| 摘要 |
A composite exterior door structure comprising an inner frame of transversely connected elongated structural members formed of synthetic low thermally conductive material. The structural members have opposed parallel flat side walls and edge walls, the latter being formed with connecting channels. The structural members are interconnected to form a rectangular frame. Connectors of low thermally conductive material are connected to the connecting channels of inner ones of the edge walls of the structural members. An outer metal door covering is connected over an outer one of at least some of the opposed parallel flat side walls of the structural members and the connectors by displaceable connections to permit the outer door covering to shift due to expansion and contraction independently of the structural members. An inner door covering is immovably secured to an inner one of the opposed parallel flat walls and thermally insulated from the outer door covering.
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