Abstract: A shock absorbing suspension for the large rear wheels of a wheelchair is disclosed. A fork element is hinged at one end to a clamping member which attaches to a horizontal frame member of the wheelchair. A cylindrical solid polymer shock absorber cushions the movement of the fork element toward the clamping member. The free end of the fork element includes an axleway for the axle of a large wheelchair wheel. The movement of the fork element relative to the clamping member is limited by abutting surfaces on the fork element and the clamping member.

Abstract: A suspension structure for a wheelchair generally includes movable arm that serve to connect driving wheels with frame of a wheelchair, sliding unit is further provided for enabling the movable arm to movably connect with a front cantilever of the wheelchair. By such arrangements, in case that the wheelchair of the present invention encounters a raised ground, or similar barriers of the like, the front cantilever will work with the movable arm to raise front jockey wheels, whereas the driving wheels firmly catches the ground, such that enables the wheelchair to the pass the barrier smoothly without difficulties.

Abstract: A rocking wheelchair is provided with multiple adjustable features to meet various needs of different users with respect to safety, comfortableness and user/caregiver convenience. The rocking wheelchair includes an adjustable maximum rocking motion setting for users to select a preferable maximum rocking motion within a predetermined safety range. Rock/tilt locking mechanisms enable the seat assembly to be locked in either a normally unoccupied position or one of a plurality of tilt positions. The footrests can be selectively attached to either the frame for supporting the user's feet in a stationary position, or to the seat assembly to rock together therewith. The wheelchair can also be adjusted in height and is formed with a relatively simple configuration which is convenient for manufacturing.

Abstract: A center-of-gravity tilt-in-space wheelchair includes a base, a seat for supporting an occupant, and tracks supporting the seat for selective seat movement relative to the base. Wheels are adapted to support the base relative to a supporting surface. The tracks serve as rolling or sliding surfaces that allow the seat to rotate with respect to the base. Each track has a constant-radius arc with a focal point that is adapted to be coincident with the center of gravity of the wheelchair occupant. A low-friction supports the base relative to the seat. The low-friction support may include low friction elements that mate with the tracks to support for the tracks. The support can be adjustable to permit the overall tilt angle range of the tracks to be adjusted. The wheelchair seat can be adjusted to maintain the focal point of the constant-radius arc of the tracks coincident with the center of gravity of the wheelchair occupant. The front and rear wheels can be adjusted fore and aft relative to the focal point.

Abstract: A raising wheel chair includes a raising frame with a lever parallelogram to maintain a backrest upright both in sitting and standing position of the user. A lever provides a movement of the backrest in such a way that no movement between the backrest and the body of the user takes place when a change from sitting to standing or lying takes place.

Abstract: A child and adult transporting stroller system is disclosed that provides an adult ride along function. The system includes a frame having a front and a rear and lateral sides, a child supporting seat mounted on the frame, ground engaging structure for engaging a ground surface and supporting the frame on the ground surface, moving structure for rotating the ground engaging structure for moving the frame over the ground surface, and steering structure for steering movement of the frame. The system also includes an auxiliary person support platform assembly mounted on the frame. The auxiliary person support platform assembly includes a platform that is pivotable between a lowered, person supporting position and a raised, stored position.

Abstract: A wheelchair (10) comprises a seat member (14) pivotally mounted on support beam (16) of a chassis (12). The chassis (12) includes a pair of spaced-apart side elements (18), each depending from the support beam (16) and having a first part (20) supporting a front ground-engaging wheel (22) and a second part (24) supporting a rear ground-engaging wheel (26). A bracing member (32) extends between the second parts (24) of the side elements (18), and supports a variable length strut (68). The variable length strut (68) extends from the bracing member (32) to rearward part (66) of seat member (14) and controls pivotal movement of seat member (14) around support beam (16).

Abstract: An adjustable portable protective cover for covering a shopping cart handle includes three elongated resilient tubular member telescoped together. The members include stops for retaining the members together in the fully extended position. The inner and outer members have a radially outwardly protuberance at a free end thereof. The members can be collapsed to a minimum length for storage and carrying. The members are formed of an easily cleaned material so that the cover can be reused.

