Combination lock extraction apparatus

Details Combination lock extraction apparatus Combination lock extraction apparatus

1978-01-26

1980-03-25

Wolfe, Robert L.

Locks

Operating mechanism

Key

70369, 70DIG42, E05B 2708

Patent

active

041943783

ABSTRACT:
The following specification describes a plurality of combination lock cylinders, each of the axially movable tumbler pin type and each having a drive plate initially rotatable in a selected one of two directions by the tumbler operating pins of a respective operating key to control a bolt. A lock cylinder extraction key having tumbler pins universal to each lock cylinder rotates the drive plate in the direction opposite the selected direction to align a slot in the drive plate with a boss in the housing for enabling removal of a respective lock cylinder from its housing.
Each lock cylinder has one pair of bayonet slots extending in the selected direction and engaged only by bayonet pins on the respective operating key for enabling rotation of the drive plate only in the selected direction and another pair of axially offset bayonet slots extending in the opposite direction and engaged only by bayonet pins on the lock cylinder extraction key to enable rotation of the drive plate only in the opposite direction.

REFERENCES:
patent: 3174315 (1965-03-01), Williams
patent: 3648492 (1972-03-01), Walters
patent: 3785182 (1974-01-01), Van Lahr

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