It comprises comprising a hoist frame (250), a chain (300), chain driving means and a chain blockage detecting device (500) having a portion (506) movable relative to the hoist frame (250) and having a shaped opening (507) for allowing the chain links to pass through and preventing the entangled chain links to pass through when the chain (300) is driven. When the latter occurs the movable portion (506) is moved to the hoist frame (250) causing a signal to be output to the chain driving means such that the chain (300) is at least no longer driven in the same direction. Biasing means (600) are provided act against the movement of the movable portion (506) by the entangled chain for delaying the signal to be output.
Chain hoist
Kettenzug
Palan à chaîne
2018-01-10
Patent
Electronic Resource
English
IPC: | B66D Haspeln , CAPSTANS |