Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-01-11
1985-03-05
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
70284, G08B 1308
Patent
active
045034222
ABSTRACT:
A composite locking device comprises a case frame adapted to be connected to the inside of a door and a lock lever within the case frame. The lock lever is capable of lateral movement and has a first end which extends through the opening in the case frame to be received in a recess in a door jamb, and a second end within the case frame. The case frame includes a rotatable disk which is adapted to receive a key for laterally displacing the lock lever. A lockhead is fastened adjacent to the disk so that the key passes therethrough before it is received by the rotatable disk. The lockhead includes a power switch which is activated by insertion of the key, the power switch in turn activating a code switch. The code switch activates an electromagnet. A lock bolt is provided in the case frame which engages the lock lever. When the electromagnet is activated, it attracts the lock bolt away from the lock lever thus permitting lateral displacement of the lock lever by the key without activating an alarm. The improper opening of the locking device will thus cause the activation of an alarm providing a warning that an unauthorized entry is being attempted.
REFERENCES:
patent: 3858193 (1974-12-01), Bach
patent: 4030071 (1977-06-01), Barker
patent: 4064721 (1977-12-01), Morgan
patent: 4095239 (1978-06-01), Gerry
patent: 4333074 (1982-06-01), Sutherland et al.
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