Apparatus for visually indicating when a pool filter is dirty

Details Apparatus for visually indicating when a pool filter is dirty Apparatus for visually indicating when a pool filter is dirty

1974-09-27

1976-02-24

Queisser, Richard C.

Signals and indicators

Alarms

Fluid flow

137557, 210 90, B01D 3514

Patent

active

039397963

ABSTRACT:
Apparatus for indicating when a swimming pool filter needs to be cleaned, which comprises a flexible diaphragm covering an opening in the conduit on the inlet side of a pool filter and a housing covering the diaphragm with a movable piston member inside the housing and engaging the surface of the diaphragm. Spring means urges the piston against the diaphragm to counteract pressure of water in the conduit against the diaphragm. A movable flag is operated by the piston means to indicate through a window in the housing when the piston has moved a predetermined distance.

REFERENCES:
patent: 1227080 (1917-05-01), Schinkez
patent: 2902861 (1959-09-01), Frost et al.
patent: 3221704 (1965-12-01), Johannsen
patent: 3402690 (1968-09-01), Willis
patent: 3532069 (1970-10-01), Morgan et al.

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