One embodiment of an electric convenience vehicle (ECV) may include a frame, a plurality of wheels configured to support and move the frame, a user support member supported by the frame, a steering mechanism disposed toward a front portion of the ECV, a motor configured to cause at least one wheel to be propelled forward, propelled backward, or to remain in a fixed position, a throttle, when activated in a first position, may cause the motor to propel the wheel(s) in a forward direction, when activated in a second position, may cause the motor to propel the wheel(s) in a reverse direction, and a control and communications unit (CCU) disposed in front of the user support member, and configured to control operations of the motor.

A novel dual wheel front steering, single or dual wheel rear drive, three or four wheeled human powered vehicle which is extremely stable to operate. The invention is configured with a novel strong lightweight frame assembly incorporating a novel steering system and a pedal, crank and chain transfer drive system. The invention is configured in which the driver is seated in an upright position for maximum ergonomic efficiency and minimum propulsion effort. Said position also provides for easy mounting and dismounting on to and off of the vehicle. The invention is further configured with a novel steering system that is completely adjustable and incorporates Ackermann steering geometry to reduce wheel turning scrub and preserve forward momentum. The invention is further configured with components that are easily fitted with various manual drive systems, multiple gear ratio drive mechanisms, or power drive system such as an electric motor or similar device. The invention is more easily operated by children, elderly, and the handicapped than bicycles, traditional tricycles, and other three-wheeled human powered vehicles and is easily adapted for use by the handicapped.

The power transmission system for a vehicle includes a side flex chain assembly that transmits rotational drive from a power transfer assembly to at least one direction wheel, resulting in propulsion of the vehicle. The orientation of the side flex chain in relation to the axis of the crank sprocket and the side flex chain sprocket and the convex inner face of the bushings of the side flex chain allow the side flex chain to twist when the at least one directional wheel turns left or the right without disengaging from the crank sprocket or the side flex chain sprocket. The power transmission system is designed to be used with a steering system that allows the power transfer assembly to remain substantially in the sagittal plane when steering.

Device for driving a common shaft by pushing and pulling hand movements, that comprises respective driving bars for the left and right hands, and a mechanical unit that converts both the forward and backward movements of the pushed, respectively pulled driving bars to rotate a driven shaft, wherein respective biased rope drums (28, 29; 61, 62) are provided at both sides of the driven shaft, and on the rope drums respective ropes (30, 60) are arranged as windings, and the driving bars (15, 16; 51) are interconnected and pivoted around a common shaft (17, 52), the ropes are coupled to the respective driving bars in such a way that at one of the two sides an assembly is provided that reverses the direction of the rope displacement to become opposite to the direction of the displacement of the associated driving bar (16).

Device for driving a common shaft by pushing and pulling hand movements, that comprises respective driving bars for the left and right hands, and a mechanical unit that converts both the forward and backward movements of the pushed, respectively pulled driving bars to rotate a driven shaft, wherein respective biased rope drums (28, 29; 61, 62) are provided at both sides of the driven shaft, and on the rope drums respective ropes (30, 60) are arranged as windings, and the driving bars (15, 16; 51) are interconnected and pivoted around a common shaft (17, 52), the ropes are coupled to the respective driving bars in such a way that at one of the two sides an assembly is provided that reverses the direction of the rope displacement to become opposite to the direction of the displacement of the associated driving bar (16).

A wheelchair accessible cycle that can be driven on a surface and operated from a wheelchair. The wheelchair accessible cycle comprising a frame and a platform. The frame has a front portion with a first wheel and a rear portion with second and third wheels. The platform is disposed laterally between the second and the third wheels and longitudinally between the front and rear portions of the frame. The platform is configurable to transport the wheelchair and pivotally moveable between a tilted position, where a free edge of the platform is in contact with the surface for rollably receiving the wheelchair, and a horizontal position, where the platform is generally horizontal and the wheelchair is adjacent to the front portion of the frame when the wheelchair is loaded onto the platform.

A wheelchair accessible cycle that can be driven on a surface and operated from a wheelchair. The wheelchair accessible cycle comprising a frame and a platform. The frame has a front portion with a first wheel and a rear portion with second and third wheels. The platform is disposed laterally between the second and the third wheels and longitudinally between the front and rear portions of the frame. The platform is configurable to transport the wheelchair and pivotally moveable between a tilted position, where a free edge of the platform is in contact with the surface for rollably receiving the wheelchair, and a horizontal position, where the platform is generally horizontal and the wheelchair is adjacent to the front portion of the frame when the wheelchair is loaded onto the platform.

A knee walker for use as a walking aid by disabled persons includes multiple wheels operably coupled to a frame and a steering assembly. A knee pad is supported by the frame intermediate front and rear wheels to support a user's bent knee and lower leg thereon. A suspension or shock absorbing assembly is disposed intermediate the knee rest pad and the frame. The knee walker is adjustable to accommodate users of varying sizes.

A kneel push cycle apparatus that includes a kneeling pad disposed upon a suspension member coupled to a frame member, said frame member disposed between a directable front wheel and at least one rear wheel, wherein a user is enabled to kneel upon the kneeling pad with one leg and propel the kneel push cycle apparatus at a desired velocity by use of the other leg in striding contact with a ground surface, whereby expedient locomotion and voluble travel is enabled for a user desirous to maintain at least one lower leg off of the ground without bearing weight thereon.

A kneel push cycle apparatus that includes a kneeling pad disposed upon a suspension member coupled to a frame member, said frame member disposed between a directable front wheel and at least one rear wheel, wherein a user is enabled to kneel upon the kneeling pad with one leg and propel the kneel push cycle apparatus at a desired velocity by use of the other leg in striding contact with a ground surface, whereby expedient locomotion and voluble travel is enabled for a user desirous to maintain at least one lower leg off of the ground without bearing weight thereon.