| 摘要 |
A concave half ( 10 ) having a conical inside and a convex half ( 20 ) having a conical outside and being fitted therein are fitted in each other. An openable and closable, loop-shaped supporting means as a toggle-jointed link ( 30 ) rotatably supports and pushes a cylindrical part ( 23 ) of the convex half ( 20 ) onto the axis on at least three points on the outer periphery of the cylindrical part ( 23 ), with an axis of the concave half ( 10 ) and an axis of the convex half ( 20 ) being aligned with each other when the supporting means is closed. The toggle-jointed link ( 30 ) is openable and closable, wherein a plurality of rolling objects such as rollers ( 31 ) are provided inside the loop, thereby improving function as a bearing of the supporting means and efficiently manufacturing quality rolled cones ( 40 ).
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