Freely rotatable closed grapple head and machine using same

Details Freely rotatable closed grapple head and machine using same Freely rotatable closed grapple head and machine using same

2007-01-05

2009-11-10

Underwood, Donald (Department: 3652)

Material or article handling

Vertically swinging load support

Grab

C414S729000, C294S086400, C294S104000, C037S468000

Reexamination Certificate

active

07614843

ABSTRACT:
A machine includes a chassis and a boom assembly. The boom assembly is movable relative to the chassis. The machine further includes a grapple assembly suspended from the boom assembly. The grapple assembly comprises a grapple head fluidly connected to a first hydraulic circuit for actuating the grapple head to a grasping configuration, and a hydraulic motor fluidly connected to a second hydraulic circuit for rotating the grapple head. The second hydraulic circuit includes a bypass valve. The bypass valve has a first position configured to block a fluid flow between a first port of the hydraulic motor and a second port of the hydraulic motor. The bypass valve also has a second position configured to allow a fluid flow between the first port of the hydraulic motor and the second port of the hydraulic motor. The bypass valve allows the grapple head to rotate freely when the grapple head is in a grasping configuration.

REFERENCES:
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patent: 4315652 (1982-02-01), Barwise
patent: 4396215 (1983-08-01), McCutcheon
patent: 4431365 (1984-02-01), Sturtz, Jr.
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patent: 4679839 (1987-07-01), Damron
patent: 5018935 (1991-05-01), Gage
patent: 5499503 (1996-03-01), Stoychoff
patent: 5540050 (1996-07-01), Krupowicz

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