| 摘要 |
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 stopper fixed to the driving shaft and a manually operatable knob fitted on and rotatably and axially slidably relative to the driving shaft between the stopper and the driving member and provided with engagement protrusions adapted to be engaged in recesses formed in the driving member. The knob is formed with stopper protrusions integrally on a bottom of its cavity for receiving the stopper. The stopper is formed with recesses for receiving the stopper protrusions in the idling condition and is further formed with engagement surfaces in opposition to the stopper protrusions of the knob for preventing excess release of the braking assembly.
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