| 摘要 |
A sofa bed including a base, a seat section; and a back-rest section movable relative to the seat section between a generally upright position when the sofa bed is positioned for use as a sofa bed and a retracted, generally horizontal position coplanar with the front section when the sofa bed is positioned for use as a bed. In the sofa position, the seat section rests on the base with the back-rest section projecting generally upwardly at the rear side of the seat section while in the bed position, the seat section is displaced upwardly and forwardly relative to the base while the back-rest section is displaced forwardly into a horizontal portion coplanar with the seat section and overlying the base. The seat and back-rest sections are supported relative to the base by linkage mechanism which includes on each end thereof, front and rear swing arms both of which are pivotally mounted to the base at their lower ends with the front swing arm being pivotally connected at its upper end to the seat section. The upper end of the rear swing arm is pivotally connected to a carrier link, one end of which is pivotally connected to the back-rest section with an intermediate portion thereof being pivoted to an intermediate portion of the front swing arm. The forward extremity of the carrier link is pivotally connected to an actuating link which in turn is pivotally connected to a support leg for the seat section to move the support leg between extended and retracted positions when the sofa bed is moved between the bed and sofa positions.
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