Method and apparatus for decoding twisting tumbler locks and loc

Details Method and apparatus for decoding twisting tumbler locks and loc Method and apparatus for decoding twisting tumbler locks and loc

1974-10-21

1976-10-26

Wolfe, Robert L.

Locks

Operating mechanism

Key

70378, 70394, 70419, E05B 1800, E05B 2700

Patent

active

039876543

ABSTRACT:
Methods and apparatus for decoding twisting tumbler locks and improvements in such locks to resist such methods and apparatus. To determine depth of cut of bit for a given tumbler, a blade is inserted into key way to position a wirelike probe at tumbler to be decoded. Wirelike probe is advanced upwardly until it engages tit at top of tumbler. Depth of cut of key bit is function of length of tumbler and device can be calibrated to give direct readout of depth of bit cut. Angle of key bit can be measured by hooking a wirelike probe in side gate groove in tumbler and then twisting tumbler until tit engages key plug or shell. Amount of twist permitted is function of angular position required to register tumbler groove with side gate and device can be calibrated to give direct reading of such angle. To defeat depth of cut decoder, twisting tumbler lock wherein tits on tumblers are located at different distances from tops of tumblers is disclosed. Another form of modified twisting tumbler locks that will defeat decoding methods and apparatus herein is tumbler with side gates receiving grooves 180.degree. apart and with no tit.

REFERENCES:
patent: 14958 (1856-05-01), Hendrickson
patent: 2791840 (1957-05-01), Harwell
patent: 3499302 (1970-03-01), Spain
patent: 3837197 (1974-09-01), Lopez

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