Patent US3895490A successfully refreshed from Google Patents.
US3895490A
Expired / Lapsed
US
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Control circuit for a pressurized fluid engine
Assignee: Poclain SA
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Filing: 1974-02-13
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Granted: 1975-07-22
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Expires: 1994-02-13
Abstract
Abstract A control circuit for a pressurized fluid engine comprising a first main conduit and a second main conduit for connection to a fluid engine, means for connection to a main source of pressurized fluid, means for connection to a return for nonpressurized fluid, a supply selector having at least two positions, which, in its first position, connects the first conduit to the main source connection means and the second conduit to the fluid return connection means and, in its second position, blocks the first and second main conduits at its position, means for connection to a secondary source of fluid, a secondary conduit connecting the secondary source connection means to the first main conduit, a non-return valve in the secondary conduit permitting passage of fluid from the secondary source connection means to the first main conduit, a distributor having two positions, arranged in the first and second main conduits, defining two separate portions of each of the main conduits and which, in its first position, places the two portions of each of the main conduits in communication and, in its second position, isolates the two portions of the respective main conduits from each other, a connection conduit which, in the second position of the distributor, connects those portions of the first and second main conduits to be connected to the engine, a discharge conduit which connects the connection conduit to nonreturn connection means, a main restriction in the discharge conduit, and a secondary restriction in the portion of the connection conduit between the union of the connection conduit to the first main conduit and to the discharge conduit.
Inventors
- 👤 Jean G Pachins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:34
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/4148; F16H61/44; F16H61/452
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
273 words
Control circuit for a pressurized fluid engine comprising: a first main conduit and a second main conduit for connection to the fluid engine; means for connection to a main source of pressurized fluid; means for connection to a return for non-pressurized fluid; a supply selector having at least two positions, which, in its first position, connects said first conduit to said main source connection means and said second conduit to said fluid return connection means and, in its second position, blocks said first and second main conduits at its position; means for connection to a secondary source of pressurized fluid; a secondary conduit connecting said secondary source connection means to said first main conduit; a non-return valve in the said secondary conduit permitting passage of fluid from said secondary source connection means to said first main conduit; a distributor having two positions, arranged in said first and second main conduits, defining two separate portions of each of said main conduits, and which, in its first position, places said two portions of each of said main conduits in communication and, in its second position, isolates said two portions of each said respective main conduit from each other; a connection conduit which, in the second position of the distributor, connects those of said portions of said first and second main conduits to be connected to the engine; a discharge conduit which connects said connection conduit to a return connection means; a main restriction in said discharge conduit; and a secondary restriction in the portion of said connection conduit between the union of said connection conduit to said first main conduit and to said discharge conduit.
Claim 2
Dependent Claim
273 words
Control circuit for a pressurized fluid engine comprising: a first main conduit and a second main conduit for connection to the fluid engine; means for connection to a main source of pressurized fluid; means for connection to a return for non-pressurized fluid; a supply selector having at least two positions, which, in its first position, connects said first conduit to said main source connection means and said second conduit to said fluid return connection means and, in its second position, blocks said first and second main conduits at its position; means for connection to a secondary source of pressurized fluid; a secondary conduit connecting said secondary source connection means to said first main conduit; a non-return valve in the said secondary conduit permitting passage of fluid from said secondary source connection means to said first main conduit; a distributor having two positions, arranged in said first and second main conduits, defining two separate portions of each of said main conduits, and which, in its first position, places said two portions of each of said main conduits in communication and, in its second position, isolates said two portions of each said respective main conduit from each other; a connection conduit which, in the second position of the distributor, connects those of said portions of said first and second main conduits to be connected to the engine; a discharge conduit which connects said connection conduit to a return connection means; a main restriction in said discharge conduit; and a secondary restriction in the portion of said connection conduit between the union of said connection conduit to said first main conduit and to said discharge conduit.
Claim 3
Dependent Claim
117 words
A circuit in accordance with claim 1 for a reversible fluid engine, wherein said selector has a third position in which said first main conduit is connected to said fluid return connection means, and said second main conduit is connected to said main source connection means, and another secondary conduit connects said secondary source connection means to said second main conduit, a non-return valve being arranged in said other secondary conduit and permitting passage of fluid from said secondary source connection means to said second main conduit, and a secondary restriction is provided in the portion of said connection conduit between the union of said connection conduit to said second main conduit and to said discharge conduit.
Claim 4
Dependent Claim
46 words
A circuit in accordance with claim 1, wherein the movable elements of said supply selector and of said distributor are linked to each other such that said selector and said distributor are concomitantly placed either in their first respective positions or in their second respective positions.
Claim 5
Dependent Claim
56 words
A circuit in accordance With claim 1 of the open type, including a discharge reservoir connected to said return connection means, and wherein said selector consists of a distributor having at least two positions and which is connected to said main source connection means, to said discharge reservoir and to said first and second main conduits.
Claim 6
Dependent Claim
40 words
A circuit in accordance with claim 1 of the closed type, including a main fluid source provided with means for adjusting its delivery flow-rate, and optionally the direction of this delivery, the supply selector consisting of said delivery adjustment means.
Claim 7
Dependent Claim
56 words
A circuit in accordance with claim 2 of the open type, including a discharge reservoir connected to said return connection means, and wherein said selector consists of a distributor having at least two positions and which is connected to said main source connection means, to said discharge reservoir and to said first and second main conduits.
Claim 8
Dependent Claim
40 words
A circuit in accordance with claim 2 of the closed type, including a main fluid source provided with means for adjusting its delivery flow-rate, and optionally the direction of this delivery, the supply selector consisting of said delivery adjustment means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |