Patent US1951116A successfully refreshed from Google Patents.
US3772889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo pump having throttled input
Assignee: Textron Inc
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Filing: 1971-06-16
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Granted: 1973-11-20
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Expires: 1991-06-16
Abstract
Abstract A fluid flow control system for moving a load positioning member which system utilizes a closed hydraulic system of predetermined capacity including a reservoir. A continuously running fixed displacement pump means having inlet and outlet ports is connected to receive fluid from the reservoir and to transmit the fluid to the load positioning means. Control valve means is disposed to control the amount of fluid flow to the pump means and to direct the flow from the pump means to the load positioning member. Control means is connected to the control valve means to position the control valve means responsive to received signals to properly position the valve means respective to the inlet and outlet ports of the pump means thereby to effect the desired rate of flow. There may be also included make-up valve means between the reservoir and the intake port of the pump means, relief valve means between the output port of the pump means and the reservoir, as well as shut-off valve means responsive to discrepancy in compared signals within the control means of the system for eliminating control of the load positioning member by a particular pump means and control valve means associated therewith.
Inventors
- 👤 R Mason
- 👤 J Roark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:21
CPC Classifications
F; F04; F04B; F04B1/00; F04B1/12; F04B1/14; F04B1/18; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B9/09; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
A syttem for supplying fluid under pressure to an actuator comprising: pump means having an inlet and an outlet; an actuator; a reservoir of said fluid; control valve means connected between said pump means and said actuator and normally blocking fluid flow between said reservoir and said pump inlet and between said actuator and said pump outlet; signal responsive means connected to move said control valve means to provide direct fluid communication between said pump inlet and outlet and said actuator, said pump means transferring fluid from one part of said actuator to a different part thereof thereby to position said actuator; a conduit means interconnecting said reservoir and said pump means inlet; make-up valve means connected in said conduit means for maintaining said conduit means normally closed; and pressure sensitive means connected to said actuator and to said make-up valve means to actuate said-make-up valve means and interconnect said reservoir to said pump inlet when the pressure at said actuator is at a predetermined level.
Claim 2
Dependent Claim
166 words
A syttem for supplying fluid under pressure to an actuator comprising: pump means having an inlet and an outlet; an actuator; a reservoir of said fluid; control valve means connected between said pump means and said actuator and normally blocking fluid flow between said reservoir and said pump inlet and between said actuator and said pump outlet; signal responsive means connected to move said control valve means to provide direct fluid communication between said pump inlet and outlet and said actuator, said pump means transferring fluid from one part of said actuator to a different part thereof thereby to position said actuator; a conduit means interconnecting said reservoir and said pump means inlet; make-up valve means connected in said conduit means for maintaining said conduit means normally closed; and pressure sensitive means connected to said actuator and to said make-up valve means to actuate said-make-up valve means and interconnect said reservoir to said pump inlet when the pressure at said actuator is at a predetermined level.
Claim 3
Dependent Claim
127 words
A throttling pump load positioning apparatus comprising: a continuously running fixed displacement fluid pump means having inlet and outlet ports; a reservoir of fluid; conduit means connecting said inlet ports to said reservoir; flow control valve means in said conduit means connected to control the flow of fluid from said reservoir to said inlet parts, said flow control valve means normally blocking flow between said reservoir and said inlet ports; means for controlling said flow control valve means to permit fluid flow between said reservoir and said inlet ports; & load positioning means connected to said outlet ports; and feedback means responsive to fluid flow and/or pressure demands of said load positioning means connected between said load positioning means and said means for controlling said valve means.
Claim 4
Dependent Claim
127 words
A throttling pump load positioning apparatus comprising: a continuously running fixed displacement fluid pump means having inlet and outlet ports; a reservoir of fluid; conduit means connecting said inlet ports to said reservoir; flow control valve means in said conduit means connected to control the flow of fluid from said reservoir to said inlet parts, said flow control valve means normally blocking flow between said reservoir and said inlet ports; means for controlling said flow control valve means to permit fluid flow between said reservoir and said inlet ports; & load positioning means connected to said outlet ports; and feedback means responsive to fluid flow and/or pressure demands of said load positioning means connected between said load positioning means and said means for controlling said valve means.
Claim 5
Dependent Claim
111 words
A throttling pump load positioning apparatus comprising: a continuously running fixed displacement fluid pump means having inlet and outlet ports; a reservoir of fluid; inlet conduit means connecting said inlet ports to saiD reservoir; load positioning means connected to said outlet ports; flow control spool valve means in said inlet conduit means connected to control the flow of fluid from said reservoir to said inlet ports, said spool valve having lands thereon normally blocking said pump inlet and outlet ports from communication with said reservoir and said load positioning means respectively and; means for controlling said flow control valve means to permit fluid flow between said reservoir and said inlet ports.
Claim 6
Dependent Claim
111 words
A throttling pump load positioning apparatus comprising: a continuously running fixed displacement fluid pump means having inlet and outlet ports; a reservoir of fluid; inlet conduit means connecting said inlet ports to saiD reservoir; load positioning means connected to said outlet ports; flow control spool valve means in said inlet conduit means connected to control the flow of fluid from said reservoir to said inlet ports, said spool valve having lands thereon normally blocking said pump inlet and outlet ports from communication with said reservoir and said load positioning means respectively and; means for controlling said flow control valve means to permit fluid flow between said reservoir and said inlet ports.
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |