Abstract: A mattress covering sewing machine includes a pair of upper and lower support plates for supportingly sandwiching therebetween a cushion wrapped with a pair of box-like outer covers. The support plates have outer peripheral portions extending in a manner to correspond to the shape of the outer peripheral portion of the cushion and coming into contact with the outer peripheral portion of the cushion through the box-like outer cover. The upper plate is mounted to be vertically movable so that the cushion is automatically and uniformly compressed in a direction of thickness of a cushion to permit the outer marginal edge portions of the adjacent box-like covers to be projected outward. The outer marginal edge portions of the adjacent box-like covers are sewn together to provide a mattress. The sewing device can be moved around the entire outer marginal edge portions of the adjacent box-like outer covers.

Abstract: A mattress covering sewing machine has a pair of upper and lower support means on which a cushion is wrapped with a box-like outer cover and outer cover disposed under the open end of the box-like outer cover. The upper support means is adapted to be lowered so that the wrapped cushion is uniformly compressed in a direction of thickness of the wrapped cushion so as to permit the outer marginal edge portions of the adjacent outer covers to be sewn together. A sewing device is adapted to be moved around the entire outer marginal portions of the adjacent outer covers.

Abstract: A wire spring-manufacturing apparatus which comprises a wire feeder; a device for clamping a straight wire of prescribed length delivered from the wire feeder substantially at the center and intermittently rotating said wire about its axis; and a pair of wire-bending devices so disposed as to intermittently approach each other toward the wire-rotating device relative to the rotation of said wire, thereby successively bending both end portions of said wire to form spring legs.

Abstract: Disclosed is a mattress comprising a flat-constructed spring assembly, a pair of elastic material sheets which are attached to upper and lower faces of said spring assembly and whose peripheral edge portions are so extended as to form a space at a side peripheral portion of said spring assembly and opposed to each other at their respective tip ends, and a side-elastic material member formed in said space by subjecting a foamable plastic to foaming-in-place, and a covering means for covering an elastic body consisting of said spring assembly, said elastic material sheets and said side-elastic material member, whereby to eliminate a feeling of physical disorder during the use of the mattress and to prevent a mattress body from being subject to lateral swing or rocking motion.

Abstract: An apparatus for manufacturing corner springs which comprises a pair of spring leg-forming mechanisms for folding both ends of a wire several times to provide spring legs at said ends; a pair of heat-treating devices for heat-treating a wire having spring legs formed at both ends; and a pair of spring leg-bending mechanisms for bending the heat-treated spring legs.