| 摘要 |
<p>An innerspring structure (10, 40) comprises a plurality of outer coils (12, 45) generally parallel with each other to form top and bottom face surfaces (24, 26, 52, 53). One or more of the outer coils (12, 45) has an inner coil (14, 55) of similar shape positioned coaxially with the respective outer coil (12, 45). In one embodiment, helical lacing wire (30, 61) wraps adjacent end turns of the coaxially aligned coils together to form reinforced coil units (16, 54). Helical lacing wire (30) connects the coils (16) of the structure together and connects the end turns of peripheral coils to a border wire (28). In another embodiment of the invention, the structure comprises a row of inner coils (55) and a row of outer coils (45), each formed from a single continuous piece of wire such that adjacent coils of the row are interconnected by interconnection segments (47). The rows of coils are positioned together so that the inner coils (55) are coaxial with the outer coils (45) to form reinforced coil unit (54).</p> |
