US4064456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meter box assembly
Assignee: United States Department of the Air Force
•
Filing: 1976-04-09
•
Granted: 1977-12-20
•
Expires: 1996-04-09
Abstract
Abstract A meter box assembly capable of displaying signal magnitudes. The meter box assembly is in the form of a housing which encloses therein a plurality of circuits, each of the circuits being connected to a display unit on the housing. Each meter box assembly circuit combines in a novel arrangement a meter, switch module, voltmeter circuit and strain gage circuit in order to display in an accurate fashion voltages external to the meter box assembly or to display the voltage output of a strain gage transducer.
Inventors
- 👤 Clark Richard Grove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:13
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/08; G01R29/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
195 words
A meter box assembly capable of displaying the remote voltage from an external voltage source or the voltage output from an external strain gage transducer, said meter box assembly comprising a housing, said housing having at least one display unit therein, said display unit being in the form of means for displaying said remote voltage or said voltage output from said strain gage transducer, a switching means electrically connected to said display means, a voltmeter circuit, said voltmeter circuit being electrically connected between said external voltage source and said switching means, a strain gage circuit, said strain gage circuit being independent of said voltmeter circuit and electrically connected between said external strain gage transducer and said switching means, said strain gage circuit having a strain gage conditioning module, a switch module, a calibration resistor and an indicator lamp circuit, said external strain gage transducer being electrically connected between said conditioning module, said calibration resistor, said switch module and said indicator lamp circuit, whereby in accordance with the position of said switching means, said display means registers either said remote voltage from said external voltage source or said voltage output from said external strain gage transducer.
Claim 2
Dependent Claim
195 words
A meter box assembly capable of displaying the remote voltage from an external voltage source or the voltage output from an external strain gage transducer, said meter box assembly comprising a housing, said housing having at least one display unit therein, said display unit being in the form of means for displaying said remote voltage or said voltage output from said strain gage transducer, a switching means electrically connected to said display means, a voltmeter circuit, said voltmeter circuit being electrically connected between said external voltage source and said switching means, a strain gage circuit, said strain gage circuit being independent of said voltmeter circuit and electrically connected between said external strain gage transducer and said switching means, said strain gage circuit having a strain gage conditioning module, a switch module, a calibration resistor and an indicator lamp circuit, said external strain gage transducer being electrically connected between said conditioning module, said calibration resistor, said switch module and said indicator lamp circuit, whereby in accordance with the position of said switching means, said display means registers either said remote voltage from said external voltage source or said voltage output from said external strain gage transducer.
Claim 3
Dependent Claim
40 words
A meter box assembly as defined in claim 1 wherein said voltmeter circuit comprises a range switch and a plurality of range resistors, said range switch being electrically connected between said external voltage source and said plurality of range resistors.
Claim 4
Dependent Claim
51 words
A meter box assembly as defined in claim 2 wherein said voltmeter circuit further comprises a variable range resistor and means for direct access to said display means, said range switch being capable of electrical connection to said variable range resistor or said means for direct access to said display means.
Claim 5
Dependent Claim
22 words
A meter box assembly as defined in claim 1 wherein said strain gage conditioning module comprises a power source and an amplifier.
Claim 6
Dependent Claim
26 words
A meter box assembly as defined in claim 4 wherein said calibration resistor is electrically connected between one leg of said transducer and said switch module.
Claim 7
Dependent Claim
22 words
A meter box assembly as defined in claim 3 wherein said strain gage conditioning module comprises a power source and an amplifier.
Claim 8
Dependent Claim
26 words
A meter box assembly as defined in claim 6 wherein said calibration resistor is electrically connected between one leg of said transducer and said switch module.
References Cited (Backward Citations)
US3390329A
Cited
US3535637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |