Mechanism for detachably fastening boot and truck of roller skate

A detachable roller skate comprising:

• a boot comprising an elongate plate on a sole, a front rounded cavity at a front end of the elongate plate, and a rear rounded cavity at a rear end of the elongate plate wherein each cavity has two resilient side protrusions and a rear projection;
• a truck comprising a sole plate, an engagement plate sized to be substantially the same as the sole plate and being threadedly secured to the sole plate, a front abutment member on a top of the engagement plate having a neck and a rear projected member above the neck, a rear opening in the engagement plate, a front upright projection in the rear opening, an internal receptacle extended forward from about a bottom of the upright projection, a resilient member received in the receptacle, and a channel extended from the rear opening to a rear end of the engagement plate;
• and
• a push block comprising a front flat, a rear elongated plate, a stop member above the flat, two side grooves at the stop member, an abutted member on a top of the stop member, and two side dents at the abutted member being perpendicular to and in communication with the side grooves;
• wherein in an assembly process insert the flat into the rear opening until the stop member passes through the front end of the flat to be urged by the resilient member in the receptacle, the rear elongated plate is received in the channel with its rear end extended beyond the rear end of the engagement plate due to an expansion of the resilient member, align the front cavity with the front abutment member prior to engagement with the side protrusions of the front cavity clung in the neck and the rear projection of the front cavity fastened to the projected member, press down a heel portion of the boot to cling the rear cavity onto the stop member and the side protrusions and the rear projection of the rear cavity engaged with the abutted member and the side dents respectively, bias the resilient member forward, in response to the side protrusions of the rear cavity passing through the side dents, and the push block is pushed upward by a rearward expansion of the resilient member to urge the side protrusions and the rear projection of the rear cavity against sides and a rear end of the abutted member respectively;
• or in a disassembly process, push the rear elongated plate forward to disengage the stop member from the rear cavity, in response, lift the heel portion of the boot and pull the same rearward, and detach the boot from the roller skate.