US3897174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for feeding fluid under pressure to at least two load circuits
Assignee: Poclain SA
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Filing: 1974-04-29
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Granted: 1975-07-29
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Expires: 1994-04-29
Abstract
Abstract In a device for feeding fluid under pressure to at least two load circuits, of which one has priority, the power required to drive a group of constant flow pumps connected to the priority load circuit is subtracted from the power of the motor driving this group of pumps and a second group of variable flow pumps connected to the non-priority load, the difference in the powers being used for the second group of variable flow pumps, the subtraction being effected by a valve coupled in a pipe connecting the delivery pipe from the constant flow group of pumps and an inlet chamber of a regulator of the group of variable flow pumps, the valve providing a variable fluid constriction which is varied in dependence on the pressure in the delivery pipe of the group of variable flow pumps.
Inventors
- 👤 Michel F Capelle
- 👤 Claude Pinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:10
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/16; F15B11/17; F04; F04B; F04B49/00; F04B49/007; F04B49/08; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20576; F15B2211/26; F15B2211/70; F15B2211/71; F15B2211/7142
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
347 words
A device for feeding fluid under pressure to at least two load circuits, comprising: two groups of pump means for feeding fluid to a respective one of said load circuits and each including a pump, a driving shaft and a delivery pipe, one of said groups of pump means being constant-flow and the other of said groups being variable-flow, flow control means associated with said variable-flow group, driving motor means having a single output shaft to which are coupled the driving shafts of said pumps, power regulatoR means including a body and an element movable with respect to the body and which is coupled between the flow control means and the body of said variable-flow group of pump means, said regulator including ram means interposed between said body and said movable element of said regulator and comprising an inlet chamber, pipe means connecting the delivery pipe from said constant-flow group of pump means to said inlet chamber, and a valve arranged in said connecting pipe means and comprising a body, a slide movably mounted in said body, an inlet connected to said delivery pipe by said connecting pipe means, two outlets of which a first outlet is connected to a fluid tank and the second outlet is connected to said inlet chamber of said ram means by said connecting pipe means, a fluid connection for control of the position of said slide, said fluid connection being connected to the delivery pipe of said variable-flow group of pump means, and a passage between said body and said slide of said valve at least one of the dimensions of which varies as a function of the position of the said slide in said body, said inlet, said first outlet and said second outlet being in permanent communications with said passage, said second outlet communicating with said passsge at a region intermediate communication of said inlet and said first outlet with said passage, and the portion of said passage lying between the regions of communication of said inlet and said second outlet with said passage forming a variable fluid constriction.
Claim 2
Independent Claim
347 words
A device for feeding fluid under pressure to at least two load circuits, comprising: two groups of pump means for feeding fluid to a respective one of said load circuits and each including a pump, a driving shaft and a delivery pipe, one of said groups of pump means being constant-flow and the other of said groups being variable-flow, flow control means associated with said variable-flow group, driving motor means having a single output shaft to which are coupled the driving shafts of said pumps, power regulatoR means including a body and an element movable with respect to the body and which is coupled between the flow control means and the body of said variable-flow group of pump means, said regulator including ram means interposed between said body and said movable element of said regulator and comprising an inlet chamber, pipe means connecting the delivery pipe from said constant-flow group of pump means to said inlet chamber, and a valve arranged in said connecting pipe means and comprising a body, a slide movably mounted in said body, an inlet connected to said delivery pipe by said connecting pipe means, two outlets of which a first outlet is connected to a fluid tank and the second outlet is connected to said inlet chamber of said ram means by said connecting pipe means, a fluid connection for control of the position of said slide, said fluid connection being connected to the delivery pipe of said variable-flow group of pump means, and a passage between said body and said slide of said valve at least one of the dimensions of which varies as a function of the position of the said slide in said body, said inlet, said first outlet and said second outlet being in permanent communications with said passage, said second outlet communicating with said passsge at a region intermediate communication of said inlet and said first outlet with said passage, and the portion of said passage lying between the regions of communication of said inlet and said second outlet with said passage forming a variable fluid constriction.
Claim 3
Dependent Claim
52 words
A feeding device as claimed in claim 1, including a calibrated valve arranged in said connecting pipe means between said valve and the connection of said connecting pipe means to said delivery pipe of said constant-flow group of pump means, to be piloted by the pressure of fluid in said delivery pipe.
Claim 4
Dependent Claim
76 words
A feeding device as claimed in claim 1, wherein said slide is mounted to slide in said body of said valve and is bored to receive an elongate control fluid delivery member in sealing engagement therewith, said slide being movable relatively to said elongate member, and being subjected to the effect of the pressure of the control fluid and the opposing action of a return member coupled between the slide and said body of said valve.
Claim 5
Dependent Claim
92 words
A feeding device as claimed in claim 1, wherein said passage is defined by a groove in the outer face of said slide of said valve and a channel in said slide and connecting said groove with a recess in said body of said valve which is connected to said second outlet from said valve, said groove being permanently connected to said inlet and said first outlet, the value of said variable constriction being proportional to the distance separating the regions of communication of said first and second outlets with the passage.
Claim 6
Dependent Claim
74 words
A feeding device as claimed in claim 1, wherein the power regulator includes second ram means interposed between its body and movable element and comprises an inlet chamber connected to said delivery pipe of said variable-flow group of pumps, a return member being interposed between said body and said movable element of said regulator and having an effect opposed to that of fluid when contained in the inlet chamber of the first ram means.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |