The Padlock Patent Archive

Three centuries of keeping things shut

Spring bolt

Patent 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 heart-shaped padlock case with a pivoted curved shackle, internal spring-loaded bolt and tumbler mechanism, and separate detail views of the tumbler and bolt components.IMPROVEMENT IN PADLOCKSWilson Bohannan · June 25, 1878Patent 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 showing an elongated metal hasp plate with a recessed slot displaying the words NEW YORK as an address tag, alongside a separate lock case with an internal pivoted hook and bolt mechanism shown in cutaway view.COMBINED TAG-HOLDER AND HASP-LOCK.Robert W. Greene · February 21, 1888Patent 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, 1899A 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 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 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, 1931Patent 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