The Padlock Patent Archive

Three centuries of keeping things shut

Push key

Patent drawing showing a semicircular metal lock case mounted on a door jamb pin, with internal bolt and tumbler mechanism labeled with letters, alongside a separate bit key and a side elevation of the door and jamb assembly.LockWilliam H. Butler · October 28, 1856Patent drawing sheet showing eleven figures of a shackle padlock, including exterior front views, interior mechanism views with bolt, tumbler, and spring, an edge cross-section, and detached parts like the bolt shank and tumbler.IMPROVEMENT IN PADLOCKSMoses T. Ridout · September 9, 1862Patent 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, 1868Cutaway drawing of a curved-frame padlock showing an internal spindle, sliding cup, cone, and pivoted catch bar, with a circular cross-section view below labeled with letters A through F.IMPROVEMENT IN PADLOCKSAmos S. Blake · November 17, 1868Patent 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 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, 1877A whimsical padlock cast in the shape of a hooded child's head and shoulders, with one arm bent so the hooked hand is inserted into the open mouth to lock the shackle.IMPROVEMENT IN PADLOCKS.John Gérard · September 11, 1877Patent 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 round padlock showing internal hooked dog, tumbler springs, and lettered parts, with a separate flat push key and cutaway views of the shackle open and closed.IMPROVEMENT IN PADLOCKS.Frederick Egge · August 27, 1878Patent 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 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 showing five figures: cutaway side views of the lock body with shackle, spring bolt, and pivoted tumbler mechanism, plus a cross-sectional view of the key.PADLOCK.Wilson Bohannan · May 19, 1885Patent drawing of a Scandinavian-style padlock showing a cutaway body with shackle B, notched tumbler C, clutch plate D, interchangeable wards G H I, and a spring-loaded key E with double bits, alongside smaller face-view details of the tumbler, clutch, and wards.PADLOCK.Samuel McCarter · July 28, 1885Patent 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 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 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, 1893Patent drawing of an 1894 padlock showing five figures: a cutaway shackle-and-casing assembly with numbered internal tumblers and springs, a perspective view of the internal locking frame with stacked notched tumblers, and a bottom plan view of the lock casing with keyhole and slot details.PADLOCK.Benjamin F. Loughmiller · April 10, 1894Cross-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, 1895Patent drawing showing a chain lock assembly with a round casing housing internal tumblers, a key, and an open link, alongside a diagram of the device mounted on a spoked wagon wheel securing it to the wagon body.LOCKING-CHAINJohn U. Barr · August 16, 1910Patent drawing sheet showing an exploded padlock with an arc-shaped shackle, circular actuator plate with teeth and slots, cam members, connecting links, and a multi-pronged key, alongside cross-sectional and detail views labeled with numbered reference lines.LOCKYancey Q. Caldwell · September 12, 1911Patent 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