WO2023177987A1 - Assistance électrique universelle pour fauteuil roulant - Google Patents

Assistance électrique universelle pour fauteuil roulant Download PDF

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Publication number
WO2023177987A1
WO2023177987A1 PCT/US2023/063749 US2023063749W WO2023177987A1 WO 2023177987 A1 WO2023177987 A1 WO 2023177987A1 US 2023063749 W US2023063749 W US 2023063749W WO 2023177987 A1 WO2023177987 A1 WO 2023177987A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheelchair
friction roller
engagement
wheel
engagement member
Prior art date
Application number
PCT/US2023/063749
Other languages
English (en)
Inventor
Roger Baumann
Evan Peskin
Vivek Nagar
Audrey Wilson
Jonathan Slavin
Original Assignee
Roda Futura, Llc
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
Priority claimed from US17/696,842 external-priority patent/US11523951B2/en
Priority claimed from US17/984,077 external-priority patent/US11660241B2/en
Application filed by Roda Futura, Llc filed Critical Roda Futura, Llc
Publication of WO2023177987A1 publication Critical patent/WO2023177987A1/fr

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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

Definitions

  • the present application generally relates to a removable power assist for a manual wheelchair, and more particularly relates to a device for converting a manual wheelchair into an electric wheelchair.
  • What is needed is a device for converting a manual wheelchair into a power driven system in a cost effective, portable, easy to install and use, lightweight, alternately convertible from electric to manual without uninstalling the device.
  • the device should be adaptable to existing manual wheelchairs without the need of professional installation.
  • a wheelchair power assist device configured to be installed, uninstalled or exchanged independently from a wheelchair.
  • the device may switch a motorized friction roller between engaged and disengaged modes with a wheelchair wheel, based on an engagement actuator configured to move the friction roller relative to the wheelchair.
  • a tab connection may permit securing or exchanging the device independent of the wheelchair.
  • the friction roller may be operably coupled with an engagement member configured to move relative to the wheelchair.
  • the engagement member may be moved by an extendable and retractable actuator shaft coupled with the wheelchair.
  • a manual wheelchair may be converted to a powered wheelchair using a motorized friction roller for each wheelchair wheel while leaving an open space behind the wheelchair seating area, advantageously permitting the power assist devices to remain attached to a foldable wheelchair in folded or unfolded configurations.
  • FIG. 1 illustrates a block diagram of an exemplary device in accordance with an embodiment of the present invention.
  • FIGs. 2A-2E illustrate side views of an exemplary power assist device attached to a manual wheelchair in accordance with exemplary embodiments of the present invention.
  • FIG. 3 illustrates a top perspective view of an exemplary device implementation attached to the manual wheelchair in accordance with an embodiment of the present invention.
  • FIG. 4 illustrates a perspective view of an exemplary engagement unit in accordance with another embodiment of the present invention.
  • FIG. 5 illustrates a perspective view of the device in accordance with another embodiment of the present invention.
  • FIG. 6 illustrates a perspective view of the device with a protective fender in accordance with another embodiment of the present invention.
  • FIG. 8 illustrates a side view of an exemplary wheelchair power assist device operation unit assembly in an exemplary retracted configuration.
  • FIG. 9 illustrates a top perspective view of an exemplary wheelchair with two illustrative power assist devices each configured to drive one of the two depicted wheelchair mam wheels.
  • FIG. 10A illustrates a rear perspective view of an exemplary wheelchair with two illustrative power assist devices each configured to drive one of the two depicted wheelchair main wheels, with the wheelchair in an exemplary unfolded configuration.
  • FIG. 10B illustrates a rear perspective view of an exemplary wheelchair with two illustrative power assist devices each configured to drive one of the two depicted wheelchair main wheels, with the wheelchair in an exemplary folded configuration.
  • FIGs. 11A-11D illustrate perspective views of an exemplary engagement unit configured in exemplary disengaged and engaged modes.
  • FIGs. 12A-12C illustrate perspective views of exemplary engagement unit component implementations.
  • FIGs. 13A-13D depict perspective views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIGs. 14A-14B depict outside and inside views of an exemplary engagement and attachment implementation in an exemplary extended mode.
  • FIGs. 15A-15B depict side views of an exemplary engagement and attachment implementation in exemplary disengaged and engaged modes.
  • FIGs. 16A-16B depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIGs. 18A-18C depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIGs. 19A-19B depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIGs. 20A-20C depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIGs. 21A-21D depict various views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIG. 22 depicts an exemplary front detail view of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIG. 23A depicts a top perspective view of an exemplary exchange tab.
  • FIG. 23B depicts a side perspective view of an exemplary exchange tab.
  • FIG. 23C depicts a side perspective view of an exemplary exchange tab.
  • FIG. 23D depicts a front perspective view of an exemplary exchange actuator arrangement.
  • FIG. 23E depicts a side view of an exemplary exchange actuator arrangement.
  • FIG. 24 depicts an exemplary wheelchair viewed from a right rear perspective.
  • FIG. 25 depicts an exemplary wheelchair viewed from a right rear perspective.
  • FIG. 26 depicts a partial exploded view of an exemplary wheelchair from a left rear perspective.
  • FIG. 27 depicts an exemplary wheelchair viewed from a top left side perspective.
  • FIG. 28 depicts an exemplary wheelchair viewed from a left side perspective.
  • FIG. 29 depicts an exemplary wheelchair viewed from a left rear top perspective.
  • FIG. 30 depicts an exemplary wheelchair viewed from a left side perspective.
  • FIG. 1 illustrates a block diagram of the device 100 in accordance with one embodiment of the present invention.
  • the device 100 includes a joystick 102, a retractable friction roller 104, an engagement unit 106 and a power source 108.
  • the joystick 102 is operably connected to a communication unit 110.
  • the joystick 102 is explained in detail in conjunction with FIGs. 2A-2E and FIG. 3 of the present invention.
  • the communication unit 110 is operably connected to a motor 112.
  • the communication unit 110 is explained in detail in conjunction with FIGs. 2A-2E of the present invention.
  • the motor 112 includes an axle 114 and a rotor 116.
  • the motor 112 is explained in detail in conjunction with FIG. 3 of the present invention.
  • the axle 114 is shown and explained in detail in conjunction with FIG. 4 of the present invention.
  • the retractable friction roller 104 is mounted on the axle 114. During operation of the device 100, the retractable friction roller 104 is put in contact with at least one wheel 206 (shown in FIGs. 2A-2E) of a manual wheelchair 202 (shown in FIGs. 2A-2E).
  • the retractable friction roller 104 is explained in detail in conjunction with FIG. 3 and FIG. 4 of the invention.
  • the engagement unit 106 is attached to the wheelchair 202 (shown in FIGs. 2A-2E) to detachably attach the retractable friction roller 104 and the wheel (shown in FIGs. 2A-2E).
  • the engagement unit 106 is explained in detail in conjunction with FIG. 3, FIG. 4 and FIG. 5 of the present invention.
  • the power source 108 is operably connected to the motor 112 and the joystick 102.
  • the power source 108 is shown and explained in detail in conjunction with FIG.
  • FIG. 2A illustrates a side view of one embodiment of device 100 attached to a manual wheelchair 202.
  • the joystick 102 allows the user to control the direction and speed of the motor 112 (shown at least in FIGs. 1, 3, 11 A, and 11B).
  • the joystick 102 is attached to an arm 204 of the manual wheelchair 202.
  • a user is able to control the direction, movement and speed of the device 100 using the joystick 102. More specifically, the movement and speed of the wheel 206 of the wheelchair 202 is controlled by user instructions using the joystick 102 and the communication unit 110 (shown in FIG. 3).
  • the exemplary power assist device 100 includes a friction roller configured to drive when engaged the wheel 206.
  • the friction roller is further described with reference to at least FIGs. 3, 5-6, 7 A, 9, 10A-B, and 11A-D.
  • the power assist device 100 is attached to the wheelchair 202 above the wheel 206 center and behind the wheelchair 202 seating area.
  • the friction roller is configured to drive when engaged the wheel 206 through a friction roller contact surface with the wheel 206 that is above the wheel 206 center and behind the wheelchair 202 seating area. As described in further detail with reference to at least FIGs.
  • configuring the friction roller to contact the wheel 206 above the wheel 206 center and behind the wheelchair 202 seating area may leave open the space behind the wheelchair 202 seating area, permiting the power assist device 100 installation and removal from behind the wheelchair 202 while the wheelchair 202 seat is occupied by a person riding in the wheelchair 202. Leaving open the space behind the wheelchair 202 seating area as a result of configuring the friction roller to contact the wheel 206 above the wheel 206 center and behind the wheelchair 202 seating area may permit folding and unfolding the wheelchair 202 without uninstalling the power assist device 100.
  • the exemplary power assist device 100 includes a friction roller configured to drive when engaged the wheel 206.
  • the power assist device 100 is atached to the upper lateral wheelchair frame support 208, to position the power assist device 100 in front of the wheel 206 and to the side of the wheelchair 202 seating area.
  • the exemplary wheelchair 202 depicted by FIG. 2B also includes the lower lateral wheelchair frame support 210, the vertical wheelchair frame support 212, and arms 204.
  • the exemplary power assist device 100 includes a friction roller configured to drive when engaged the wheel 206.
  • the power assist device 100 is atached to the lower lateral wheelchair frame support 210, to position the power assist device 100 in front of the wheel 206 and to the side of the wheelchair 202 seating area.
  • the exemplary wheelchair 202 depicted by FIG. 2C also includes the upper lateral wheelchair frame support 208, the vertical wheelchair frame support 212, and arms 204.
  • the exemplary power assist device 100 includes a friction roller configured to drive when engaged the wheel 206.
  • the power assist device 100 is atached by power assist bracket 211 to the vertical wheelchair frame support 212, to position the power assist device 100 in front of the wheel 206 and to the side of the wheelchair 202 seating area.
  • the exemplary wheelchair 202 depicted by FIG. 2D also includes the upper lateral wheelchair frame support 208, the lower lateral wheelchair frame support 210, and arms 204.
  • the exemplary power assist device 100 includes a friction roller configured to drive when engaged the wheel 206.
  • the power assist device 100 is attached to the wheelchair 202 below the arm 204, to position the power assist device 100 above the wheel 206 center and to the side of the wheelchair 202 seating area.
  • the exemplary wheelchair 202 depicted by FIG. 2E also includes the upper lateral wheelchair frame support 208, the lower lateral wheelchair frame support 210, and the vertical wheelchair frame support 212.
  • FIGs. 2A-2E each depict one side of an exemplary wheelchair 202 implementation according to the present disclosure.
  • the exemplary wheelchair 202 implementations depicted by FIGs. 2A-2E are illustrative of a wheelchair 202 having an exemplary power assist device configured on both sides of the wheelchair 202, for example as described in further detail at least with reference to FIGs. 3, 9, 10A, and 10B.
  • Multiple power assist devices may be atached to an exemplary wheelchair in multiple ways.
  • a combination of the power assist atachment locations illustrated by FIGs. 2A-2E may be configured to atach multiple power assist devices to an exemplary wheelchair.
  • FIG. 2A-2E may include a power assist device 100 atached to one side of the wheelchair 202 below the arm 204 as depicted by FIG. 2E, and the wheelchair 202 may also include a second power assist device 100 atached on the other side of the wheelchair to the wheelchair 202 upper lateral wheelchair frame support 208 as depicted by FIG. 2B.
  • one power assist device 100 may be atached to the wheelchair 202 above the wheel 206 center and behind the wheelchair 202 seating area as depicted by FIG. 2A, and the wheelchair 202 may also include a second power assist device 100 attached on the other side to the wheelchair 202 lower lateral wheelchair frame support 210.
  • an exemplary wheelchair 202 implementation may include any combination of the power assist device 100 attachment configurations depicted by FIGs. 2A-2E.
  • Some example wheelchair 202 designs may include more than two power assist devices.
  • a wheelchair 202 may be configured with four power assist devices 100.
  • each of two wheelchair 202 main wheels may be driven by two friction rollers.
  • a wheelchair having multiple power assist devices with multiple friction rollers driving one wheel may have increased load carrying capacity.
  • Some example wheelchair implementations may include power assist devices configured with an engagement unit adapted to engage or disengage multiple friction rollers from one wheel substantially at the same time.
  • multiple friction rollers may be operably linked with a spring-loaded connecting rod to releasably engage or disengage a secondary friction roller from a wheel when the primary friction roller is engaged or disengaged by user operation of an engagement unit.
  • Various exemplary wheelchair implementations may include multiple power assist devices each configured with an independent engagement unit permitting a user to separately and independently engage or disengage multiple friction rollers from one wheel.
  • An exemplary wheelchair implementation configured to permit a user to independently engage or disengage multiple friction rollers from one wheel may permit a user to adapt the wheelchair’s thrust to the load or terrain.
  • a wheelchair could be adapted to carry a heavier load such as additional luggage based on engaging a secondary power assist device including a second friction roller driven by a second motor, to increase thrust to the same wheel already driven by a primary power assist device including a primary friction roller driven by a primary motor.
  • a secondary power assist device including a second friction roller driven by a second motor
  • a primary friction roller driven by a primary motor Such an example wheelchair configuration including multiple independently operable motors and friction rollers adapted to drive each wheel may permit a user to operate the wheelchair more effectively in hilly or mountainous terrain based on engaging multiple motors and friction rollers per wheel when needed, and engaging only one motor and friction roller per wheel on less hilly terrain.
  • the communication unit 110 (shown in FIG. 3) and the second communication unit 304 (shown in FIG. 3) is a wired communication unit.
  • Examples of the communication unit 110 (shown in FIG. 3) and the second communication unit 304 (shown in FIG. 3) include but not limited to cables, wires, Bluetooth®, NFC. It would be readily apparent to those skilled in the art that various types of communication unit such as wired or wireless unit may be envisioned without deviating from the scope of the present invention.
  • the joystick 102 is programmable and enabled to store instructions for controlling the speed and direction of motor 112 (shown in FIG. 1).
  • the j oy stick 102 receives power from the power source 108 (shown in FIG. 1 ).
  • the use of a battery operated joystick is known for controlling power wheelchairs.
  • the joystick 102 may be a device that is compatible with commercially available joystick devices designed to be plugged in and disconnected by an end user, to reduce user effort and expense replacing the joystick due to wear and tear through normal use.
  • the joystick 102 may be a Bluetooth® enabled joystick, permitting remote control of the wheelchair within the communication range of the device using a wireless joystick that is not physically installed in the wheelchair.
  • the user riding in the wheelchair may hold a Bluetooth® enabled or wireless joystick 102 in either hand, or in any way that is comfortable or effective, to operate their wheelchair without constraint by a wired or permanently installed joystick.
  • the joystick 102 may include a pop socket ring holder configured to permit a user to effectively manipulate a wireless joystick that is not physically installed in the wheelchair.
  • the power source 108 is a battery.
  • the batteries may be rechargeable such as but not limited to using an ordinary 110V or 220V charger.
  • Sample batteries that may work with this device include but are not limited to a primary battery (non- chargeable) and secondary batteries such as Lithium-ion (Li-ion), Nickel Cadmium (Ni-Cd), Nickel-Metal Hydride (Ni-MH) and Lead- Acid.
  • FIG. 3 illustrates a top perspective view of the device 100 attached to the manual wheelchair 202 in accordance with an embodiment of the present invention.
