| 摘要 |
PURPOSE:To enable rotation of an output shaft only through the rotation of an input shaft by arranging a pair of lock body receiving sections symmetrically at the opposite sides of a projecting section receiving section and arranging plural sets of the pair of lock body receiving sections and the projecting section receiving section on the outer circumferential face section of a driven body mounted on an output shaft. CONSTITUTION:When an output shaft 2 starts to rotate forwardly or reversely, a lock body 5 is stopped through friction against a cylinder 8 at the advancing side of lock body receiving bottom 4a, i.e. a lock body receiving section 4, and thereby the lock body receiving bottom 4a is pressed toward the outside thus the lock body 5 in wedge shape between the receive bottom 4a at the advancing side and the inner diameter face of the cylinder 8. Since rotation of the cylinder is blocked, rotation of the receiving bottom 4a and hence the rotation of a driven body 3 and the output shaft 2 are blocked. On the contrary, when the input shaft 1 and a protrusion 6 for transmitting the rotation are rotated forwardly or reversely, the protrusion 6 rotates forward in a projecting section receiving section 10 so as to push the lock body 5 placed in the receiving section 4 against a lock body push wall 4b thus rotating the shaft 2. |
