| 摘要 |
A ladder rack for a vehicle roof comprises a sub-frame having clamps for releasable attachment to the roof of a vehicle. The sub-frame carries front and rear ladder support assemblies each comprising transverse rollers for engaging the stringers of a ladder spanning the two assemblies. Each support assembly further comprises a respective ladder-retaining member manually pivotable about a transverse axis from a lowered inoperative position to a raised rung-engaging position. The front and rear ladder-retaining members are operated by a handle or handles pivoted at one side of the rear support assembly, either independently or simultaneously. Furthermore, the rollers of the front support assembly are mounted to be manually raised and lowered. A ladder spanning the assemblies may be brought into a downwardly and rearwardly inclined orientation for off-loading from the rear of the vehicle. The manual operation of the front rollers is independent of the manual operation of at least the rear ladder-retaining member, so that a ladder may be brought to the inclined position in preparation for unloading while still being retained on the rack by the rear ladder-retaining member.
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