| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly safe clutch device capable of reliably maintaining a locked state even when an excessive load is applied to a second member.SOLUTION: A clutch device includes a lock drum 1 on the side of a first member, an output shaft plate 6 on the side of a second member, a lock spring 3 internally fitted to the lock drum 1, and an adjusting drum 2 arranged inside the lock spring 3. The lock spring 3 has an outer diameter slightly larger than the inner diameter of the lock drum 1 in a free state, and includes lock spring step portions 3c each consisting of a lock spring curve portion 3d and a lock spring bottom portion 3e. Lock spring pulling-side contact points 3a and lock spring pushing-side contact points 3b are formed respectively on the side of the lock spring curved parts 3d on which the diameter of the lock spring 3 is contracted and the side on which the diameter is expanded. The adjusting drum 2 is provided with a lock spring operation piece 8 for pressing the lock spring pulling-side contact points 3a, and the output shaft plate 6 is provided with a lock spring pressing piece 7 for pressing the lock spring pushing-side contact points 3b. |
