Material or article handling – Self-loading or unloading vehicles – Conveyor
Patent
1989-03-13
1991-05-14
Skaggs, H. Grant
Material or article handling
Self-loading or unloading vehicles
Conveyor
41452552, 4145255, 41452554, B60P 100
Patent
active
050151444
ABSTRACT:
A fluid pressure system comprises first and second members each movable in response to fluid pressure to individually exert a force. A linkage arrangement couples the first member with the second member for moving the second member in response to movement of the first member, and vice versa. Fluid pressure is conveyed to the first and second members at a pressure that varies according to the work load encountered by the first and second members in response to a control mechanism. The contro mechanism includes a first sensor that senses the variable fluid pressure and a first valve associated with the first sensor. The first valve is operative, when the sensed fluid pressure is less than a predetermined threshold value, for opening the conveyance of fluid pressure to the first member while closing the conveyance of fluid pressure to the second member so that, as the first and second members move together, only the first member exerts a force. The first valve is further operative, when the sensed fluid pressure equals or exceeds the threshold value, for opening the conveyance of fluid pressure to both the first and second members so that, as the first and second members move together, both the first and second members individually exert a force. An apparatus for loading materials from a hopper into a storage container employing the above-described fluid pressure delivery system is also provided.
REFERENCES:
patent: 4034563 (1977-07-01), Orth
patent: 4180365 (1979-12-01), Herpich et al.
patent: 4337620 (1982-07-01), Johnson
patent: 4522551 (1985-06-01), Henneberry
patent: 4833971 (1989-05-01), Kubik
Trade Brochure (1961) entitled "Daybrook Speedlift Power Packer".
Trade Brochure (1962) entitled "E-Z Pack Rear End Loader".
Smith Fred P.
Smith Fred T.
Dixon Keith L.
Puerner Paul R.
Skaggs H. Grant
The Heil Co.
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