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Pin-tumbler variant

Patent 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, 1898

United States patent drawings and specifications are works of the U.S. government and are in the public domain — they were never copyrighted. Download them, print them, frame them. Our commentary and descriptions are © 2026 The Padlock Patent Archive.

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