| 摘要 |
<p>Innerspring unit assemblies comprising an arrangement of coil springs in rows and columns are improved by replacing traditional coil springs with triple offset coil springs in an optimum arrangement. The triple offset coil springs are arranged such that a high coil density is maintained to ensure a high degree of firmness while adequate clearance is provided between the columns such that spring squeaking and/or clicking is avoided. Terminal convolutions defined by traditional coil springs are improved such that the terminal convolutions (10) of the present invention define first, second and third offset segments. The first (12), second (14) and third (16) offset segments of the present invention are disposed substantially in a plane. The third offset segments (16) are formed between the first (12) and second (14) offset segments by reshaping an arc side defined by the terminal convolutions of traditional coil springs. Improved triple offset coil springs (30) of the present invention offer structural advantages when incorporated into improved innerspring unit assemblies, such as increased firmness and increased clearance between rows. The triple offset coil springs (30) also permit optimal usage of wire at borders as well as within borders.</p> |
