Patent US3893790A successfully refreshed from Google Patents.
US3893790A
Expired / Lapsed
US
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Dual single action ram intensifier
Assignee: Bendix Corp
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Filing: 1973-05-29
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Granted: 1975-07-08
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Expires: 1993-05-29
Abstract
Abstract A ram type intensifier capable of producing a continuous flow of liquid at pressures on the order of 70,000 psi is disclosed, comprised of a pair of alternately and cyclically stroked ram cylinders, in which the flow of pressurized operating fluid to the ram chambers is from a constant pressure source controlled such that simultaneous pressurization of both ram chambers is provided at the end of each cycle so that precompression of the cylinder beginning its pressure stroke is carried out before depressurization of the cylinder ending its pressure stroke. This arrangement prevents pressure variations occurring as a result of the substantial compression of the liquid occurring at these pressure levels.
Inventors
- 👤 Endre A Mayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:29
CPC Classifications
F; F15; F15B; F15B3/00; F01; F01L; F01L25/00; F01L25/02; F01L25/04; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/117; F04B9/1176; F04B9/1178
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
359 words
A fluid actuated intensifier comprising: first ram intensifier means including a piston member disposed in a cylinder means to form an upper chamber defined by said cylinder means and one head of said piston and a lower chamber defined by the other head of said piston and said cylinder means; second ram intensifier means including a piston member disposed in a cylinder means to form an upper chamber defined by said cylinder means and one head of said piston and a lower chamber defined by the other head of said piston and said cylinder means; means for introducing fluid into said lower chambers; means for pressurizing said upper chambers including a constant pressure source capable of supplying said fluid to said upper chambers without a substantial drop in pressure due to substantial flow into said upper chambers resulting from compression of said fluid in said lower chambers; said means for pressurizing said upper chambers also including control means cyclically pressurizing said upper chambers by communication with said constant pressure source so as to cause said piston members to alternately move to pressurize said fluid introduced into said lower chambers and including means causing each of said pistons to move to a return position after said pressurization cycle, said control means further including means causing simultaneous pressurization of both of said upper chambers and means causing both piston members to simultaneously move to pressurize said lower chambers preceding the return movement of either of said piston members by said simultaneous pressurization, said control means including a pair of control valve means operatively associated with each of said ram intensifiers operable independently of each other to produce said simultaneous pressurization of said ram intensifier means, and further including start-up valve means causing said control valves to momentarily pressurize one of said upper chambers and depressurize the other of said upper chambers during start-up of said intensifier, whereby said piston members initially assume oppositive positions in said cylinder means; common outlet means receiving fluid pressurized in said lower chambers, including means providing communications of said lower chamber with said common outlet means during said pressurization and discontinuing communication during said return movement.
Claim 2
Dependent Claim
359 words
A fluid actuated intensifier comprising: first ram intensifier means including a piston member disposed in a cylinder means to form an upper chamber defined by said cylinder means and one head of said piston and a lower chamber defined by the other head of said piston and said cylinder means; second ram intensifier means including a piston member disposed in a cylinder means to form an upper chamber defined by said cylinder means and one head of said piston and a lower chamber defined by the other head of said piston and said cylinder means; means for introducing fluid into said lower chambers; means for pressurizing said upper chambers including a constant pressure source capable of supplying said fluid to said upper chambers without a substantial drop in pressure due to substantial flow into said upper chambers resulting from compression of said fluid in said lower chambers; said means for pressurizing said upper chambers also including control means cyclically pressurizing said upper chambers by communication with said constant pressure source so as to cause said piston members to alternately move to pressurize said fluid introduced into said lower chambers and including means causing each of said pistons to move to a return position after said pressurization cycle, said control means further including means causing simultaneous pressurization of both of said upper chambers and means causing both piston members to simultaneously move to pressurize said lower chambers preceding the return movement of either of said piston members by said simultaneous pressurization, said control means including a pair of control valve means operatively associated with each of said ram intensifiers operable independently of each other to produce said simultaneous pressurization of said ram intensifier means, and further including start-up valve means causing said control valves to momentarily pressurize one of said upper chambers and depressurize the other of said upper chambers during start-up of said intensifier, whereby said piston members initially assume oppositive positions in said cylinder means; common outlet means receiving fluid pressurized in said lower chambers, including means providing communications of said lower chamber with said common outlet means during said pressurization and discontinuing communication during said return movement.
References Cited (Backward Citations)
US2442916A
Cited
US2579670A
Cited
US2508298A
Cited
US2858767A
Cited
US3331329A
Cited
US3381833A
Cited
US3638424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |