| 摘要 |
<p>PCT No. PCT/GB83/00245 Sec. 371 Date May 10, 1984 Sec. 102(e) Date May 10, 1984 PCT Filed Oct. 3, 1983 PCT Pub. No. WO84/01529 PCT Pub. Date Apr. 26, 1984.A tool for use in manufacture of a hollow article with an undercut internal surface, such as the outer member of a constant velocity ratio universal joint, comprising first and second elements (34,38) together defining the shape required in the article interior and an internal cavity (40). An expander (23) fits in the cavity to hold the elements in their operative positions, and the first elements have parallel or outwardly convergent sides which enable their inward movement between the second elements after withdrawal of the expander from the cavity. After such inward movement, the first elements can be withdrawn from the shaped article, followed by the second elements.</p> |
