Boring head, roller cutter and saddle for a boring head for rotary drilling
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United States of America Patent
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Aug 16, 2005
Grant Date -
Jun 12, 2003
app pub date -
Dec 10, 2002
filing date -
Dec 10, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A raise boring head includes a roller cutter body and a saddle intended for rotary drilling in earth and rock formations. The roller cutter body is rotatably journalled on a shaft that is provided with two shaft spigots at its opposite ends. Each spigot has a second support surface provided for cooperation with a first support surface of the saddle to hold the roller cutter to the saddle. Each shaft spigot is provided with a hole for receiving a fastener that also passes through the second support surface in order to connect the shaft spigot to the saddle. The first support surface and the second support surface are curved. The first support surface and the second support surface connect directly or indirectly to stop shoulders for counteracting rotation of the shaft. The fastener is eccentric to the shaft axis and arranged to press the stop surfaces together.
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