JPH055486B2 - - Google Patents

Description

[Detailed description of the invention]

OBJECT OF THE INVENTION (Field of Industrial Application) The present invention relates to a seat cushion belt that is stretched over the frame of an automobile seat to hold the seat cushion. (Prior Art and Problems to be Solved by the Invention) Some conventional automobile seats have a spring attached to the frame and a seat cushion held on top of the spring. However, since many of the same springs are used, the entire seat becomes heavy. On the other hand, in order to reduce weight, a belt has been developed in which the springs are replaced with warp threads made of alternating rubber threads and polyester threads, and weft threads are woven together with the weft threads. However, in cold regions such as Hokkaido where the average temperature is -20 to -30°C, the rubber threads that make up the warp deteriorate and become difficult to stretch and recover, resulting in the belt having poor elasticity. . Therefore, it has been considered to use a polyurethane elastic thread with excellent cold resistance in place of the rubber thread, but this polyurethane elastic thread has poor resilience when used in its normal form, and large residual elongation occurs once it is stretched. It has the property of not returning to its original length.
It has not yet been put into practical use. Structure of the Invention (Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention includes the following:
The sheet cushion belt is made by weaving a warp consisting of a polyurethane elastic yarn wrapped with a covering yarn in a pre-stretched state and a strength-retaining yarn with a weft yarn in a stretched state. . (Function) When the seat cushion belt is not loaded with any load, it contracts slightly due to the restoring force of the polyurethane elastic thread woven in the stretched state. Therefore, the seat cushion belt stretches when a load is applied. However, since strength-retaining yarns are used in the warp, the amount of elongation is regulated by the strength-retaining yarns. The polyurethane elastic threads that make up part of the warp are
Since the covering yarn is wound in a pre-stretched state, even if it is further stretched, residual elongation is small and recovery properties are good. Therefore, the seat cushion belt immediately returns to its original length when the load is removed. (Example) Hereinafter, examples 1 to 3 that embody the present invention will be described.
This will be explained according to the diagram. Seat cushion belt of this example (hereinafter referred to as
As shown in FIGS. 2 and 3, a belt 1 (referred to as a belt) has a long shape, and both ends thereof are folded back and firmly sewn together using a double stitch or the like, and a mounting hole 2 is provided therein. A mounting bracket 3 having a U-shape and a bent end at a right angle is loosely fitted into the mounting hole 2, and the mounting bracket 3 is engaged with a through hole provided in the frame 4 to attach the belt 1. can be stretched on the same frame 4. As shown in FIG. 1, the belt 1 includes a polyurethane elastic thread 5 having excellent cold resistance and a strength-retaining thread 6.
The weft yarn 7 made of polyester yarn of 1000 to 6000 denier (2000 denier yarn was used in this example) is woven into the warp yarn 9 which is alternately arranged with the warp yarn 9 stretched. ing. The polyurethane elastic thread 5 is preliminarily
40,000 denier polyurethane elastic thread is stretched to 3.0 to 6.0 times its length by applying a load.
A covering yarn 8 made of polyester yarn of 50 to 3000 deniers is wound relatively densely on its surface. In this example, a 500 denier polyester thread was wound around an 18,000 denier polyurethane elastic thread that had been stretched under a load of 1.7 kg. The reason why polyurethane elastic threads are stretched in advance is that polyurethane elastic threads generally have poor recovery properties, and once stretched, a large amount of residual elongation occurs, making the thread longer than its original length by the same amount of residual elongation. On the other hand, polyurethane elastic threads that have been stretched once and have residual elongation have a small residual elongation and good recovery properties when stretched again, and this elongation is comparable to the residual elongation of ordinary rubber. be. The reason why the covering thread 8 is tightly wound around the polyurethane elastic thread 5 is to prevent the polyurethane elastic thread 5 from being damaged and cut by heddles during the weaving process, and to prevent the polyurethane elastic thread 5 from being damaged and cut by the heddles during the weaving process. This is to prevent the elastic thread 5 from shrinking more than a predetermined amount. Note that as the covering thread 8, filament threads such as nylon threads and polypropylene threads can be used in addition to polyester threads. The strength-retaining thread 6 is made of a polyester thread of 1,000 to 6,000 deniers (2,000 denier was used in this embodiment), and has excellent tensile strength. The use of the same strength-retaining thread 6 is to prevent the woven belt 1 from elongating too much when an unnecessarily large load is applied if the warp is composed only of the polyurethane elastic thread 5. This is because the elongation is regulated by the same strength maintaining thread 6. Note that nylon thread can also be used instead of polyester thread. Next, the operation and effects of this embodiment configured as described above will be explained. Since the belt 1 of this embodiment is woven with the polyurethane elastic threads 5 stretched in advance in a further stretched state, a restoring force acts on the belt 1, so that the belt 1 shrinks slightly in a normal state where no load is applied. Therefore, when a large load is applied to the belt 1 by a passenger sitting on the seat or by placing luggage or the like on the seat, the belt 1 stretches. The amount of elongation at this time is regulated by the strength maintaining yarn 6. When the load is removed from the belt 1, the belt 1 immediately returns to its original state due to the restoring force of the polyurethane elastic threads 5. At this time, since the polyurethane elastic thread 5 is stretched in advance to reduce residual elongation, the sheet will not bottom out. In addition, in order to confirm that the above-mentioned residual elongation was reduced, experiments shown in the following table were conducted. The same table is
10cm polyurethane elastic thread (referred to as sample in the table)
After applying a load to the yarn and stretching it to 3 to 6 times the length, the residual elongation when the same load is removed, and the polyurethane elastic yarn that has experienced these residual elongations, are again loaded and stretched to twice the length. The measured value is the residual elongation when the same load is removed after elongation.

【table】

[Table] was pulled.
This table shows that the residual elongation during the second elongation is extremely small compared to the residual elongation during the first elongation. As described above, the belt 1 of this embodiment elongates by a predetermined amount when a large load is applied, and when the same load is removed, the residual elongation is small and returns to the original length. Because the springs perform in the same manner as the original condition, they can not only be used in car seats in the same way as conventional springs, but also only require two tensioned springs on the frame, reducing the number of parts in the car seat. Weight reduction can be achieved. It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and can be embodied and implemented, for example, as follows. (1) The polyurethane elastic threads 5 and the strength-retaining threads 6 constituting the warp threads 9 may be arranged alternately. You can arbitrarily change the combination, such as disposing one. This allows you to change the elasticity of the belt. (2) The amount by which the polyurethane elastic thread 5 is stretched in advance by applying tension can be changed depending on the hardness of the polyurethane elastic thread 5. For example, if it is hard, it is stretched more, and if it is soft, it is stretched more. It is preferable to extend it slightly. Effects of the Invention As detailed above, the seat cushion belt of the present invention does not deteriorate in cold regions and maintains its original state when stretched on a frame, so it can be used for automobile seats. I can,
Furthermore, it is possible to reduce the number of parts and weight of the automobile seat.

[Brief explanation of the drawing]

The drawings show an embodiment embodying the present invention, and FIG. 1 is an enlarged vertical cross-sectional view taken along the line A-A in FIG. 3, and FIG. 2 shows a seat cushion belt attached to the frame. A perspective view, FIG. 3 is a perspective view of the main part of the attachment part of the seat cushion belt. 5...Polyurethane elastic thread, 6...Strength retaining thread, 7...Weft, 8...Covering thread, 9...Warp.

Claims (1)

[Scope of Claims] 1. A warp 9 consisting of a polyurethane elastic yarn 5 and a strength-retaining yarn 6 around which a covering yarn 8 is wound in a pre-stretched state is woven with a weft 7 in a stretched state. Belt for seat cushion. 2 The polyurethane elastic thread 5 and the strength-retaining thread 6
2. A seat cushion belt according to claim 1, wherein the seat cushion belts are arranged alternately.