  • the retractable friction roller 104 is mounted on the axle 114 (shown in FIG. 1) and rotated by activation of the motor 112.
  • the device includes a motor with a friction surface.
  • the motor may be an electric motor.
  • the motor may be an Alternating Current (AC) motor.
  • the motor may be a Direct Current (DC) motor.
  • the DC motor may be a brushless DC motor.
  • the motor may be a speed control motor.
  • the motor may be a geared motor.
  • the motor may be a brushed motor.
  • the motor may be a hub motor.
  • the motor may be a brushless hub motor.
  • the motor may be a brushless hub motor with electromagnetic braking.
  • the motor may be a worm gear motor.
  • the motor may be any other type of motor including, but not limited to, a geared hub motor, a brushed hub motor, a brushless geared hub motor, a brushed geared hub motor, a non-hub motor, or any other similar motor.
  • Hub motors are very common in power wheelchairs but are typically used for separate wheels that contact the ground directly.
  • the motor may be configured with an electromagnetic brake.
  • the electromagnetic brake configured in the motor provides the wheelchair with braking capability, without the need for a separate braking system.
  • the electromagnetic brake configured in the motor releases the motor to freely rotate when the motor is energized with electric power.
  • the electromagnetic brake configured in the motor locks the motor to prevent rotation when the motor is not energized with electric power.
  • Configuring an exemplary device 100 with motors having an electromagnetic brake feature provides the device 100 with a failsafe braking system integrated with the drive capability.
  • a wheelchair configured with the device 100 using motors having an electromagnetic brake feature would simply stop when battery power failed.
  • the joystick and/or communication unit may be configured to switch off electrical power to one or more motors in response to joystick input indicating a user desire to stop the wheelchair. For example, to stop the wheelchair, the user may release the joystick to a center position from a forward position.
  • the joystick may be configured to disconnect electric power from the motors when the joystick is in the center position, stopping the motors from turning and locking the motors by engaging the electromagnetic brakes in the motors. Locking the motors and engaging the electromagnetic brakes in the motors secures the wheelchair by locking the wheelchair wheels through force with the friction roller.
  • the friction roller point of contact (1115) with the wheelchair w heel is above the wheel center, wherein the friction roller is above the top of the wheel.
  • Configuring the device 100 with the friction roller above the top of the wheel advantageously uses the acceleration due to the Earth’s gravity to press down on the wheelchair wheel with the weight of the motor and friction roller to enhance the braking force.
  • An additional advantage of the disclosed integrated electromagnetic braking feature is that the braking may be essentially instantaneous when electric power is disconnected from the motors, that is, the wheels immediately lock and stop the wheelchair, in contrast with drive systems without electromagnetic braking that may gradually slow to a stop when power is disconnected from the motors.
  • the retractable friction roller 104 is placed in contact with at least one wheel 206 of the manual wheelchair 202 to rotate the wheel 206 and move the wheelchair 202.
  • the retractable friction roller 104 rotates the wheel 206 by friction force.
  • Other devices are commonly based on motor to ground movements, PAW uses a friction roller to the wheel to generate movement.
  • the retractable friction roller 104 is shaped to have a centerless concave rim housing configured to provide high friction surface facing the wheel 206 of the wheelchair 202.
  • the centerless concave rim housing acts as a wheel hub to yield a high percentage of surface contact.
  • the high friction surface of the retractable friction roller 104 faces the wheelchair wheel 206 and is customizable to fit the curve and or size of the wheel 206.
  • the friction roller 104 may be configured with a rim that is not concave but may comprise a flat surface to engage a wheel.
  • the material of high friction surface of the retractable friction roller 104 is rubber or polyurethane.
  • various types of material such as silicone, foam, sand paper, grit tape, sponge-rubber foam etc. may be envisioned without deviating from the scope of the present invention.
  • the wheels 206 of wheelchair 202 are made using a high friction surface
  • the roller 104 is made of steel, aluminum or other similar hardened, textured surface.
  • the friction roller 104 may be configured with a rim having a built-in friction surface.
  • the friction surface may be knurled. The knurled friction surface may be machined.
  • the friction surface may be machined into the retractable friction roller 104 to provide high friction surface facing the wheel 206 of the wheelchair 202.
  • the machined surface of the friction roller 104 may be knurled using a straight pattern.
  • knurling such as, for example, right hand knurl, left hand knurl, diamond knurl, or the like, of the friction roller 104 high friction surface may be envisioned without deviating from the scope of the present invention.
  • the motor 112 is configured to rotate the retractable friction roller 104.
  • the retractable friction roller 104 is mounted on the axle 114 (shown in FIG. 1) and the rotor 116 (shown in FIG. 1) rotates the first axle resulting in rotation of the retractable friction roller 104.
  • the motor 112 is a brushless DC motor with a friction surface. How ever, it would be readily apparent to those skilled in the art that various types of motor such as geared hub motor, brushed hub motor, brushed geared hub motor etc. may be envisioned without deviating from the scope of the present invention.
  • the device 100 further includes a second motor 302 operably connected to a second communication unit 304 and the power source 108 (shown in FIG. 1).
  • the communication unit 110 and the second communication unit 304 are both operably connected to the joystick 102.
  • the joystick 102 may further include control buttons 316 operably connected to the motor. The control buttons 316 controls speed of the motor 112 (shown in FIG. 3).
  • the second motor 302 includes a second axle (not shown) connected to a second rotor (not shown).
  • the device 100 further includes a second friction roller 306 mounted on the second axle (not shown).
  • the second roller 306 is placed in contact with a second wheel 308 of the manual wheelchair 202.
  • the second roller 306 is mounted to the axle 114 and the motor 112 provides motor torque to rotate the second friction roller 306 and the friction roller 104 (not shown).
  • the second retractable friction roller 306 includes a centerless concave rim housing configured to provide high friction surface facing the second wheel 308 of the wheelchair 202.
  • the principle and function of the second motor 302 and second friction roller 306 is the same as the motor 112 and retractable friction roller 104 as previously described.
  • the device 100 further includes a second engagement unit 310 attached to the manual wheelchair 202 to detachably attach the second friction roller 306 and the second wheel 308 of the wheelchair 202.
  • the engagement unit 106 detachably attaches the friction roller 104 and the wheel 206.
  • the engagement unit 106 and the second engagement unit 310 is attached behind seating area 312 of wheelchair 202 and top of the wheel 206 and the second wheel 308, respectively.
  • FIG. 4 illustrates perspective view of engagement unit 106 in accordance with another embodiment of the present invention.
  • the engagement unit 106 includes a lever 502 operably connected to a lever mechanism unit 504, a turnbuckle 506 connected to the lever mechanism unit 504 and an attachment unit 508 operably connected to the turnbuckle 506.
  • the attachment unit 508 comprises clamps (shown in FIG. 5) and a spring loaded unit (shown in FIG. 5).
  • the retractable friction roller (104, shown in FIG. 3) is operably connected to the turnbuckle 506.
  • the lever 502 is actuated by the user and results in engaging and disengaging of the retractable friction roller (104, shown in FIG. 3) from the wheel 206.
  • the lever 502 results in converting a manual wheelchair into an electronic wheelchair and vice versa.
  • FIG. 6 another embodiment of the device 100 is shown with a safety fender 509 also herein referred to as a cover, protective cap and/or shield; which comprises a top, an open bottom, a right side, a left side, a proximal side and distal side wherein each of the four sides has a bottom edge and at least one set of brushes 510 is attached to the bottom edge of the distal side of the safety fender 509 and the safety fender 509 is detachably attached to the wheelchair 202 such as but not limited to attachment by clamps 402 and wherein the safety fender 509 fits over the attachment friction roller 104.
  • the safety fender 509 may be attached to a motor 112 (depicted at least in FIG. 3).
  • the safety' fender 509 may be attached to a second motor 302 (depicted at least in FIG. 3).
  • the safety fender 509 may be attached to a bracket 704 (depicted at least in FIGs 7A-7B).
  • the at least one set of brushes 510 are positioned on the bottom edge of the distal side of the fender so that the brushes 510 contact the wheel 206 of the wheelchair 202.
  • the at least one set of brushes 510 may vary to optimize the contact between the friction roller 104 and the wheel 206. This is accomplished in part as the at least one set of brushes function to brush away and or clearing debris from coming in between the friction roller 104 and the wheel 206.
  • the cover 509 is a protective barrier that shields the top and four sides of the protects the friction roller 104 and axle 114 from environmental exposure, debris and damage.
  • the fender 509 may improve the long-term use and function of the device 100 by protecting the friction roller 104 and axle 114 from environmental exposure and preventing environmental debris from impacting or entering into the inner functioning components of the device 100 motor through contact of the wheel 206 with the with the friction roller 104.
  • the fender 509 is also a safety device. More specifically, the fender 509 improves the safety of the user by preventing clothing, hair, hands and fingers from being caught, snagged or trapped by the device especially as the wheel 206 rotates.
  • FIGs. 7A-7B together illustrate side views of exemplary wheelchair power assist device components.
  • the exemplary wheelchair power assist device 100 includes the friction roller 104 mounted to the axle 114.
  • the friction roller 104 is attached to a motor 112 (depicted at least in FIG. 3) and the motor 112 is attached to the bracket 704.
  • the friction roller 104 may be attached to the bracket 704.
  • the bracket 704 is configured to attach the motor 112 (depicted at least in FIG. 3) to a wheelchair 202 (depicted at least in FIG. 3) via the attachment unit 508.
  • the bracket 704 may be configured to attach a second motor 302 (depicted at least in FIG.
  • the top of the bracket 704 is pivotally coupled with the top of the attachment unit 508.
  • the top of the bracket 704 may be pivotally coupled with the top of the attachment unit 508 by a swivel pin, for example.
  • the bottom of the bracket 704 is connected with the turnbuckle 506.
  • Pivotally coupling the top of the bracket 704 with the top of the attachment unit 508, and connecting the bottom of the bracket 704 with the turnbuckle 506, permits the lower portion of the bracket 704 to move relative to the attachment unit 508 in response to operation of the lever 502 by the handle 702.
  • moving the lever 502 drives the turnbuckle 506 via the lever mechanism unit 504, thereby raising or lowering the friction roller 104 to releasably engage the friction roller 104 and a wheel 206 (depicted at least in FIG. 5) via operation of the lever mechanism unit 504.
  • FIG. 7A the lower portion of the bracket 704 has been displaced away from the attachment unit 508 by operation of the lever 502.
  • the exemplary wheelchair power assist device 100 operation unit 706 assembly includes the turnbuckle 506 connected to the bracket 704 and the lever mechanism unit 504.
  • the lever mechanism unit 504 operably couples the lever 502 and handle 702 with the bracket 704 via the turnbuckle 506, permitting a user to releasably engage a friction roller 104 (depicted at least in FIG. 7A) and a wheel 206 (depicted at least in FIG. 5) via operation of the lever mechanism unit 504.
  • the lower portion of the bracket 704 has been displaced toward the attachment unit 508 by operation of the lever 502.
  • FIG. 8 illustrates a side view of an exemplary wheelchair power assist device operation unit assembly in an exemplary retracted configuration.
  • the exemplary wheelchair power assist device operation unit assembly 706 components are shown retracted to collapse the operation unit assembly 706 to facilitate space-efficient storage and transport.
  • the exemplary' wheelchair power assist device operation unit assembly 706 retracted configuration includes the lever 502 and handle 702 coupled via the lever mechanism unit 504 and turnbuckle 506 with the bracket 704 (depicted at least in FIGs. 7A and 7B) and attachment unit 508.
  • FIG. 9 illustrates a top perspective view of an exemplary wheelchair with two illustrative power assist devices each configured to drive one of the two depicted wheelchair main wheels. In FIG.
  • the exemplary wheelchair 202 includes the main wheels 206 and 308.
  • the wheelchair 202 is configured with a wheelchair power assist device operation unit assembly 706 to drive the main wheel 206 via the friction roller 104.
  • the wheelchair 202 is configured with a second wheelchair power assist device operation unit assembly 706 to drive the second main wheel 308 via the second friction roller 306.
  • Configuring the friction roller 104 and 306 above the respective wheels 206 and 308, and at the rear of the wheelchair 202 permits wheelchair power assist device installation and removal from behind the wheelchair while the wheelchair 202 seat is occupied by a person riding in the wheelchair 202.
  • a person riding may releasably engage power assist to the wheel 206 by operating the lever 502 (depicted in FIGs. 7A and 7B) of the wheelchair power assist device operation unit assembly 706.
  • the person while riding in the wheelchair 202 may releasably engage power assist to the second wheel 308 by operating the lever 502 (depicted in FIGs. 7A and 7B) of the second wheelchair power assist device operation unit assembly 706.
  • the friction rollers 104 and 306 disengage from the respective wheelchair 202 wheels 206 and 308, and the wheelchair 202 operates normally with manual propulsion by the user turning the wheels 206 and 308 by hand.
  • the person riding in the wheelchair 202 under manual propulsion may engage power assist to the wheels 206 and 308 by operating the lever 502, to engage the friction rollers with the wheels.
  • FIG. 10A illustrates a rear perspective view of an exemplary wheelchair with two illustrative power assist devices each configured to drive one of the two depicted wheelchair main wheels, with the wheelchair in an exemplary unfolded configuration.
  • the exemplary wheelchair 202 is a collapsible wheelchair depicted in an illustrative unfolded configuration.
  • the friction roller 104 is configured to drive the wheel 206 by an exemplary power assist device (depicted for example by FIGs. 1-6, 7A-B, and 8-9).
  • the second friction roller 306 is configured to drive the second wheel 308 by an exemplary second power assist device (depicted for example by FIGs. 1-6, 7A-B, and 8-9).
  • the friction rollers 104 and 306 are configured above the respective wheels 206 and 308, and behind the wheelchair 202 seating area 312. In the illustrated example, configuring the friction rollers 104 and 306 above the respective wheels 206 and 308, and behind the wheelchair 202 seating area 312, permits folding and unfolding the collapsible wheelchair 202 while the power assist devices remain installed, as a result of leaving open the space 1005 between the power assist devices.
  • the friction rollers 104 and 306 may be disposed above the center of the respective wheels 206 and 308, between the respective wheel centers and the tops of the wheels, or above the wheels as depicted, to facilitate leaving open the space 1005 and permit folding and unfolding the collapsible wheelchair 202 while the power assist devices remain installed.
  • the space 1005 is also left open as a result of the power assist device design that includes separate and distinct power assist devices each configured to drive one of the wheels 206, 308, without power assist device components occupying the space 1005.
  • the wheelchair 202 may be folded while the power assist remains installed or attached to the wheelchair 202, independent of whether the power assist is engaged or disengaged, without affecting the folding action of the wheelchair 202, as a result of leaving the space 1005 open between the two power assist devices each configured to drive one of the wheels 206 and 308.
  • FIG. 10B illustrates a rear perspective view of an exemplary wheelchair with two illustrative power assist devices each configured to drive one of the two depicted wheelchair main wheels, with the wheelchair in an exemplary folded configuration.
  • the exemplary wheelchair 202 is a collapsible wheelchair depicted in an illustrative folded configuration.
  • the friction rollers 104 and 306 are configured above the respective wheels 206 and 308, and behind the wheelchair 202 seating area 312.
  • the collapsible wheelchair 202 has been folded while the power assist devices remained installed. This facilitation may be a result of the depicted power assist design, that leaves open the space 1005 between the power assist devices and behind the wheelchair 202 seating area 312, without power assist device components occupying the space 1005.
