Patent ID: 7571966

Claim:
A stroller comprising: a stroller frame; a removable wheel device including a wheel unit including a wheel body and a wheel axle coupled to said wheel body, said wheel axle having an axis and an outer axle surface having an annular groove that surrounds said axis; a housing having a frame mounting portion mounted on said stroller frame, said frame mounting portion having an outer surface with a ring-shaped barrier, the housing also having a brake installing portion connected to said frame mounting portion, said wheel axle removably extending into said housing, and a locking unit including an actuator disposed in said ring-shaped barrier of said frame mounting portion of the housing, said actuator having an operating end portion, a force transmitting end portion opposite to said operating end portion, and a pivot portion located between said operating end portion and said force transmitting end portion, the pivot portion being connected pivotally to said ring-shaped barrier of said frame mounting portion of said housing, an elastic member mounted between said operating end portion of said actuator and said housing, and a locking pin having a first pin end connected to said force transmitting end portion of said actuator and a second pin end opposite to said first pin end, said operating end portion of said actuator being depressible against restoring action of said elastic member to move said force transmitting end portion from a locking position, where said second pin end of said locking pin extends into said annular groove in said wheel axle to prevent removal of said wheel axle from said housing, to an unlocking position, where said second pin end of said locking pin is disengaged from said annular groove in said wheel axle to permit removal of said wheel axle from said housing; and a brake device including a drum mounted to and co-rotatable with said wheel body, and a drum braking mechanism mounted to said brake installing portion and operable to stop rotation of said drum.