Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1980-12-19
1982-12-14
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
33111, G08B 2100
Patent
active
043640346
ABSTRACT:
A thin wire with known properties of thermal expansion is suspended under constant tension between two fixed points and passes through an aperture in a measuring plate mounted on a wall or ceiling. The plate is mounted to permit relative movement of the plate with respect to the wire so that the plate aperture can be initially centered with respect to the wire. A pair of cursors are movably mounted on the plate relative to the aperture and have intersecting or overlapping cursor elements which cooperate with linear measurement scales on the plate to enable the operator to establish coordinates for the cursor element intersection point as an aid in placing the plate aperture at a location where the wire is at the center of the aperture. At periodic intervals the cursors are realigned with the wire to determine the wire's coordinates and whether the plate aperture has moved from its initial location relative to the stationary wire. An automatic electric alarm may be provided which includes a plurality of electrically conductive metal foil elements positioned about the periphery of the aperture and which signals upon movement of the wire beyond a predetermined distance within the aperture.
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Bellatty Thomas A.
Mast Richard
Zadik Joseph S.
Robinson, Jr. Lee C.
Swann III Glen R.
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