Method of assembling two shaped sections with a cotter

A method for assembling first and second shaped sections at substantially perpendicular directions comprising:

• providing a first shaped section having a wall (1a), two flanges (1b, 1c), two bends (1d, 1e) and a slot formed in said wall, said slot having a configuration such as to receive said second shaped section therein,
• providing at least one cotter (3) comprising a rod (3a) having a thinned segment formed on a portion of its periphery,
• providing a second shaped section having a cross-sectional configuration complementary to said slot and at least one circular aperture for receiving a cotter, said aperture being positioned in said second shaped section such that when said second shaped section is inserted in said slot and abutted against said bends, said aperture extends beyond said first section a distance at least as great as the thickness of said cotter at said thinned segment and less than the thickness of said cotter at its unthinned segment,
• inserting said second shaped section (2) into said slot (4) until its end (2a) abuts the bends (1d, 1e) of said first shaped section,
• inserting said at least one cotter into said at least one aperture with said thinned segment against the wall of said first shaped section, and
• rotating said at least one cotter about the longitudinal axis thereof for urging the unthinned portion thereof in compression against said wall.