Abstract: A manual hoist with overload preventer wherein rotation in the winding direction under overload is automatically arrested; however, when an overload develops after hoisting or pinching of a load, unwinding is possible. The apparatus includes an operation ring, and a friction ring and a drive ring both being capable of engaging the operation ring. When the driving ring is turned in the winding direction, the operation ring remains engaged with both the friction ring and the drive ring, enabling the relative rotation of the drive ring and the friction ring. When the drive ring is turned in the unwinding direction, the drive ring and the friction ring are rotated as a unit through the operation ring.

Abstract: A lever hoist comprises a change gear provided in a driving shaft 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 lever hoist further comprises a brake spring control member rotatably fitted on the driving shaft, a brake clamping spring arranged between the driving member and the brake spring control member, and a direction change transmission mechanism for transforming rotation of the brake spring control member into axial urging force of the brake clamping spring.

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.