US4194719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control valve
Assignee: Bosch Rexroth AG
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Filing: 1978-04-17
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Granted: 1980-03-25
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Expires: 1998-04-17
Abstract
Abstract A multi-position flow control valve comprises a control piston movable in a boring in two opposite directions. At each end of the boring a pressure chamber is provided accommodating a pressure spring supported on a spring collar that at its end facing the boring has a conical recess. Each recess accommodates a conical projection of a supporting rod that is slidably guided in a blind end bore provided in the control piston. A spring is arranged in the blind end to urge the supporting rod into engagement with the recess in the spring collar. If a pressure fluid is introduced into one pressure chamber, it displaces the piston and compresses the biasing spring in the other pressure chamber whereby the spring biased supporting rods remain in engagement with the recesses in the spring collars.
Inventors
- 👤 Roland Ewald
- 👤 Herbert Lembke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:09
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/042; F15B13/043; F15B13/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/86614; Y10T137/86622; Y10T137/8663
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
A multi-position flow control valve comprising: a housing having an elongated boring and a plurality of control spaces opening into said boring, a control piston movable in two opposite directions in said boring and cooperating at each end thereof with spring means and pressure fluid inlet means, the surface of said piston being formed with a plurality of recesses selectively communicating with said control spaces, said spring means including a first pressure spring supported between said housing and a spring collar, said collar abutting upon the housing and being movable against the associated first spring, each end of said control piston having an axial blind end bore, a supporting rod axially movable in said bore, a second spring located in said bore and urging said rod into engagement with a matching recess in said spring collar, said pressure fluid inlet means being selectively actuated to apply pressure against one end of said piston and displace the same against the first pressure spring in the opposite spring means whereby the second springs in said blind recesses maintain the supporting rods of said piston in engagement with the associated spring collars.
Claim 2
Dependent Claim
189 words
A multi-position flow control valve comprising: a housing having an elongated boring and a plurality of control spaces opening into said boring, a control piston movable in two opposite directions in said boring and cooperating at each end thereof with spring means and pressure fluid inlet means, the surface of said piston being formed with a plurality of recesses selectively communicating with said control spaces, said spring means including a first pressure spring supported between said housing and a spring collar, said collar abutting upon the housing and being movable against the associated first spring, each end of said control piston having an axial blind end bore, a supporting rod axially movable in said bore, a second spring located in said bore and urging said rod into engagement with a matching recess in said spring collar, said pressure fluid inlet means being selectively actuated to apply pressure against one end of said piston and displace the same against the first pressure spring in the opposite spring means whereby the second springs in said blind recesses maintain the supporting rods of said piston in engagement with the associated spring collars.
Claim 3
Dependent Claim
30 words
A control valve as defined in claim 1, wherein said pressure fluid inlet means include two presetting control valves for selectively applying pressure against one end of said control piston.
Claim 4
Dependent Claim
27 words
A control valve as defined in claim 2, wherein said spring means are arranged in a pressure chamber each communicating with one of said presetting control valves.
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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |