Locks – Operating mechanism – Key
Patent
1974-10-21
1976-10-12
Wolfe, Robert L.
Locks
Operating mechanism
Key
70378, 70394, 70419, E05B 1920, E05B 2704
Patent
active
039850102
ABSTRACT:
Method and apparatus for decoding twisting tumbler lock of the type wherein side bar is sole locking element and normally bridges shear plane unless radial apertures in twisting tumblers are all in vertical and horizontal register with complementary side bar protrusions. Decoding apparatus comprises three devices each with a blade insertable in keyway and having upwardly and rearwardly sloping front surface angulated at one of three angles to which tumblers must be twisted for horizontal registration of apertures. Each blade has indicia for indicating that front surface is at particular tumbler and further has indicia for determining amount of elevation of tumbler resulting from camming action between chisel shaped tumbler bottom and blade front surface when blade is advanced from initial engagement with tumbler to elevate tumbler. Method includes step of torquing blade during advancement to bias side bar toward tumblers and thus force protrusion into associated tumbler aperture when aperture registers with protrusion. This movement causes small but detectable resistance to further advancement and, thus, yields positive indication of registration. As angle of front surface is known and required tumbler elevation is known, tumbler is decoded. By repeating process with all tumblers, lock is decoded.
REFERENCES:
patent: 3604231 (1971-09-01), Buschi
patent: 3722240 (1973-03-01), Spain
patent: 3827151 (1974-08-01), Naill
Lock Technology, Inc.
Wolfe Robert L.
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