Locks – Operating mechanism – Key
Patent
1998-02-12
2000-11-14
Dayoan, B.
Locks
Operating mechanism
Key
70407, E05B 1904
Patent
active
061453579
ABSTRACT:
A flat key for a tumbler-containing locking cylinder of a locking apparatus, with a key grip and, attached thereto, a key shank for locking grooves cut into the shank towards the end surface, the shank having a basic profile exhibiting an essentially T-shaped cross-sectional configuration, of which the T-bar forms a guide bar with guiding surfaces, and of which the T-stem extending in the longitudinal mid-plane provides the end surface and has wide side surfaces for the provision of profile ribs that have curvilinear cross-sectional contours. The opposite disposed wide side surfaces (5, 6, 12, 13) each exhibit at least one longitudinal groove (7, 8, 15, 16) with a groove base extending beyond the longitudinal mid-plane (M--M), in which the groove side walls (7", 7'", 8", 8'", 15', 15", 16', 16") and the end surfaces (4, 14), seen in cross-section, extend circularly or elliptically tangentially from the wide surfaces (5, 6, 12, 13) in such a way that all of the profiling--profile ribs (17, 18, 19, 20), grooves (7, 8, 15, 16) and the end surfaces (4, 14)--of the wide side key surfaces have rounded front and flank portions.
REFERENCES:
patent: 4168617 (1979-09-01), Prunbauer
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patent: 4653298 (1987-03-01), Tietz
patent: 5131249 (1992-07-01), Sieg
patent: 5287712 (1994-02-01), Sieg
patent: 5493884 (1996-02-01), Hinz et al.
patent: 5809816 (1998-09-01), Widen
Definition of "Paracentric" from Webster's New International Dictionary, 2nd Ed., Circa 1952.
C. Ed. Schulte GmbH
Dayoan B.
Farber Martin A.
Vaterlaus Clifford B
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