| 摘要 |
Roof structure for a land vehicle, such as a tractor-trailer, comprising a series of roof bows extending transversely across the top of the vehicle spaced at intervals along the length of the vehicle, each roof bow being formed of sheet metal to have in transverse cross-section a central web, side flanges integral with the web extending downwardly from the web, and lips integral with the flanges at the lower edge of the flanges opposite the web extending inwardly toward one another from the flanges and terminating short of the central vertical longitudinal plane of the beam so that the roof bow has a longitudinal slot at the bottom thereof, and a ceiling comprising sheets of plywood at the bottom of the roof bows, with fasteners for securing the sheets in place each extending up through a hole in the respective sheet and through the slot of a respective roof bow and engaging the bottom of the respective sheet and lips at opposite sides of the slot of a respective roof bow.
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