  • FIGs. 11A-11D illustrate perspective views of the exemplary engagement unit 106 (also depicted at least by FIGs. 1, 3, and 4) implementation in accordance with the present disclosure.
  • FIG. 11A is a side perspective view of the engagement unit 106 depicted in an exemplary disengaged mode.
  • FIG. 1 IB is a side perspective view of the engagement unit 106 illustrated in an exemplary engaged mode.
  • FIG. 11C is a rear perspective view of the engagement unit 106 depicted in an exemplary disengaged mode.
  • FIG. 1 ID is a rear perspective view of the engagement unit 106 depicted in an exemplary engaged mode.
  • the engagement unit 106 includes the lever 502 operably connected to the lever mechanism unit 504.
  • the depicted friction roller 104 is configured with the friction surface 1105 (depicted by FIGs. 11C and 11D) designed to provide high friction with the wheel 206 when the friction roller 104 is in contact with the wheel 206.
  • the lever mechanism unit 504 is attached to the motor 112 bracket to engage and disengage the friction roller 104 friction surface 1105 and the wheel 206.
  • the friction roller 104 includes the concave rim housing 1110 (depicted by FIGs. 11C and 1 ID) designed to fit the wheel 206 and function as a wheel hub to yield a high percentage of surface contact between the friction roller 104 and the wheel 206.
  • the concave rim housing 1110 may be a centerless concave rim housing.
  • FIG. 11D the friction roller 104 is depicted engaged with the wheel 206 at an exemplary point on the contact surface 1115 between the wheel 206 and the friction roller 104.
  • moving the lever 502 drives the lever mechanism unit 504, thereby raising or lowering the friction roller 104 to releasably engage the friction roller 104 and the wheel 206 via operation of the lever mechanism unit 504.
  • the upper portion of the bracket 704 has been displaced toward the attachment unit 508 by operation of the lever 502.
  • the upper portion of the bracket 704 has been displaced away from the attachment unit 508 by operation of the lever 502.
  • the exemplary engagement unit 106 includes a mechanical one button engage and disengage attached to the motor, to raise or lower the friction roller 104 and releasably engage the friction roller 104 and the wheel 206.
  • the mechanical engage and disengage unit may comprise an engagement actuator 1200.
  • Exemplary engagement actuator 1200 implementations may comprise, for example, an exemplar)' linear actuator 1205 (depicted by FIG. 12A), an exemplary linear slide rail 1210 (depicted by FIG. 12B), an exemplary linear screw rail, or an exemplary push/pull solenoid 1215 (depicted by FIG. 12C).
  • the power source 108 is a battery.
  • the batteries are chargeable using an ordinary 110V or 220V charger.
  • Examples of battery include but not limited to primary battery (non-chargeable) and secondary batteries such as Lithium-ion (Li-ion), Nickel Cadmium (Ni— Cd), Nickel-Metal Hydride (NiMH), and Lead- Acid.
  • FIG. 5 illustrates perspective view of the device 100 in accordance with another embodiment of the present invention.
  • the attachment clamps 402 and a spring loaded unit 404 engage and disengage the retractable friction roller 104 and the wheel 206.
  • the friction roller 104 is mounted on the axle 114.
  • the friction roller 104 has an opening to receive the axle 114.
  • the axle 114 is a cylindrical elongated rod to pass through the opening to rotate the friction roller 104 on receiving motor torque from the rotor (116, shown in FIG. 1).
  • attachment unit 508 are simple mechanical devices such as but not limited to spring, screw clamp, mechanical coupling, latch, rod clamp, rail clamp, light, round center mount, mount bracket, pole clamp, pipe clamp, quick release clamp, rack clamp mount, bolt, screw, or handlebar clamp mount on the backrest frame of wheelchair 202 and provides contact between the friction roller 104 and the wheelchair wheel 206, respectively.
  • Various exemplary attachment unit 508 implementations may include any fastener adaptable to mount the device to the wheelchair.
  • FIGs. 13A-13D depict perspective views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • FIG. 13 A depicts one side of the exemplary engagement and attachment implementation including the engagement actuator 1200 operably coupled with the attachment member 508 and the engagement member 704 to move the engagement member 704 relative to the attachment member 508.
  • the attachment member 508 is a bracket which may hereinafter be referred to as an attachment bracket 508.
  • the clamp 1305, the clamp fastener 1310, the collar 1315, and the adapter plate 1320 are configured to removably secure the attachment bracket 508 to an exemplary wheelchair 202 (in an illustrative example, at least a portion of an exemplary wheelchair 202 is depicted at least in FIGs. 2A-2E, 3, 9, 10A- 10B, 14A-14B, 15A-15B, 16B, 17B, 18C, 19B, 20A-20C, 21A-21D, 22, and 24-30).
  • the engagement member 704 is a bracket which may hereinafter be referred to as an engagement bracket 704.
  • the attachment bracket 508 includes the attachment bracket 508 first end 1335 and the attachment bracket 508 second end 1340.
  • the engagement bracket 704 includes the engagement bracket 704 first end 1345 and the engagement bracket 704 second end 1350.
  • the engagement actuator 1200 movable shaft 1330 is connected to the engagement bracket 704 and the attachment bracket 508. The engagement actuator 1200 movable shaft 1330 is configured to move the engagement bracket 704 relative to the attachment bracket 508 as the movable shaft 1330 extends or retracts using the engagement actuator 1200.
  • the engagement bracket 704 first end 1345 is rotatably coupled with the attachment bracket 508 first end 1335, to permit the engagement bracket 704 to move relative to the attachment bracket 508.
  • extending or retracting the movable shaft 1330 may move the engagement bracket 704 relative to the attachment bracket 508 between a disengaged position wherein a friction roller is not in contact with a wheelchair 202 wheel and an engaged position wherein the friction roller is in contact with the wheelchair wheel, as depicted and described at least with reference to FIGs. 15A-15B.
  • an exemplary implementation may comprise at least a first engagement member 704 and a first attachment member 508 configured to drive a wheelchair first wheel using a first friction roller and a first motor; and a second engagement member 704 and a second attachment member 508 configured to drive a wheelchair second wheel using a second friction roller and a second motor, in accordance with what has been described hereinabove.
  • the adapter plate 1320 secures the collar 1315 to position the collar 1315 opening central axis substantially perpendicular to the attachment bracket 508 length to permit attaching the collar 1315 to a horizonal portion of a wheelchair.
  • FIGs. 13A-13B the adapter plate 1320 secures the collar 1315 to position the collar 1315 opening central axis substantially perpendicular to the attachment bracket 508 length to permit attaching the collar 1315 to a horizonal portion of a wheelchair.
  • the collar 1315 is secured to the attachment bracket 508 second end 1340 without the use of an adapter plate and with the collar 1315 opening central axis substantially parallel to the attachment bracket 508 length to permit attaching the collar 1315 to a vertical portion of a wheelchair.
  • the attachment bracket 508 is a U-shaped bracket with walls running the length of the bracket, with the engagement actuator 1200 centrally connected within the attachment bracket 508 walls and an inside surface of the engagement bracket 704.
  • the engagement actuator 1200 is connected to the outside of one side of the attachment bracket 508 and the outside of the engagement bracket 704.
  • FIGs. 14A-14B depict outside and inside views of an exemplary engagement and attachment implementation with the movable shaft 1330 in an exemplary extended mode.
  • FIG. 14A depicts the exemplary engagement and attachment implementation from an outside point of view looking into the wheelchair 202.
  • FIG. 14B depicts the exemplary engagement and attachment implementation from an inside point of view underneath the wheelchair 202.
  • FIGs. 15A-15B depict side views of an exemplary engagement and attachment implementation in exemplary disengaged and engaged modes. The implementation depicted by FIGs.
  • 15A-15B includes the first engagement member 704 and a first attachment member 508 (not visible) configured to drive the wheelchair 202 first wheel 206 using the first friction roller 104 and the first motor 112; and, the second engagement member 704 and the second attachment member 508 configured to drive the wheelchair 202 second wheel 308 using the second friction roller 306 and the second motor 302.
  • first engagement member 704 and a first attachment member 508 (not visible) configured to drive the wheelchair 202 first wheel 206 using the first friction roller 104 and the first motor 112
  • the second engagement member 704 and the second attachment member 508 configured to drive the wheelchair 202 second wheel 308 using the second friction roller 306 and the second motor 302.
  • the first friction roller 104 is operably coupled with the first engagement bracket 704, wherein the first friction roller 104 comprises the first centerless concave rim housing 1110 comprising a first friction surface; the first motor 112 is operably coupled with the first friction roller 104; and a first engagement actuator 1200 (not visible) is connected to the first attachment member 508, wherein the first engagement actuator 1200 comprises a movable shaft 1330 (not visible) configured to move the first engagement member 704 relative to the first attachment member 508 between a disengaged position (depicted at least by FIG. 15 A) wherein the first friction roller 104 is not in contact with the wheelchair 202 first wheel 206 and an engaged position (depicted at least by FIG.
  • the second friction roller 306 is operably coupled with the second engagement bracket 704, wherein the second friction roller 306 comprises the second centerless concave rim housing 1110 comprising a second friction surface; the second motor 302 is operably coupled with the second friction roller 306; and the second engagement actuator 1200 is connected to the second attachment bracket 508, wherein the second engagement actuator 1200 comprises the movable shaft 1330 configured to move the second engagement bracket 704 relative to the second attachment bracket 508 between a disengaged position (depicted at least by FIG.
  • the wheelchair 202 is a foldable wheelchair
  • the first motor 112, the first friction roller 104, the first attachment bracket 508, the first engagement bracket 704, the second motor 302, the second friction roller 306, the second attachment bracket 508, and the second engagement bracket 704 may remain attached to the foldable wheelchair 202 when the foldable wheelchair 202 is in a folded or unfolded configuration, as a result of the open space 1005 located behind the seating area of the foldable wheelchair 202 that is configured to accommodate the depicted components.
  • FIGs. 16A-16B depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the depicted exemplary engagement and attachment implementation comprises the engagement bracket 704 having a length not more than half the attachment bracket 508 length.
  • the engagement actuator 1200 is secured directly to the attachment bracket 508 substantially at a mid-point of the attachment bracket 508 length and the engagement bracket 704 first end 1345 is rotatably coupled with the attachment bracket 508 first end 1335.
  • the engagement bracket 704 second end 1350 is displaced relative to the attachment bracket 508 mid-point as the movable shaft extends or retracts.
  • FIG. 16B depicts the exemplary engagement and attachment implementation illustrated by FIG. 16A configured on one side of the exemplary wheelchair 202 proximal with the wheelchair 202 first wheel 206.
  • FIGs. 17A-17B depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the depicted exemplary engagement and attachment implementation includes the attachment bracket 508, engagement bracket 704, and engagement actuator 1200 features described with reference to FIG. 16A
  • the implementation depicted by FIG. 17A further comprises the collar 1315 is secured to the adapter plate 1320 connected to the attachment bracket 508 second end 1340 with the collar 1315 opening central axis perpendicular to the attachment bracket 508 length.
  • FIG. 17B depicts the exemplary engagement and attachment implementation illustrated by FIG. 17A configured on one side of the exemplary' wheelchair 202 proximal with the wheelchair 202 first wheel 206.
  • FIGs. 18A-18C depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the depicted exemplary engagement and attachment implementation includes attachment bracket 508, engagement bracket 704, and engagement actuator 1200 features similar to those features described with reference to FIG. 17A.
  • the engagement actuator 1200 is secured directly to the attachment bracket 508 at the attachment bracket 508 first end 1335, and the engagement bracket 704 first end 1345 is rotatably coupled with the attachment bracket 508 substantially at a mid-point of the attachment bracket 508 length.
  • the engagement bracket 704 second end 1350 is displaced relative to the attachment bracket 508 first end 1335 as the movable shaft 1330 extends or retracts.
  • the attachment bracket 508 is a U-shaped bracket with walls running the length of the bracket, with the engagement actuator 1200 centrally connected within the attachment bracket 508 walls and an inside surface of the engagement bracket 704.
  • the engagement actuator 1200 is connected to the outside of one side of the attachment bracket 508 and the engagement bracket 704.
  • FIG. 18C depicts the exemplary engagement and attachment implementation illustrated by FIG. 18A configured on one side of the exemplary wheelchair 202 proximal with the wheelchair 202 first wheel 206.
  • FIGs. 19A-19B depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the depicted exemplary engagement and attachment implementation includes the attachment bracket 508, engagement bracket 704, and engagement actuator 1200 features described with reference to FIG. 18B.
  • the implementation depicted by FIG. 19A further comprises the collar 1315 is secured to the adapter plate 1320 connected to the attachment bracket 508 second end 1340 with the collar 1315 opening central axis perpendicular to the attachment bracket 508 length.
  • FIG. 19B depicts the exemplary engagement and attachment implementation illustrated by FIG. 19A configured on one side of the exemplary' wheelchair 202 proximal with the wheelchair 202 first wheel 206.
  • FIGs. 20A-20C depict side views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the depicted exemplary engagement and attachment implementation includes attachment bracket 508, engagement bracket 704, and engagement actuator 1200 features similar to those features described hereinabove.
  • the implementation depicted by FIGs. 20A-20C further comprises the engagement bracket 704 rotatably secured at one end of the attachment bracket 508, wherein the engagement bracket 704 rotates between a position substantially parallel to the attachment bracket 508 and a position substantially perpendicular to the attachment bracket 508.
  • the engagement bracket 704 may rotate through more than 90 degrees relative to the attachment bracket 508, as the engagement bracket 704 moves between exemplary engaged and disengaged positions.
  • the engagement bracket 704 may rotate up to 360 degrees relative to the attachment bracket 508.
  • the engagement actuator 1200 is disposed at an angle relative to the attachment bracket 508, to cause the engagement bracket 704 to rotate relative to the attachment bracket 508 as the moveable shaft 1330 extends or retracts.
  • the attachment bracket 508 is secured to the exemplary wheelchair 202 by the two collars 1315.
  • FIG. 20A depicts the exemplary engagement and attachment implementation in an illustrative engaged mode.
  • FIG. 20B depicts the exemplary engagement and attachment implementation in an illustrative intermediate position between the engaged mode depicted by FIG. 20A and the retracted mode depicted by FIG. 20C.
  • FIGs. 21A-21D depict various views of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the depicted exemplary engagement and attachment implementation includes the attachment bracket 508, engagement bracket 704, and engagement actuator 1200 features in accordance with what has been described hereinabove.
  • the implementation depicted by FIGs. 21A-21D further comprises the engagement bracket 704 is configured with a slot (visible at least in FIGs. 21C and 21D) wherein the slot is adapted to subsume a portion of the attachment bracket 508 and wherein the engagement bracket 704 slides along the attachment bracket 508 length as the engagement bracket 704 moves relative to the attachment bracket 508.
  • a slot visible at least in FIGs. 21C and 21D
  • FIG. 21A-21D the engagement bracket 704 slides along the attachment bracket 508 length as the moveable shaft 1330 extends or retracts.
  • the attachment bracket 508 is secured to the exemplary wheelchair 202 by the two collars 1315.
  • FIG. 21 A depicts the exemplary engagement and attachment implementation in an illustrative engaged mode.
  • FIG. 21B depicts the exemplary engagement and attachment implementation in an illustrative retracted mode side view.
