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Patent US3793831A successfully refreshed from Google Patents.
US3793831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolic control valve
Assignee: Deutz Allis Corp
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Filing: 1972-06-08
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Granted: 1974-02-26
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Expires: 1992-06-08
Abstract
Abstract A control valve consisting of two-way normally closed solenoid operated poppet valves and two-way normally open solenoid operated poppet valves. The normally closed solenoid operated valves are arranged to direct flow to and from a cylinder in the desired manner. For the control of each single acting cylinder, two normally closed solenoid operated valves are required, whereas, for a double acting cylinder, four normally closed solenoid operated and two check valves are needed. These sets of solenoid operated valves are incorporated in a single body or manifold to control the different functions on a combine such as reel height, reel speed, auger swing and tracton drive. The control valve also includes low flow circuit relief valve set at 2,000 psi and a 300 psi relief valve to satisfy maximum pressure conditions for reel speed operation. The valve is located near to a supply pump and the pump flow passes through the normally open two-way solenoid operated valve and back to sump to minimize pressure drop in neutral.
Inventors
- 👤 R Khatti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:12
CPC Classifications
F; F15; F15B; F15B21/00; F15B21/08; Y; Y10; Y10S; Y10S60/00; Y10S60/911
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
244 words
In combination in self-propelled mobile equipment having a console positioned at an operator''s station, said equipment being provided with an open center hydraulic system including a pump, manifold, cylinders and sump for hydraulically controlling mechanisms on said equipment, the improvement comprising electrical means including switches positioned in said console for controlling said cylinders, said cylinders being connected to said mechanisms for three position control in extending a movable element of said cylinders, in holding the movable element of said cylinders or in retracting the movable element of said cylinders; said electrical means including sets of single and double acting solenoid valves positioned in said manifold and being connected to said switches and to said cylinders for providing said three position control; and a normally open solenoid valve is operatively interposed in said manifold between said pump and sump for permitting hydraulic fluid provided by said pump to pass through said manifold and return to said sump, and first and second ordinarily closed solenoid valves are positioned in said manifold between said pump and a selected hydraulic cylinder, said first valve functioning as a check valve and said second valve functioning as a flow control valve so that upon closing of selected switches on said console said normally open solenoid valve will be closed permitting buildup of hydraulic pressure in said manifold and with an opening of said first solenoid valve hydraulic fluid is supplied through said second solenoid valve for extending a selected cylinder.
Claim 2
Dependent Claim
244 words
In combination in self-propelled mobile equipment having a console positioned at an operator''s station, said equipment being provided with an open center hydraulic system including a pump, manifold, cylinders and sump for hydraulically controlling mechanisms on said equipment, the improvement comprising electrical means including switches positioned in said console for controlling said cylinders, said cylinders being connected to said mechanisms for three position control in extending a movable element of said cylinders, in holding the movable element of said cylinders or in retracting the movable element of said cylinders; said electrical means including sets of single and double acting solenoid valves positioned in said manifold and being connected to said switches and to said cylinders for providing said three position control; and a normally open solenoid valve is operatively interposed in said manifold between said pump and sump for permitting hydraulic fluid provided by said pump to pass through said manifold and return to said sump, and first and second ordinarily closed solenoid valves are positioned in said manifold between said pump and a selected hydraulic cylinder, said first valve functioning as a check valve and said second valve functioning as a flow control valve so that upon closing of selected switches on said console said normally open solenoid valve will be closed permitting buildup of hydraulic pressure in said manifold and with an opening of said first solenoid valve hydraulic fluid is supplied through said second solenoid valve for extending a selected cylinder.
Claim 3
Dependent Claim
64 words
The combination recited in claim 1 and wherein said first ordinarily closed solenoid valve is a check valve and said second solenoid valve is a flow control valve so that when said first valve is actuated to closed position hydraulic pressure will increase in said manifold until said flow control valve is overcome resulting in extension of the movable element of said selected cylinder.
Claim 4
Dependent Claim
76 words
The combination recited in claim 2 and wherein a plurality of lines are hydraulically connected between said manifold and said selected cylinder, first and second ordinarily closed solenoid valves are interposed in each of said lines between said manifold and said hydraulic cylinder, said first ordinarily closed solenoid valves being located adjacent to said manifold and being check valves, and said second ordinarily closed valves being located remote to said manifold and being flow control valves.
Claim 5
Dependent Claim
64 words
The combination recited in claim 2 and wherein one of said hydraulic cylinders is designed for operation at hydraulic pressure less than the normal pressure of said manifold, a relief valve positioned in a line between said solenoid valves and being set to reduce the pressure in said line to the lesser amount required by said cylinder connected to said one of said lines.
Claim 6
Dependent Claim
44 words
The combination recited in claim 3 and wherein two of said lines are connected to opposite ends of a two-way hydraulic cylinder, and an additional flow control valve is interposed in said two lines between said second solenoid valves and said two-way hydraulic cylinder.
Claim 7
Dependent Claim
112 words
The combination recited in claim 1 and wherein a pair of lines are hydraulically connected between said manifold and opposite ends of a two-way hydraulic cylinder, a first normally closed solenoid valve connected in each of said lines adjacent to said manifold and functioning as check valves, flow control valves positioned in said lines between said cylinder and said first solenoid valves, a pair of lines hydraulically connected to each Of said lines between said cylinder and said flow control valves and each of said pair including a normally closed solenoid check valve interposed between said flow control valves and sump for permitting two-way operation of the movable element of said cylinder.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |