| 摘要 |
PROBLEM TO BE SOLVED: To provide a drilling tool capable of eliminating wasteful consumption of a cutting fluid by automating the supply of the cutting fluid from a tank. SOLUTION: The drilling tool comprises a drilling blade 2 moving up and down with respect to the surface to be drilled S of the applicable material, the tank 14 for the cutting fluid installed over the blade 2, an outflow hole 16 in communication with the tank 14 from which 16 the cutting fluid flows out, a valve element 18 to open and close the outflow hole 16 while it moves in the vertical direction with respect to the outflow hole 16, and a pipe 20 constituting a flow passage for guiding to the blade 2 the cutting fluid having flowed out of the outflow hole 16. The pipe 20 makes vertical motions interlocking with the vertical motions of the blade 2. When having moved upward, the pipe 20 lifts the valve element 18 so as to close the outflow hole 16. When the pipe 20 has moved downward, the valve element 18 moves downward to open the outflow hole 16. COPYRIGHT: (C)2007,JPO&INPIT
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