| 摘要 |
PURPOSE:To reduce the percent defective of final products and reduce the cost by reducing the number of works of lamination of a heat insulation mate rial and further reduce variations of the installation location of the heat insula tion material. CONSTITUTION:There are integrally formed with a synthetic material a pair of right and left side plates 10, a bottom plate 20 located between lower ends of both side plates 10, and a slanting plate 30 extending slantingly downwardly from one side to the other of the side plate 10 in the width direction of the same. Further, in the integral formation of the side plates, the bottom plate 20, and the slanting plate 30 heat insulation plates 23, 38 comprising a foaming material are integrally formed with respect to at least any surface of the bottom plate 20 and the slanting plate 30 to cover the surface. |
