Springing for bed or mattress, comprises long spiral springs lying parallel and in same plane with interpenetration between turns

摘要

Springs lie parallel in the same horizontal plane. Their turns (4) material has axial width (a) exceeding the radial width and a pitch (pi) exceeding (a). Adjacent springs (2a, 2b) have connections (10, 20a, 20b) such that the distance (d) between spring axes (3a, 3b) is less than their diameters (D). Adjacent springs therefore interpenetrate through their pitch spacings.