Closure mechanism for safety arm of an elevation hook. (Machine-translation by Google Translate, not legally binding)

摘要

Closing mechanism for the safety arm of a lifting hook, characterized in that the hook shaft has three cylindrical and coaxial areas at its connecting end to the cable, the diameters of which increase from the free end, positioning in the first zone an eye that it is trapped between a threaded nut on the end of the rod and a bowl with a central hole of diameter smaller than the diameter of the second zone by positioning in the second zone a spring that is attached at one end to the cane and on the other to the head of the security arm; said head having a hole coaxial to the axis of the cane and doubly stepped, matching the diameter of the first step with that of the outside of the bowl, the diameter of the second step being the diameter of the outside of the bowl, the diameter of the second step being greater that the outside of the spring which abuts on the inner base of the bowl at one end and on the base of the second step on the other, and presenting the lower base of the safety arm head a flat surface in contact with the upper base of the third zone of the cane, one of said surfaces having at least one projection that fits in a recess of the other surface. (Machine-translation by Google Translate, not legally binding)