The Padlock Patent Archive

Three centuries of keeping things shut

Lever tumbler

Patent 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 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 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 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 padlock showing eight labeled figures: interior views of the lock case with shackle open and closed, the spring-bolt with a stepped stud, pivoted tumblers, and a beveled-ward key.IMPROVEMENT IN PADLOCKSHerrmann Ahrend · January 27, 1874Patent 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 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, tubular metal shell, and internal locking mechanism with lever tumblers, bolt, and springs in cross-section.IMPROVEMENT IN PADLOCKSWarren H. Taylor · August 5, 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 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 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 cylindrical padlock showing a cross-section with a U-shaped shackle, stacked internal tumbler plates labeled with letters, and several smaller diagrams of the individual tumblers, plates, and a bit key.PADLOCK.Jacob B. Amwake · October 29, 1889Patent 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 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 showing exterior view, internal bolt-and-tumbler mechanism with numbered parts, cross-sections, individual component details, and the setting key.PADLOCK.Warren H. Taylor · July 20, 1897