Feed shell positioning mechanism
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United States of America Patent
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Aug 17, 1999
Grant Date -
N/A
app pub date -
Dec 31, 1997
filing date -
Dec 31, 1997
priority date (Note) -
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Abstract
An improved feed shell positioning mechanism for a rock drilling machine, having a boom, a feed shell support pivotably mounted with respect to the boom and supporting a feed shell having a feed shell axis, a roll actuator interposed between the boom and the feed shell support, and a rock drill having a rock drill axis. The rock drill axis and the feed shell axis are parallel and define a reference plane. The improvement resides in a swivel assembly for attaching the feed shell support to the roll actuator, allowing the feed shell support to swivel between a forward drilling orientation and a sideways drilling orientation. The swivel assembly has a roll actuator securing element, mounted to the roll actuator, and a feed shell support securing element, mounted to the feed shell support, which are pivotably mounted to each other about a swivel pivot axis which is inclined with respect to the reference plane. With the swivel pivot axis so inclined, the drill axis is moved into closer proximity to the roll actuator axis when pivoted to the sideways drilling orientation, providing a reduced moment arm for forces generated by the rock drill.
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