Truss structure, structural members thereof, and a method of manufacture therefor
OwnerBunichi Shojiinventor
Life of this patent
Estimating the term…
Abstract
A joint having an improved rigidity realized by a shortened inter-joint distance and suitable for use in a truss structure is provided. A connection part is formed on the end of a pipe member to be used as a chord member. The connection part of the pipe for connecting with a parent plate for assembly of the truss structure is comprised of a tubular section formed by constrained pattern pressing of the pipe, and a flat section which is formed integral with and in close proximity to the tubular section.
Claims2
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.
A method of forming a truss structural member such as an upper chord, a lower chord and a diagonal chord members to be used in a truss construction, each member having a connection part formed on the end thereof, using a die having an upper die and a lower die, each including a flat surface press section, a semicircular cylindrical surface press section and a curved surface press section, comprising
- mounting an end of a pipe member in said die;
- and
- forming a pipe tubular section and a flat section of the connecting part simultaneously by constrained pressing through said die,
- wherein the pipe tubular section has a curved surface and extends from and integral with the pipe member, and the flat section is flattened into a single piece 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 includes respective transitional slack portions at both ends of the semicircular boundary of the pipe tubular section.
Dependencies are inferred from the claim text.