Dirt accumulation indicator for air intake filters

Details Dirt accumulation indicator for air intake filters Dirt accumulation indicator for air intake filters

1985-08-01

1987-08-25

Yasich, Daniel M.

Signals and indicators

Indicators

Fluid flow

55274, 116271, B01D 4600, G01L 1912

Patent

active

046885110

ABSTRACT:
A device for the indication of dirt accumulation on an air intake filter by measuring the negative pressure in the clean air space of the filter, the device having a spring-biased diaphragm piston driving a pointer shaft by means of a bell crank with a gear segment, the pointer shaft carrying two diametrically oppositely arranged pointers with vertical and horizontal length portions moving in axial and radial portions of a pointer gap defined between the housing cover and an indicator dial carried by the cover. A ratchet mechanism serves to retain the pointer readout by blocking return movements of the indicator mechanism, the ratchet mechanism being releasable by means of a reset button on the cover of the device. The device is calibrated by means of an adjustable bell crank spring.

REFERENCES:
patent: 148673 (1874-03-01), Crosby
patent: 376103 (1888-01-01), Mitchell
patent: 2605736 (1952-08-01), Cook et al.
patent: 2851002 (1958-09-01), Angst
patent: 3465707 (1969-09-01), Kashiwaba
patent: 3807350 (1974-04-01), Powell
patent: 4060050 (1977-11-01), Simonsson
patent: 4196633 (1980-04-01), Bissell

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