Abstract: A wheel holder assembly includes a mounting frame fixedly fastened to the footplate of a skateboard, a screw bolt mounted in the mounting frame, a hook plate mounted on the screw bolt and hooked on a barrel at the mounting frame, a swivel wheel holder frame mounted on the screw bolt to hold a pair of wheels, a first corrugated washer and a second corrugated washer mounted on said screw bolt and matched with each other between the hook plate and the wheel holder frame, the first corrugated washer having a locating groove engaged with a locating rib at the wheel holder frame for enabling the first corrugated washer to be turned with the wheel holder frame about the screw bolt relative to the second corrugated washer, and a compression spring mounted on the screw bolt to force the wheel holder frame against the first corrugated washer.

Abstract: A steering control mechanism for folding collapsible kick scooter includes a footplate having a fixed front mount, a steering control column mounted on the front mount and turned relative to the footplate between a vertical operative position and a horizontal non-operative position, and a locking mechanism adapted to lock the steering control mechanism between the vertical operation position and the horizontal non-operative position, the steering control column having a bottom yoke, the bottom yoke having two arms respectively pivoted to a transverse pivot in the front mount; the locking mechanism comprises a locking lever pivoted to the front mount above the transverse pivot and turned to lock/unlock the bottom yoke of the steering control column, the locking lever being extended over the bottom yoke and having spring means pressed on the bottom yoke after the steering control column has been turned to the operative position, and brake means provided at the bottom yoke and adapted to engage a stop face of th

Abstract: A kick scooter steering mechanism includes a bracket fixedly fastened to the footplate of a kick scooter, a bearing structure provided at said bracket, a pivot shaft supported in the bearing structure, a steering shaft pivoted to the pivot shaft and holding two wheels at two ends, a fixed friction member provided at a bottom side of the bracket, and a spring plate supported between the steering shaft and the friction member to bear pressure from the bracket and the footplate of the kick scooter.

Abstract: A folding collapsible kick scooter includes a head tube folding structure, which uses a quick-release lock to lock the head tube between an extended position and a collapsed position, and a handlebar folding structure, which uses a quick-release lock to lock the left handlebar and the right handlebar between an extended position and a collapsed position.

Abstract: A folding collapsible kick scooter includes a head tube folding structure, which uses a quick-release lock to lock the head tube between an extended position and a collapsed position, and a handlebar folding structure, which uses a quick-release lock to lock the left handlebar and the right handlebar between an extended position and a collapsed position.

Abstract: A folding collapsible kick scooter includes a footplate, a head tube collapsibly coupled to the front side of the footplate by a joint and lock unit, a stem moved in and out of the head tube and releasably locked in position by a quick-release lock, a handlebar connector mounted on the top end of the stem to hold two handlebars, a press control lock installed in the handlebar connector and adapted to lock the handlebars between two positions, a front wheel holder fixedly fastened to the bottom end of the head tube and holding a front wheel on a front suspension arm thereof, a rear wheel holder fixedly fastened to the rear side of the footplate and holding a rear wheel on a rear suspension arm thereof, and a rear fender pivoted to the rear wheel holder and supported on spring means and served as a foot brake for stopping the rear wheel from rotation.