| 摘要 |
PURPOSE:To make a synthetic resin door lightweight and to enhance the rigidity of the same, by forming a triangular framework with a horizontal frame having a length equal to the transverse width of the door, a vertical frame and an inclined beam, and by providing a door hinge at the attaching side of the vertical frame. CONSTITUTION:A vertical frame 3 is connected at its top end to the hinge side of a horizontal frame 2 having a length substantially equal to the transverse width of a door body 1. Further, the lower end of the vertical frame 3 is connected to the lock side of the horizontal frame 2 by means of an inclined beam 4 to form a triangular framework. This framework is jointed to inner surface of the door body 1 composed of an outer panel 7 and an inner panel 8. With this arrangement it is possible to make the door lightweight and to enhance the rigidity of the door.
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