US 4,057,157 A · Load compacting and ejecting mechanism for a refuse truck

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.

Claims10

Dependent claims

A load compacting and ejecting mechanism for a refuse truck that has a hollow rectangular body, an openable tailgate at the rear of the body and a refuse receiving opening near the front of the body, said mechanism comprising, in combination:

a. a generally vertical ejector plate which extends across said body and is guided for movement between the front and rear of said body,
b. a centrally located compaction plate mounted on said ejector plate for movement between a forward position in which it constitutes a part of the ejector plate surface and a position rearwardly of the surface of said ejector plate,
c. main hydraulic cylinder means connected between the front of said body and the structure of said compaction plate for moving said ejector and compaction plates through said body,
d. second hydraulic cylinder means connected between the structure of said ejector plate and said compaction plate for controlling the movement of said compaction plate relative to said ejector plate,
e. a hydraulic fluid circuit including a source of hydraulic fluid under pressure and a control valve for alternatively connecting said source to the base and rod ends of said main cylinder,
f. a second hydraulic fluid circuit connecting the base and rod ends of said second cylinder means through a pair of oppositely effective one-way valves connected in parallel in said second circuit,
1. the first of said one-way valves providing for fluid flow from the base end to the rod end of said second cylinder means,
2.

5 more elements

Mechanism for further densifying refuse that has been initially compacted by a main hydraulically powered cylinder which moves an ejector plate rearwardly for compacting refuse against the closed tailgate of a rectangular refuse truck body, said mechanism comprising, in combination:

a. a compaction plate mounted on and carried with said ejector plate for movement between a retracted position in which it constitutes a part of the refuse contacting face of said ejector plate and an extended position rearwardly of such face,
b. a second hydraulic cylinder means mechanically connected between the structure of said ejector plate and said compaction plate,
c. means connecting one end of said main hydraulic cylinder to said compaction plate,
d. plural valve means providing for flow of hydraulic fluid from the base end of said second hydraulic cylinder means to the rod end thereof, and
e. means responsive to a predetermined pressure in the base end of said main cylinder providing for flow of fluid from the rod end of said second hydraulic cylinder means to the base end thereof, whereby the second hydraulic cylinder means and said plural valve means locks said second hydraulic cylinder until said predetermined pressure has been reached and then unlocks said second hydraulic cylinder, and further allows retraction of said second hydraulic cylinder upon retraction of said main cylinder.

2 more elements

Dependencies are inferred from the claim text.

Load compacting and ejecting mechanism for a refuse truck

Life of this patent

Load compacting and ejecting mechanism for a refuse truck

Life of this patent

Abstract

Claims10