Abstract: The Feet First Footrest assembly is comprised of an outer rail, a carriage, a footrest arm a footrest, and clamps for attaching the outer rail to the wheelchair frame. The top end of the footrest arm is attached to the carriage with mounting hardware. The footrest is attached to the bottom end of the footrest arm by associated hardware. The carriage, with footrest arm and footrest attached, slides to the extended position and retracted position along the outer rail. In the extended position the footrest assembly locks in place to permit use when needed. In the retracted position, beneath the wheelchair seat, the wheelchair can be conventionally folded for storage or transportation.

Abstract: A leg support accessory releasibly interactive with a hospital shower room chair is provided as an integral structure fabricated of PVC pipe and fitting components. The accessory includes an elongated leg rest section adapted to extend horizontally forward of the seat of the chair. An upper support member extends upwardly from the leg rest section and rearwardly to engage a front leg of the chair. A lower support member extends downwardly from the leg rest section to engage a crossbar that extends horizontally between the front legs of the chair.

Abstract: A manually operable standing wheelchair includes an actuator for moving an occupant from a sitting position to a standing position. The manually operable standing wheelchair has a lifting mechanism, including, for example, a ratchet, cable, pulley, and telescopic tubes, which the occupant may manually operate to shift from the sitting position to the standing position. There is also a drive system to enable the occupant to manually move himself or herself in and the wheelchair from the sitting position to the standing position, or in any position in between. For example, the drive system may include adjustable lever drive arms with friction pads adapted for allowing the occupant to move in any position. In an embodiment, the wheelchair is equipped with a set of spring loaded anti-tip wheels that automatically deploy when the manual wheelchair begins to lift from the sitting position to the standing position.

Abstract: A wheelchair has a primary articulated member and at least one secondary articulated member, a primary sensor for detecting the position of the primary member, a secondary sensor for detecting the position of the secondary member, and a controller capable of articulating the secondary articulated member as a function of the movement of the primary articulated member.

Abstract: A wheel mount assembly adapted for use in securing a camber tube to a wheelchair frame comprises an axle plate, at least one axially displaceable member adapted to be fixed in relation to the axle plate, and at least one radially displaceable member adjacent the axially displaceable members. The axially displaceable member is adapted to be axially displaced to cause the radially displaceable member to be displaced to tighten against the camber tube to hold the camber tube in place.

Abstract: The present invention relates to a wheelchair and an underseat alarm system therefor.

Abstract: An ambulatory device comprising a frame having support rails, two large rear wheels containing hand grips, two small front wheels for steering, a foldable seat allowing the user to sit when desirable, and a height-adjustable support frame having a vertical and horizontal section rising from the frame. A body halter holding the user is rotatably supported by a swivel support which is connected by connector ropes or cables to a support bar. The support bar is connected by connector ropes or cables to a winch which lifts and lowers the user. An optional scale may be present so that the amount of weight of the user supported by the device may be measured and controlled.

Abstract: An assembly comprises an elongate member and a receiving member. The elongate member has an external cross-sectional shape which is substantially square and has corners replaced by circumferentially spaced circular portions of a circumscribing circle with flat portions therebetween which lie within the circle. The receiving member has a receiving formation having an internal cross-sectional shape which cooperates at least with the flat portions of the external cross-sectional shape of the elongate member to prevent relative movement between the receiving member and elongate member about a longitudinal axis of the elongate member. The assembly is adapted for use in a joining the members of a wheelchair. The invention is further directed towards a structural assembly comprising an elongate member engaging in a receiving formation of a receiving member and a clamp embracing the receiving member to clamp the elongate member in the receiving formation.

Abstract: A power wheelchair with front anti-tip wheels for substantially eliminating partial tips of the wheelchair is described. The anti-tip wheels are attached to the end of an extension arm which is attached to the frame of the wheelchair. A spring connects the anti-tip wheels with the frame at a second point. The spring tends to hold the anti-tip wheels in a neutral position at a predetermined height above the ground. A lowering mechanism is provided which positions the anti-tip wheels in a position engaged with or just above the ground. A retaining system holds the anti-tip wheels on or near the ground until the user or a release trigger device releases the retaining system, at which time the anti-tip wheels return to the neutral position. While the retaining system is disengaged, the wheels are free to rise in response to an upward force in order to climb over an obstacle in the wheelchair's path of travel.

Abstract: The present invention provides a curb-climbing wheelchair having pivotal arm assemblies. The pivotal arm assemblies include at least one front caster and have the ability to rotate or pivot. The pivot arms rotate or pivot in response to moments generated by accelerating or decelerating the wheelchair thereby raising or lowering the front caster(s) through the rotational movement of the pivot arms. By raising or lowering the front caster(s) in such a manner, curb-like obstacles can be traversed in a low-impact manner.

