Lift truck mast having high visibility and extensibility
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United States of America Patent
Stats
-
Apr 14, 1981
Grant Date -
N/A
app pub date -
Jul 18, 1979
filing date -
Jul 18, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An extensible-contractible four-stage telescopic mast for a lift truck having a single fluid-actuated ram of low-collapsed height for high visibility which accomplishes both free lift and mast extension. The associated chain reeving of the mast provides a lesser ratio of load carriage speed to ram extension speed during free lift than during mast extension. To obtain substantially uniform speed of the load carriage throughout its lifting range, the ram assembly has a variable speed of extension substantially inversely proportional to such ratio such that ram speed is higher during free lift than during mast extension. An arrangement of the four mast sections, associated chain reeving and hydraulic conduits is provided which is especially conducive to high visibility and maximum load capacity.
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Cited Art Landscape
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