JPS5853217B2 - compression spring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in compression springs constituting spring structures such as pinerests and chairs.

For example, a pinerest for a bed is made by connecting a large number of compression springs into a flat plate to form a spring structure, and then polymerizing an elastic material such as urethane foam on the flat surface of this spring structure, and then attaching this polymer to an exterior shaft. It is constructed by covering.

The pinerest with this type of structure has a softness that supports the user without transmitting the stiffness of the spring structure to the user when the user lies down, and a pine support that supports the user's heavy parts, such as the buttocks, deep inside the spring structure. An important performance requirement is hardness that supports the material without sinking.

Conventionally, the above spring structure usually includes a compression spring,
So-called coil springs, which are made of wire wound into a spiral, were used.

However, in a spring structure made up of a coil spring, the amount of deflection of the cocal spring is almost proportional to the load, so if a soft coil spring is used to give the spring structure flexibility, the load will be large. It is unavoidable that the amount of deflection at the part where is applied becomes large.

That is, a heavy part of the user, such as the buttocks, sinks deeper into the spring structure than other parts.

As a result, the user is supported with his or her back bent, which not only makes it uncomfortable to sleep, but is also bad for one's health.

Therefore, some ideas are being considered, such as using hard coil springs to prevent the user's heavy parts from sinking, or installing reinforcing members to reinforce the coil springs in places that support the heavy parts. In the former case, the required flexibility of the spring structure is impaired, and in the latter case, parts other than the coil spring are required, resulting in higher costs and more complicated assembly work.

This invention was made based on the above-mentioned circumstances, and its purpose is to first deflect in proportion to the load within a predetermined range during the compression process, and then to almost never deflect in response to the load. An object of the present invention is to provide a compression spring that exhibits a high degree of hardness.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6, in which it is applied to a spring structure of a pinerest.

In the figure, 1 is a spring structure. This spring structure 1
is constructed by connecting a large number of compression springs 2 in a flat plate shape, and connecting frame lines 3, 3 to the peripheral portions of the upper and lower surfaces.

The compression spring 2 is formed by bending a wire rod as shown in FIGS. 4 to 6.

That is, the first receiver, which is formed in a rectangular frame shape and faces parallel to each other at both upper and lower ends, has a portion 4 and the second receiver has a portion 5.
The receiver has a first spiral part 6 in which the wire is wound approximately 450 degrees in the part 4.
are continuous.

A linear torsion portion 7 is continuous with the first spiral portion 6 .

A second helical part 8 in which a wire is wound approximately 270 degrees in the opposite direction to the first helical part 6 is continuous to this torsion part 7, and this second helical part 8 is connected to the second receiving part 5. It is continuous.

Both end portions of the first and second receivers of the wire rod located at portions 4 and 5 are bent into U-shaped hooks 9 and 10, and these hooks 9 and 10 are connected to the first and second receivers. is the first part following parts 4 and 5.
, are engaged with the base end portions of the second spiral portions 6 and 80.

In addition, the first and second receiver parts 4 and 5 each have a bent part 11 in which each side forming a rectangular frame is bent in an upside-down direction at both ends and each adjacent end. ...is formed.

As shown in FIG. 1, the compression spring 2 thus formed has the first and second receiver parts 4, 5 assembled together, and these receivers are the bent parts 11 of the parts 4, 5... ... by connecting them in rows so as to be continuous through them, arranging a large number of rows in parallel, and connecting the corner parts of the adjacent receiving parts of each row with clips 12...-. They are connected like a flat plate.

The compression spring 2, which is connected in a flat plate shape and positioned at the peripheral portion, has a P43 made of a band-shaped steel plate passed through the corner portion located at the outermost edge of the upper and lower receiver portions 4 and 5.

Further, between the pair of upper and lower frame lines 3, 3, reinforcing springs 15, which are formed by bending a band-shaped steel plate into an annular shape and have approximately V-shaped spring portions 14, 14 on both sides thereof, are installed at predetermined intervals in the peripheral direction on the upper and lower sides. are connected by clips 16 . . . to constitute the spring structure 1.

In addition, when connecting the compression springs 2 in a row, the upper and lower receivers 4 and 5 should be opened at the hooks 9 and 10, and the upper and lower receivers of the adjacent compression springs 2 should be connected to the sections 4 and 5. The corners of the upper and lower receiver parts 4 and 5 are bent parts 11 in which the ends of the two sides forming these corner parts are bent in the upside down direction.
Therefore, the parts 4 and 5 of the adjacent upper and lower supports are connected without being subjected to stress that would tilt the horizontal state.

Furthermore, the upper and lower supports are provided with a frame line 13 passing through the corner portions of parts 4 and 5.
However, the parts 4 and 5 of the upper and lower supports are not subjected to any stress.

In the spring structure 1 configured in this way, the upper tube of the compression spring 2 is coated with an elastic body such as urethane foam on the surface of the section 4 side and the surface of the lower tube section 5 side through protective materials (not shown). polymerize and apply this polymer to the exterior material (not shown).
It is formed into a pine tress by covering it with.

In the pinerest with the above configuration, the upper tube of the compression spring 2 is used with the surface connected to the section 4 facing upward, but when the user lies down on the side of the section 4, the upper tube is first compressed. The first spiral portion 6 of the spring 2 is softly and elastically deformed.

At this time, the second spiral portion 8 is also elastically deformed;
Since the spiral portion 8 has a smaller amount of winding than the first spiral portion 6, the amount of elastic deformation is also smaller.

Next, the load applied to the compression spring 2 is applied to the torsion part I after deforming the first spiral part 6 by a predetermined amount.
Since this torsion portion 7 is harder than the first spiral portion 6, it is only slightly twisted under the above load.

Moreover, the first spiral portion 6 is continuous with the torsion portion 7.
Since the winding direction of the second helical portion 8 is opposite, the torsion stress applied to the torsion portion 7 is in the opposite direction, and this also increases the hardness of the torsion portion 7, so that the compression spring 2 is The helical portion 60 is not compressed to a greater extent than the amount of elastic deformation.

Therefore, the user lying down on the pinerest is supported with a soft feel by the first helical part 6 of the compression spring 2, and also supported by the hardness of the torsion part 7 without the heavy part sinking deeply into the spring structure 1. It turns out.

In addition, the frame line 3 made of band-shaped steel plates provided on the periphery of the upper and lower surfaces of the spring structure 1 makes the periphery of the spring structure 1 hard, increasing the effective usable area.
, 3, the peripheral portion of the spring structure 1 is sufficiently reinforced.

Note that the present invention is not limited to the above-mentioned embodiment; for example, the reinforcing spring 15 provided between the upper and lower frame lines has its spring portion 14
Even if it has a semicircular shape as shown in Fig. 7, an inward V-shape as shown in Fig. 8, or an outward V-shape as shown in Fig. 9, good.

Further, the amount of winding of the first and second helical portions of the compression spring is not limited to the above-mentioned embodiment, and the point is that the amount of winding of the first helical portion is greater than that of the second helical portion.

As described above, in the present invention, the receiver has sections at both ends, and the pair of receivers is located between the sections, and one receiver is connected to the first section that is continuous to the section.
A compression spring is formed by continuously forming a spiral part in the torsion part and a second spiral part which is continuous with the other receiver part, has a winding direction opposite to the first spiral part, and has a large winding amount. .

Therefore, the first helical part bends in proportion to the load, but the torsion part that receives the load next to the first helical part is harder than the first helical part, and the first torsion part continuous to the torsion part The hardness is also increased by the fact that the winding directions of the helical part and the second helical part are opposite, so that the torsion part hardly bends under load.

In other words, the compression spring with the above structure deflects in proportion to the load up to a predetermined range, but beyond that it hardly deflects with respect to the load, so it can be used, for example, in the spring structure of a pine tress. By doing so, it is possible to provide a spring structure that has good flexibility and hardness that supports the user's heavy parts at a depth (without sinking).

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention, FIG. 1 is a plan view showing a part of the spring structure, FIG. 2 is a side view, and FIG. 3 is shown along the line ■-■ in FIG. 4 is a perspective view of the compression spring, FIG. 5 is a plan view, FIG. 6 is a side view, and FIGS. 7 to 9 are reinforcements showing other embodiments of the invention. It is a side view of a spring. 4...First receiving part, 5...Second receiving part, 6...First spiral part, 7...Torsion part , 8... Second spiral part

Claims (1)

[Claims] 1. A receiver made of a wire bent into an annular shape at both ends has a part, and a pair of these receivers has a first spiral part between the parts, one of the receivers has a first spiral part that is continuous with the part, and the other receiver has a first spiral part that is continuous with the part. A compression spring characterized in that a torsion portion is continuously formed with a second spiral portion having a winding direction opposite to the first spiral portion and having a smaller winding amount.