Abstract: Disclosed is a wheelchair for transporting a patient. The wheelchair comprises a support frame having a front, a rear, and opposing sides with the front and rear facing in respective forward and aft directions and the opposing sides facing in opposing lateral directions. The wheelchair further comprises at least two main wheels mounted on the support frame and a seat base disposed upon the support frame between the main wheels. The seat base is configured for selectively raising and lowering the patient between a first level and a second level with the aid of at least one security beam disposed adjacent one of the main wheels. The security beam may have a substantially vertical orientation and may be configured as a hand hold for steadying the patient when transferring onto and off of the seat base.

Abstract: A wheelchair includes a seat frame having two transverse support rods, a foldable sunk-type seat module mounted on the seat frame and located between the two transverse support rods, a backrest frame having two upright support rods, and a foldable sunk-type backrest module mounted on the backrest frame and located between the two upright support rods. Thus, the backrest module may be mounted on and detached from the upright support rods of the backrest frame easily, rapidly and conveniently, and the seat module may be mounted on and detached from the horizontal support rods of the seat frame easily, rapidly and conveniently.

Abstract: A drive for a wheelchair having two larger diameter drive wheels with axles, the drive with regard to each drive wheel, including inner and outer disks flanking the drive wheel and being in fixed rotational relation with the drive wheel about the axle, a lever having a lever axis, the lever rotatable about the axle and about the lever axis, a cam selectively rotatable about the lever axis by the lever to and from a contact position and a non-contact position with respect to the outer disk, and a shoe positioned for contact engagement with the inner disk when the cam is in the first position. When the lever is rotated about the axle, and the cam is in the contact position, the cam and the shoe frictionally engage the respective disks propelling the wheelchair.

Abstract: A seating frame for wheelchairs in which a bottom and a back pivotally connect for selectively angling the back relative to the bottom, with the bottom and the back each defining elongate slots for receiving fasteners that connect cushioned pads to the bottom and the back in selected positions relative to the bottom and the back upon moving the fasteners along the respective slots between a first extent of the slots to a distal second extent. A method of moving a seat cushion relative to a support therefore is disclosed.

Abstract: This invention constitutes a lightweight wheeled chair forming a companion rider device formed of hollow tubular frame members. A tow bar can be attached to the tow bar attachment with a pin coupling assembly. The tow bar attachment is mountable to the front ends of the lower side frame of the chair or it may also be permanently fixed there. The tow bar is downwardly curved from its middle and it has a feet rest. The height of the wheelchair may be adjusted by mounting the back wheels and the castor wheels in different adjusting holes provided in the chair frames and in castor wheel attachement. The present invention is to provide a lightweight wheelchair that can be used as a standalone wheelchair, as well as for a recreational use coupled to a motorized vehicle, such as an electric wheelchair.

Abstract: A wheelchair footrest retractor (10) is disclosed for use with a footrest (16, 18) in a wheelchair (14) to allow the wheelchair user or caregiver to readily manipulate the footplates (20) between an upper retracted position and a lower use position by simply manipulating a handle(56) located to the side of the knee of the wheelchair user. The wheelchair footrest retractor (10) can be mounted to the wheelchair with little or no modification of the wheelchair. The rod (58) in the wheelchair footrest retractor (10) can be adjusted in length to fit a particular wheelchair and also adjusted when the length of the footrest(16, 18) is adjusted.

Abstract: A convertible wheelchair is provided along with a separable lift module for engaging and elevating the convertible wheelchair to a selected elevation. A coupling assembly is operative associated with the lift module and adapted to extend therefrom to where the coupling assembly attaches to the convertible wheelchair. In one embodiment, the coupling assembly comprises a three-point attachment that results in the wheelchair being connected to the coupling assembly and hence the separable lift system at three points. Once coupled to the lift system, the convertible wheelchair, with a patient supported therein, can be raised to a selected elevation. Thereafter, the wheelchair can be converted from a chair configuration to any one of several examination configurations.

Abstract: A wheelchair has actuation plates provided in juxtaposition with the seat to descend when a user sits on the seat to lower the seat with the user's weight and to ascend when the user rises from the seat to permit the seat to return with removal of the weight. A brake is mounted on the axle shafts to brake the axle shafts and energized constantly in a non-braking direction. Levers are coupled directly or indirectly to the brake to move according to descending motions of the actuation plates to put the brake in a non-braking state and to move according to ascending motions of the actuation plates to put the brake in a braking state. Biasing devices for evacuating legs that extend from the seat and/or steps that are mounted onto the legs.

Abstract: A carrier to transport a person in sitting position along with luggage, miscellaneous small articles and, when needed a gas cylinder and a holder to drip feed a patient. The carrier with a manually operable fail safe brake and foot rests that are tilted up and foldable whereby one being transported cannot stand on the foot rests and tip the unit but folds the foot rests to allow standing on the floor. The carrier may be stored in a normal cart space and is suitable for use in hospitals, airports etc.

Abstract: An electric drive attachment for a wheelchair comprising a drive housing containing an electric motor, a drive wheel which touches the ground and drives the wheelchair through frictional contact with the ground and speed reducing mechanism between the motor and drive wheel, attachment structure to attach the wheelchair drive unit to the wheelchair as a pair of clamps one on each side of the frame. Also included are torque dampening systems to reduce the shock of starting the motor, a clutch which enables manual forward movement of a wheelchair without engagement of the motor and without dragging of the drive wheel, an under run wheel and positive pressurization of the gear works and area surrounding the drive wheel to keep the housing free of debris.

Abstract: The system includes a back panel that attaches to the backrest of the wheelchair. The back panel is ornamented and/or decorated in a selected motif. A top element and side panel elements are provided that attach to the back panel. The top element extends above the occupant of the wheelchair and the side elements protrude from the side of the wheelchair. Both the top element and the side elements are ornamented and/or decorated in the same motif, as is the back panel. Decorative wheel attachments are also provided. The decorative wheel attachments attach to at least two of the wheels of the wheelchair, wherein the decorative wheel attachments share the same ornamentation motif as do the other elements in the assembly.

Abstract: A wheelchair brake system is provided that allows an operator of the brake system to retard and/or stop the motion of the wheelchair. The brake system provides for independent and variable application of a braking force to wheels of the wheelchair. The brake system includes first and second brake force application assemblies, first and second braking assemblies, and actuation lines coupling the respective brake force application assembly to the braking assembly. The brake force application assemblies may be associated with handles of the wheelchair that allow a secondary or ancillary operator to apply a braking force, but may be associated with armrests of the wheelchair for use by an occupant. The brake force application assemblies are rotationally positionable and/or pivotally positionable to achieve various orientations thereof. This provides ergonomic placement of the handles for comfort and ease of brake force application.

Abstract: A modularized assembly structure of a wheelchair includes two upper transverse tubes and two lower transverse tubes mounted between a pair of sided front module connecting members and a pair of sided rear module connecting members, thereby forming the main frame of the wheelchair. The front wheel and the rear wheel may be respectively mounted on the upper and lower transverse tubes which may be set at different horizontal positions and different vertical heights, so that the distance between the front wheel and the rear wheel may be adjusted arbitrarily.

Abstract: A transfer chair has a chair frame, a seat, wheels, and a lift arm which has an articulated path between home and target positions. The articulated path may define a limited clearance height to allow use with, e.g., cars having a small door opening. In one embodiment the seat is split and moves to allow passage of the lift arm as it travels along the articulated path. The lift arm is articulated such that a lifting bridle attached to a distal end of the lift arm is maintained in a constant angular orientation with respect to the chair frame during movement. The lift arm further has multiple deployment paths for target positions with different heights and distances. A transfer seat for the lift arm includes two flexible webs removably attached to the lifting bridle. The lift arm is constructed using four links which are pivotally connected end-to-end. The links can be folded to a stowed position within the chair frame.

Abstract: A rear carrying board assembly of a stroller includes a body, two joint devices, two connecting devices, and two shock-absorbing devices. Thus, the rear carrying board assembly is mounted on the rear portion of the stroller for supporting the baby or for placing an article, thereby enhancing the versatility of the stroller.

Abstract: An operating- and braking-assistance device for wheelchairs is attachable on the frame of a wheelchair. The device has at least one motorized pinion (15), which is driveable in both directions and which engages on an inner gear (14) that is attachable to the rim (11) of a wheel (10) of the wheelchair.