  • FIG. 21C depicts a front perspective view of the illustrative retracted mode depicted in a side view by FIG. 21B.
  • FIG. 21D depicts a side detail view of the exemplary engagement and attachment implementation in an illustrative disengaged mode.
  • FIG. 22 depicts an exemplary front detail view of an exemplary engagement and attachment implementation in accordance with the present disclosure.
  • the exemplary engagement actuator 1200 is powered and controlled through the engagement actuator electrical connection 2210.
  • the engagement actuator 1200 may be controlled by an engage button accessible to a user of the wheelchair 202.
  • the engage button may be configured to control the engagement actuator 1200 using the engagement actuator electrical connection 2210.
  • the engagement actuator 1200 is secured to the adapter plate 1320 by the engagement actuator adapter securing screw 2215.
  • the collar 1315, the upper engagement actuator collar securing screw 2205, and the lower engagement actuator collar securing screw 2220 secure the adapter plate 1320 to the wheelchair 202.
  • FIG. 23A depicts a top perspective view of an exemplary exchange tab 2300 implementation.
  • FIGs. 23B and 23C depict side perspective views of the exemplary exchange tab 2300 implementation illustrated by FIG. 23A.
  • the exchange tab 2300 comprises the tab mount holes 2305.
  • the tab mount holes 2305 may be configured in various numbers or shapes in various locations of the exchange tab 2300.
  • the exchange tab 2300 may comprise metal, fiberglass, composite, or other material.
  • FIG. 23D depicts a front perspective view of an exemplary exchange actuator arrangement.
  • the exemplary exchange actuator arrangement comprises the exchange tab 2300.
  • the tab mount holes depicted by FIGs. 23B and 23C are disposed in alignment with the engagement member mount holes 2310 configured in the engagement member 704.
  • the engagement member 704 comprises the motor mount holes 1325a,b,c,d illustrated at least by FIGs. 13C, 16A and 18A.
  • the engagement actuator 1200 comprises the movable shaft 1330. The movable shaft 1330 is connected to the engagement member 704.
  • the adapter plate 1320 is operably connected to the engagement actuator 1200.
  • the collar 1315 is configured to removably secure the adapter plate 1320 to an exemplary wheelchair 202 (in illustrative examples, at least a portion of an exemplary wheelchair 202 is depicted at least in FIGs. 2A-2E, 3, 9, 10A-10B, 14A-14B, 15A-15B, 16B, 17B, 18C, 19B, 20A-20C, 21A-21D, 22, and 24-30).
  • the engagement actuator 1200 movable shaft 1330 is configured to move the engagement member 704 relative to a wheelchair 202 as the movable shaft 1330 extends or retracts using the engagement actuator 1200.
  • the engagement member 704 is configured to be rotatably coupled with the exchange tab 2300.
  • the exchange tab 2300 may be secured to a wheelchair 202.
  • the depicted implementation configures the engagement member 704 to rotate about a central axis through the tab mount holes 2305 as the movable shaft 1330 is extended or retracted.
  • extending or retracting the movable shaft 1330 when the exchange tab 2300 is secured to a wheelchair 202 may move the engagement bracket 704 relative to the exchange tab 2300 and wheelchair 202.
  • FIG. 23E depicts aside view of the exchange actuator arrangement shown in FIG. 23D.
  • FIG. 24 depicts an exemplar.- wheelchair viewed from a right rear perspective.
  • the exemplary wheelchair 202 comprises the exchange tab 2300.
  • the exchange tab 2300 may be welded to the wheelchair 202.
  • the wheelchair 202 comprises the wheel 206 and the arm 204.
  • FIG. 25 depicts an exemplar.- wheelchair viewed from a right rear perspective.
  • the exemplary wheelchair 202 comprises the two exchange tabs 2300.
  • the two exchange tabs 2300 are welded to the back of the wheelchair 202 at either side of the seating area 312.
  • the wheelchair 202 comprises the wheel 206 and the second wheel 308.
  • FIG. 26 depicts a partial exploded view of an exemplary wheelchair and exemplary exchange actuator arrangement components viewed from a left rear perspective.
  • the example depicted by FIG. 26 shows the wheel 206 disposed on the right side of the wheelchair 202.
  • the example depicted by FIG. 26 shows the exemplary exchange actuator arrangement components comprising the exchange tab 2300 in an exemplary position to facilitate mounting the exchange tab 2300 to the left side of the wheelchair 202.
  • the exemplary exchange actuator arrangement components further comprise the engagement member 704, the collar 1315, the adapter plate 1320 and the engagement actuator (depicted for example at least in FIGs. 23D and 23E).
  • the engagement actuator further comprises the movable shaft 1330.
  • the exemplary exchange actuator arrangement components are shown in an exemplar ⁇ ' position to be configured to enable the second motor 302 and the second friction roller 306 to drive a second wheel (not shown).
  • the second wheel (depicted for example at least by FIGs. 25 and 27 with reference to second wheel 308 therein) would be disposed on the opposite side of the wheelchair 202 from the depicted wheel 206.
  • FIG. 27 depicts exemplary wheelchair 202 viewed from a top left side perspective.
  • the exchange tab 2300 is secured to the left side of the wheelchair 202.
  • the exemplary exchange actuator arrangement is shown in an illustrative position to permit mounting the engagement member 704 to the exchange tab 2300.
  • An exemplary wheelchair 202 may be configured with two exchange actuator arrangements similarly positioned with one exchange actuator arrangement at each side of the wheelchair. Configuring a wheelchair with two exchange actuator arrangements similarly positioned with one at each side may permit selectively and independently engaging and disengaging two friction rollers with two respective wheelchair wheels while leaving an open space behind the seating area 312.
  • the open space behind the seating area 312 may permit folding a foldable wheelchair while the devices described herein remain installed on the wheelchair.
  • FIG. 28 depicts the exemplary wheelchair shown by FIG. 27 viewed from a left side perspective.
  • FIG. 29 depicts an exemplary wheelchair viewed from a left rear top perspective.
  • the collar 1315 is secured to the wheelchair 202 and the collar 1315 is secured to the adapter plate 1320.
  • the engagement member 704 is engaged with and in position to be secured to the exchange tab 2300.
  • the engagement member 704 may be secured with the exchange tab 2300 using a locking pin or similar mechanism.
  • the engagement actuator 1200 includes a movable shaft (depicted for example at least in FIG. 28) configured to move the engagement member 704 relative to the wheelchair 202 as the movable shaft extends or retracts using the engagement actuator 1200.
  • FIG. 30 depicts the exemplary wheelchair shown by FIGs. 27-29 viewed from a left side perspective.
  • the engagement member 704 may be rotatably coupled with the exchange tab 2300 using a removable securing device such as a spring-loaded retractable pin or similar mechanism, permitting a user to remove and reinstall a user’s wheelchair power assist device from their wheelchair.
  • a removable securing device such as a spring-loaded retractable pin or similar mechanism
  • the spring-loaded retractable pin or similar mechanism may be inserted through the tab mount holes 2305 and the engagement member mount holes 2310 to releasably couple the engagement member 704 with the exchange tab 2300 welded to the wheelchair.
  • a user of a wheelchair power assist device in accordance with the present disclosure may exchange their wheelchair power assist device for another wheelchair power assist device while keeping their wheelchair, using the exchange tab 2300 welded to the wheelchair to disconnect the engagement member 704 from an exemplary wheelchair.
  • the user may, for example, install a new, upgraded, restored or refurbished wheelchair power assist device in exchange for their old wheelchair power assist device.
  • a user may exchange their wheelchair configured with the exchange tab 2300 welded to the wheelchair, while keeping their wheelchair power assist device.
  • an exchange depot may provide user access to exchangeable wheelchair power assist devices.
  • a user having a wheelchair power assist device configured in a wheelchair with exchange tabs 2300 welded to their wheelchair may visit a wheelchair power assist exchange depot to exchange their wheelchair or their power assist device for similar devices pre-positioned at the exchange depot.
  • Some exchange depot implementations may comprise automated storage facilities configured to scan a digital identification from a user’s wheelchair power assist device or a user’s wheelchair.
  • a unique digital identification may be encoded in a chip embedded in the wheelchair or in the wheelchair power assist device.
  • the encoded digital identification may be embedded in one or more engagement member 704 of a wheelchair power assist device.
  • the encoded digital identification may be embedded in an exchange tab 2300 welded to a wheelchair.
  • An exemplary component part such as for example an engagement member 704, exchange tab 2300, or wheelchair may be configured with other forms of identification such as a Vehicle Identification Number (VIN) or other identifiers.
  • VIN Vehicle Identification Number
  • the VIN may be printed on a label or tag affixed to the component.
  • the VIN may be embossed or engraved on or into the component.
  • an exchange depot may be configured to use a database to store encoded digital identification codes or other identifiers uniquely associated with particular devices and users.
  • a user may subscribe for an exchange renewal or upgrade permitting the user to travel with their wheelchair power assist without bringing their wheelchair, and plan to visit an exchange facility to obtain a wheelchair upon arrival.
  • a traveling user may fly with their wheelchair power assist device but without bringing their wheelchair or batteries for the power assist.
  • the user may visit an exchange depot upon arrival and present their wheelchair power assist device having an encoded digital identification embedded in an engagement member 704 to the automated exchange for scanning.
  • the automated exchange may use a database to associate the encoded digital identification with an exchange account of the user and determine the user account is authorized for charged battery and wheelchair rental and return.
  • the exchange may
  • T1 dispense a wheelchair and bateries by unlocking a cabinet preloaded with a suitable wheelchair and batteries for the user’s wheelchair power assist device, and the user may go on their way with their powered wheelchair after installation.
  • the user may return the wheelchair and bateries to the exchange facility and continue their journey while travelling with their wheelchair power assist device.
  • a user may travel with their wheelchair having the encoded digital identification associated with their exchange account embedded in one or more exchange tab 2300 welded to the user’s wheelchair.
  • the user may travel with their wheelchair and rent or exchange a wheelchair power assist device for use with their wheelchair, using the exchange tab 2300 to facilitate connecting and disconnecting the wheelchair power assist device.
  • Using encoded digital identification embedded in components of the wheelchair power assist or an exchange tab may reduce a user’s effort accessing wheelchair-based transportation by permiting users to travel without bateries or a wheelchair for their power assist device and obtain those items from an exchange facility upon reaching an intermediate destination. Embedding the encoded digital identification in components of the wheelchair power assist or an exchange tab may prevent fraudulent use and theft of a user’s equipment based on providing a permanent identification more difficult to destroy than identification such as a barcode label that may be removed or a serial number that may be ground or scraped off.
  • an exchange depot may provide user access to a wheelchair configured with the power assist devices.
  • a user having a manual wheelchair without the wheelchair power assist device configured may visit an exchange depot to exchange the user's manual wheelchair for another manual wheelchair provided by the exchange depot, with the power assist device configured in the manual wheelchair provided by the exchange depot.
  • a user having a manual wheelchair with the power assist device configured may visit an exchange depot and exchange the user's manual wheelchair and power assist device for a new wheelchair provided by the exchange depot with anew power assist device configured for any reason.
  • An exemplary exchangeable wheelchair power assist may achieve various advantageous technical effects as a result of a wheelchair and power assist that are exchangeable in various configurations, including but not limited to a wheelchair alone, a wheelchair with the power assist device, or the power assist device alone.
  • an exchangeable wheelchair power assist implementation may reduce a user's effort accessing wheelchair transportation based on providing the user access to a power assist or wheelchair prepositioned at geographically distributed exchange depot locations.
  • Some exchangeable wheelchair power assist implementations may improve a user's quality of life by simplifying a wheelchair user's travel planning and increasing their mobility. For example a wheelchair user may be able to travel greater distances, travel more frequently or more often based on traveling with only their wheelchair or only their wheelchair power assist.
  • Such an exemplary user may, for example, travel with only their power assist and obtain a wheelchair to use temporarily with their power assist.
  • the user may, for example, travel with only their wheelchair and obtain a power assist to use temporarily with their wheelchair.
  • Some example implementations may reduce a wheelchair user's uncertainty about maintenance or repair and reduce their worry about being stranded with an inoperative wheelchair.
  • such a user may find their wheelchair or power assist in need of maintenance or repair and visit an exchange depot to swap out the wheelchair alone, the wheelchair with the power assist device, or the power assist device alone, and be on their way with a functional power assisted wheelchair.
  • An exemplary wheelchair or power assist may be swapped at any facility, locker, or exchange depot.
  • the exchange depot may be a facility having prepositioned wheelchairs and power assist devices implemented in accordance with the present disclosure.
  • the user may be a veteran having a standard manual wheelchair.
  • the exchange depot may be, for example, a facility operated by an entity such as the Veterans Administration (VA).
  • VA Veterans Administration
  • the veteran may go to any VA location having an exchange depot and swap their standard manual wheelchair without the power assist device for a new wheelchair with the power assist device already installed/ready to go. Should that new wheelchair with power assist device installed have any customer service issues, the user may go back to their local VA or any VA and swap their unit out for an entirely new wheelchair with the device installed.
  • an exchange depot may be a facility equipped with wheelchairs and power assist devices prepositioned in lockers.
  • the lockers may be configured with sensors implemented to scan or read identification from a wheelchair or power assist, an embedded computing device / controller, network connectivity, and locks operable by the computing device / controller to release or open one or more locker.
  • identification numbers or codes may be embedded in one or more component part of an exemplary wheelchair, exchange tab, or power assist device, in accordance with the teaching of the present disclosure.
  • a cloud-connected database may be operably coupled with the computing device via a network such as the public internet.
  • the database may be configured with identification numbers or codes that are also embedded in one or more component part of an exemplary wheelchair, exchange tab, or power assist device.
  • a user may have an account comprising a subscription for exchangeable wheelchair power assist services.
  • the user involved in an exemplary exchange may be any user, not exclusively the wheelchair user.
  • Some exchange depot facilities may be configured with a computing device / controller configured to accept payment and establish an initial account for a new user.
  • the user account and subscription for exchangeable wheelchair power assist services may be stored in the database
  • the user account and subscription stored in the database may be associated in the database with the identification numbers or codes that are also embedded in particular components assigned to or subscribed for by the user.
  • a user may visit an exchange depot and present a component of their wheelchair or power assist device to be scanned by a sensor to read the embedded identification code.
  • the facility may comprise a plurality of lockers each retaining a wheelchair or a power assist device.
  • the computing device / controller may send the identification code to a server connected to the database.
  • the server may use the database to identify the user account associated with the particular wheelchair, exchange tab, or power assist device identified by the identification numbers or code scanned by the sensor, based on associating the user account with the scanned identification numbers or code.
  • the user account may comprise a user subscription authorizing a new w heelchair for the user's power assist, or a new power assist for the user's wheelchair.
  • the computing device / controller may open one or more locker to permit the user to access the wheelchair or power assist.
  • the user may take the wheelchair or power assist received from the locker.
  • the computing device / processor may update the database to associate the user account with the scanned identification numbers or code of particular components received from the locker by the user.
  • the user may return wheelchair or power assist components by placing the wheelchair or power assist components that the user previously possessed into respective storage lockers.
  • the computing device / controller may update the database to indicate the exchange depot location where the returned wheelchair or power assist components are stored.
  • the computing device / controller may update the user account in the database to indicate the returned wheelchair or power assist components are no longer possessed by the user.
