysticks
-
- 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
- A61G2203/00—General characteristics of devices
- A61G2203/70—General characteristics of devices with special adaptations, e.g. for safety or comfort
- A61G2203/72—General characteristics of devices with special adaptations, e.g. for safety or comfort for collision prevention
- A61G2203/723—Impact absorbing means, e.g. bumpers or airbags
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S180/00—Motor vehicles
- Y10S180/907—Motorized wheelchairs
Abstract
A collision damage prevention system is disclosed which may be installed on many standard powered mobility vehicles for handicapped persons. The system includes an array of one or more sensors placed around the periphery of the powered mobility vehicle, a switch for each sensor, and a central control module which receives input from the switches, turns the vehicle off and/or applies braking power to prevent damage from a collision. The system then prompts the operator to acknowledge the collision and guides the operator into the appropriate direction to move the vehicle's controls in order to move away from the object collided with.
Description
- Reference is hereby made to provisional application No. 60/466,320, filed on Apr. 29, 2003, from which priority is hereby claimed pursuant to 35 U.S.C. § 120.
- Not Applicable.
- Not Applicable.
- This Invention relates to a device and method for preventing damage from collisions occurring during the operation of a powered wheelchair or similar mobility device. Powered wheelchairs and similar powered mobility devices are self-powered vehicles which are commonly used by handicapped individuals to give them mobility, most particularly within the confines of the individual's home or within businesses the individual visits. These vehicles have greatly enhanced the lives of those affected by disease, stroke, injury, or the ravages of aging; however, the typical user is often restricted in head movement, visual and auditory acuity, and other sensory perception (including vibration) such that it becomes impossible for the typical user to adequately observe the boundaries of the vehicle as the user maneuvers among furniture, around comers, and through doors of the home or business. It is very common for these vehicles to cause severe damage to their surroundings, even when maneuvered at very low speeds, because of the great power capabilities of these vehicles necessary to overcome slopes, door thresholds, and other obstacles in normal use. It is especially common for a person with hearing difficulties, upon colliding with a door frame or piece of furniture, to continue to apply power in the same direction, rather than to ease the mobility device away from the object. The result is that severe damage often results from these collisions, both to the object collided with as well as the vehicle, with deep scratches, gouges, and holes left in the former, or bent operating handles and other damage done to the latter. Problems are not limited to those with hearing difficulties, however; even for those who realize that a collision has occurred, the controls of common mobility devices are often counterintuitive regarding the direction the user needs to move to avoid damage. A need therefore exists for a system which will detect an impending collision between a handicapped mobility device and an object which will stop the mobility device from causing damage to the object, alert the user to the impending collision, and guide the user towards making appropriate course modifications to prevent damage to the mobility device and the object.
- The present Invention is therefore directed remedying these problems by providing a device and method for modifying an existing powered mobility device which, when installed on such a powered mobility device, will detect an impending collision, will prevent damage to the object collided with and will alert the user by stopping the vehicle and/or sounding an alarm, and will give the user guidance on the appropriate corrective action to take before the object is damaged.
- In accordance with the present Invention, a peripheral sensor system having a tape switch or bumper switch or similar device is attached to the outer periphery of the powered mobility device. The peripheral sensor system includes the tape switch, bumper switch, or similar switch as described, which is mounted to a sensor support framework, plus an electronic control module which interfaces with the power control of the powered mobility device on which the Invention is installed. The sensor support framework consists essentially of a bumper mounted to the vehicle by means of existing bolts and is made from spring steel or other resilient, damage resistant material. The electronic control module further includes a reset timer and an output panel with a series of light-emitting diodes or similar lighting devices. Upon contact with an object, the tape switch or bumper switch closes, energizing the electronic control module which then shuts down the vehicle, displays a light to alert the user that a collision has occurred, further displays a light to alert the user as to what corrective action needs to be taken to prevent damage, and starts the reset timer, which will automatically reset the system after a predetermined delay period.
- FIG. 1 shows a typical powered mobility vehicle in oblique view.
- FIG. 2 shows a top view of a typical powered mobility vehicle.
- FIG. 3 shows a top view of a typical mobility vehicle with the collision damage prevention system installed.
- FIG. 4 shows a rear view of a typical mobility vehicle with the collision damage prevention system installed.
- FIG. 5 shows a left side view of a typical mobility vehicle with the collision damage prevention system installed.
- FIG. 6 shows a conceptualization of the connections between major components of the collision damage prevention system.
- FIG. 7 shows a detailed cross-sectional view of the pneumatic sensors and sensor switches.
- FIG. 8 shows the preferred input/output user interface.
- FIGS. 1 and 2 show a typical powered
mobility vehicle 10. Such a vehicle has aseat 20,footrest 22, andarmrests 24 to accommodate the user. Mounted to one of thearmrests 24 is asteering control module 30 with which the user operates the vehicle. Theseat 20 andfootrest 22 are mounted to thebody 50, which houses the unit's battery and motor. The vehicle additionally has a plurality of wheels, typically a pair ofmain drive wheels 40, a pair ofrear steering wheels 42, and a set offorward wheels 44. The latter may or may not be utilized in steering the vehicle during its operation. - FIGS. 3, 4, and5 disclose a typical powered
mobility vehicle 10 with the collision damage prevention system 100 installed. Around the periphery of thevehicle 10, a sensor support framework 202 (made of spring steel or similar resilient, semiflexible material that is damage resistant) is mounted, to which a plurality of sensors 200 (preferably six) are installed. It will be understood that due to the nature of the modular design of thesensors 200, the number of sensors can be varied from as few as one to as many as needed. Thesesensors 200 may be tape or ribbon switches (which will be understood by those with ordinary skill in the art), but preferably comprise a pneumatic sensor and switch system described in further detail, infra. Referring to FIGS. 6, 7, and 8, each of thesensors 200 is connected to acentral control module 300, which is interfaced with the powered mobility vehicle's usersteering control module 30. Thecentral control module 300 includes electronic circuitry 310 for monitoring the status of thevarious sensors 200. Those of ordinary skill in the art will understand how to build the necessary circuitry to accomplish the tasks needed. Thecentral control module 300 also includes a user input/output interface 320 for communicating with the user of the poweredmobility vehicle 10. This user input/output interface 320 includes an on/off switch 322, which is backlit by an on/off switch light-emitting diode (LED) 324; areset switch 326, which is similarly backlit by a reset switch LED 328; acollision alarm LED 330; and a plurality of directional instruction LED's 332. The face of the input/output interface 320 further includes a number of preprinted instructions, particularly including preprinted instructions on the direction to move the steering apparatus of the poweredmobility vehicle 10 to correct for a collision. The directional instruction LED's 332 are arranged on the face of the input/output interface 320 around the periphery of a silhouette of the poweredmobility vehicle 10 such that onedirectional instruction LED 332 is associated with aparticular sensor 200; for example, in a system with a sensor on the left front of thevehicle 10, adirectional instruction LED 332 is included in the input/output interface 320. The on/offswitch 322 may be used to turn the collision damage prevention system 100 on and off independently from the poweredmobility vehicle 10. This is a safety feature that allows a user to override the system in the event of an emergency requiring a user to evacuate a building. When the system is on, the on/off switch LED 324 is also on, indicating to the user that there is power to the collision damage prevention system 100. - The preferred sensor in this arrangement is a pneumatic sensor, both due to cost and ease of use considerations. Referring particularly to FIG. 7, a
pneumatic sensor 400 consists of a formedrubber bumper 410 made from two superposed layers of rubber sealed at the edge by asensor end cap 412, which also serves to protect the edge of therubber bumper 410. The two layers of thepneumatic sensor 400 define apneumatic cavity 418. This assembly is mounted to thesensor support framework 202 by means of one or moreset screws 414 and ahollow set screw 416. Thehollow set screw 416 is simply a screw with a hole passing through the long axis of the screw, causing the two ends of the screw to be in fluid communication. Thehollow set screw 416 passes through one layer of therubber bumper 410. By this arrangement, thepneumatic cavity 418 is in fluid communication with a connectingtubing 430, which is connected at one end to thehollow set screw 416 an at the other end to apneumatic switch 420. Thepneumatic switch 420 includes a switch body 422, aswitch diaphragm 424, aswitch actuator plate 426, and acapillary tube 432. - In operation, when the
rubber bumper 410 contacts an object, the deformation of the bumper causes an increase in the air pressure within the bumper. This pressure is communicated through thehollow set screw 416 and connectingtubing 430 to theswitch diaphragm 424, depressing the diaphragm. As thediaphragm 424 is depressed, it operates upon theswitch actuator plate 426, thus tripping theswitch 420 and closing the circuit, which thus alerts thecentral control module 300 that a collision has occurred. Thecapillary tube 432 provides a route for a controlled release or leakage of air pressure from within thepneumatic sensor 400, thereby allowing the system to self-compensate for gradual variations in air pressure due to a variety of non-collision circumstances, including heating of the pneumatic sensor 400 (either due to exposure to sunlight or simply due to external temperature variations) as well as changes in the external barometric pressure. - After a collision has occurred, thereby operating the
pneumatic sensor 400 andpneumatic switch 420, thecentral control module 300 receives input from thepneumatic switch 420. Thecentral control module 300 then automatically switches thepowered mobility vehicle 10's power off and/or applies the vehicle's brakes to prevent collision damage from occurring. At the same time, the control module input/output interface displays a number of things: first, the reset switch LED 328 is lighted intermittently, causing it to blink on and off, and second, thedirectional instruction LED 332 corresponding to the sensor registering a collision is also intermittently lighted, causing it to blink on and off, thereby signifying that there is contact between the corresponding sensor and an object. The user must then press thereset switch 326 in order to restore power to thepowered mobility vehicle 10. Upon activating thereset switch 326, the reset switch LED 328 is turned off, power to thevehicle 10 is restored, and the unprotected ready-to-move LED 330 is lit, indicating to the user that the vehicle is ready to move with the shutdown system deactivated and that corrective action is needed as indicated by the appropriatedirectional information LED 332. Furthermore, upon activation of thereset switch 326, thecentral control module 300 starts an internal, adjustable timer which provides a delay period for the user to take corrective action as indicated by the input/output interface 320. At the end of the delay period, the system automatically resets itself, and the ready-to-move LED 330 and thedirectional information LED 332 both turn off. - It will be understood that the system100 is intended to be mounted to a
powered mobility vehicle 10 through the use of existing bolts as much as possible in order to minimize, and preferably to eliminate, any modifications to thevehicle 10. This is desirable so as to avoid voiding any warranties. Ideally, the only modification necessary is the addition of an electrical interface to the standard usersteering control module 30 to power thecentral control module 300. It will be further readily apparent that the particular input/output interface 320 as described, with the automatic reset timer, are designed to avoid operator confusion or frustration which would cause the operator to disable the system. - Those familiar with the art will understand the components of the invention, their methods of manufacture, and the methods of connecting them to form the complete Invention. While the preferred embodiment has been described, it will furthermore be understood that various changes can be made therein without departing from the spirit and scope of the invention.
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Claims (11)
1. A powered mobility vehicle collision damage prevention device comprising:
a. one or more sensor means for detecting contact or impending contact between a powered mobility vehicle and an object;
b. central control means connected to each of said sensor means for receiving input from said sensor means, wherein said central control means further comprises processor means for interpreting input from said sensor means and input/output means for communicating data to the user of said powered mobility vehicle.
2. The powered mobility vehicle collision damage prevention device of claim 1 , wherein said sensor means further comprises a tape switch.
3. The powered mobility vehicle collision damage prevention device of claim 1 , wherein said sensor means further comprises a ribbon switch.
4. The powered mobility vehicle collision damage prevention device of claim 1 , wherein said each of said sensor means further comprises a pneumatic sensor comprising a rubber bladder filled with air, with each of said pneumatic sensors being in fluid communication with a pneumatically operated switch further comprising a switch body having a pressure inlet and a pressure bleed, a diaphragm, and an actuator plate, wherein said diaphragm is located within said switch body between said pressure inlet and said actuator plate and wherein said diaphragm is free to move against said actuator plate in response to air pressure entering said pressure inlet, and wherein said pressure bleed is located on the same side of said diaphragm as said pressure inlet, with said pressure bleed connected to and in fluid communication with one end of a capillary outlet tube, with the other end of said capillary outlet tube being open to the surrounding atmosphere.
5. The powered mobility vehicle collision damage prevention device of claim 1 wherein said sensor means are connected to said powered mobility vehicle by means of a spring steel bumper attached to the periphery of said powered mobility vehicle.
6. The powered mobility vehicle collision damage prevention device of claim 2 wherein said tape switches are connected to said powered mobility vehicle by means of a spring steel bumper attached to the periphery of said powered mobility vehicle.
7. The powered mobility vehicle collision damage prevention device of claim 3 wherein said ribbon switches are connected to said powered mobility vehicle by means of a spring steel bumper attached to the periphery of said powered mobility vehicle.
8. The powered mobility vehicle collision damage prevention device of claim 4 wherein said pneumatic sensors are connected to said powered mobility vehicle by means of a spring steel bumper attached to the periphery of said powered mobility vehicle.
9. The powered mobility vehicle collision damage prevention device of any of claims 1-8, wherein said central control module further comprises a reset timer, wherein said reset timer begins to run upon a collision between said powered mobility vehicle and said object, and wherein the length of time during which the reset timer runs may be adjusted, and wherein said central control module is reset when said reset timer reaches the end of said length of time.
10. The powered mobility vehicle collision damage prevention device of claim 9 , wherein said input/output means further comprises a display panel having a reset switch, a power switch, a ready-to-move light, and one or more directional information lights, with each of said directional information lights corresponding to one of said sensor means, and wherein said display panel further shows a display of said powered mobility vehicle, with said directional information lights placed on the display panel around the display of said powered mobility device, wherein each of said directional information lights is placed around said display of said powered mobility device in a location approximately corresponding to the physical location of each of said directional information light's corresponding sensor means, and wherein said power switch will turn said powered mobility vehicle collision damage prevention device off without affecting normal operation of said powered mobility vehicle.
11. A method for preventing damage resulting from a collision between a powered mobility vehicle and an object comprising:
a. detecting said collision;
b. stopping said powered mobility vehicle using shutdown means;
c. displaying information about said collision on a user interface, wherein said information comprises the fact that said collision has occurred and the location of said collision;
d. prompting the user of said powered mobility vehicle to move said powered mobility vehicle away from said object; and
e. displaying directions on how to move said powered mobility vehicle away from said object to said user on said user interface; and
f. automatically resetting said shutdown means after a preset time interval.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/834,692 US20040220735A1 (en) | 2003-04-29 | 2004-04-29 | Powered mobility vehicle collision damage prevention device |
US11/637,434 US7369943B2 (en) | 2003-04-29 | 2006-12-12 | Powered mobility vehicle collision damage prevention device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US46632003P | 2003-04-29 | 2003-04-29 | |
US10/834,692 US20040220735A1 (en) | 2003-04-29 | 2004-04-29 | Powered mobility vehicle collision damage prevention device |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/637,434 Division US7369943B2 (en) | 2003-04-29 | 2006-12-12 | Powered mobility vehicle collision damage prevention device |
Publications (1)
Publication Number | Publication Date |
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US20040220735A1 true US20040220735A1 (en) | 2004-11-04 |
Family
ID=33313535
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/834,692 Abandoned US20040220735A1 (en) | 2003-04-29 | 2004-04-29 | Powered mobility vehicle collision damage prevention device |
US11/637,434 Expired - Fee Related US7369943B2 (en) | 2003-04-29 | 2006-12-12 | Powered mobility vehicle collision damage prevention device |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/637,434 Expired - Fee Related US7369943B2 (en) | 2003-04-29 | 2006-12-12 | Powered mobility vehicle collision damage prevention device |
Country Status (1)
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US (2) | US20040220735A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070093963A1 (en) * | 2003-04-29 | 2007-04-26 | Adams Don L | Powered mobility vehicle collision damage prevention device |
WO2009141461A1 (en) | 2008-05-23 | 2009-11-26 | Fundacion Fatronik | Wheelchair and method for correcting the guidance of a wheelchair |
US20100082182A1 (en) * | 2008-09-09 | 2010-04-01 | Toronto Rehabilitation Institute | Powered wheelchair |
US20130140782A1 (en) * | 2011-11-27 | 2013-06-06 | Stryker Corporation | Wheeled chair |
IT202000000949A1 (en) * | 2020-01-20 | 2020-04-20 | Cornacchia Saverio | "SELF-PROPELLED PLATFORM SYSTEM FOR ARMCHAIR" |
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US20080300777A1 (en) * | 2002-07-02 | 2008-12-04 | Linda Fehr | Computer-controlled power wheelchair navigation system |
US7896394B2 (en) | 2005-08-18 | 2011-03-01 | Sunrise Medical Hhg, Inc. | Midwheel drive wheelchair with independent front and rear suspension |
US8851213B1 (en) * | 2009-12-24 | 2014-10-07 | Bryan Bradley Jones | Powered wheel chair with automatic emergency stopping |
US8851214B2 (en) | 2010-07-15 | 2014-10-07 | Permobil Ab | Electric mid-wheel drive wheelchair |
US9230419B2 (en) | 2010-07-27 | 2016-01-05 | Rite-Hite Holding Corporation | Methods and apparatus to detect and warn proximate entities of interest |
US9333880B2 (en) * | 2013-03-15 | 2016-05-10 | Lear Corporation | System and method for controlling vehicle seat movement |
CN106038114A (en) * | 2016-06-28 | 2016-10-26 | 秦军秀 | Wheelchair armrests provided with GPS satellite positioning navigators |
DE102016221365A1 (en) | 2016-10-28 | 2018-05-03 | Ford Global Technologies, Llc | Method and apparatus for automatically maneuvering a wheelchair relative to a vehicle |
US11911678B2 (en) * | 2019-07-16 | 2024-02-27 | Blaise Anthony Ignagni | Apparatus for playing and supporting a user during a game |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070093963A1 (en) * | 2003-04-29 | 2007-04-26 | Adams Don L | Powered mobility vehicle collision damage prevention device |
US7369943B2 (en) * | 2003-04-29 | 2008-05-06 | Adams Don L | Powered mobility vehicle collision damage prevention device |
WO2009141461A1 (en) | 2008-05-23 | 2009-11-26 | Fundacion Fatronik | Wheelchair and method for correcting the guidance of a wheelchair |
US20110130940A1 (en) * | 2008-05-23 | 2011-06-02 | Foundacion Fatronik | Wheelchair and method for correcting the guidance of a wheelchair |
US20100082182A1 (en) * | 2008-09-09 | 2010-04-01 | Toronto Rehabilitation Institute | Powered wheelchair |
US8280561B2 (en) | 2008-09-09 | 2012-10-02 | University Health Network | Powered wheelchair |
US20130140782A1 (en) * | 2011-11-27 | 2013-06-06 | Stryker Corporation | Wheeled chair |
US9084710B2 (en) * | 2011-11-27 | 2015-07-21 | Stryker Croporation | Wheeled chair |
IT202000000949A1 (en) * | 2020-01-20 | 2020-04-20 | Cornacchia Saverio | "SELF-PROPELLED PLATFORM SYSTEM FOR ARMCHAIR" |
Also Published As
Publication number | Publication date |
---|---|
US7369943B2 (en) | 2008-05-06 |
US20070093963A1 (en) | 2007-04-26 |
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