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US3744375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid system
Assignee: Individual
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Filing: 1971-08-09
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Granted: 1973-07-10
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Expires: 1991-08-09
Abstract
Abstract A fluid system having a variable displacement fluid pump connected in a closed loop circuit to a fluid cylinder having a tubular member and a piston reciprocally mounted therein. The piston has a connecting rod extending from one side thereof and externally of the fluid cylinder. A second piston, fixedly attached to the tubular member, is reciprocally mounted within a blind bore in the connecting rod, with the outer face of the second piston and the blind end of the connecting rod defining an expansible pressure chamber. The effective pressure responsive areas of the two pistons are equal, such that when fluid at a selected rate of flow and at a predetermined pressure is communicated to the annular area on the rod side of the first piston, a force of a predetermined magnitude is generated against the piston to cause a contraction of the fluid cylinder at a predetermined rate, and when fluid at the same rate of flow and at the same predetermined pressure is communicated to the expansible chamber, a force of the same predetermined magnitude is generated between the second piston and the blind end of the connecting rod to cause an expansion of the fluid cylinder at the same predetermined rate as when the fluid cylinder is contracted. A directional control valve, disposed in the closed circuit between the inlet and outlet of the fluid pump, is adapted to selectively direct fluid to the rod side of the first piston within the fluid cylinder, while exhausting fluid from the expansible chamber and vice versa, so as to selectively expand and contract the fluid cylinder at the same rate. The rate of movement of expansion and contraction is controlled by the amount of fluid displaced by the fluid pump. A second directional control valve is adapted to direct fluid from a second source of fluid to a pressure responsive displacement control mechanism to selectively vary the displacement of the fuid pump. The rate of fluid flow to the pressure responsive displacement control mechanism is selectively varied to control the rate of displacement of the fluid pump and to thereby selectively control the rate of expansion and contraction of the fluid cylinder. When the side of the first piston opposite the rod carrying side thereof is communicated to a fluid under pressure, an additional expansion force may be selectively provided.
Inventors
- 👤 P Kubik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:01
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; F15B11/00; F15B11/02; F15B11/028; F15B11/036; F15B11/04; F15B11/046; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/30; F15B2211/305; F15B2211/30505; F15B2211/30515; F15B2211/30525; F15B2211/32; F15B2211/329; F15B2211/355; F15B2211/50; F15B2211/505; F15B2211/50509; F15B2211/50518; F15B2211/50527; F15B2211/515; F15B2211/5153; F15B2211/5154; F15B2211/60; F15B2211/61; F15B2211/613; F15B2211/615; F15B2211/63; F15B2211/6303; F15B2211/6336; F15B2211/635; F15B2211/6355; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/7055
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
429 words
A fluid system comprising: a variable displacement pressure energy translating device for providing a source of fluid pressure, said device having a fluid inlet and a fluid outlet; fluid cylinder means having a first tubular member with at least one end closed; a piston reciprocably mounted in said first tubular member and forming a first fluid chamber on one side thereof within said first tubular member, said first tubular member being movable In response to an increase in fluid in said first chamber; a connecting member carried by the other side of said piston and movable therewith; a second tubular member telescopically received by said first tubular member and radially outwardly spaced therefrom to define a second fluid chamber, said connecting member connecting said piston to said second tubular member, said second tubular member and said fluid actuated member defining a third fluid chamber; a fluid actuated member in said second fluid chamber connected to said first tubular member and movable in response to an increase in fluid in said second fluid chamber to produce movement of said fluid actuator member relative to said second tubular member; the effective pressure responsive area of said fluid actuated member exposed to the fluid in said second fluid chamber being equal to the effective pressure responsive area of said one side of said piston exposed to the fluid in said first fluid chamber, said actuated member being operable upon an increase in the fluid in said second fluid chamber to move said first tubular member in a direction toward said piston and contract said first fluid chamber, while said piston is operable upon an increase in fluid in said first fluid chamber to move said first tubular member in a direction away from said piston and expand said first fluid chamber; valve means connecting the inlet and outlet of said device to said first and second fluid chambers within said fluid cylinder means for selectively directing fluid pressure from said device to and from said first and second fluid chambers; and second valve means for selectively communicating said third fluid chamber to a source of fluid pressure while said first fluid chamber is in communication with said fluid pressure from said device, said second valve means being operable to communicate said third fluid chamber to said source of fluid pressure when the pressure of the fluid communicated to said first fluid chamber exceeds a predetermined amount, the fluid pressure communicated to said third chamber exerting a force on said fluid actuating member for maintaining said first fluid chamber in an expanded state.
Claim 2
Dependent Claim
429 words
A fluid system comprising: a variable displacement pressure energy translating device for providing a source of fluid pressure, said device having a fluid inlet and a fluid outlet; fluid cylinder means having a first tubular member with at least one end closed; a piston reciprocably mounted in said first tubular member and forming a first fluid chamber on one side thereof within said first tubular member, said first tubular member being movable In response to an increase in fluid in said first chamber; a connecting member carried by the other side of said piston and movable therewith; a second tubular member telescopically received by said first tubular member and radially outwardly spaced therefrom to define a second fluid chamber, said connecting member connecting said piston to said second tubular member, said second tubular member and said fluid actuated member defining a third fluid chamber; a fluid actuated member in said second fluid chamber connected to said first tubular member and movable in response to an increase in fluid in said second fluid chamber to produce movement of said fluid actuator member relative to said second tubular member; the effective pressure responsive area of said fluid actuated member exposed to the fluid in said second fluid chamber being equal to the effective pressure responsive area of said one side of said piston exposed to the fluid in said first fluid chamber, said actuated member being operable upon an increase in the fluid in said second fluid chamber to move said first tubular member in a direction toward said piston and contract said first fluid chamber, while said piston is operable upon an increase in fluid in said first fluid chamber to move said first tubular member in a direction away from said piston and expand said first fluid chamber; valve means connecting the inlet and outlet of said device to said first and second fluid chambers within said fluid cylinder means for selectively directing fluid pressure from said device to and from said first and second fluid chambers; and second valve means for selectively communicating said third fluid chamber to a source of fluid pressure while said first fluid chamber is in communication with said fluid pressure from said device, said second valve means being operable to communicate said third fluid chamber to said source of fluid pressure when the pressure of the fluid communicated to said first fluid chamber exceeds a predetermined amount, the fluid pressure communicated to said third chamber exerting a force on said fluid actuating member for maintaining said first fluid chamber in an expanded state.
Claim 3
Dependent Claim
41 words
The fluid system defined in claim 1 wherein said means for selectively communicating said inlet and outlet of said device to said first chamber comprises a passage extending through said connecting member and said piston and opening into said first chamber.
Claim 4
Dependent Claim
144 words
The fluid system defined in claim 1 wherein said fluid pressure energy translating device comprises a fluid pump having means for varying the displacement thereof between a minimum and maximum displacement; and pressure responsive means comprising a second fluid cylinder having a piston with a connecting rod extending from one end thereof, said extending end of said connecting rod being operatively coupled to said pump varying means, a separate source of fluid pressure being selectively communicated to opposite sides of said last-mentioned fluid cylinder; and flow control valve means disposed between said, separate source of fluid pressure and the opposite sides of said second cylinder for controlling the rate of fluid flow to said opposite sides of said second cylinder, whereby the rate of movement of said second cylinder and thus the rate of change in displacement of said fluid pump is selectively controlled.
Claim 5
Dependent Claim
77 words
The fluid system defined in claim 3 wherein said fluid system further comprises a fluid feed control valve for controlling the rate of fluid flow from said second source to one side of said second cylinder; a second fluid feed control controlling the rate of fluid flow to the other side of said second cylinder piston; a directional flow control valve for selectively controlling the flow from said second source of pressure to said feed control valve.
Claim 6
Dependent Claim
17 words
The fluid system defined in claim 4 wherein each of said feed control valves are selectively adjustable.
Claim 7
Dependent Claim
51 words
The fluid system defined in claim 3 wherein said fluid system further comprises means for adjustably varying the minimum and maximum displacement of said fluid pump at some selected displacement less than the maximum displacement of said pump and at some displacement greater than the minimum displacement of said pump, respectively.