Abstract: A wheelchair apparatus for permitting a user to sit in an upright position while operating a wheelchair. The wheelchair apparatus includes a chair member being designed for supporting the user. The chair member has a seat portion. The chair member has a frame portion. The chair member has at least one drive wheel. The drive wheel is rotatably coupled to the frame portion. The chair member has at least one support wheel. The support wheel is coupled to the frame portion. The support wheel is designed for permitting the chair member to roll along the support surface. At least one lever assembly is operationally coupled to the drive wheel. The lever assembly is coupled to the chair member. The lever assembly is for rotating the drive wheel for propelling the chair member across the support surface when the lever assembly is actuated by the user.

Abstract: Disclosed is a wheelchair for transporting a patient. The wheelchair comprises a support frame having a front, a rear, and opposing sides with the front and rear facing in respective forward and aft directions and the opposing sides facing in opposing lateral directions. The wheelchair further comprises at least two main wheels mounted on the support frame and a seat base disposed upon the support frame between the main wheels. The seat base is configured for selectively raising and lowering the patient between a first level and a second level with the aid of at least one security beam disposed adjacent one of the main wheels. The security beam may have a substantially vertical orientation and may be configured as a hand hold for steadying the patient when transferring onto and off of the seat base.

Abstract: A wheel assembly for a wheelchair having a number of structural features, including a two-gear arrangement, in which one gear is a hypocycloidal gear providing a gear ratio lower than 1:1. A shift member is located on the wheel assembly with hand operated shift portions of the shift member, the shift member capable of moving laterally (perpendicular to the axle) of the wheel between two positions. The shift member can be moved by the user while seated in the wheelchair. The wheel assembly includes a hand rim which is connected to a housing within which is a gear assembly. The gear assembly includes two spaced cage plates which are joined by fixed shafts having unidirectional rollers positioned thereon around the periphery thereof.

Abstract: A seat (10) for a wheeled carriage or chair for children or disabled people, the seat having a multipart seat surface (11) and a pivotable backrest (12) connected to at least one part of the seat surface (11), such that with the pivoting of backrest (12) the position of at least one part of the seat surface is changed.

Abstract: A center-of-gravity tilt-in-space wheelchair includes a base, a seat for supporting an occupant, and tracks supporting the seat for selective seat movement relative to the base. Wheels are adapted to support the base relative to a supporting surface. The tracks serve as rolling or sliding surfaces that allow the seat to rotate with respect to the base. Each track has a constant-radius arc with a focal point that is adapted to be coincident with the center of gravity of the wheelchair occupant. A low-friction supports the base relative to the seat. The low-friction support may include low friction elements that mate with the tracks to support for the tracks. The support can be adjustable to permit the overall tilt angle range of the tracks to be adjusted. The wheelchair seat can be adjusted to maintain the focal point of the constant-radius arc of the tracks coincident with the center of gravity of the wheelchair occupant. The front and rear wheels can be adjusted fore and aft relative to the focal point.

Abstract: A suspension system for mounting a pair of wheels to a wheelchair is disclosed. The system includes a crossbar pivotally mounted to the wheelchair so as to pivot about a longitudinal axis. At least one spring assembly is located between the crossbar and the wheelchair frame for controlling the pivoting of the crossbar. A hinge assembly is mounted on each lateral end of the crossbar. The hinge assembly includes a first hinge component attached to the crossbar so as to be rotatable about a vertical axis, and a second hinge component resiliently connected to the first hinge component. The resilient connection biases the second hinge connection against rotation with respect to the first hinge component. A wheel and yoke assembly are mounted to the second hinge component.

Abstract: Disclosed is a wheelchair for a patient comprising a support frame, at least two main wheels mounted on sides of the support frame and a seat base disposed upon the support frame. Alternatively, a stretcher topping may be mounted upon a laterally slidable storage compartment that may be affixed to the support frame. The stretcher topping includes a seat base assembly having a removable seat panel stacked upon a potty panel with an aperture formed therethrough and opening into the storage compartment. The potty panel allows for evacuation of the patient while resting in the wheelchair. The seat base and the stretcher topping are configured for selectively raising and lowering the patient between first and second levels. At least one security beam is disposed on the wheelchair and may be configured as a hand hold for steadying the patient when transferring onto and off of the seat base.

Abstract: A barrier-free wheelchair constructed entirely of plastic or non-metal components. The device is designed to facilitate the passage of wheelchair occupants through magnetometers, such as those utilized for airport security. The present invention is non-collapsible in nature, as the device is intended for on-site usage and not for transport in vehicles and the like. Due to its materials and construction, the wheelchair of the present invention also allows for a solid non-sling seat, is pilferage resistant, and provides multiple surfaces upon which indicia, such as corporate graphics, may appear. In addition, consistent with pre-existing wheelchairs, the present invention allows for the removable attachment of a variety of accessories, including foot rests and trays.

