Dust shutter assembly for locks
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United States of America Patent
Stats
-
Nov 21, 1995
Grant Date -
N/A
app pub date -
Sep 12, 1994
filing date -
Sep 12, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved dust shutter assembly for locks includes a floating hinge point which decreases the amount of axial key force that is necessary to overcome the spring bias in the dust shutter mechanism. When engaged by a key, the spring retention pin (hinge point) of the dust shutter mechanism moves within the pin slots of the lock plug cavity until it bottoms out against the back of these slots. Pin translation is primarily axial, in the direction of key insertion, which partially unloads the spring and reduces the amount of key force that is required to open the shutter door. Since less key force is necessary, a narrower shutter door can be used. The chief advantage of a narrower shutter door includes a corresponding reduction in the size and length of the entire lock assembly.
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