Changeable combination lock
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 17, 2000
Grant Date -
N/A
app pub date -
Aug 7, 1998
filing date -
Aug 18, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A combination of the inventive combination lock can be easily and conveniently changed by the user. A clutch selectively disengages the drive tumbler from the lock spindle. With the drive tumbler disengaged and the tumblers in an aligned position, the user rotates the lock knob by a desired increment, thereby changing all of the numbers by the increment. In one embodiment, the clutch is operated by a cup mounted around the drive cam and engaging the drive tumbler, a spring biasing the drive tumbler against the cup and the drive cam, and the cup carrying a button that, when pressed, moves the drive tumbler out of engagement with the drive cam. In another embodiment, the clutch is operated by a thumb screw projecting through a rear panel of the combination lock that moves an upper part of the drive cam out of engagement with a lower part of the drive cam, allowing relative rotation of the lock dial and the drive tumbler.
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