Claim 8
Dependent Claim
99 words
The fluid system defined in claim 1 wherein said first-mentioned valve means comprises a directional control valve having an inlet and outlet port respectively connected to the outlet and inlet ports of said pressure energy translating device, said directional control valve selectively connecting the outlet of said pressure energy translating device to one of said fluid cylinder chambers, while connecting the other of said fluid cylinder chambers to the inlet of said pressure energy translating device, whereby said fluid cylinder may be selectively expanded and retracted in response to fluid flow selectively communicated to the said fluid cylinder chamber.
Claim 9
Dependent Claim
22 words
The fluid system defined in claim 7 wherein said device and said fluid cylinder are fluidly connected in a closed loop circuit.
Claim 10
Dependent Claim
349 words
A fluid cylinder comprising: a first tubular member having at least one closed end; a piston reciprocably mounted in said first tubular member and forming a first fluid chamber on one side thereof, said first tubular member being movable in response to an increase in fluid in said first fluid chamber; means for connecting said first fluid chamber to a source of fluid pressure; a connecting member carried by the other side of said piston and movable therewith; a second tubular member telescopically received by said first tubular member and radially spaced outwardly therefrom to define a second fluid chamber; said connecting member connecting said piston to said second tubular member; a fluid actuated member in said second fluid chamber connected to said first tubular member and movable in response to an increase in fluid in said second fluid chamber; means for connecting said second fluid chamber to a source of fluid pressure so as to produce movement of said fluid actuated member relative to said second tubular member; a third fluid chamber defined by said second tubular member and said fluid actuated member; and means for selectively connecting said third fluid chamber to a source of fluid pressure after the pressure in said first fluid chamber exceeds a predetermined value, the fluid pressure being communicated to said third fluid chamber generating a force against said fluid actuated member for maintaining said first fluid chamber in an expanded state; the effective pressure responsive area of said fluid actuated member exposed to the fluid in said second fluid chamber being equal to the effective pressure responsive area of the side of said piston exposed to the fluid in said first fluid chamber, said fluid actuated member being operable upon increase in fluid in said second fluid chamber to move said first tubular member in a direction toward said piston and contract said first fluid chamber, and said piston being operable upon an increase in the fluid in said first fluid chamber to move said first tubular member in a direction away from said piston and expand said first fluid chamber.
Claim 11
Dependent Claim
349 words
A fluid cylinder comprising: a first tubular member having at least one closed end; a piston reciprocably mounted in said first tubular member and forming a first fluid chamber on one side thereof, said first tubular member being movable in response to an increase in fluid in said first fluid chamber; means for connecting said first fluid chamber to a source of fluid pressure; a connecting member carried by the other side of said piston and movable therewith; a second tubular member telescopically received by said first tubular member and radially spaced outwardly therefrom to define a second fluid chamber; said connecting member connecting said piston to said second tubular member; a fluid actuated member in said second fluid chamber connected to said first tubular member and movable in response to an increase in fluid in said second fluid chamber; means for connecting said second fluid chamber to a source of fluid pressure so as to produce movement of said fluid actuated member relative to said second tubular member; a third fluid chamber defined by said second tubular member and said fluid actuated member; and means for selectively connecting said third fluid chamber to a source of fluid pressure after the pressure in said first fluid chamber exceeds a predetermined value, the fluid pressure being communicated to said third fluid chamber generating a force against said fluid actuated member for maintaining said first fluid chamber in an expanded state; the effective pressure responsive area of said fluid actuated member exposed to the fluid in said second fluid chamber being equal to the effective pressure responsive area of the side of said piston exposed to the fluid in said first fluid chamber, said fluid actuated member being operable upon increase in fluid in said second fluid chamber to move said first tubular member in a direction toward said piston and contract said first fluid chamber, and said piston being operable upon an increase in the fluid in said first fluid chamber to move said first tubular member in a direction away from said piston and expand said first fluid chamber.
Claim 12
Dependent Claim
42 words
The fluid cylinder defined in claim 9 further comprising a passage extending longitudinally through said connecting member and said piston and opening into said first fluid chamber, said source of fluid pressure being communicated to said first fluid chamber through said passage.
Claim 13
Dependent Claim
20 words
The fluid cylinder defined in claim 9 wherein said connecting member has a smaller cross sectional area than said piston.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |