US3603066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Header control for a harvester
Assignee: Deere and Co
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Filing: 1970-02-09
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Granted: 1971-09-07
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Expires: 1990-02-09
Abstract
Abstract A self-propelled windrower has a forwardly disposed transversely elongated header mounted on the main frame of the windrower for independent vertical adjustment of the opposite ends of the header. The position of the opposite ends of the header are respectively controlled by a pair of hydraulic cylinders operative between the main frame and the header at transversely spaced points, one of said cylinders being a master cylinder and the other being a slave cylinder. Both cylinders are simultaneously actuated through a first control valve, which controls the fluid pressure supplied to the master cylinder, so that the opposite ends of the header move in unison, while the header is tilted by actuating a second control valve, which adds or subtracts fluid from the slave cylinder only to raise or lower one side of the header relative to the other.
Inventors
- 👤 Donald E Burrough
- 👤 Joe Paul Leinhauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:46
CPC Classifications
A; A01; A01D; A01D41/00; A01D41/12; A01D41/14; A01D41/145; A01D34/00; A01D34/01; A01D34/02; A01D34/24; A01D34/246
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
245 words
In a self-propelled agricultural machine having a mobile main frame, a forward, transversely elongated agricultural tool having first and second opposite end portions and means mounting the tool on the frame for generally vertical adjustment of the opposite end portions of the tool on the frame separately or in unison, the improvement comprising: a source of fluid pressure on the main frame; a master and a slave hydraulic cylinder respectively operative between the agricultural tool and the frame at transversely spaced points for respectively vertically adjusting the first and second opposite end portions of the tool, said master hydraulic cylinder having inlet and outlet ends and said slave cylinder having an inlet end; hydraulic conduit means connecting the outlet end of the master hydraulic cylinder to the inlet end of the slave hydraulic cylinder; a first control valve means operativeLy connected to the source of fluid pressure and to the inlet end of the master hydraulic cylinder and selectively actuatable to supply fluid pressure thereto or exhaust fluid pressure therefrom to respectively raise and lower the first and second opposite end portions of the tool in unison; and a second control valve means operatively connected to a source of fluid pressure and to the inlet end of the slave hydraulic cylinder and selectively actuatable to supply fluid pressure thereto or exhaust fluid pressure therefrom to respectively raise or lower the second end portion of the tool independently of and relative to the first end portion.
Claim 2
Dependent Claim
245 words
In a self-propelled agricultural machine having a mobile main frame, a forward, transversely elongated agricultural tool having first and second opposite end portions and means mounting the tool on the frame for generally vertical adjustment of the opposite end portions of the tool on the frame separately or in unison, the improvement comprising: a source of fluid pressure on the main frame; a master and a slave hydraulic cylinder respectively operative between the agricultural tool and the frame at transversely spaced points for respectively vertically adjusting the first and second opposite end portions of the tool, said master hydraulic cylinder having inlet and outlet ends and said slave cylinder having an inlet end; hydraulic conduit means connecting the outlet end of the master hydraulic cylinder to the inlet end of the slave hydraulic cylinder; a first control valve means operativeLy connected to the source of fluid pressure and to the inlet end of the master hydraulic cylinder and selectively actuatable to supply fluid pressure thereto or exhaust fluid pressure therefrom to respectively raise and lower the first and second opposite end portions of the tool in unison; and a second control valve means operatively connected to a source of fluid pressure and to the inlet end of the slave hydraulic cylinder and selectively actuatable to supply fluid pressure thereto or exhaust fluid pressure therefrom to respectively raise or lower the second end portion of the tool independently of and relative to the first end portion.
Claim 3
Dependent Claim
23 words
The invention defined in claim 1 wherein the agricultural machine is a harvesting machine and the tool comprises a transversely elongated harvesting header.
Claim 4
Dependent Claim
60 words
The invention defined in claim 2 wherein the effective cross section of the outlet end of the master hydraulic cylinder equals the effective cross section of the inlet end of the slave hydraulic cylinder so that the first and second end portions of the header raise and lower at the same rate when the first control valve means is actuated.
Claim 5
Dependent Claim
33 words
The invention defined in claim 3 wherein the harvesting machine comprises a windrower having a hydrostatic drive means, and the fluid pressure source comprises a charge pump means in said hydrostatic drive means.
Claim 6
Dependent Claim
57 words
The invention defined in claim 4 wherein the hydrostatic drive means includes first and second hydrostatic drive units, and the charge pump means comprises first and second charge pumps respectively disposed in the first and second hydrostatic drive units, the first and second control valve means being respectively connected to the first and the second charge pumps.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |