Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-10-07
1982-06-08
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
200 6147, 200 6193, 340541, 340545, G08B 1302
Patent
active
043342183
ABSTRACT:
A motion sensing circuit has a plurality of motion sensitive switches connected serially therein and which conduct a quiescent current through the circuit in one stable condition whereas in another stable condition of said switch above a upper limit of the tripping, the quiescent current flow is re-established and, in between the current through the switch is interrupted. In both stable conditions the switch represents a short circuit, that is current flows through the circuit, while between the two stable conditions the current is interrupted and a registering device at the output of the circuit will sense such tripped or alarm condition.
The switches according to the present invention employ mercury as the moving contact and a pair of rotational body-shaped rest contacts within the tripping sensitive switch. The rotational body-like shaping of the motion sensing switch causes the mercury to flow from one stable condition into the other during the tripping quickly. With the aid of a contact stub protruding from one of the rest contacts, an interruption of the current between the two contacts during tripping is provided.
The motion sensing apparatus according to the present invention finds application in automobiles, buildings, and other structures as an alarm device wherein a plurality of switches can be placed at various locations and perform the observation of the object assigned independently of each other.
REFERENCES:
patent: 3599745 (1971-08-01), Hughes
patent: 3962696 (1976-06-01), Smith et al.
patent: 3997890 (1976-12-01), Kendrick, Jr.
patent: 4042796 (1977-08-01), Zink
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