A combined engine and pedal-powered multipassenger, multipurpose four-wheel vehicle constructed by operatively connecting any two compatibly configured, commercially available bicycles and powering at least one of its four wheels with auxiliary propulsion apparatus for optional power assist of such vehicle. The two bicycles are operatively interconnected into side by side, spaced apart and aligned relationship by plural, specifically configured members, each bent to form a longer mid-portion and two shorter end-portions; each mid-portion positioned substantially horizontally and transversely between the two bicycles and each shorter end-portion operatively attached to correspondingly positioned frame members of the two bicycles at two spaced-apart points. A steering assembly based on modified trapezium linkage principle of king-pin with track-arm and track-rod connection of the front wheels of the two bicycles to provided efficient steering from either bicycle. An auxiliary propulsion apparatus to drive at least one wheel of the vehicle provides a choice of usual pedal-power alone, auxiliary power alone, or any combination of the two. Variety of auxiliary accessories interchangeably attachable to the interconnecting members enable the vehicle to transport additional passengers and assorted cargo in varied combinations of them. All operating controls of the two bicycles and the auxiliary power assist apparatus are combined for operative control by one person. All protective attachments and obligatory accessories required for safe, legal operation of thus constructed vehicle over public streets and roads are effectively incorporated.

A pedal-powered golf cart includes a pair of pedal assemblies disposed to drive the input shaft of a transmission, the transmission provides at least two output gear ratios at a drive shaft operatively connected to a gear box adapted to rotate a pair of driving wheels. The golf cart further includes a storage compartment and means for supporting at least one golf bag thereupon. The seats are separately adjustable with respect to each of the pedal assemblies.

A novel dual bicycle connecting kit for connecting two bicycles in a side-by-side relationship. The kit may comprise a fixed handle bar coupling assembly attached to the first bicycle; one or more frame coupling assemblies attached at one end to the first bicycle and attached at the other end to the second bicycle. Also, one or more steering coupling assemblies may be attached at one end to the first bicycle and attached at the other end to the second bicycle. Another feature of the kit is that a canopy assembly may be provided having a canopy support frame and a canopy where the canopy support frame is attached to the first bicycle and the second bicycle and the canopy is attached to the canopy support frame. Alternate embodiments may provide a seat assembly having a seat support frame and seat wherein the seat support frame is attached to the first bicycle and the second bicycle and the seat is attached to the seat support frame. Still further alternate embodiments may have a basket assembly having a basket support frame and a basket wherein the basket support frame is attached to the first bicycle and the second bicycle and the basket is attached to the basket support frame.

A four-wheeled motor vehicle constructed by operatively coupling two exclusively configured left and right longitudinal side structures by plural, transversely positioned connecting and bracing members. Each side structure operatively supported by its own front wheel adapted for steering and rear wheel adapted for propelling the vehicle. Each of the connecting members comprising a longer mid-portion positioned transversely between the two longitudinal sides, and two shorter end-portions which are secured to correspondingly positioned structurally rigid sections of them. Steering system operatively couples the two front wheels of the two sides for steering thus coupled vehicle. A propulsion plant propels at least one of the wheels. All operating controls are configured for safe and legal operation of the vehicle by its driver. The longer mid-portions of said connecting members support body panels positioned intermediate the two side structures, vehicle floor and seats. The basic configuration is adaptable to be combined into variously configured, open, closed and convertible vehicle bodies. Various facets of the basic concept are adaptable for partial application in construction of new and conversion of existing conventionally constructed motor vehicles of all types.

A recumbent vehicle including parallel paired recumbent bicycles operatively and reversibly joined by a bracing assembly having less than four brace members, is provided. The parallel paired recumbent bicycles are easily separable, without the need for tools, for individual riding. A conversion kit for reversibly uniting a pair of recumbent bicycles so as to form a recumbent quad is similarly provided. The kit generally includes a bracing assembly including a pair of braces, and brackets adapted to reversibly receive portions of the braces therein. One of the brackets is a front bracket with another of the brackets being a rear bracket. The front bracket is supported by a front triangle of a diamond frame of the recumbent bicycle, with the rear bracket being supported by a rear triangle of the diamond frame.