Locks – Special application – For closures
Patent
1991-01-07
1992-05-19
Gall, Lloyd A.
Locks
Special application
For closures
70153, 70214, 70279, 70283, 70478, 292358, 292359, E05B 1310, E05B 4706
Patent
active
051136759
ABSTRACT:
An intermediate locking mechanism which is interposed between the existing door bolt works and the door knob of a standard key door lock, which can be unlocked by use of either a key or by entry of an electronic code, the mechanism includes the provision of an interconnecting means for interconnecting the door knob to the door bolt with which manipulation of the door knob withdraws the door bolt, a securing means for securing the interconnecting means to preclude its manipulation, an electrically operated means for unlocking the securing means by entry of an electronically entered combination code and a mechanical key operated means for unlocking the securing means by manipulation of a key. After entry of the combination code, the electrically operated means manipulates the securing means from a first normally locked position to a second position enabling unimpeded operation of the mechanism. Rotation of a key causes the mechanically operated means to disengage the securing means, also enabling unimpeded operation of the mechanism.
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