Key for a lock cylinder

Details Key for a lock cylinder Key for a lock cylinder

1986-11-18

1988-11-29

Wolfe, Robert L.

Locks

Operating mechanism

Key

70402, 70407, 70393, 70395, E05B 1902

Patent

active

047872250

ABSTRACT:
For increased security the key (2; 40; 44) has one or more blade portions (43; 45; 46; 5, 6). The longitudinal central plane (A, B) of the or each blade portion is offset from the guide region (42; 7) running along the back edge of the key shaft (3). Furthermore, the or each blade portion is connected to the guide region by means of a bridging portion (14, 14') which forms an obtuse angle (alpha) with the guide region, as well as forming an obtuse angle with the blade portion. In one preferred embodiment two blade portions (45, 46; 5, 6) are provided; they may be of the same cross-sectional shape (FIG. 2) or symmetrical (FIG. 11). The blade portions and guide region may be divided into two portions to provide partner keys (FIG. 12).

REFERENCES:
patent: 1564883 (1925-12-01), Muzzio
patent: 1832498 (1931-11-01), Muzzio
patent: 2006374 (1935-07-01), Voges
patent: 2620649 (1952-12-01), Bernardo
patent: 3492842 (1970-02-01), Schlage
patent: 4429554 (1984-02-01), Litvin et al.
patent: 4498327 (1985-02-01), Preddey et al.
patent: 4603565 (1986-08-01), Strassmeire

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