Patent US3603083A successfully refreshed from Google Patents.
US3603083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic actuator
Assignee: IMO Industries Inc
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Filing: 1970-02-16
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Granted: 1971-09-07
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Expires: 1990-02-16
Abstract
Abstract A servomechanism for use in controlling steam valves of turbines comprises a remote electrical servo arranged to drive a local hydraulic servo, which actuates the valves. Provision is made for manual actuation of the valves, with an interlock which prevents the hydraulic servo from being reactuated when the error signal is off zero by a predetermined amount. The interlock automatically bypasses driving oil at the ports of the hydraulic servomotor when manual control is effected.
Inventors
- 👤 Richard Carl Coursen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:41
CPC Classifications
F; F01; F01D; F01D17/00; F01D17/20; F01D17/22; F15; F15B; F15B9/00; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
120 words
A servomechanism for imparting motion to an element comprising a reversible motor having mechanical output means adapted to impart motion to said element, a source of power for operating said motor, means producing a feedback signal varying with the position of said mechanical output means, means comprising said feedback signal with a command signal and producing an error signal when said feedback signal differs from said command signal, means responsive to said error signal for delivering power from said source to operate said motor in a direction to reduce said error signal, and means responsive to said error signal for preventing the delivery of power to operate said motor when the magnitude of said error signal exceeds a predetermined limit.
Claim 2
Dependent Claim
120 words
A servomechanism for imparting motion to an element comprising a reversible motor having mechanical output means adapted to impart motion to said element, a source of power for operating said motor, means producing a feedback signal varying with the position of said mechanical output means, means comprising said feedback signal with a command signal and producing an error signal when said feedback signal differs from said command signal, means responsive to said error signal for delivering power from said source to operate said motor in a direction to reduce said error signal, and means responsive to said error signal for preventing the delivery of power to operate said motor when the magnitude of said error signal exceeds a predetermined limit.
Claim 3
Dependent Claim
58 words
A servomechanism according to claim 1 including additional means adapted to impart motion to said element, a clutch connecting said additional means to said mechanical output means, means for engaging and disengaging said clutch, and means responsive to the condition of said clutch for preventing the delivery of power to operate said motor when said clutch is engaged.
Claim 4
Dependent Claim
127 words
A servomechanism according to claim 1 in which said reversible motor is a hydraulic motor, said source of power is a Pump, and said means responsive to said error signal is a relay valve connected to deliver driving liquid from said pump through said hydraulic motor in a first direction when said command signal exceeds said error signal and in a second direction when said error signal exceeds said command signal and including an electric motor connected to drive said pump wherein said means responsive to said error signal for preventing the delivery of power to operate said motor comprises at least one switch connected to deliver electric power to said electric motor and means for opening said switch when said error signal exceeds said predetermined limit.
Claim 5
Dependent Claim
167 words
A servomechanism according to claim 1 in which said reversible motor is a hydraulic motor, said source of power is a pump, and said means responsive to said error signal is a relay valve connected to deliver driving liquid from said pump through said hydraulic motor in a first direction when said command signal exceeds said error signal and in a second direction when said error signal exceeds said command signal and including an electric motor connected to drive said pump, additional means adapted to impart motion to said element, a clutch connecting said additional means to said mechanical output means, means for engaging and disengaging said clutch, and means responsive to the condition of said clutch for preventing the delivery of power to operate said motor when said clutch is engaged wherein said means responsive to the condition of said clutch comprises at least one switch connected to deliver electric power to said electric motor and means for opening said switch when said clutch is engaged.
Claim 6
Dependent Claim
213 words
A servomechanism according to claim 1 in which said reversible motor is a hydraulic motor, said source of power is a pump, and said means responsive to said error signal is a relay valve connected to deliver driving liquid from said pump through said hydraulic motor in a first direction when said command signal exceeds said error signal and in a second direction when said error signal exceeds said command signal and including an electric motor connected to drive said pump, additional means adapted to impart motion to said element, a clutch connecting said additional means to said mechanical output means, means for engaging and disengaging said clutch, and means responsive to the condition of said clutch for preventing the delivery of power to operate said motor when said clutch is engaged wherein said means responsive to the condition of said clutch comprises at least one switch connected to deliver electric power to said electric motor and means for opening said switch when said clutch is engaged, and wherein said means responsive to said error signal for preventing the delivery of power to operate said motor comprises at least one additional switch connected in series with said switch and means for opening said additional switch when said error signal exceeds said predetermined limit.
Claim 7
Dependent Claim
109 words
A servomechanism according to claim 1 in which said reversible motor is a hydraulic motor, said source of power is a pump, and said means responsive to said error signal is a relay valve connected to deliver driving liquid from said pump through said hydraulic motor in a first direction when said command signal exceeds said error signal and in a second direction when said error signal exceeds said command signal and including an electric motor connected to drive said pump and means responsive to the condition of said relay valve for reducing the flow of liquid from the outlet of said pump when said error signal is zero.
Claim 8
Dependent Claim
110 words
A servomechanism comprising a reversible motor having an output shaft, an input shaft, a lever, means positioning a first point on said lever in accordance with the position of said output shaft, means positioning a second point on said lever in accordance with the position of said input shaft, means positioned by a third point on said lever for controlling said reversible motor to operate in a direction to maintain said third pOint in a first predetermined range of positions, and means positioned by said third point on said lever for preventing operation of said motor when said third point is moved out of a second predetermined range of positions.
Claim 9
Dependent Claim
110 words
A servomechanism comprising a reversible motor having an output shaft, an input shaft, a lever, means positioning a first point on said lever in accordance with the position of said output shaft, means positioning a second point on said lever in accordance with the position of said input shaft, means positioned by a third point on said lever for controlling said reversible motor to operate in a direction to maintain said third pOint in a first predetermined range of positions, and means positioned by said third point on said lever for preventing operation of said motor when said third point is moved out of a second predetermined range of positions.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |