| 摘要 |
<p>PURPOSE:To prevent the abnormal transformation of an eaves trough by applying metal leaves to the under surface of the main body of an eaves trough made of hard synthetic resins for the transformation and restoration like a bimetal. CONSTITUTION:To the under surface of the main body 1 of an eaves trough formed by synthetic resins, copper leaf, aluminium foil, steel paper, and other metal leaves 2 are applied by tight pressing. When strong sunshine is given, the eaves trough is given a high temperature, and its curvature is reduced by the transformation in the width like a bimetal as the expansion rate of the main body 1 is greater than that of metal leaves. When the sunshine is weak under rain or some bad weather to give relatively a lower, temperature to the eaves trough, a transformation is given to increase the curvature reversely to restore the original shape as the contraction rate of the main body 1 is smaller than that of metal leaves 2.</p> |
