Plane coil spring

Abstract

To provide a coil spring structure that is a surface support type and does not generate noticeable lateral shaking or creaking noise. [Solution] A flat-type coil spring in which multiple coil springs are arranged in parallel and the ends form a single surface, with two or more coil springs adjacent to one coil spring, and a contact point where adjacent coil springs abut against each other is provided between one revolution of the spiral of any of the adjacent coil springs, and a fixing part is provided to fix the contact point.

Description

[Technical field]

[0001] The present invention relates to a surface-type coil spring, and more particularly to a technology for a coil spring that has a constant spring constant over the entire surface or a spring constant whose elasticity is functionally changed in parts of the surface, and that has little lateral shaking and creaking. [Background technology]

[0002] Conventionally, cushions used for beds and sofas have been known as flat springs made of coil springs, and the most common types of cushions using these springs are the pocket coil type and the bonnell coil type. While the pocket coil method fits the body well, it has the disadvantage of causing some parts to rise and fall significantly. On the other hand, the Bonnell coil method is stable because it provides support over a wide area, but its disadvantages include the tendency for excessive lateral shaking and the annoying creaking noises. What was needed was a structure that would provide surface support while avoiding noticeable lateral shaking or creaking noises.

[0003] Various techniques have been proposed to address these problems. For example, a technique for partially fixing adjacent coil springs together (see Patent Document 1) has been proposed and is known. More specifically, the spring unit is equipped with a spring unit, an elastic member on the upper surface of the spring unit, and an exterior body. The spring unit has a structure in which a large number of barrel-shaped coil springs are arranged in a matrix, and the middle parts of adjacent springs are connected by a helical wire. However, since it is fixed to the adjacent spring at only one point, lateral vibration cannot be sufficiently reduced, and the above problem is not yet solved. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-337234 Summary of the Invention [Problem to be solved by the invention]

[0005] In view of the above problems, the present invention has an object to provide a surface-type coil spring that can provide high cushioning performance while supporting the body over a surface area and eliminating disturbing lateral swaying or creaking noises. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a flat coil spring in which a plurality of coil springs are arranged in parallel, with the ends forming one surface, where two or more coil springs are adjacent to one coil spring, and abutment points where adjacent coil springs abut against each other are provided between one revolution of the spiral of the adjacent coil springs, and a fixing part is provided to fix the abutment points. One of the fixing parts is disposed in the middle part of the coil spring. Take measures.

[0007] In addition, the present invention is a method for determining the direction in which the spiral of the lower end of the coil spring starts relative to the axis of the spiral of the coil spring. position When the coil springs are wound around the coils, the coil springs are arranged so that there is at least one contact point between adjacent coil springs during one revolution of the coil. position The method is to set the following.

[0008] Furthermore, the present invention is a coil spring having a plurality of coil springs arranged in a matrix, and the spiral start of adjacent coil springs is position takes measures that are 180 degrees out of sync.

[0009] Furthermore, the present invention employs a means in which the coil spring comprises a right-handed coil spring and a left-handed coil spring, with adjacent coil springs having different winding directions.

[0010] Furthermore, the present invention is a method for manufacturing a coil spring having a spiral start position where a plurality of coil springs are arranged in a matrix, and adjacent coil springs are arranged in a matrix. position Regarding this, the coil springs in the row direction are oriented in the same direction, and the coil springs in the column direction are rotated by 180 degrees from each other.

[0011] Furthermore, the present invention employs a means configured with coil springs having different spring constants.

[0012] Furthermore, the present invention employs a means in which the fixed portion is fixed by any one of welding, adhesion, resin dipping, and wrapping. Effect of the Invention

[0013] The surface-type coil spring according to the present invention supports the body over a wide area, without disturbing lateral movement or creaking noises, and therefore provides high cushioning performance. [Brief description of the drawings]

[0014] [Figure 1] 1 is an explanatory diagram showing an embodiment of a surface-type coil spring according to the present invention; [Diagram 2] 1 is a perspective view illustrating an embodiment of a surface-type coil spring according to the present invention. FIG. [Diagram 3] 1 is a schematic plan view illustrating an embodiment of a surface-type coil spring according to the present invention. FIG. [Figure 4] 10A and 10B are explanatory diagrams showing another embodiment of the surface-type coil spring according to the present invention. [Diagram 5] FIG. 11 is a plan view showing another embodiment of the surface-type coil spring according to the present invention. [Figure 6] 10A and 10B are explanatory diagrams showing another embodiment of the surface-type coil spring according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The surface-type coil spring according to the present invention has a major feature in that it is capable of eliminating lateral vibration and squeaking noises by using a surface support system. The overall configuration and each part of the surface-type coil spring according to the present invention are not limited to the embodiments described below, but can be modified as appropriate within the scope of the technical concept of the present invention, i.e., within the scope of shapes, dimensions, structures, etc. that can achieve the same functional effects.

[0016] The present invention will be described with reference to FIGS. FIG. 1 shows an embodiment of a surface-type coil spring according to the present invention, where (a) is a perspective view and (b) is a plan view. FIG. 2 is a perspective view for explaining an embodiment of a plane-type coil spring according to the present invention, showing one spiral turn. FIG. 3 is a schematic plan view illustrating an embodiment of a surface-type coil spring according to the present invention, where (a) shows a case where all coil springs are left-handed, and (b) shows a case where right-handed and left-handed coil springs are mixed. FIG. 4 is an explanatory diagram showing another embodiment of the surface-type coil spring according to the present invention, in which (a) is a schematic plan view showing a triangular surface-type coil spring, (b) is a perspective view showing one spiral turn, and (c) is a side view showing one spiral turn. FIG. 5 is a plan view showing another embodiment of the surface-type coil spring according to the present invention, where (a) is a schematic plan view showing a hexagonal surface-type coil spring, and (b) is a schematic plan view showing an octagonal surface-type coil spring. FIG. 6 is an explanatory diagram showing another embodiment of the surface-type coil spring according to the present invention, where (a) is a schematic plan view showing an example in which a small coil spring is arranged around a large coil spring, and (b) is a perspective view thereof.

[0017] The plane-type coil spring 1 is made by arranging a plurality of coil springs in parallel, forming one plane at the ends, and fixing the coil springs 10 together with fixing parts 12. It is mainly used for cushioning in mattresses, beds, etc. The surface-type coil spring 1 used in this embodiment is a resilient member used in mattresses and the like, and is arranged so as to exert an upward resilient force in response to a load applied mainly from above downward. The coil spring used in this embodiment is, for example, cylindrical with a spiral. It may be a square or hexagonal column as long as it has a spiral structure and is columnar and can abut with adjacent coil springs. The material constituting the coil spring is either a metal material such as hard steel wire or stainless steel, or a resin material such as plastic, and is determined according to the product specifications of the coil spring. In addition, since both ends of the coil spring constitute the top and bottom surfaces of the coil spring, the coil spring may be formed with a generally ring-shaped end turn portion 14 such that both ends are perpendicular to the longitudinal direction.

[0018] In the present embodiment, the surface-type coil spring 1 has two or more coil springs 10 adjacent to one coil spring 10, and has a contact point where adjacent springs contact each other between one revolution of the spiral of the adjacent coil springs, and has a fixing part that fixes the contact point. First, an example in which the coil springs 10 are arranged orthogonally and in series and parallel will be described. The coil springs 10 are arranged vertically and horizontally. The portion where the outer circumferences of adjacent coil springs 10 come into contact with each other is called abutment point 11. The abutment point 11 is fixed with a fixing metal fitting 20 or the like to form a fixed portion 12. The fixing metal fitting 20 is, for example, a wire that is wound around and fixed to the contact portion 11. This is just one example, and there are various fixing methods as described later. In principle, all of the contact points 11 between adjacent coil springs 10 are fixed portions 12. By fixing adjacent coil springs 10 to each other, creaking noises that are generated when the coil springs 10 rub against each other are prevented. Furthermore, since the coil springs 10 are supported by a plurality of coil springs 10, lateral displacement of the coil springs 10 can also be reduced.

