US 4,860,646 AGranted

Compactor with hydraulic dwell and method

AssigneeMarathon Corporation

InventorKent Spiers

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Abstract

A compactor includes a longitudinally extending ground supported frame having an open end and a closed end. A cylinder and piston assembly is positioned within the frame and extends longitudinally therealong and a ram is secured to the piston for transferring waste through the open end. The cylinder has fluid ports at opposite ends thereof. An hydraulic fluid supply assembly introduces pressurized fluid to said ports for causing selective movement of the piston relative to the cylinder. An hydraulic spool valve is carried by the piston for permitting fluid to flow between the ports and for thereby preventing displacement of the piston when the dwell assembly engages one of the ends.

Claims14

Dependent claims

A compactor, comprising:

(a) a longitudinally extending ground supported frame assembly with an open end and a closed end;
(b) an hydraulic motor means including a cylinder means and piston means, said motor means having one of said cylinder means and piston means connected with said closed end and said motor means extending longitudinally toward said open end;
(c) a compactor ram connected with the other one of said cylinder means and piston means for transferring waste through said open end and said other one of said cylinder means and piston means being movable relative to said one of said cylinder means and piston means;
(d) said cylinder means including first and second fluid ports at opposite first and second ends thereof;
(e) hydraulic fluid supply means are in fluid communication with said ports for directing pressurized fluid therebetween for causing selective movement of said other one of said cylinder means and piston means and thereby of said ram;
(f) hydraulic dwell means carried by said piston means for permitting fluid to flow between said ports for preventing displacement of said other one of said cylinder means and piston means when said dwell means engages one of said cylinder ends;
(g) said dwell means including a spool assembly displaceable with and selectively displaceable relative to said piston means and including a dwell portion disposed between first and second land portions, each of said land portions engageable with an associated one of said cylinder means ends for permitting relative displacement of said dwell means with said piston means;
(h) said piston means including fluid port means communicable with said dwell portion when one of said land means engages one of said cylinder means ends for permitting fluid to flow between said ports and through said dwell portion;
(i) a continuous diameter aperture extends through said piston means;
(j) said dwell means is positioned within said aperture and said land portions have a common continuous diameter substantially equal to said aperture diameter;
(k) said aperture extends generally parallel to said cylinder means;
and,
(l) first and second fluid ducts are disposed in said piston means, each duct has a first opening in a wall of said piston means and a second opening communicating with said aperture for permitting fluid flow to be selectively established between said ports.

10 more elements

Dependencies are inferred from the claim text.

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Abstract

A compactor, comprising:

(a) a longitudinally extending ground supported frame assembly with an open end and a closed end;
(b) an hydraulic motor means including a cylinder means and piston means, said motor means having one of said cylinder means and piston means connected with said closed end and said motor means extending longitudinally toward said open end;
(c) a compactor ram connected with the other one of said cylinder means and piston means for transferring waste through said open end and said other one of said cylinder means and piston means being movable relative to said one of said cylinder means and piston means;
(d) said cylinder means including first and second fluid ports at opposite first and second ends thereof;
(e) hydraulic fluid supply means are in fluid communication with said ports for directing pressurized fluid therebetween for causing selective movement of said other one of said cylinder means and piston means and thereby of said ram;
(f) hydraulic dwell means carried by said piston means for permitting fluid to flow between said ports for preventing displacement of said other one of said cylinder means and piston means when said dwell means engages one of said cylinder ends;
(g) said dwell means including a spool assembly displaceable with and selectively displaceable relative to said piston means and including a dwell portion disposed between first and second land portions, each of said land portions engageable with an associated one of said cylinder means ends for permitting relative displacement of said dwell means with said piston means;
(h) said piston means including fluid port means communicable with said dwell portion when one of said land means engages one of said cylinder means ends for permitting fluid to flow between said ports and through said dwell portion;
(i) a continuous diameter aperture extends through said piston means;
(j) said dwell means is positioned within said aperture and said land portions have a common continuous diameter substantially equal to said aperture diameter;
(k) said aperture extends generally parallel to said cylinder means;
and,
(l) first and second fluid ducts are disposed in said piston means, each duct has a first opening in a wall of said piston means and a second opening communicating with said aperture for permitting fluid flow to be selectively established between said ports.

10 more elements