Presses – Reciprocating press construction – Fluid pressure actuation
Patent
1976-10-08
1977-11-08
Oresky, Lawrence J.
Presses
Reciprocating press construction
Fluid pressure actuation
100 50, 100295, 214 82, 214 833, B65F 302
Patent
active
040571572
ABSTRACT:
A load compacting and ejecting mechanism for a refuse truck having an open rectangular body and an openable tailgate. An ejector plate extends across the body and is mounted for movement from front to back through the body. The ejector plate has a centrally located compaction plate which is mounted on the ejector plate structure for movement between a front position in which it constitutes a part of the rear face of the ejector plate and a second position rearwardly of the rear face of the ejector plate. A main hydraulic cylinder means extends between and is connected to the front of the body and to the compaction plate. A second hydraulic cylinder means is connected between the main structure of the ejector plate and the compaction plate. A first hydraulic circuit connects the opposite ends of the first cylinder means to a source of hydraulic fluid and includes a control valve for alternatively extending and retracting the main cylinder. A second hydraulic circuit connects the base and rod ends of the second cylinder to each other through a pair of one-way valves which are parallel to each other in the second circuit. The first one-way valve freely allows fluid flow from the base end to the rod end of the second cylinder means. The second one-way valve is connected by an actuating line to the base end of the main cylinder and is pressure responsive for allowing the flow of fluid from the rod end to the base end of the second cylinder means when the resistance to rearward movement of the ejector plate and compaction plate reaches a pre-determined level whereby continued extension of the main cylinder moves the compaction plate rearwardly of the ejector plate.
REFERENCES:
patent: 2912128 (1959-11-01), Kamin
patent: 3384007 (1968-05-01), Boje et al.
patent: 3621775 (1971-11-01), Dedio et al.
patent: 3865260 (1975-02-01), Wieschel et al.
patent: 3988979 (1976-11-01), Smith
Herpich William A.
Park Glenn S.
Leonard Henry K.
Oresky Lawrence J.
Peabody International Corporation
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