Spring unit for mattress or sofa, assembled of two funnel shaped elastic elements joined with their narrow ends

摘要

Each of the two spring elements is assembled of a circular base (1) with slots (9) for a reduction in weight, triangular support segments (10) pointing from the outer ring towards the center and four strips (3) leading from the inner edge to the circular joint area and forming a funnel in combination with the base (1) and the lower ring. The two identical spring elements are joined by engaging corresponding projections and recesses (7, 8) located at the joint areas.