Patent US3759332A successfully refreshed from Google Patents.
US3759332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extra heavy duty multi-disc harrow with automatic level control
Assignee: Individual
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Filing: 1970-12-09
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Granted: 1973-09-18
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Expires: 1990-12-09
Abstract
Abstract Agricultural machine adaptable for use as a multi-disc harrow having a longitudinally rigid, but transversely and diagonally flexible main frame assembled from prefabricated front, rear, left and right frame sections, each of which sections includes longitudinal and transverse components welded together. The front and rear sections are disposed between the left and right sections at the forward and rear ends thereof. The sections are joined together by bolts, instead of being welded to each other, to provide the aforesaid flexibility, while eliminating failure in materials and welded joints which would occur if the frame sections were welded together. The main frame assembly is supported by a retractable wheel carriage assembly wherein the wheels are adjustable to raise the frame for transport, or to control the depth of operation of the implements carried by the frame. A leveling mechanism is interposed between the carriage assembly and a draw bar connected to the front frame section and automatically functions to maintain the main frame level with the ground at all times.
Inventors
- 👤 J Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:54
CPC Classifications
A; A01; A01B; A01B63/00; A01B63/14; A01B63/16; A01B63/22; A01B21/00; A01B21/08; A01B21/083; A01B23/00; A01B23/04; A01B23/046
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
An implement frame construction, comprising: unitary front, rear, left side and right side frame sections, each of said frame sections including longitudinal and transverse components welded together, said front and rear frame sections being disposed between said left and right frame sections at the front and rear ends thereof and in longitUdinally spaced relation; means securing adjacent components of said frame sections together in assembled relation and providing for transverse and diagonal flexing of the assembled frame; a wheel carriage assembly comprising a main shaft, wheels and arms (142) interconnecting said wheels and said shaft; bearings rotatably mounting said shaft on the longitudinal components of said left and right frame sections; and gangs of harrow discs mounted upon said left and right frame sections fore and aft of said wheel carriage assembly.
Claim 2
Dependent Claim
132 words
An implement frame construction, comprising: unitary front, rear, left side and right side frame sections, each of said frame sections including longitudinal and transverse components welded together, said front and rear frame sections being disposed between said left and right frame sections at the front and rear ends thereof and in longitUdinally spaced relation; means securing adjacent components of said frame sections together in assembled relation and providing for transverse and diagonal flexing of the assembled frame; a wheel carriage assembly comprising a main shaft, wheels and arms (142) interconnecting said wheels and said shaft; bearings rotatably mounting said shaft on the longitudinal components of said left and right frame sections; and gangs of harrow discs mounted upon said left and right frame sections fore and aft of said wheel carriage assembly.
Claim 3
Dependent Claim
52 words
A frame construction as defined in claim 1, wherein the front frame section has a hydraulic cylinder pivotally mounted thereon; and wherein the shaft of the carriage assembly has a lever secured thereto; and wherein the hydraulic cylinder has a piston rod connected with said lever for angularly rotating the carriage shaft.
Claim 4
Dependent Claim
94 words
A frame construction as defined in claim 1, wherein the shaft has a pair of projections mounted thereon, one near each end, each of said projections having an opening; and wherein each of the side frame sections has a box-formation mounted on one of its longitudinal components to receive one of said projections; and wherein said box formations and said one longitudinal component having aligned openings for selectively receiving a pin to be passed through the opening in said projection for locking the wheel carriage assembly in position relative to said side frame sections.
Claim 5
Dependent Claim
19 words
A frame construction as defined in claim 3, including a draw bar pivotally connected to the front frame section.
Claim 6
Dependent Claim
53 words
A frame construction as defined in claim 4, including a leveling unit mounted upon the front frame section and interposed between the draw bar and the wheel carriage assembly for maintaining the main frame level with the ground at all times; and wherein the hydraulic cylinder is a component of the leveling unit.
Claim 7
Dependent Claim
190 words
In a harrow having a frame; a draw bar pivotally connected to said frame, front and rear gangs of harrow discs mounted on said frame, a wheel carriage assembly including a shaft and means pivotally mounting said shaft upon said frame between said front and rear gangs of harrow discs, said shaft having one end of a lever fixed thereto, the improvement comprising: a frame-leveling mechanism disposed between said lever and said draw bar, said frame-leveling mechanism including a hydraulic cylinder pivotally mounted at one end thereof on said frame and having a piston rod pivotally connected to said lever, and a linkage system pivotally connected at one end thereof to said lever and pivotally connected at its opposite end to said draw bar, said linkage system including a link and means directly connected to the draw bar at a point forwardly of the pivotal connection of said draw bar to said frame, a member connected with said link and being slidably mounted on said means, and compression springs positioned on said means on opposite sides of said slidable member tending to maintain the same in a position of equilibrium.
Claim 8
Dependent Claim
190 words
In a harrow having a frame; a draw bar pivotally connected to said frame, front and rear gangs of harrow discs mounted on said frame, a wheel carriage assembly including a shaft and means pivotally mounting said shaft upon said frame between said front and rear gangs of harrow discs, said shaft having one end of a lever fixed thereto, the improvement comprising: a frame-leveling mechanism disposed between said lever and said draw bar, said frame-leveling mechanism including a hydraulic cylinder pivotally mounted at one end thereof on said frame and having a piston rod pivotally connected to said lever, and a linkage system pivotally connected at one end thereof to said lever and pivotally connected at its opposite end to said draw bar, said linkage system including a link and means directly connected to the draw bar at a point forwardly of the pivotal connection of said draw bar to said frame, a member connected with said link and being slidably mounted on said means, and compression springs positioned on said means on opposite sides of said slidable member tending to maintain the same in a position of equilibrium.
Claim 9
Dependent Claim
193 words
A harrow as defined in claim 6, wherein the linkage system includes: links having one end thereof pivotally connected with the lever on the wheel carriage shaft; a fulcrum lever having one end thereof pivotally connected with the frame and having its opposite end connected with the other end of said links; a second pair of links having one end thereof pivotally connected with said fulcrum lever at substantially the mid point thereof; a pair of uprights secured to the frame; a bell crank pivotally mounted upon said uprights and having a rearwardly extending arm connected with the other end of said second pair of links, said bell crank having forwardly extending arms; a bar pivotally connected with the forwardly extending arms of said bell crank; a pair of threaded members extending through said bar; springs on said threaded members on opposite sides of said bar, adjusting nuts on said threaded member for adjusting said springs so that the compression therein is equal, to thereby maintain the Sliding bar in a position of equilibrium relative to said threaded members; and means connecting the draw bar with the lower end of said threaded members.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |