Communications: electrical – Condition responsive indicating system – Specified indicator structure
Patent
1996-08-13
1998-08-25
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specified indicator structure
340628, 340690, 307117, G08B 2508
Patent
active
057987041
ABSTRACT:
An earthquake escape light system having several different triggering systems. In one system vibrations are sensed as several steel balls move between two plates with the upper plate being connected to an upright member. At the lower end of this upright member is a steel ball normally electrically insulated from a lower conducting surface. Vibrations will cause the steel lower ball to contact the lower conducting surface and complete an electrical path to a light source. Alternately, the upper plate may have an arm with a hook end attached to it. This end restrains a pivotally mounted tube with mercury within from completing an electric circuit to a light source. When vibrations occur the hook comes off to complete the circuit. In another embodiment two magnets normally equally attract the free end of a electrically connected spring. When this end is subject to vibrations one of the magnets attracts it to complete a circuit to a light source. Sound above a specific level may also be used to complete an electrical circuit to a light source.
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Hofsass Jeffery A.
McGlynn Joseph H.
Tweel, Jr. John A.
Zack Thomas
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