苏联某工艺装备技术研究所研制了无扳手的手摇钻用钻头卡盘(图a)。该卡盘是由壳体1、控制离合器3、锥形滚柱5、弹簧隔离板4、花瓣形限制器2与止推轴承6组成。在壳体内制一孔a,用以紧固卡盘于手摇钻的心轴上,并制一孔6放置夹紧钻头的锥形滚柱。孔6呈多棱 Soviet Union, a technology and equipment Institute of Technology has developed a wrench drill hand drill chuck (Figure a). The chuck is composed of a housing 1, a control clutch 3, a tapered roller 5, a spring isolation plate 4, a petal-shaped stopper 2 and a thrust bearing 6. A hole a is made in the shell to fasten the chuck to the mandrel of the hand drill and make a hole 6 to place a tapered roller for clamping the drill. Hole 6 is polygonal