The Padlock Patent Archive

Three centuries of keeping things shut

Shackle lock

Patent drawing sheet showing seven numbered figures of a round padlock body with an oscillating bolt frame, notched sliders, a slotted flat key, and cross-sections revealing internal locking mechanism.IMPROVEMENT IN PADLOCKS, &c.Wilson Bohannan · August 6, 1867Patent 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 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 of a padlock with a curved shackle and round case, showing internal bolt, tumbler, and key mechanism in Fig. 1 and Fig. 2, with two small detail views (Fig. 3 and Fig. 4) of the tumbler component.IMPROVEMENT IN PADLOCKS.James J. Turner · December 25, 1877Patent drawing of an oval cast-iron padlock shown with its side plate removed, revealing a central shackle spindle surrounded by spring-loaded sliding tumblers, alongside separate views of the shackle and tumbler details.IMPROVEMENT IN PADLOCKSWilliam H. Bramble · July 30, 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 sheet showing twelve figures of a U-shaped shackle padlock, including exterior views, cross-sections revealing internal tumbler plates C and springs H, the key F, and a rotating guard plate L covering the keyhole.PADLOCK.William F. Troast · July 24, 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 padlock in cross-section showing a rounded shackle, internal tumblers, a sliding bolt, and a key-cylinder, accompanied by smaller figures of keys and internal gear-like tumbler mechanisms.PERMUTATION-LOCK.Eugene C. Smith · November 5, 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 a padlock with a U-shaped shackle atop a cylindrical lock body, showing internal cross-sections of a rotating tumbler cylinder, stacked disc tumblers, a locking bar, and a key with multiple bit slots, along with detail views of washers, caps, and an alternate pin-tumbler cylinder variant with a winged bolt.LOCKIra J. Babcock · November 29, 1898Patent drawing of a wrench with an adjustable jaw casing and a pivoted circular shackle at the handle end, shown in closed (Fig. 1) and open (Fig. 2) positions, with detail views of the locking bolt, key, and shackle mechanism in Figures 3 through 7.COMBINED LOCK AND WRENCHFrank Lombard and Charles Miller · May 23, 1899Patent drawing of a cylindrical permutation padlock showing an exploded barrel with letter-marked rotary tumbler rings, a threaded end cap, a shackle with locking projections, and a key-shaped pull, all labeled with numbered reference lines.PERMUTATION-PADLOCKCharles J. Evans · March 28, 1916Patent drawing showing a cone-shaped automobile lock with a hinged shackle bar, internal bell-crank levers and bolts, and a rotatable protective ring at the base, plus a view of the lock applied to a steering wheel with gas lever clamp.LOCK MECHANISM FOR AUTOMOBILES.Samuel H. Fish · December 18, 1917Patent drawing of a padlock showing the internal latch, spring, and lever mechanism in Fig. 1, and a vertical cross-section of the same lock with the shackle and dummy button in Fig. 2.SECRET COMBINATION LOCKJoseph Ciotola and Dominick Polidoro · May 23, 1922Patent drawing of a cylindrical padlock with a pivoted shackle, showing internal spring-loaded tumbler, stacked guide plates, and a fluted key with transverse notches designed to align with the internal plates.PADLOCKPeter Sczepczenski · February 17, 1931Patent drawing sheet showing six figures of a laminated padlock: an assembled side view with shackle and rivets, an end view, a bottom view with keyhole, two cutaway sectional views revealing internal spring, shackle arms, and locking plate, and a plan section showing the key and internal guard mechanism.LAMINATE LOCKJulius G. Sabo · December 15, 1931