The Padlock Patent Archive

Three centuries of keeping things shut

19th century lock

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, 1851Two front-view line drawings of a padlock, one showing the exterior with shackle labeled B, and one with the front plate removed revealing internal springs, levers, and a rotating disk mechanism, plus a small horizontal cross-section below.PADLOCKI. J. Oldis · January 1, 1856Patent drawing of a heart-shaped padlock shown in three cross-sectional views with shackle up and down, plus separate detail drawings of three tumblers, a bolt, a lever, and a barrel key.IMPROVEMENT IN PADLOCKSConrad Liebrich · August 11, 1863Patent drawing of a round padlock with a curved shackle, shown in exterior view, sectioned interior with divided stop-pins and a turning block, a separate flat key with two pins, and a rectangular door-lock variant with a similar pin mechanism.IMPROVEMENT IN LOCKS.Thomas George Harold · November 24, 1863Technical 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 hasp lock showing a hinged latch-hook engaging a staple, a lock-case with internal spring-loaded bolt and multiple lever tumblers, and a flat key used to release the mechanism, illustrated in five labeled figures with a signature block for inventor Joseph S. Elliott.IMPROVEMENT IN HASP-LOCKSJoseph S. Elliott · May 12, 1868Patent drawing sheet showing nine figures of a padlock's internal cylinder mechanism, shackle, tumblers, and a socket key, with lettered parts and an inventor's signature at bottom.IMPROVEMENT IN PADLOCKSFrank F. Landis · May 12, 1868Patent drawing showing an oval padlock with a curved shackle, internal ring tumblers, a bolt mechanism, and an accompanying stepped key, presented in six labeled figures.IMPROVEMENT IN PADLOCKSJoseph Corbett · November 29, 1870Patent drawing sheet showing fifteen numbered figures of a heart-shaped padlock case, including cross-sections revealing stacked lever tumblers, a pivoted bolt, a U-shaped shackle with slotted prongs, and detail views of individual tumbler and bridge-plate components.IMPROVEMENT IN PADLOCKSSamuel W. Budd · January 23, 1872Patent 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 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 of a heart-shaped padlock interior mechanism alongside detailed views of a rotating key-hub and matching flat key with a bit-receiving slot.IMPROVEMENT IN PADLOCKSWilliam Wilcox · January 27, 1874Patent drawing of a round padlock showing six figures: the shackle and tumbler mechanism in locked and unlocked states, an exploded view of the lifted mechanism, a front elevation of the assembled lock, an edge view of the case, and a flat sheet-steel key shown from front and edge.IMPROVEMENT IN PADLOCKSFredrick Egge · July 14, 1874Patent 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, 1874Two cutaway diagrams of a round padlock showing the internal bolt, tumblers, and spring mechanism with the shackle at top, alongside a drawing of the irregularly-shaped thrust key.IMPROVEMENT IN PADLOCKSIsrael Donald Boyer · April 25, 1876Patent 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 padlock showing the bow-shaped shackle, internal locking bolt with teeth, sliding plug, and a dovetail-mounted sliding guard covering the key-hole on the underside of the case.IMPROVEMENT IN KEY-HOLE GUARDSChristian Eisele · May 22, 1877Patent 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 round padlock showing internal dog, tumblers, and pivoted shackle mechanisms across five figures, with a separate key illustration.IMPROVEMENT IN PADLOCKSFriend W. Smith and Fredrick Egge · September 4, 1877Patent 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, 1877Three sectional elevation drawings of a padlock showing internal mechanism including a pivoted shackle, spring-loaded lock-bolt, swinging dog, and key pin, labeled with letters A through L across Figures 1, 2, and 3.IMPROVEMENT IN PADLOCKSWilliam P. Yoe · January 1, 1878Patent drawing of a round combination padlock with a chain looped through two side holes, a dial and knob on top, and internal cutaway views revealing nested permutation rings and a locking bolt.IMPROVEMENT IN COMBINATION-PADLOCKS.Herbert M. King and S. Dermott Pierce · February 26, 1878Patent drawing of a tubular padlock showing a cylindrical lock case with a U-shaped shackle, internal cross-section revealing the bolt, spring, cam spindle and tumbler, plus separate detail views of the sliding clasp, spindle, tumbler, and a flat key with notched stem.IMPROVEMENT IN PADLOCKSHippolite A. Deraismes · March 5, 1878Patent drawing of a padlock showing its rounded U-shaped shackle, internal bolt mechanism in cross-section, lock cover with a cross-shaped keyhole, and two distinct flat keys used to operate the locking bolts and an independent shackle-retaining bolt.IMPROVEMENT IN PADLOCKSLouis Hillebrand · July 23, 1878Patent drawing sheet showing a