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:
Feb. 22, 1983
Filed:
Feb. 09, 1981
John Hestich, Glendora, CA (US);
Dwyer Instruments, Inc., Michigan City, IN (US);
Abstract
A differential pressure gauge of the type comprising a controlling magnetic helix device carrying a pressure indicating pointer, the position of which is controlled by a magnet magnetically coupled to same and mounted on the free end of a helically coiled bourdon tube exposed to differential pressures within the gauge and anchored in the gauge housing at its other end for this purpose. The magnet has a planar pole face paralleling the axis of the helix and defines a magnetic axis that is normal to and intersects the helix axis. The gauge housing defines an integral one piece pressure wall that separates and physically seals the helix from the magnet and bourdon tube and defines within the gauge housing pressure cavity an operating space within which the magnet and its supporting bourdon tube are mounted and operate. Between the helix and the magnet the pressure wall is of film dimensions to allow close placement of the magnet and helix relative to each other, and for defining a magnetic flux passing 'window'; the pressure wall is contoured to stress in bending. The bourdon tube is mounted on a mounting plate or crossmember disposed within the pressure cavity, and the mounting plate is arranged for calibrating the gauge by adjustment of the mounting plate, the bourdon tube it carries, and the magnet, as a unit, toward and away from the helix. The gauge includes a zero datum and a device for setting the indicating pointer on the zero datum from exteriorly of the gauge, including an adjustment mechanism coupled to the helix and seated on the housing in alignment with the helix axis.