US3619087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free piston-type pump
Assignee: Individual
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Filing: 1969-12-17
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Granted: 1971-11-09
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Expires: 1989-12-17
Abstract
Abstract A free piston-type pump having two or more cylinders with each cylinder being connected to a chamber and a free piston being reciprocatingly received therein. Each chamber is connected to a common inlet and outlet manifold. A fluid to be pumped is connected to the inlet manifold by a pump which provides a low positive pressure therein, while a high-pressure power fluid is connected to an opposite side of the piston so as to reciprocate the piston with great force in one direction while the fluid to be pumped reciprocates the piston with a lesser force in an opposite direction. Hydraulic flow control means connected to a plurality of such cylinders provides uninterrupted use of the power fluid by continuously downstroking one piston while another piston is on the upstroke.
Inventors
- 👤 Archie W Beeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:50
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F01; F01L; F01L25/00; F01L25/02; F01L25/04; F04B15/00; F04B15/02; F04B9/00; F04B9/08; F04B9/10; F04B9/109; F04B9/117; F04B9/1176
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
277 words
A pump assembly for pumping one fluid with a power fluid comprising; in combination: a pump case, said pump case having means forming a cavity therein, inlet and outlet check valve means for controlling flow of the one fluid into and out of the cavity; an elongated cylinder means attached to said case and having an internal bore which is in flow communication with the cavity; a free piston means reciprocatingly received within the internal bore and dividing the internal bore of said cylinder into upper and lower cylinder chambers; said free piston including a mandrel having opposed ends with an enlargement formed thereon intermediate the opposed ends, and a retainer means removably received at each opposed end; an expander and a seal means compressed between each said retainer and said enlargement with said expander urging said seal means against the inside peripheral wall surface of the internal bore; an inlet manifold flow connected to said inlet check valve; means including a low-pressure pump flow connected to said inlet manifold for causing the one fluid to flow through said inlet manifold and into the cavity to thereby upstroke said piston; an outlet manifold flow connected to said outlet check valve for conducting high-pressure fluid flow therefrom; a source of power fluid for downstroking said piston; flow control means flow connecting the source of power fluid to said upper cylinder chamber; said flow control means providing cyclic flow of power fluid from the source to said upper cylinder chamber, and vice versa, to thereby downstroke said free piston and then to enable the power fluid to be exhausted From the upper chamber upon said free piston being upstroked.
Claim 2
Dependent Claim
277 words
A pump assembly for pumping one fluid with a power fluid comprising; in combination: a pump case, said pump case having means forming a cavity therein, inlet and outlet check valve means for controlling flow of the one fluid into and out of the cavity; an elongated cylinder means attached to said case and having an internal bore which is in flow communication with the cavity; a free piston means reciprocatingly received within the internal bore and dividing the internal bore of said cylinder into upper and lower cylinder chambers; said free piston including a mandrel having opposed ends with an enlargement formed thereon intermediate the opposed ends, and a retainer means removably received at each opposed end; an expander and a seal means compressed between each said retainer and said enlargement with said expander urging said seal means against the inside peripheral wall surface of the internal bore; an inlet manifold flow connected to said inlet check valve; means including a low-pressure pump flow connected to said inlet manifold for causing the one fluid to flow through said inlet manifold and into the cavity to thereby upstroke said piston; an outlet manifold flow connected to said outlet check valve for conducting high-pressure fluid flow therefrom; a source of power fluid for downstroking said piston; flow control means flow connecting the source of power fluid to said upper cylinder chamber; said flow control means providing cyclic flow of power fluid from the source to said upper cylinder chamber, and vice versa, to thereby downstroke said free piston and then to enable the power fluid to be exhausted From the upper chamber upon said free piston being upstroked.
Claim 3
Dependent Claim
239 words
The pump assembly of claim 1, wherein said pump case includes means forming a second cavity therein, inlet and outlet check valve means for controlling flow of the one fluid through said second cavity; a second elongated cylinder having means forming an internal bore; said bore being in communication with said second cavity; said second cylinder being attached to and depending from said case; a second free piston reciprocatingly received within the internal bore and dividing said second cylinder into upper and lower cylinder chambers; said inlet manifold being flow connected to said inlet check valve of each pump; pump means for forcing a low-pressure flow of the one fluid through said inlet manifold and into the second cavity for upstroking said second free piston; said outlet manifold being connected to said outlet check valve of said second cavity for conducting high-pressure fluid flow therefrom; said flow control means connecting the source of power fluid to said upper cylinder chamber of the second cylinder, said flow control means providing cyclic flow of fluid from the source to said upper chamber of said second cylinder, and vice versa, to thereby downstroke said second free piston and to enable the power fluid to be exhausted from the upper chamber upon said second free piston being upstroked; whereby: said flow control means provides power fluid flow to the first recited cylinder while spent power fluid is being returned from the second cylinder.
Claim 4
Dependent Claim
42 words
The pump assembly of claim 1 wherein said means for conducting flow of one fluid into said inlet cavity includes a pump means having an output pressure which exceeds the static pressure of the upper cylinder chamber when the piston is upstroking.
