JP2004019700A - Synthetic resin pipe having flexibility and inner face abrasion resistance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synthetic resin pipe having superior flexibility and workability, and further superior abrasion resistance over the whole length of its inner face to be properly used as a feed pipe of hard matters such as coins. <P>SOLUTION: A hard synthetic resin string material 2B is spirally and integrally fused on an inner peripheral face of a soft synthetic resin pipe 1, a plurality of spiral strip members 2a successively overlapped in a state of being displaced from each other in the pipe axial direction are formed by spirally fixing only an outer face of one longitudinal end part of the hard synthetic resin strip member 2A to the hard synthetic resin string member 2B, an inner peripheral wall 2 bendable integrally with the soft synthetic resin pipe 1 is formed by the spiral strip member 2a, and a synthetic resin pipe A having the pressure withstanding strength and the abrasion resistance is configurated by the inner peripheral wall 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a synthetic resin pipe which is most suitable for use as a hard material feeding pipe which requires flexibility and inner surface wear resistance.
[0002]
[Prior art]
Conventionally, there is a flexible synthetic resin tube as a flexible synthetic resin tube, and as a synthetic resin tube having pressure resistance and abrasion resistance, a hard synthetic resin tube is known. In the case of pipe making, it is inferior in abrasion resistance and pressure resistance. For example, when it is used as a feed pipe for hard materials such as coins, the inner peripheral surface is worn out in a short period of time and cannot be used. There is a problem. On the other hand, in the case of a pipe made of a hard synthetic resin, even if it is used as a feed pipe for a hard material, there is almost no risk of damaging the inner surface, but since it is excellent in rigidity and it is difficult to bend, it has a curved shape. It is not suitable for feeding hard materials such as coins and pachinko balls because pipes cannot be constructed.
[0003]
For this reason, an articulated tube body formed by connecting a large number of annular members made of a short tube made of metal or hard synthetic resin, and sequentially connecting the opposite open ends thereof so as to be freely bent, is expanded and contracted and bent at an appropriate angle. And abrasion resistance, it can be used as a feed pipe for hard objects such as coins as described above.
[0004]
[Problems to be solved by the invention]
However, according to such an articulated tubular body, in order to connect adjacent annular members so as to be able to bend freely, one end surface of the annular member has an enlarged locking head at one end surface. A protruding annular portion is formed, and an opening end for receiving the protruding annular portion is formed on the other end surface thereof so as to form an annular groove portion narrower than the enlarged locking head portion. Is widely adopted, so that not only is the structure complicated and the product is expensive, but also each connection has a gap communicating with the inside and outside of the pipe. Therefore, there is a problem that noise generated inside when a hard object such as a coin is fed leaks to the outside, and especially when the annular member is made of metal, a large noise is generated and the environment is deteriorated. is there.
[0005]
Furthermore, dust and the like may enter and adhere to the gap between the annular groove and the protruding annular portion, impairing the flexibility, and may also be damaged by foreign matter biting into the gap. There is a possibility that the projecting annular portion connecting the adjacent annular members may be disengaged from the annular groove portion by the force and may become unusable. In addition, since there is a gap communicating between the inside and outside at the connecting portion between the annular members as described above, even if an attempt is made to transport aggregates such as stone pieces or earth and sand by air or water, There is a problem that the fluid cannot flow out due to the fluid flowing out of the gap to the outside. Furthermore, in the refraction structure between the annular members formed by the annular groove portion and the protruding annular portion as described above, there is a problem that the maximum refraction angle is extremely small and there is a significant restriction in performing piping.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object the simple structure, which is suitable for mass production and can be provided at a low cost, as well as excellent pressure resistance and inner surface wear resistance. It has good abrasion as well as good bendability. In addition, even when a hard object such as a coin is fed, there is no danger of noise leaking to the outside and smooth feeding can be performed. An object of the present invention is to provide a synthetic resin tube that can be transported and can be used for a long time.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the synthetic resin pipe having flexibility and inner surface abrasion resistance according to the present invention is, as described in claim 1, provided on the inner peripheral surface of a soft synthetic resin pipe with a hard synthetic resin. The strip-shaped material is spirally fixed only at the outer surface at one end on the long side thereof at a constant pitch, and the adjacent spiral-shaped strips having a tongue-shaped cross section are sequentially displaced in the tube axis direction by a width equal to the pitch. It has a structure in which the inner peripheral wall is formed so as to overlap in a state of being folded.
[0008]
In the synthetic resin tube having flexibility and inner surface abrasion resistance configured as described above, the invention according to claim 2 is characterized in that a string member made of hard synthetic resin is fixed on an inner peripheral surface of the soft synthetic resin tube. Of the rigid synthetic resin belt-shaped material, which is spirally fused and fixed at a pitch of, and is formed on the rigid synthetic resin cord-like material so as to be wider than the pitch between the rigid synthetic resin cord-like materials. A state in which the outer surfaces of one ends on the long sides are spirally fused and integrated at the same pitch as described above, and adjacent spiral band-shaped members having a tongue-shaped cross section are sequentially shifted in the tube axis direction by a width equal to the pitch. And the inner peripheral walls overlapping each other are formed.
[0009]
Further, the invention according to claim 3 is that, like the inner peripheral wall formed on the inner peripheral surface of the soft synthetic resin pipe, a hard synthetic resin strip is formed on the outer peripheral surface of the soft synthetic resin pipe. Only the inner surface of one end on the side is spirally fixed at a constant pitch, and adjacent spiral band-shaped material portions having a tongue-shaped cross-section are overlapped in a state of being sequentially shifted in the tube axis direction by a width equal to the pitch. It is characterized in that an outer peripheral wall is formed.
[0010]
The synthetic resin tube according to claim 3, wherein the inner and outer peripheral surfaces of the soft synthetic resin tube are formed with hard and flexible inner and outer peripheral walls as described above. A hard synthetic resin cord is spirally fused and fixed at a constant pitch to the outer peripheral surface of the pipe, and the pitch between the hard synthetic resin cords is fixed to the hard synthetic resin cord. The inner surface of one end portion of the longer side of the hard synthetic resin strip formed wider than the above is spirally fused at the same pitch as above and integrated to form the outer peripheral wall.
[0011]
[Action]
The inner wall of the flexible synthetic resin tube is formed by spirally winding a rigid synthetic resin strip in the tube axis direction while overlapping it by a certain width on the inner peripheral surface of the soft synthetic resin tube. The inner peripheral wall has a uniform pressure resistance over the entire length, and the flexible synthetic resin pipe covering the inner peripheral wall is always kept in a circular cross section. In addition, the spiral band-shaped material portions having a tongue-shaped cross section forming the inner peripheral wall made of the hard synthetic resin are sequentially overlapped in a state of being shifted in the tube axis direction, and only one end thereof is formed of the soft synthetic resin. Since the pressure-resistant synthetic resin pipe is bent, the rigid synthetic resin strips slide against each other while expanding and contracting the soft synthetic resin pipe in the pipe axis direction because it is fixed to the inner peripheral surface of the pipe. It can be smoothly and largely bent together, and even when bent to a large angle, the adjacent hard synthetic resin band-shaped material portions maintain a state of overlapping each other.
[0012]
Therefore, even when the tube is bent, the inner surface of the tube exhibits abrasion resistance and pressure resistance due to the inner peripheral wall made of hard synthetic resin over the entire length, and this synthetic resin tube is used as a supply tube for hard objects such as coins. In this case, the inner surface is hardly damaged, and the hard material can be smoothly fed from one end side of the spiral band-shaped material portion having a tongue-shaped cross section to the other end side without causing a caught or the like. In addition, the soft synthetic resin pipe entirely covering the inner peripheral wall can reliably prevent noise from leaking to the outside and use the synthetic resin pipe to make aggregate such as stone. And the earth and sand can be easily transported by fluid, and even during the transport, as described above, the hard synthetic resin strips forming the inner peripheral wall always keep a state of overlapping each other, Soft synthetic resin with soil and sand passing between the strips Prevents reaching the inner surface of the tube, to eliminate the possibility that the soft synthetic resin-made tube is damaged can be subjected to long-term use.
[0013]
In addition, the above-mentioned hard synthetic resin band-shaped material forming the inner peripheral wall of the synthetic resin pipe may be fixed to the inner peripheral surface of the soft synthetic resin pipe directly at one end outer surface in a helical manner by fusion. However, as described in claim 2, a hard synthetic resin cord is spirally fused and fixed at a fixed pitch to the inner peripheral surface of the soft synthetic resin pipe, and the hard synthetic resin cord is fixed. The outer surface of one end portion of the hard synthetic resin strip is overlapped on the material and spirally fused and integrated, so that adjacent spiral strips having a tongue-shaped cross section have a width equal to the pitch. The inner peripheral walls may be formed so as to overlap with each other while being sequentially shifted in the axial direction. According to this synthetic resin pipe, crush deformation of the synthetic resin pipe is unlikely to occur due to the hard synthetic resin cord-like material fixed in a spiral manner to the inner peripheral surface of the soft synthetic resin pipe, and the pressure resistance is further improved. With the increase, the production of this synthetic resin tube can be performed accurately and efficiently.
[0014]
Further, a flexible outer peripheral wall made of a hard synthetic resin strip having the same structure as the inner peripheral wall may be formed on the outer peripheral surface side of the soft synthetic resin pipe. According to the present invention, it is possible to completely cover and protect the soft synthetic resin pipe to prevent damage or breakage, and to exhibit a large pressure resistance together with the inner peripheral wall made of the hard synthetic resin band-shaped material for a long time. Can be used for use.
[0015]
Note that, similarly to the inner peripheral wall, the rigid synthetic resin band-shaped material forming the outer peripheral wall is formed by helically melting the hard synthetic resin cord-like material at a constant pitch on the outer peripheral surface of the soft synthetic resin pipe. Attaching and fixing, the inner surface of one end portion of the hard synthetic resin strip is overlapped on the hard synthetic resin cord and spirally fused and integrated to form an adjacent spiral with a tongue-shaped cross section. An outer peripheral wall may be formed in which the strip-shaped material portions are overlapped in a state of being sequentially shifted in the tube axis direction by a width equal to the pitch.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified side view of a part of a synthetic resin pipe A having flexibility and inner surface wear resistance. The synthetic resin tube A has a structure in which a flexible synthetic resin inner peripheral wall 2 made of hard vinyl chloride and capable of bending deformation is provided on the inner peripheral surface of a soft synthetic resin tube 1 made of soft vinyl chloride. The soft synthetic resin tube 1 and the hard synthetic resin inner peripheral wall 2 are made of soft and hard vinyl chloride resins, respectively, but are made of the same material having good adhesiveness and different in hardness. It may be formed of a material such as a soft polyethylene resin and a hard polyethylene resin.
[0017]
The hard synthetic resin inner peripheral wall 2 is helically wound around the inner peripheral surface of the soft synthetic resin tube 1 at a constant pitch over the entire length, and the outer surface thereof is formed on the inner peripheral surface of the soft synthetic resin tube 1. A rigid synthetic resin cord 2B having a rectangular cross section or an elliptical cross section, and an outer surface of one end on one long side is fused to the inner surface of the rigid synthetic resin cord 2B. And a hard synthetic resin strip 2A which is integrally fixed by being attached and spirally wound along the inner peripheral surface of the soft synthetic resin pipe 1 at the same pitch as the hard synthetic resin cord 2B. I have.
[0018]
Further, the width of the hard synthetic resin strip 2A in the tube axis direction, that is, the width W between both long side edges is formed to be larger than the spiral pitch P of the hard synthetic resin cord 2B. Accordingly, a spiral strip having a tongue-shaped cross section is obtained by winding the hard synthetic resin strip 2A one turn in a helical direction in a state where one end outer surface thereof is fused to the hard synthetic resin cord 2B. The portion 2a and the spiral strip 2a having a tongue-shaped cross section formed by continuously winding the spiral strip 2a in the same manner as described above have a scale-like cross section in a state where they are shifted from each other by the spiral pitch P in the tube axis direction. It has a superimposed structure.
[0019]
In FIG. 1, the width W of the hard synthetic resin strip 2A is formed to be approximately twice the helical pitch P, and therefore, one of the adjacent hard synthetic resin spiral strips 2a, 2a overlapping each other. Of the other spiral band-shaped material portion 2a overlaps with the other half-width portion of the other spiral band-shaped material portion 2a (distal end portion side). It is in a state. Further, the overlapped portions are not fused, and are in a state in which their opposing surfaces are slidably contacted with each other.
[0020]
When the width of the hard synthetic resin strip 2A with respect to the helical pitch P is made too large, when the helical pitch P is constant, adjacent spirals on the inner peripheral wall 2 formed by the hard synthetic resin cord 2B are formed. Since the width of overlap between the strips 2a and 2a increases and the flexibility (flexibility) decreases, the width of the hard synthetic resin strip 2A is set to a width of 1.5 to 3.0 of the spiral pitch P. It is desirable to keep it.
[0021]
Since the outer peripheral wall of the thus-formed synthetic resin tube A is formed by the soft synthetic resin tube 1, the outer surface of the synthetic resin tube A naturally has the same appearance as that of the synthetic resin tube having a smooth surface. The hard synthetic resin inner peripheral wall 2 disposed in a state of being superimposed on the inner peripheral surface of the tube 1 exhibits uniform pressure resistance over the entire length, and always maintains the soft synthetic resin tube 1 in a circular cross section. You can keep.
[0022]
Further, the hard synthetic resin strip 2A forming the hard synthetic resin inner peripheral wall 2 has a state in which the adjacent spiral strips 2a, 2a are sequentially displaced in the tube axis direction by the width of the spiral pitch P. As shown in FIG. 2, when this synthetic resin pipe A is bent (curved) in an arc shape, a tensile force is generated in the outer peripheral wall portion A1 bent in a convex arc shape in the pipe axis direction, as shown in FIG. As a result, the soft synthetic resin tube portion between the adjacent string-like material portions 2b, 2b of the hard synthetic resin-like string material 2B is tensioned, and the rigid synthetic resin spiral belt-like material having a tongue-shaped cross section is sequentially polymerized. The portions 2a, 2a are more firmly pressed against each other to expand in the outer diameter direction with the one end portion integrally fused to the soft synthetic resin cord 2B as a fulcrum, while being bent in a concave arc shape. In the inner peripheral wall portion A2, a compressive force is generated in the pipe axis direction. The outside of the soft synthetic resin pipe portion between the adjacent string material portions 2b, 2b of the hard synthetic resin cord material 2B is compressed and deformed in the tube axis direction, so that the space between the string material portions 2b, 2b is narrowed. A can be bent more than a right angle.
[0023]
At this time, in the inner peripheral wall portion A2 bent in a concave arc shape, one end is integrally fused to the band-shaped material portions 2b, 2b together with the approach of the adjacent hard synthetic resin cord-shaped material portions 2b, 2b. The helical belt-shaped material portions 2a, 2a made of the hard synthetic resin, which are polymerized with each other, tend to rise in the inner diameter direction.
