Patent US3603207A successfully refreshed from Google Patents.
US3603207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple-cylinder telescopic actuator
Assignee: Bank of New England NA
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Filing: 1969-05-26
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Granted: 1971-09-07
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Expires: 1989-05-26
Abstract
Abstract A hydraulic actuator of the type having multiple pistons and cylinders with porting and passages being provided so that each telescopic section may be selectively extended with respect to the others and also including porting and passages for selectively retracting each section with respect to the others.
Inventors
- 👤 John T Parrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:58
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
239 words
A hydraulic actuator assembly, comprising: first cylinder means, first piston means slidable in said first cylinder means and defining fluid chambers on the opposite sides of the first piston means, first rod means extending axially from said first piston means, said first rod means defining a second cylinder means, second piston means slidable in said second cylinder means and defining fluid chambers on the opposite sides of the second piston means, second rod means extending axially from said second piston means, and control means for selectively moving said first piston means relative to said first cylinder means or said second piston means with respect to said second cylinder means including first valve means for selectively porting fluid under pressure to one of the chambers associated with the first piston means and connecting the other to drain, and second valve means for selectively porting fluid under pressure to one of the chambers associated with the second piston means and connecting the other to drain, said second valve means blocking flow relative to one of the chambers associated with the second piston means when the first valve means is porting fluid under pressure to one of the chambers associated with the first piston means, said first valve means blocking flow relative to one of the chambers associated with the first piston means when the second valve means is porting fluid to one of the chamber associated with the second valve means.
Claim 2
Dependent Claim
239 words
A hydraulic actuator assembly, comprising: first cylinder means, first piston means slidable in said first cylinder means and defining fluid chambers on the opposite sides of the first piston means, first rod means extending axially from said first piston means, said first rod means defining a second cylinder means, second piston means slidable in said second cylinder means and defining fluid chambers on the opposite sides of the second piston means, second rod means extending axially from said second piston means, and control means for selectively moving said first piston means relative to said first cylinder means or said second piston means with respect to said second cylinder means including first valve means for selectively porting fluid under pressure to one of the chambers associated with the first piston means and connecting the other to drain, and second valve means for selectively porting fluid under pressure to one of the chambers associated with the second piston means and connecting the other to drain, said second valve means blocking flow relative to one of the chambers associated with the second piston means when the first valve means is porting fluid under pressure to one of the chambers associated with the first piston means, said first valve means blocking flow relative to one of the chambers associated with the first piston means when the second valve means is porting fluid to one of the chamber associated with the second valve means.
Claim 3
Dependent Claim
293 words
A hydraulic actuator assembly, comprising: first cylinder means, first piston means slidable in said first cylinder means and defining fIrst and second fluid chambers on the opposite sides of the first piston means, first rod means extending axially from said first piston means, said first rod means defining a second cylinder means, second piston means slidable in said second cylinder means and defining third and fourth fluid chambers on the opposite sides of the second piston means, second rod means extending axially from said second piston means, control means for moving said first piston means with respect to said first cylinder means without moving said second piston means with respect to said second cylinder means including means for simultaneously pressurizing said first and third chambers and for blocking flow relative to the fourth chamber, and control means for moving said second piston means with respect to said second cylinder means without moving said first piston means with respect to said first cylinder means including first valve means for selectively porting fluid under pressure to one of the chambers associated with the first piston means and connecting the other to drain, and second valve means for selectively porting fluid under pressure to one of the chambers associated with the second piston means and connecting the other to drain, said second valve means blocking flow relative to one of the chambers associated with the second piston means when the first valve means is porting fluid under pressure to one of the chambers associated with the first piston means, said first valve means blocking flow relative to one of the chambers associated with the first piston means when the second valve means is porting fluid to one of the chamber associated with the second valve means.
Claim 4
Dependent Claim
293 words
A hydraulic actuator assembly, comprising: first cylinder means, first piston means slidable in said first cylinder means and defining fIrst and second fluid chambers on the opposite sides of the first piston means, first rod means extending axially from said first piston means, said first rod means defining a second cylinder means, second piston means slidable in said second cylinder means and defining third and fourth fluid chambers on the opposite sides of the second piston means, second rod means extending axially from said second piston means, control means for moving said first piston means with respect to said first cylinder means without moving said second piston means with respect to said second cylinder means including means for simultaneously pressurizing said first and third chambers and for blocking flow relative to the fourth chamber, and control means for moving said second piston means with respect to said second cylinder means without moving said first piston means with respect to said first cylinder means including first valve means for selectively porting fluid under pressure to one of the chambers associated with the first piston means and connecting the other to drain, and second valve means for selectively porting fluid under pressure to one of the chambers associated with the second piston means and connecting the other to drain, said second valve means blocking flow relative to one of the chambers associated with the second piston means when the first valve means is porting fluid under pressure to one of the chambers associated with the first piston means, said first valve means blocking flow relative to one of the chambers associated with the first piston means when the second valve means is porting fluid to one of the chamber associated with the second valve means.
Claim 5
Dependent Claim
41 words
A hydraulic actuator assembly as defined in claim 2, including means for extending or retracting the first piston means with respect to the first cylinder means or extending or retracting said second piston means with respect to said second cylinder means.
Claim 6
Dependent Claim
24 words
A hydraulic actuator assembly as defined in claim 2 wherein said moving means simultaneously pressurizes the rod ends of both of said piston means.
Claim 7
Dependent Claim
40 words
A hydraulic actuator assembly as defined in claim 2, wherein said first and second valve means pressurizes the end of the first piston means opposite said first rod means without pressurizing the second piston means opposite the second rod means.
Claim 8
Dependent Claim
162 words
A hydraulic actuator assembly comprising: first cylinder means, first piston means in said first cylinder means, first rod means extending from said first piston means and defining a second cylinder means, second piston means slidable in said second cylinder means, second rod means extending from said second piston means, first port means in said first cylinder means adapted to be connected to a source of fluid under pressure, said first port means communicating with the side of said first piston means opposite said first rod means, second port means in said first cylinder means adapted to be connected to a source of fluid under pressure, tube means fixed with respect to said first cylinder means and communicating with said second port means, said tube means being slidable in said first piston means, and passage means in said first piston means continuously communicating with the interior of said tube means and the side of said second piston means opposite said second rod means.
Claim 9
Dependent Claim
162 words
A hydraulic actuator assembly comprising: first cylinder means, first piston means in said first cylinder means, first rod means extending from said first piston means and defining a second cylinder means, second piston means slidable in said second cylinder means, second rod means extending from said second piston means, first port means in said first cylinder means adapted to be connected to a source of fluid under pressure, said first port means communicating with the side of said first piston means opposite said first rod means, second port means in said first cylinder means adapted to be connected to a source of fluid under pressure, tube means fixed with respect to said first cylinder means and communicating with said second port means, said tube means being slidable in said first piston means, and passage means in said first piston means continuously communicating with the interior of said tube means and the side of said second piston means opposite said second rod means.
Claim 10
Dependent Claim
231 words
A hydraulic actuator assembly comprising: first cylinder means, first piston means in said first cylinder means, first rod means extending from said first piston means and defining a second cylinder means, second piston means slidable in said second cylinder means, second rod means extending from said second piston means, first port means in said first cylinder means adapted to be connected to a source of fluid under pressure, said first port means communicating with the side of said first piston means opposite said first rod means, second port means in said first cylinder means adapted to be connected to a source of fluid under pressure, tube means fixed with respect to Said first cylinder means and communicating with said second port means, said tube means being slidable in said first piston means, and passage means in said first piston means communicating with the interior of said tube means and the side of said second piston means opposite said second rod means, third port means in said first cylinder means adapted to be connected to fluid under pressure, said third port means communicating with the rod side of said first piston means, annular passage means in said first rod means communicating with the rod side of said first piston means, and passage means in said second piston means communicating said annular passage means with the rod side of said second piston means.
Claim 11
Dependent Claim
231 words
A hydraulic actuator assembly comprising: first cylinder means, first piston means in said first cylinder means, first rod means extending from said first piston means and defining a second cylinder means, second piston means slidable in said second cylinder means, second rod means extending from said second piston means, first port means in said first cylinder means adapted to be connected to a source of fluid under pressure, said first port means communicating with the side of said first piston means opposite said first rod means, second port means in said first cylinder means adapted to be connected to a source of fluid under pressure, tube means fixed with respect to Said first cylinder means and communicating with said second port means, said tube means being slidable in said first piston means, and passage means in said first piston means communicating with the interior of said tube means and the side of said second piston means opposite said second rod means, third port means in said first cylinder means adapted to be connected to fluid under pressure, said third port means communicating with the rod side of said first piston means, annular passage means in said first rod means communicating with the rod side of said first piston means, and passage means in said second piston means communicating said annular passage means with the rod side of said second piston means.
References Cited (Backward Citations)
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |