Disc cylinder lock

Details Disc cylinder lock Disc cylinder lock

1990-07-09

1992-02-11

Gall, Lloyd A.

Locks

Operating mechanism

Key

70377, 70392, E05B 1514

Patent

active

050866311

ABSTRACT:
The lifting and rotating zeroes and the combination discs of a disc cylinder lock are provided with curved internal camming surfaces designed to mate with external curved camming surfaces on the key shank. The curved camming surfaces consist of segments of mathematically defined spirals, with non-uniform radii as measured from the lock axis.

REFERENCES:
patent: 3621689 (1971-11-01), Koskinen
patent: 3821886 (1974-07-01), Ladewig
patent: 4109495 (1978-08-01), Roberts
patent: 4267717 (1981-05-01), Martikainen
patent: 4418555 (1983-12-01), Uyeda
patent: 4512166 (1985-04-01), Dunphy et al.
patent: 4637234 (1987-01-01), Mielonen
patent: 4637240 (1987-07-01), Nevalainen et al.
patent: 4742703 (1988-05-01), DeWalch et al.

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