US3736737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for raising and lowering the cutter mechanism of harvesters
Assignee: Individual
•
Filing: 1971-05-21
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Granted: 1973-06-05
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Expires: 1991-05-21
Abstract
Abstract A hydraulic control device for raising and lowering the cutter mechanism of a harvester, for example a combine harvester, which device is operable by manual actuation and by the hydraulic pressure in a displacement cylinder of the cutter mechanism through a control cylinder acting against a counterforce, and which device is for installation on a part of the combine harvester, preferably the drivers platform, which constitutes a stationary part as opposed to the movable cutter mechanism, wherein the arrangement of the actuating lever of the ''''raise'''' valve and/or the ''''lower'''' valve relative to the control cylinder, which acts directly or through intermediate links, depends on the position of the cutter mechanism, and this arrangement is variable with reference to the position of the cutter mechanism for adjusting the required working position of the cutter mechanism.
Inventors
- 👤 G Ii Schumacher
- 👤 G Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:38
CPC Classifications
A; A01; A01D; A01D34/00; A01D34/01; A01D34/02; A01D34/24; A01D34/246; A01D41/00; A01D41/12; A01D41/14; A01D41/141; Y; Y10; Y10S; Y10S56/00; Y10S56/15
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
323 words
In a harvester, cutter means normally operating with part of its weight resting on the ground, hydraulic displacement means operatively connecTed with said cutter means for raising and lowering the same, said hydraulic displacement means including piston and cylinder members one of which is movable relative to the other during raising and lowering of said cutter means by said displacement means, and said movable member of said displacement means responding to ground elevations or depressions engaged by said cutter means for automatically changing the hydraulic pressure in said displacement means, hydraulic control means communicating with said displacement means and maintained at the same pressure as said displacement means, said hydraulic control means also including piston and cylinder members one of which is movable relative to the other, said movable member of said hydraulic control means moving when said movable member of said displacement means moves, lowering valve means hydraulically connected with said cylinder member of said displacement means for actuating the latter to lower said cutter means and raising valve means hydraulically connected with said cylinder member of said displacement means for actuating the latter to raise said cutter means, said lowering valve means and said raising valve means being spaced from each other, valve-actuating means movable along a path between said lowering valve means and said raising valve means for moving in one direction to actuate said lowering valve means and in an opposite direction to actuate said raising valve means, said hydraulic control means being operatively connected with said valve actuating means for automatically operating the latter to actuate said lowering valve means when said cutter means encounters a depression in the ground and said raising valve means when said cutter means engages an elevation in the ground, and selecting means operatively connected with said valve-actuating means for operating the latter to actuate one or the other of said valve means for situating said cutter means at a selected operating elevation.
Claim 2
Dependent Claim
323 words
In a harvester, cutter means normally operating with part of its weight resting on the ground, hydraulic displacement means operatively connecTed with said cutter means for raising and lowering the same, said hydraulic displacement means including piston and cylinder members one of which is movable relative to the other during raising and lowering of said cutter means by said displacement means, and said movable member of said displacement means responding to ground elevations or depressions engaged by said cutter means for automatically changing the hydraulic pressure in said displacement means, hydraulic control means communicating with said displacement means and maintained at the same pressure as said displacement means, said hydraulic control means also including piston and cylinder members one of which is movable relative to the other, said movable member of said hydraulic control means moving when said movable member of said displacement means moves, lowering valve means hydraulically connected with said cylinder member of said displacement means for actuating the latter to lower said cutter means and raising valve means hydraulically connected with said cylinder member of said displacement means for actuating the latter to raise said cutter means, said lowering valve means and said raising valve means being spaced from each other, valve-actuating means movable along a path between said lowering valve means and said raising valve means for moving in one direction to actuate said lowering valve means and in an opposite direction to actuate said raising valve means, said hydraulic control means being operatively connected with said valve actuating means for automatically operating the latter to actuate said lowering valve means when said cutter means encounters a depression in the ground and said raising valve means when said cutter means engages an elevation in the ground, and selecting means operatively connected with said valve-actuating means for operating the latter to actuate one or the other of said valve means for situating said cutter means at a selected operating elevation.
Claim 3
Dependent Claim
69 words
The combination of claim 1 and wherein a second selecting means is operatively connected with said valve-actuating means for operating the latter to actuate said raising valve means or said lowering valve means independently of said first-mentioned selecting means, said second selecting means having a neutral position releasing said valve-actuating means to operate automatically for returning said cutter means to the operating elevation selected by said first-mentioned selecting means.
Claim 4
Dependent Claim
120 words
The combination of claim 1 and wherein said valve-actuating means includes a rod, a sleeve slidable along said rod, and means carried by said sleeve for actuating said lowering valve means when said sleeve moves in one direction along said rod and said raising valve means when said sleeve moves in an opposite direction along said rod, spring means situated between said sleeve and said movable member of said hydraulic control means for transmitting the movement between said movable member of said hydraulic control means and said sleeve for providing automatic operation of said valve-actuating means, and a motion-transmitting means connected between said selecting means and said sleeve for shifting the latter in response to operation of said selecting means.
Claim 5
Dependent Claim
82 words
The combination of claim 3 and wherein said means carried by said sleeve for actuating said lowering valve means and said raising valve means includes a collar fixed to said sleeve, said lowering valve means having an operating lever situated in the path of movement of said collar to be actuated thereby, and a toggle-lever mechanism connected between said sleeve and said raising valve means for operating said raising valve means upon displacement of said toggle-lever mechanism through a dead center position.
References Cited (Backward Citations)
US3568420A
Cited
US3509701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |