US4393751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two hole hydraulic cushion valve
Assignee: CC KELLEY & SON
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Filing: 1981-01-21
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Granted: 1983-07-19
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Expires: 2001-01-21
Abstract
Abstract A cushion valve for a hydraulic piston. The valve includes two inlet ports each connected into the same end of the cylinder. One port leads directly to an outlet while the second port feeds to the outlet through a floating, restricted flow orifice to provide a cushioning effect for the piston.
Inventors
- 👤 Clarence R. Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:40
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/22; F15B15/224; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7847
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
281 words
In a cylinder having a fluid actuated piston therein, said piston being shiftable longitudinally within said cylinder by the operation of said fluid, the improvement wherein said cylinder includes two ports at one end for evacuating fluid from in front of said piston as it is urged toward said one cylinder end and for introducing fluid at the rear of said piston to urge it away from said one cylinder end, said cylinder ports being spaced longitudinally apart along the direction of travel of said piston within said cylinder with one port nearer said cylinder end than the other port, said piston being shiftable over said other cylinder port, a valve for evacuating and introducing fluid from and into said one cylinder end, said valve having first, second and third passages, each of said first and second passages in spaced communication with said third passage in the valve, a fluid flow restrictor means within said third valve passage and shiftable therein in response to fluid flow from a non-operative position to an operative position between said first and second passages for reducing the rate of fluid flow from said first valve passage into said third valve passage, said first valve passage in communication with said one cylinder port, said second valve passage in communication with said other cylinder port whereby fluid will first flow through both said first and second valve passages and out said third valve passage as the piston approaches said one cylinder end and then flow only through said first and third valve passages at a reduced rate after said piston shifts over said other cylinder port to provide a cushioning resistance to the movement of said piston.
Claim 2
Dependent Claim
281 words
In a cylinder having a fluid actuated piston therein, said piston being shiftable longitudinally within said cylinder by the operation of said fluid, the improvement wherein said cylinder includes two ports at one end for evacuating fluid from in front of said piston as it is urged toward said one cylinder end and for introducing fluid at the rear of said piston to urge it away from said one cylinder end, said cylinder ports being spaced longitudinally apart along the direction of travel of said piston within said cylinder with one port nearer said cylinder end than the other port, said piston being shiftable over said other cylinder port, a valve for evacuating and introducing fluid from and into said one cylinder end, said valve having first, second and third passages, each of said first and second passages in spaced communication with said third passage in the valve, a fluid flow restrictor means within said third valve passage and shiftable therein in response to fluid flow from a non-operative position to an operative position between said first and second passages for reducing the rate of fluid flow from said first valve passage into said third valve passage, said first valve passage in communication with said one cylinder port, said second valve passage in communication with said other cylinder port whereby fluid will first flow through both said first and second valve passages and out said third valve passage as the piston approaches said one cylinder end and then flow only through said first and third valve passages at a reduced rate after said piston shifts over said other cylinder port to provide a cushioning resistance to the movement of said piston.
Claim 3
Dependent Claim
70 words
The cylinder of claim 1 wherein said restrictor means is shiftable within said third passage between said operative and non-operative positions in response to the direction of fluid flow through the valve, said restrictive means being in its operative flow reducing position upon fluid flow from said first to said third valve passage and being in its non-operative position upon fluid flow from said third to said first valve passage.
Claim 4
Dependent Claim
19 words
The cushion valve of claim 1 wherein said restrictor means is a polygonal plate with an orifice formed therethrough.
Claim 5
Dependent Claim
74 words
The cushion valve of claim 3 wherein said restrictor means is defined by a first and second face and lateral edge, one of said faces having diametrical channel means formed therein for causing said restrictor means to shift from its non-operative position to its operative position in response to fluid flow from said first valve passage into said third valve passage, said orifice extending from said channel through said plate to said other face.
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) | 1986-07-18 | 1987-01-17 | 1987-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-18 | 1991-01-17 | 1991-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-18 | 1995-01-17 | 1995-07-19 | $7700.00 | Window Closed / Lapsed |