JPH1113947A - Bending member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending member for bending a hose to be circular when pressure is applied in the hose by providing a soft resin hose incorporating a braided layer composed of a number of vertical threads and a number of left and right spiral threads and using ones having different elongation rates as the vertical threads of the upper and lower parts of a hose cross-section at the time of applying pressure to the hose. SOLUTION: A hose 5 is provided by dividing a number of vertical threads 1 and 2 into threads 1 having a large elongation rate and threads 2 having a small elongation rates when gas is fed to apply pressure, braiding these threads with left and right engaging threads 3 and incorporating these in the inner and outer surfaces of a soft resin layer 4. For forming such a hose 5, a soft resin is extruded by an extruder, the vertical threads 1 and 2 and the left and right threads 3 braided by a braiding machine are simultaneously braided, the inner and outer surfaces of this braided reinforced thread layer are covered with the soft resin layer 4 and then the hose 5 is provided. Then, when a fluid is fed from a fluid feeding valve 7 attached to the hose 5 into a bending member 8 for sealing both ends 6 of the hose 5 and pressure is applied into the hose 5, the thread having a large elongation rate is elongated and bent.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible resin hose having a braided layer of a large number of warps and left and right spiral yarns, which bends when the hose is pressurized. It is necessary to bend a port material and the like, and can be installed easily and can be used for storage purposes.

[0002]

2. Description of the Related Art Conventionally, for a simple tent support using a bending member, a sheet or a hose reinforced with a fabric is divided into a large number of parts by cutting in accordance with a bending curvature, and the cut pieces are joined and bent. It is formed into a straight tube by joining two rectangular pieces of woven fabric in one direction as described in JP-A-7-71140, and the woven piece on one side is parallel to the longitudinal direction. A bending member composed of a warp and a weft orthogonal to the warp, and a woven piece on the other side composed of a warp inclined 30 to 60 degrees in the longitudinal direction and a weft orthogonal to the warp is known, and any bending member is known. Also, a valve for air supply is attached, and both ends are sealed, so that it is expanded by air pressurization at the time of use so that necessary bending is performed. However, to manufacture any of the above-mentioned bent members, it is necessary to first manufacture a sheet or hose for reinforcing the woven fabric of the raw material, then cut the sheet or hose, and further join three steps. Takes time. Also, due to variations in joining, when air is used during use, a desired bending curvature may not be easily obtained, or air leakage may occur from the joining portion.

[0003]

The conventional woven fabric reinforced hose or sheet has to be manufactured in three steps of manufacturing, cutting, joining of cut pieces, and manufacturing of bent members, so that productivity is low and cut pieces are further reduced. The quality stability is poor due to the variation of the joints, so that it is necessary to produce a cutting piece corresponding to the bending curvature. Therefore, there is a significant disadvantage in cost. There is also a drawback that it is difficult to manufacture long products. The present invention solves the above-mentioned disadvantages, and forms a hose having a braided layer therein in a single step, can be easily processed, and can be easily adjusted to a desired bending curvature by pressurizing the hose, and Since the hose body is integrally molded, there is no joint,
Therefore, there is no air leakage at all, and long products can be easily made.
It is an object of the present invention to provide a bending member that can be manufactured at low cost.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a soft resin hose having a braided layer of a large number of warp yarns and a large number of left and right spiral yarns, wherein the warp yarns are substantially parallel to the longitudinal direction of the hose. And it is achieved by providing a bending member in which the hose bends in a circular shape when pressurized in the hose.

[0005] The above-mentioned object is achieved by providing a bent member in which a fluid inlet valve is attached to the hose and both ends of the hose are sealed.

[0006]

DETAILED DESCRIPTION OF THE INVENTION In the present invention, a warp is present substantially parallel to the longitudinal direction of a hose, and a bending member in which the hose bends in a circular shape when pressurized in the hose is, typically, an upper part of a hose cross section. And a lower warp having different elongation rates when the hose is pressurized. Bending members that exhibit different elongation rates when the hose is pressed as the upper and lower warps of the hose cross section are preferably obtained by the following method.

First, as a first method, a hose is formed by applying a low tension to a warp at an upper portion of a hose cross section and applying a high tension to a warp at a lower portion of the hose cross section. . This method will be described in more detail.
%, The lower part is divided into 30-70%. When the hose is formed, a low tension is added to the upper warp and a high tension is added to the lower warp, and a fluid is fed into the hose and pressurized.
The warp with a low tension has a higher elongation rate than the warp with a high tension, so that the warp easily stretches. Therefore, the warp with a low tension extends on the outer surface of the hose, and the hose is bent.

A second method is to use a warp having a low elongation as the upper warp in the cross section of the hose, use a warp having a high elongation as the lower warp, and add substantially the same tension to the hose. Molding method. This method will be described in more detail. Among many warps, a low elongation yarn and a high elongation yarn are divided into 30 to 70% at the upper part and 70 to 30% at the lower part of the cross section of the hose. About the same tension addition to the warp of
When the hose is formed, the yarn with a high elongation elongates at the time of molding,
Shrinkage increases after molding. In addition, the yarn with a small elongation rate
The elongation during molding is small, and the shrinkage after molding is smaller than that of a yarn having a high elongation. Since a yarn having a high elongation has a large shrinkage, a yarn having a low elongation is more slack than a yarn having a high elongation. Therefore, when a gas is fed into the formed hose and pressurized, the hose extends by the slack of the yarn having a small elongation and extends on the outer surface of the hose, and the hose bends. Here, the elongation percentage of the yarn indicates the elongation percentage when the yarn itself is elongated by stress.
A large elongation rate means a case where the yarn itself has a large elongation, and a small elongation rate means a case opposite to the above. The difference between the large elongation and the small elongation
It depends on yarn type, yarn fineness, hose size, fluid pressure in hose, and hose bending.

As a third method, a method combining the conditions of the first and second methods, for example, using a warp having a high elongation as an upper warp in a cross section of a hose and using a warp having a high elongation as a lower warp. A method of forming a hose by using a small warp and applying a low tension to a warp having a high elongation at the top and a high tension to a warp having a low elongation at the bottom. According to this method, the warp having a high elongation elongates on the outer surface when the hose is pressurized, and the hose bends.

In the present invention, it is important for the warp to be substantially parallel to the longitudinal direction of the hose, and by doing so, the bending member aimed at by the present invention can be more suitably obtained. It also has the effect of maintaining the pressure resistance in the longitudinal direction of the hose when pressurized. Here, “substantially parallel” means that it exists parallel to the longitudinal direction of the hose or within a range of ± 3 degrees with respect to the longitudinal direction of the hose.

As the warp layer, synthetic fibers such as nylon, polyester and vinylon are used. Nylon is preferred as the yarn having a high elongation, polyester is used as the yarn having a low elongation, and yarn having a high elongation is used as the yarn. A combination of fine denier (fineness) and thick denier as a yarn having a small elongation is also suitable. The tension of the warp and / or the type and denier of the warp can be appropriately combined according to the bending curvature of the hose, the working pressure, the hose size and the like.
As the left and right helical yarns, the same fibers as those described above or other fibers can be used, but it is particularly preferable that the left and right helical yarns are the same type of yarn and have the same denier. . By being the same, it is possible to prevent the hose from twisting when a fluid is fed into the hose and pressurized. The left and right helical yarns vary depending on the hose size, the warp, and the combination of the left and right helical yarns, but are preferably provided in a range of ± 89 degrees, preferably ± 81 degrees with respect to the warp.

By providing the braided layer of the warp and the left and right spiral yarns in the soft resin hose, the bending member aimed at by the present invention can be obtained. Here, as the hose having the braid layer therein, a hose in which the inner and outer surfaces of the braid layer are coated with a soft resin such as a soft vinyl chloride resin, polyurethane, a soft ethylene-vinyl acetate copolymer, TPE (styrene-based elastomer, etc.), or the like is used. It is mentioned as a typical one.

By attaching a fluid feed valve to the obtained hose and sealing both ends of the hose as described above, the fluid is pressurized (0.1 to 2.0 kgf / cm ² ,
Preferably, a bent member that bends in a circular shape at 0.2 to 0.5 kgf / cm ² ) can be obtained. It is preferable that both ends of the hose are hermetically sealed by high-frequency fusion or the like. still,
The sealing of both ends of the hose is preferably performed by inserting a resin cylindrical cap into both ends of the hose and bonding or fusing the inner surface of the hose to the outer surface of the cap. further,
If a gas is used as the fluid to be fed into the hose and it is necessary to maintain the internal pressure of the gas for a long period of time, a resin with good gas barrier properties, such as an ethylene-vinyl alcohol A polymer-based resin, a vinylidene chloride-based resin, or the like can be present by fusion or lamination. A gas is preferable as the fluid, and air is preferable as the gas.

Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a molded hose obtained by the above-described first, second, and third methods before processing a bent member showing an example of the present invention. At the time of feeding and pressurizing, the yarn 1 with a high elongation rate (upper part of the hose cross section) and the yarn 2 with a low elongation rate (the lower part of the hose cross section) are braided with the left and right spiral yarns 3 and the inner and outer surfaces are embedded. Soft resin layer 4
Is a hose 5 having As an example of a method of forming a hose, a soft resin is extruded by an extruder, and at the same time, warp yarns 1 and 2 and left and right spiral yarns 3 knitted by a braiding machine (blader or spiral winder) are braided, and this knitting is performed. The inner and outer surfaces of the braided reinforcing yarn layer are covered with the soft resin layer 4, and the hose 5 is formed in one step.

FIG. 2 is a view showing a bending member 8 in which a fluid inlet valve 7 is attached to the hose 5 and both ends 6 of the hose 5 are flat-sealed and sealed. FIG. 3 shows the hose 5
A resin cap 9 having an outer diameter substantially the same as the inner diameter of the hose is inserted into both ends 6 of the hose, and the inner surface of the hose and the outer surface of the cap are bonded or fused to each other.
FIG. FIG. 4 is a view showing the bending member 8 in a state where the fluid is supplied from the fluid supply valve 7 of the bending member 8 and expanded, and the yarn 1 having a high warp elongation is expanded and bent. In the present invention, a typical example of a bending member that is bent in a circular shape is a member shown in FIG. 4, but also a true circular or elliptical member as shown in FIGS. In the case of an elliptical shape as shown in FIG. 7, a guide for maintaining the shape is appropriately provided. FIG. 5 is a diagram illustrating an example in which the bending member 8 is used as a support of a laminate sheet of the simple tent 10.

As described above, the bending member can be used as a column or the like simply by feeding in the fluid, and after use, the fluid can be easily removed and stored by flattening and winding or folding. Other uses include fenders for small boats. Conventionally, tires, foamed rubber sponges, and the like have been used as fenders for small boats. However, although they function, they are not satisfactory in terms of aesthetic appearance (black). Since the bending member of the present invention is made of a soft resin,
The color of the resin can be freely changed and the aesthetic appearance becomes very good,
In addition, fenders can be easily attached along the curvature of the boat, and replacement is easy. In addition, applications that require flexibility and require easy installation and removal,
For example, it can be used as a simple partition ring at the entrance and exit of a horizontal shaft such as a tunnel, or at the entrance, and can also be used for applications requiring bending and cushioning.

[0017]

The present invention will be further described with reference to the following examples. Examples 1 to 4 A hose was formed as the low tension yarn 1 and the high tension 2 of the warp by the first molding method described above. That is, 40 warps (parallel to the longitudinal direction of the hose) are used under the conditions shown in Table 1 (tension height difference, yarn type), a hose {size 25φ (outer diameter)} is formed, processed, and the bent member is formed. Made. Table 1 shows the degree of bending of the bending member 8 that has supplied air to the obtained bending member.

The left and right helical yarns 3 are made of E (polyester) 1000 De × 24, and the inner and outer surfaces of the left and right braided layers having a knitting angle of 76 ° are covered with a soft vinyl chloride resin 4 at a thickness of 2 mm. Then, the hose 5 was formed in one step (simultaneously forming the braid of the left and right spiral yarns and the resin coating on the warp).
Attach the air inlet valve 7 to the hose 5, press the both ends 6 of the hose 5 and seal them with a high frequency welder.
The bending member 8 (FIG. 2) was obtained.

[0019]

[Table 1]

Example 5 In the above-mentioned second molding method, the warp yarn was divided into a yarn 1 having a large elongation and a yarn 2 having a small elongation while keeping the tension of the warp almost constant. ｝ Was molded. That is, a hose was molded and processed under the conditions shown in Table 2 to produce a bent member 8. Table 2 shows the degree of bending of the bending member by feeding air into the obtained bending member 8.

[0021]

[Table 2]

The left and right spiral yarns 3 are made of polyester 1,000 De × 32 yarns, and the left and right spiral yarns have a knitting angle of 81 °.
3 mm in thickness and molded in one step (simultaneously forming the braid of the left and right spiral threads and the resin coating on the warp) to form the hose 5
(FIG. 1) was obtained. Next, an air supply valve is provided in the hose 5.
Attached in the same manner as in Examples 1-4. To seal the both ends 6 of the bending member 8, as shown in FIG. It was manufactured by bonding. When air is supplied from the air supply valve 7 of the bending member 8 and pressurized, as shown in FIG.
Bends. After use, the internal pressure air of the bending member 8 is evacuated and folded or wound and stored.

[0023]

The bending member of the present invention can be easily manufactured by one-step molding, and the hose can be bent into a circular shape by applying pressure to the inside of the hose. Furthermore, since the main body hose is in a lay flat state before being pressurized by the fluid, it is very easy to install, and the fluid can be fed and pressurized to set a predetermined bend. After use, fluid can be easily removed and folded or wound up, making storage very easy. In addition, since the main body hose is manufactured by extrusion one-step molding, a long product can be easily formed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main body hose in which a warp of a bending member and left and right spiral yarn reinforcing layers are provided.

FIG. 2 is a plan view of a straight bent member in which a fluid inlet valve is attached to a main body hose and both ends of the hose are fusion-sealed.

FIG. 3 is a plan view of a bending member in a straight state in which both ends are made substantially cylindrical by inserting and sealing resin caps at both ends of a hose.

FIG. 4 is a plan view of the bending member in a state where fluid is supplied to the bending member from a fluid supply valve, and is inflated and bent at a difference in the elongation rate of the warp in the hose.

FIG. 5 is a perspective view showing an example in which a bending member is used as a column of a simple tent.

FIG. 6 is a plan view of a bending member bent in a circular shape.

FIG. 7 is a plan view of an elliptical bending member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Warp with large elongation rate 2 Warp with small elongation rate 3 Left and right helical threads 4 Soft resin layer 5 Hose 6 Both ends of hose 7 Fluid feeding valve 8 Bending member 9 Resin cap 10 Simple tent

Claims (6)

[Claims] 1. A soft resin hose having a braided layer of a number of warp yarns and a number of left and right spiral yarns, wherein the warp yarns are substantially parallel to the longitudinal direction of the hose, and the hose is pressurized in the hose. Is bent in a circular shape. 2. The bending member according to claim 1, wherein a fluid inlet valve is attached to the hose, and both ends are sealed. 3. The warp on the upper side and the warp on the lower side of the hose cross section show different elongation rates when pressurized in the hose.
Or the bending member according to 2. 4. The bend according to claim 1, wherein a low tension is added to a warp at an upper portion of the hose cross section and a high tension is added to a lower warp at a lower portion of the hose cross section. Element. 5. A warp having a low elongation is used as an upper warp in a cross section of a hose, a warp having a high elongation is used as a lower warp, and substantially the same tension is added.
The bent member according to any one of claims 1 to 4, wherein a formed hose is used. 6. A bending member which is fed into a hose according to any one of claims 1 to 5, pressurized, pressurized, and bent into a circular shape.