Signals and indicators – Indicators – Fluid flow
Patent
1981-03-24
1983-06-28
Yasich, Daniel M.
Signals and indicators
Indicators
Fluid flow
250231P, 350 97, 356373, G01D 528, G01L 1912, G08B 518
Patent
active
043899625
ABSTRACT:
An optical display unit for pneumatic systems, having a housing with a transparent cover at one end. A mirror part is provided from which light may be shut off by a moving shutter acted upon by a change in pressure, for example an increase in pressure, in a space to be monitored. The body of the display unit takes the form of a hollow guide stem, whose one end has the transparent cover thereon and which has within it a nonmovable inner part with the mirror part as its one end. At the other end of the guide stem there is provided a piston which is able to be moved backwards and forwards and which is loosely joined with a sleeve for moving same. The front end of the sleeve has the shutter thereon for covering up the mirror part. The sleeve is adapted to encircle the nonmovable inner part and is guided in the guide stem.
REFERENCES:
patent: 2676515 (1954-04-01), Diehl
patent: 3181496 (1965-05-01), Bilbrey
patent: 3249760 (1966-05-01), Miller
patent: 3639998 (1972-02-01), Mason
patent: 4072126 (1978-02-01), Kemp
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