Earth working – Overload shifting
Patent
1978-05-02
1981-02-10
Johnson, Richard J.
Earth working
Overload shifting
172699, 188316, A01B 1308, A01B 6104
Patent
active
042496144
ABSTRACT:
An implement has subsoil tines interconnected to a beam of the frame. At least one of the tines has an upper fastening portion pivoted to a beam of the frame. An overload device also interconnects the fastening portion to the beam so that upon overload on the tine, the device can trip and release the tine for pivotal movement, out of operative position to avoid damage. The device is a hydraulic circuit in which a piston in a cylinder holds the tine in place. A relief valve in the circuit allows escape of fluid from one side of the piston to a reservoir so that the piston and cylinder can move relative to each other upon overload. A spring, either within the cylinder or otherwise associated with the piston, biases the tine to return in operative position. A part of the circuit has a further valve that permits fluid return. The relief valve is held by a spring and screw knob to vary overload pressure of the fluid.
REFERENCES:
patent: 2228865 (1941-01-01), Bird
patent: 3321031 (1967-05-01), Evans
patent: 3376958 (1968-04-01), Carr
patent: 3539229 (1970-11-01), Scully
patent: 3642074 (1972-02-01), Geurts
patent: 3733107 (1973-05-01), Cote
patent: 3752092 (1973-08-01), Vinyard
patent: 3760882 (1973-09-01), Geurts
patent: 3929057 (1975-12-01), Kondo
Johnson Richard J.
Mason William B.
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