A suspension for a wheelchair is disclosed, wherein the suspension comprises: a frame, a motor carrier pivotally mounted on the frame to rotate about a motor carrier axis, a drive wheel having a bottom and mounted on the motor carrier to rotate about a drive wheel axis, a swing arm pivotally mounted on the frame to rotate about a swing arm axis, a swing wheel having a bottom and mounted on the swing arm to rotate about a swing wheel axis, a first contact surface coupled to move in concert with the motor carrier, and a second contact surface coupled to move in concert with the swing arm and configured to contact the first contact surface and transfer an upward force on the swing wheel into a downward force on the drive wheel.

Several embodiments of wheeled vehicles, such as wheelchairs, that are adapted to traverse obstacles are disclosed. The wheeled vehicles include a frame, drive wheels, front anti-tip wheels positioned in front of the drive wheels, and rear anti-tip wheels positioned behind the drive wheels. One exemplary vehicle includes front anti-tip wheels supported by rigid arms that are fixed to the frame and drive assemblies that are independently suspended from the frame. Another exemplary vehicle includes a linkage that links the front and rear anti-tip wheels, such that movement of one of the front anti-tip wheel or the rear anti-tip wheel relative to the frame causes movement of the other wheel relative to the frame.

Embodiments of a suspension for a vehicle is provided. The suspension includes, for example, a frame and a locking assembly. The locking assembly inhibits tipping of a frame of the vehicle when tipping of the frame is detected.

Wheeled vehicles, such as wheelchairs, that are adapted to traverse obstacles are provided. The wheeled vehicles include a frame, drive wheels, front anti-tip wheels positioned in front of the drive wheels and rear anti-tip wheels positioned behind the drive wheels. One exemplary vehicle includes front anti-tip wheels supported by rigid arms that are fixed to the frame and drive assemblies that are independently suspended from the frame. Another exemplary vehicle includes a linkage that links the front and rear anti-tip wheels, such that movement of one of the front or rear anti-tip wheel relative to the frame causes movement of the other wheel relative to the frame.

The invention relates to suspension design. The present vehicle suspension comprises a quadrangular frame. Each corner portion of the frame has a wheel block kinematically attached thereto so as to form two pairs of wheelsa front pair and a rear pair. On each side of the frame, longitudinal and transverse coupling cables are fastened for movement therealong inside housings. Each wheel block consists of a body that is simultaneously connected to two coupling cables. Movably mounted on the body are parallel horizontal arms, the first of which is fastened to the body by its middle portion. A knuckle with the hub of a wheel is attached to an end of the first arm and to another end of the second arm, and two coupling cable dampers are attached to the other end of the first arm. The housings of the cables are attached to the body of the corresponding wheel block. The free end of each cable is enclosed in a damper. Mounted on the cable end portions that freely project from the housings in front of a damper are spring stabilizers of the position of the wheel of the wheel block. Each coupling cable is provided with a linear actuator. The result is an increase in the stability and smoothness of movement of a vehicle.

Embodiments of a suspension for a vehicle is provided. The suspension includes, for example, a frame and a locking assembly. The locking assembly inhibits tipping of a frame of the vehicle when tipping of the frame is detected.

A wheelchair suspension comprises a frame, at least one pivot arm, at least one front caster, at least one rear caster, a stabilizing system, and a sensor. The pivot arm is coupled to the frame. The front caster is coupled to the pivot arm. The rear caster is coupled to the frame. The stabilizing system is coupled to the frame and the pivot arm. The sensor is arranged such that tipping of the frame causes actuation of the stabilizing system to at least partially resist further movement of the frame.

A multi-functional off-road vehicle has a frame which includes a left lateral frame member and a right lateral frame member. The two frame members are connected by a crossbar. Four wheel assemblies are connected to the frame. At least two of the wheel assemblies are continuous tracks. The crossbar includes a track width adjustment actuator which extends and contracts a length of the crossbar and thereby changes a track width of the vehicle.

The present disclosure relates to a swing arm assembly (1) for a mid-wheel drive wheelchair (21), comprising: a front swing arm (3) having a front swing arm pivot point (3a), a drive assembly swing arm (5) having a drive assembly swing arm pivot point (5a) and a resilient member first mounting point (5b), a rear swing arm (7) having a rear swing arm pivot point (7a) and a resilient member second mounting point (7b), and a resilient member (9) configured to be connected to the resilient member first mounting point (5a) and to the resilient member second mounting point (7a) to enable force transfer between the drive assembly swing arm (5) and the rear swing arm (7).

A wheelchair suspension includes a frame, a drive assembly pivot arm, a drive assembly, a front caster pivot arm, a front caster, and a spring and shock absorbing assembly. The drive assembly pivot arm is pivotally connected to the frame. The drive assembly includes a drive wheel and is mounted to the drive assembly pivot arm. The front caster pivot arm is pivotally mounted to the frame and coupled to the drive assembly pivot arm. The front caster is coupled to the at least one front caster pivot arm. The spring and shock absorbing assembly is pivotally connected to the drive assembly pivot arm at a first pivotal connection and pivotally connected to the front caster pivot arm at a second pivotal connection. The first and second pivotal connections are positioned such that a majority of the force applied by the spring and shock absorbing assembly is applied to the drive wheel when the suspension is on a flat, horizontal support surface.