Log grapple device

Details Log grapple device Log grapple device

1981-08-24

1983-08-02

Cherry, Johnny D.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

91437, 414730, B66C 316, F15B 13042

Patent

active

043962157

ABSTRACT:
A hydraulic system (10) for a log grapple device (12), including an unloader valve (20) and an accumulator (22) located downstream of a control valve (18) which determines the direction of fluid flow to the actuating cylinder (108) controlling the opening and closing of the grapple device. When a predetermined operating pressure is reached the unloader valve diverts outlet flow from a pump (16) to a reservoir (14) and isolates the system downstream of the unloader valve, the accumulator maintaining pressure on the grapple device. When the grapple device is to be opened, a pilot check valve assembly (60) within the unloader valve permits reverse flow through the unloader valve.

REFERENCES:
patent: 3152706 (1964-10-01), Conrad
patent: 3627351 (1971-12-01), Zimmerman et al.
patent: 3854766 (1974-12-01), Jordan
patent: 4313633 (1982-02-01), Muntjanoff et al.

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