Patent ID: 8814481
Filing Date: 2014-08-26
Classification: B23B,B23Q,F16N,Y10T

Abstract:
1. An oil supply device for a hole cutting apparatus, comprising: a support member; a holder supported by the support member to be rotational relative to the support member and movable in a reciprocating manner in a direction along a rotational axis; a cutter attaching portion provided on a first side of the holder; an oil supply pipe having a valve port, the oil supply pipe being attached to the support member by being inserted into the holder along the rotational axis of the holder on a second side, which is a side opposite to the cutter attaching portion in the direction along the rotational axis of the holder; a pin for discharging a cut piece, wherein the pin is inserted into the cutter attaching portion from the first side of the holder along the rotational axis of the holder, and is movable in a reciprocating manner in the direction along the rotational axis of the holder; and a valve body, which is inserted into the holder between the oil supply pipe and the pin along the rotational axis of the holder, wherein the valve body is movable in a reciprocating manner in the direction along the rotational axis of the holder, wherein the oil supply pipe, the valve body, and the pin are arranged relative to the holder and along the rotational axis of the holder, the holder, the pin, and the valve body are movable in a reciprocating manner in the direction along the rotational axis of the holder in relation to the oil supply pipe, the valve body is movable in a reciprocating manner in a direction along the rotational axis of the holder in relation to the pin, at a proximate position, where the cutter attaching portion of the holder is close to the oil supply pipe, the valve body contacts the valve port of the oil supply pipe, while being supported by the holder, so that the valve body closes the valve port, and at a separated position, where the cutter attaching portion of the holder is separated away from the oil supply pipe, the valve body is separated from the valve port of the oil supply pipe, while being supported by the pin instead of the holder, so that the valve body opens the valve port, wherein the valve body includes: a rod portion, which is separated from the pin when at the proximate position and contacts the pin when at the separated position; and an opening-closing portion supported by the rod portion, wherein the opening-closing portion contacts the valve port of the oil supply pipe when at the proximate position and is separated from the valve port of the oil supply pipe when at the separated position.