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US3648968A
Expired / Lapsed
US
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Fluid flow control mechanism
Assignee: Hamilton Co Inc
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Filing: 1969-08-07
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Granted: 1972-03-14
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Expires: 1989-08-07
Abstract
Abstract A foot pedal fluid control valve having a normally closed movable valve member substantially balanced by fluid pressure with the effective pressure thereon in the closing direction sufficiently greater than the effective pressure in the opening direction to normally maintain said valve closed. The valve is connected with a pair of pistons of slightly different sized pressure areas upon which fluid pressure is exerted in opposite directions to render the valve very sensitive and responsive for very accurate control.
Inventors
- 👤 John D Reid
- 👤 Arthur C Seibel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:49
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/363
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
211 words
A fluid flow control mechanism, comprising: A. means defining an outlet port and a fluid inlet having a connection with said outlet port; B. a movable valve member cooperating with said outlet port to control the flow of fluid therethrough; C. means connected with said movable valve member for actuating same, said means having pistons with opposed pressure areas for urging said movable valve member in opening and closing directions, respectively, the pressure on one of said pistons being effective to urge said valve in the closing direction with slightly greater force than the effective pressure on the other of said pistons; D. fluid pressure operated means for moving said valve member in the opening direction, said means for moving the valve member in the opening direction includes a hydraulic cylinder and a third piston therein having a pressure area on which hydraulic pressure acts in the valve opening direction; a second hydraulic cylinder; a fourth piston operably mounted in said hydraulic cylinder, said piston having a pressure area adapted to be subjected to hydraulic pressure for urging the valve member in the valve opening direction, a piston rod for the fourth piston; a pedal having an operable connection with said piston rod; and means operably connecting the hydraulic cylinders together.
Claim 2
Dependent Claim
211 words
A fluid flow control mechanism, comprising: A. means defining an outlet port and a fluid inlet having a connection with said outlet port; B. a movable valve member cooperating with said outlet port to control the flow of fluid therethrough; C. means connected with said movable valve member for actuating same, said means having pistons with opposed pressure areas for urging said movable valve member in opening and closing directions, respectively, the pressure on one of said pistons being effective to urge said valve in the closing direction with slightly greater force than the effective pressure on the other of said pistons; D. fluid pressure operated means for moving said valve member in the opening direction, said means for moving the valve member in the opening direction includes a hydraulic cylinder and a third piston therein having a pressure area on which hydraulic pressure acts in the valve opening direction; a second hydraulic cylinder; a fourth piston operably mounted in said hydraulic cylinder, said piston having a pressure area adapted to be subjected to hydraulic pressure for urging the valve member in the valve opening direction, a piston rod for the fourth piston; a pedal having an operable connection with said piston rod; and means operably connecting the hydraulic cylinders together.
Claim 3
Dependent Claim
17 words
The invention defined by claim 1, wherein the pedal has a pivotal connection with the piston rod.
Claim 4
Dependent Claim
197 words
A fluid flow control mechanism, comprising: A. means defining an outlet port, an inlet passage and a series of cylinders in axial alignment with each other and with the outlet port, there being a. a first cylinder, b. a second cylinder of substantially greater diameter than the first cylinder, c. and a third cylinder of slightly greater diameter than the first cylinder; B. a valve core having a. a valve member cooperable with the outlet port and movable to vary the effective size of said port, b. a first piston operably disposed in the first cylinder, and having a pressure area on which fluid pressure acts in the valve opening direction, c. a second piston operably disposed in the second cylinder, d. a third piston operably disposed in the third cylinder, said third piston having a slightly greater oppositely positioned effective pressure area than that of the first piston and e. passageway means in the first mentioned means for conveying fluid under pressure to the first and third pistons to slightly unbalance the valve core pneumatically in the valve closing direction, C. and means for applying fluid pressure to the second piston in the valve opening direction.
Claim 5
Dependent Claim
197 words
A fluid flow control mechanism, comprising: A. means defining an outlet port, an inlet passage and a series of cylinders in axial alignment with each other and with the outlet port, there being a. a first cylinder, b. a second cylinder of substantially greater diameter than the first cylinder, c. and a third cylinder of slightly greater diameter than the first cylinder; B. a valve core having a. a valve member cooperable with the outlet port and movable to vary the effective size of said port, b. a first piston operably disposed in the first cylinder, and having a pressure area on which fluid pressure acts in the valve opening direction, c. a second piston operably disposed in the second cylinder, d. a third piston operably disposed in the third cylinder, said third piston having a slightly greater oppositely positioned effective pressure area than that of the first piston and e. passageway means in the first mentioned means for conveying fluid under pressure to the first and third pistons to slightly unbalance the valve core pneumatically in the valve closing direction, C. and means for applying fluid pressure to the second piston in the valve opening direction.
Claim 6
Dependent Claim
14 words
The invention defined by claim 3, wherein the last mentioned means comprises hydraulic means.
Claim 7
Dependent Claim
71 words
The invention defined by claim 3, wherein there is a short cylinder portion at the upstream side of said port terminating in a shoulder at said port; said valve core having an annular groove at the inner end of the valve member; and a seal in said groove, said seal being in said short cylinder portion and bearing against said shoulder when the valve member is in the valve closed position.
Claim 8
Dependent Claim
51 words
The invention defined by claim 5, wherein said valve membeR has an inner tapered portion and an outer tapered portion, the latter having a greater taper than the inner portion, the base of the inner portion being disposed in said port when the valve member is in the valve closed position.
References Cited (Backward Citations)
US2070489A
Cited
US2230718A
Cited
US2634754A
Cited
US2815921A
Cited
US2783020A
Cited
US2839264A
Cited
US2811958A
Cited
US3385561A
Cited
US3331583A
Cited
US3512550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |