Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-08-16
1996-07-23
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
340539, G08B 1306
Patent
active
055393780
ABSTRACT:
A safety lock having an alarm function includes a transmitter positioned in a main lock body, and a remote receiver with an alarm function. The transmitter is placed in a stand-by state by microswitches activated either by a manually-operated fixing member or movement of latch pins in response to a key, and triggered by a microswitch responsive to full extension of a deadbolt. Under normal conditions, the deadbolt is stopped from fully extending by an adjustable stop, the position of which can be adjusted to adjust the clearance between an extension of the deadbolt and the third microswitch. When the first or second microswitch is activated and the deadbolt disengages from the stop due to an attempt to open the door by prying, cutting, or otherwise forcing the door open, the deadbolt extends fully and the third microswitch is caused to close, triggering the alarm. A manual switch 33 can be provided to actuate the transmitter for test purposes and additional switches can be provided on the receiving device for testing or activating a long duration alarm.
REFERENCES:
patent: 4278967 (1981-07-01), Tanahashi
patent: 5311168 (1994-05-01), Pease, Jr. et al.
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