CN211911104U - Spring device, spring string and spring core - Google Patents

Abstract

The utility model discloses a spring assembly, spring cluster and spring core, spring assembly includes outer spring, inner spring and sack, the outer spring housing is established the inner spring outside, the sack cover is established the outer spring outside is in order to constitute bagged spring, the sack has the welding seam that extends from the extroversion inwards and is located the first concave part and the second concave part of both sides of welding seam. The utility model discloses a spring assembly can avoid or at least noise reduction and reduce the possibility of intertwine between the spring to improve the product quality of spring core, guarantee that the user uses the impression.

Description

Spring device, spring string and spring core

Technical Field

The utility model relates to a technical field is made to the spring, more specifically relates to a spring assembly, have this spring assembly's spring cluster and have the spring core of this spring cluster that are used for mattress, sofa or seatpad.

Background

Springs are widely used in the production of the spring core (which may also be referred to as a bed core, sofa core or seat core) of a mattress or cushion, and compound springs may increase the strength of the spring core and typically comprise a plurality of coil springs nested one within the other, i.e. one coil spring is nested over the other. In the production of the spring core of a mattress or cushion, multiple springs are typically enclosed in individual pockets of a spring pocket to form a string of springs, and a plurality of strings of springs are joined together to form the mattress or cushion.

SUMMERY OF THE UTILITY MODEL

The present application is based on the discovery and recognition by the inventors of the following facts and problems:

the inventors of the present application have recognized that, in the case of a spring core made of a multiple spring, when a person shakes, applies a load thereon, or removes a load thereon, for example, when the person turns over on or gets from a mattress, friction and collision between the multiple springs of the multiple spring easily occur, resulting in unpleasant noise. Further, when the spring is violently conveyed or moved, the plurality of springs are likely to be entangled with each other. Therefore, the quality of the product is affected, and the user experience is further affected.

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. To this end, an aspect of the present invention provides a spring device that can avoid or at least reduce noise and can avoid or at least reduce the possibility of intertwining between springs.

The utility model discloses another aspect has still provided a spring cluster.

The utility model discloses still provide a spring core on the other hand.

According to the utility model discloses a spring assembly of the embodiment of first aspect includes outer spring, inner spring and sack, the outer spring housing is established the inner spring outside, the sack cover is established outside the outer spring in order to constitute bagged spring, the sack has the welding seam that extends from outside to inside and is located the first concave part and the second concave part of both sides of welding seam.

According to the utility model discloses spring assembly, through first concave part and the second concave part that the welding seam that forms the outside-in extension on the sack outside the outer spring and be located the welding seam both sides, welding seam, first concave part and second concave part have restricted the space in the outer spring, can prevent that the inner spring from rocking to avoid or at least noise reduction, and can avoid or reduce the possibility of intertwining between inner spring and the outer spring at least.

In some embodiments, the cloth bag has a welded section extending in a circumferential direction of the cloth bag before the weld is formed, the welded section is divided into a first section and a second section, and the weld is formed by pressing and welding the first section and the second section together.

In some embodiments, the weld extends radially outward and inward of the outer spring.

In some embodiments, an inner end of the weld extends substantially to a central axis of the inner spring.

In some embodiments, the weld extends from the outside inward and is offset from the central axis of the outer spring.

In some embodiments, the weld is a plurality of welds, the plurality of welds being spaced apart from one another.

In some embodiments, a plurality of the welding lines are arranged at intervals from each other in a height direction of the outer spring and in a circumferential direction of the cloth bag.

In some embodiments, a plurality of the welding seams are provided in pairs, each pair of welding seams being arranged oppositely in a radial direction of the outer spring.

In some embodiments, an inner bottom of the first groove portion and the second groove portion abuts against the inner spring.

In some embodiments, the first and second groove portions are both generally scalloped.

In some embodiments, the inner spring is coupled to the outer spring.

In some embodiments, the height of the inner spring is less than the height of the outer spring and neither the first end nor the second end of the inner spring extends beyond the outer spring.

In some embodiments, the first end of the inner spring and the first end of the outer spring are flush and connected to each other.

In some embodiments, the outer spring and the inner spring are integrally made from a single piece of wire.

In some embodiments, the outer spring and the inner spring are coaxial.

According to the utility model discloses a spring string of the embodiment of second aspect includes a plurality of spring assembly, spring assembly be the spring assembly of any preceding embodiment, wherein a plurality of spring assembly's sack is formed through forming a plurality of axial welding seams that are spaced apart from each other along the length direction of this spring string on single non-woven sack, the axial welding seam is followed the axial extension of outer spring.

In some embodiments, the welds of two adjacent spring devices are in one-to-one correspondence and the welds corresponding to each other are aligned in the length direction of the spring string.

In some embodiments, a portion of the welds that correspond to each other abut each other and are integrally formed.

According to the utility model discloses a spring core of the embodiment of third aspect includes a plurality of spring clusters, the spring cluster be above-mentioned any embodiment the spring cluster, it is a plurality of the spring cluster is connected each other, every along transverse arrangement and between the adjacent spring cluster the spring cluster is along longitudinal extension.

Drawings

Fig. 1 is a structural view of a spring device according to an embodiment of the present invention.

Fig. 2 is a structural view of the spring device in fig. 1, and shows the pressing direction during the formation of the weld.

Fig. 3 is a schematic structural diagram of the cooperation of the inner spring and the outer spring of the spring device according to the embodiment of the present invention.

Fig. 4 is a front view of the spring device of fig. 1.

Fig. 5 is a structural view of a spring device according to another embodiment of the present invention.

Fig. 6 is a schematic structural diagram of a spring string according to an embodiment of the present invention.

Fig. 7 is a front view of a spring string according to another embodiment of the present invention.

Fig. 8 is a front view of a spring string according to yet another embodiment of the present invention.

Fig. 9 is a schematic structural diagram of a spring core according to an embodiment of the present invention.

Reference numerals:

the spring device comprises a spring core body 100, a spring string 101, a non-woven cloth bag 1011, an axial weld 1012, a spring device 1, an outer spring 11, an inner spring 12, a cloth bag 13, a weld 131, a first groove portion 132 and a second groove portion 133.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

A spring device according to an embodiment of the present invention is described below with reference to fig. 1 to 5.

As shown in fig. 1 to 5, the spring device 1 according to the embodiment of the present invention includes an outer spring 11, an inner spring 12, and a cloth bag 13, wherein the outer spring 11 is sleeved outside the inner spring 12, and the cloth bag 13 is sleeved outside the outer spring 11 to form a bagged spring. In other words, the spring device 1 is a pocket spring, and the pocket 13 of the pocket spring is filled with the outer spring 11 and the inner spring 12, wherein the inner spring 12 is located inside the outer spring 11. In particular, the outer spring 11 and the inner spring 12 may be coaxially arranged.

The cloth bag 13 has a weld 131 extending from the outside inward and a first groove portion 132 and a second groove portion 133 located at both sides of the weld 131. In other words, the cloth bag 13 is formed with a weld 131 extending from the outside to the inside, a first groove portion 132, and a second groove portion 133, wherein the first groove portion 132 and the second groove portion 133 are spaced apart by the weld 131.

According to the utility model discloses spring assembly 1, through form the first concave part 132 and the second concave part 133 that weld 131 and lie in weld 131 both sides from the outside-in welding seam 131 that extends on the sack 13 of cover outside outer spring 11, weld 131, first concave part 132 and second concave part 133 have restricted the space in outer spring 11, can prevent that inner spring 12 from rocking to avoid or at least noise reduction, and can avoid or reduce the possibility of intertwining between inner spring 12 and the outer spring 11 at least.

In some embodiments, the cloth bag 13 has a welded section extending along the circumference of the cloth bag 13 before the weld 131 is formed, the welded section being divided into a first section and a second section, the weld 131 being formed by pressing and welding the first and second sections together. In other words, before the weld 131, the first groove portion 132, and the second groove portion 133 are not formed on the cloth bag 13, the cloth bag 13 has a section extending in the circumferential direction of the cloth bag 13, and the dimension of the section in the up-down direction (the height direction of the spring device 1) is much smaller than the dimension of the cloth bag 13 in the up-down direction. Wherein the one section has two side sections in the circumferential direction of the cloth bag 13, the two side sections are pressed inward to stack the two side sections of the one section together, and the two side sections are welded, so that a weld 131 is formed at the welded part, and a first groove portion 132 and a second groove portion 133 are formed at the weld 131, wherein the pressing direction of the two side sections is shown by arrows in fig. 2.

In some embodiments, the weld 131 extends radially from the outside to the inside of the outer spring 11. In other words, the extending direction of the weld 131 is the radial direction of the outer spring 11. It will be appreciated that the weld 131 may also extend in a radial direction of the inner spring 12.

Specifically, the inner end of weld 131 extends generally to the central axis of inner spring 12. In other words, the weld 131 extends from the outside inward to the center axis of the inner spring 12.

It is understood that the weld 131 of the present application is not limited to extending radially of the outer spring 11, for example, in some embodiments, the weld 131 extends from the outside inward and is offset from the central axis of the outer spring 11. In other words, the weld 131 does not extend in the radial direction of the outer spring 11.

In some embodiments, as shown in fig. 1, 4 and 5, the weld 131 is multiple, and the multiple welds 131 are spaced apart from each other. In other words, the cloth bag 13 of the spring device 1 has a plurality of welding seams 131, and the welding seams 131 are spaced apart. It will be appreciated that one weld 131 corresponds to one first groove portion 132 and one second groove portion 133, and therefore, the cloth bag 13 of the spring device 1 also has a plurality of first groove portions 132 and a plurality of second groove portions 133.

In some specific embodiments, the plurality of welding lines 131 are arranged at intervals from each other in the height direction of the outer spring 11 and in the circumferential direction of the cloth bag 13. As shown in fig. 1 and 3, the height direction of the spring device 1 is the vertical direction, that is, the height direction of the outer spring 11 is the vertical direction. The cloth bag 13 of the spring device 1 is provided with two welding seams 131, and the two welding seams 131 are spaced in the up-down direction and in the circumferential direction of the cloth bag 13.

Further, the two springs 131 are also spaced apart in the radial direction of the outer spring 11.

It is to be understood that the plurality of welds 131 are not limited to the two shown in fig. 1 and 3, and may be three or more than three.

In some specific embodiments, a plurality of welding seams 131 are provided in pairs, each pair of welding seams 131 being arranged opposite to each other in the radial direction of the outer spring 11. Further, two adjacent pairs of welds 131 are arranged at intervals in the height direction of the outer spring 11. As shown in fig. 4, each pair of the plurality of welding seams 131, in other words, each pair of welding seams 131 includes two welding seams 131, the two welding seams 131 are spaced apart in the circumferential direction of the cloth bag 13 and are oppositely arranged in the radial direction of the outer spring 11, wherein the adjacent two pairs of welding seams 131 are spaced apart in the up-down direction. Specifically, the cloth bag 13 of the spring device 1 has two pairs of four welding seams 131, each two welding seams 131 is a pair, the two pairs of welding seams 131 are spaced apart in the up-down direction, one welding seam 131 of one pair is arranged opposite to one welding seam 131 of the other pair in the up-down direction, and the other welding seam 131 of the one pair is arranged opposite to the other welding seam 131 of the other pair in the up-down direction.

In some embodiments, the inner bottoms of the first and second groove portions 132 and 133 abut against the inner spring 12. In other words, the inner surface of the portion of the cloth bag 13 surrounding the first groove portion 132 and the inner surface of the portion surrounding the second groove portion 133 contact the inner spring 12 to further prevent the inner spring 12 from shaking.

In some embodiments, first and second groove portions 132, 133 are each generally scalloped. In other words, the first groove portion 132 and the second groove portion 133 are each substantially fan-shaped in cross section of the spring device 1 at the first groove portion 132 and the second groove portion 133.

In some embodiments, the height of the inner spring 12 is less than the height of the outer spring 11 and neither the first end nor the second end of the inner spring 12 extends beyond the outer spring 11. As shown in fig. 3, the dimension of the inner spring 12 in the up-down direction is smaller than the dimension of the outer spring 11 in the up-down direction, and the upper end of the inner spring 12 does not protrude beyond the upper end of the outer spring 11, and the lower end of the inner spring 12 does not protrude beyond the upper end of the outer spring 11.

Specifically, a first end of the inner spring 12 is flush with a first end of the outer spring 11, and a second end of the outer spring 11 is higher than the second end of the inner spring 12. As shown in fig. 3, the lower end of the inner spring 12 is flush with the lower end of the outer spring 11, and the upper end of the outer spring 11 is higher than the upper end of the inner spring 12.

It will be appreciated that when the load on the spring means 1 is small, the outer spring 11 supports this small load; when the load on the spring device 1 is large, the outer spring 11 and the inner spring 12 can jointly support the large load.

In some embodiments, the inner spring 12 is connected to the outer spring 11. In other words, the inner spring 12 is located inside the outer spring 11, and the inner spring 12 is connected to the outer spring 11.

Specifically, a first end of the inner spring 12 and a first end of the outer spring 11 are connected to each other. As shown in fig. 3, the lower end of the inner spring 12 and the lower end of the outer spring 11 are flush and connected to each other.

Further, the outer spring 11 and the inner spring 12 are integrally made of a single wire, i.e., the outer spring 11 and the inner spring 12 are integrally formed. It will be understood that when the spring device 1 comprises a plurality of springs which are nested one after the other, the plurality of springs are integrally formed from a single piece of wire.

In some embodiments, at least one of the outer spring 11 and the inner spring 12 is an open spring with an open end-turn or a knotted spring with a closed end-turn. It is understood that the outer spring 11 may be an open end face coil spring and may also be a knotting end face coil spring, and the present invention is not limited thereto, and/or the inner spring 12 may be an open end face coil spring and may also be a knotting end face coil spring. Here, "end face ring opening" means that the end face ring is not connected to the adjacent ring, and the end of the end face ring is spaced apart from the adjacent ring; by "end face loop closed" is meant that the end face loop is connected to an adjacent loop, for example, by knotting the ends of the end face loop over the adjacent loop to effect connection of the end face loop and the adjacent loop to form a knotted spring.

A spring device according to an embodiment of the invention is described below with reference to fig. 1-4.

As shown in fig. 1-4, the spring device 1 according to the embodiment of the present invention includes an outer spring 11, an inner spring 12 and a cloth bag 13, wherein the outer spring 11 is disposed in the cloth bag 13, the inner spring 12 is disposed in the outer spring 11 and coaxially disposed, a lower end of the inner spring 12 is connected to a lower end of the outer spring 11, and an upper end of the inner spring 12 does not extend out of an upper end of the outer spring 11. Specifically, the inner spring 12 and the outer spring 11 are integrally made of one piece of wire.

The cloth bag 13 is formed with a weld 131 extending from the outside to the inside in the radial direction of the outer spring 11, a first groove portion 132, and a second groove portion 133, wherein the first groove portion 132 and the second groove portion 133 are spaced apart by the weld 131. Specifically, the cloth bag 13 has, before the formation of the weld 131, a welded section extending in the circumferential direction of the cloth bag 13, the dimension of which in the up-down direction is much smaller than the dimension of the cloth bag 13 in the up-down direction, and the welded section is divided into a first section and a second section arranged in this order in the circumferential direction of the cloth bag 13, the first section and the second section are pressed inward to press the first section and the second section together to form a first groove portion 132 and a second groove portion 133 on the cloth bag 13, and the pressed first section and the pressed second section are welded to form the weld 131.

Each cloth bag 13 is provided with a first welding line 131 and a second welding line 131, the first welding line 131 and the second welding line 131 are arranged at intervals in the up-down direction and in the circumferential direction of the cloth bag 13, and are also arranged at intervals in the radial direction of the outer spring 11.

A spring device according to another embodiment of the present invention will be described with reference to fig. 1 to 3 and fig. 5.

As shown in fig. 5, and referring to fig. 1 to 3, a spring device 1 according to an embodiment of the present invention includes an outer spring 11, an inner spring 12, and a cloth bag 13. Wherein the outer spring 11 is arranged in the cloth bag 13, the inner spring 12 is positioned in the outer spring 11 and is coaxially arranged, the lower end of the inner spring 12 is connected with the lower end of the outer spring 11, and the upper end of the inner spring 12 does not extend out of the upper end of the outer spring 11. The cloth bag 13 is formed with a weld 131 extending from the outside to the inside in the radial direction of the outer spring 11, a first groove portion 132, and a second groove portion 133, wherein the first groove portion 132 and the second groove portion 133 are spaced apart by the weld 131.

Each cloth bag 13 is provided with a first pair of welding seams 131 and a second pair of welding seams 131, the first pair of welding seams 131 and the second pair of welding seams 131 are spaced in the up-down direction and respectively comprise two welding seams 131, and the two welding seams 131 in each pair of welding seams 131 are oppositely arranged in the radial direction of the outer spring 11.

The other construction and operation of the spring device 1 shown in fig. 5 can be the same as in the embodiment shown in fig. 4 and will not be described in detail here.

A spring string according to an embodiment of the present invention is described below with reference to fig. 1 to 8.

As shown in fig. 1 to 8, the spring string 101 according to the embodiment of the present invention includes a plurality of spring devices 1, and the spring device 1 is the spring device 1 of any of the above embodiments, wherein the cloth bags 13 of the plurality of spring devices 1 are formed by forming a plurality of axial welds 1012 spaced apart from each other in the length direction of the spring string 101 on a single non-woven cloth bag 1011, and the axial welds 1012 extend in the height direction of the outer spring 11.

In other words, during the production process, a plurality of cup springs (springs including the inner spring 12 and the outer spring 11) are sequentially conveyed into the single non-woven fabric bag 1011 along the conveying direction, and the plurality of cup springs are arranged at intervals in the non-woven fabric bag 1011. The individual non-woven cloth bag 1011 is sealed by a sealing device between each two adjacent cup springs to form a plurality of axial welds 1012 extending in the height direction of the cup springs, whereby each cup spring is sealed in a separate pocket, i.e. the inner space of the cloth bag 13 in the spring device 1. Thus, the pockets 13 of the plurality of spring devices 1 in the spring string 101 are not formed independently, but are formed by welding a single non-woven pocket 1011 to form axial welds 1012 separating adjacent nested springs.

In some embodiments, the welds 131 of two adjacent spring devices 1 are aligned in the length direction of the spring string 101, with one weld 131 corresponding to each other. As shown in fig. 6 and 7, the cloth bag 13 of each spring device 1 in the spring string 101 has a first welding line 131 and a second welding line 131, and the first welding line 131 and the second welding line 131 are spaced apart from each other in the up-down direction and the circumferential direction of the cloth bag 13. The first welding seams 131 on the cloth bags 13 of any two adjacent spring devices 1 in the spring string 101 correspond to each other and are aligned in the left-right direction, and the second welding seams 131 on the cloth bags 13 of any two adjacent spring devices 1 in the spring string 101 correspond to each other and are aligned in the left-right direction.

Wherein in the embodiment shown in fig. 6, the first welding seam 131 on the cloth bag 13 of one spring device 1 of any two adjacent spring devices 1 in the spring string 101 is located above the second welding seam 131, and the first welding seam 131 is located at the right side of the second welding seam 131; the first welding line 131 on the cloth bag 13 of another spring device 1 of any two adjacent spring devices 1 is located above the second welding line 131 on the cloth bag 13, and the first welding line 131 is located at the left side of the second welding line 131, so that the first welding line 131 of the one spring device 1 is adjacent to the first welding line 131 of the another spring device 1, and the second welding line 131 of the one spring device 1 is far away from the second welding line 131 of the another spring device 1.

Wherein in the embodiment shown in fig. 7, the first welding seam 131 on the cloth bag 13 of one spring device 1 of any two adjacent spring devices 1 in the spring string 101 is located above the second welding seam 131, and the first welding seam 131 is located at the left side of the second welding seam 131; the first welding line 131 on the cloth bag 13 of another spring device 1 of any two adjacent spring devices 1 is located above the second welding line 131 on the cloth bag 13, and the first welding line 131 is located at the right side of the second welding line 131, so that the first welding line 131 of the one spring device 1 and the first welding line 131 of the another spring device 1 are arranged away from each other, and the second welding line 131 of the one spring device 1 and the second welding line 131 of the another spring device 1 are arranged adjacent to each other.

In some specific embodiments, a portion of the welds 131 that correspond to each other abut each other and are integrally formed. Specifically, as shown in fig. 6 and 7, the welding beads 131 arranged adjacent to each other are connected to each other, and the welding beads 131 arranged adjacent to each other are formed by performing one welding by the same welding apparatus.

As shown in fig. 6, the first weld 131 of one spring device 1 and the first weld 131 of the other spring device 1 of any two adjacent spring devices 1 are connected to and integrally formed with each other. As shown in fig. 7, the second welding line 131 of one spring device 1 and the second welding line 131 of the other spring device 1 in any two adjacent spring devices 1 are connected to each other and integrally formed.

It is understood that the present application is not limited thereto, for example, as shown in fig. 8, each spring device 1 in the spring string 101 is the spring device 1 shown in fig. 5, that is, the cloth bag 13 of each spring device 1 includes a first pair of welding seams 131 and a second pair of welding seams 131, wherein each of the first pair of welding seams 131 and the second pair of welding seams 131 includes two welding seams 131 oppositely arranged in the radial direction of the outer spring 11, and the first pair of welding seams 131 and the second pair of welding seams 131 are arranged at intervals in the up-down direction.

The first pair of welds 131 of the plurality of spring devices 1 in the spring string 101 are aligned in the left-right direction, and the second pair of welds 131 of the plurality of spring devices 1 in the spring string 101 are also aligned in the left-right direction.

A spring core according to an embodiment of the present invention is described below with reference to fig. 1 to 9.

As shown in fig. 9, the spring core 100 according to the embodiment of the present invention includes a plurality of spring strings 101, the plurality of spring strings 101 are arranged in a transverse direction and connected to each other between the adjacent spring strings 101, and each spring string 101 extends in a longitudinal direction. As shown in fig. 1-9, the spring string 101 in the spring core 100 is the spring string 101 of any of the embodiments described above. Wherein adjacent spring strings 101 are connected by the cloth bag 13 of the spring device 1. It is understood that the spring core 100 may be used as a core for a mattress, sofa cushion, seat cushion, or the like.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (19)

1. A spring device is characterized by comprising an outer spring, an inner spring and a cloth bag, wherein the outer spring is sleeved outside the inner spring, the cloth bag is sleeved outside the outer spring to form a bagged spring, and the cloth bag is provided with a welding line extending from outside to inside and a first groove portion and a second groove portion which are positioned on two sides of the welding line.

2. The spring device of claim 1, wherein said cloth bag has a welded section prior to formation of said weld, said welded section extending circumferentially of said cloth bag, said welded section being divided into a first section and a second section, said weld being formed by pressing and welding said first and second sections together.

3. The spring arrangement of claim 1, wherein the weld extends radially outward and inward of the outer spring.

4. The spring device of claim 3, wherein an inner end of the weld extends substantially to a central axis of the inner spring.

5. The spring assembly of claim 1 wherein said weld extends from an outer side to an inner side and is offset from a central axis of said outer spring.

6. The spring device of claim 1, wherein said weld is a plurality of welds, said plurality of welds being spaced apart from one another.

7. The spring device according to claim 6, wherein a plurality of the welds are arranged at intervals from each other in a height direction of the outer spring and a circumferential direction of the cloth bag.

8. The spring device according to claim 6, wherein a plurality of the welding seams are provided in pairs, each pair being arranged oppositely in a radial direction of the outer spring.

9. The spring device of claim 1, wherein an inner bottom of the first and second groove portions abuts the inner spring.

10. The spring device of claim 1, wherein the first and second groove portions are each generally sector-shaped.

11. The spring device of claim 1, wherein the inner spring is coupled to the outer spring.

12. The spring device of claim 11, wherein the height of the inner spring is less than the height of the outer spring and neither the first end nor the second end of the inner spring extends beyond the outer spring.

13. The spring device of claim 12, wherein the first end of the inner spring and the first end of the outer spring are flush and connected to each other.

14. The spring device of claim 11, wherein the outer spring and the inner spring are integrally formed from a single piece of wire.

15. The spring device according to any one of claims 1-14, wherein said outer spring and said inner spring are coaxial.

16. A spring string, comprising a plurality of spring means according to any one of claims 1 to 15, wherein the pockets of a plurality of said spring means are formed by forming a plurality of axial welds on a single nonwoven pocket spaced from each other along the length of the spring string, said axial welds extending in the axial direction of the outer spring.

17. The spring string according to claim 16, wherein the welds of two adjacent spring devices are aligned in a length direction of the spring string in a one-to-one correspondence and in correspondence with each other.

18. The spring string of claim 17 wherein a portion of the welds that correspond to each other abut each other and are integrally formed.

19. A spring core comprising a plurality of spring strings according to any one of claims 16 to 18, the plurality of spring strings being arranged in a transverse direction and being connected to each other between adjacent spring strings, each of the spring strings extending in a longitudinal direction.

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