| 摘要 |
A rectangular tube ( 10 ) is formed such that a pair of side plates ( 12 L, 12 R) stand up from the opposite left and right edges of a bottom plate ( 11 ) and an extending end of an upper plate ( 13 ) extending from the upper edge of the left side plate ( 12 L) substantially in parallel with the bottom plate is placed in contact with the upper end surface of the right side plate ( 12 R). The upper plate ( 13 ) has an embossment ( 18 R) projecting in and a pressing portion ( 14 ) extending from the upper edge of the right side plate ( 12 R) is placed into contact with the upper surface of the embossment ( 18 R) to prevent an upward movement of the upper plate ( 13 ). Thus, the height of the rectangular tube ( 10 ) can be reduced by a recessed dimension of the embossment ( 18 R).
|
