Title: Photoelectric start-stop controls for gas burner

Abstract: A device for electrically starting and stopping the operation of a gas burner in response to the shadow of the user's hand holding an object to be heated, the device including a solenoid valve in the gas line and a dimmer circuit with a directional photoelectric sensor, a switching amplifier, and a valve relay controlling the solenoid valve. The dimmer circuit can be bypassed for continuous operation by means of a selector switch.

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Inventors: Strunz, Alfred (Rietberg, DT)
Rohrer, Jurgen (Gutersloh, DT)

Application Number: 642571
Filing Date: 1975-12-19
Publication_date: 1977-06-07
Assignee: Firma Dr. Th. Wieland (Pforzheim, DT)
Primary Class(es): 431/355 126/234, 126/238, 431/6, 431/79
Other Classes:
US Patent Ref:

736321	Aug, 1903	Walther	126/234.
3188836	Jun, 1965	Kniebes	431/18.
3723045	Mar, 1973	Reese	431/18.

Other Refs:
Primary Examiner: Favors, Edward G.
Assistant Examiner:
Attorney: Geiger; Joseph A.