| 摘要 |
<p>The present invention relates to a pestle having protrusions. The pestle comprises a case, a grinding part, a knocking part, and a suspension part. The case has a space inside and is formed with a plurality of holes on a bottom part connecting the space to an outside. The grinding part is provided on the bottom and inner part of the case and protrudes outside through the holes. The knocking part allows the grinding part to protrude outside by applying pressure on a bottom part, and fixates the same. The suspension part absorbs the pressure applied onto the grinding part. And the grinding part repeats a movement of protruding or being inserted to the case every time when pressurizing the knocking part.</p> |
