Load limiting apparatus for hoists

摘要

The improved load limiting apparatus includes a chainwheel that is mounted on the hoist drive shaft and adapted to receive the drive chain. The chainwheel includes a hub connected to the drive shaft, an annular clamping member located in juxtaposition to the hub and adjustably attached thereto, and an annular chainwheel rim located in encircling relationship to the hub and clamping member and having a bifurcated flange in frictional engagement with the hub and clamping member, whereby the rim can move relative to the hub and clamping member after a pre-determined torque load is imposed on the rim by the drive chain.