Tractor power lift mechanisms

Details Tractor power lift mechanisms Tractor power lift mechanisms

1980-06-09

1982-06-01

Spiegel, H. Jay

Valves and valve actuation

Mechanical movement actuator

Lever

251245, 91444, F16K 3144

Patent

active

043322859

ABSTRACT:
A tractor hydraulic power lift mechanism has a known manually adjustable flow control valve for regulating the rate of lowering an implement. However, when the valve is so adjusted that a heavy ground-working implement is lowered to ground level at a rate slow enough not to cause damage, the implement is then very slow to penetrate the ground to the desired working depth. A manually operable overriding mechanism preferably actuated by the main hand lever of the power lift mechanism is therefore provided to enable the valve to be moved temporarily into its fully open position and allowed to return to its adjusted position. The overriding mechanism is operated as the implement reaches ground level and released when it reaches its working depth.

REFERENCES:
patent: 1825864 (1931-10-01), Harter
patent: 3315751 (1967-04-01), Hull et al.
patent: 3734125 (1973-05-01), Bruce et al.
patent: 3978666 (1976-09-01), Kelly et al.
patent: 4204460 (1980-05-01), Andersen et al.
patent: 4218957 (1980-08-01), Underwood

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