Earth working – With actuator adapted to lift tool for transport on wheeled... – Tool rocked about independently vertically adjustable...
Patent
1975-06-04
1976-08-10
Shapiro, Paul E.
Earth working
With actuator adapted to lift tool for transport on wheeled...
Tool rocked about independently vertically adjustable...
172699, A01B 1308, A01B 6310, A01B 63102
Patent
active
039736326
ABSTRACT:
A scarifier or ripper attachment for a tractor or like vehicle, comprising a support structure carrying a pivoted arm on the free end of which is a pivoted tool-carrying frame. The elevation of the arm is controlled by an hydraulic elevation actuator and the inclination of the tool with respect to the arm is controlled by an hydraulic attitude control actuator. The hydraulic circuit of the two actuators includes an auxiliary distributor having three positions in one of which the two actuators are connected in series so that one retracts when the other extends, and in the other two of which one or the other actuator is isolated so that the other can be controlled independently. The relative diameters of the two actuators are such that in the first position of the auxiliary distributor the tool is held in a fixed orientation in relation to the ground as the arm is turned through its full angle.
REFERENCES:
patent: 3269464 (1966-08-01), Smelcer
patent: 3752239 (1973-08-01), Kelly
patent: 3807508 (1974-04-01), Kelly
patent: 3831684 (1974-08-01), Thigpen
patent: 3887015 (1975-06-01), Kelly
patent: 3901328 (1975-08-01), Stanfield
Gimac S.p.A.
Shapiro Paul E.
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