Earth working – Overload shifting – Against spring return device
Patent
1975-09-29
1976-09-21
Marlo, George J.
Earth working
Overload shifting
Against spring return device
172719, A01B 6104
Patent
active
039813673
ABSTRACT:
A self-restoring spring trip cultivator shank assembly adapted to be supported from a mounting bracket secured to the transverse tool bar of a ground-working agricultural implement. The lower end of the cultivator shank carries a ground-working tool and the forward end extends between a pair of laterally spaced side plates which are supported by the mounting bracket contiguous the under surface of the tool bar, the forward end of the cultivator shank being adapted to pivot about the peripheral surface of a pivot pin which extends between and through the laterally spaced side plates. An abutment member in the form of leaf spring which extends in overlying contacting engagement to the upper surface of the cultivator shank is suitably held against the forward end portion of the cultivator shank to maintain the cultivator shank in pivotal bearing relation against the peripheral surface of the pivot pin. A loading spring subassembly supported from the mounting bracket is adapted to engage the rearward end of the leaf spring whereby to transmit the spring loading force to the leaf spring and thus to the cultivator shank which is in underlying contacting relation to the leaf spring. When the tool carried by the lower end of the cultivator shank engages an obstacle such as a rock, the cultivator shank will pivot upwardly and forwardly about the pivot pin carried by the side plates, this movement of the cultivator shank causing compression of the loading or compression spring. When the earth-working tool has passed the obstacle, the loading spring will return the cultivator shank to a position in which the tool carried by the shank is again in proper earth-working position.
REFERENCES:
patent: 186803 (1877-01-01), Conaway
patent: 264319 (1882-09-01), Mendenhall
patent: 301545 (1884-07-01), Wheeler
patent: 530819 (1894-12-01), Baker
patent: 2906353 (1959-09-01), Rogers
patent: 3084749 (1963-04-01), Anderson
patent: 3098529 (1963-07-01), Wade et al.
patent: 3173494 (1965-03-01), Padwick
patent: 3700039 (1972-10-01), Essex
Allis-Chalmers Corporation
Marlo George J.
Sullivan Robert C.
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