| 摘要 |
A resilient unit is shown generally at 10, and comprises a structural portion (12) and a support portion (14). The structural portion is formed by rows of large pocketed metallic coil springs (16). In particular two rows of slightly longer pocketed springs (16a) form the side walls (S) of the structural portion, whilst an array of slightly shorter ones (16b) form a base (B) of the structural portion. The support portion (14) is formed of a pocketed spring unit (18) comprising a plurality of metal coil springs individually encased in pockets formed by layers of thermally weldable, non-woven material that are joined together at locations between the springs. The raised side walls (S) formed by the rows of tall springs (16a) form a recess within which the pocketed spring unit (18) rests on the springs of the base (B). No adhesive is used in the resilient unit (10). The tall springs are formed in rows by welding layers of the pocket material together along seams that run axially beside the springs. The rows themselves are then joined by thermally welding together their edges and/or their ends, or by welding a common layer of material across the ends of the pocketed springs. The spring unit (18) is loosely rested upon the base so that it may be removed and replaced with another, similar unit of a different gauge, or combined with such another unit. |
