JPH04136162U - spring structure - Google Patents

Abstract

(57) [Abstract] [Purpose] In a spring structure in which coil springs are accommodated in a plurality of continuously formed bags, a strip body formed by folding two long strips has a zigzag pattern vertically and horizontally. The object of the present invention is to provide a spring structure in which a plurality of bag parts are successively formed by providing welded parts, and the strength of the bag parts is improved. [Structure] In a spring structure in which a coil spring is accommodated in a continuously formed bag part, a long strip plate is folded in two pieces with its longitudinal centerline as a fulcrum. A plurality of bag portions were continuously formed by zigzag-shaped vertical welded portions extending in the longitudinal direction at appropriate intervals along the strip and zigzag-shaped horizontal welded portions extending in the lateral direction of the strip.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a spring structure used in mattresses and the like. Change Specifically, a coil spring is housed in a continuously formed bag portion.

0002

[Conventional technology]

Conventionally, springs consist of coil springs housed in a plurality of continuously formed bags. In the construction, a long cloth strip is split into two pieces with its longitudinal centerline as a fulcrum. Fold it over to form a strip, and place the strips at appropriate intervals along the lateral direction of the strip. The vertically sewn part is sewn by a sewing machine that extends in the vertical direction, and the sewn part is sewn by a machine that extends in the horizontal direction of the strip. The plurality of bag parts are continuously formed by the horizontally sewn parts.

0003 However, sewing using a sewing machine is very time-consuming and causes an increase in costs. It had become. Therefore, we have recently started welding polypropylene resin to the strip using heat or high frequency. Linear welding is now being used instead of machine stitching using materials that I became angry. Welding in this way improves work efficiency and reduces costs. can be done.

0004

[Problem that the idea aims to solve]

However, if the bag is formed by the above-mentioned linear welding, it will melt after long-term use. It is easy to break from the welded part due to tension applied in the direction perpendicular to the direction in which the welded part extends. However, there is a problem that linear welding is weak in strength and the strength of the bag portion is insufficient.

[0005]

[Means to solve the problem]

This idea solves the above problems and proposes a spring structure with improved strength of the bag part. It is about providing. For this reason, this idea is to incorporate coils into multiple bags that are continuously formed. In a spring structure that accommodates a spring, a long strip plate is Fold it into two pieces using the center line as a fulcrum to form a strip, and then fold it along the horizontal direction of this strip. A zigzag-shaped vertical weld extending in the longitudinal direction of the strip with appropriate spacing and a horizontal weld of the strip. The plurality of bag portions were continuously formed by the horizontal weld portions extending in the direction.

[0006]

【Example】

An embodiment of this invention will be described below based on the drawings. 1 in the figure is the spring structure It is. This spring structure 1 is a long piece of non-woven fabric made of polypropylene resin. A strip 3 is formed by folding the strip 2 into two pieces about the longitudinal center line of the strip 2 as a fulcrum. There are strips extending in the longitudinal direction of the strip 3 at appropriate intervals along the lateral direction. A plurality of vertical welded parts 4 and horizontal welded parts 5 extending in the horizontal direction of the strip 3 are formed. Bag portions 6 are continuously formed, and each bag portion 6 has a coil spring 7 attached thereto. The belt-shaped body 3 is housed with its axis parallel to the longitudinal direction of the belt-shaped body 3. Vertical and horizontal above The welded parts 4 and 5 are formed by high frequency welding or the like.

[0007] According to the spring structure having the above configuration, the vertical welding applied to the strip body 3 Since the part 4 is formed in a zigzag shape along its length, it is different from the conventional straight welding. It is formed longer in the length direction than the welded part, and the longitudinal welded part 4 is longer in the length direction. In other words, the cross-sectional area of the strip 3 along the longitudinal direction is larger than that of a conventional linear weld. This means that the sound is clearly formed. Therefore, this vertical welding part 4 is For tension applied in a direction perpendicular to the Since the tension applied per stack is smaller, it is stronger than conventional straight welds. This means that there is no possibility of breakage from this vertical weld 4 even after long-term use. The strength of the bag portion 6 is improved compared to the conventional bag portion.

[0009] Similarly, the horizontal welded portion 5 formed on the strip 3 is a cross section along the length direction of this horizontal welded portion 5. Since the area is larger than the cross-sectional area of the conventional linear weld, the length of this horizontal weld 5 In response to the tension applied in the direction perpendicular to the direction of The bag portion 6 is made stronger than the welded portion, and the bag portion 6 is different from the conventional bag portion. Strength is improved compared to

0010 In the above example, a substantially wave-shaped weld is shown as a zigzag weld, but this The zigzag weld includes not only a crank-shaped weld but also a crank-shaped weld.

[0011]

[Effect of the idea]

As mentioned above, this idea is based on a belt-shaped body made by folding two long strips. Zigzag-shaped vertical welds extending in the longitudinal direction of the strip at appropriate intervals along the lateral direction and zigzag-shaped horizontal welds extending in the lateral direction of the strip to form multiple bag parts in succession. A spring assembly was constructed by accommodating a coil spring within this bag. follow The strength of the weld is improved compared to the conventional spring structure with a straight weld. Therefore, the strength of the bag of this invention is improved compared to the conventional bag, and it can withstand long-term use. There is no possibility that the bag part will break.

[Brief explanation of drawings]

[Figure 1] Front view of spring structure

[Figure 2] Plan view of the spring structure

[Figure 3] Enlarged view of welded area

[Fig. 4] Cross-sectional view taken along line A-A in Fig. 3

[Explanation of symbols]

1 Spring structure 2 Band plate 3 Band-shaped body 4 Vertical weld part 5 Lateral weld part 6 Bag part 7 Coil spring

Claims (1)

[Scope of utility model registration request] Claim 1: In a spring structure in which a coil spring is accommodated in a plurality of continuously formed bags, a long strip is folded into two pieces about its longitudinal centerline as a fulcrum to form a strip. The plurality of bag portions are formed by a zigzag-shaped vertical welding portion extending in the longitudinal direction of the strip-shaped body and a zigzag-shaped horizontal welding portion extending in the lateral direction of the strip-shaped body at appropriate intervals along the lateral direction of the strip-shaped body. A spring structure characterized in that it is formed continuously.