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卡头包括内套1,在其上有外套4。带锥齿圈5的开合螺母装在内套的环形槽中,齿圈5与夹爪8为螺纹连接,夹爪装在内套的纵向斜槽9中。在内套中作出三个径向孔3以使卡头搬手定位,用拧在内套螺纹柄部上的螺母和防松螺母靠弹簧将外套压向夹爪方向。在内套中心作出锥孔以与主轴(图中未示出)连接。外套包住带锥齿圈的开合螺母,并防止其分开,形成与扳手锥齿轮7端面相互作用的罩6。
The chuck comprises an inner sleeve 1 on which a jacket 4 is provided. The open-close nut with the bevel gear ring 5 is arranged in the annular groove of the inner sleeve, the ring gear 5 is screwed with the clamping jaw 8, and the clamping jaws are arranged in the longitudinal chute 9 of the inner sleeve. Three radial holes 3 are made in the inner sleeve to position the chuck. The outer sleeve is pressed against the jaws by the spring with the nut screwed on the inner sleeve shank and the locking nut. A tapered bore is made in the hub center to connect with the spindle (not shown). The jacket surrounds the opening and closing nut with the bevel gear and prevents it from separating to form a cover 6 that interacts with the end face of the wrench bevel gear 7.