US3835751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid operated system
Assignee: Leesona Corp
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Filing: 1973-07-05
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Granted: 1974-09-17
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Expires: 1993-07-05
Abstract
Abstract A fluid operated system controls a reversible fluid operated apparatus and is herein described in the form of a speed control system for a reversible motor such as a double-acting cylinder housing a piston. The piston is selectively driven in either of opposite directions by a pressurized operating fluid introduced into one end of the cylinder while the opposite end of the cylinder is vented. Control devices in conduits opening into opposite ends of the cylinder regulate the piston speed. If desired only one of the conduits may be provided with a control device so that the piston moves at maximum speed in one direction and more slowly in the opposite direction. Each control device includes a restriction to the flow of fluid through the associated conduit, and has a by-pass with a fluid piloted diaphragm valve about the restriction, the fluid pilot operatively communicating with the opposite conduit. When operating fluid passes through one of the conduits to operate the cylinder, the valve associated with the other conduit is piloted closed so that fluid vented from the cylinder passes through the restriction of the other conduit, thus retarding the venting rate of the fluid and slowing movement of the piston. If desired, one or both restrictions may be of a variable type.
Inventors
- 👤 L Cowan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:46
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/02; F15B11/04; F15B11/044; F15B2211/00; F15B2211/30; F15B2211/305; F15B2211/30525; F15B2211/40; F15B2211/405; F15B2211/40515; F15B2211/46; F15B2211/47; F15B2211/473; F15B2211/70; F15B2211/705; F15B2211/7051; F15B2211/7053; F15B2211/75
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
A fluid operated control system for operating fluid operated piston means through a power stroke comprising, means defining a pair of paths for passage of fluid to and from said piston means, control means connected with said paths for selectively providing operating fluid to one of said paths at a predetermined rate of flow for actuating said power stroke and for venting the other of said paths to permit exhaust of said piston means, fluid flow restriction means in said other path, said fluid flow restriction means being operable to afford uninterrupted venting passage of fluid in said other path at a rate of flow less than said predetermined rate, a bypass valve in parallel with said restriction means, said valve having open and closed positions respectively permitting in open position said predetermined rate of flow and in said closed position said rate of flow less than said predetermined rate, a fluid pilot connected with said valve, and means for providing pilot fluid from said one path to said fluid pilot coincidently with providing the operating fluid to said one path throughout the entire power stroke to thereby move said valve to said closed position thereby venting the other of said paths to permit completion of said power stroke said valve has a diaphragm operable in unflexed position to permit the flow of fluid through the valve, and said fluid pilot flexEs the diaphragm to seat on and close said path.
Claim 2
Dependent Claim
241 words
A fluid operated control system for operating fluid operated piston means through a power stroke comprising, means defining a pair of paths for passage of fluid to and from said piston means, control means connected with said paths for selectively providing operating fluid to one of said paths at a predetermined rate of flow for actuating said power stroke and for venting the other of said paths to permit exhaust of said piston means, fluid flow restriction means in said other path, said fluid flow restriction means being operable to afford uninterrupted venting passage of fluid in said other path at a rate of flow less than said predetermined rate, a bypass valve in parallel with said restriction means, said valve having open and closed positions respectively permitting in open position said predetermined rate of flow and in said closed position said rate of flow less than said predetermined rate, a fluid pilot connected with said valve, and means for providing pilot fluid from said one path to said fluid pilot coincidently with providing the operating fluid to said one path throughout the entire power stroke to thereby move said valve to said closed position thereby venting the other of said paths to permit completion of said power stroke said valve has a diaphragm operable in unflexed position to permit the flow of fluid through the valve, and said fluid pilot flexEs the diaphragm to seat on and close said path.
Claim 3
Dependent Claim
73 words
A system as set forth in claim 1 wherein said one path includes further fluid flow restriction means, said fluid flow restriction means being operable to afford continuous passage of fluid in said one path at a rate of flow less than said predetermined rate, a further fluid piloted valve in parallel with the last said restriction means, and means for providing pilot fluid from said other path for operating said further valve.
Claim 4
Dependent Claim
53 words
A system as set forth in claim 2 wherein said valve and said further valve each has a diaphragm operable in unflexed position to permit the flow of fluid through the associated valve, and said fluid pilot associated with each said valve flexes the respective diaphragm to seat on and close said path.
Claim 5
Dependent Claim
87 words
A system as set forth in claim 1 wherein said piston means includes a piston slidable within a chamber, said one path is connected at a first end of said chamber and said other path is connected at a second end of said chamber remote from said first end, operating fluid provided through said first path acting to bias said piston toward the second end of said chamber, said piston when moved toward said second end acting to force fluid within said chamber through said other path.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |