| 摘要 |
An overload prevention device for a hoist has, between the inner peripheral surface of an operation means (9) and the outer peripheral surface of a drive member (10), a rotation drive member (11), a spring member (12), and a spring hold down member (13). The rotation drive member (11) has a means engaging with the drive member (10) and the operation means (9), transmitting drive of the operation means (9) to the drive member (10), and limiting, by torque of the operation means (9), torque to be transmitted to the drive member (10). The spring member (12) is formed between the back surface of the rotation drive member (11) and a spring hold down member (13), wound on the outer peripheral surface of the drive member (10) in a tubular space extending in an axial direction, and pressing the rotation drive member (11) to the drive member (10) side. The spring hold down member (13) is engaged with the drive member (10) and pressing an end of the spring member (12). Without increasing the size of the device, the rotation drive member (11) can be urged by the spring member (12) having a large stroke. |
