The Padlock Patent Archive

Three centuries of keeping things shut

Sliding bolt

Patent drawing sheet showing a round padlock mechanism in three states (locked, unlocked, hasp open), labeled internal parts including bolt C, dog D, rising-block E, and pinion F, alongside a bit key, individual component details, and two cutaway views of a trunk-lock variant with double hasps.IMPROVEMENT IN PAD AND TRUNK-LOCKSAndy M. Adams · November 8, 1870Patent drawing sheet showing six figures of a 19th-century padlock with a curved shackle arm, rotating face-plate with multiple key-holes, internal sliding bolt, tumbler, pinion and spring lever mechanisms, and a detachable key.IMPROVEMENT IN PADLOCKSDaniel Zeiler · February 27, 1872Patent drawing showing a round padlock with a J-shaped hooked staple, an interior view of the bolt mechanism, three variant sliding bolts, a cross-section of the case, the staple alone, and a separate key with a notched bit.IMPROVEMENT IN PADLOCKSHenry Essex · August 6, 1872Patent drawing showing a padlock hasp with a hooked eye, a rounded rectangular case, and cross-sections revealing internal notched tumblers and pivoting dogs that lock the bolt in place.IMPROVEMENT IN PADLOCKS, &c.Daniel K. Miller · December 22, 1874Patent drawing of a round padlock showing its exterior case, an internal cutaway with a hinged hasp secured by pivoting dogs and tumblers, a sliding bolt, and a corresponding notched key.IMPROVEMENT IN PADLOCKSRosewell Thompson · August 1, 1876Patent drawing of a heart-shaped padlock showing the internal mechanism with a pivoted tumbler, hooked arm, sliding bolt, springs, and a key inserted into the keyhole, alongside separate detail views of the tumbler/pawl assembly and the bolt.IMPROVEMENT IN PADLOCKSJames J. Turner · December 4, 1877Patent 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 long curved hasp with a hook-prong end, a cutaway lock mechanism with an internal sliding bolt and spring, a cam-notched key head, and a modified chain-attached hasp variant.HASP-LOCK.Charles P. Pond · June 30, 1885Patent drawing of a padlock showing four figures: two face views of the lock body with shackle open and closed revealing internal bolt and tumbler mechanism, a cross-section with the key inserted, and a detached perspective of the tumbler piece.PADLOCK.Arthur Stewart · July 6, 1886Patent drawing of a shield-shaped bicycle lock showing internal tumblers and bolts, a U-shaped hasp passing through the lock body, and a mounting clamp attaching the lock to a bicycle's steering head with the hasp threaded between wheel spokes.BICYCLE-LOCK.Edwin W. Macauley · August 23, 1892Patent drawing of a cylindrical combination chain lock showing a sectioned body with rotating letter collars marked A through K, an internal sliding bolt with keeper lugs, and end views of the bolt and locking collar.COMBINATION CHAIN LOCKWilliam Burkle · October 30, 1923