Dirt accumulation indicator for air intake filters
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United States of America Patent
Stats
-
Aug 25, 1987
Grant Date -
N/A
app pub date -
Aug 1, 1985
filing date -
Aug 1, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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