Method and apparatus for automatic switching

Details Method and apparatus for automatic switching Method and apparatus for automatic switching

1975-10-22

1977-05-03

Hohauser, Herman J.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

340258C, 361280, H01H 4712

Patent

active

040216799

ABSTRACT:
A method and apparatus for automatically switching a circuit to regulate artificial light in an area. The artificial light is turned on by a person entering the area and reflecting an ultrasonic wave pattern toward a receiver. The light is turned off by a person moving into contactless proximity of a capacitance comparison circuit which utilizes the capacitance of the human body as one of the circuit elements. The ultrasonic circuit operates at different levels of sensitivity, depending upon the existing available light in the area, such as during daylight hours. Optionally, a capacitance comparison circuit may be utilized for both turning on and turning off of the artificial light.

REFERENCES:
patent: 3459961 (1969-08-01), Ravas
patent: 3529214 (1970-09-01), Corn
patent: 3740567 (1973-06-01), Atkins
patent: 3836828 (1974-09-01), Siegel

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