heart-shaped padlock with internal spring tumblers, a hinged shackle, and two flat keys with stepped bits, labeled with reference letters for the case, dog, tumblers, and springs.IMPROVEMENT IN PADLOCKSWilliam Baldwin · November 19, 1878Patent drawing of a padlock showing cross-sections of the shell with tumblers, the U-shaped shackle with a lug, a locking-plate, key-tube, and an inverted view of the case.IMPROVEMENT IN PADLOCKSCharles W. A. Romer · March 18, 1879Patent 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 showing a padlock's internal cross-latch mechanism, a U-shaped shackle, a warded key, and several small toothed latch pieces labeled with reference letters.IMPROVEMENT IN PADLOCKSWilliam P. Wirth and Theodor Heinrich Wichert · April 22, 1879Patent drawing of a round padlock with a hinged hasp (Fig. 1), two enlarged cross-sections of the internal bolt and key mechanism (Figs. 2 and 3), and a perspective view of the notched key cylinder (Fig. 4).IMPROVEMENT IN PADLOCKSHenry A. Dodge · August 19, 1879Patent drawing of a padlock showing an internal rotating notched disk, gear segment, spring, anchor, and key mechanism in cross-section, with a shackle and a separate bent key illustrated below.IMPROVEMENT IN PADLOCKSConrad Jensen · September 30, 1879Patent drawing showing four views of a trunk permutation lock: a scalloped cover plate with tumbler recess, a hinged hasp with numbered dial and knob, the closed locked assembly, and a cross-sectional view revealing internal tumblers and pins.Permutation-Lock.Benjamin F. Kelly · January 11, 1881Patent drawing showing a trunk lock assembly with a front plate containing a keyhole and rotary bolt, a hinged hasp with a lettered permutation dial, internal lever and bolt mechanisms on the reverse plate, and separate detail views of a bit key and small locking plates.PERMUTATION TRUNK-LOCKJohn Kubler · December 6, 1881Patent drawing of a padlock with the side wall removed, showing an arched shackle, two hooked dogs labeled C and D engaging catches on the shackle, a slotted plate-lever G, tumblers E and F, and a separate detail view of a bit key with a notched blade.PADLOCKElihu L. Perkins · April 11, 1882Patent drawing of a padlock showing a curved metal shackle, internal notched tumblers, a pivoted dog, and a sliding bolt mechanism in cross-section, with separate detail views of the tumbler stack and key.PADLOCK.Milton Jackson · April 20, 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, 1886Patent drawing of a U-shaped shackle padlock showing internal spring-steel tumblers, a key inserted from below, and cross-sectional views labeled Fig. 1 through Fig. 8 with lettered parts such as A (case), B (shackle), C (tumblers), and F (key).PADLOCK.William F. Troast · December 31, 1889Patent drawing of a padlock showing the shackle, an internal eccentric dog and toothed tumbler mechanism, and a separate corrugated key with matching teeth.PADLOCK.Andrew S. Fisher · March 4, 1890Patent drawing sheet showing eight figures of a padlock: several face-on cutaway views of the lock body with numbered internal parts labeled with letters, a small ring-shaped tumbler guard, a tubular barrel key with a round handle, and a flat key variant, along with inventor's signature and witness signatures at bottom.PADLOCK.Frederick Egge · May 13, 1890Patent drawing of a padlock showing its curved shackle, internal pivoted tumblers with lugs and springs, and a flat stepped key used to release the mechanism.PADLOCKSamuel P. Stein · November 4, 1890Patent drawing sheet showing a round padlock with a curved hasp (B) and casing (A), plus eight numbered figures illustrating the internal sliding plate, pivoted tumbler sections, locking bolt, gears, and a flat key, with inventor's signature and witness signatures at bottom.PADLOCK.Willard D. Doremus · April 28, 1891Patent drawing of a padlock showing a U-shaped shackle, internal transverse bolt, springs, revoluble key-guide, and a barrel key with notched wards.PADLOCKJacob S. Peacock · May 26, 1891Patent drawing showing an oval metal lock case with a swinging multi-section locking dog engaging a two-shouldered bolt attached to chains, plus a small key and a padlock variant with a hook-shaped hasp.LOCK.Anson Parker Merrill · December 29, 1891Patent 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 padlock showing a U-shaped shackle inserted into a casing containing pivoted tumblers, sliding dogs, springs, and a twisted key mechanism, with seven labeled figures illustrating the internal parts and key.PADLOCK.Frederick W. Schultze · February 21, 1893Technical patent drawing showing exploded and sectional views of a padlock's internal casing, shackle, tumblers, dogs, catches, and a threaded key, with numbered reference lines identifying each part.PADLOCK.Ernst Wagenknecht · February 26, 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 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