Folding tool bar for agricultural implements

Details Folding tool bar for agricultural implements Folding tool bar for agricultural implements

1976-01-19

1977-09-06

Johnson, Richard J.

Earth working

With actuator adapted to lift tool for transport on wheeled...

Central group liftable vertically, side groups movable inwardly

172657, A01B 1514

Patent

active

040462030

ABSTRACT:
A folding sectional tool bar for agricultural implements and including a hollow horizontal main section and wing sections hingedly connected thereto for independent movement between lowered operative positions and raised inoperative over-center parked positions. An articulated actuating linkage mechanism for each wing section embodies a hydraulic cylinder wholly positioned within the main section and having a plunger operatively connected to a crank arm on the adjacent wing section by means of a draw link which functions initially as the plunger is extended to engage the crank arm and transmit torque to the latter so as to raise the wing section by a powerful leverage action, and which subsequently functions, as the plunger continues to be extended, to move away from the crank arm and act in tension and transmit the necessary torque to raise the wing section and force it over to its parked position. The torque-applying draw link carries latch finger which can cooperate with a latch block on the main tool bar section to lock the wing section in its operative horizontal position. A floating link extends between the crank arm and plunger and supports the cylinder in an elevated position when the wing section is fully raised in order that upon retraction of the plunger for wing lowering purposes the draw link will not assume an improper over-center position when the plunger commences its retraction. Two slightly different forms of articulated linkage mechanisms which operate upon the same principle are disclosed, and a modified form of tool bar having a flexible central main section consistent with such two forms of linkage mechanisms is also disclosed.

REFERENCES:
patent: 1805588 (1931-05-01), Manley
patent: 3741312 (1973-06-01), Hayter
patent: 3774693 (1973-11-01), Orthman
patent: 3941194 (1976-03-01), Orthman

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