Patent US3704404A successfully refreshed from Google Patents.
US3704404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regulating means
Assignee: Danfoss AS
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Filing: 1970-12-10
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Granted: 1972-11-28
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Expires: 1990-12-10
Abstract
Abstract The invention relates to a servomotor regulating unit having an adjustable proportional range. The servomotor is responsive to the output variable of the regulator which in turn is responsive to a sensed deviation voltage. An R-C unit in a an input circuit of the regulator has the charging voltage thereof switched on and off in synchronism with the switching on and off of the servometer. In known regulators the width of the proportional range and the amplification is adjusted by varying the charging voltage of the R-C unit with a potentiometer whereas in this invention they are adjusted independently of each other by limiting the voltage at the R-C unit to an adjustable value that is below the charging voltage and by making the charging timeconstant of the R-C unit independent of this limiting value.
Inventors
- 👤 Kristen Iversen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:35
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/14; G05B11/16; G05B11/36; G05B11/42
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
Control element regulating means having an adjustable proportional range, comprising, a proportional regulator having an input circuit and an output side, a control element having switch means and being responsive to current from said proportional regulator for on and off operation, a control circuit connected to said proportional regulator input circuit, said control circuit having switch means and including a parallel R-C unit, said control circuit having first adjustable means for adjusting the supply voltage for said R-C unit and second adjustable means for adjusting the time constant of said R-C unit, a switching device connected between said proportional regulator output side and said control element, said switching device being responsive to current from said proportional regulator to operate said control element and both of said switch means.
Claim 2
Dependent Claim
128 words
Control element regulating means having an adjustable proportional range, comprising, a proportional regulator having an input circuit and an output side, a control element having switch means and being responsive to current from said proportional regulator for on and off operation, a control circuit connected to said proportional regulator input circuit, said control circuit having switch means and including a parallel R-C unit, said control circuit having first adjustable means for adjusting the supply voltage for said R-C unit and second adjustable means for adjusting the time constant of said R-C unit, a switching device connected between said proportional regulator output side and said control element, said switching device being responsive to current from said proportional regulator to operate said control element and both of said switch means.
Claim 3
Dependent Claim
57 words
Control element regulating means according to claim 1 wherein said control circuit includes power supply terminals and a pair of resistors forming a voltage divider in series with one of said terminals, a resistor and a diode in parallel with one of said resistors, said control circuit switch means being between said resistor and said R-C unit.
Claim 4
Dependent Claim
34 words
Control element regulating means according to claim 2 wherein said means for adjusting the supply voltage for said R-C unit is an adjustable resistor connected between the top of said voltage divider and ground.
Claim 5
Dependent Claim
18 words
Control element regulating means according to claim 1 wherein the resistor part of said R-C unit is adjustable.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |