| US 7,392,676 B2 | ||
| Key blank with projection | ||
| Charles W. Eden, Jr., Lewisville, N.C. (US) | ||
| Assigned to Kaba Ilco Corp., Winston-Salem, N.C. (US) | ||
| Filed on Feb. 02, 2007, as Appl. No. 11/701,687. | ||
| Application 11/701687 is a continuation in part of application No. 10/909567, filed on Aug. 02, 2004, granted, now 7,181,941. | ||
| Prior Publication US 2007/0220937 A1, Sep. 27, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. E05B 19/06 (2006.01); E05B 29/04 (2006.01) | ||
| U.S. Cl. 70—493 [70/409] | 39 Claims |
| 1. A key blank for a cylinder lock comprising:
a bow,
a blade longitudinally extending from said bow to a tip, and having a longitudinally extending upper edge having a front portion
to be cut with coded bitting for mating with a tumbler stack of a cylinder lock and a spaced, longitudinally extending lower
edge, and side faces which connect said edges;
upper and lower projections extending outwardly on respective edges adjacent the bow, the upper projection rising about a
vertical centerline from a reference elevation e0 below the elevation e1 of the front portion of the upper edge to a nose at an elevation e3 above said elevation e1, and extending a length parallel to the upper edge that is greater than a width transverse to the edge;
wherein said upper projection has a convexly contoured longitudinal cam surface facing the tip of the blade and a convexly
contoured longitudinal cam surface facing the bow, which converge toward said nose.
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