[0019] A detailed explanation will be given with reference to Figures 1, 2, and 3. Fig. 1(a) is a perspective view showing an example of orthogonally arranged flat coil springs. As an example of a portion of a flat coil spring, 16 coil springs 10 with the same pitch and the same winding direction are shown in a 4x4 arrangement. Each coil spring 10 has contact points 11 in four directions and is fixed to a fixing bracket 20 as a fixed portion 12. 1(b) is a plan view of the orthogonally arranged plane-type coil springs 1. The coil springs 10 are represented by double circles. The fixing brackets 20 are represented by thick lines connecting the double circles of the coil springs 10. 2 is a schematic perspective view of one spiral turn of the coil springs 10 in the orthogonally arranged plane-type coil spring 1. It consists of nine coil springs 10, with the coil spring 10 represented by the thick line in the center designated A, and the coil springs 10 in the orthogonal directions designated B, C, D, and E. The fixing brackets 20 that secure the coil springs 10 together are designated by thick lines. The coil spring 10 has a bottom end 13 formed with a turn seat portion 14 . The numbers marked on the coil indicate the angles of the positions of the contact portion 11 and the fixed portion 12 when one revolution of the spiral from the lower end portion 20 is taken as 0 degrees to 360 degrees. Fig. 3 is a plan view of the orthogonal plane type coil spring 1. It is roughly the same as Fig. 1(b). The point where the spiral of the lower end of the coil spring begins relative to the spiral axis of the coil spring. position Start the spiral position When this is done, the spiral of each coil spring 10 begins. position The angle of the position of the abutment portion 11 and the fixed portion 12 is represented by a number when the angle is set to 0 degrees and one revolution of the spiral from the lower end portion 20 is set to 0 degrees to 360 degrees. The spiral winding direction is marked "right" or "left" in the center of each coil spring 10. The winding direction is also indicated by an arrow.

[0020] As shown in Figure 1(a), adjacent coil springs 10 are fixed at the position of fixing parts 12, approximately the number of revolutions of the spiral. When viewed in a plan view, it looks like Figure 1(b). If coil spring 10 A is used as the reference, coil springs 10 B and D are fixed in the vertical direction on the page, and coil springs 10 C and E are fixed in the horizontal direction, for a total of four directions.

[0021] Here, the contact point will be described in detail. The coil springs 10 are arranged perpendicular to each other, and adjacent coil springs 10 are arranged in four directions around each coil spring 10 so that they abut against each other. However, simply arranging the coil springs 10 may not result in the formation of abutting points. Therefore, in terms of the topological meaning of the spiral of each coil spring 10, the spiral of the lower end of the coil spring starts from the axis of the spiral of the coil spring. position Start the spiral position Let us assume that. For example, the start of a spiral position If coil springs of the same pitch are arranged side by side, the contact point 11 will not occur. In order for adjacent coil springs 10 to have one or more contact points during one revolution of the spiral, the adjacent coil springs must be in contact with each other at the start of the spiral as shown in FIG. position needs to be turned 180 degrees.

[0022] An explanation will be given using examples of arrangements of the coil springs 10, A to E, in FIG. Spiral start of A position (Angle 0 degrees) is the top and bottom of the paper position Next, the spiral start of the adjacent coil spring 10, B, position On the paper position and is shifted by 180 degrees with respect to A. Therefore, the lower end portion which is the spiral start portion of A and the lower end portion which is the spiral start portion of B are at an angle of 0 degrees and therefore abut against each other. In the relationship between A and C, the angle on the C side of A is 90 degrees, and the angle on the A side of C is also 90 degrees, so they abut. Similarly, A and D, and A and E, meet at angles of 180 degrees and 270 degrees, respectively, and come into contact. In this way, when coil springs 10 with the same pitch and the same winding direction are gathered together, the spiral start of adjacent coil springs position By shifting the springs by 180 degrees, it is possible for adjacent springs to come into contact with each other more than once during one revolution of the spiral. FIG. 2 is a perspective view including coil springs 10 A to E. Only one period of each coil spring 10 is shown. A and B abut at an angle of 0 and are fixed by fixing bracket 20 to form fixed part 12. Similarly, A and C abut at an angle of 90 degrees. A and D abut at an angle of 180 degrees. A and E abut at an angle of 270 degrees. In this way, the spiral start of each coil spring 10 position By appropriately setting the above, it is possible to create a flat coil spring with contact points and fixed parts in four directions.

[0023] We will now explain the case where coil springs with both left and right winding directions are used. If only coil springs with either left or right winding directions are used, the direction in which the coils are likely to distort when a lateral force is applied to them will be the same. By using coil springs with both left and right winding directions, the directions in which the coils are likely to distort can be dispersed, resulting in a flat coil spring that is more stable against lateral forces. In Figure 3(b), left-handed and Right-handed 1 shows an example of coil spring arrangement when both coil springs are used. The coil springs 10 are made up of a right-handed spring and a left-handed spring, and adjacent coil springs 10 have different winding directions. Start of spiral of adjacent coil springs position The coil springs in the row direction are all the same position The coil springs in the row are angled 180 degrees apart from each other. An explanation will be given using examples of arrangements of the coil springs 10 shown in FIG. Spiral start of A position The top and bottom of the paper position Next, the spiral start of the adjacent coil spring 10, B, position On the paper position and is shifted by 180 degrees with respect to A. Therefore, the lower end portion which is the spiral start portion of A and the lower end portion which is the spiral start portion of B are at an angle of 0 degrees and therefore abut against each other. In the relationship between A and C, the spiral of C begins position is the same as A, position Since it is right-handed, A position The angle of is 90 degrees. Therefore, it matches and abuts with the 90 degrees of A. Similarly, A and D, and A and E, meet at angles of 180 degrees and 270 degrees, respectively, and come into contact. In this way, when coil springs 10 having the same pitch but different winding directions are collected, as described above, the winding directions and spiral start directions of adjacent coil springs are different. position By adjusting this, it is possible for adjacent springs to come into contact with each other more than once during one revolution of the spiral. In other words, the planar coil spring 1 is composed of a right-handed coil spring 10 and a left-handed coil spring 10, and adjacent coil springs 10 have different winding directions. A plurality of coil springs 10 are arranged in a matrix, and the spiral start points of adjacent coil springs 10 are aligned in a matrix. position The coil springs in the row direction are the same position The coil springs in the row are rotated 180 degrees from each other.

[0024] Thus, the spiral begins position By adjusting the angles of the adjacent coil springs 10, etc., it is possible to match the angles of all the adjacent coil springs 10 to form the fixing portion 12, so that the coil springs 10 can be firmly fixed to each other. In this way, by arranging multiple coil springs in a planar manner, with two or more coil springs adjacent to one coil spring, and having a contact point where adjacent springs abut between one revolution of the spiral of either of the adjacent coil springs, and having a fixing part to fix the contact point, it is possible to create a planar spring that is resistant to lateral shaking and less likely to creak. The spiral start position of a coil spring is the position where the coil spring comes into contact with the adjacent coil spring at least once during one revolution of the spiral. 。 Furthermore, by using coil springs 10 with different spring constants, the elasticity of a portion of the integrated planar coil spring 1 can be changed.

[0025] Methods of fixing at the fixing portion 12 include, for example, welding using metal, bonding with an adhesive, dipping with resin (a processing method in which an object is immersed in liquid resin and then cooled to fix it), melt joining / welding in which heat is applied to plastic to soften / melt it and fix it, and wrapping fixing in which tape is wrapped around the fixing point. In particular, by being fixed by welding, resin dipping, or winding, it is possible to fix without using a special method, which contributes to simplifying the work. Also, when the coil spring expands or contracts, the crossing angle of the fixed part 12 does not change due to the fixation, which may cause a load, but the amount of expansion and contraction of the coil spring 10 depends on the height and number of turns of the coil itself, but for example, even if the coil spring 10 has a diameter of 2 mm, a height of 50 mm, and a number of turns of 4, it is about 10 mm, and it is possible to expand and contract without putting a large load on the fixed part 5 even when the maximum load is applied. Furthermore, when using a resin material such as plastic as the material for the coil spring, rather than stacking the coil springs 10 molded separately and fixing the contact points by melt joining or the like, it is also possible to initially mold the flat coil spring 1 in an overlapping state by bringing the coils into contact with each other through extrusion molding, and it is also possible to employ a form in which the contact points are already fixed during such extrusion molding.

[0026] In this way, according to this embodiment, since multiple coil springs can be integrated into a flat surface, when used in a bed or mattress, it is possible to prevent the occurrence of surface irregularities. Also, by fixing the coil springs together at multiple points, it is possible to suppress the generation of creaking noises and reduce lateral displacement of the coil springs.

[0027] Furthermore, by making the entire mattress out of a single planar coil spring, the effort of lining up the coil springs is eliminated, improving production efficiency.

[0028] Although the coil springs 10 are arranged perpendicular to each other in the above example, they may be arranged in various polygonal shapes such as triangular, hexagonal, octagonal, etc. Examples of arrangements in triangular, hexagonal, and octagonal shapes will be described with reference to Figs. 4, 5, and 6. When the coil springs 10 contact each other in a triangular shape, the coil springs 10 contact each other at an angle of 60 degrees (FIG. 4(a)). In this case, if all three coil springs 10 have the same pitch, one coil spring 10 will not come into contact with the other even if the spiral start position is changed. Therefore, as an example, a case where the pitch of one coil spring 10 is halved will be described. Three coil springs 10 are arranged as A, B, and C as shown in FIG. The pitch of coil spring 10 of A is half that of the other coil springs 10. In other words, compared to two rotations of coil springs 10 of B and C, coil spring 10 of A has one spiral rotation. B and C have the same pitch and the same winding direction (left), and are in contact at an angle of 120 degrees. With respect to A, B needs to be in contact at 60 degrees, and C needs to be in contact at 180 degrees. Position A at an angle of 30 degrees faces B. Because the pitch of A is half that of B, the height of A's angle of 30 degrees corresponds to B's angle of 60 degrees. Therefore, A and B come into contact (T1). In this state, the 90 degree position of A faces the 180 degree position of C. Since the height of the 90 degree angle of A corresponds to the height of the 180 degree angle of C, A and C come into contact (T2). Fig. 4(b) is a perspective view showing the abutting state, and Fig. 4(c) is a side view showing the abutting state. By making the coil spring triangular, the number of coil springs can be reduced, but the coil spring can have a larger receiving area than a normal coil spring.

[0029] Moreover, the cases of a hexagonal shape and an octagonal shape will be described with reference to FIG. The hexagonal shape is similar to the triangular shape described above. In the case of a hexagonal shape, like the case of a triangular shape, it is not possible to make a hexagonal shape with coil springs 10 of the same pitch. It is necessary to include coil springs 10 of different pitches. FIG. 5(a) illustrates an example in which the triangular shape of FIG. 4 is partially used. A, B, and C have the same configuration as in the triangular case. A is right-handed and BG is left-handed. As in the case of the triangle, A is arranged so that a position with a helical angle of 30 degrees faces a position with a helical angle of 60 degrees, and A is arranged so that a position with a helical angle of 90 degrees faces a position with a helical angle of 180 degrees. Also, A is arranged so that a position with a helical angle of 150 degrees faces a position with a helical angle of 300 degrees. With this arrangement, A abuts against the first turn of the spiral of B, C, and D. Similarly, A's helical angle of 210 degrees faces E's helical angle of 60 degrees. At the 180 degrees position, A has the same meaning as 0 degrees relative to E, so it will be 30 degrees instead of 210 degrees. Similarly, F's helical angle of 180 degrees faces A's helical angle of 90 degrees. Also, G's helical angle of 300 degrees faces A's helical angle of 150 degrees. With this arrangement, A abuts the second turn of the spiral of E, F, and G. In this state, if we check the contact state of B through G with respect to each other, B and C are in contact at an angle of 120 degrees, C and D are in contact at an angle of 240 degrees, D and E are in contact at an angle of 0 degrees, E and F are in contact at an angle of 120 degrees, F and G are in contact at an angle of 240 degrees, and G and B are in contact at an angle of 0 degrees. Therefore, A and B through G abut against each other within one revolution of A's spiral, and B through G abut against each other within one revolution of their spiral.

[0030] The hexagonal shape maximizes the density of the coil springs 10. Since the pitch of one of the seven coil springs 10 is half, the spring constant of the other coil springs 10 can be made the same by changing the elastic constant.

[0031] It can also be octagonal, as shown in Figure 5(b). Eight coil springs 10 are arranged around a center point. The spiral start point faces the center, and the right-handed and left-handed coils are arranged alternately. Then, the coils come into contact at angles of 67.5 degrees and 292.5 degrees, forming the contact point 11. Specifically, if the coil spring 10 of A is left-handed, the coil spring 10 of B, which is adjacent to it on the left on the paper, is right-handed, and A and B abut at an angle of 292.5 degrees. The coil spring 10 of C, which is adjacent to A on the right, is clockwise, and A and C abut against each other at an angle of 67.5 degrees. By using the abutment point 11 as the fixed portion 12, the coil spring 10 can be integrated.

