| 摘要 |
A wire spring assembly adaptable for use in a mattress for a sleeper sofa or roll-away bed in which individual wire spring units are secured to each other and arranged in rows that extend transversely of the assembly. Each spring unit has a pair of end portions, a plurality of torsion bars and one or more connecting bars extending between the torsion bars. The end portions are adaptable to be attached to the corresponding end portions of adjacent spring units in the same row. The assembly further includes a plurality of flexible wire members extending longitudinally of the assembly substantially the length thereof, which are secured to the end portions of some of the spring units to position the rows while allowing the mattress to be folded.
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