The Padlock Patent Archive

Three centuries of keeping things shut

Bolt and staple lock

Patent drawing of a padlock-like lock mechanism (Fig. 1) with a curved internal passage, bolt, staple, and springs labeled A through R, alongside a flexible key (Fig. 2) with a handle, coiled wire shank, and toothed head labeled H through O.Flexible Key for Locks.Legrand J. Roberts · September 17, 1878