Idling device for lever hoist

Abstract

An idling device is able to bring into an idling condition a lever hoist including a change gear provided on driving member threadedly engaged on 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 adapted to be clamped and released by rotative movement of the driving member relative to said driving shaft. According to the invention the idling device comprises a change-over knob fitted on the driving shaft axially slidably but against rotation and a manually operatable knob fitted on and rotatably and axially slidably relative to the driving shaft between the change-over knob and the driving member and provided with engagement recesses adapted to be engaged in protrusions formed in the driving member. The manually operatable knob is formed with engagement recesses in a bottom of its cavity for receiving the change-over knob. The change-over knob is formed with engagement protrusions to be received in the engagement recesses of the manually operatable knob in the idling condition. The manually operatable knob is further formed with engagement surfaces in opposition to the engagement protrusions of the change-over knob for preventing the change-over knob from moving away from the driving member.