JPH0970337A - Spring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spring device which improves assembly performance and supporting performance against load. SOLUTION: In a spring device composed by arranging multiple springs in a row and connecting them with a helical wire, a pair of spirals 3 separated at a prescribed spacing with the axis nearly in parallel and a pair of connecting rods 5, 6 which are positioned at one and the other ends in a cross direction which crosses the separation direction of the paired spirals and connect the upper and lower end of the paired spirals are formed continuously of a single steel wire. A plurality of springs join the longitudinal end along the separation direction of the paired spirals in either of the transverse or longitudinal direction, and arranged separatatly a prescribed interval in the other direction, and the joined longitudinal ends are connected by a helical wire 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring device formed by arranging a plurality of spring bodies in a matrix.

[0002]

2. Description of the Related Art For example, in a bed mattress, a spring device is formed by arranging a number of coil springs as a spring body in a matrix and connecting them by a helical wire. −
It is formed by polymerizing a sheet-like elastic material such as rubber and covering the polymer with a bag-shaped exterior material.

In the spring device having the above structure, a large number of independent coil springs are arranged in a matrix, and the upper end surface and the lower end surface of these coil springs are connected by a helical line in the row direction or the column direction, respectively. Since it had to be done, it took a lot of time and effort for the assembly work, and the productivity was sometimes poor.

In order to solve this problem, a single steel wire is bent to connect a plurality of spiral parts whose axes are substantially parallel to each other and the upper and lower ends of adjacent spiral parts. A spring body formed by continuously forming a connecting rod portion has been put into practical use. Japanese Patent Application No. 56-149789 is a prior art showing such a spring body.

Since the conventional spring body having the above-mentioned structure is formed to have a length over the entire length of the spring device in the row direction or the column direction, it is inevitable that the spring body becomes long. For example, when the spring body is formed to have a length corresponding to a row direction which is a longitudinal direction of the spring device, one spring body has 16 to 18 spiral portions.

However, when a spring body having a large number of spiral portions is formed by a single steel wire, it is difficult for the axis lines of the respective spiral portions to point in the same direction, and a large twist occurs in the spring body as a whole. is there. Therefore, when a plurality of twisted spring bodies are connected by a helical wire, it is necessary to correct the twist of the spring bodies, which may result in very poor workability.

Further, in the conventional spring body, one end side in the width direction where the connecting rod portion connecting the upper ends of the adjacent spiral portions and the connecting rod portion connecting the lower ends intersects the juxtaposed direction of the spiral portions. Was formed to be located at. That is, the upper and lower connecting rods are provided in the same width direction of the spring body.

Therefore, when a compressive load is applied to the spring body and the helical portion is compressed and deformed, the spring body receives a larger compressive load than the other end side in the width direction where the connecting rod portion is provided, The axis of the spiral portion is easy to bend. As a result, since the upper surface of the spring body is inclined, the supporting state by the upper surface may become unstable.

[0009]

As described above, since the conventional spring body is formed to have the length corresponding to the row direction or the column direction of the spring device, one spring body is provided with many spiral portions. To be When the number of spiral portions increases, the spring body is likely to be twisted in the width direction. Therefore, when assembling in a matrix, it is necessary to correct the twist, so that the assembly work may be troublesome.

Further, since the connecting rods connecting the adjacent spiral parts are provided in the same direction in the width direction of the spring body at the upper end and the lower end of the spiral part, the spiral part bends when a compressive load is applied. It was easy to do.

The present invention has been made in view of the above circumstances. An object of the present invention is to assemble by using a spring body which is less likely to be twisted and whose spiral portion is less likely to bend with a compressive load. Another object of the present invention is to provide a spring device that is easy and has a stable supporting state.

[0012]

In order to solve the above-mentioned problems, the present invention has a plurality of spring bodies arranged side by side in a matrix,
In a spring device configured by connecting these spring bodies with a helical wire, the spring body intersects with a pair of spiral portions spaced apart at a predetermined interval with their axes substantially parallel to each other, and a separation direction of the pair of spiral portions. A pair of connecting rods located at one end and the other end in the width direction and respectively connecting the upper end and the lower end of the pair of spiral parts are continuously formed by one steel wire, and the plurality of spring bodies are , The longitudinal ends along the separating direction of the pair of spiral portions are joined in one of the row direction or the column direction, and the side portions in the width direction are arranged in the other direction with a predetermined spacing therebetween.
It is characterized in that the joined longitudinal ends are connected by the helical wire.

The spring body consisting of a pair of spiral portions is less likely to be twisted as a whole, and the connecting rods connecting the upper and lower ends of these spiral portions are located at one end and the other end in the width direction, so that they are compressed. The spiral portion is unlikely to bend with respect to the load.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 2A and 2B show a spring device 1 of the present invention, which is formed by assembling a large number of spring bodies 2 in a matrix. The spring body 2 is formed of a single steel wire. That is, as shown in FIGS. 1A to 1C and FIG. 3, the spring body 2 has a pair of spiral portions 3.

The spiral portion 3 is composed of a rectangular portion 4 formed by winding the steel wire in a rectangular shape, and the corner portion of each rectangular portion is formed into an arm portion 4a. By forming the spiral portion 3 from the rectangular portion 4 in which the steel wire is wound in a rectangular shape, each side of the rectangular portion 4 acts as a torsion bar against a compressive load, and thus is wound in a circular shape. The spiral portion 3 has a smaller amount of compressive deformation with respect to the load than in the case. Moreover, since the corner portions are formed in the arm portion 4a, it is possible to give a soft elasticity as compared with the case of the right angle.

The upper ends of the pair of spiral portions 3 are connected by an upper connecting rod portion 5, and the lower ends are connected by a lower connecting rod portion 6. Each of the connecting rods 5 and 6 is composed of a side rod 7a having a straight rod shape and end rods 7b bent at both ends of the side rod 7a in a substantially L shape. The spiral rod 3 is attached to the end rod 7b. It is continuous.

The side rod 7a of the upper connecting rod portion 5 is located on one end side in the width direction intersecting the separating direction of the pair of spiral portions 3, and the side rod 7a of the lower connecting rod portion 6 is located on the other end side. are doing. That is, the upper connecting rod portion 5 and the lower connecting rod portion 6 are located at one end side and the other end side in the width direction of the spring body 2.
As a result, the spring body 2 receives the compressive load substantially evenly on the one end side and the other end side in the width direction.
Will be compressed and deformed without bending. That is,
The upper surface formed by the upper connecting rod 5 is compressed and deformed with almost no inclination.

Both ends of one steel wire forming the spring body 2 are located in the middle of the lower connecting rod portion 6, but are abutted there, and the joint portion 8 thereof is welded. That is, in the spring body 2, one spiral portion 3 is first formed from the middle portion of the lower connecting rod portion 6 by the steel wire. Next, one spiral part 3 is formed with an upper connecting rod part 5 whose one end is continuous, and the other end of the upper connecting rod part 5 is formed with the other spiral part 3 which is continuous with the other end of the lower connecting rod part 6. Part is formed. Then, the end of the steel wire is butted against the starting end to form the joint portion 8, and the joint portion 8 is welded.

Therefore, since the spring body 2 is formed in a closed shape in which the starting end and the terminating end of a single steel wire are joined, the spring body 2 of the spring body 2 is compared with the case where the starting end and the terminating end are not joined. The rigidity can be improved.

In the spring device 1, in the row direction indicated by arrow A in FIG. 2A, the spring body 2 is an end portion in the longitudinal direction along the separating direction of the pair of spiral portions 3, that is, the connecting rod portion 5, The end rods 7b of 6 are joined to each other, and in the column direction shown by the arrow B, the side rods 7a are placed at predetermined intervals.

In the spring bodies 2 arranged in a matrix, the joined end rods 7b are joined by a helical wire 9 provided along the column direction B, and the spring device 1 has a rectangular shape as a whole. A frame line 11 is arranged at the peripheral portion of the spring device 1, and the frame line 11 is connected to the side rod 7a and the end rod 7b of the spring body 2 located at the peripheral portion of the spring device 1 by a clip 12.

An elastic material such as urethane foam (not shown) is polymerized on the upper and lower surfaces of the spring device 1, and the polymer is covered with a bag-like exterior material (not shown).

According to the spring device 1 having the above structure, the spring body 2 is formed by connecting the upper and lower ends of the two spiral portions 3 with the upper connecting rod portion 5 and the lower connecting rod portion 6, respectively. Therefore, the number of spring bodies 2 forming the spring device 1 can be reduced to about half as compared with the case of forming the coil springs, so that the assembling work can be facilitated.

Further, since the number of the spiral portions 3 is two, there is almost no twist unlike the conventional spring body having many spiral portions. Therefore, the assembly work becomes easy.

Moreover, since the spring body 2 has a closed structure in which both ends of a single steel wire are joined together, the pair of spiral portions 3 of the spring body 2 is unlikely to be twisted, and even if the steel body is made of steel. Even if there is a twist before joining both ends of the wire, the twist is corrected by joining the both ends, so that the assembly work of the spring device 1 can be easily performed.

Furthermore, the upper connecting rod 5 and the lower connecting rod 6
Since and are located on one end side and the other end side in the width direction of the spring body 2, the spiral portion 3 is unlikely to be bent and deformed when a compressive load is applied. That is, when the compressive load is applied, the upper surface of the spring body 2 is unlikely to tilt in the width direction, so that the supporting state is stabilized.

The present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the gist of the invention. For example, in the above-described embodiment, the longitudinal ends of a plurality of spring bodies 2 are joined together along the row direction of the spring device 1, and the width directions of the spring bodies 2 are spaced apart from each other in the column direction by a predetermined distance. Although arranged, the longitudinal ends of the plurality of spring bodies 2 are joined together along the column direction, and the width directions of the spring bodies 2 may be arranged at predetermined intervals in the row direction. In that case, the helical wire 9 is provided along the row direction, which is the longitudinal direction of the spring device 1.

[0028]

As described above, the present invention provides a spring body in which a pair of spiral portions and a pair of connecting rods connecting the upper and lower ends of these spiral portions are continuously formed by a single steel wire. The spring device is used to configure the spring device.

Therefore, the number of spring bodies to be used can be halved as compared with the case where the spring device is constructed by using independent coil springs one by one, and therefore the assembling work of the spring device can be facilitated. Moreover, since the spring body is formed by continuously forming two spiral portions, twisting is less likely to occur as compared with the case where a large number of spiral portions are continuously formed, which also facilitates the assembling work of the spring device.

Further, since the pair of connecting rods having the upper end and the lower end of the pair of spiral portions of the spring body which are continuous with each other are located at one end side and the other end side in the width direction of the spring body, they are spiral against the compression load. The part is difficult to bend and deform. Therefore, since the spring body supports the load in a stable state, the performance of the spring device can be improved.

[Brief description of drawings]

FIG. 1A is a front view in which two spring bodies are joined at their longitudinal ends, showing an embodiment of the present invention. Similarly, (b) is a plan view and (c) is a side view.

2A is a plan view of the spring device, FIG.
Similarly, (b) is a front view.

FIG. 3 is a perspective view showing a state in which two spring bodies are also connected to each other.

[Explanation of symbols]

1 ... Spring device, 2 ... Spring body, 3 ... Spiral part,
5 ... upper connecting rod, 6 ... lower connecting rod, 9 ... helical wire.

Claims (1)

[Claims] 1. A plurality of spring bodies are arranged side by side in a matrix,
In a spring device configured by connecting these spring bodies with a helical wire, the spring body intersects with a pair of spiral portions spaced apart at a predetermined interval with their axes substantially parallel to each other, and a separation direction of the pair of spiral portions. A pair of connecting rods located at one end and the other end in the width direction and connecting the upper end and the lower end of the pair of spiral parts, respectively, are continuously formed by one steel wire, and the plurality of spring bodies are , The longitudinal end portions along the separating direction of the pair of spiral portions are joined in one of the row direction or the column direction, and the side portions in the width direction in the other direction are arranged with a predetermined gap therebetween, and are joined together. A spring device, characterized in that the formed longitudinal ends are connected by the helical wire.