Conveyors: power-driven – Conveying apparatus entirely supported by mobile ground... – Condition responsive control means for vehicle or conveyor
Patent
1977-07-20
1980-06-10
Reeves, Robert B.
Conveyors: power-driven
Conveying apparatus entirely supported by mobile ground...
Condition responsive control means for vehicle or conveyor
198316, 198320, B65G 4300
Patent
active
042068398
ABSTRACT:
Lift apparatus is adapted for raising and lowering portable grain elevators and the like and includes both a power lift mechanism and an alternative manual lift mechanism. It also includes an upper limit stop for limiting the height to which the power lift mechanism can raise the elevator and a tie-down limit stop for tying the raised end of the elevator to an anchoring object for safety in addition to prohibiting the power lift mechanism from operating when the elevator is so anchored. In the disclosed embodiment, an elevator lift apparatus which includes a cable for drawing a front frame member toward a rear frame member to effect raising the rear end of a grain elevator is provided on one end with a power driven winch for drawing the cable to effect lifting, and it is also provided on its opposite end with a manual winch for also drawing the cable to effect lifting. A hydraulic fluid flow circuit is provided to supply the hydraulic motor with fluid, said circuit having an alternative one-way directional flow route for bypassing the hydraulic motor on the power lift mechanism. An upper limit stop means which is mechanically sensitive to the position of the lifting apparatus at the desired maximum limit of lifting range for actuating said valve to bypass the flow of hydraulic fluid around the hydraulic motor. A second alternative circuit is also provided to allow hydraulic fluid to flow in a reverse direction through the hydraulic motor to begin lowering the elevator to a position in which the valve is deactuated, restoring the system to the normal fluid flow route. The tie-down mechanism is also connected to the valve and has enough travel to actuate the valve to bypass the motor but is limited in travel such that the anchoring force is transferred to the upper end of the elevator for tie-down purposes. Alternative embodiments include free hanging weighted bodies to sense the maximum desired height to which the elevator is raised and to actuate the bypass valve mechanism.
REFERENCES:
patent: 1417096 (1922-05-01), Mueller
patent: 2615560 (1952-10-01), Robinson
patent: 2646157 (1953-07-01), Belt
patent: 2778477 (1957-01-01), Lundahl
patent: 2794538 (1957-06-01), Schenk
patent: 2964158 (1960-12-01), Wells
patent: 3092239 (1963-06-01), Mayrath
patent: 3153489 (1964-10-01), Leavengood et al.
patent: 4054213 (1972-10-01), Chever
Reeves Robert B.
Watts Douglas D.
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