| 摘要 |
The specification is best illustrated by reference to FIG. 1wherein a cross-section of a mattress, indicated generally at 1,is taken across the width of the mattress so that the view is along the length of the mattress. The following describes a rectilinear mattress having orthogonal side and end walls, regardless of the lengths of the walls as may vary among different conventional mattress from twin to king. The specification pertains to mattress of all sizes. The internal construction of the mattress includes an innerspring assembly, indicated generally at 10, including a plurality of spring coils 11 (referred to herein simply as "coils"), each having a series of intermediate helical convolutions 12 and top and bottom terminal convolutions, 13 and 14 respectively, each of the convolutions having a common generally vertically oriented axis. The coils 11 may be arranged in the innerspring assembly in any manner, but are most commonly arranged in rows to fill substantially the entire area within the generally rectilinear perimeter of a mattress, as described for example in U.S. Pat. No. 4,092,749, incorporated herein by reference, and shown in FIG. 8. The terminal convolutions 13 and 14 of each of the coils are commonly connected by cross-helical lacing wires 15 which are laced about the tangential terminal convolutions of the coil in adjacent rows, across the width of the innerspring assembly 10. An end cross-helical wire is also installed along the terminal convolutions of the coils in the end rows of the innerspring assembly. However, because there may be no borderwire in the innerspring assembly with which the wall structures of the invention are engaged, there is no side helical wire about the terminal convolutions along the side of the innerspring assembly. Although described in this regard, it is understood that the mattress may embrace an innerspring assembly which is entirely conventional, having upper and lower border wires, and a helical lacing wire about the border wires and the perimetrical coils.
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