[0024]
Therefore, this synthetic resin pipe A is used as a supply pipe for hard objects B such as coins and pachinko balls, and as shown in FIG. When the hard material B is fed in a direction from the base end side fixed (fused) to the helical cord-shaped material 2B to the band-shaped material portion 2a toward the free end portion, the helical band made of the hard synthetic resin is formed. The hard material B is smoothly fed while sliding or rolling on the inner surface of the inner peripheral wall 2 composed of the material portion 2a. At this time, since the inner peripheral wall 2 is made of a hard synthetic resin, the inner peripheral wall 2 exhibits abrasion resistance and can withstand long-term use with almost no damage despite sliding or abutting of the hard material B. Noise generated due to collision between hard objects and the like can be reliably prevented from leaking to the outside by the soft synthetic resin pipe 1 entirely covering the inner peripheral wall 2, and the surrounding environment can be improved. . The synthetic resin pipe A can also be used as a transport pipe for pneumatically transporting pebbles, earth and sand, or other aggregates and hard materials.
[0025]
Next, a method of manufacturing the synthetic resin pipe A having the above-described structure will be briefly described with reference to FIG. 4. The rigid synthetic resin strip 2A made of a semi-molten hard vinyl chloride resin having a fixed width and thickness. After being cooled to a temperature below the melting point on the way while being extruded from the first forming nozzle 21, the ′ is subsequently placed on one side of the strip 2 a ′ preceding the base end of the forming rotary shaft 20. The other side portion of the strip-shaped material portion 2a 'is spirally wound at a constant pitch while being overlapped without fusing, and a second forming nozzle 22 is provided on one end of the spiral strip-shaped material portion 2a'. While extruding a rigid synthetic resin string 2B made of a rigid vinyl chloride resin in a semi-molten state having a flat rectangular cross section from the above, it is spirally wound at a constant pitch with the same pitch as the above pitch, and a spiral band shape Of the part 2a ' The inner peripheral wall 2 is formed by being integrally fused to one end.
[0026]
Furthermore, while extruding a soft synthetic resin strip 11 made of soft vinyl chloride resin in a semi-molten state having a certain width and thickness from the third molding nozzle 23, it is spirally wound at the same pitch as described above, and one end thereof is hardly synthesized. Spiral is formed at a constant pitch while being integrally fused to the resin cord 2B and overlapping the other side of the succeeding strip 11a on one side of the preceding strip 11a and welding them together. The flexible synthetic resin tube 1 is formed by winding in a shape. In this manner, a synthetic resin tube having the soft synthetic resin tube 1 provided on the outer peripheral surface of the hard synthetic resin inner peripheral wall 2 is continuously manufactured on the molding rotary shaft 20, cut into desired lengths, and cut into predetermined lengths. A synthetic resin tube A is obtained.
[0027]
In the synthetic resin pipe A, a hard synthetic resin cord-like material 2B spirally fused and integrated with the inner peripheral surface of the soft synthetic resin pipe 1 as the hard synthetic resin inner peripheral wall 2, A rigid synthetic resin strip 2A formed by fusing and integrating the outer surface of one end portion of the rigid member 2B into a single piece, but without using the hard synthetic resin cord 2B, the hard synthetic resin strip is used. The inner peripheral wall 2 may be formed by directly and spirally fusing and integrating the outer surface of one end of the 2A with the inner peripheral surface of the soft synthetic resin tube 1.
[0028]
In this case, the hard synthetic resin strip 2A may be formed so as to have a constant thickness as a whole, but one end to be fused to the inner peripheral surface of the soft synthetic resin pipe 1 is connected to another part. The inner peripheral wall 2 may be formed by spirally winding the thick part directly on the inner peripheral surface of the soft synthetic resin tube 1 at a constant pitch while being fused. . In any case, the synthetic resin tube A bends a predetermined portion in the length direction into an arc shape by an external force and then restores the original straight pipe shape when the external force is released.
[0029]
FIG. 5 shows another embodiment of the synthetic resin tube of the present invention. In the synthetic resin tube A having flexibility and inner surface abrasion resistance shown in FIG. Although the inner peripheral wall 2 is formed only by the spiral winding of the hard synthetic resin strip 2A on the inner surface side, in this embodiment, the outer periphery of the soft synthetic resin pipe 1 in the synthetic resin pipe A shown in FIG. A pressure-resistant, wear-resistant outer peripheral wall 3 having flexibility formed by a spiral winding of a hard synthetic resin strip 3A is also formed on the surface.
[0030]
That is, the inner peripheral wall 2 is formed on the outer peripheral surface of the soft synthetic resin pipe 1 having the inner peripheral wall 2 formed by spirally winding the hard synthetic resin cord 2B and the hard synthetic resin strip 2A on the inner peripheral surface. The hard synthetic resin string material 3B having the same material and the same cross-sectional shape as the hard synthetic resin string material 2B is connected to the outer surface of the hard synthetic resin string material 2B on the inner peripheral side via the soft synthetic resin tube 1. The hard synthetic resin cord 2B is spirally wound at the same overlapping pitch as the hard synthetic resin cord 2B at the overlapping position and the inner surface thereof is fused to the outer peripheral surface of the soft synthetic resin pipe 1. The inner surface of one end of one long side of the hard synthetic resin strip 3A having the same material and the same width and the same shape as the hard synthetic resin strip 2A forming the inner peripheral wall 2 on the outer surface is integrally formed by fusion. And soft with the same pitch as the string 3B made of hard synthetic resin Forming the outer peripheral wall 3 and wound helically along the outer surface of the synthetic resin-made tube 1.
[0031]
Accordingly, a spiral tongue-shaped spiral band 3a formed by one turn in the spiral direction of the synthetic resin band 3A, and a cross-sectional tongue formed by continuous winding to the spiral band 3a. The helical band-shaped material portion 3a has a structure similar to the hard synthetic resin band material 2A constituting the inner peripheral wall 2 and is superimposed in a scale-like cross section with a helical pitch P shifted from each other in the tube axis direction. Has become.
[0032]
The outer peripheral wall 3 also includes a hard synthetic resin cord 3B spirally integrated with the outer peripheral surface of the soft synthetic resin pipe 1 and an inner surface of one end portion of the cord 3B. The hard synthetic resin strip 3A is formed from the hard synthetic resin strip 3A, but the inner surface of one end of the hard synthetic resin strip 3A is directly applied to the soft synthetic resin without using the hard synthetic resin strip 3B. The outer peripheral wall 3 may be formed by being spirally fused and integrated with the inner peripheral surface of the tube 1. In this case, the hard synthetic resin strip 3A may be formed so as to have a constant thickness as a whole, but one end to be fused to the outer peripheral surface of the soft synthetic resin pipe 1 is formed by another part. The outer peripheral wall 3 may be formed by spirally winding at a constant pitch while directly fusing the thick part to the outer peripheral surface of the soft synthetic resin tube 1.
[0033]
The synthetic resin tube A ′ thus configured can cover and protect the soft synthetic resin tube 1 entirely with the outer peripheral wall 3 made of a hard synthetic resin to prevent damage or breakage. The inner peripheral wall 2 made of a hard synthetic resin exhibits a large pressure resistance and can be used for a long period of time, and the soft synthetic resin tube 1 can always be kept in a circular cross section.
[0034]
Further, when the synthetic resin pipe A ′ is bent as shown in FIG. 6, the outer peripheral wall portion A1 of the pipe curved in a convex arc shape is tensioned due to a tensile force generated in the pipe axis direction, but is hardened. The hard synthetic resin strips 2A, 3A forming the resin inner and outer peripheral walls 2, 3 are formed such that the adjacent spiral strips 2a, 2a and the spiral strips 3a, 3a have a width of the spiral pitch P. Since they are sequentially overlapped in a state of being shifted in the tube axis direction, the helical band-shaped portions 2a, 2a made of hard synthetic resin having a tongue-shaped cross section forming the inner peripheral wall 2 are pressed against each other more firmly, The helical band-shaped member 3a made of hard synthetic resin having a tongue-shaped cross section that forms the outer peripheral wall 3 is only slightly deformed in the direction in which it is erected, and is superimposed on the string-shaped material 3B made of hard synthetic resin. To maintain.
[0035]
Also, in the inner peripheral wall portion A2 of the tube curved in a concave arc shape, the soft synthetic resin tube portion between the adjacent hard synthetic resin string members 2b and 2b (between 3b and 3b) is loosened. The spiral synthetic resin-made spiral band portions 3a, 3a having a curved tongue shape and forming the outer peripheral wall 3 are pressed against each other more strongly, while the inner tongue shape is formed. The hard synthetic resin spiral belt-shaped material portion 2a can be slightly deformed in the upright direction, maintain a state of being overlapped with each other on the hard synthetic resin cord material 3B, and greatly curve the entire pipe. You can do it.
[0036]
【The invention's effect】
As described above, in the synthetic resin tube of the present invention, as described in claim 1, a hard synthetic resin strip is fixed to the inner peripheral surface of the soft synthetic resin tube only at the outer surface at one end on the long side thereof. Since the inner peripheral wall is formed in such a manner that spiral belt-shaped material portions having a tongue-shaped cross-section adjacent to each other are spirally fixed at a pitch and overlap with each other in a state of being sequentially shifted in the tube axis direction by a width equal to the pitch described above. The inner peripheral wall made of the hard synthetic resin allows the synthetic resin pipe to exhibit uniform pressure resistance over the entire length and to form an inner surface excellent in wear resistance, and further, covers the inner peripheral wall. The tube made of the soft synthetic resin can always be kept in a circular cross section.
[0037]
Further, the spiral band-shaped material portions having a tongue-shaped cross section forming the inner peripheral wall made of a hard synthetic resin are sequentially overlapped in a scale-like cross section in a state of being shifted in the tube axis direction, and only one end thereof is made of the soft material. Since the synthetic resin pipe is fixed to the inner peripheral surface, when the pressure-resistant synthetic resin pipe is bent, the hard synthetic resin strips slide against each other while expanding and contracting the soft synthetic resin pipe in the pipe axis direction. The inner peripheral surface of the soft synthetic resin pipe can be moved smoothly and greatly bent, and even when bent to a large angle, the adjacent hard synthetic resin band-shaped material portions keep the overlapping state with each other. An object of the present invention is to provide a pressure-resistant synthetic resin pipe which can be easily piped without danger of intrusion of impurities or foreign matter into the side and can withstand long-term use.
[0038]
In addition, even when bent, the inner surface of the pipe exhibits abrasion resistance and pressure resistance due to the hard synthetic resin inner peripheral wall over the entire length, and this synthetic resin pipe is used as a feed pipe for hard objects such as coins In this case, the inner surface is hardly damaged, and the hard material can be smoothly fed from one end side of the spiral band-shaped material portion having a tongue-shaped cross section to the other end side without causing a caught or the like. In addition, noise can be reliably prevented from leaking to the outside due to the soft synthetic resin pipe entirely covering the inner peripheral wall.
[0039]
Furthermore, the synthetic resin tube can be used to easily transport aggregates such as stones and earth and sand by fluid, and even during the transport, as described above, the spiral made of the hard synthetic resin forming the inner peripheral wall. Since the belt-like members always keep the state where they overlap each other, smooth movement of the fluid while reliably preventing earth and sand from moving and staying on the inner surface side of the soft synthetic resin pipe through the spiral belt-like members. Transport can be enabled.
[0040]
According to the second aspect of the present invention, in the synthetic resin pipe, a hard synthetic resin string-like material is spirally fused and fixed at a constant pitch to the inner peripheral surface of the soft synthetic resin pipe. The outer surface of one end of the long side of the hard synthetic resin strip formed on the hard synthetic resin cord is wider than the pitch between the hard synthetic resin cords at the same pitch as above, and is spirally formed. Since it is fused and integrated, it is possible to provide a structure of a synthetic resin pipe which is easy to manufacture and suitable for mass production, and a hard synthetic resin string spirally wound around an outer peripheral surface of a soft synthetic resin pipe. The pressure-resisting strength is increased by the shape member, and a synthetic resin tube in which crushing deformation hardly occurs can be configured.
