US3720118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrated servo actuator
Assignee: Delta Hydraulics Inc
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Filing: 1971-03-17
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Granted: 1973-03-13
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Expires: 1991-03-17
Abstract
Abstract An integrated servo actuator including in a single package a force motor, a fluid modulator controlled directly by the force motor, and an actuator movable in response to the characteristic flow of fluid through the modulator. An integral potentiometer mounted in the housing produces a signal which is a function of the actuator position.
Inventors
- 👤 Cormic J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:38
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/03
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
169 words
An integrated servo actuator comprising a housing having means defining an elongated passage, a force motor assembly disposed toward one end of the housing, a fluid modulator mounted in the passage of the housing, means for directing a fluid under pressure through the modulator, a control member forming part of the force motor assembly for controlling the modulator, an actuator mounted in the passage of the housing, aligned in the same direction with the modulator, and changing position in response to changes in the flow through the modulator, said modulator having a suRface in facing relationship to said actuator, said actuator having means defining an elongated cavity, and an elongated potentiometer disposed at least in part within said elongated cavity secured to and extending from the surface of said modulator and operatively coupled to said actuator for producing a signal which is a function of the position of said actuator said modulator including at least one passage adjacent said housing for applying pressure to one side of said actuator.
Claim 2
Dependent Claim
169 words
An integrated servo actuator comprising a housing having means defining an elongated passage, a force motor assembly disposed toward one end of the housing, a fluid modulator mounted in the passage of the housing, means for directing a fluid under pressure through the modulator, a control member forming part of the force motor assembly for controlling the modulator, an actuator mounted in the passage of the housing, aligned in the same direction with the modulator, and changing position in response to changes in the flow through the modulator, said modulator having a suRface in facing relationship to said actuator, said actuator having means defining an elongated cavity, and an elongated potentiometer disposed at least in part within said elongated cavity secured to and extending from the surface of said modulator and operatively coupled to said actuator for producing a signal which is a function of the position of said actuator said modulator including at least one passage adjacent said housing for applying pressure to one side of said actuator.
Claim 3
Dependent Claim
169 words
An integrated servo actuator comprising a housing having means defining an elongated passage, a force motor assembly disposed toward one end of the housing, a fluid modulator mounted in the passage of the housing, means for directing a fluid under pressure through the modulator, a control member forming part of the force motor assembly for controlling the modulator, an actuator mounted in the passage of the housing, aligned in the same direction with the modulator, and changing position in response to changes in the flow through the modulator, said modulator having a suRface in facing relationship to said actuator, said actuator having means defining an elongated cavity, and an elongated potentiometer disposed at least in part within said elongated cavity secured to and extending from the surface of said modulator and operatively coupled to said actuator for producing a signal which is a function of the position of said actuator said modulator including at least one passage adjacent said housing for applying pressure to one side of said actuator.
Claim 4
Dependent Claim
169 words
An integrated servo actuator comprising a housing having means defining an elongated passage, a force motor assembly disposed toward one end of the housing, a fluid modulator mounted in the passage of the housing, means for directing a fluid under pressure through the modulator, a control member forming part of the force motor assembly for controlling the modulator, an actuator mounted in the passage of the housing, aligned in the same direction with the modulator, and changing position in response to changes in the flow through the modulator, said modulator having a suRface in facing relationship to said actuator, said actuator having means defining an elongated cavity, and an elongated potentiometer disposed at least in part within said elongated cavity secured to and extending from the surface of said modulator and operatively coupled to said actuator for producing a signal which is a function of the position of said actuator said modulator including at least one passage adjacent said housing for applying pressure to one side of said actuator.
Claim 5
Dependent Claim
38 words
An integrated servo actuator as described in claim 1 further characterized by an orifice forming part of the modulator, and said control member forming part of the force motor and moving to change the size of the orifice.
Claim 6
Dependent Claim
47 words
An integrated servo actuator as described in claim 1 further characterized by said modulator and control member together defining a variable orifice, and a pressure chamber in the modulator in communication with the actuator for controlling the actuator position, said orifice controlling the pressure in the chamber.
Claim 7
Dependent Claim
102 words
An integrated servo actuator as described in claim 1 further characterized by said modulator having an inlet for a fluid pressure source and an orifice through which the fluid discharges, a chamber in the modulator through which the fluid flows, upstream of the orifice, said control member varying the size of the orifice to vary the pressure in the chamber, said actuator including a piston slidable in the housing, said modular passage adjacent said housing connected to the chamber for applying the chamber pressure adjacent one side of the piston, and a biasing force exerted against the opposite side of the piston.
Claim 8
Dependent Claim
28 words
An integrated servo actuator as described in claim 1 further characterized by said potentiometer comprising a metal bar, and a circuit including brushes in contact with the bar.
Claim 9
Dependent Claim
36 words
An integrated servo actuator as described in claim 4 further characterized by said force motor including a movable coil member and fixed pole pieces, said coil member carrying the control member to vary the orifice size.
Claim 10
Dependent Claim
28 words
An integrated servo actuator as described in claim 1 further characterized by said modulator including means defining a passage for accommodating a pair of wires of said potentiometer.
Claim 11
Dependent Claim
25 words
An integrated servo actuator as described in claim 7 further characterized by said elongated cavity being cylindrical in shape and located centrally of said actuator.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |