Harvesters – Motorized harvester – Having driven means for handling or treating crop
Patent
1995-03-13
1996-07-02
Melius, Terry Lee
Harvesters
Motorized harvester
Having driven means for handling or treating crop
56 102J, 56DIG1, A01D 8200
Patent
active
055310621
ABSTRACT:
A mower conditioner includes parallel upper and lower conditioning rolls with the upper roll having opposite ends respectively rotatably mounted in a pair of vertically swingable arms and thereby being moveable toward and away from the lower roll. Associated with each arm is a tensioning mechanism including a lever having its lower end pivotally mounted at a location just below a lower forward location of the upper roll when the latter is in a lowermost initial position. A rearwardly acting biasing element is attached to the upper end of the lever for yieldably urging the latter rearwardly. Mounted to the lever between its upper and lower ends is a cam follower which is located in contact with a cam mounted to the forward end of the roll support arm. The geometrical relationship between the follower and first and second contact surfaces of the cam is such that, as the upper roll is forced upward away from the lower roll in increasing amounts in a normal range of movement by crop material or foreign objects passing between the rolls, the follower will be in contact with the first contact surface and the biasing element will be increasingly loaded so as to resist such movement of the upper roll and such as to increase the pressure exerted by the crop material or foreign object on the rolls; and such that, as the upper roll is forced upward into an abnormal range of movement beyond the normal range, the follower will be in contact with the second contact surface and little or no increase in the load exerted by the biasing element and little or no increase in the pressure acting between the rolls will be experienced.
REFERENCES:
patent: 3820311 (1974-06-01), Sawyer et al.
patent: 4843804 (1989-07-01), Wellman
patent: 4850183 (1989-07-01), Fox
patent: 4961303 (1990-10-01), McCarty et al.
patent: 5033257 (1991-07-01), Walters
Deere & Company
Melius Terry Lee
LandOfFree
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