| 摘要 |
The present invention relates to a drill bit capable of preventing the hammer from being inoperative, wherein a drive serve is spline-connected to the main body of the drill bit so as to vertically reciprocate, and the drive serve has an interval of a working space part in which the main body of the drill bit is arranged so as to have an injection hole communicating with a fluid pressure supply passage for discharging slime so that the slime coming into the working space part of the drive serve is removed by the fluid pressure injected through the injection hole, or the main body of the drill bit is provided with an upper injection opening communicating via a connection passage with the fluid pressure supply passage so that the slime interposed between the main body of the drill bit and the wall of a drilled hole is removed by operating a switch by means of the reciprocation of the drive serve, electricity, or fluid pressure so as to open at least one of the upper injection opening and the passage at the discharge side in the fluid pressure supply passage for discharging the slime, or the upper and lower contacting surfaces (40) between the drive serve and the main body of the drill bit are designed to be sloped towards the outside so that pushing the drill bit causes the slime coming into the working space part of the drive serve to be properly discharged. |
