Wheel holder assembly for a skateboard

A wheel holder assembly installed in the footplate of a skateboard to hold a pair of wheels, comprising:

• a mounting frame fixedly fastened to the footplate of the skateboard, said mounting frame comprising a barrel and a countersunk hole spaced from and axially aligned with said barrel, said barrel having a locating notch;
• a screw bolt mounted in said countersunk hole of said mounting frame and extended through said barrel;
• a locknut threaded onto said screw bolt;
• a wheel holder frame pivoted to said screw bolt, said wheel holder frame comprising two fixed wheel axles axially aligned at two sides in a transverse direction with respect to the footplate and adapted to support a respective wheel, a pivot hole extended in a longitudinal direction with respect to the footplate and coupled to said screw bolt, and a locating rib disposed at a back sidewall thereof and aligned at one side of one end of said pivot hole;
• a hook plate mounted on said screw bolt and stopped between said barrel and said locknut, said hook plate comprising a through hole coupled to said screw bolt and a hooked head hooked on the locating notch of said barrel;
• a first corrugated washer mounted on said screw bolt and received inside said barrel between said wheel holder frame and said hook plate, said first corrugated washer comprising a center through hole coupled to said screw bolt, and a locating groove coupled to the locating rib of said wheel holder frame;
• a second corrugated washer mounted on said screw bolt and received inside said barrel and supported between said hook plate and said first corrugated washer;
• and
• a compression spring mounted on said screw bolt and stopped between said countersunk hole and said wheel holder frame.