| 摘要 |
<p>TO OBTAIN A PUSH-CUTTING BLADE (2), A FLEXIBLE BASE (1) AND A PROJECTION (TRAPEZOID-SECTION PROJECTION 21) PROTRUDING FROM THIS BASE ARE FORMED BY ETCHING. THEN, A LATERAL SURFACE OR SURFACES OF THE PROJECTION (21) IS CUT INTO A VERTICAL PROJECTION (2B). LASTLY, THE TIP OF THE VERTICAL PROJECTION (2B) IS SHARPENED TO GIVE A DOUBLE (OR SINGLE) CUTTING EDGE (2A).FIGURE 1</p> |
