High safety lock devices
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United States of America Patent
Stats
-
Aug 21, 1984
Issued Date -
N/A
app pub date -
Feb 3, 1982
filing date -
Jan 18, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A safety lock is provided with two plate assemblies, the first to be mounted on the outside of the door leaf and the second on the inside thereof. Each one of these plate assemblies comprises a first plate adapted to be placed on the side of the door leaf and having a first opening for receiving an actuating mechanism, a second opening housing a transmission gear mechanism, and corner holes for passing fasteners which hold the two plate assemblies together. A second plate is on the outer face of the first plate which comprises holes providing bearings for each gear of the transmission mechanisms as well as holes wider than the ends of the fasteners for housing the same therein. A third plate is spot welded on the outer face of the second plate and prevents access to the transmission mechanism. In the outer plate assembly, this third plate covers the ends of the fasteners and has only one hole, shaped in correspondence with the respective key hole opening of the cylinder lock.
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