Grappler control system for a gantry crane
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United States of America Patent
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-
Nov 29, 2005
Grant Date -
N/A
app pub date -
Jul 9, 2002
filing date -
Jul 9, 2002
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system and process are provided for controlling motion of a grappler of a gantry crane to avoid damaging an object to be lifted. In an embodiment, a speed of grappler movement is automatically reduced when in close proximity to the object. Furthermore, the grappler automatically stops when positioned appropriately to permit a latching mechanism to engage the object for lifting. Normal speed grappler motion is restored when the latching mechanism is fully engaged. In a particular embodiment, the grappler includes a plurality of height sensors at various positions along the grappler to determine the respective height of the grappler above a top of the object. Vertical motion of front and rear ends of the grappler are independently actuated and controlled to permit appropriate control when the grappler and/or the object are not level.
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