Bicycle which can be converted into a unicycle

Claim 1

A convertible sport-cycle, comprising: a bicycle having a front portion and a rear portion connected together by a quick lock-release means; said quick lock-release means being manually actuatable to selectively connect said front portion and said rear portion of said bicycle; said quick lock-release means including a spigot piece; said spigot piece having two cylindrically-shaped portions receiving frame tubes of the bicycle; said spigot piece having a hook extending therefrom; a sleeve fixed on a fork stem of said bicycle; said sleeve having a socket; said socket having two parallel walls, each of said two parallel walls having a flange disposed adjacent an end edge of said each wall; a spindle rotatably supported by said two parallel walls; said spindle being fixedly connected to a cam head; said cam head being fixedly connected to an operating arm; whereby said operating arm is manually actuatable to control said quick lock-release means to selectively lock together or release said hook from said socket; said cam head having a convex surface and a concave surface mating with a wall of said socket; said bicycle having a fork stem supporting a handlebar; said handlebar being removable; a saddle detachably connected to a pillar of said bicycle; said handlebar being connected to said fork stem by a connecting means; said connecting means being connectable to said saddle; whereby, when said front portion is separated from said rear portion, said handlebar may be replaced by said saddle; said bicycle having a front wheel; said front wheel having a hub; at least one foot pedal being attachable to said front wheel for driving the separated said front portion after it has been separated from said rear portion; whereby said front portion is convertible into a uni-cycle.