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俄罗斯特米特洛夫斯基铣床工厂研制出一种用来固定直柄切削刀具的具有等轴三棱型外表面的瓣形夹套式的弹簧夹头(作者发明证1572761,见图)。在夹头的本体2内安置有弹性夹套3,在夹套3末端配置有一条与其轴线成5°角的槽4。把旋到本体2中的支承钉1引入这个槽内。
Russia’s Mitelovski Milling Machine Factory has developed a trilocular-type collet chuck with an equilateral triangular outer surface for securing a shank-cutting tool (author’s ID 1572761, see photo). An elastic jacket 3 is arranged in the body 2 of the collet and a groove 4 is arranged at the end of the jacket 3 at an angle of 5 ° to its axis. The support pin 1 screwed into the body 2 is introduced into this groove.