Hydraulic controller for hydraulically actuated liftable and lowerable hook of crane
Number of patents in Portfolio can not be more than 2000
United States of America
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Apr 13, 2021
Grant Date -
Sep 13, 2018
app pub date -
Aug 16, 2016
filing date -
Aug 16, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A hydraulically actuated liftable and lowerable hook of a crane has a hydraulic system comprises at least one working machine with a hydraulic motor driving a winch. At least one drive machine comprising a pump is connected directly or indirectly to at least one of the working machines by means of two connections via corresponding working lines, which serve as a feed or return depending on the operating state of the working machine. A lowering brake valve is provided in one working line and is connected to the other working line via a control line such that the lowering brake valve is displaceable against a restoring force by pressure, which prevails in the other working line and is forwarded via the control line, from the blocking position of said valve into a through-flow position for lowering the hook by means of a primary winch.
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