Patent ID: 8632442

Claim:
A weight control apparatus of a weight training machine, the weight control apparatus comprising: a plurality of stacks which are fitted to a pair of guides standing upright between supports on a base such that the stacks slidably move up and down, and which have rectangular locking holes; a body arranged on a front surface of the base, in which the body has a plurality of insertion holes corresponding to the locking holes of the stacks and is provided at an upper portion thereof with a holder; and a cover arranged on the front surface of the body and having a plurality of locking pin members inserted into the insertion holes, wherein each locking pin member includes: a rectangular stopper having a recess inwardly recessed, protrusions protruding from both sides of the recess, and locking protrusions protruding from both sides of the stopper; a shaft pin connected to a front end of the stopper; a button arranged on a front end of the shaft pin; and a conical coil spring arranged between the button and the shaft pin.