A foldable tension spring mattress, wherein a vertical pressure is converted into a tension by means of a wrapping blanket; the tension acts on the periphery of a spring net and is converted into a pulling force acting on coil springs and penetrating springs; and then the pulling force is uniformly dispersed to each of the coil springs, so that the local overstressing of the coil springs and the penetrating springs is avoided, thereby preventing the spring net and the penetrating springs from being arched and sunken. As a result, the mattress may keep good elasticity all the time, which further increases the comfort level of the spring mattress. The present solution may alleviate the plastic deformation of the coil springs to further increase the comfort level of the spring mattress and improve the elasticity and durability of the spring mattress.

A foldable tension spring mattress, wherein a vertical pressure is converted into a tension by means of a wrapping blanket; the tension acts on the periphery of a spring net and is converted into a pulling force acting on coil springs and penetrating springs; and then the pulling force is uniformly dispersed to each of the coil springs, so that the local overstressing of the coil springs and the penetrating springs is avoided, thereby preventing the spring net and the penetrating springs from being arched and sunken. As a result, the mattress may keep good elasticity all the time, which further increases the comfort level of the spring mattress. The present solution may alleviate the plastic deformation of the coil springs to further increase the comfort level of the spring mattress and improve the elasticity and durability of the spring mattress.

A sleeping system includes a comfortable layer comprising a plurality of pressure relief springs and a supporting layer arranged under the comfortable layer. The supporting layer includes a plurality of supporting springs corresponding to the plurality of pressure relief springs, each of the plurality of supporting springs is connected with one of the plurality of pressure relief springs to constitute a pair of spring, the supporting springs and the supporting springs forms a plurality of pairs of springs arranged along a length direction and a width direction, each pair of spring has a same size, and a ratio of a length of the supporting spring to a length of the pressure relief spring varies smoothly along the length direction of the sleeping system.

A sleeping system includes a comfortable layer comprising a plurality of pressure relief springs and a supporting layer arranged under the comfortable layer. The supporting layer includes a plurality of supporting springs corresponding to the plurality of pressure relief springs, each of the plurality of supporting springs is connected with one of the plurality of pressure relief springs to constitute a pair of spring, the supporting springs and the supporting springs forms a plurality of pairs of springs arranged along a length direction and a width direction, each pair of spring has a same size, and a ratio of a length of the supporting spring to a length of the pressure relief spring varies smoothly along the length direction of the sleeping system.

A sofa bed includes: a plurality of elastic modules; a body frame having slide rails arranged thereon; and armrest frames disposed at two sides of the body frame along a longitudinal direction of the body frame, respectively. The slide rails on the body frame are configured to enable the plurality of elastic modules to be mounted on the body frame from an outside of the body frame and to slide thereon to predetermined mounting positions, such that the body frame at one side facing the user is provided with the plurality of elastic modules. The angle between the seat and the backrest portion can be locked for improved operation. The elastic modules, which can be easily installed and uninstalled, can improve the comfort of the sofa bed.

A pocket spring string, a pocket spring mattress core and a mattress. The pocket spring string includes: springs; cloth, which is folded and provided with welds to form multiple adjacent pockets, each pocket being provided with an opening, and the springs being received in the pockets respectively; and thread provided to stitch the openings so that the springs are packaged in the pockets in a compressed state. The pocket spring mattress core is formed by connection of the pocket spring strings, and the mattress includes a mattress cover and the pocket spring mattress core. Because the top and/or bottom of each pocket is provided with the opening which is stitched by the thread, when the thread is removed, the springs can be quickly separated from the pockets, so that the metal material and the cloth are separated without any special technical means.

A pocket spring string, a pocket spring mattress core and a mattress. The pocket spring string includes: springs; cloth, which is folded and provided with welds to form multiple adjacent pockets, each pocket being provided with an opening, and the springs being received in the pockets respectively; and thread provided to stitch the openings so that the springs are packaged in the pockets in a compressed state. The pocket spring mattress core is formed by connection of the pocket spring strings, and the mattress includes a mattress cover and the pocket spring mattress core. Because the top and/or bottom of each pocket is provided with the opening which is stitched by the thread, when the thread is removed, the springs can be quickly separated from the pockets, so that the metal material and the cloth are separated without any special technical means.

In order to manufacture an innerspring unit (31) comprising pocketed springs and having an increased stability at its edge regions, in a first step, an innerspring main body (30) comprising a plurality of first strings (14) of pocketed springs is provided. In a subsequent second step, at least one second string (13c, 13d) of pocketed springs is attached to a lateral surface of the innerspring main body (30), so that the at least one second string (13c, 13d) of pocketed springs extends in a longitudinal direction of the innerspring main body (30). The springs (13) of the at least one second string (13c, 13d) of pocketed springs have a spring characteristic or a spring geometry different from the springs of the plurality of first strings of the innerspring main body (30). The at least one second string (13c, 13d) of pocketed springs forms together with the innerspring main body (30) the innerspring unit (31).

In order to manufacture an innerspring unit (31) comprising pocketed springs and having an increased stability at its edge regions, in a first step, an innerspring main body (30) comprising a plurality of first strings (14) of pocketed springs is provided. In a subsequent second step, at least one second string (13c, 13d) of pocketed springs is attached to a lateral surface of the innerspring main body (30), so that the at least one second string (13c, 13d) of pocketed springs extends in a longitudinal direction of the innerspring main body (30). The springs (13) of the at least one second string (13c, 13d) of pocketed springs have a spring characteristic or a spring geometry different from the springs of the plurality of first strings of the innerspring main body (30). The at least one second string (13c, 13d) of pocketed springs forms together with the innerspring main body (30) the innerspring unit (31).

A pocketed spring assembly comprises a plurality of parallel strings of individually pocketed springs. A dimensionally stabilizing substrate is secured to at least some of the strings on one of the top and bottom surfaces of the strings. A scrim sheet is secured to at least some of the strings on an opposed surface of the strings to maintain the positions of the strings. The dimensionally stabilizing substrate is laterally rigid enough to maintain length and width dimensions of the coil spring assembly. However, the dimensionally stabilizing substrate is flexible enough to allow the pocketed spring assembly to be roll packed for shipping.