[0032] Also, a configuration in which a large coil spring 10 is arranged in the center and small coil springs 10 are arranged around it will be described with reference to FIG. This is the case where eight small springs are arranged. The small springs are arranged in the same manner as in Fig. 5(b). If the large coil spring 10 in the center is designated as A, then A and the surrounding coil springs come into contact in sequence, roughly for each revolution of the spiral. To be precise, if the pitch of the surrounding coil springs is 1, the pitch of A is 7 / 8. Therefore, A contacts the surrounding coil springs every 7 / 8 of a turn. As A completes 8 turns in the spiral, it contacts all 8 surrounding coil springs. Figures 6(a) and (b) show an example in which the coil spring of B first comes into contact with A (T1), and then, when A has completed 7 / 8 of a turn, it comes into contact with the coil spring of C (T2). In this example, the number of surrounding coil springs is eight, but any number greater than or equal to four may be used. With this configuration, the central coil spring can be used as the main spring, and the surrounding coil springs can be used to fine-tune the characteristics.

[0033] In this way, a planar coil spring can be constructed without being limited to a perpendicular shape.

[0034] Moreover, by making all of the contact points into fixed portions, the coil springs can be fixed to each other to the maximum extent possible, which is preferable. Furthermore, by making all the coil springs the same diameter, production control is simplified, and when used in beds and mattresses, layout is simplified and it is convenient. Moreover, by making each coil spring a multiple coil spring made up of a plurality of springs, the characteristics of each coil spring can be preferably changed. Furthermore, when the surface type coil spring 1 is used in a bed or mattress, the characteristics of the surface type coil spring can be changed depending on the position of the bed or mattress, thereby making it possible to provide a comfortable bed or mattress, which is preferable.

[0035] In this way, the planar coil spring according to the present invention can provide high cushioning performance by supporting the body over a surface area while eliminating disturbing lateral shaking and creaking noises.

[0036] Furthermore, by using the contact point where adjacent springs abut between one revolution of the spiral of either of the adjacent coil springs as the fixed part, it is possible to have multiple fixed parts according to the number of turns of the spiral, and therefore the coil springs can be fixed to each other extremely firmly.

[0037] In addition, the starting point of the spiral at the lower end of each coil spring is the axis of the spiral of the coil spring. position The spiral begins position By specifying the above, the contact portion can be accurately controlled.

[0038] In addition, by arranging multiple coil springs in a matrix, it is similar to the layout of a typical coil spring, so it is possible to utilize conventional know-how while still exhibiting the characteristics of a planar coil spring.

[0039] In addition, by using coil springs wound in different directions, the device can be made more resistant to lateral shifting and bending. [Industrial Applicability]

[0040] It is understood that the surface-type coil spring according to the present invention has great industrial applicability as a coil spring with little lateral shaking or creaking. [Explanation of symbols]

[0041] Single-sided coil spring 10 Coil spring 11 Contact point 12 Fixed part 13 Lower end 14 End winding section 20 Fixture

Claims

1. A flat coil spring is a spring in which a plurality of coil springs are arranged in parallel and the ends form a surface. Two or more of the coil springs are adjacent to one of the coil springs, The coil springs each have an abutment point between adjacent coil springs between one turn of the spiral, Hold the fixing part that fixes the relevant contact, A surface-type coil spring, wherein one of the fixing parts is disposed in a middle portion of the coil spring.

2. When the position where the spiral of the lower end of the coil spring starts with respect to the spiral axis of the coil spring is defined as the spiral start position, 2. The surface-type coil spring according to claim 1, characterized in that the spiral start position of each of the coil springs is set so that there is one or more abutment points where adjacent coil springs abut against each other within one revolution of the spiral of any of the adjacent coil springs.

3. A plurality of the coil springs are arranged in a matrix, 3. The surface-type coil spring according to claim 2, wherein the spiral start positions of adjacent coil springs are offset by 180 degrees.

4. The coil spring comprises a right-handed coil spring and a left-handed coil spring, 3. The surface-type coil spring according to claim 2, wherein adjacent coil springs have different winding directions.

5. A plurality of the coil springs are arranged in a matrix, 5. The plane-type coil spring according to claim 4, characterized in that the spiral start positions of adjacent coil springs in the row direction are the same, and the spiral start positions of adjacent coil springs in the column direction are shifted by 180 degrees from each other.

6. 3. The surface-type coil spring according to claim 2, characterized in that the coil springs have different spring constants.

7. 7. The surface-type coil spring according to claim 1, wherein the fixed portion is fixed by any one of welding, adhesion, resin dipping, and winding.

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