Log grapple device
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United States of America Patent
Stats
-
Aug 2, 1983
Grant Date -
N/A
app pub date -
Aug 24, 1981
filing date -
Aug 24, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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