Patent Number: 6,305,200

Title: Keyway plug

Abstract: A keyway plug that provides a means for preventing the correct key from opening a tumbler lock, including a plug and an extractor. The plug fits into the keyway to block complete insertion of a key. An arm extends from the tip of the plug across the tumblers, but is short enough so that the outermost tumbler drops to hide the plug. The extractor includes a narrow finger, the end of which pushes the innermost part of the plug upwardly, while the tumblers push the outermost part of the plug downwardly. A chamfer at the outer end of the plug arm pushes the outermost tumbler up out of the way so the plug can be removed. The upper edge of the finger includes a hook that mates with a matching notch in the lower edge of the plug arm. As the extractor is removed, the hooks and notch interlock, pulling the plug from the keyway.

Inventors: Moen; Richard C. (Brewster, MA)

Assignee:

International Classification: E05B 17/16 (20060101); E05B 17/00 (20060101); E05B 017/14 ()

Expiration Date: 10/23/2018