Double hook for crane has safety hook traps attached by one end to hook shaft so that they are able to rotate horizontally

摘要

The double hook has a safety trap for each hook . Each safety trap has one end able to turn vertically on the hook shaft and able to have the other end brought against the end of its hook by a spring. The safety traps can also rotate horizontally on the hook shaft. The may be attached to the hook shaft by means of a ring.