Importance

Loading Importance Indicators...

Abstract

A lever hoist comprises a change gear for driving a sheave for winding-up a chain or rope for a load, an operating lever rockably driven by a hand, winding-up and winding-off driving pawls engageable with teeth of the change gear and changeable in response to the purpose of hoisting or lowering the load, and a braking assembly for preventing the change gear from being driven by a gravity of the load and having a spring for releasing the braking assembly. According to the invention, the winding-up and winding-off driving pawls are formed in a unitary member pivotally secured to the operating lever and opposite portions of the pawls of the unitary member are engageable with a holding member urged by a spring, and a distance between a center of the pivot shaft and the portion associated with the winding-off driving pawl is larger than a distance between the center of the pivot shaft and the portion associated with the winding-up driving pawl, so that the winding-off pawl is urged against the teeth with a larger force than that of the winding-up pawl urged against the teeth. With such an arrangement, when a light load is hoisting up, the return movement of the operating lever does not carry along the change gear. When a light load which does not operate the braking assembly is lowering, the large urging force of the winding-off driving pawl prevents the change gear from rotating against the winding-off driving pawl.

Loading the Abstract Image...

First Claim