Abstract In accordance with the present invention, a pressure indicator is mounted upon a railway car and is in communication with an opening into the pressure chamber of the car. The car may be, for example, a pressurized hopper car or a pressurized tank car. The indicator comprises a fixed assembly having a resilient member so engaging said fixed assembly that the resilient member may react against the fixed assembly. A movable assembly is provided, at least a portion of which is used to indicate the pressure in the chamber. A flexible diaphragm is provided in the indicator, preferably a rolling diaphragm, which is affixed to the fixed assembly and the movable assembly and enables the pressure applied to the indicator to be applied to the movable assembly against the bias of the resilient member and permit at least a portion of the movable assembly to indicate the pressure range in the tank. Preferably the indicating portion is color coded.
Inventors
👤 Ervin I. Pietsch
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-05 16:01
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/02; G01L7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
171 words
A pressure indicator for a railway car comprising: a fixed assembly having an opening therein in communication with a portion of a railway car adapted to be pressurized; said fixed assembly comprising a fixed cylinder having a plurality of inwardly extending ribs holding a disk in place, which disk cooperates with a movable assembly to hold within said fixed cylinder and within a portion of said movable assembly a resilient means; a movable assembly comprising a movable cylinder mounted within said fixed assembly and externally of said resilient means, having a plurality of circumferentially spaced slots aligned with said ribs, said movable assembly comprising a viewable portion viewable from the side of the car; a flexible diaphragm held in place by said fixed assembly and engaging said movable assembly and adapted to move in response to pressure changes in said railway car whereby an increase in pressure will move said movable assembly against the bias of said resilient means relative to said fixed assembly and indicate pressure change in said car.
Claim 2
Dependent Claim
171 words
A pressure indicator for a railway car comprising: a fixed assembly having an opening therein in communication with a portion of a railway car adapted to be pressurized; said fixed assembly comprising a fixed cylinder having a plurality of inwardly extending ribs holding a disk in place, which disk cooperates with a movable assembly to hold within said fixed cylinder and within a portion of said movable assembly a resilient means; a movable assembly comprising a movable cylinder mounted within said fixed assembly and externally of said resilient means, having a plurality of circumferentially spaced slots aligned with said ribs, said movable assembly comprising a viewable portion viewable from the side of the car; a flexible diaphragm held in place by said fixed assembly and engaging said movable assembly and adapted to move in response to pressure changes in said railway car whereby an increase in pressure will move said movable assembly against the bias of said resilient means relative to said fixed assembly and indicate pressure change in said car.
Claim 3
Dependent Claim
28 words
A pressure indicator according to claim 1 wherein said fixed assembly comprises a transparent viewing portion into which said movable viewable portion moves during an increase in pressure.
Claim 4
Dependent Claim
15 words
A pressure indicator according to claim 1 wherein said resilient means comprises a coil spring.
Claim 5
Dependent Claim
20 words
A pressure indicator according to claim 1 wherein at least a portion of said movable viewable portion is color coded.