Alarm modification for meteorological instrument

Details Alarm modification for meteorological instrument Alarm modification for meteorological instrument

1982-04-16

1983-11-22

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

250215, 250231R, 340601, 346 17, G08B 2100

Patent

active

044172389

ABSTRACT:
An alarm modification kit for adding an electrical alarm signal feature to a mechanical recording type meterorological instrument. The kit includes a counterbalanced shutter arm adapted to be secured to the output shaft of the instrument which carries the recorder pen without disturbing the output shaft in its mountings. The free end of the shutter arm is T-shaped with a notch located centrally therein. A U-shaped photo source-sensor assembly is adjustably positioned astride the free end of the shutter arm so that the cross member of the arm moves transversely between the legs of the source-sensor, preventing generation of an electrical signal therefrom until the notch of the shutter arm is moved into alignment with the source-sensor.

REFERENCES:
patent: 2169465 (1939-08-01), Hadley
patent: 2903321 (1959-09-01), Maude
patent: 3249759 (1966-05-01), Sendro
patent: 4300548 (1981-11-01), Jones
patent: 4327583 (1982-05-01), Fujimoto

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