Patent ID: 6851520

Claim:
A hoisting machine comprising: a stationary part, the stationary part comprising a shank, a stationary frame integrally formed with the shank, and a stator of a motor provided to the stationary frame; a rotary part, the rotary part comprising a rotary frame rotatably supported to the shank through a bearing and facing the stationary frame, a sheave integrally formed with the rotary frame on a side opposite to the stationary frame, a rotator of the motor arranged at an outer periphery of the rotary frame and facing the motor stator, and a brake wheel integrally formed with the rotary frame and having a larger diameter than that of the sheave; and a braking device mounted to the stationary frame, the braking device coming in contact with the brake wheel for braking operation, the braking device comprising: a pair of rotation shafts; a pair of brake arms, the brake arms being rotatably supported to the stationary frame through the rotation shafts; a pair of brake pads each arranged at one end of the corresponding brake arm, the brake pads contacting and separating from the brake wheel; and a brake part connected to another end of the brake arms, the brake part providing and releasing a braking force of the brake pads, wherein when centers of the rotation hafts are fulcrums, centers of contact of the brake pads with the brake wheel are points of action, and connections between the brake arms and the brake part are power point, the fulcrums, the points of action, and the power points are located in a semicircular area of the brake wheel.