High security lock

Details High security lock High security lock

1998-01-09

1999-10-12

Boucher, Darnell M.

Locks

Portable

Padlocks

70340, 70379R, 70419, E05B 6722

Patent

active

059641088

ABSTRACT:
A high security lock includes a housing defining an interior chamber having a longitudinal chamber axis and a keyway axially through the housing into the chamber. A cam arrangement within the chamber defines an access in axial alignment with the keyway. The cam arrangement includes a plurality of stationary raceway cams arranged in parallel planes and concentric to the chamber axis. Each raceway cam has a radially-inward surface forming a bearing raceway. The cam arrangement further includes at least one stationary locking cam arranged in a plane parallel to the raceway cams and concentric to the chamber axis. The locking cam has no such bearing raceway. A tumbler assembly is disposed within the chamber and cooperates with the cam arrangement for selective rotational movement within the access about the chamber axis. The tumbler assembly includes a plurality of bearing elements supported for axial movement relative to the cam arrangement. A key is insertable into the keyway and has a plurality of shoulders adapted for engaging and moving the plurality of bearing elements axially from an inoperative disposition to an operative disposition. A locking member is mounted to the housing for movement between a retained position engaged by the tumbler assembly when in its locked disposition, and a released position disengaged by the tumbler assembly when in its unlocked disposition.

REFERENCES:
patent: 1256168 (1918-02-01), Schechter
patent: 2391834 (1945-12-01), Johnstone
patent: 2982121 (1961-05-01), George
patent: 4802354 (1989-02-01), Johnson
patent: 4934164 (1990-06-01), Shew
patent: 4967578 (1990-11-01), Shew et al.
patent: 5148690 (1992-09-01), Wang
patent: 5592837 (1997-01-01), McBride

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