  • the total weight for the entire device 100 is approximately 20 pounds. It is expected that the speed is 0-5 MPH adjustable, maximum carrying capacity of up to 260 pounds, with a maximum incline up to 10 degrees.
  • the product is classified as a Class 1 device under FDA Code of Federal Regulations Title 21 Subpart D Section 890.3910.
  • the device 100 is exempt from needing direct FDA approval, but would require a 510(k) license.
  • the device 100 is not classified as a medical device and is exempt from needing FDA approval.
  • second retractable friction roller; second engagement unit; and second motor performs exactly same functions as described in the description for retractable friction roller; engagement unit; and motor respectively.
  • one of ordinary skill in the art will be able and may make changes to the size and materials of the friction roller; the size and type of motor or battery used; and/or the type of controller or joystick; and the size and type of attachment devices used to fix the device to the manual wheelchair such as but not limited to a screw clamp.
  • a casing for each of the two units may be added for safety, convenient travel and appearance.
  • the device may be used as a power assist to any object that is traditionally transported on wheels via manual propulsion, such as baggage carts.
  • Some wheelchair power assist device designs may be adapted with a sensor, and configured to automatically stop the wheelchair in an emergency' situation detected based on information captured by the sensor.
  • an exemplary wheelchair may be configured to determine the speed of the wheelchair relative to the ground based on sensor data, compare the detected speed to a predetermined maximum safe speed, and automatically mitigate the unsafe speed based on stopping a motor, reducing the speed of a motor, or reversing a motor.
  • the speed sensor may be, for example, a shaft encoder configured in a wheel.
  • the speed sensor may be a Time of Flight (ToF) sensor pointed forward from the wheelchair passenger, in line with the direction the passenger would typically face.
  • ToF Time of Flight
  • Various wheelchair power assist device implementations may include an emergency kill switch configured to permit a user to manually stop the wheelchair in an emergency situation detected by the user.
  • the joystick may be configured with a button adapted to stop the motor to prevent serious injury or damage in an emergency situation.
  • the switch may be configured as a dead-man switch, which would have to be actively engaged by a user seated in the chair for the wheelchair power assist to move the wheelchair.
  • the dead-man swatch may be implemented with a key lock configured to prevent the motor from activating unless the key is present and turned to the activate position.
  • the dead-man switch may be a weight sensor configured in the wheelchair seat, to prevent motor activation unless body weight of at least a predetermined threshold weight is detected in the wheelchair seat.
  • the threshold weight may be configurable to a specific numeric weight, or to a weight selectable from a range of weights.
  • the dead-man switch may be configured to stop the motor if the wheelchair passenger leaves the wheelchair seat.
  • Some wheelchair power assist device designs may include one or more handle configured to permit a user to grasp the one or more handle while carrying the device.
  • the one or more handle may me rotatably secured with swivels to reduce the user’s effort balancing the load while carrying the device.
  • the one or more handle may be configured with a latch mechanism to secure the handle in the wheelchair power assist device when the handle is not in use.
  • lights may be configured on the front or back of the device.
  • the lights may be warning lights, configured to be visible to others not riding in the wheelchair.
  • the lights may be headlights such as spotlights or floodlights, configured to improve the effective vision of the person riding in the wheelchair. Warning lights may be various colors and may be configured to blink or flash in various patterns to warn others or make the wheelchair more visible to others.
  • Headlights or spotlights may be configured with a swivel mount permitting the wheelchair passenger to manually direct light in a direction of interest.
  • the light swivel mount direction may be adjustable in pan and tilt modes under control of motors governed by the joystick.
  • Various wheelchair power assist device power source designs may include an interchangeable battery replacement system configured to adapt batteries of various diverse form factors and electrical connection geometries to a common form factor designed to electrically connect to and power the wheelchair.
  • some wheelchair power assist device designs may be adapted with an electronic engage and disengage (described with reference to at least FIGs. 12A-C).
  • Some electronic engage and disengage implementations may be configured to be activated using a push button, switch, speech, and via Bluetooth®.
  • Various electronic engage and disengage designs may be integrated with a communication unit to permit operation of the electronic engage and disengage via a joystick.
  • the communication unit may be configured to activate the electronic engage and disengage in response to a predetermined joystick motion patern.
  • the predetermined joystick motion patern may be programmed into the communication unit by a user.
  • the communication unit may be configured to activate the electronic engage and disengage in response to the communication unit recognizing the predetermined joystick motion patern programmed by the user.
  • the electronic engage and disengage may be configured to be activated by the communication unit in response to predetermined voice command received by a microphone configured with the communication unit.
  • the predetermined voice command may include a recorded voice command selected by a user.
  • the electronic engage and disengage may be configured to be activated via Bluetooth®.
  • the user’s mobile device may be configured with a mobile application designed to link via Bluetooth® with the wheelchair communication unit, and provide a user interface adapted to controlling the wheelchair systems including motors and the electronic engage and disengage.
  • a user by operating the mobile application could activate the electronic engage and disengage, and control motor speed, to facilitate control of the wheelchair.
  • a wheelchair speech control interface may be implemented in a mobile application to permit the user to control the wheelchair with verbal commands received by the user’s mobile device.
  • Potential limitations include the following: the device may not work if the maximum weight limit is exceeded; the maximum incline is exceeded; the friction roller is not engaged properly to the powertrain; operation on wet surfaces due to slippage, operation on ice, sand, or oily surfaces, if the batery, motor, or grip components are damaged, if the wheels are locked or do not freely rotate, or if operated in excessive heat.
  • a method to convert a manual wheelchair (202) to an electronic wheelchair comprising: operably connecting a joystick (102) to a communication unit (110); operably connecting the communication unit (110) to a motor (112); connecting an axle (114) to a rotor (116); connecting the motor (112) to the axle (114); mounting a retractable friction roller (104) on the axle (114); configuring the retractable friction roller (104) with a centerless concave rim housing (1110) designed to provide a high friction surface (1105) when the friction roller (104) is placed facing and in contact with a wheel (206); placing the retractable friction roller (104) in contact with a wheel (206) of a manual wheelchair (202); ataching to the wheelchair (202) an engagement unit (106) configured to detachably attach the retractable friction roller (104) and the wheel (206); and operably connecting a power source (108) to the motor (112) and thejoystick (102).
  • the method may further comprise attaching the friction roller (104) to the motor (112) and attaching the motor (112) to a bracket (704) operably coupled via a lever mechanism (504) with a lever (502) to releasably engage the friction roller (104) and a wheel (206) in response to operation of the lever (502).
  • the method may further comprise configuring a safety fender (509) to detachably attach to the wheelchair (202), wherein the safety fender (509) fits over the retractable friction roller (104) when the safety fender (509) is attached to the wheelchair (202).
  • the method may further comprise attaching at least one set of brushes (510) to the safety fender (509), wherein the at least one set of brushes (510), when attached to the safety fender (509), are in contact with the wheel (206), and wherein the safety fender (509) comprises a top, an open bottom, a right side, a left side, a proximal side and a distal side, wherein each of the sides has a bottom edge and the at least one set of brushes (510) is attached to the bottom edge of the distal side of the safety fender (509).
  • the method may further comprise configuring the engagement unit (106) with a lever (502); operably connecting the lever (502) to a lever mechanism unit (504); and operably connecting the lever mechanism unit (504) to the motor (112) bracket.
  • the method may further comprise configuring the engagement unit (106) with a lever (502); operably connecting the lever (502) to a lever mechanism unit (504); operably connecting the lever mechanism unit (504) to a turnbuckle (506); and operably connecting the turnbuckle (506) to an attachment unit (508).
  • the method may further comprise configuring the attachment unit (508) with a spring loaded unit (404); operably connecting the spring loaded unit (404) to the retractable friction roller (104); and operably connecting a clamp (402) to the spring loaded unit (404).
  • the method may further comprise operably connecting a second motor (302) to a second communication unit (304) and the power source (108), and operably connecting the second communication unit (304) to the joystick (102).
  • the method may further comprise configuring the joystick (102) to be operably programmable to generate commands for operating the motor (112) and the second motor (302).
  • the method may further comprise connecting the second motor (302) to a second axle (114), and connecting the second axle (114) to a second rotor (116).
  • the method may further comprise mounting a second retractable friction roller (306) on the second axle (114), and placing the second roller (306) in contact with a second wheel (308) of the manual wheelchair (202).
  • the method may further comprise configuring the second retractable friction roller (306) with a centerless concave rim housing (1110) designed to provide a high friction surface (1105) facing the second wheel (308) of the manual wheelchair (202).
  • the method may further comprise attaching the second friction roller (306) to the top of the second wheel (308) behind the seating area (312).
  • the method may further comprise attaching the second friction roller (306) to the front of the second wheel (308) under the seating area (312).
  • the method may further comprise attaching the second friction roller (306) to the second wheel (308) using the arm (204) of the wheelchair (202).
  • the method may further comprise attaching a second engagement unit (310) to the manual wheelchair (202), wherein the second engagement unit (310) is configured to detachably attach the second friction roller (306) and the second wheel (308) of the wheelchair (202).
  • the method may further compnse configunng the second engagement unit (310) with a second lever (502); operably connecting the second lever (502) to a second lever mechanism unit (504); and operably connecting the second lever mechanism unit (504) to the second motor (302) bracket.
  • the method may further comprise configuring the second engagement unit (310) with a second lever (502); operably connecting the second lever (502) to a second lever mechanism unit (504); operably connecting the second lever mechanism unit (504) to a second turnbuckle (506); and operably connecting the second turnbuckle (506) to a second attachment unit (508).
  • the method may further comprise configuring the second atachment unit (508) with a second spring loaded unit (404); operably connecting the second spring loaded unit (404) to the second retractable friction roller (306); and operably connecting a second clamp (402) to the second spring loaded unit (404).
  • the method may further comprise attaching the friction roller (104) to a motor (112) and attaching the motor (112) to a bracket (704) operably coupled via a turnbuckle (506) with a lever (502) to releasably engage the friction roller (104) and a wheel (206) in response to operation of the lever (502).
  • the method may further comprise attaching the friction roller (104) to the top of the wheel (206) behind the wheelchair (202) seating area (312).
  • the method may further comprise attaching the friction roller (104) to the front of the wheel (206) under the wheelchair (202) seating area (312).
  • the method may further comprise attaching the friction roller (104) to the wheel (206) using the arm (204) of the wheelchair (202).
  • the method may further comprise attaching the friction roller (104) to an upper lateral wheelchair frame support (208).
  • the method may further comprise attaching the friction roller (104) to a lower lateral wheelchair frame support (210).
  • the method may further comprise attaching the friction roller (104) to a vertical wheelchair frame support (212).
  • a method to move a wheelchair (202) comprising: configunng a friction roller (104) to releasably engage with a wheel (206) of a wheelchair (202), based on attaching the friction roller (104) to the wheelchair (202); configuring the friction roller (104) to drive when engaged the wheel (206) through a contact surface (1115) with the wheel (206) above the wheel (206) center and behind the wheelchair (202) seating area (312); configuring a motor (112) to rotate the friction roller (104); and moving the wheelchair (202) based on engaging the friction roller (104) and activating the motor (112) to turn the wheel (206) through force by the friction roller (104) against the contact surface with the wheel (206).
  • the method may further comprise configuring a second motor (302) to rotate a second friction roller (306) configured to drive a second wheel (308) through a contact surface (1115) with the second wheel (308) above the second wheel (308) center and behind the wheelchair (202) seating area (312), based on attaching the second friction roller (306) to the wheelchair (202).
  • the method may further comprise folding the wheelchair (202) while the friction roller (104) remains attached to the wheelchair (202) and the second friction roller (306) remains attached to the wheelchair (202).
  • the method may further comprise disengaging, by a user remaining seated in the wheelchair (202) seating area (312), the friction roller (104).
  • a method to move a wheelchair (202) comprising: configuring a friction roller (104) to releasably engage with a wheel (206) of a wheelchair (202), based on attaching the friction roller (104) to the wheelchair (202); configuring the friction roller (104) to drive when engaged the wheel (206) through a contact surface (1115) with the wheel (206) in front of the wheel (206) under the wheelchair (202) seating area (312); configuring a motor (112) to rotate the friction roller (104); and moving the wheelchair (202) based on engaging the friction roller (104) and activating the motor (112) to turn the wheel (206) through force by the friction roller (104) against the contact surface (1115) with the wheel (206).
  • the method may further compnse configuring a second motor (302) to rotate a second friction roller (306) configured to drive a second wheel (308) through a contact surface (1115) with the second wheel (308) in front of the second wheel (308) under the wheelchair (202) seating area (312), based on attaching the second friction roller (306) to the wheelchair (202).
  • a method to move a wheelchair (202) comprising: configuring a friction roller (104) to releasably engage with a wheel (206) of a wheelchair (202), based on attaching the friction roller (104) to the wheelchair (202); configuring the friction roller (104) to drive when engaged the wheel (206) through a contact surface (1115) with the wheel (206) in front of the seating area (312) using the arm (204) of the wheelchair (202); configuring a motor (112) to rotate the friction roller (104); and moving the wheelchair (202) based on engaging the friction roller (104) and activating the motor (112) to turn the wheel (206) through force by the friction roller (104) against the contact surface (1115) with the wheel (206).
  • the method may further comprise configuring a second motor (302) to rotate a second friction roller (306) configured to drive a second wheel (308) through a contact surface (1115) with the second wheel (308) in front of the seating area (312) using the arm (204) of the wheelchair (202), based on attaching the second friction roller (306) to the wheelchair (202).
  • a method to convert a manual wheelchair (202) to an electronic wheelchair, the method comprising: operably connecting a joystick (102) to a communication unit (110); operably connecting the communication unit (110) to a motor (112); connecting an axle (114) to a rotor (116); connecting the motor (112) to the axle (114); configuring a retractable friction roller (104) with a centerless concave rim housing (1110) designed to provide a high friction surface (1105) when the friction roller (104) is placed facing and in contact with a wheel (206); mounting the retractable friction roller (104) on the axle (114); attaching to the wheelchair (202) in front of the wheel (206) and below the seating area (312) an engagement unit (106) configured to detachably attach the retractable friction roller (104) and the wheel (206); and operably connecting a power source (108) to the motor (112) and the joystick (102).
  • the method may further comprise configuring the engagement unit (106) with a lever (502); operably connecting the lever (502) to a lever mechanism unit (504); and operably connecting the lever mechanism unit (504) to a motor (112) bracket (704).
  • the method may further comprise operably connecting a second motor (302) to a second communication unit (304) and the power source (108), and operably connecting the second communication unit (304) to the joystick (102).
  • the method may further comprise configuring the joystick (102) to be operably programmable to generate commands for operating the motor (112) and the second motor (302).
  • the method may further comprise connecting the second motor (302) to a second axle (114), and connecting the second axle (114) to a second rotor (116).
  • the method may further comprise mounting a second retractable friction roller (306) on the second axle (114), and placing the second retractable friction roller (306) in contact with a second wheel (308) of the manual wheelchair (202).
  • the method may further comprise configuring the second retractable friction roller (306) with a centerless concave rim housing (1110) designed to provide a high friction surface (1105) facing the second wheel (308) of the manual wheelchair (202).
  • the method may further comprise attaching the second retractable friction roller (306) in front of the second wheel (308) and below the seating area (312).
