The Padlock Patent Archive

Three centuries of keeping things shut

Hasp

Technical patent drawing showing three cutaway views of a padlock case with spring tumblers and a hidden safety bolt engaging a notched hasp, plus detail views of the bolt, bearings, and a double-bitted key.PADLOCK.George McGregor, Robert Lee, and Thos. G. Clinton · August 26, 1851Technical patent drawing of a heart-shaped padlock body with a curved shackle, hinged hasp, internal sliding bolts, springs, and a separate bit key, shown in nine labeled figures illustrating the lock's construction and operation.IMPROVEMENT IN PADLOCKSJacob E. Kohout · April 14, 1868Patent drawing of a heart-shaped padlock showing its back plate, internal arc-shaped spring bolt, tumbler, hasp, and separate key, across ten labeled figures.PadlockAndy M. Adams · April 12, 1870Patent 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 of a padlock with rounded shackle labeled B, an internal oscillating tumbler with numbered sliders, a circular notched fence, a hooked lever, and a flat multi-bitted key, alongside a separate hasp piece and cross-section details.IMPROVEMENT IN PADLOCKSJohn H. Ames · January 17, 1871Patent drawing showing an oval padlock in six figures: two face views with the case cut away to reveal an internal hook-shaped bolt, pivoted tumbler, and sliding slotted plate, a cross-section showing the key channel, and three detail views of the bolt, plate, and tumbler components.IMPROVEMENT IN PADLOCKSGeorge Merkel and Charles H. Meyer · April 4, 1871Patent drawing of a padlock mechanism showing four figures: a circular lock case interior with pivoting lever tumblers and a curved hasp, a flat sliding key with a toothed bit, and a side view of a similar lock with an alternate curved tumbler arrangement.IMPROVEMENT IN PADLOCKS, &c.Daniel K. Miller · October 28, 1873Patent drawing of a round padlock showing its exterior with a curved shackle and hasp, plus two internal views revealing pivoted slotted tumblers and springs in locked and unlocked positions, alongside a flat key.IMPROVEMENT IN PADLOCKSFredrick Egge · December 23, 1873Patent 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 showing a round padlock with a curved hasp, an internal circular spring bolt, and a series of small circular disk diagrams illustrating a rotating keyhole guard cap.IMPROVEMENT IN PADLOCKSGeorge R. Cutbirth · December 28, 1875Patent 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 U.S.-marked padlock showing exterior view, internal cross-section with bolt and tumblers, and a double-bitted key.IMPROVEMENT IN PADLOCKSWarren H. Taylor · July 10, 1877Patent drawing of a padlock showing its rounded shackle and body in Figure 1 alongside a tapered screw-key, with internal cross-section views in Figures 2 and 3 revealing a row of sliding threaded tumblers and springs, and Figure 4 showing the lock's interior lever and bolt mechanism with the side plate removed.IMPROVEMENT IN PADLOCKSWilliam C. McGill · April 1, 1879Patent drawing of a padlock showing its rounded shackle, tubular metal shell, and internal locking mechanism with lever tumblers, bolt, and springs in cross-section.IMPROVEMENT IN PADLOCKSWarren H. Taylor · August 5, 1879Patent drawing showing an oval padlock connected to a long chain with two loop rings, alongside a cutaway view of the lock's internal spring mechanism and two illustrations of the chain securing luggage to a bench and a rack.CHAIN-LOCK OR BAGGAGE-GUARD.Myron J. Clark · February 26, 1884Patent drawing of a cylindrical portable door-securer showing a threaded hasp, combination disks with letter markings, and a ring for attaching to a key chain, with ten labeled cross-sectional and detail figures.DOOR-SECURER.Daniel Bromley · January 19, 1886Patent drawing showing a round padlock with a curved hasp in both locked and unlocked positions, an internal spring-actuated bolt and tumbler mechanism visible through a cutaway casing, a cross-sectional view of the lock body, and a separate illustration of the notched key with a round head and stepped tip.PADLOCK.Frank W. Mix · October 26, 1886Cross-section drawings of a padlock showing an arched hasp, internal pivoted tumblers, coil springs, and a multi-notched push key beside detailed tumbler and plate components.PADLOCK.Cornelius S. Van Wagoner · June 11, 1895An exploded and assembled set of technical patent drawings showing a ring-shaped padlock formed of two hinged semicircular jaws with interlocking spear-shaped heads, a sliding spring bolt, a keyhole, and a warded key, labeled with reference letters A through S.LOCK.Woodbury D. Roberts · September 29, 1896Patent drawing sheet showing ten figures of a padlock design, including exterior side views, internal mechanism with levers, catches, and springs, individual component plates, a locking-bar assembly, and a specially shaped key with cut-away shank.PADLOCKMartin H. Lutz and Morrow Moore · June 15, 1897Patent drawing of a round padlock showing two interlocking hinged jaws with internal tumbler mechanism, pivot-bolt, spring, and a flat key with notched wards.LOCKWoodbury D. Roberts · April 12, 1898