The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 25, 1987
Filed:
Aug. 01, 1985
Paul Gerlach, Ludwigsburg, DE;
Heinz E Muller, Weissach, DE;
Filterwerk Mann & Hummel GmbH, Ludwigsburg, DE;
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.