US4085587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fail safe liquid power device
Assignee: Individual
•
Filing: 1976-12-08
•
Granted: 1978-04-25
•
Expires: 1996-12-08
Abstract
Abstract A fluid power device such for example as one for opening and closing clam shell gates is operated by a ram under fluid pressure. A tank is provided for storing fluid under pressure and by a system of valving extension of the ram, as for a gate opening operation is inhibited until enough fluid under pressure is stored in the tank to assure completion of reverse operation of the ram to close the gates.
Inventors
- 👤 Ronald E. Garlinghouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:50
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/004; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
192 words
In a system for performing work by operation of a hydraulic ram having a piston therein forming in said ram a forward chamber and a reverse chamber, said system comprising a source of fluid at operating pressure, a fluid pressure storage container including fluid passage means connecting said container to said source, operating valve means having fluid passage means interconnecting said operating valve means with said source, said container and said ram for selectively directing fluid at said operating pressure to said chamber, said operating valve means having one adjustment wherein said operating pressure is passed to said forward chamber and said reverse chamber has a connection to exhaust, sequence valve means interconnected respectively to said container, said source and said control valve means, and energizing means for said valve means, said sequence valve means having an adjustment at pressures less than said operating pressure which inhibits passage of fluid by said operating valve means to said chambers until said container is at said operating pressure, said operating valve means having another adjustment wherein said operating pressure is passed to said reverse chamber and said forward chamber has a connection to exhaust.
Claim 2
Dependent Claim
192 words
In a system for performing work by operation of a hydraulic ram having a piston therein forming in said ram a forward chamber and a reverse chamber, said system comprising a source of fluid at operating pressure, a fluid pressure storage container including fluid passage means connecting said container to said source, operating valve means having fluid passage means interconnecting said operating valve means with said source, said container and said ram for selectively directing fluid at said operating pressure to said chamber, said operating valve means having one adjustment wherein said operating pressure is passed to said forward chamber and said reverse chamber has a connection to exhaust, sequence valve means interconnected respectively to said container, said source and said control valve means, and energizing means for said valve means, said sequence valve means having an adjustment at pressures less than said operating pressure which inhibits passage of fluid by said operating valve means to said chambers until said container is at said operating pressure, said operating valve means having another adjustment wherein said operating pressure is passed to said reverse chamber and said forward chamber has a connection to exhaust.
Claim 3
Dependent Claim
31 words
A system as in claim 1 wherein said operating valve means has an adjustment when deenergized interconnecting said storage container with said reverse chamber and said forward acting chamber to exhaust.
Claim 4
Dependent Claim
28 words
A system as in claim 1 wherein said sequence valve means is in operative association with an unloading vent operative to prevent overloading said system with fluid pressure.
Claim 5
Dependent Claim
32 words
A system as in claim 1 wherein said container has a gas chamber, a liquid chamber and a movable separator therebetween, the liquid chamber being in communication with said sequence valve means.
Claim 6
Dependent Claim
20 words
A system as in claim 4 wherein said source of fluid comprises a liquid reservoir and a power operated pump.
Claim 7
Dependent Claim
49 words
A system as in claim 5 wherein there is an unloading relief valve connected respectively to said sequence valve means and said operating valve means, said unloading relief valve having a pressure setting in excess of said operating pressure and a discharge from said relief valve to said reservoir.
Claim 8
Dependent Claim
57 words
A system as in claim 4 wherein said operating valve means comprises two valve members, one of said members having one adjustment wherein the liquid chamber is connected to said sequence valve means and disconnected from said ram and another adjustment wherein the liquid chamber is disconnected from said sequence valve means and connected to said ram.
Claim 9
Dependent Claim
77 words
A system as in claim 4 wherein said operating valve means comprises two valve members, a second of said valve members having a first adjustment wherein said sequence valve means is connected to a first of said ram chambers with a second of said ram chambers connected to exhaust and a second adjustment wherein said second of said ram chambers is connected to said sequence valve means with said first of said ram chambers connected to exhaust.
Claim 10
Dependent Claim
34 words
A system as in claim 8 wherein said second of said valve members has a third position wherein the fluid passage means from said sequence valve means to said operating valve means is blocked.
Claim 11
Dependent Claim
117 words
A system as in claim 4 wherein said operating valve means comprises two valve members, one of said valve members having one adjustment wherein the liquid reservoir is connected to said sequence valve means and disconnected from said ram and another adjustment wherein the liquid chamber is disconnected from said sequence valve means, the other of said valve members having a first adjustment wherein said sequence valve means is connected to the first of said ram chambers and a second of said ram chambers is connected to exhaust, and a second adjustment wherein said second of said ram chambers is connected to said sequence valve means and said first of said ram chambers is connected to exhaust.
References Cited (Backward Citations)
US1948951A
Cited
US2392471A
Cited
US2641106A
Cited
US2900960A
Cited
US3225663A
Cited
US3533234A
Cited
US3695023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |