| 摘要 |
<P>PROBLEM TO BE SOLVED: To pull out roots by combining a spring and a weight. <P>SOLUTION: A pointed metal fitting is installed at one end of a core rod. A receiving metal is installed at the one end. The weight large 10 is made to slide in a direction for the receiving metal by sliding the spring and the weight, respectively, so that the force is continuously added, eventually transmitting the force to the pointed metal. <P>COPYRIGHT: (C)2012,JPO&INPIT |
