Patent ID: 6938300

Claim:
A stroller having a stroller frame, a pair of front wheel assemblies disposed on a front end of said stroller, and a pair of rear wheel assemblies disposed on a rear end of said stroller, each of said front wheel assemblies comprising: a wheel unit including a wheel and a wheel axle that is coupled to said wheel so as to permit rotation of said wheel about said wheel axle, said wheel having a rim and a wheel wall, said rim defining a mounting space therein and having a vertical inner side surface that is adapted to be proximate to the stroller frame, a vertical outer side surface that is opposite to said inner side surface and that is adapted to be distal from the stroller frame, and a vertical central plane that is located between said inner and outer side surfaces; a fixed seat mounted fixedly to the stroller frame and having a fixed pivot-mounting portion that extends into said mounting space in said wheel of said wheel unit; a vertical pivot shaft disposed on said pivot-mounting portion of said fixed seat and extending in said vertical central plane of said rim, said vertical pivot shaft being spaced apart from said wheel axle of said wheel unit; and a wheel seat unit connected to said wheel unit and said vertical pivot shaft and rotatable about said vertical pivot shaft, said wheel axle being journalled n said wheel seat unit.