Patent US4385869A successfully refreshed from Google Patents.
US4385869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocation pump
Assignee: Far East Engineering Co Ltd
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Filing: 1980-10-20
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Granted: 1983-05-31
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Expires: 2000-10-20
Abstract
Abstract A reciprocation pump has a plurality of radially arranged pumping chambers each provided with a piston and operatively connected to an external liquid absorbing pipe and an external liquid discharging pipe, and has a central drive mechanism comprising drive members each directly connected to the corresponding one of the radially arranged pistons and a valve structure operated in association with the drive members by a pressure activated fluid injected into the pump at an external inlet thereof, said valve structure sending the pressure activated fluid into and out of the pump simultaneously during the operation thereof.
Inventors
- 👤 Katsumori Omata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:56
CPC Classifications
F; F01; F01L; F01L33/00; F01L33/02; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/111; F04B9/115
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
A reciprocation pump having a plurality of radially arranged reciprocative pumping chambers each provided with a working member and operatively connected to an external liquid absorbing pipe and an external liquid discharging pipe, and a central drive mechanism, said central drive mechanism comprising drive members directly connected to the working members of the radially arranged reciprocative pumping chambers respectively, said drive members being transversely arranged shafts each provided with a pair of abutments, and a valve structure operated in association with the drive members by a pressure activated fluid, said valve structure being so formed as to send the pressure activated fluid into and out of the pump simultaneously during operation thereof, and comprising a rotary fluid switching valve and a cam disc which is coaxial with the former and rotatably driven by the reciprocation mevements of said abutments.
Claim 2
Dependent Claim
139 words
A reciprocation pump having a plurality of radially arranged reciprocative pumping chambers each provided with a working member and operatively connected to an external liquid absorbing pipe and an external liquid discharging pipe, and a central drive mechanism, said central drive mechanism comprising drive members directly connected to the working members of the radially arranged reciprocative pumping chambers respectively, said drive members being transversely arranged shafts each provided with a pair of abutments, and a valve structure operated in association with the drive members by a pressure activated fluid, said valve structure being so formed as to send the pressure activated fluid into and out of the pump simultaneously during operation thereof, and comprising a rotary fluid switching valve and a cam disc which is coaxial with the former and rotatably driven by the reciprocation mevements of said abutments.
Claim 3
Dependent Claim
19 words
A reciprocation pump as defined in claim 1, wherein the working members of said reciprocative pumping chambers are diaphragms.
Claim 4
Dependent Claim
19 words
A reciprocation pump as defined in claim 1, wherein the working members of said reciprocative pumping chambers are pistons.
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) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |