Double rod cylinder feed system
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United States of America Patent
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Sep 6, 1994
Issued Date -
N/A
app pub date -
Aug 16, 1993
filing date -
Aug 24, 1992
priority date (Note) -
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Abstract
A hydraulic system for moving a drilling head in a rectilinear motion between a mast crown and a mast table on a drilling machine includes a double rod hydraulic cylinder connected at a bottom end to a mast table and at a top end to a traveling sheave block; first and second flexible connector members for connecting a drilling head to the mast through the sheave block; and hydraulic feed circuitry for actuating the cylinder to move the sheave block and drilling head alternately in a first pulldown direction and in a second pullback direction.
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