The Padlock Patent Archive

Three centuries of keeping things shut

Brass case

Patent drawing showing an oval metal lock-and-label sheath (Fig. 1) with a circular padlock mechanism at top labeled 'WASHINGTON,' alongside several other oval and rectangular sheath shells, edge views, and detachable printed city-name labels including BALTIMORE, PHILADELPHIA, NEW YORK, NEW ORLEANS, and FREDERICKSBURG.COMPOUND LOCK AND LABEL-SHEATH.Samuel W. Marsh · April 3, 1860Patent 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, 1863Patent 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 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 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 sheet showing eleven figures of a cylindrical padlock, including exploded internal views with a rotating dust-cover plate, spring-loaded hook staple, tumbler mechanisms labeled E, and a bit key shown from side and end views.IMPROVEMENT IN PADLOCKSJacob L. Hirsch · January 4, 1876Two 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 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, 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 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 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 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, 1879Technical patent drawing showing the circular internal mechanism of a padlock with a curved vibrating bolt, pivoted lever, spring-loaded blocking piece, and a separate key-post and tumbler piece, alongside a cross-section view showing a barrel key inserted into the lock.Padlock.Frank W. Mix · March 9, 1880Patent 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 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 sheets showing a padlock with a round hinged shackle, internal bolt and lever tumbler mechanism, and a key inserted into the case, with multiple cross-sectional and detail views labeled with reference letters.PADLOCKDavid Waine and Isaac Waine · April 10, 1888Patent drawing of a round padlock with its face plate removed, showing an internal pivoted shackle, a hooked dog engaging tumbler notches, a detent-piece with an angled arm crossing the keyhole, and a stepped key with a notched shank labeled with numbered reference parts.PADLOCKWillard D. Doremus · May 7, 1889Patent 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 railway switch padlock showing the internal mechanism with shackle, tumblers, spring-loaded bolt, lever, and bell alarm, along with detail views of the key, tumbler-locking device, and case components labeled with reference letters.PADLOCK.George William Lucas · January 13, 1891Patent drawing sheets showing a U-shaped shackle padlock in exploded and assembled perspective views, with internal bolt, spring, plunger, and key-guide components labeled with letters and numbers.PADLOCKWilliam F. Troast and Samuel R. Slaymaker · January 23, 1894Patent 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, 1894Patent drawing of a padlock with side plate removed showing internal shackle, spring-loaded tumblers, locking-dog, and key-locking bar, plus a separate key and locking-dog detail views.PADLOCKGeorge M. Hathaway · September 25, 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 sheet showing eleven figures of a hasp padlock, including side elevations, sections, and detail views of the bolt, retaining-bar, ward-plate, key, and staple, with numbered reference lines pointing to internal parts.PADLOCKDaniel Krekes · May 16, 1899Cutaway drawing of a padlock showing a rounded shackle, internal rotating lock cylinder with spring-loaded bolt, and a flat notched key beside smaller detail views of the crown, sleeves, and bore cross-sections.PADLOCKHeinrich Biemer · March 15, 1927Patent drawing sheet showing a padlock with a U-shaped shackle and rectangular body, alongside detailed exploded and sectional views of the internal disc-tumbler lock insert, casing, bolt, and key plug components labeled with numbered reference lines.PADLOCKSamuel R. Fraim · January 31, 1933