Limited Rotation of Key Lock Flag Achieved at Connection to Lock Plug.
Original Publication Date: 2000-Sep-01
Included in the Prior Art Database: 2003-Jun-20
This invention addresses the problem of allowing a lock cylinder to rotate the standard 90 degrees while limiting the rotation of a lock flag in order to avoid undesired component interference. Typically, a key lock has a square or rectangular feature on the end of the key lock plug where the lock arm or cam connects. This invention uses the existing standard square feature of a typical small lock incorporating it as the driving "gear" of the mechanism. The hole in the lock flag is created by taking the typical square feature and rotating it through the desired angle thereby determining the perimeter of the cut-out portion (see Fig. 1 below). Figure 1 Hole shape created by rotated geometry This rotated angle subtracted from 90 degrees represents the total desired rotational angle of the lock flag. The net effect is a controlled rotation of the lock flag to the desired angle driven by the full 90 degree rotation of the lock cylinder. A spring and spring spacer are bolted outboard of the lock flag to hold the flag in place during rotation. Figs. 2 and 3 below illustrate an example of this type of compact lock, flag, and spring assembly. [Figure 2 Lock flag assembly]