  • the method may further comprise attaching a second engagement unit (310) to the manual wheelchair (202), wherein the second engagement unit (310) is configured to detachably attach the second retractable friction roller (306) and the second wheel (308) of the manual wheelchair (202).
  • the method may further comprise configuring the second engagement unit (310) with a second lever (502); operably connecting the second lever (502) to a second lever mechanism unit (504); and operably connecting the second lever mechanism unit (504) to a second motor (302) bracket (704).
  • the method may further comprise attaching the retractable friction roller (104) to the motor (112) and attaching the motor (112) to a bracket (704) operably coupled via a lever mechanism (504) with a lever (502) to releasably engage the friction roller (104) and a wheel (206) in response to operation of the lever (502).
  • the method may further comprise attaching the retractable friction roller (104) to the top of the wheel (206) behind the wheelchair (202) seating area (312).
  • the method may further comprise placing the retractable friction roller (104) in contact with a wheel (206) of the manual wheelchair (202).
  • a method to move a wheelchair (202) comprising: configuring a retractable friction roller (104) to releasably engage with a wheel (206) of a wheelchair (202), based on attaching the retractable friction roller (104) to the wheelchair (202); configuring the retractable friction roller (104) to drive when engaged the wheel (206) through a contact surface (1115) with the wheel (206) above the wheel (206) center and to the side of the wheelchair (202) seating area (312); configuring a motor (112) to rotate the retractable friction roller (104); and moving the wheelchair (202) based on engaging the retractable friction roller (104) and activating the motor (112) to turn the wheel (206) through force by the retractable friction roller (104) against the contact surface (1115) with the wheel (206).
  • the method may further comprise configuring a second motor (302) to rotate a second retractable friction roller (306) configured to drive a second wheel (308) through a contact surface (1115) with the second wheel (308) above the second wheel (308) center and to the side of the wheelchair (202) seating area (312), based on attaching the second retractable friction roller (306) to the wheelchair (202).
  • Attaching the second retractable friction roller (306) to the wheelchair (202) may further comprise attaching the second retractable friction roller (306) to the front of the second wheel (308) under the wheelchair (202) seating area (312).
  • Attaching the second retractable friction roller (306) to the wheelchair (202) may further comprise attaching the second retractable friction roller (306) to the second wheel (308) using an arm (204) of the wheelchair (202).
  • the method may further comprise folding the wheelchair (202) while the retractable friction roller (104) remains attached to the wheelchair (202) and the second retractable friction roller (306) remains attached to the wheelchair (202).
  • Attaching the retractable friction roller (104) to the wheelchair (202) may further comprise attaching the retractable friction roller (104) to the front of the wheel (206) under the wheelchair (202) seating area (312).
  • Attaching the retractable friction roller (104) to the wheelchair (202) may further comprise attaching the retractable friction roller (104) to the wheel (206) using an arm (204) of the wheelchair (202).
  • Apparatus and associated methods relate to a removable power assist for converting a manual wheelchair into an electronic wheelchair, based on configuring a friction roller to releasably engage with a wheelchair wheel, configuring the friction roller when engaged to drive the wheel through a contact surface with the wheel that may be positioned under the wheelchair seating area, or to the side of the wheelchair seating area, or to the underside of an armrest, or in front of a wheelchair wheel, configuring a motor to rotate the friction roller, and moving the wheelchair based on engaging the friction roller and activating the motor to turn the wheel through force by the friction roller against the contact surface with the wheel.
  • Some designs include a lever configured to permit a user seated in the wheelchair to engage or disengage the friction roller. Configuring the friction roller under the wheelchair seating area, or to the side of the wheelchair seating area, or behind the wheelchair seating area, or to the underside of an armrest, or in front of a wheelchair wheel may permit wheelchair folding or unfolding without uninstalling the power assist.
  • an exemplary apparatus kit may comprise: a first retractable friction roller configured to releasably engage with a wheelchair first wheel, wherein the first retractable friction roller includes a high friction surface configured on the first retractable friction roller to drive the wheelchair first wheel when the first retractable friction roller is engaged with the wheelchair first wheel through a contact surface with the wheelchair first wheel that is disposed behind a wheelchair seating area; a first engagement unit configured to be attached to a manual wheelchair, wherein the first engagement unit is configured to detachably attach the first retractable friction roller and the wheelchair first wheel; and a first motor configured to rotate the first retractable friction roller and move the manual wheelchair with force by the first retractable friction roller through the contact surface with the wheelchair first wheel.
  • the apparatus kit may further comprise a second retractable friction roller configured to releasably engage with a wheelchair second wheel, wherein the second retractable friction roller includes a high friction surface configured on the second retractable friction roller to drive the wheelchair second wheel when the second retractable friction roller is engaged with the wheelchair second wheel through a contact surface with the wheelchair second wheel that is disposed behind the wheelchair seating area; a second engagement unit configured to be attached to the manual wheelchair, wherein the second engagement unit is configured to detachably attach the second retractable friction roller and the wheelchair second wheel; and a second motor configured to rotate the second retractable friction roller and move the manual wheelchair with force by the second retractable friction roller through the contact surface with the wheelchair second wheel.
  • a second retractable friction roller configured to releasably engage with a wheelchair second wheel
  • the second retractable friction roller includes a high friction surface configured on the second retractable friction roller to drive the wheelchair second wheel when the second retractable friction roller is engaged with the wheelchair second wheel through a contact surface with the wheelchair second wheel that is disposed behind the wheelchair seating area
  • the apparatus kit may further comprise the contact surface with the wheelchair first wheel configured to be disposed above the wheelchair first wheel center.
  • the apparatus kit may further comprise the contact surface with the wheelchair second wheel configured to be disposed above the wheelchair second wheel center.
  • the apparatus kit may further comprise each of the first retractable friction roller and the second retractable friction roller configured with a centerless concave rim housing.
  • the apparatus kit may further comprise a joystick configured to be operably connected to at least one communication unit, wherein the at least one communication unit is configured to be operably connected to the first motor and the second motor, and wherein the joystick is configured to be operably programmable to generate commands for operating the first motor and the second motor; and a power source configured to be operably connected to the first motor, the second motor, and the joystick.
  • the apparatus kit may further comprise the contact surface with the wheelchair first wheel disposed above the wheelchair first wheel center, and wherein the contact surface with the wheelchair second wheel is disposed above the wheelchair second wheel center.
  • an exemplary apparatus kit may comprise: a joystick configured to operably connect to a communication unit, the communication unit configured to operably connect to a first motor; said first motor comprising a first axle configured to connect to a first rotor; a first retractable friction roller comprising a centerless concave rim housing configured to provide a high friction surface facing a wheelchair first wheel of a manual wheelchair; wherein said first retractable friction roller is configured to mount on the first axle and to contact the wheelchair first wheel of the manual wheelchair; a first engagement unit configured to attach to the manual wheelchair and to detachably attach the first retractable friction roller and the wheelchair first wheel; and a power source configured to operably connect to the first motor and the joystick.
  • the apparatus kit may further comprise a second motor configured to operably connect to the communication unit and the power source.
  • the apparatus kit may further comprise a second axle configured to connect to a second rotor.
  • the apparatus kit may further comprise a second retractable friction roller configured to mount on the second axle, and to contact a wheelchair second wheel of the manual wheelchair.
  • the apparatus kit may further comprise a second engagement unit configured to attach to the manual wheelchair to detachably attach the second friction roller and the wheelchair second wheel of the manual wheelchair.
  • the apparatus kit may further comprise a second centerless concave rim housing configured to provide a high friction surface facing the wheelchair second wheel of the manual wheelchair.
  • the joystick may be operably configured to generate commands for the first motor.
  • the j oy stick may be operably configured to generate commands for the second motor.
  • the first retractable friction roller may be configured to contact the wheelchair first wheel behind a seating area of the manual wheelchair.
  • the second retractable friction roller may be configured to contact the wheelchair second wheel behind a seating area of the manual wheelchair.
  • the apparatus kit may further comprise a first lever configured to operably connect to a first lever mechanism unit; said first lever mechanism unit configured to operably connect to a first turnbuckle; and said first turnbuckle is configured to operably connect to a first attachment unit.
  • the apparatus kit may further comprise a second lever configured to operably connect to a second lever mechanism unit; said second lever mechanism unit configured to operably connect to a second turnbuckle; and said second turnbuckle configured to operably connect to a second attachment unit.
  • the apparatus kit may further comprise a first spring-loaded unit configured to operably connect to the first retractable friction roller; and a first clamp configured to operably connect to the first spring-loaded unit.
  • the second attachment unit may further comprise: a second spring-loaded unit configured to operably connect to the second retractable friction roller; and a second clamp configured to operably connect to the second spring-loaded unit.
  • the apparatus kit may be configured with a plurality of friction rollers disposed to contact a single wheel. Tn such a design, the plurality of friction rollers may have respective contact surfaces configured to contact the single wheel at different respective contact surfaces with the single wheel.
  • an implementation may comprise first, second, third or more apparatus kits providing multiple points of contact on a single wheel wherein each apparatus kit is configured with a respective friction roller disposed to contact the wheel at different respective contact points between the friction rollers and the wheel.
  • an exemplary apparatus may comprise: a first friction roller (104) operably coupled with a first engagement member (704), wherein the first friction roller (104) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a first motor (112) operably coupled with the first friction roller (104); and a first engagement actuator (1200) connected to a first attachment member (508), wherein the first engagement actuator (1200) comprises a movable shaft (1330) configured to move the first engagement member (704) relative to the first attachment member (508) between a disengaged position wherein the first friction roller (104) is not in contact with a wheelchair (202) first wheel (206) and an engaged position wherein the first friction roller (104) is in contact with the wheelchair (202) first wheel (206) at a point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206), wherein the point of contact (1115) is disposed behind a seating area (312) of the wheelchair (202), wherein the movable shaft (1330) configured to
  • the apparatus may further comprise the first attachment member (508) is removably secured to the wheelchair (202) to position the first friction roller (104) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) first wheel (206) by force from the first motor (112) through the point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206) when the first engagement member (704) is in the engaged position.
  • first attachment member (508) is removably secured to the wheelchair (202) to position the first friction roller (104) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) first wheel (206) by force from the first motor (112) through the point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206) when the first engagement member (704) is in the engaged position.
  • the apparatus may further comprise: a second friction roller (306) operably coupled with a second engagement member (704), wherein the second friction roller (306) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a second motor (302) operably coupled with the second friction roller (306); and a second engagement actuator (1200) connected to a second attachment member (508), wherein the second engagement actuator (1200) comprises a movable shaft (1330) configured to move the second engagement member (704) relative to the second attachment member (508) between a disengaged position wherein the second friction roller (306) is not in contact with the wheelchair (202) second wheel (308) and an engaged position wherein the second friction roller (306) is in contact with the wheelchair (202) second wheel (308) at a point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wdieel (308) and wherein the point of contact (1115) is disposed behind the seating area (312) of the wheelchair (202).
  • the apparatus may further comprise the second attachment member (508) is removably secured to the w heel chair (202) to position the second friction roller (306) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) second wheel (308) by force from the second motor (302) through the point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) when the second engagement member (704) is in the engaged position.
  • the second attachment member (508) is removably secured to the w heel chair (202) to position the second friction roller (306) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) second wheel (308) by force from the second motor (302) through the point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) when the second engagement member (704) is in the engaged position.
  • the apparatus may further comprise the movable shaft (1330) connected to the first engagement member (704), wherein the movable shaft (1330) is extendable and retractable and configured to move the first engagement member (704) relative to the first attachment member (508) based on extending or retracting the movable shaft (1330).
  • the apparatus may further comprise the first motor (112) operably coupled by a first axle (114) with the first friction roller (104).
  • the apparatus may further comprise the first motor (112) operably coupled by a first rotor (116) with the first axle (114).
  • the first attachment member (508) may be a bracket having a first end (1335), a second end (1340), and a length between the first end (1335) and the second end (1340), and wherein the first attachment bracket (508) is removably secured to the wheelchair (202).
  • the first engagement member (704) may be a bracket having a first end (1345), a second end (1350), and a length between the first end (1345) and the second end (1350), and wherein the first engagement bracket (704) is operably coupled with the first attachment bracket (508).
  • the first attachment bracket (508) may be disposed substantially horizontally and parallel with respect to a surface on which the wheelchair (202) would rest.
  • the first attachment bracket (508) may be disposed substantially vertically and perpendicular with respect to a surface on which the wheelchair (202) would rest.
  • the first attachment bracket (508) first end (1335) may be removably secured by a clamp (1305) to the wheelchair (202).
  • the first attachment bracket (508) second end (1340) may be removably secured by a collar (1315) to the wheelchair (202).
  • the collar (1315) may be coupled by an adapter plate (1320) with the first engagement actuator (1200) and the movable shaft (1330) may be coupled with the first engagement bracket (704), wherein the adapter plate (1320) may have a planar surface disposed in a plane substantially parallel to the first attachment bracket (508) length.
  • the collar (1315) may comprise at least one half-collar (1315).
  • the collar (1315) may have a central opening having a central axis disposed substantially parallel with the first attachment bracket (508) length.
  • the collar (1315) may have a central opening with a central axis disposed substantially perpendicular with the first attachment bracket (508) length.
  • the collar (1315) may be connected to a structural member of the wheelchair (202) that is substantially horizontal and parallel with respect to a surface on which the wheelchair (202) would rest.
  • the collar (1315) may be connected to a structural member of the wheelchair (202) that is substantially vertical and perpendicular with respect to a surface on which the wheelchair (202) would rest.
  • the first engagement bracket (704) length may be approximately the first attachment bracket (508) length.
  • the first engagement bracket (704) length may be not more than half the first attachment bracket (508) length.
  • the first engagement bracket (704) length may be any length relative to the first attachment bracket (508) length.
  • the first engagement bracket (704) first end (1345) may be rotatably coupled with the first attachment bracket (508) to displace the first engagement bracket (704) second end (1350) away from the first attachment bracket (508) as the first engagement bracket (704) moves to the engaged position.
  • the first engagement bracket (704) first end (1345) may be rotatably coupled with the first attachment bracket (508) to rotate about the first attachment bracket (508) first end (1335).
  • the first engagement bracket (704) first end (1345) may be rotatably coupled with the first attachment bracket (508) at a point between the first attachment bracket (508) first end (1335) and the first attachment bracket (508) second end (1340) to rotate about said point.
  • the first engagement bracket (704) may be configured with a slot adapted to subsume a portion of the first attachment bracket (508) wherein the first engagement bracket (704) slides along the first attachment bracket (508) length as the first engagement bracket (704) moves relative to the first attachment bracket (508).
  • the first engagement actuator (1200) and the second engagement actuator (1200) may be linear actuators.
  • the apparatus may further comprise a second movable shaft (1330) connected to the second engagement member (704), wherein the second movable shaft (1330) is extendable and retractable and configured to move the second engagement member (704) relative to the second attachment member (508) based on extending or retracting the second movable shaft (1330).
  • the apparatus may further comprise the second motor (302) operably coupled by a second axle (114) with the second friction roller (306).
  • the apparatus may further comprise the second motor (302) operably coupled by a second rotor (116) with the second axle (114).
  • the second attachment member (508) may be a bracket having a first end (1335), a second end (1340), and a length between the first end (1335) and the second end (1340), and wherein the second attachment bracket (508) is removably secured to the wheelchair (202).
