Patent ID: 8596421

Claim:
A stopper apparatus for a roller wheel, the stopper apparatus comprising: a bracket whose lower portion is coupled to a wheel axis of the roller wheel and on one lateral surface of which a guide hole is penetrated; a stopper wheel that is combined with the wheel axis of the roller wheel coupled with the bracket and along the circumferential portion of which a plurality of stop gear protrusions are radially formed; a locking key that is coupled with the bracket by a coupling bolt that is penetratively connected toward a guide hole of the bracket in which the locking key is positioned between the bracket and the roller wheel, and on the bottom of which a locking piece corresponding to the stop gear protrusions of the stopper wheel is formed; and a locking unit that is located and coupled on an outer surface of the bracket by a coupling pin and includes an insertion hole through which the coupling bolt is penetratively coupled with the guide hole of the bracket in which the locking unit makes the coupling bolt that is connected with the locking key move up and down to thus escalate the locking key.