Locks – Operating mechanism – Key
Reexamination Certificate
2005-04-19
2005-04-19
Gall, Lloyd A. (Department: 3676)
Locks
Operating mechanism
Key
C070S368000, C070S369000, C070S371000, C070S416000, C070S424000, C070S455000
Reexamination Certificate
active
06880376
ABSTRACT:
This invention relates to an anti-twist key lock with changeable locking device, the anti-twist key lock having a key lock case, on the circumference of the key lock case having a slit and an opposite inner groove. A locking tumbler set is installed in the key lock case for interlocking the lock bolt and a front plug with receiving groove is inserted into the open end of the key lock case, then using an U-shape locating retainer to insert into the receiving groove of the front plug from the slit on the key lock case to locate the front plug and make it can be rotated freely to prevent the key lock from attacking or twisting to unlock by vandals or thieves, furthermore, the locking tumbler set can be changed by removing the U-shape locating retainer with a special tool.
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