US3714767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crop harvester
Assignee: Deere and Co
•
Filing: 1971-06-09
•
Granted: 1973-02-06
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Expires: 1991-06-09
Abstract
Abstract A hydraulically-operated vertical positioning mechanism for a crop harvester that is pivotally mounted on a frame for vertical swinging movement comprising a pair of rigidly-joined and axially-aligned pistons and cylinders that extend between the frame and unit, a ground feeler on the unit operates a valve for one of the pistons and cylinders and a linkage connected to the piston and cylinder and responsive to adjustment of the latter operates a control valve for the other piston and cylinder.
Inventors
- 👤 A Hubbard
- 👤 L Sanderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:47
CPC Classifications
A; A01; A01D; A01D41/00; A01D41/12; A01D41/14; A01D41/141; A01D46/00; A01D46/08; Y; Y10; Y10S; Y10S56/00; Y10S56/15
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
229 words
A positioning mechanism for a fore-and-aft elongated crop harvester in which the harvester has its rear portion pivotally mounted on a mobile support, said positioning mechanism comprising: a hydraulic piston and cylinder assembly extending between the frame and harvester and composed of a pair of rigidly joined and axially aligned first and second cylinders and pistons shiftable within the cylinders and having piston rods extending out of the cylinders to ends connected to the frame and harvester respectively, said first cylinder and its piston and said second cylinder and its piston being in low and high capacity respectively; a first valve connected to and for shifting the first cylinder on its respective piston; a main valve connected to and for shifting the piston with respect to the second cylinder; a ground surface feeler supported on the harvester for vertical movement and for shifting vertically with respect to the harvester in accordance with the rise and fall of the surface level; a connection between the feeler and first valve for adjusting the latter to thereby extend and retract the first cylinder on its piston in accordance with the rise and fall of the ground surface; a linkage connection between the piston and cylinder assembly and said main valve for adjusting the main valve and responsive to shifting of the first cylinder on its respective piston to shift the main valve.
Claim 2
Dependent Claim
229 words
A positioning mechanism for a fore-and-aft elongated crop harvester in which the harvester has its rear portion pivotally mounted on a mobile support, said positioning mechanism comprising: a hydraulic piston and cylinder assembly extending between the frame and harvester and composed of a pair of rigidly joined and axially aligned first and second cylinders and pistons shiftable within the cylinders and having piston rods extending out of the cylinders to ends connected to the frame and harvester respectively, said first cylinder and its piston and said second cylinder and its piston being in low and high capacity respectively; a first valve connected to and for shifting the first cylinder on its respective piston; a main valve connected to and for shifting the piston with respect to the second cylinder; a ground surface feeler supported on the harvester for vertical movement and for shifting vertically with respect to the harvester in accordance with the rise and fall of the surface level; a connection between the feeler and first valve for adjusting the latter to thereby extend and retract the first cylinder on its piston in accordance with the rise and fall of the ground surface; a linkage connection between the piston and cylinder assembly and said main valve for adjusting the main valve and responsive to shifting of the first cylinder on its respective piston to shift the main valve.
Claim 3
Dependent Claim
229 words
A positioning mechanism for a fore-and-aft elongated crop harvester in which the harvester has its rear portion pivotally mounted on a mobile support, said positioning mechanism comprising: a hydraulic piston and cylinder assembly extending between the frame and harvester and composed of a pair of rigidly joined and axially aligned first and second cylinders and pistons shiftable within the cylinders and having piston rods extending out of the cylinders to ends connected to the frame and harvester respectively, said first cylinder and its piston and said second cylinder and its piston being in low and high capacity respectively; a first valve connected to and for shifting the first cylinder on its respective piston; a main valve connected to and for shifting the piston with respect to the second cylinder; a ground surface feeler supported on the harvester for vertical movement and for shifting vertically with respect to the harvester in accordance with the rise and fall of the surface level; a connection between the feeler and first valve for adjusting the latter to thereby extend and retract the first cylinder on its piston in accordance with the rise and fall of the ground surface; a linkage connection between the piston and cylinder assembly and said main valve for adjusting the main valve and responsive to shifting of the first cylinder on its respective piston to shift the main valve.
Claim 4
Dependent Claim
229 words
A positioning mechanism for a fore-and-aft elongated crop harvester in which the harvester has its rear portion pivotally mounted on a mobile support, said positioning mechanism comprising: a hydraulic piston and cylinder assembly extending between the frame and harvester and composed of a pair of rigidly joined and axially aligned first and second cylinders and pistons shiftable within the cylinders and having piston rods extending out of the cylinders to ends connected to the frame and harvester respectively, said first cylinder and its piston and said second cylinder and its piston being in low and high capacity respectively; a first valve connected to and for shifting the first cylinder on its respective piston; a main valve connected to and for shifting the piston with respect to the second cylinder; a ground surface feeler supported on the harvester for vertical movement and for shifting vertically with respect to the harvester in accordance with the rise and fall of the surface level; a connection between the feeler and first valve for adjusting the latter to thereby extend and retract the first cylinder on its piston in accordance with the rise and fall of the ground surface; a linkage connection between the piston and cylinder assembly and said main valve for adjusting the main valve and responsive to shifting of the first cylinder on its respective piston to shift the main valve.
Claim 5
Dependent Claim
32 words
The structure as set forth in claim 1 in which the linkage has lost motion therein to permit limited movement of the first cylinder on its piston without adjusting the main valve.
Claim 6
Dependent Claim
35 words
The structure as set forth in claim 1 in which the cylinder assembly has surface protrusions on at least one of its cylinders and the linkage extends to and is operatively connected to the protrusion.
Claim 7
Dependent Claim
33 words
The structure as set forth in claim 1 in which the first and second cylinders are end-to-end and rigidly joined and said first cylinder is considerably larger in diameter than said second cylinder.
Claim 8
Dependent Claim
19 words
The structure as set forth in claim 1 further characterized by a manually-controlled override means for said first valve.
Claim 9
Dependent Claim
194 words
A positioning mechanism for a fore-and-aft elongated crop harvester in which the harvester has its rear portion pivotally mounted on a mobile support, said positioning mechanism comprising: a hydraulic piston and cylinder assembly extending between the frame and harvester and composed of a pair of low and high capacity rigidly joined and axially aligned first and second cylinders and pistons shiftable within the cylinders and having piston rods extending out of the cylinders To ends connected to the frame and harvester respectively; first valve means connected to and for shifting the first cylinder on its respective piston; a main valve connected to and for shifting the piston with respect to the second cylinder; a ground surface feeler supported on the harvester for vertical movement and connected to the first valve for adjusting the latter to thereby extend and retract the first cylinder on its piston in accordance with the rise and fall of the ground surface; a connection between the piston and cylinder assembly and said main valve for adjusting the main valve and responsive to shifting of the first cylinder on its respective piston beyond a given range to shift the main valve.
Claim 10
Dependent Claim
194 words
A positioning mechanism for a fore-and-aft elongated crop harvester in which the harvester has its rear portion pivotally mounted on a mobile support, said positioning mechanism comprising: a hydraulic piston and cylinder assembly extending between the frame and harvester and composed of a pair of low and high capacity rigidly joined and axially aligned first and second cylinders and pistons shiftable within the cylinders and having piston rods extending out of the cylinders To ends connected to the frame and harvester respectively; first valve means connected to and for shifting the first cylinder on its respective piston; a main valve connected to and for shifting the piston with respect to the second cylinder; a ground surface feeler supported on the harvester for vertical movement and connected to the first valve for adjusting the latter to thereby extend and retract the first cylinder on its piston in accordance with the rise and fall of the ground surface; a connection between the piston and cylinder assembly and said main valve for adjusting the main valve and responsive to shifting of the first cylinder on its respective piston beyond a given range to shift the main valve.
References Cited (Backward Citations)
US3196599A
Cited
US3402540A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |