US3683748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system
Assignee: Robert Bosch GmbH
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Filing: 1970-10-09
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Granted: 1972-08-15
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Expires: 1990-10-09
Abstract
Abstract A piston is slidably accommodated in a cylinder and subdivides the interior thereof into a first and a second chamber located at opposite axial sides of the piston. A supply conduit communicates with the first cylinder chamber. A source of pressurized fluid includes a pressure conduit and a fluid reservoir includes a return conduit. A control unit is connected with all of these conduits and includes a control member slidable between a neutral position in which it disconnects the supply conduit from the pressure conduit and from the return flow conduit, a first operating position in which it connects the supply conduit with the pressure conduit while disconnecting it from the return flow conduit, and a second operating position in which it connects the supply conduit with both the pressure conduit and the return flow conduit. A throttling passage connects the cylinder chambers with one another.
Inventors
- 👤 Willy Mahl
- 👤 Walter Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:16
CPC Classifications
A; A01; A01D; A01D57/00; A01D57/01; A01D57/02; A01D57/04; F; F15; F15B; F15B15/00; F15B15/20; F15B15/204; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
In a hydraulic system for use in agricultural machines, a combination comprising cylinder means; piston means slidably accommodated in said cylinder means and subdividing the interior thereof in a first and a second cylinder chamber located at opposite sides of said piston means; a supply conduit communicating with said first cylinder chamber; a source of pressurized fluid, including a pressure conduit; a fluid reservoir, including a return-flow conduit; control means connected with said conduits and including a control member movable between a neutral position disconnecting said supply conduit from said pressure conduit and from said return-flow conduit, a first operating position connecting said supply conduit with said pressure conduit while disconnecting it from said return-flow conduit, and a second operating position connecting said supply conduit with both said pressure conduit and said return-flow conduit; fluid-conducting means connecting said cylinder chambers with one another in permanent open communication with each other; and throttling means interposed in said fluid-conducting means for throttling the flow of fluid therethrough.
Claim 2
Dependent Claim
165 words
In a hydraulic system for use in agricultural machines, a combination comprising cylinder means; piston means slidably accommodated in said cylinder means and subdividing the interior thereof in a first and a second cylinder chamber located at opposite sides of said piston means; a supply conduit communicating with said first cylinder chamber; a source of pressurized fluid, including a pressure conduit; a fluid reservoir, including a return-flow conduit; control means connected with said conduits and including a control member movable between a neutral position disconnecting said supply conduit from said pressure conduit and from said return-flow conduit, a first operating position connecting said supply conduit with said pressure conduit while disconnecting it from said return-flow conduit, and a second operating position connecting said supply conduit with both said pressure conduit and said return-flow conduit; fluid-conducting means connecting said cylinder chambers with one another in permanent open communication with each other; and throttling means interposed in said fluid-conducting means for throttling the flow of fluid therethrough.
Claim 3
Dependent Claim
32 words
In a hydraulic system as defined in claim 1, wherein said piston means comprises at least one piston rod extending through one of said cylinder chambers and outwardly of said cylinder means.
Claim 4
Dependent Claim
45 words
In a hydraulic system as defined in claim 1, said piston means comprising a differential piston having one pressure surface of a smaller surface area exposed in said second chamber, and an other pressure surface of a larger surface area exposed in said first chamber.
Claim 5
Dependent Claim
22 words
In a hydraulic system as defined in claim 1, said fluid-conducting means and said throttling means being provided in said piston means.
Claim 6
Dependent Claim
36 words
In a hydraulic system as defined in claim 1, said piston means comprising a piston; and wherein said fluid-conducting means comprises a channel provided in said piston and permanently communicating with said first and second chambers.
Claim 7
Dependent Claim
15 words
In a hydraulic system as defined in claim 5, said throttling means comprising a constriction.
Claim 8
Dependent Claim
29 words
In a hydraulic system as defined in claim 1, said fluid-conducting means comprising a fluid-conducting conduit permanently communicating with said supply conduit and with said second cylinder chamber, respectively.
Claim 9
Dependent Claim
39 words
In a hydraulic system as defined in claim 1, said cylinder means having a peripheral wall; and wherein said fluid-conducting means comprises a channel provided in said peripheral wall and permanently communicating with said first and second chambers, respectively.
Claim 10
Dependent Claim
36 words
In a hydraulic system as defined in claim 1, wherein said control means comprises a housing, and wherein said control member is accommodated in said housing and slidable between said neutral position and said operating positions.
Claim 11
Dependent Claim
45 words
In a hydraulic system as defined in claim 1, said throttling means having a throttling passage; and further comprising varying means for varying the active cross-sectional area of said throttling passage to thereby obtain a concomitant variation in the throttling action of said throttling 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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |