Spring assembly

An improved spring assembly comprising

• a plurality of springs disposed in matrix-like fashion in a plurality of rows,
• at least one linear border connector strip in at least one of the upper and lower planes of said spring assembly, said border connector strip connecting the peripheral springs in said spring assembly one with the other, said connector strip being fabricated of a thermoplastic material, said connector strip defining jaw structure that receives a segment of each peripheral spring in gripping relation therewith, and said border strip jaw structure being heat welded around each peripheral spring segment for locking each adjacent peripheral spring to said border connector strip, and
• a linear row connector strip between at least one pair of adjacent rows of springs in that one of said planes in which said border connector strip is disposed, each of said row connector strips connecting the two adjacent rows of springs in each pair one with the other, said row connector strip also being fabricated of a thermoplastic material, said row connector strip defining jaw structure on both side edges of said strip from one end thereof to the other, said row jaw structure receiving a segment of each spring in the adjacent rows of each pair in gripping relation therewith, and said row jaw structure also being heat welded around each row spring segment for locking each adjacent row spring to said row connector strip,
• said border connector strips and said row connector strips thereby establishing a thermoplastic strip grid by which said plurality of springs are tied together one with another in that one of the upper and lower planes of said spring assembly.