US3878679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated multi-function hydraulic system
Assignee: SPX Technologies Inc
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Filing: 1973-08-30
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Granted: 1975-04-22
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Expires: 1993-08-30
Abstract
Abstract A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function. Each of the valve means is connected to its own separate compensator valve means, the said compensator valve means being connected in series one with the other and being capable of delivering the necessary amount of hydraulic fluid to its respective control means in accordance with the full needs thereof and diverting the remainder of the fluid to the next following compensator valve means. The system also includes means connected to the compensator valve means farthest from said pump for sensing the total requirement of the system and for adjusting the output of the pump in response thereto. In preferred embodiments, the means for sensing and adjusting include a restricted orifice means, a valve means, and means for sensing the pressure across the orifice means, the valve means being connected through one of its ports to an adjustor means for adjusting the output of the pump, and being normally biased by the means for sensing the pressure drop so as to actuate said adjustor means in favor of providing a minimal continuous flow through said system regardless of the total requirements of the system.
Inventors
- 👤 Donald A Sievenpiper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:25
CPC Classifications
E; E02; E02F; E02F9/00; E02F9/20; E02F9/22; E02F9/2221; E02F9/2232; E02F9/2278; E02F9/2296; F; F04; F04B; F04B49/00; F04B49/08; F15; F15B; F15B11/00; F15B11/16; F15B11/161; F15B11/165; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/25; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/3053; F15B2211/30535; F15B2211/31; F15B2211/3105; F15B2211/3111; F15B2211/3144; F15B2211/315; F15B2211/3157; F15B2211/31576; F15B2211/355; F15B2211/40; F15B2211/405; F15B2211/40507; F15B2211/415; F15B2211/41563; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50536; F15B2211/55; F15B2211/60; F15B2211/605; F15B2211/6051; F15B2211/6054; F15B2211/70; F15B2211/71
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
152 words
A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function, at least two of said control valve means each being connected to its own upstream compensator valve means, said compensator valve means being connected in series one with the other and each being capable of deliverying the necessary amount of hydraulic fluid to its respective control valve means in accordance with the full needs thereof and diverting the remainder of said fluid to the next following compensator valve means, and means connected to said compensator valve means farthest from said pump for sensing the total requirement of the system despite the varying demands of said functions and for adjusting the output of the pump in response thereto.
Claim 2
Dependent Claim
152 words
A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function, at least two of said control valve means each being connected to its own upstream compensator valve means, said compensator valve means being connected in series one with the other and each being capable of deliverying the necessary amount of hydraulic fluid to its respective control valve means in accordance with the full needs thereof and diverting the remainder of said fluid to the next following compensator valve means, and means connected to said compensator valve means farthest from said pump for sensing the total requirement of the system despite the varying demands of said functions and for adjusting the output of the pump in response thereto.
Claim 3
Dependent Claim
152 words
A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function, at least two of said control valve means each being connected to its own upstream compensator valve means, said compensator valve means being connected in series one with the other and each being capable of deliverying the necessary amount of hydraulic fluid to its respective control valve means in accordance with the full needs thereof and diverting the remainder of said fluid to the next following compensator valve means, and means connected to said compensator valve means farthest from said pump for sensing the total requirement of the system despite the varying demands of said functions and for adjusting the output of the pump in response thereto.
Claim 4
Dependent Claim
152 words
A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function, at least two of said control valve means each being connected to its own upstream compensator valve means, said compensator valve means being connected in series one with the other and each being capable of deliverying the necessary amount of hydraulic fluid to its respective control valve means in accordance with the full needs thereof and diverting the remainder of said fluid to the next following compensator valve means, and means connected to said compensator valve means farthest from said pump for sensing the total requirement of the system despite the varying demands of said functions and for adjusting the output of the pump in response thereto.
Claim 5
Dependent Claim
36 words
A hydraulic system according to claim 1 in which the pressure of the system is determined by the highest load requirement of a function and adjustment is achieved by varying the flow rate of said pump.
Claim 6
Dependent Claim
232 words
A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function, each of said control valve means being connected to its own compensator valve means, said compensator valve means being connected in series one with the other and each beinG capable of delivering the necessary amount of hydraulic fluid to its respective control valve means in accordance with the full needs thereof and diverting the remainder of said fluid to the next following compensator valve means, and means connected to said compensator valve means farthest from said pump for sensing the total requirement of the system despite the varying demands of said functions and for adjusting the output of the pump in response thereto, said means for sensing and adjusting includes a restricted orifice means, a control valve, and means for sensing the pressure drop across said orifice means, said control valve being connected through a port to an adjustor means for adjusting the output of said pump, and being normally biased by said means for sensing said pressure drop so as to actuate said adjustor means in favor of providing a minimal continuous flow of fluid through the system regardless of the total requirement of the system.
Claim 7
Dependent Claim
232 words
A hydraulic system capable of adjusting the output of a variable delivery pump in response to the varying demands of any one of at least two hydraulically operated functions, the system comprising at least two control valve means each capable of performing a separate function, each of said control valve means being connected to its own compensator valve means, said compensator valve means being connected in series one with the other and each beinG capable of delivering the necessary amount of hydraulic fluid to its respective control valve means in accordance with the full needs thereof and diverting the remainder of said fluid to the next following compensator valve means, and means connected to said compensator valve means farthest from said pump for sensing the total requirement of the system despite the varying demands of said functions and for adjusting the output of the pump in response thereto, said means for sensing and adjusting includes a restricted orifice means, a control valve, and means for sensing the pressure drop across said orifice means, said control valve being connected through a port to an adjustor means for adjusting the output of said pump, and being normally biased by said means for sensing said pressure drop so as to actuate said adjustor means in favor of providing a minimal continuous flow of fluid through the system regardless of the total requirement of the system.
Claim 8
Dependent Claim
79 words
A hydraulic system according to claim 3 wherein said means for sensing the pressure drop across said orifice means includes two flow lines, one on either side of said orifice, and said control valve includes a control valve spool and a biasing spring, and wherein the flow line upstream of said orifice is connected to bias said spool against its biasing spring and said flow line downstream of said orifice is connected to bias said spool with said spring.
Claim 9
Dependent Claim
60 words
A hydraulic system according to claim 4 wherein said adjustor means includes a cylinder connected through said port to said control valve, a piston located in said cylinder and being biased against fluid flow from said port by a spring, and a lever arm means actuated by movement of said cylinder for increasing or decreasing the output of said pump.
Claim 10
Dependent Claim
24 words
A hydraulic system according to claim 5 wherein said control valve means include control valves each of which is connected to a separate shuttle.
Claim 11
Dependent Claim
70 words
A hydraulic system according to claim 6 wherein each control valve is connected to its compensator valve means and shuttle valve such that when said control valve is actuated to perform a function, said shuttle valve senses the fluid requirement to perform said function and activates said compensator valves means to fulfill said requirement in full and to divert excess fluid to said next compensator valve means in said series.
Claim 12
Dependent Claim
36 words
A hydraulic system according to claim 7 in which the pressure of the system is determined by the highest load requirement of a function, and adjustment is achieved by varying the flow rate of said pump.
Claim 13
Dependent Claim
92 words
A hydraulic system according to claim 8 wherein said means for sensing and adjusting includes a restricted orifice means, a control valve, and means for sensing the pressure drop across said orifice means, said control valve being connected through a port to an adjustor means for adjusting the output of said pump, and being normally biased by said means for sensing said pressure drop so as to actuate said adjustor means in favor of providing a minimal continuous flow of fluid through the system regardless of the total requirement of the system.
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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |