Harvesters – Gang
Reexamination Certificate
1999-06-09
2001-02-06
Shackelford, H. (Department: 3671)
Harvesters
Gang
C056S015500, C056S014900, C056S228000
Reexamination Certificate
active
06182427
ABSTRACT:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
FIELD OF THE INVENTION
The present invention relates broadly to a swing tongue crop harvester which operates in laterally offset positions relative to a towing tractor being advanced across a crop field and, more particularly, pertains to a mower conditioner having a driving arrangement for driving the cutting and conditioning components of the mower conditioner by means of a mechanical connection linking a power take-off shaft of the tractor with a gear box on the mower conditioner.
BACKGROUND OF THE INVENTION
Swing tongue, pull-type crop harvesters have gained widespread acceptance with farming personnel due to their capability to be controlled by the tractor operator to effectively steer or navigate through a variety of turns and maneuvers in a field with standing crops. With respect to center pivot swing tongue harvesters wherein the draw bar or tongue is pivotably connected adjacent the transverse center of the harvester, the machine has the ability to cut and/or condition crops as it is towed back and forth by the tractor across a field with the harvester swinging from one side of the tractor to the other during alternate runs. Harvesters of this type typically include a wheeled frame to which the tongue is connected, and a harvesting head pivotably mounted to the frame for movement about a horizontal axis between raised and lowered positions.
Swinging the crop harvester laterally from side-to-side behind the tractor, however, causes difficulties in the transmission of driving power from a power take-off shaft on the tractor to the cutting and conditioning components of the machine. One crop harvester of this type is disclosed in U.S. Pat. No. 4,858,418 issued Aug. 22, 1989. This patent discloses a mowing machine having an undercarriage frame and a crossbeam to which a plurality of cutting tools are mounted for rotation about vertical axes. Cutter blades are connected to the lower ends of the cutting tools. The cutting machine is connected to the tractor by means of a pivotable tractor hitch and the cutting tools are driven by a drive line interconnecting a power take-off shaft of the towing tractor and a gear box on the crossbeam. The drive line includes a fixed position shaft segment and a universally jointed telescopic drive shaft assembly. The gear box is pivotally connected on a middle part of the crossbeam and the drive line is connected with the gear box by means of a support joint having forked parts pivotally interconnected on a horizontal axis. In this arrangement, the forces necessary to steer or pivot the gear box are transmitted through the drive line to the forked support joint between the gear box and the drive line.
Another example of a swing-type crop harvester is disclosed in U.S. Pat. No. 5,272,859 issued Dec. 28, 1993. In this patent, a drive line from the power take-off shaft of the tractor extends along the tongue and is supported in underslung relationship so that the rear end of the drive line is coupled with the input shaft of the gear box which extends fore and aft. A conventional drive line shield surrounds the drive line to prevent entry of contaminants into the telescoping sections and to prevent accidental contact with the drive line. When the tongue is swung back and forth to reposition the harvesting portion of the machine, a telescoping section of the drive line between a supporting point on the tongue and the connection with the gear box telescopically extends and retracts to accommodate the different axes of rotation of the tongue and of the gear box. A telescoping steering linkage is connected between the tongue and the gear box to steer or pivot the gear box as the tongue is swung. This arrangement relieves steering forces on the drive line but adds to the time and cost of assembly due to the separate gear box steering mechanism.
Attempts have been made by the prior art to address the problems in transmitting power from the tractor to the cutting and conditioning components of the harvester by employing different structures to provide input power from the drive line to the gear box and to pivot or steer the gear box. It is an object of the present invention to provide a mechanical drive line connection and gear box steering structure which is capable of satisfying the power requirements of the harvester while minimizing the torsional loading on the telescopic drive line connection at its connection to the gear box. It is a further object of the invention to provide a power input and gear box steering structure which is simple in its design and construction.
BRIEF SUMMARY OF THE INVENTION
The present invention advantageously provides a tractor drawn, swing tongue crop harvester in which the cutting and conditioning components are driven by a unique mechanical drive line arrangement which operates to effectively steer the gear box for the harvester in the general direction of the tongue in a manner which will accommodate turning and other angular motion of the harvester, including movement of the head between its raised and lowered positions.
In one aspect of the invention, a pull-type harvesting machine adapted for laterally offset attachment to a tractor includes a frame, a harvesting head supported by the frame and including a cutting apparatus for cutting crops as the machine is towed across a field, and a gear box operably connected with the cutting apparatus. A pull tongue is pivotably coupled to the frame about a first vertical axis for varying the position of the machine relative to the tractor. A mechanical drive line extends along and is rotatably supported by the pull tongue for supplying driving power to the cutting apparatus through the gear box. The gear box is pivotally connected on the header about a second vertical axis spaced from the first vertical axis and the drive line includes a fixed position portion and a telescopic portion supported at fore and aft ends by the tongue and the gear box, respectively. A shielding arrangement surrounds the telescopic portion of the drive line and is interconnected with the gear box for steering the gear box in the general direction of the pull tongue. A bearing arrangement is disposed between the telescopic portion of the drive line and the shielding arrangement. The shielding arrangement has one end supported on the drive line and another end pivotally connected to the gear box. The shielding arrangement includes a first shield and a second shield telescopically mounted relative to the first shield. An end of one of the shields is supported by a bearing on the drive line, and an end of the other shield is pivotally attached about a horizontal axis to the gear box.
In the preferred embodiment, the shielding arrangement has an inner shield having a forward end and a rearward end, and an outer shield having a forward end and a rearward end, the outer shield being telescopically mounted on the inner shield. The drive line includes a surrounding hub, and a bearing is disposed between the forward end of the inner shield and the hub to allow rotation of the drive line relative to the inner shield. A CV joint connects a fixed position portion of the drive line with the telescopic portion of the drive line, and includes a jacket extending forwardly from the forward end of the inner shield. A first nylon bearing is disposed between an enlarged portion of the CV joint and the CV jacket, and a second nylon bearing is disposed between the hub and the jacket to allow rotation of the drive line relative to the jacket. The rearward end of the outer shield is pivotally attached to the gear box.
In a second embodiment of the invention, the shielding arrangement has an outer shield having a forward end and a rearward end and an inner shield having a forward end and a rearward end, the inner shield being slidably and telescopically mounted within the outer shield. The drive line includes a surrounding hub and a bearing is disposed between the forward end of the inner shield and the hub to allow rotation of the drive line
Andrus Sceales Starke & Sawall LLP
Gehl Company
Shackelford H.
LandOfFree
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