A SPRING SYSTEM AND METHOD FOR PRODUCTION OF SPRING SYSTEM

Abstract

A spring unit containing a spring system used in bed, armchair and sofa like constructions and realizing different hardness and comfort levels in different areas of the constructions and having a soft spring forming a soft comfort area of low hardness of the spring unit, a medium hard spring providing gradual transition between soft comfort areas of the spring unit and hard comfort areas with a spring a having number of convolution different from the soft spring and of the same wire diameter, and a hard spring providing hard comfort area of the spring unit by a spring having number of convolution different from the soft spring and medium hard spring and of the same wire diameter as the medium hard spring and soft spring.

Claims

1. A spring unit used in bed, armchair and sofa like constructions and realizing adjustment of different hardness and comfort levels in different areas of said constructions characterized in comprising: at least a soft spring of one single wire diameter forming soft comfort area of low hardness area of said spring unit; at least a medium hard spring providing gradual transition between soft comfort areas of said spring unit and hard comfort areas with a spring having number of convolution different from said soft spring and of same wire diameter; a spring system comprising at least a hard spring providing hard comfort area of said spring unit by means of a spring having number of convolution different from spring of soft spring and medium hard spring and of same wire diameter as said medium hard spring and said soft spring.

2. A spring unit according to claim 1, characterized in comprising at least a medium hard spring having number of convolution smaller than soft spring and bigger than hard spring and which can be in range from 6 to 11.

3. A spring unit according to claim 2, characterized in comprising at least a medium hard spring made from steel material.

4. A spring unit according to claim 1, characterized in comprising at least a soft spring having number of convolution bigger than medium hard spring and hard spring and that can be in range from 7 to 12.

5. A spring unit according to claim 4, characterized in comprising at least a soft spring made from steel material.

6. A spring unit according to claim 1, characterized in comprising at least a hard spring having number of convolution smaller than medium hard spring and soft spring and that can be in range from 5 to 10.

7. A spring unit according to claim 6, characterized in comprising at least a hard spring made from steel material.

8. A spring unit according to claim 1, characterized in comprising at least a soft spring located in proper order fitting different comfort levels along length of said carcass, at least a medium hard spring and at least a hard spring.

9. A method for production of a spring system characterized in comprising the following steps: production of springs from steel wire to form a spring unit at spring machine and placement into nonwoven and bringing into spring strips; while forming spring strips, production of hard springs in each line, in lower number of convolution with same wire diameter and increasing pretension in order to obtain hard comfort area in spring unit; number of convolution is increased one step continuing medium hard springs and forming transition comfort area in the spring unit and thus production of next soft springs in higher number of convolution with same wire diameter and less pretension in order to obtain soft comfort area; repeating mentioned different comfort areas along spring strip in a manner transition comfort area occurs between them; feeding spring strips produced at spring machine to assembling machine in a manner high hard springs are in the beginning of strip; obtaining different comfort areas by gluing pocket spring strips to each other from middle at assembling machine by adding hot melted glue and/or from bottom and top by adding nonwoven, and providing gradual transition between comfort areas.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG. 1 is a front perspective view of the spring unit being subject of the invention,

[0024] FIG. 2 is a view of soft spring located inside spring unit of the invention.

[0025] FIG. 3 is a view of medium hard spring located inside spring unit of the invention.

[0026] FIG. 4 is a view of hard spring located inside spring unit of the invention.

[0027] FIG. 5 is a graphic showing pressure distribution of pocket spring unit of the invention under 30% and 45% pressure, produced from spring strips by step by step changing number of convolution of springs of 1.80 mm wire diameter.

[0028] FIG. 6 is a graphic showing pressure distribution of five comfort zone spring unit of current art under 30% and 45% pressure produced by use of springs of 2.00 mm and 1.80 mm wire diameters.

DESCRIPTION OF PART REFERENCES

[0029] 1. Spring unit [0030] 10. Spring system [0031] 10.1 soft spring [0032] 10.2. medium hard spring [0033] 10.3 hard spring

[0034] The drawings are not necessarily to be scaled and the details not necessary for understanding the present invention might have been neglected. In addition, the components which are equivalent to great extent at least or have equivalent functions at least have been assigned the same number.

DETAILED DESCRIPTION OF THE INVENTION

[0035] In this detailed description, the preferred embodiments of the invention have been described in a manner not forming any restrictive effect but only for purpose of better understanding of the matter.

[0036] The spring unit (1) disclosed under the invention used in bed, armchairs and sofa like constructions and wherein different hardness and comfort levels in different areas are provided by springs of same wire diameter size and different convolution numbers and consist of nonwoven located inside the spring system (10).

[0037] Said spring system (10) consists of at least a soft spring (10.1), at least a medium hard spring (10.2) and at least a hard spring (10.3) having different number of convolution in comparison to single wire diameter and hardness intended to be obtained.

[0038] Said soft spring (10.1) is made from steel material and has a number of convolution between 7 and 12, preferably 8 and constitutes comfort area of spring unit (1) having low hardness (soft), and has higher number of convolution when compared to other springs.

[0039] Said medium hard spring (10.2) is made from steel and has number of convolution between 6 to 11, preferably 7. It provides transition between soft comfort areas and hard comfort areas of the spring unit (1) and is of same wire diameter as springs forming other comfort areas have. Number of convolution is such that it corresponds to average of number of turning of springs forming other comfort areas. It makes spring unit ergonomic by providing gradual comfort area transition between different comfort areas of the spring unit (1).

[0040] Said hard spring (10.3) is made from steel material and has a number of convolution between 5 and 10, preferably 6 and constitutes hard comfort area of spring unit (1), and has less number of convolution when compared to other springs.

[0041] The spring unit (1) disclosed under the invention provides different hardness and comfort levels in different areas of spring system (10) formed by springs of single wire diameter by gradually changing number of convolution of spring and thus bringing the obtained spring strips together.

[0042] Soft springs (10.1), medium hard springs (10.2) and hard springs (10.3) of said spring unit (1) are assembled along length of the spring unit (1) and thus different comfort areas are obtained.

[0043] By use of spring machines having servo motor controlling capability, initially hard springs (10.3) produced by increasing pretension where number of convolution is low, then number of convolution is increased one step and thus medium hard springs (10.2) are produced and then soft springs (10.1) with high number of convolution and decreasing pretension are produced and thus spring system (10) consisting of springs placed inside nonwoven is obtained. Spring groups (10.1 and 10.3) of different hardness in spring system (10) are provided by placing medium hard springs (10.2) providing formation of transition comfort between them and repeating said operation.

[0044] High pretension hard springs (10.3) having lower number of convolution are placed in front of the sequence to feed the assembling machine in the pocket spring unit produced in this way.

[0045] Spring system (10) in length corresponding to length of spring unit (1) are assembled in width direction of the spring unit (1) by adding hot melted glue to the center and/or to bottom and top by use of additional nonwoven in the assembling machine and thus produced with different comfort area and gradual transition between comfort areas.

[0046] Method for production of spring system (10) disclosed under the invention consists of process steps of [0047] production of springs (10.1-10.2-10.3) from steel wire to form spring unit (1) at spring machine and placement into nonwoven and bringing into spring strips, [0048] While forming spring strips, production of hard springs (10.3) in each line, in lower number of convolution with same wire diameter and increasing pretension to obtain hard comfort area of the spring unit (1), [0049] Number of convolution is increased one step continuing medium hard springs (10.2) and forming transition comfort area in the spring unit (1) and thus production of next soft springs (10.1) in number of convolution with same wire diameter and less pretension in order to obtain soft comfort area, [0050] Repeating mentioned different comfort areas along spring strip in a manner transition comfort area occurs between them [0051] Feeding spring strips produced at spring machine to assembling machine in a manner springs of high hardness are in the beginning [0052] Obtaining different comfort areas by gluing pocket spring strips to each other from centre at assembling machine by adding hot melted glue and/or from bottom and top by adding nonwoven, and providing gradual transition between comfort areas.

[0053] In a preferred embodiment of the invention, gluing pocket spring strips to each other at assembling machine from centre and/or from bottom and top by adding interlining is made by hot melt glue system.