  • the second engagement member (704) may be a bracket having a first end (1345), a second end (1350), and a length between the first end (1345) and the second end (1350), and wherein the second engagement bracket (704) is operably coupled with the second attachment bracket (508).
  • the second attachment bracket (508) may be disposed substantially horizontally and parallel with respect to a surface on which the wheelchair (202) would rest.
  • the second attachment bracket (508) may be disposed substantially vertically and perpendicular with respect to a surface on which the wheelchair (202) would rest.
  • the second attachment bracket (508) first end (1335) may be removably secured by a clamp (1305) to the wheelchair (202).
  • the clamp (1305) may be a spring, screw clamp, mechanical coupling, latch, rod clamp, rail clamp, light, round center mount, mount bracket, pole clamp, pipe clamp, quick release clamp, rack clamp mount, bolt, screw, handlebar clamp mount, or other suitable fastener as may be known to one of skill in the art.
  • the second attachment bracket (508) second end (1340) may be removably secured by a collar (1315) to the wheelchair (202).
  • the collar (1315) may be coupled by a second adapter plate (1320) with the second engagement actuator (1200) and the second movable shaft (1330) may be coupled with the second engagement bracket (704), wherein the second adapter plate (1320) has a planar surface disposed in a plane substantially parallel to the second attachment bracket (508) length.
  • the collar (1315) may comprise at least one half-collar (1315).
  • the collar (1315) may further comprise a central opening having a central axis disposed substantially parallel with the second attachment bracket (508) length.
  • the collar (1315) may further comprise a central opening with a central axis disposed substantially perpendicular with the second attachment bracket (508) length.
  • the collar (1315) may be connected to a structural member of the wheelchair (202) that is substantially horizontal and parallel with respect to a surface on which the wheelchair (202) would rest.
  • the collar (1315) may be connected to a structural member of the wheelchair (202) that is substantially vertical and perpendicular with respect to a surface on which the wheelchair (202) would rest.
  • the second engagement bracket (704) length may be approximately the second attachment bracket (508) length.
  • the second engagement bracket (704) length may be not more than half the second attachment bracket (508) length.
  • the second engagement bracket (704) length may be any length relative to the second attachment bracket (508) length.
  • the second engagement bracket (704) first end (1345) may be rotatably coupled with the second attachment bracket (508) to displace the second engagement bracket (704) second end (1350) away from the second attachment bracket (508) as the second engagement bracket (704) moves to the engaged position.
  • the second engagement bracket (704) second end (1345) may be rotatably coupled with the second attachment bracket (508) to rotate about the second attachment bracket (508) first end (1335).
  • the second engagement bracket (704) second end (1345) may be rotatably coupled with the second attachment bracket (508) at a point between the second attachment bracket (508) first end (1335) and the second attachment bracket (508) second end (1340) to rotate about said point.
  • the second engagement bracket (704) may be configured with a slot adapted to subsume a portion of the second attachment bracket (508) wherein the second engagement bracket (704) slides along the second attachment bracket (508) length as the second engagement bracket (704) moves relative to the second attachment bracket (508).
  • the apparatus may further comprise a programmable joystick (102) configured to govern the operation of the first motor (112) and the second motor (302).
  • the apparatus may further comprise an engage button configured to activate the first engagement actuator (1200) and the second engagement actuator (1200) and thereby move the first engagement member (704) and the second engagement member (704).
  • the engage button may be configured on the wheelchair (202) in a location accessible to a user seated in the wheelchair 202 seating area (312).
  • the engage button may be configured in an arm (204) of the wheelchair (202).
  • the engage button may be configured with a wireless connection to an engagement actuator electrical connection (2210) designed to control one or more engagement actuator (1200).
  • the apparatus may further comprise an electrical power source configured to operably power the first engagement actuator (1200), the second engagement actuator (1200), the first motor (112), the second motor (302), and the engage button.
  • the apparatus may further comprise an electrical power source configured to operably power the first engagement actuator (1200), the second engagement actuator (1200), the first motor (112), the second motor (302), the engage button, and a programmable joystick (102).
  • the apparatus may further comprise an electrical power source configured to operably power the first engagement actuator (1200), the second engagement actuator (1200), the first motor (112), the second motor (302), the engage button, a programmable joystick (102), a communication unit 110, and a second communication unit 304.
  • an electrical power source configured to operably power the first engagement actuator (1200), the second engagement actuator (1200), the first motor (112), the second motor (302), the engage button, a programmable joystick (102), a communication unit 110, and a second communication unit 304.
  • the electrical power source may be a battery.
  • the battery may be rechargeable.
  • the rotational movement of the apparatus may charge the battery.
  • the rechargeable battery may be recharged using electric energy harvested by a generator powered by rotation of one or more wheelchair wheel.
  • the rechargeable battery may be recharged using electric energy from a generator powered by one or more wheelchair wheel rotating while the one or more wheelchair wheel is in contact with a surface supporting the wheelchair.
  • the rechargeable battery may be recharged using electric energy harvested from solar energy.
  • the solar energy may be supplied by one or more solar cell configured in the wheelchair.
  • the solar energy may be supplied by one or more solar panel not attached to the wheelchair.
  • the one or more solar panel may be a portable solar charging station.
  • the one or more solar panel may comprise a solar panel external to the wheelchair, said wheelchair configured to operably connect to the solar panel to charge the battery.
  • the solar panel may be operably connected to the wheelchair.
  • the wheelchair (202) may be a foldable wheelchair, and the apparatus may further comprise an open space (1005) located behind the seating area (312) of the foldable wheelchair (202), and wherein the first motor (112), the first attachment member (508), the first engagement member (704), the second motor (302), the second attachment member (508) and the second engagement member (704) remain attached to the foldable wheelchair (202) when the foldable wheelchair (202) is in a folded or unfolded configuration.
  • An exemplary apparatus may comprise: a first friction roller (104) operably coupled with a first engagement member (704), wherein the first friction roller (104) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a first motor (112) operably coupled with the first friction roller (104); and a first engagement actuator (1200) configured to be connected to a wheelchair (202), wherein the first engagement actuator (1200) comprises a movable shaft (1330) configured to move the first engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the first friction roller (104) is not in contact with a wheelchair (202) first wheel (206) and an engaged position wherein the first friction roller (104) is in contact with the wheelchair (202) first wheel (206) at a point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206), wherein the point of contact (1115) is disposed behind a seating area (312) of the wheelchair (202), wherein the movable shaft (1330) is
  • the apparatus may further comprise the first engagement member (704) is configured to be removably secured to a first exchange tab (2300) configured to be welded to the wheelchair (202) to position the first friction roller (104) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) first wheel (206) by force from the first motor (112) through the point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206) when the first engagement member (704) is in the engaged position.
  • a first exchange tab (2300) configured to be welded to the wheelchair (202) to position the first friction roller (104) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) first wheel (206) by force from the first motor (112) through the point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206) when the first engagement member (704) is in the engaged position.
  • the apparatus may further comprise: a second friction roller (306) operably coupled with a second engagement member (704), wherein the second friction roller (306) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a second motor (302) operably coupled with the second friction roller (306); and a second engagement actuator (1200) configured to be connected to the wheelchair (202), wherein the second engagement actuator (1200) comprises a movable shaft (1330) configured to move the second engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the second friction roller (306) is not in contact with the wheelchair (202) second wheel (308) and an engaged position wherein the second friction roller (306) is in contact with the wheelchair (202) second wheel (308) at a point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) and wherein the point of contact (1115) is disposed behind the seating area (312) of the wheelchair (202).
  • the apparatus may further comprise the second engagement member (704) is configured to be removably secured to a second exchange tab (2300) configured to be welded to the wheelchair (202) to position the second friction roller (306) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) second wheel (308) by force from the second motor (302) through the point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) when the second engagement member (704) is in the engaged position.
  • a second exchange tab (2300) configured to be welded to the wheelchair (202) to position the second friction roller (306) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) second wheel (308) by force from the second motor (302) through the point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) when the second engagement member (704) is in the engaged position.
  • the apparatus may further comprise the first motor (112) operably coupled by an axle (114) with the first friction roller (104).
  • the apparatus may further comprise the first motor (112) operably coupled by a rotor (116) with the axle (114).
  • the apparatus may further comprise the second motor (302) operably coupled by an axle (114) with the second friction roller (306).
  • the apparatus may further comprise the second motor (302) operably coupled by a rotor (116) with the axle (114).
  • the first engagement member (704) may be a bracket having a first end (1345), a second end (1350), and wherein the first engagement bracket (704) is configured to be removably secured with the first exchange tab (2300).
  • the first engagement member (704) first end (1345) may be removably secured to the first exchange tab (2300).
  • the first exchange tab (2300) may be welded to the wheelchair (202).
  • the first engagement member (704) second end (1350) may be operably coupled by a collar (1315) to the wheelchair (202).
  • the collar (1315) may be coupled by an adapter plate (1320) with the first engagement actuator (1200) and the movable shaft (1330) is coupled with the first engagement member (704) second end (1350).
  • the collar (1315) may be connected to a structural member of the wheelchair (202) that is substantially horizontal and parallel with respect to a surface on which the wheelchair (202) would rest.
  • the first engagement member (704) first end (1345) may be rotatably coupled with the first exchange tab (2300) to rotate about the first engagement member (704) first end (1345).
  • the second engagement member (704) may be a bracket having a first end (1345), a second end (1350), and wherein the second engagement bracket (704) is configured to be removably secured with the second exchange tab (2300).
  • the second engagement member (704) first end (1345) may be removably secured to the second exchange tab (2300).
  • the second exchange tab (2300) may be welded to the wheelchair (202).
  • the second engagement member (704) second end (1350) may be operably coupled by a collar (1315) to the wheelchair (202).
  • the collar (1315) may be coupled by an adapter plate (1320) with the second engagement actuator (1200) and the movable shaft (1330) is coupled with the second engagement member (704) second end (1350).
  • the collar (1315) may be connected to a structural member of the wheelchair (202) that is substantially horizontal and parallel with respect to a surface on which the wheelchair (202) would rest.
  • the second engagement member (704) first end (1345) may be rotatably coupled with the second exchange tab (2300) to rotate about the second engagement member (704) first end (1345).
  • the first engagement actuator (1200) and the second engagement actuator (1200) may be linear actuators.
  • the apparatus may further comprise a programmable joystick (102) configured to govern the operation of the first motor (112) and the second motor (302).
  • the apparatus may further comprise an engage button configured to activate the first engagement actuator (1200) and the second engagement actuator (1200) and thereby move the first engagement member (704) and the second engagement member (704).
  • the apparatus may further comprise an electrical power source configured to operably power the first engagement actuator (1200), the second engagement actuator (1200), the first motor (112), the second motor (302), and the engage button.
  • the wheelchair (202) may be a foldable wheelchair, and the apparatus may further comprise an open space (1005) located behind the seating area (312) of the foldable wheelchair (202), and wherein the first motor (112), the first exchange tab (2300), the first engagement member (704), the second motor (302), the second exchange tab (704) and the second engagement member (704) remain attached to the foldable wheelchair (202) when the foldable wheelchair (202) is in a folded or unfolded configuration.
  • the apparatus may comprise an encoded digital identification is embedded within the first engagement member (704), and wherein the digital identification is stored in a database associated with a digital identification of a user of the apparatus.
  • the apparatus may further comprise an encoded digital identification embedded within the first exchange tab (2300), and wherein the digital identification is stored in a database associated with a digital identification of a user of the apparatus.
  • the apparatus encoded digital identification is embedded within the first engagement member (704), wherein the encoded digital identification is embedded within the first exchange tab (2300), and wherein the digital identification is stored in a database associated with a digital identification of a user of the apparatus.
  • the apparatus may comprise an encoded digital identification is embedded within the second engagement member (704), and wherein the digital identification is stored in a database associated with a digital identification of a user of the apparatus.
  • the apparatus may further comprise an encoded digital identification embedded within the second exchange tab (2300), and wherein the digital identification is stored in a database associated with a digital identification of a user of the apparatus.
  • the apparatus encoded digital identification is embedded within the second engagement member (704), wherein the encoded digital identification is embedded within the second exchange tab (2300), and wherein the digital identification is stored in a database associated with a digital identification of a user of the apparatus.
  • An exemplary apparatus kit may comprise: a first friction roller (104) configured to be operably coupled with a first engagement member (704), wherein the first friction roller (104) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a first motor (112) configured to be operably coupled with the first friction roller (104); and a first engagement actuator (1200) configured to be connected to a wheelchair (202), wherein the first engagement actuator (1200) comprises a movable shaft (1330) configured to move the first engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the first friction roller (104) is not in contact with a wheelchair (202) first wheel (206) and an engaged position wherein the first friction roller (104) is in contact with the wheelchair (202) first wheel (206) at a point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206), wherein the point of contact (1115) is disposed behind a seating area (312) of the wheelchair (202), wherein the first friction roller (10
  • the apparatus kit may further comprise the first engagement member (704) configured to be removably secured to the wheelchair (202) to position the first friction roller (104) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) first wheel (206) by force from the first motor (112) through the point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206) when the first engagement member (704) is in the engaged position.
  • the first engagement member (704) configured to be removably secured to the wheelchair (202) to position the first friction roller (104) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) first wheel (206) by force from the first motor (112) through the point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206) when the first engagement member (704) is in the engaged position.
  • the apparatus kit may further comprise a second friction roller (306) configured to be operably coupled with a second engagement member (704), wherein the second friction roller (306) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a second motor (302) configured to be operably coupled with the second friction roller (306); and a second engagement actuator (1200) configured to be connected to the wheelchair (202), wherein the second engagement actuator (1200) comprises a movable shaft (1330) configured to move the second engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the second friction roller (306) is not in contact with the wheelchair (202) second wheel (308) and an engaged position wherein the second friction roller (306) is in contact with the wheelchair (202) second wheel (308) at a point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) and wherein the point of contact (1115) is disposed behind the seating area (312) of the wheelchair (202).
  • the second friction roller (306) comprises a centerless con
  • the apparatus kit may further comprise the second engagement member (704) configured to be removably secured to the wheelchair (202) to position the second friction roller (306) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) second wheel (308) by force from the second motor (302) through the point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) when the second engagement member (704) is in the engaged position.
  • the second engagement member (704) configured to be removably secured to the wheelchair (202) to position the second friction roller (306) centerless concave rim housing (1110) friction surface (1105) to drive the wheelchair (202) second wheel (308) by force from the second motor (302) through the point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) when the second engagement member (704) is in the engaged position.
  • the first engagement member (704) may have a first end (1345) and a second end (1350).
  • the first engagement member (704) first end (1345) may be configured to be removably secured to the wheelchair (202).
  • the first engagement member (704) first end (1345) may be configured to be rotatably coupled with the wheelchair (202) to rotate about the first engagement member (704) first end (1345).
  • the first engagement member (704) second end (1350) may be configured to be operably coupled by a collar (1315) to the wheelchair (202).
  • the collar (1315) may be configured to be coupled by an adapter plate (1320) with the first engagement actuator (1200) and the movable shaft (1330) is configured to be coupled with the first engagement member (704) second end (1350).
  • the first engagement member (704) may be configured to be removably secured to a first exchange tab (2300) configured to be removably secured to the wheelchair (202).
  • the first exchange tab (2300) may be permanently secured to the wheelchair (202).
  • the first engagement member (704) may be configured to be removably secured to a first attachment member (508) configured to be removably secured to the wheelchair (202).
