Tamper-proof axial tumbler type lock

Details Tamper-proof axial tumbler type lock Tamper-proof axial tumbler type lock

1977-11-23

1978-09-12

Wolfe, Robert L.

Locks

Operating mechanism

Key

70404, 70421, E05B 1514, E05B 1902, E05B 2708

Patent

active

041128206

ABSTRACT:
An axial tumbler type lock having a split cylinder within a stationary lock casing contains a set of regular spring-urged split tumblers which bridge the shear line to render the lock active and which are depressed to the shear line by a tubular key to allow turning of the lock to a release position. A modified split tumbler with a reduced forward pin extension also bridges the shear line of the lock and responds only to a special key having a forward pin extension for depressing the special split tumbler to the shear line. Additionally, the lock possesses one or more hidden tumblers in the non-rotational lock cylinder section which are spring-urged and have the capability of moving forwardly into the pocket for the special tumbler or into the pockets of any of the regular tumblers if the proper key is not employed to depress the special tumbler to the shear line, or if the rotational section of the lock cylinder is somehow turned without the proper key in place. Simplicity of construction and adaptability of the invention to a well-known "Ace" lock are featured.

REFERENCES:
patent: 3813906 (1974-06-01), Kerr
patent: 3916657 (1975-11-01), Steinbach
patent: 4006615 (1977-02-01), Szova

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