Patent ID: 6604401
Filing Date: 2003-08-12
Classification: E04B,E04C

Abstract:
A die for forming a connection part on the end of a pipe member for use in a truss construction as its structural member including an upper chord, a lower chord and a diagonal chord members, comprising:an upper die and a lower die, each of which includes a flat surface press section, a semicircular cylindrical surface press section and a curved surface press section which, together, allow the connection part to be formed having a pipe tubular section formed by the pipe member with a cylindrical drawing press to include a curved surface, and extending from and integral with the pipe member, and a flat section formed by the pipe member being flattened through a flat press into single pieces having width determined by the diameter of the pipe member, and extending from and integral with the pipe tubular section, the pipe tubular section defining a semicircular boundary with the flat section and the flat section including respective transitional slack portions at both ends of the semicircular boundary of the pipe tubular section.