Quick-release holding down device for bicycle

A quick-release holding down device comprising:

• a screw rod having one end terminating in a locating block and an opposite end respectively inserted through a cup, a first spring and a device to be held down, and then threaded into a nut and a tightened up, said locating block having a pivot hole and a notch;
• a lever having two eyed lugs at one end pivotally connected by a pivot to two opposite ends of said pivot hole on said locating block of said screw rod, a longitudinal series of chambers, and a longitudinal locating hole extended through said chambers, said lever turned about said pivot for clamping said screw bolt and said bolt in a desired position and for unclamping said screw and bolt;
• a headed lock bar having an elongated body inserted into said longitudinal locating hole of said lever and a head received in said notch of said locating block of said screw rod, said elongated body having a longitudinal series of projecting blocks;
• a second spring fastened to said longitudinal locating hole of said lever and abutting said head of said headed lock bar for forcing said head of said headed lock bar into said notch of said locating block of said screw rod and providing resistance against turning of said lever about said pivot;
• and
• a plurality of numbered wheels respectively mounted around said elongated body of said headed lock bar and received in said chambers of said lever, a pair of washers arranged on both sides of each said numbered wheel, and each said numbered wheel having a notch matching a respective projecting block of said series of projecting blocks of said elongated body;
• so that when said plurality of numbered wheels is correctly aligned with said series of projecting blocks, said headed lock bar can pass thereby and said lever can turn about said pivot;
• and so that when said plurality of numbered wheels is incorrectly aligned with said series of projecting blocks, said headed lock bar cannot pass thereby and said lever cannot turn about said pivot.