Spring structure for a mattress innerspring having coaxial coil units

摘要

An innerspring structure for a mattress comprises a row of outer coils formed from a continuous piece of wire with the coils interconnected with interconnection segments and a row of inner coils similarly formed. The interconnection segments of the coils form coil heads for pairs of adjacent coils and each head includes a first linear portion disposed generally parallel to the row. The row of inner coils is positioned together and generally coaxially with the row of outer coils for forming reinforced coil units. A helical lacing structure winds around portions of the inner and outer coils to couple the coils together into reinforced coil units and the first linear portions of the coils are configured for being captured with at least approximately three loops of the helical lacing structure for forming a row of reinforced coil units.