摘要 |
The object is divided into several annular superposed longitudinal sections (1 -12) each delimited by two parallel annular plane junction faces (1a,1b,10a,10b). Several plane elements each have two parallel faces with dimensions greater than those of the corresponding section faces. On one face of each plane element is traced the external contour of one face of the corresponding section. The centre of each element second face is marked opposite to its first face and the external contour of corresponding section traced on it. Each element central part is hollowed out to form a crown (1 -12) limited by the two annular face junctions (1a,1b,10a,10b). The elements (1 - 12) are assembled by placing in contact and fixing the junctions. USE - Simple manufacture without complex tools of hollowed objects.
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