| 摘要 |
A pocketed spring assembly (12) comprises a plurality of parallel strings of springs (26, 26a, 26b), each string joined to an adjacent string, each string (26, 26a, 26b) comprising first and second opposed plies of fabric (47, 49) and a plurality of pockets (34) formed along a length of the string by transverse seams (52) joining the first and second plies (47, 49). At least one spring (36, 36b) is positioned in each pocket (34). An upper end of each transverse seam (52) is below the upper surface (60) of the string so as to partially separate adjacent pockets (34) within a string of springs (26, 26a, 26b). Each spring (36, 36b) has two end portions (46, 48, 46b) and a middle portion (44, 44b). The convolutions (42, 42b) of the middle portion (44, 44b) are greater in diameter and pitch than the convolutions of the end portions (46, 48). |
