| 摘要 |
A recreational vehicle vent (14,16) is formed of a streamlined body (12) having a forward fixed riser (14) and a movable cover (16) which, when closed, forms a smooth continuous aerodynamic surface together with the fixed riser. The cover is movably mounted to the vent frame by means of a pair of transversely extending crossed links (140,142) at the front and a second independent pair of transversely extending crossed links (200,202) at the back. The two link pairs are independently operated by geared actuators (180,206) so that either the front of the cover or the back of the cover can be independently lifted or both can be lifted together.
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