| 摘要 |
<p>PURPOSE:To prevent the irregular deformation by forming a square bellows body from a square cylindrical body having a number of expandable pleats on the peripheral surface and forming a means for suppressing the expansion and contraction on the edge part of the opened port by cutting a part of the peripheral surface. CONSTITUTION:A square bellows body 1 made of soft synthetic resin is constituted of a square cylindrical body 3 having a number of expandable pleats 2 on the peripheral surface. An opened port 4 is formed by cutting a part of the peripheral surface of the square cylindrical body 3, and on the edge surface, a means for suppressing the expansion and contraction is formed by integrally closing the bottom part of the expandable pleats 2 by a plate body 21 from the basic bottom part 2a side. Therefore, the whole can be expanded and contracted uniformly, and the irregular deformation is suppressed.</p> |