Abstract: A height adjustable toilet seat apparatus for disabled users includes a toilet seat having a hinged lid. The apparatus may be fixed to a toilet bowl or to a wheelchair and includes telescopic legs for supporting the toilet seat and lid at different heights. A lid opening mechanism is operated by a foot lever slidably connected to at least one of said legs. A catch is biased to a holding position for holding the lid in a rotated attitude and a foot peddle and handle are provided to release the catch.

Abstract: A stabilizing system for a reclinable wheelchair connects anti-tip members to the wheelchair seat such that pivoting of the seat causes pivoting of the anti-tip members. In one embodiment, the stabilizing system includes cables connected at opposite ends to the seat and to the anti-tip members. The cables may be connected to the seat bottom or, alternately, to the seat back. The anti-tip members may incorporate a pivoting suspension member that includes a drive motor for the wheelchair. Pivot control mechanisms connected to the cables can be used to permit a predetermined amount of seat pivot without corresponding pivot of the anti-tip members. The stabilizing system alternatively includes axially compressible link members connecting the seat back to the anti-tip members to provide controlled pivoting of the anti-tip members based on pivoting of the seat.

Abstract: A adjustable foot rest for being used with a wheelchair to allow the foot of the user to positioned at a comfortable angle. The adjustable foot rest includes an adjustment assembly being designed for being coupled to hanger bracket of the wheel chair. A rest member is pivotally coupled to the adjustment assembly. The rest member is designed for supporting the foot of the user when the user is sitting in the wheelchair. The adjustment member permits the rest member to be angled with respect to the wheelchair whereby the adjustment member is designed for allowing the user to position an angle of the rest member at a comfortable angle to support the foot of the user.

Abstract: Ambulatory apparatus includes a framework mounted to a chassis for movement between sitting, standing and reclining conditions. Leading, trailing and intermediate wheel assemblies are attached to the chassis for supporting the chassis in a first wheeled condition including the leading and intermediate wheel assemblies engaged for wheeled movement against a support surface and a second wheeled condition including the trailing and intermediate wheel assemblies engaged for wheeled movement against a support surface. The chassis and the framework define a center of gravity that is centered at the intermediate wheel assembly in each of the sitting and reclining conditions of the framework, and that is centered at the leading wheel assembly in the standing condition of the framework.

Abstract: A battery compartment for a motorized wheel chair includes a first securing bracket adapted to be securely connected to a side bracket of the motorized wheel chair, and a second securing bracket adapted to be securely connected to the side bracket of the motorized wheel chair and being opposite to the first securing bracket. A U-shaped first frame is pivotally connected to the first securing bracket. A U-shaped second frame is pivotally connected to the second securing bracket and to the first frame.

Abstract: A wheelchair has a frame assembly with longitudinal beams having grooves accommodating connecting members that retain the connecting members without welds on the beams. Expansion devices hold the connecting members in fixed positions on the beams. Supports secured to the connecting members are attached to wheels, a back rest, and a foot rest assembly.

Abstract: A supplementary wheel support for a motorized wheelchair to provide a supplementary support, includes a chassis, rockers, wheel supports, buffers, springs, auxiliary wheels and tilt-proof wheels; both side rods of the chassis being respectively pivoted with one end of the rocker; another end of the rocker being pivoted to the wheel support; a buffer being fixed between the chassis and the rocker; the wheel support being bend for its both ends a bending portion to define a triangle; both ends of the wheel support being respectively pivoted to the auxiliary wheel and the tilt-proof wheel; the bending portion of the wheel support being pivoted to another end of the rocker; both ends of the spring being respectively provided on the rocker and the wheel support; and the wheel support being driven by the auxiliary wheel to rise for the tilt-proof wheel to descend and grab the ground.

Abstract: A pushrim with increased surface area and an insert between the wheel and the pushrim. In the preferred embodiment, the cross-section of the pushrim is an elongated circle and the insert is a concave trough made of an elastic material which compressibly fits between the wheel and the rim for convenient installation. Improved pushing is provided by texturing the surface of the insert to provide increased friction. Improved braking is provided by providing a smoother and wider surface on the pushrim.