| 摘要 |
PURPOSE:To fix and release a movable leg and fixed legs by one motion by fixing one of a pair of the fixed legs to a frame body and revolving the eccentric cam having a hook part arranged to the frame body. CONSTITUTION:When the lever part 3b of an eccentric cam 3 is revolved in the direction shown by an arrow 1, a press part 3c largely enters the insertion hole 2a of a frame body and comes into contact with the patch 4 arranged to one leg 12b among a pair of fixed legs. Since the other leg 12a of the fixed legs is fixed to the frame body, the leg 12b and a movable leg 11 are pressed to the leg 12a by the press part 3c to fix the fixed legs and the leg 11 in a pressure contact state. When the fixation of the legs is released, the lever part 3b is revolved in an opposite direction. When the cam 3 is revolved in such a state that three leg parts are integrally engaged each other (three frame bodies are mutually restricted) by the rod-shaped bodies 2c formed at the position opposite to the arranging positions of the cams 3 of the respective leg parts and the hook parts 3d of the cams to prevent the expanse of the respective leg parts. |
