Lock cylinder with variable keyway profile

Details Lock cylinder with variable keyway profile Lock cylinder with variable keyway profile

1994-07-12

1996-04-02

Gall, Lloyd A.

Locks

Parts, attachments, accessories and adjuncts

For key-operated mechanism

70384, 70407, 70420, 70494, E05B 1508

Patent

active

055029914

ABSTRACT:
The lock cylinder comprises a cylinder body wherein a cylinder plug (1) comprising a slot (2) for the key (18) of the lock is rotatable arranged. The profile of the key slot and therefore also of the key is determined by profile forming elements in the form of rotation bodies (6,7) which are inserted in bores (4,5) extending through the cylinder plug (1) parallel to and adjacent to the middle plane (10) of the key slot (2). The profile elements (6,7) may be made of hardenable steel, for instance by turning, and may comprise a number of portions of different diameters so that the total number of key profiles obtainable becomes high while permitting the key profile to be made very thin and correspondingly difficult to copy.

REFERENCES:
patent: 9787 (1881-07-01), Schade
patent: 446176 (1891-02-01), Shaw
patent: 4231242 (1980-11-01), Hill et al.
patent: 4296618 (1981-10-01), Guiraud
patent: 4356713 (1982-11-01), Widen
patent: 4608842 (1986-09-01), Tietz
patent: 4653298 (1987-03-01), Tietz
patent: 5088306 (1992-02-01), Field
patent: 5174141 (1992-12-01), Ohyabu

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