Automatic control for an adjustable member

Details Automatic control for an adjustable member Automatic control for an adjustable member

1977-07-21

1979-12-25

Schwadron, Martin P.

Fluid handling

Ambient condition change responsive

Burner gas cutoff

13762411, 239 63, 250214AL, A01G 2516, H01J 3912

Patent

active

041800877

ABSTRACT:
A switching arrangement for the control of an adjustable member such as a valve includes a light sensitive switch. Detection of a particular light value enables a frequency divider to transmit an opening pulse to a valve control circuit a predetermined delay period after the detection of such light value. The frequency of an output signal of a pulse generator is varied in response to the opening pulse and the frequency divider transmits a closing pulse to the control circuit after a second predetermined time period of different duration from the delay period. In one disclosed embodiment, control of the frequency divider is responsive to moisture content of soil as well as ambient light level for application in automatic sprinkler systems.

REFERENCES:
patent: 2946512 (1960-07-01), Richards
patent: 3500844 (1970-03-01), Sanner
patent: 3590335 (1971-06-01), Tetar
patent: 3665224 (1972-05-01), Kelsey
patent: 3777976 (1973-12-01), Milovancevic
patent: 4114647 (1978-09-01), Sturman et al.

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