Oil supply device for hole cutting apparatus
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United States of America Patent
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Aug 26, 2014
Grant Date -
Dec 27, 2012
app pub date -
Mar 15, 2012
filing date -
Jun 21, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
An inner cylinder, a pin, and a valve body are movable in a reciprocating manner in a direction along the rotational axis in relation to an oil supply pipe. At a proximate position, where a cutter attaching portion is close to the oil supply pipe, a rod portion of the valve body is supported by a pressure receiving portion of the holder inner cylinder due to the elastic force of a compression coil spring, such that an opening-closing portion of the valve body closes a valve port of the oil supply pipe. At a separated position, where the cutter attaching portion is separated from the oil supply pipe, the rod portion of the valve body is supported by the upper end of the pin due to the elastic force of the compression coil spring, instead of the pressure receiving portion, such that the opening-closing portion opens the valve port.
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