Vehicle With Solicited Carriage Descent
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United States of America Patent
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Issued Date -
Mar 27, 2014
app pub date -
Sep 21, 2012
filing date -
Sep 21, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A vehicle includes a vehicle frame, a vertical mast coupled to the vehicle frame, and a carriage movably mounted to the mast for ascending and descending along the mast. At least one hydraulic cylinder moves the carriage along the mast, a hydraulic pump pumps hydraulic fluid into the hydraulic cylinder, and a flow valve controls the flow of hydraulic fluid between the hydraulic pump and the hydraulic cylinder. A sensor senses an actual descent speed of the carriage and a controller controls the flow valve to allow descent of the carriage at a requested descent speed. The controller controls the flow valve to limit descent of the carriage to a unsolicited descent speed limit if a difference between the actual descent speed and the requested descent speed exceeds a threshold value.
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