US3593616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic safety or overload release mechanism
Assignee: Bomford and Evershed Ltd
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Filing: 1969-06-16
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Granted: 1971-07-20
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Expires: 1989-06-16
Abstract
Abstract A hydraulic ram for use as a safety or overload device comprises a cylinder closed at one end, a piston within and movable along the cylinder with a piston rod projecting through a fluid seal or gland at the other end thereof, an inlet for pressure fluid into the gland end of the cylinder, a passageway for fluid connecting the two ends of the cylinder, a nonreturn valve in said passageway permitting substantially free flow from the gland end to the closed end and a pressure relief valve arranged to permit flow of fluid out of the closed end when the pressure in the closed end exceeds a predetermined value or a predetermined value above that in the gland end.
Inventors
- 👤 John Vaudrey Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:36
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/08; F15B15/14; F15B15/1423; F15B15/1447; A; A01; A01B; A01B61/00; A01B61/04; A01B61/044; A01B61/046; F15B15/149
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
A yieldable structure comprising in combination a first member, a second member pivotally connected to said first member, a strut connecting together the first and second members at an angle to one another, said strut comprising a hydraulic ram having a cylinder closed at one end, a piston within and movable along the cylinder with a piston rod projecting through a fluid seal or gland at the other end of the cylinder, an inlet to said cylinder at the gland end, a passageway for fluid connecting the two ends of the cylinder and provided with a nonreturn valve permitting substantially free flow from the gland end to the closed end, a second passageway for fluid connecting the two ends of the cylinder and provided with a pressure release valve arranged to permit flow of fluid from the closed end to the open end when the pressure of the fluid in the closed end exceeds a predetermined value, or a predetermined value above that in the gland end, each valve having biassing means, the biassing means of the pressure release valve being greater than that of the nonreturn valve, and means to supply fluid under pressure to said inlet.
Claim 2
Dependent Claim
198 words
A yieldable structure comprising in combination a first member, a second member pivotally connected to said first member, a strut connecting together the first and second members at an angle to one another, said strut comprising a hydraulic ram having a cylinder closed at one end, a piston within and movable along the cylinder with a piston rod projecting through a fluid seal or gland at the other end of the cylinder, an inlet to said cylinder at the gland end, a passageway for fluid connecting the two ends of the cylinder and provided with a nonreturn valve permitting substantially free flow from the gland end to the closed end, a second passageway for fluid connecting the two ends of the cylinder and provided with a pressure release valve arranged to permit flow of fluid from the closed end to the open end when the pressure of the fluid in the closed end exceeds a predetermined value, or a predetermined value above that in the gland end, each valve having biassing means, the biassing means of the pressure release valve being greater than that of the nonreturn valve, and means to supply fluid under pressure to said inlet.
Claim 3
Dependent Claim
34 words
A yieldable structure according to claim 1 in which said passageways are provided in the piston and extend therethrough from one face to the other, the corresponding valves being provided in the piston head.
Claim 4
Dependent Claim
46 words
A yieldable structure according to claim 1 in which said one member carries working means including a hydraulic motor, the strut being operable by collapsing movement to reduce the head on the motor, said inlet being connected to the supply of pressurized fluid to the motor.
Claim 5
Dependent Claim
25 words
A yieldable structure according to claim 1, in which the inlet to the ram is connected to a source of pressure fluid at constant pressure.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |