JP2912856B2 - Spring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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 mattress for a bed, a spring device is formed by arranging a large number of coil springs as spring bodies in a matrix and connecting them by helical wires. −
It is formed by polymerizing a sheet-like elastic material such as a rubber and covering this polymer with a bag-like exterior material.

In the above-described spring device, a large number of independent coil springs are juxtaposed in a matrix, and the upper end surface and the lower end surface of these coil springs are connected by a helical wire in a row direction or a column direction, respectively. Since it must be done, the assembling work takes a lot of time, and the productivity is low.

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

[0005] The conventional spring body having the above-described structure is formed to have a length extending over the entire length of the spring device in the row direction or the column direction. For example, when the above-mentioned spring body is formed with a length corresponding to a row direction which is a longitudinal direction of the spring device, 16 to 18 spiral portions are formed in one spring body.

However, if a spring body having a number of spirals is formed by a single steel wire, the axes of the spirals are unlikely to be oriented in the same direction, resulting in a large twist of the spring as a whole. is there. Therefore, when a plurality of torsion spring bodies are connected by a helical wire, the work must be performed while correcting the torsion of the spring bodies.

Further, in the above-mentioned conventional spring body, the connecting rod portion connecting the upper ends of the adjacent spiral portions and the connecting rod portion connecting the lower ends thereof have one end in the width direction crossing the direction in which the spiral portions are juxtaposed. Was formed. 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 more compressive load at one end in the width direction where the connecting rod is provided than at the other end. The axis of the spiral is likely to bend. As a result, since the upper surface of the spring body is inclined, the support state by the upper surface may become unstable.

[0009]

As described above, the conventional spring body is formed to have a length corresponding to the row direction or the column direction of the spring device, so that a single spring body has many spiral portions. Can be If the number of spirals increases, the spring body is likely to be twisted in the width direction. Therefore, when assembling in a matrix, it is necessary to perform the twisting while correcting the twist, so that the assembling work may be troublesome.

Further, since the connecting rods connecting the adjacent spirals are provided at the upper end and the lower end of the spirals in the same direction in the width direction of the spring body, the spirals are bent when receiving a compressive load. It was easy to do.

The present invention has been made based on the above circumstances, and an object of the present invention is to assemble by using a spring body which is less likely to be twisted and whose helical portion is less likely to be bent against a compressive load. An object of the present invention is to provide a spring device which is easy and has a stable supporting state.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a plurality of spring bodies arranged in a matrix.
In a spring device configured by connecting these spring bodies with a helical wire, the spring bodies intersect with a pair of helical portions that are separated from each other at predetermined intervals with their axes substantially parallel to each other, and intersect with a direction in which the pair of helical portions are separated. A pair of connecting rod portions 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 portions are formed continuously by one steel wire, and a plurality of spring bodies are provided. In the row direction or the column direction, the longitudinal ends along the separation direction of the pair of spiral portions are joined in one direction, and the side portions in the width direction are arranged at predetermined intervals in the other direction,
The joined longitudinal ends are connected by the helical wire.

The spring body composed of a pair of helical portions is hardly twisted as a whole, and the connecting rod portions connecting the upper and lower ends of these helical portions are located at one end and the other end in the width direction. The helical portion is unlikely to bend under load.

[0014]

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

The spiral portion 3 comprises a rectangular portion 4 formed by winding the steel wire in a rectangular shape, and the corner of each rectangular portion is formed in an arc portion 4a. Since the spiral portion 3 is formed from a rectangular portion 4 formed by winding a steel wire in a rectangular shape, each side of the rectangular portion 4 acts as a torsion bar against a compressive load. The spiral portion 3 has a smaller amount of compressive deformation with respect to the load than in the case. In addition, since the corners are formed in the arc portion 4a, softer elasticity can be provided as compared with the case of a 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 straight rod-shaped side rod 7a and end rods 7b bent at both ends of the side rod 7a in a substantially L-shape. The spiral part 3 is attached to the end rod 7b. It is continuous.

The side rod 7a of the upper connecting rod 5 is located at one end in the width direction intersecting the direction of separation of the pair of spirals 3, and the side rod 7a of the lower connecting rod 6 is located at the other end. doing. That is, the upper connecting rod 5 and the lower connecting rod 6 are located at one end and the other end in the width direction of the spring body 2.
As a result, the spring body 2 receives the compressive load almost equally at one end and the other end 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 almost without tilting.

Both ends of one steel wire forming the spring body 2 are located in the middle of the lower connecting rod 6, where they abut each other, and the joint 8 is welded. That is, in the spring body 2, one spiral portion 3 is first formed from a middle portion of the lower connecting rod portion 6 by the steel wire. Next, an upper connecting rod portion 5 having one end continuous with one spiral portion 3 is formed, and the other spiral portion 3 continuous with the other end of the upper connecting rod portion 5 is formed. Is formed. Then, the end of the steel wire is butted against the start end to form the above-mentioned joint portion 8, and the joint portion 8 is welded.

Therefore, the spring body 2 is formed in a closed shape in which the starting end and the end of one steel wire are joined, so that the spring body 2 has a larger shape than the case where the starting end and the end are not joined. The rigidity can be improved.

In the spring device 1, in the row direction indicated by the arrow A in FIG. 2A, the spring body 2 has a longitudinal end along the direction in which the pair of helical portions 3 are separated, that is, the connecting rod 5, 6 are arranged so as to be joined together, and in the row direction indicated by the arrow B, the side rods 7a are arranged at predetermined intervals.

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

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

According to the spring device 1 having the above configuration, the spring body 2 is formed by connecting the upper end and the lower end of the two spiral portions 3 with the upper connecting rod 5 and the lower connecting rod 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 where the spring body 2 is formed by a coil spring, so that the assembling work can be facilitated.

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

Moreover, since the spring body 2 has a closed structure by joining both ends of a single steel wire, not only is it difficult for the pair of helical portions 3 of the spring body 2 to be twisted, but also if the steel Even if there is a twist before joining both ends of the wire, the twist is corrected by joining both ends, so that the assembling work of the spring device 1 can be easily performed.

Further, the upper connecting rod 5 and the lower connecting rod 6
Are positioned at one end and the other end in the width direction of the spring body 2, so that the helical portion 3 is less likely to bend and deform when subjected to a compressive load. That is, since the upper surface of the spring body 2 is hardly inclined in the width direction when receiving a compressive load, the support state is stabilized.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the invention. For example, in the above-described embodiment, the longitudinal ends of the plurality of spring bodies 2 are joined and arranged along the row direction of the spring device 1, and the width direction of the spring bodies 2 is separated at predetermined intervals in the column direction. Although they are arranged, the longitudinal ends of the plurality of spring bodies 2 may be joined and arranged along the column direction, and the width direction 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 helical portions and a pair of connecting rod portions connecting the upper and lower ends of the helical portions are continuously formed by one steel wire. The spring device was configured using the spring device.

As a result, the number of spring bodies to be used can be reduced to about half as compared with the case where the spring device is constituted by using independent coil springs one by one, so that the assembling work of the spring device can be facilitated. Moreover, since the spring body has two spiral portions formed continuously, twisting is less likely to occur than in the case where a large number of spiral portions are continuously formed, thereby facilitating the assembly operation of the spring device.

Further, since a pair of connecting rods which connect the upper end and the lower end of the pair of helical portions of the spring body are located at one end and the other end in the width direction of the spring, the helical member is helical against a compressive load. The part is hard 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 the drawings]

FIG. 1A is a front view showing two embodiments of the present invention, in which longitudinal ends of two spring bodies are joined to each other. (B) is a top view, and (c) is a side view.

FIG. 2 (a) is a plan view of the same spring device,
(B) is a front view similarly.

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

[Description of References] 1 ... Spring device, 2 ... Spring body, 3 ... Spiral part,
5: Upper connecting rod, 6: Lower connecting rod, 9: Helical line.

Claims (1)

(57) [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 a pair of helical portions spaced apart at a predetermined interval with their axes substantially parallel to each other, and intersects a separation direction of the pair of helical portions. A pair of connecting rod portions 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 portions are formed continuously by one steel wire. In one of the row direction or the column direction, a pair of spiral portions are joined at their longitudinal ends along the separation direction, and the width direction side portions are arranged at predetermined intervals in the other direction, and are joined. A spring device characterized in that the formed longitudinal ends are connected by the helical wire.