| 摘要 |
<p>1,074,922. Mineral-mining picks. TUNGSTEN CARBIDE DEVELOPMENTS Ltd. Dec. 28. 1965 [Jan. 9, 1965], No. 1090/65. Heading E1F. A hard metal lip having a shouldered enlargement at the end remote from the operative end is fitted into a bored nose of tool steel, the nose having a bore fitting accurately the length of the tip up to the shoulder and a counterbore the end of which fits shoulder accurately. The nose with the lip therein is then butt-welded to a tool steel pick body whilst a compressive pressure is applied to the nose and the body whilst the weld is made. Thus the shoulder of the lip is held to the end of the counterbore by metallic pressure maintained on the end face of the shouldered end.</p> |
