| 摘要 |
<p>PURPOSE: To simplify operation so as to reduce energy required to lock and unlock by forming a contact surface of a cam to have a logarithmic spiral profile while forming a holding face to be flat, and providing resilient means for rotating the cam, and a means for rotating a hub with a stub off the center of a rotating shaft. CONSTITUTION: When a member 11 is oscillated around a fixed shaft 17 until its front face 39 comes in contact with a front end face 39 of a cam 1, the cam 1 is pushed back against a spring 29 by the front face 39, and a contact surface 3, having a logarithmic spiral profile, of the cam 1 is held to a plane 5 to be the slit bottom part of the member 11 to lock members 10, 11. In the case of unlocking the members 10, 11 from this optimum lock position, a handle 21 has only to be rotated counterclockwise. With this rotation, the contact surface 3 of the cam 1 is first lifted from a holding face 5 for eccentric mechanisms 20, 21, and the cam 1 is moved away against the spring 29 by a stub 26 to unlock.</p> |
