Perfected safety chain. (Machine-translation by Google Translate, not legally binding)

摘要

Improved safety chain, characterized by comprising a chain whose free end runs through the groove and whose terminal stumbles against a stop provided under it, it being necessary to press on it to release said stop and that said terminal can reach the exit orifice provided a spring so that when placing the chain again it jumps the stop in the opposite direction by simple ramp avoiding the opening from the outside with some flat object. (Machine-translation by Google Translate, not legally binding)