HOLLOW EXTRUDED PRODUCT AND ITS MANUFACTURE

摘要

PURPOSE:To obtain an independently and satisfactorily loaded state without using other members such as a spacer and a stabilizer. CONSTITUTION:A swollen thickness part 15 obtained by swelling the inner wall of a hollow part 11 is provided in a hollow inner part 13 of the hollow part 11 having the same contour across the entire length of a hollow extruded product 1. The essential part such as a corner of the hollow part 13 is reinforced by the swollen thickness part 15 and thus a necessary rigidity, i.e., a balance maintenance is obtained.