Importance

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Abstract

In an unloaded state, by pulling the pressing drive member apart from the pressure bearing member by moving to the operation wheel side, the load sheave is allowed to rotate freely without disengaging the pinion of the drive shaft and the load sheave. In this lever operated hoist, at this time, since the conical friction member to be engaged with the pressing drive member in the rotating direction, and the intermediate member spline-coupled on the drive shaft adjacently to this conical friction member respectively have engaging parts to be engaged with each other in the rotating direction, disposed at their confronting ends, these engaging parts are engaged with each other when the load sheave rotates freely, and the contact of the torque transmitting member and other constituent members is effectively prevented, so that the load sheave is permitted to idle continously and smoothly. At the outside position in the axial direction of the torque transmitting member, a cylindrical ring for supporting the outside tubular part of the operation lever is integrally disposed, extending to the outer circumference of the operation wheel, and therefore, in the hoisting-up work, the external pressure from the outside tubular part of the operation lever is applied on the torque transmitting member through the support ring, and will not be transmitted to the operation wheel.

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First Claim