Earth working – Plural wheeled implements – Outrigged implement adjustable inwardly
Patent
1975-09-18
1977-09-27
Marlo, George J.
Earth working
Plural wheeled implements
Outrigged implement adjustable inwardly
172456, 172458, 172459, 172468, 172482, 172583, A01B 4900, A01B 6332
Patent
active
040505235
ABSTRACT:
The invention provides a folding wing disc harrow wherein a hydraulic operating mechanism is provided for folding and unfolding the wings through an arc of more than 180.degree. through the positive bidirectional linear movement of the plunger of a double acting hydraulic cylinder cooperating with the wing to which it is connected, for said folding and unfolding operations, and which mechanism allows a limited angular free floating motion of the wing above and below the horizontal "unfolded" or "working" position when the hydraulic control valve is set accordingly. The connection of the hydraulic piston rod with the wing is so organized that the straight line motion of the piston rod is enabled to fold and unfold the wing through an arc well in excess of 180.degree. and is organized to allow a limited free floating action of the wing for following the soil surface variations.
The ability of the present invention to swing the wing through 180.degree. of angular motion for folding and unfolding the wings about a horizontal longitudinal hinge axis by a simple straight line hydraulic cylinder motor operation allows a uniquely compact and stable folded condition of the implement which is advantageous and highly desirable. Dispensing with the necessity for balancing springs, which is an undesirable feature common in the prior art, marks the present invention as a distinct advance in the art.
REFERENCES:
patent: 3692121 (1972-09-01), Kenney
patent: 3693724 (1972-09-01), Fueslein
patent: 3828860 (1974-08-01), Poland
patent: 3887016 (1975-06-01), Hansen
patent: 3944001 (1976-03-01), Warner
Chromalloy American Corporation
Marlo George J.
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