Air filter condition indicator

Details Air filter condition indicator Air filter condition indicator

1993-03-08

1994-07-05

Williams, Hezrone E.

Measuring and testing

With fluid pressure

Leakage

73 38, G01M 300

Patent

active

053257073

ABSTRACT:
An air filter condition indicator which provides an indication of the degree of clogging of the air filter. The indicator has a housing which supports a cylinder. A balance assembly has a hub member supported by the housing, and a balance lever having a piston rod and piston at one end and a counter weight at the other end. An actuation weight arm extends downwardly from the balance lever and has a movable weight which adjusts the sensitivity of the device. An indicator member held by the hub member on the balance assembly as a fan pulls air through the air filter, one side of the piston is connected to the fan side of the air filter and the other side of the piston is open to ambient air. The amount of movement of the piston is shown by the indicator member.

REFERENCES:
patent: 2921157 (1966-01-01), Stein
patent: 3934543 (1976-01-01), Howard
patent: 3950998 (1976-04-01), Murphy, Jr. et al.
patent: 4669317 (1987-06-01), Delajoud
patent: 4970899 (1990-11-01), Huang

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