Patent ID: 6681428
Filing Date: 2004-01-27
Classification: A47C

Abstract:
A method of making a spring unit comprising the steps of:arranging a plurality of rows of pocketed coil springs, each row including a plurality of coil springs each encased in a fabric pocket, each fabric pocket having a top end, a bottom end and a sidewall between the top and bottom ends, the sidewalls of the fabric pockets of each row of pocketed coil springs being juxtaposed to the sidewalls of the fabric pockets of an adjacent row with the top and bottom ends of the fabric pockets combining to define top and bottom surfaces, respectively, of the spring unit; bonding a plurality of top sheets to the top ends of the fabric pockets of selected pocketed coil springs, each of the top sheets being generally perpendicular to the rows of pocketed coil springs and separated by a spacing from an adjacent top sheet; bonding a plurality of bottom sheets to the bottom ends of the fabric pockets of the selected pocketed coil springs, each of the bottom sheets being generally perpendicular to the rows of pocketed coil springs and aligned with one of the top sheets; bonding the sidewalls of the fabric pockets of the pocketed coil springs in the spacings between adjacent top sheets to the sidewalls of the fabric pockets of pocketed coil springs in an adjacent row to provide differing performance characteristics to the pocketed coil springs located in the spacings relative to the selected pocketed coil springs.