US3565194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Digital weighing system
Assignee: RACAL-DANA INSTRUMENTS Inc
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Filing: 1969-04-14
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Granted: 1971-02-23
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Expires: 1989-04-14
Abstract
Abstract A system is disclosed for providing digital indications of the gross or net weights of a load (or accumulated loads), as sensed by electrical load cells. The load cells are energized from a source of reference potential to provide an output signal that is converted to a digital form by a ratioed ramp voltmeter operating in cooperation with a digital counter. The ramp voltmeter is driven by reference potential to provide improved accuracy. An active multipole filter is provided for filtering the signal from the load cell structure to eliminate spurious components thereof created by vibration and the like. The system also incorporates, analogue and digital scaling, flexibility in the use of tare, and a test conversion facility.
Inventors
- 👤 Charles E Engle
- 👤 Robert E Reinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:38
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/18; G01G23/36; G01G23/37; G01G3/00; G01G3/12; G01G3/14; G01G3/142; G01G3/147; H; H03; H03M; H03M1/00; H03M1/12; H03M1/50; H03M1/56
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
103 words
A system for weighing an applied load, comprising: a platform for receiving said load; a source of reference potential; force transducer means for supporting said platform, said force transducer means having varying electrical characteristics in accordance with the load supported thereby; means for energizing said force transducer means with said reference potential, whereby to develop an electrical load signal; a ramp generator energized by said source of reference potential; a digital counter for counting on a time base; and means for comparing said electrical load signal with the output of said ramp generator whereby to establish an operating level for said digital counter.
Claim 2
Independent Claim
103 words
A system for weighing an applied load, comprising: a platform for receiving said load; a source of reference potential; force transducer means for supporting said platform, said force transducer means having varying electrical characteristics in accordance with the load supported thereby; means for energizing said force transducer means with said reference potential, whereby to develop an electrical load signal; a ramp generator energized by said source of reference potential; a digital counter for counting on a time base; and means for comparing said electrical load signal with the output of said ramp generator whereby to establish an operating level for said digital counter.
Claim 3
Dependent Claim
45 words
A system according to claim 1 further including: means for providing digital signals representative of a tare weight portion of said load; and means for arithmetically combining signals indicative of the content of said digital counter and said digital signals representative of a tare weight.
Claim 4
Dependent Claim
32 words
A system according to claim 2 wherein said means for combining includes an arithmetic unit connected to receive said digital signals representative of a tare weight and also connected to said counter.
Claim 5
Dependent Claim
29 words
A system according to claim 3 further including means for applying a portion of said reference potential to said digital means whereby to test the operation of said system.
Claim 6
Dependent Claim
26 words
A system according to claim 4 further including multipole active filter means for filtering said electrical load signal prior to application thereof to said digital means.
Claim 7
Dependent Claim
29 words
A system according to claim 1, further including means for applying a portion of said reference potential to said digital means whereby to test the calibration of said system.
Claim 8
Dependent Claim
21 words
A system according to claim 1 further including means to accumulate said signals indicative of the content of said digital counter.
Claim 9
Independent Claim
16 words
A system according to claim l including means to scale the operation of said digital counter.
Claim 10
Dependent Claim
45 words
A system according to claim 8, further including means to accumulate said signals indicative of the content of said digital counter and further including means for applying a portion of said reference potential to said digital means whereby to test the operation of said system.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |