Henry M Hermanns

US Patent:

41129601, Sep 12, 1978

Filed:

Mar 21, 1977

Appl. No.:

5/779511

Inventors:

Henry M. Hermanns - Huntingdon Valley PA

Assignee:

Fischer & Porter Company - Warminster PA

International Classification:

G05B 1144

US Classification:

137 85

Abstract:

A range spring sub-assembly providing a variable gradient with minimum hysteresis for the feedback assembly of a pneumatic transmitter. The sub-assembly is constituted by a helical spring whose lower end is secured to the pivoted feedback arm of the feedback assembly and whose upper end is coupled by a span adjustment screw to a fixed arm thereof. The arm porton of the screw extending above the fixed arm is engaged by a zero adjustment knob which rests on top of the fixed arm, whereby when the knob is turned, the screw is axially shifted to vary the tension of the spring coupled thereto. The span adjustment screw has a coupling terminal head that is received within the upper end of the spring and is provided with a set of outwardly projecting pins. The pins are at different heights and are interposed between adjacent convolutions of the spring whereby the pinned convolutions are rendered inactive and the convolutions therebelow remain active. By rotating the screw, the number of active convolutions is varied, thereby varying the gradient of the spring.

US Patent:

43122400, Jan 26, 1982

Filed:

Jun 2, 1980

Appl. No.:

6/155169

Inventors:

Henry M. Hermanns - Rydal PA

Assignee:

Fischer & Porter Company - Warminster PA

International Classification:

G01F 122

US Classification:

7386157

Abstract:

A flowmeter of the variable area type capable of measuring corrosive liquids and gases and including a metal metering tube having a corrosion-resistant PTFE liner. To match the corrosion-resistance properties of the lined metering tube, the float assembly operating within the tube is mainly of FEP construction, the float head of the assembly which engages the inner wall of the metering tube being constructed of tantalum.