Aligned mattress spring core

A mattress inner spring core comprising:

• a plurality of coil springs arranged in longitudinally extending columns and transversely extending rows,
• each coil spring being of a single piece of wire having an upper end turn in said first plane, a lower end turn in said second plane and a plurality of central convolutions between said end turns defining a central spring axis, each end turn comprising a first and second leg connected by a base web, said end turns being arranged such that a first portion of a first leg of one end turn of one coil spring overlaps a first portion of a second leg of an adjacent end turn of an adjacent coil spring in an overlapping region, each of said first and second legs of each of said end turns also having second portions thereof which are not overlapped,
• a plurality of parallel helical lacing wires connecting said end turns of said coil springs, each helical lacing wire comprising multiple revolutions encircling said overlapped region of adjacent end turns and at least one complete revolution encircling said second portions of said first and second legs.

A mattress inner spring core comprising:

• a plurality of coil springs arranged in longitudinally extending columns and transversely extending rows,
• each coil spring being made of a single piece of wire having an upper end turn in a first plane, a lower end turn in a second plane and a plurality of central convolutions between said end turns defining a central spring axis, each end turn comprising a first and second leg connected by a base web, said end turns being arranged such that a first leg of one end turn of one coil spring overlaps a second leg of an adjacent end turn of an adjacent coil spring in an overlapping region,
• a plurality of parallel helical lacing wires connecting said rows of coil springs, each helical lacing wire comprising multiple spaced connecting portions, each connecting portion of each helical lacing wire connecting two adjacent end turns by encircling said end turns in three sections, a first section in which said helical lacing wire encircles a first leg of one end turn of one coil spring, a second section in which said helical lacing wire encircles said overlapped region of adjacent end turns and a third section in which said helical lacing wire encircles a second leg of a second end turn of said adjacent coil spring.