  • the second engagement member (704) may have a first end (1345) and a second end
  • the second engagement member (704) first end (1345) may be configured to be removably secured to the wheelchair (202).
  • the second engagement member (704) first end (1345) may be configured to be rotatably coupled with the wheelchair (202) to rotate about the second engagement member (704) first end (1345).
  • the second engagement member (704) second end (1350) may be configured to be operably coupled by a collar (1315) to the wheelchair (202).
  • the collar (1315) may be configured to be coupled by an adapter plate (1320) with the second engagement actuator (1200) and the movable shaft (1330) is configured to be coupled with the second engagement member (704) second end (1350).
  • the second engagement member (704) may be configured to be removably secured to a second exchange tab (2300) configured to be removably secured to the wheelchair (202).
  • the second exchange tab (2300) may be permanently secured to the wheelchair (202).
  • the second engagement member (704) may be configured to be removably secured to a second attachment member (508) configured to be removably secured to the wheelchair (202).
  • the first engagement actuator (1200) and the second engagement actuator (1200) may be linear actuators.
  • the apparatus kit may further comprise a programmable joystick (102) configured to govern operation of the first motor (112) and the second motor (302).
  • the apparatus kit may further comprise an engage button configured to activate the first engagement actuator (1200) and the second engagement actuator (1200) and thereby move the first engagement member (704) and the second engagement member (704).
  • the apparatus kit may further comprise an electrical power source configured to operably power the first engagement actuator (1200), the second engagement actuator (1200), the first motor (112), the second motor (302), and the engage button.
  • the apparatus kit may further comprise: wherein the wheelchair (202) may be a foldable wheelchair (202), and wherein the apparatus kit when installed on the foldable wheelchair (202) defines an open space (1005) located behind the seating area (312) of the foldable wheelchair (202), and wherein the first motor (112), the first engagement member (704), the second motor (302) and the second engagement member (704) remain attached to the foldable wheelchair (202) when the foldable wheelchair (202) is in a folded or unfolded configuration.
  • the apparatus kit may further comprise an encoded digital identification embedded within at least one of the first engagement member (704) or the second engagement member (704), and wherein the encoded digital identification is associated in a database with a digital identification of an apparatus kit user.
  • the apparatus kit may further comprise at least one exchange tab (2300), wherein an encoded digital identification is embedded within the at least one exchange tab (2300), and wherein the encoded digital identification is associated in a database with a digital identification of an apparatus kit user.
  • An exemplary method may comprise: configuring a first friction roller (104) with a centerless concave rim housing (1110) comprising a friction surface (1105); configuring the first friction roller (104) to be operably coupled with a first engagement member (704), configuring a first motor (112) to be operably coupled with the first friction roller (104); configuring a first engagement actuator (1200) to be connected to a wheelchair (202); configuring the first engagement actuator (1200) with a first movable shaft (1330) configured to move the first engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the first friction roller (104) is not in contact with a wheelchair (202) first wheel (206) and an engaged position wherein the first friction roller (104) is in contact with the wheelchair (202) first wheel (206) at a point of contact (1115) between the first friction roller (104) friction surface (1105) and the wheelchair (202) first wheel (206), and wherein the point of contact (1115) is disposed behind a seating area (312) of the wheelchair (202); con
  • the method may further comprise: configuring a second friction roller (306) with a centerless concave rim housing (1110) comprising a friction surface (1105); configuring the second friction roller (306) to be operably coupled with a second engagement member (704), configuring a second motor (302) to be operably coupled with the second friction roller (306); configuring a second engagement actuator (1200) to be connected to a wheelchair (202); configuring the second engagement actuator (1200) with a second movable shaft (1330) configured to move the second engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the second friction roller (306) is not in contact with a wheelchair (202) second wheel (308) and an engaged position wherein the second friction roller (306) is in contact with the wheelchair (202) second wheel (308) at a point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) and wherein the point of contact (1115) is disposed behind the seating area (312) of the wheelchair (202); configuring the second friction roller (306)
  • the method may further comprise configuring an engage button to activate the first engagement actuator (1200) and the second engagement actuator (1200) and thereby move the first engagement member (704) and the second engagement member (704).
  • An exemplary method may comprise: converting a manual wheelchair (202) to a power assisted wheelchair (202) by attaching a first power assist device (100) onto the manual wheelchair (202), the first power assist device (100) comprising: a first friction roller (104) configured to be operably coupled with a first engagement member (704), wherein the first friction roller (104) comprises a centerless concave rim housing (1110) comprising a friction surface (1105); a first motor (112) configured to be operably coupled with the first friction roller (104); and a first engagement actuator (1200) configured to be connected to a wheelchair (202), wherein the first engagement actuator (1200) comprises a movable shaft (1330) configured to move the first engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the first friction roller (104) is not in contact with a wheelchair (202) first wheel (206) and an engaged position wherein the first friction roller (104) is in contact with the wheelchair (202) first wheel (206) at a point of contact (1115) between the first friction roller (104)
  • the method may further comprise attaching a second power assist device (100) onto the manual wheelchair (202), the second power assist device (100) comprising: a second friction roller (306) configured to be operably coupled with a second engagement member (704), wherein the second friction roller (306) comprises a centerless concave nm housing (1110) comprising a friction surface (1105); a second motor (302) configured to be operably coupled with the second friction roller (306); and a second engagement actuator (1200) configured to be connected to the wheelchair (202), wherein the second engagement actuator (1200) comprises a movable shaft (1330) configured to move the second engagement member (704) relative to the wheelchair (202) between a disengaged position wherein the second friction roller (306) is not in contact with the wheelchair (202) second wheel (308) and an engaged position wherein the second friction roller (306) is in contact with the wheelchair (202) second wheel (308) at a point of contact (1115) between the second friction roller (306) friction surface (1105) and the wheelchair (202) second wheel (308) and wherein the point of contact
  • An exemplary wheelchair power assist apparatus or method implementation in accordance with the teaching of the present disclosure may comprise releasably attaching a wheelchair power assist to a wheelchair using an exchange tab welded to the wheelchair frame.
  • An exemplary implementation may comprise a wheelchair welded to an exchange tab configured to be rotatably coupled with an engagement member.
  • the engagement member may be configured with a movable shaft implemented to move the engagement member relative to the wheelchair as the movable shaft extends or retracts using an engagement actuator. Extending or retracting the movable shaft when the exchange tab is secured to a wheelchair may move the engagement bracket between a disengaged position wherein a friction roller is not in contact with a wheelchair wheel and an engaged position wherein the friction roller is in contact with a wheelchair wheel.
  • an exchange tab welded to the wheelchair frame may expand a user’s access to wheelchair transportation and permit a user increased freedom to travel.
  • An exemplary exchange tab may be secured to a wheelchair using various techniques that would be known to one of ordinary skill. For example, in addition to or instead of the tab being welded to the wheelchair, an exemplary tab may be glued, screwed, riveted or nailed to the wheelchair. In some implementations the exchange tab may be replaced by a slide together mechanism or a ball mount. Various implementations of the exchange tab mechanism are contemplated as may be known to one of ordinary skill.
  • An exemplary apparatus or method implementation in accordance with the teaching of the present disclosure may relate to a removable power assist for converting a manual wheelchair into an electronic wheelchair, based on configuring a friction roller to releasably engage with a wheelchair wheel, configuring the friction roller when engaged to drive the wheel through a contact surface with the wheel that may be positioned under the wheelchair seating area, or to the side of the wheelchair seating area, or to the underside of an armrest, or in front of a wheelchair wheel, configuring a motor to rotate the friction roller, and moving the wheelchair based on engaging the friction roller and activating the motor to turn the wheel through force by the friction roller against the contact surface with the wheel.
  • Some designs include a lever configured to permit a user seated in the wheelchair to engage or disengage the friction roller. Configuring the friction roller under the wheelchair seating area, or to the side of the wheelchair seating area, or to the underside of an armrest, or in front of a wheelchair wheel may permit wheelchair folding or unfolding without uninstalling the power assist.
  • An exemplary apparatus or method implementation in accordance with the teaching of the present disclosure may relate to a removable power assist for converting a manual wheelchair into an electronic wheelchair, based on configuring a friction roller to releasably engage with a wheelchair wheel, configuring the friction roller when engaged to drive the wheel through a contact surface with the wheel above the wheel center and behind the wheelchair seating area, configuring a motor to rotate the friction roller, and moving the wheelchair based on engaging the friction roller and activating the motor to turn the wheel through force by the friction roller against the contact surface with the wheel.
  • the power assist may include a user-operable lever configured to engage or disengage the friction roller without a user leaving their seated position in the wheelchair. Configuring the friction roller above the wheel center and behind the wheelchair seating area may permit collapsible wheelchair folding or unfolding without uninstalling the power assist.
  • the device may include a joystick, a communication unit, a motor, a retractable friction roller, an engagement unit and a power source.
  • the joystick may be operably connected to a communication unit.
  • the communication unit may be operably connected to a motor.
  • the motor may include an axle connected to a rotor.
  • the retractable friction roller may be mounted on the axle. The roller may be placed in contact with a wheel of a manual wheelchair.
  • the engagement unit may be attached to the manual wheelchair to detachably attach the friction roller and the wheel.
  • the power source may be operably connected to the motor and the joystick.
  • a device for converting a manual wheelchair into an electronic wheelchair is provided.
  • a manual wheelchair accessory device configured to attach to a manual wheelchair that will convert the manual wheelchair to an electric wheelchair, while still retaining the advantages that manual wheelchairs provide.
  • the device may include an attachable power source affixed to a standard manual wheelchair.
  • the present invention provides a device having a joystick, a communication unit, a motor, a retractable friction roller, an engagement unit and a power source.
  • the joystick is operably connected to a communication unit.
  • the communication unit is operably connected to a motor.
  • the motor includes an axle connected to a rotor.
  • a retractable friction roller is mounted on the axle. The roller is placed in contact with a wheel of a manual wheelchair.
  • the engagement unit is attached to the manual wheelchair to detachably attach the friction roller to the wheel.
  • the power source is operably connected to the motor and the joystick.
  • the present invention provides a second motor that is operably connected to a second communication unit and the power source.
  • the second communication unit is operably connected to the joystick.
  • the second motor includes a second axle connected to a second rotor.
  • This embodiment includes a second friction roller that is mounted on the second axle. The second roller is placed in contact with a second wheel of the manual wheelchair to facilitate powered motion.
  • the joystick may be operably connected to the rotors and is operably programmable to generate commands for the motors.
  • the present invention easily converts a manual wheelchair to a powered, smart wheelchair.
  • Features of the present invention include 1) using the friction roller's contact to the wheel to generate directed movement; 2) the ability to engage and disengage the friction roller to the wheels of the wheelchair which allows the user to propel the wheelchair with manual propulsion while the device is still attached to the wheelchair— a feature essential if the battery or motor cease to function; 3) the ability to fold the wheelchair with device attached to it without altering the folding of or normal space occupied by a standard manual wheelchair; 4) unit portability.
  • the device includes a safety guard to prevent a user's fingers from becoming caught in the motor or the gears.
  • the motors are bi-directional and independent of one another so that the motor attached to each wheelchair wheel can turn the opposite direction and rotate the wheelchair in place.
  • both acute and long-term care wheelchair companies and individual users can affordably bring their equipment and standard of care to a higher, professional level.
  • various features may be described as being optional, for example, through the use of the verb “may;” or, through the use of any of the phrases: “in some implementations,” “in some designs,” “in various implementations,” “in various designs,” “in an illustrative example,” or, “for example.”
  • the present disclosure does not explicitly recite each and every permutation that may be obtained by choosing from the set of optional features.
  • the present disclosure is to be interpreted as explicitly disclosing all such permutations.
  • a system described as having three optional features may be implemented in seven different ways, namely with just one of the three possible features, with any two of the three possible features or with all three of the three possible features.
  • any method or apparatus implementation may be devoid of one or more process steps or components.
  • implementations employing negative limitations are expressly disclosed and considered a part of this disclosure.
  • the defined steps can be carried out in any order or simultaneously (except where the context excludes that possibility), and the method can include one or more other steps which are carried out before any of the defined steps, between two of the defined steps, or after all the defined steps (except where the context excludes that possibility).

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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)
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Abstract

Un appareil selon l'invention et des procédés associés concernent un dispositif d'assistance électrique de fauteuil roulant configuré pour être monté, démonté ou échangé indépendamment d'un fauteuil roulant. Le dispositif peut faire commuter un galet à friction motorisé entre des modes en prise et hors prise avec une roue de fauteuil roulant, sur la base d'un actionneur de mise en prise configuré pour déplacer le galet à friction par rapport au fauteuil roulant. Un raccord mâle peut permettre de fixer ou d'échanger le dispositif indépendamment du fauteuil roulant. Le galet à friction peut être couplé de manière fonctionnelle à un élément de mise en prise configuré pour se déplacer par rapport au fauteuil roulant. L'élément de mise en prise peut être déplacé par un arbre d'actionnement extensible et rétractable couplé au fauteuil roulant. Un fauteuil roulant manuel peut être converti en un fauteuil roulant électrique à l'aide d'un galet à friction motorisé pour chaque roulette de fauteuil roulant tout en laissant un espace ouvert derrière la zone d'assise du fauteuil roulant, permettant avantageusement aux dispositifs d'assistance électrique de rester fixés à un fauteuil roulant pliable dans les configurations pliée ou dépliée.
PCT/US2023/063749 2022-03-16 2023-03-05 Assistance électrique universelle pour fauteuil roulant WO2023177987A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US17/696,842 2022-03-16
US17/696,842 US11523951B2 (en) 2018-04-27 2022-03-16 Portable power assist for manual wheelchairs
US17/984,077 US11660241B2 (en) 2018-04-27 2022-11-09 Exchangeable universal wheelchair power assist
US17/984,077 2022-11-09

Publications (1)

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WO2023177987A1 true WO2023177987A1 (fr) 2023-09-21

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786887A (en) * 1972-03-20 1974-01-22 B Rosenthal Motorized wheel chair drive
US6547018B1 (en) * 1999-04-02 2003-04-15 Su-Gil Choi Transmission for wheelchair
US20060096792A1 (en) * 2004-11-05 2006-05-11 Boris Usherovich Mobility device
US20070284845A1 (en) * 2004-05-12 2007-12-13 Roovers Gijsbertus F Wheel Chair with Drive Support and Force Sensor for Use Therewith
US20220000687A1 (en) * 2018-04-27 2022-01-06 Roda Futura ,Llc Removable power assist for manual wheelchair
US20230071167A1 (en) * 2018-04-27 2023-03-09 Roda Futura, Llc Exchangeable universal wheelchair power assist

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3786887A (en) * 1972-03-20 1974-01-22 B Rosenthal Motorized wheel chair drive
US6547018B1 (en) * 1999-04-02 2003-04-15 Su-Gil Choi Transmission for wheelchair
US20070284845A1 (en) * 2004-05-12 2007-12-13 Roovers Gijsbertus F Wheel Chair with Drive Support and Force Sensor for Use Therewith
US20060096792A1 (en) * 2004-11-05 2006-05-11 Boris Usherovich Mobility device
US20220000687A1 (en) * 2018-04-27 2022-01-06 Roda Futura ,Llc Removable power assist for manual wheelchair
US20230071167A1 (en) * 2018-04-27 2023-03-09 Roda Futura, Llc Exchangeable universal wheelchair power assist

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