E - Fixed Constructions
05
B
70/54
E05B 27/06 (2006.01) E05B 19/00 (2006.01) E05B 15/16 (2006.01)
Patent
CA 1316362
Abstract The invention relates to a lock having an outer casing and a lock cylinder rotatably mounted therein and having a coaxial keyway of round cross section plus several rows of radial bores to accommodate the tumblers and their springs, and also having a key which has notches on its outside profile for the engagement each of a tumbler. The key has an equilateral polygonal bit cross section which matches the cross section of the keyhole in the front wall of the lock casing as well as a coaxial opening in the lock cylinder bottom, these cross sections of the keyhole and bottom opening being angularly offset from one another. The tip of the key bit has ramp surfaces corresponding to the rows of the tumblers, ascending toward the bow or handle of the key, and terminating each at one polygon face for the purpose of raising the tumblers, and the rows of notches are disposed between the polygon faces. The axial length of the polygonal cross section of the key is not greater than the length of the keyway in the lock cylinder and the adjoining portion of the key shaft is able to turn in the keyhole.
550887
Knauer Oswald
Fetherstonhaugh & Co.
Knauer Oswald
LandOfFree
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