Patent US3837359A successfully refreshed from Google Patents.
US3837359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic control valve with pressure sensitive latch
Assignee: Case LLC
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Filing: 1973-05-18
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Granted: 1974-09-24
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Expires: 1993-05-18
Abstract
Abstract A valve having a fluid control spool and detent assembly for securing the spool in a predetermined position. The detent is secured by the interaction of a ball series and a groove, the holding force being delivered by hydraulic pressure. A detent release is actuated by a fall in hydraulic pressure thereby unlocking the balls. Springs return the detent and spool to a neutral position upon release.
Inventors
- 👤 R Lech
- 👤 V Nelson
- 👤 D Fadden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:21
CPC Classifications
F; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0704; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86485
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
180 words
In a hydraulic control valve for IPTO assemblies having a spool manually movable in a housing through a range of metering positions, thereby controlling high pressure fluid flow and a spool detent assembly comprising: a first sleeve means slidingly carrying a piston means, said sleeve means being fixed and having a circumferential groove means therein, said piston means including; a rod means, a second sleeve means and series of ball means, one of which is movable in and out of said second sleeve means; a first compression spring means resisting movement of said piston means; a second compression spring means transferring force from said piston to said spool means; and a stem means having first and second portion means, said first portion means being adjacent and capable of delivering and receiving force from said ball means, said second portion forming a power chamber within said spool dependent upon high pressure fluid for force to transfer against said ball means whereby they are forced outwardly into said circumferential groove means and fall out therefrom upon loss of the high pressure fluid.
Claim 2
Dependent Claim
180 words
In a hydraulic control valve for IPTO assemblies having a spool manually movable in a housing through a range of metering positions, thereby controlling high pressure fluid flow and a spool detent assembly comprising: a first sleeve means slidingly carrying a piston means, said sleeve means being fixed and having a circumferential groove means therein, said piston means including; a rod means, a second sleeve means and series of ball means, one of which is movable in and out of said second sleeve means; a first compression spring means resisting movement of said piston means; a second compression spring means transferring force from said piston to said spool means; and a stem means having first and second portion means, said first portion means being adjacent and capable of delivering and receiving force from said ball means, said second portion forming a power chamber within said spool dependent upon high pressure fluid for force to transfer against said ball means whereby they are forced outwardly into said circumferential groove means and fall out therefrom upon loss of the high pressure fluid.
Claim 3
Dependent Claim
56 words
The spool detent assembly of claim 1 whrein said stem means is an elongated rod means whereby upon the presence of high pressure fluid in said valve, said first end delivers force to said ball means and upon the absence of high pressure fluid from said valve said ball means deliver force to said first end.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |