LIFT TRUCK WITH PRODUCTIVITY ENHANCING PACKAGE INCLUDING VARIABLE TILT AND VERTICAL MASTING
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United States of America Patent
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N/A
Issued Date -
Oct 23, 2008
app pub date -
Apr 18, 2008
filing date -
Apr 23, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and apparatus contemplate a variable mast tilting feature that restricts mast tilt speeds and tilt ranges at a time when the forks are relatively high. Conversely, when the forks are low, no restrictions exist other than operating set-points. A High/Low switch on the mast determines when the forks are high or low. A tilt angle sensor (preferably a linear actuator on the tilt cylinder) determines the amount of mast tilt. A vertical masting feature automatically makes a mast substantially perpendicular to the ground. Activation of a vertical function change button, in combination with an activated tilt lever, causes the mast to upright itself (in either the forward or reverse directions of movement). Also, if the mast is relatively high, the speed of mast 'uprighting' will be relatively slower than if the mast is relatively low. Hydraulic and electric circuit diagrams, to name a few, are also disclosed.
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