| 摘要 |
An overload preventing apparatus of a hoist characterized in including a drive shaft 2 for driving a load sheave 1 , a pressure receiving member 4 outwardly fitted to the drive shaft 2 , a drive member 10 for transmitting a drive force from operating means 14 to the drive shaft 2 by way of the pressure receiving member 4 , a rotation drive member 12 including means of transmitting the drive force from the operating means 14 to the drive member 10 and releasing an engagement with the drive portion 10 when the operating means 14 is applied with a torque equal to or larger than a predetermined torque value and an elastic member 13 mounted along an axial direction of the drive member between a back face of the rotation drive member 12 and an inner side end face of the operating means 14 to pose a problem that a belleville spring is obliged to be used as urging means, and therefore, a stroke in the axial direction of the urging means is small, also a height of an engaging claw becomes small in accordance with the stroke of the belleville spring and a variation in a load relative to a height of the claw becomes large.
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