# US 5,349,866 A · Digital pressure gauge

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- Number: US 5,349,866 A
- Document ID: US5349866A
- Status: Granted
- Kind: A
- Application number: 07/882,540
- Filed: 1992-05-13
- Granted: 1994-09-27
- Earliest claimed: 1992-05-13
- Inventors: Tien-Tsai Huang
- Web page: https://patentgrep.com/patent/US5349866A

## CPC

- G01L 19/083: {electrical}
- G01L 9/0027: {using variations in ohmic resistance}
- G01L 9/0051: {using variations in ohmic resistance}
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

A digital pressure gauge includes a casing having a pressure sensitive member which responds when pressure is passed therethrough and a digital display member electrically connected to the pressure sensing member. The gauge includes an insulating rod which engages the pressure sensitive member and which contacts a weight sensing member in response to pressure flowing through an inlet so as to expand the pressure sensitive member.

## Claims

### Claim 1

A digital pressure gauge, comprising:
a casing having a weight sensing member provided therein and a display member electrically connected to said weight sensing member, said display member displaying a weight sensed by said sensing member in digital numbers; and
an expandable air pressure sensitive mechanism provided in said casing and having an inlet in communication with the air pressure mechanism;
an insulating rod for engaging said air pressure sensitive mechanism and which directly contacts said weight sensing member at a point on a surface of the weight sensing member closest to said pressure sensitive mechanism in response to pressure flowing through the inlet so as to expand the pressure sensitive mechanism.

### Claim 2 (depends on 1)

A digital pressure gauge as claimed in claim 1, wherein said air pressure sensitive mechanism comprises a diaphragm.

### Claim 3 (depends on 1)

A digital pressure gauge as claimed in claim 1, wherein said weight sensing member comprises a thick-film resistor.

### Claim 4 (depends on 1)

A digital pressure gauge as claimed in claim 1, wherein said display member comprises a liquid crystal display.