Patent ID: 7124858
Filing Date: 2006-10-24
Classification: A61G,B60T,B62B,F16D

Abstract:
1. A brake apparatus for restricting a rotation of a wheel via a brake drum rotating together with the wheel, comprising: a lock shoe for restricting the rotation of the brake drum by a self-energizing effect generated by wedge engagement with an inner circumferential surface of the brake drum only when the brake drum rotates in a backward direction; a brake force selecting means for applying or not applying a brake force to the wheel when selected from modes at least including: a lock shoe restraining arm for restraining the lock shoe at a position apart from the inner circumferential surface of the brake drum, wherein a restrained state of the lock shoe by the lock shoe restraining arm is released in the auxiliary brake mode, and the restrained state of the lock shoe by the lock shoe restraining arm is maintained in the brake release mode, and a forward rotation lock shoe for restricting the rotation of the brake drum by a self-energizing effect generated by wedge engagement with an inner circumferential surface of the brake drum only when the brake drum rotates in a forward direction, wherein the modes further includes the brake lock mode for applying the brake force by the lock shoe and a brake force by the forward rotation lock shoe to the brake drum, wherein the forward rotation lock shoe rotatably provided on the stationary shaft in such a manner as to confront the lock shoe the lock shoe restraining arm individually restrains the lock shoe and the forward rotation lock shoe at positions apart from the inner circumferential surface of the brake drum, in the auxiliary brake mode, only a restrained state of the lock shoe by the lock shoe restraining arm is released, in the brake lock mode, restrained states of the lock shoe and the forward rotation lock shoe by the lock shoe restraining arm are both released, and in the brake release mode, the restrained states of the lock shoe and the forward rotation lock shoe by the lock shoe restraining arm are both maintained.