| 摘要 |
Sample-boring instrument which is easy to use even in confined spaces and with which a detached bored core can be handled with such a high degreee of care that is is not disorientated or contaminated by mechanical action or contact with foreign matter. According to the invention, the sample-boring instrument consists of a tubular boring body (1), one end section of which is made with a cutting edge (5) extending round the end surface of the tube, and a centring and ejecting rod (2) which is movably guided inside the tube, the terminal positions of which are chosen so that the end of the rod located nearest to the cutting edge can be moved from a position in which it is retracted inside the tube into an outer position in which the said end is located outside the cutting edge. |
