| 摘要 |
The object is to provide a chain hoist with an overload prevent device, ensuring an easy and secure adjustment of load limit numerical values. It comprises a pressing drive member 8 for pressing and rotating a pressure receive member 7 by way of a backstop wheel 11 and friction members 9 and 10, and an axially displaceable, rotary drive member 14 adapted to transmit a rotational force of a hand chain wheel 15 to the pressing drive member. The rotary drive member is urged toward the pressing drive member by a belleville spring 24. The pressing drive member and the rotary drive member have lock teeth 80 and 140 that are formed on their respective confronting faces. The lock teeth 80 and 140 include steeply sloped wind-down press faces 80a and 140a, respectively, and gently sloped wind-up press faces 80b and 140b, respectively. A rotation limit member intervenes between the rotary drive member 14 and the belleville spring 24 in order to prevent a rotational force of the rotary drive member from being transmitted to the belleville spring and a nut 25 even though the rotary drive member is rotated while climbing over the gently sloped faces in an overload condition.
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