Dirty air filter indicator

Details Dirty air filter indicator Dirty air filter indicator

1978-06-29

1979-07-31

Yasich, Daniel M.

Signals and indicators

Indicators

Fluid flow

55274, 55DIG34, 116DIG25, B01D 3500, G01L 1912

Patent

active

041626605

ABSTRACT:
A dirty filter indicator for use with an air filter for an internal combustion engine, the filter comprising a replacement for an ordinary wingnut used to hold the outer cover of the air cleaner in position. The replacement nut has a bypass passage through it which communicates with the interior of the filter so that if the filter becomes dirty and clogged, a lightweight ball which is located in this passage and is normally biased to one position moves to a second position to indicate that the filter is dirty.

REFERENCES:
patent: 1863456 (1932-06-01), Smith
patent: 2655894 (1953-10-01), Rabbitt
patent: 2706463 (1955-04-01), Dunn
patent: 3068831 (1962-12-01), Witchell
patent: 3143997 (1964-08-01), Norberg et al.
patent: 3172746 (1965-03-01), Shuck
patent: 3312187 (1967-04-01), McKinlay
patent: 3381651 (1968-05-01), McKinlay
patent: 3736900 (1973-06-01), Nowicki
patent: 3914995 (1975-10-01), Yoshida
patent: 3977253 (1976-08-01), Lewis
patent: 4020783 (1977-05-01), Anderson et al.
patent: 4029041 (1977-06-01), Genshpring et al.

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