| 摘要 |
A water bed mattress comprised of upper and lower flexible foldable sheets which are essentially rectangular in shape. The upper sheet is essentially formed by folding up portions of the lower sheet upwardly and inwardly and transversely sealing end margins of the folded up portions, and also thereby creating two peripheral transversely extending side wall sections. In addition, longitudinal end portions of the upper and lower sheets are also folded downwardly and upwardly, respectively, and sealed to each other to thereby form longitudinally extending side wall sections, and which, together with the upper and lower sheets, create an internal water chamber. In the making of the water bed mattress, end cut-outs are formed in the sheets. Moreover, insert panels are heat-sealed to the interior portions of the side wall sections to cover these cut-outs and thereby seal the interior of the mattress. In accordance with this construction, a water bed mattress can be formed with a minimum amount of material and which creates less seaming area and locates the corner areas in a position away from the frame which supports the water bed mattress. The present invention also provides a method and an apparatus for making the water bed mattress.
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