Claim 5
Dependent Claim
84 words
The pump assembly of claim 1, wherein said pump case includes at least two cavities, with each cavity having a cylinder assembly attached thereto; said flow control means provides flow of power fluid to one upper cylinder chamber while spent power fluid returns from another upper cylinder chamber; said means for conducting flow of one fluid into said inlet cavity includes a pump means having a pressure output which exceeds the static pressure of the upper cylinder chamber when the piston therein is upstroking.
Claim 6
Dependent Claim
76 words
The pump assembly of claim 4 wherein said flow control means further includes a hydraulic pump, a first valve means connected to the upper cylinder chamber and to a reservoir, a second valve means connected to a second upper cylinder chamber and to said reservoir; pressure responsive means connected to cause said first and second valve means to bypass fluid flow from an upper cylinder chamber when the free piston reaches the end of its stroke.
Claim 7
Dependent Claim
113 words
The pump assembly of claim 1 wherein said pump case includes at least two cavities, with each cavity having a cylinder attached thereto; said flow control means provides flow of power fluid to one upper cylinder chamber while spent power fluid returns from another upper cylinder chamber; said flow control means further includes a hydraulic pump, a first valve means connected to the upper cylinder chamber and to a reservoir, a second valve means connected to a second upper cylinder chamber and to said reservoir; pressure responsive means connected to cause said valve means to bypass power fluid flow from a chamber when the free piston thereof reaches the end of its stroke.
Claim 8
Dependent Claim
253 words
A pump assembly for pumping one fluid with a power fluid comprising; in combination: a pump case, said pump case having means forming two separate cavities therein, inlet and outlet check valve means for controlling flow of the one fluid through each of the cavities; an elongated cylinder means for each of said cavities, each cylinder having an internal bore, means by which said internal bore is in flow communication with its respective said cavity; a free piston means for each cylinder, eaCh piston being reciprocatingly received within the internal bore and dividing the cylinder within which it is located into upper and lower cylinder chambers; an inlet manifold, means by which said inlet manifold is flow connected to each of said inlet check valves, a low-pressure pump means for causing flow of the one fluid through said inlet manifold and into each of the cavities for upstroking each said piston; an outlet manifold, means by which said outlet manifold is flow connected to each of said outlet check valves for conducting high-pressure fluid flow from the pump; a source of power fluid for downstroking each said piston; flow control means connecting the source of power fluid to each said upper cylinder chambers, said flow control means providing cyclic flow of fluid from the source to alternate ones of said upper cylinder chambers, and vice versa, to thereby downstroke one said free piston and thereafter to enable the power fluid to be exhausted from the upper chamber upon said free piston being upstroked.
Claim 9
Dependent Claim
253 words
A pump assembly for pumping one fluid with a power fluid comprising; in combination: a pump case, said pump case having means forming two separate cavities therein, inlet and outlet check valve means for controlling flow of the one fluid through each of the cavities; an elongated cylinder means for each of said cavities, each cylinder having an internal bore, means by which said internal bore is in flow communication with its respective said cavity; a free piston means for each cylinder, eaCh piston being reciprocatingly received within the internal bore and dividing the cylinder within which it is located into upper and lower cylinder chambers; an inlet manifold, means by which said inlet manifold is flow connected to each of said inlet check valves, a low-pressure pump means for causing flow of the one fluid through said inlet manifold and into each of the cavities for upstroking each said piston; an outlet manifold, means by which said outlet manifold is flow connected to each of said outlet check valves for conducting high-pressure fluid flow from the pump; a source of power fluid for downstroking each said piston; flow control means connecting the source of power fluid to each said upper cylinder chambers, said flow control means providing cyclic flow of fluid from the source to alternate ones of said upper cylinder chambers, and vice versa, to thereby downstroke one said free piston and thereafter to enable the power fluid to be exhausted from the upper chamber upon said free piston being upstroked.
Claim 10
Dependent Claim
64 words
The pump assembly of claim 7 wherein said free piston includes: a mandrel having opposed ends with an enlargement formed thereon intermediate the opposed ends, and a retainer removably received at each opposed end; an expander and a seal means compressed between each said retainer and said enlargement with said expander urging said seal means against the peripheral wall surface of the internal bore.
Claim 11
Dependent Claim
63 words
The pump assembly of claim 7, wherein said flow control means provides flow to one upper cylinder chamber while fluid returns from another upper cylinder chamber; said low-pressure pump means for conducting flow of one fluid into said inlet cavity includes a pump having a pressure output which exceeds the static pressure of the upper cylinder chamber when the piston therein is upstroking.
Claim 12
Dependent Claim
76 words
The pump assembly of claim 7 wherein said flow control means further includes a hydraulic pump, a first valve means connected to the upper cylinder chamber and to a reservoir, a second valve means connected to said second upper cylinder chamber and to said reservoir; pressure responsive means connected to each cylinder chamber for causing said valve means to preclude fluid flow into the upper chamber when the free piston reaches the end of its downstroke.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |