| 摘要 |
A tool for use in removing plastics material from a hole comprises a work surface adapted to contact the material. Piezo electric transducer means operatively connected through a work horn to the work surface cause it to vibrate ultrasonically and thereby to heat locally the plastic material. A cavity adapted to received heated plastics material. The cavity is connected to a working zone adjacent the work surface. The work surface comprises an elongate boring member and rearwardly thereof a substantially annular cutting edge with at least one cutting fin extending radially outwardly. The working zone is connected to said cavity means by means of apertures disposed between said boring member and said annular cutting edge. <IMAGE> |
