The Padlock Patent Archive

Three centuries of keeping things shut

Chain lock

Patent 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 showing an oval padlock connected to a long chain with two loop rings, alongside a cutaway view of the lock's internal spring mechanism and two illustrations of the chain securing luggage to a bench and a rack.CHAIN-LOCK OR BAGGAGE-GUARD.Myron J. Clark · February 26, 1884Patent 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 showing an umbrella secured by a chain-and-ring lock to the arm of a train car-seat, with a satchel also attached, alongside detailed close-up views of the split ring-lock mechanism in open and closed positions.COMBINED UMBRELLA-LOCK AND SATCHEL-FASTENER.Timothy J. Leehey and James O'Connell · November 15, 1892A patent drawing of a wrench with adjustable jaws and a sharpened locking rod, connected by a chain to secure a bicycle wheel, alongside detail views of the internal locking mechanism and face-plate.COMBINED BICYCLE-LOCK AND WRENCH.Lemuel L. Powell · January 2, 1900Patent drawing showing a chain-and-block locking device with a rectangular casing, U-shaped link, chain, sliding key-operated block, and internal bolt mechanism, illustrated in four figures labeled Fig.1 through Fig.4.LOCKING DEVICERaymond K. Gray · August 9, 1921Patent drawing showing a chain-and-plug lock device attached to an automobile wheel rim and body, with cross-sectional views of the internal plunger bolt and key-actuated cylinder lock, plus a faucet fitted with a similar lock mechanism.AUTOMATIC SAFETY LOCK DEVICE.Otto H. Paschke · June 13, 1922Patent drawing of a cylindrical combination chain lock showing a sectioned body with rotating letter collars marked A through K, an internal sliding bolt with keeper lugs, and end views of the bolt and locking collar.COMBINATION CHAIN LOCKWilliam Burkle · October 30, 1923Patent drawing showing a curved chain with hook ends looping around a tire and rim, with a detailed cylinder lock and sliding bolt mechanism, plus separate sectional views of the chain links, studs, and lock body.LOCK MECHANISMColvin L. Johnson · April 21, 1931