The Padlock Patent Archive

Three centuries of keeping things shut

Staple lock

Patent drawing of a hasp-lock showing a long hasp arm H attached to a circular lock case c containing an internal bolt mechanism with tumblers, teeth, and a staple, alongside a cross-sectional view and an inverted bolt view labeled Fig. 1 through Fig. 4.IMPROVEMENT IN HASP-LOCKS.Conrad Fichter · April 2, 1878Patent drawing of a hexagonal padlock showing internal bolt, tumbler, spring-trigger plate, curved operating arm, and a key with notched projections, alongside an exterior perspective view of the locked case with staple.Padlock.William F. Hofmann · July 29, 1879Patent drawing showing a metal hasp with a circular broken locking ring mounted at one end, plus detailed cross-sections of the internal spring-loaded locking pin and a key-operated padlock variant.HASP-LOCK.Byron D. West · February 19, 1884Patent drawing of an egg-shaped padlock housing shown applied to a hinged hasp with a staple, plus a cutaway longitudinal section revealing an internal spring-loaded tumbler, bolt, and key mechanism.PADLOCKWilliam Gordon Parmele · July 14, 1925