| 摘要 |
A mattress innerspri?g having coil-in-coil springs arranged in an array. Each coil-in- coil spring (100) has an outside helical coil (10) and an inside helical coil (20). The outside helical coil has a greater height and diameter than the inside helical coil. Each coil has a dual spring rate between that of the outside helical coil and the combined spring rates of the outside and inside helical coils. The coil-in-coil springs may be pocketed or unpocketed in a mattress innerspring.
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