Patent US3790146A successfully refreshed from Google Patents.
US3790146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid filled supporting leg
Assignee: Hoesch Werke AG
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Filing: 1972-10-24
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Granted: 1974-02-05
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Expires: 1992-10-24
Abstract
Abstract A fluid filled supporting leg or shock absorber has a cylinder with an end wall having duct means connecting a valve chamber into which a pressure conduit opens, with a working chamber formed in the cylinder by a piston having throttling ducts therethrough. A lifting valve for up-regulation is located in a duct and has a portion in the working chamber cooperating with a control valve for down-regulation, which is coupled with the piston in a predetermined relative position of piston and cylinder. The lifting valve is held in an open position by the control valve during up-regulation so that fluid flows into the working chamber until the control valve is coupled with the piston, and is moved away from the lifting valve which stops the flow into the working chamber. When the piston is moved during down-regulation to reduce the working chamber, fluid flows therefrom into the pressure conduit until the control valve is moved by the piston to a position closing the duct means.
Inventors
- 👤 H Pfannkuche
- 👤 H Hoffmann
- 👤 M Loehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:25
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/048; B60G17/044; F; F16; F16F; F16F9/00; F16F9/06; F16F9/08; F16F9/092; Y; Y10; Y10S; Y10S267/00; Y10S267/01
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
353 words
Fluid filled supporting leg, comprising cylinder means having at one end an end wall means formed with a valve chamber and with duct means connecting said valve chamber with the interior of said cylinder means; pressure conduit means communicating with said valve chamber; piston means including a piston rod projecting from the other end of said cylinder means, and a piston located in the interior of said cylinder means and dividing the same into a first working chamber communicating with said duct means, and a second working chamber, said piston being formed with an axial guide way and throttling conduit means connecting said first and second working chambers; lifting valve means in said valve duct means biassed to a closed position, and having a portion located in said first working chamber in said closed position; and control valve means including a control member mounted in said guide way for movement with, and relative to said piston, a control valve at one end of said control member cooperating with said valve duct mEans and with said portion of said lifting valve, spring means biassing said control valve to engage said portion and to lift said lifting valve means to an open position, and an abutment at the other end of said control member located in said second working chamber so that when pressure fluid flows from said pressure conduit means into said valve chamber while said cylinder means and piston means move apart and said lifting valve is held by said control valve in said open position, pressure fluid flows through said duct means into said first working chamber until said piston engages said abutment and moves said control member with said control valve away from said portion whereby said lifting valve means moves to said closed position and stops the flow from said pressure conduit means into said first working chamber, and so that when said piston means is moved into said cylinder means, fluid from said first working chamber flows through said duct means and said valve chamber into said pressure conduit until said control valve effects closing of said duct means.
Claim 2
Dependent Claim
353 words
Fluid filled supporting leg, comprising cylinder means having at one end an end wall means formed with a valve chamber and with duct means connecting said valve chamber with the interior of said cylinder means; pressure conduit means communicating with said valve chamber; piston means including a piston rod projecting from the other end of said cylinder means, and a piston located in the interior of said cylinder means and dividing the same into a first working chamber communicating with said duct means, and a second working chamber, said piston being formed with an axial guide way and throttling conduit means connecting said first and second working chambers; lifting valve means in said valve duct means biassed to a closed position, and having a portion located in said first working chamber in said closed position; and control valve means including a control member mounted in said guide way for movement with, and relative to said piston, a control valve at one end of said control member cooperating with said valve duct mEans and with said portion of said lifting valve, spring means biassing said control valve to engage said portion and to lift said lifting valve means to an open position, and an abutment at the other end of said control member located in said second working chamber so that when pressure fluid flows from said pressure conduit means into said valve chamber while said cylinder means and piston means move apart and said lifting valve is held by said control valve in said open position, pressure fluid flows through said duct means into said first working chamber until said piston engages said abutment and moves said control member with said control valve away from said portion whereby said lifting valve means moves to said closed position and stops the flow from said pressure conduit means into said first working chamber, and so that when said piston means is moved into said cylinder means, fluid from said first working chamber flows through said duct means and said valve chamber into said pressure conduit until said control valve effects closing of said duct means.
Claim 3
Dependent Claim
38 words
Fluid filled supporting leg as claimed in claim 1 wherein said lifting valve means is mushroom-shaped and has a large head, and a stem located in said duct means and having said projecting portion at the end thereof.
Claim 4
Dependent Claim
124 words
Fluid filled supporting leg as claimed in claim 2 wherein said duct means include at least one first duct through said end wall means closed by said head of said lifting valve in said closed position, and a second duct in which said stem is located and having a valve seat in said first working chamber; comprising check valve means in said first duct closing flow from said first working chamber into said valve chamber; and wherein said control valve closes said second duct when engaging said valve seat, and also engaging said portion for moving said lifting valve to said open position in which said head opens said first ducts whereby fluid can flow from said valve chamber into said first working chamber.
Claim 5
Dependent Claim
63 words
Fluid filled supporting leg as claimed in claim 3 wherein said second duct is an axial bore for guiding said stem, and being surrounded by said valve seat; and wherein said first duct is located radially outward of said second duct and has an end located in said valve chamber and covered by said head of said lifting valve in said closed position.
Claim 6
Dependent Claim
98 words
Fluid filled supporting leg as claimed in claim 1 wherein said duct means include an axial bore through said end wall means connecting said valve chamber with said first working chamber; and wherein said lifting valve means includes a stem located in said bore, a first head at one end of said stem located in said first working chamber and a second head at the other end of said stem and located in said valve chamber, said first head having a channel communicating with said valve chamber and being surrounded by a valve seat for said control valve.
Claim 7
Dependent Claim
55 words
Fluid filled supporting leg as claimed in claim 5 wherein said stem has a longitudinal duct connected with said channel, and a slotted tubular wall connecting said longitudinal duct with said valve chamber when said second head is spaced from said end wall means due to abutment of said control valve on said valve seat.
Claim 8
Dependent Claim
66 words
Fluid filled supporting leg as claimed in claim 6 wherein said end wall means is further formed with a radial duct having an inner end communicating with said axial bore, and an outer end which opens on the outer surface of said end wall means; and comprising a pressure conduit for connecting said outer end of said radial duct with an other fluid filled supporting leg.
Claim 9
Dependent Claim
72 words
Fluid filled supporting leg as claimed in claim 1 wherein said cylinder means include an inner cylinder cooperating with said piston, and an outer cylinder surrounding said inner cylinder and forming an annular chamber therewith; comprising a membrane in said annular chamber forming therein a pneumatic resilient means filled with air, and an oil chamber; and wherein said inner cylinder hAs an opening connecting said first working chamber with said oil chamber.
Claim 10
Dependent Claim
36 words
Fluid filled supporting leg as claimed in claim 8 wherein said outer cylinder has an opening communicating with said oil chamber and adapted to be connected with a corresponding opening in another fluid filled supporting leg.
Claim 11
Dependent Claim
48 words
Fluid filled supporting leg as claimed in claim 1 comprising first attaching means secured to said end wall means, and second attaching means secured to said projecting end of said piston rod, and adapted to be connected with the chassis and the wheel means of a motorcar, respectively.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |