Hydraulic drive mechanism for a vertical conveyor
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United States of America Patent
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-
Jun 1, 1999
Grant Date -
N/A
app pub date -
Dec 27, 1996
filing date -
Dec 27, 1996
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved hydraulic drive mechanism for a vertical conveyor. The conveyor comprises a pair of upright supports or columns and a carriage to support a load or cargo is guided for vertical movement on the columns. The drive mechanism includes a pair of first hydraulic cylinder units and a pair of second hydraulic cylinder units that preferably have twice the length of the first cylinder units. The first or shorter cylinder units are connected between a movable cross beam and the carriage, while the second cylinder units are connected between the movable beam and the upper end of the frame. At a lower level both the first and second cylinder units are in an extended condition, while at an upper level both cylinder units are retracted.
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Cited Art Landscape
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