The Padlock Patent Archive

Three centuries of keeping things shut

Anti-picking guard

Patent drawing sheet showing eight figures of a padlock: several face-on cutaway views of the lock body with numbered internal parts labeled with letters, a small ring-shaped tumbler guard, a tubular barrel key with a round handle, and a flat key variant, along with inventor's signature and witness signatures at bottom.PADLOCK.Frederick Egge · May 13, 1890