Fluid handling – Pressure modulating relays or followers – With counter-balancing pressure feedback to the modulating...
Patent
1977-03-21
1978-09-12
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
With counter-balancing pressure feedback to the modulating...
137 83, 267175, G05B 1144
Patent
active
041129601
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.
REFERENCES:
patent: 1023490 (1912-04-01), Beck
patent: 2265629 (1941-12-01), Christiansen
patent: 3155104 (1964-11-01), Hilgert
Cohan Alan
Ebert Michael
Fischer & Porter Company
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