[0041]
On the other hand, the invention according to claim 3 is that, like the inner peripheral wall formed on the inner peripheral surface of the soft synthetic resin pipe, a hard synthetic resin belt-like material is formed on the outer peripheral surface of the soft synthetic resin pipe. Only the inner surface of one end on the side is spirally fixed at a constant pitch, and adjacent spiral band-shaped material portions having a tongue-shaped cross-section are overlapped in a state of being sequentially shifted in the tube axis direction by a width equal to the pitch. Since the outer peripheral wall is formed, the flexible synthetic resin pipe is entirely covered and protected by this hard synthetic resin outer wall while maintaining the flexibility and flexibility of the pipe to prevent damage or breakage. In addition, the inner peripheral wall made of a hard synthetic resin band-like material exhibits a large pressure resistance and can be used for a long time.
[Brief description of the drawings]
FIG. 1 is a simplified side view in which a part of a part of a synthetic resin pipe of the present invention is sectioned;
FIG. 2 is a simplified side view in which a part of a bent state is sectioned;
FIG. 3 is a simplified vertical side view showing an example of a use state;
FIG. 4 is a simplified side view for explaining a manufacturing method;
FIG. 5 is a partially simplified side view showing a cross section of a part showing another embodiment of the present invention;
FIG. 6 is a simplified side view in which a part of a bent state is sectioned.
[Explanation of symbols]
A synthetic resin pipe
1 Pipe made of soft synthetic resin
2 Inner peripheral wall made of hard synthetic resin
2A Hard synthetic resin strip
2a Spiral band material
2B String material made of hard synthetic resin
3 Hard synthetic resin outer wall
3A Hard synthetic resin strip
3B String material made of hard synthetic resin

Claims (4)

On the inner peripheral surface of the soft synthetic resin pipe, a hard synthetic resin strip is spirally fixed at a constant pitch only at the outer surface at one end on the long side thereof, and the adjacent spiral strip having a tongue-shaped cross section is fixed. A synthetic resin pipe having flexibility and inner surface abrasion resistance, wherein inner pipes are formed so as to overlap with each other in such a manner that they are sequentially shifted in the pipe axis direction by a width equal to the pitch described above. A hard synthetic resin cord is spirally fused and fixed at a constant pitch to the inner peripheral surface of the soft synthetic resin pipe, and the hard synthetic resin cord is attached to the hard synthetic resin cord. The outer surface of one end of the long side of the hard synthetic resin strip formed wider than the pitch between the strips is spirally fused at the same pitch as above and integrated to form an inner peripheral wall. The synthetic resin tube having flexibility and inner surface abrasion resistance according to claim 1. As with the inner peripheral wall formed on the inner peripheral surface of the soft synthetic resin pipe, the hard synthetic resin band-like material is formed on the outer peripheral surface of the soft synthetic resin pipe at a constant pitch only at the inner surface at one end on the long side. The outer peripheral wall is formed in such a manner that spiral belt-shaped material portions having a tongue-shaped cross section that are fixed in a spiral shape and adjacent to each other are overlapped in a state of being sequentially shifted in the tube axis direction by a width equal to the pitch. 3. The synthetic resin pipe having flexibility and inner surface abrasion resistance according to claim 1 or 2. A hard synthetic resin cord is spirally fused and fixed at a constant pitch to the outer peripheral surface of the soft synthetic resin pipe, and the hard synthetic resin cord is attached to the hard synthetic resin cord. The inner peripheral surface of one end of the long side of the hard synthetic resin band formed wider than the pitch between the members is spirally fused and integrated at the same pitch as above to form an outer peripheral wall. The synthetic resin tube having flexibility and inner surface abrasion resistance according to claim 3, characterized in that:

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