Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1977-11-18
1980-01-29
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
250221, 340539, 340323R, A63K 100, G01T 116, G08B 2300
Patent
active
041863887
ABSTRACT:
A proximity detector preferably utilizes a photoelectric cell, responsive to light beams emanating from a lamp carried by a tripod supported light projecting apparatus. Such apparatus includes a height adjustment utilizing a telescoping pair of tubes, one of which is supported by three tripod legs, each of which is adjustable in height. The lowermost regions of the tripod legs carry lockable wheels. The tubes are calibrated together with one another and indicate the total height of the light source utilizing a calibrated scale. The housing carrying the light source may be tiltable and locked into such position by a set screw arrangement. A filter may be utilized so as to provide polarized light beams or colored light beams, as desired. Another housing, equivalent to the housing utilized to carry the light source, encloses a photoelectric cell and a timer. When the light beam is interrupted feeding the photoelectric cell, the timer stops to operate and simultaneously an audible and visual alarm is sounded. A power supply is utilized having rechargeable batteries converted for recharging utilizing household utility voltage therefor.
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Caldwell Sr. John W.
Farkas Robert D.
Nowicki Joseph E.
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