JP2004197797A - Synthetic resin-made hose for pipe joint, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a soft synthetic resin made hose for a pipe joint capable of easily and watertightly connecting pipe bodies such as hard synthetic resin made drain pipe having flange parts on an end part thereof. <P>SOLUTION: Flange parts 2, 2 made of same soft synthetic resin as a hose main body 1 and having a constant thickness are provided on both opening parts of the soft synthetic resin made hose main body 1 having reinforcement spiral projection 4 provided on an outer circumference surface thereof, as one body. The flange part 2 is joined to the flange part of the pipe body such as the hard synthetic resin made drain pipe to be connected, and is gripped from a back surface side by a pair of ring members. The pipe bodies are connected by fastening the ring members by bolts and nuts. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible synthetic resin hose for a pipe joint, which is provided with an annular flange made of a soft synthetic resin having a constant thickness at an open end, and a method of manufacturing the same.
[0002]
[Prior art]
Conventionally, for example, a flexible synthetic resin corrugated tube or a bellows tube made of a soft synthetic resin such as a soft vinyl chloride resin has been used as a connecting short pipe for connecting hard synthetic resin drain pipes to be piped outdoors or the like. Although a pipe is employed, according to such a flexible pipe, the inner peripheral surface is formed in a spiral or bellows-like uneven surface, so that not only is drainage not performed smoothly, There is a problem that impurities and the like adhere to and accumulate in the concave portions and cannot be used for a long time.
[0003]
On the other hand, a pressure-resistant tube made of a soft synthetic resin in which a reinforcing spiral ridge is wound around an outer peripheral surface of a tube wall having an inner peripheral surface formed into a smooth surface is also known. When formed into a hose for a pipe joint, and the end of this hose for a pipe joint is inserted into a drain pipe to be connected, water leaks along the spiral groove formed between the reinforcing spiral ridges, Therefore, after a suitable filler is buried in the spiral groove to form the outer peripheral surface of the hose at a flat surface, the connection port member must be fitted and fixed. There is a problem that the cost is increased due to the labor required.
[0004]
For this reason, the present inventors have formed the inner and outer peripheral surfaces to be smooth surfaces at both ends of a soft synthetic resin hose having a constant length and having the inner peripheral surface formed as a smooth surface over the entire length. A soft synthetic resin hose has been developed in which a short pipe portion for a pipe joint is integrally provided, and a reinforcing helical protrusion is integrally provided on the outer peripheral surface of the hose between the short pipe sections for the pipe joint (for example, see Patent Document 1). ).
[0005]
[Patent Document 1]
JP-A-2002-286172 (page 4, FIG. 1).
[0006]
[Problems to be solved by the invention]
However, according to such a soft synthetic resin hose, the short cylindrical portions formed at both ends thereof are inserted into the open end of the synthetic resin drainage pipe via an adhesive or a sealing material, Although the short cylindrical portion is formed to have a large diameter, the synthetic resin drainage pipe can be connected in a watertight state by inserting the open end of the synthetic resin drainage tube into the short cylindrical portion via an adhesive or a sealing material. However, there is a problem that a drain pipe or a drain port in which a flange portion is integrally formed at an opening end cannot be connected to the flange portion by the short tube portion as described above.
[0007]
The present invention has been made in view of the above-described problems, and has as its object the purpose of a pipe such as a drain pipe having a flange portion at an open end or a drain port such as a water supply tank. An object of the present invention is to provide a synthetic resin hose for a pipe joint that can be easily and accurately connected, and a method for efficiently producing the synthetic resin hose for a pipe joint.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a synthetic resin hose for a pipe joint according to the present invention has an inner peripheral surface formed into a smooth surface over the entire length and reinforced on an outer peripheral surface. A soft synthetic resin hose provided with a reinforcing spiral ridge having a core wire, wherein an annular flange made of a soft synthetic resin having a constant thickness protruding in an outer diameter extension direction at an open end of the soft synthetic resin hose. It is characterized by having a structure in which the parts are provided integrally.
[0009]
Further, in the synthetic resin hose for a pipe joint, the invention according to claim 2 is characterized in that an annular flange portion is provided at both open ends of the main body of the synthetic resin hose. The annular flange portion is provided at an open end on one end side of the synthetic resin hose main body, and a short cylindrical connection port portion having an inner and outer peripheral surface formed into a smooth surface is formed at the open end on the other end side. It is characterized by the following.
[0010]
The invention according to claim 4 is the method for manufacturing the above-mentioned synthetic resin hose for a pipe joint, wherein a semi-molten soft synthetic resin strip is polymerized and fused on a forming rotary shaft at a constant pitch. While spirally winding the inner surface to form a tube wall having the same diameter over the entire length, a reinforcing core wire is spirally wound at a constant pitch on the outer peripheral surface of the tube wall, and the reinforcing core wire is semi-melted. Forming a soft synthetic resin hose of a certain length by forming a reinforcing spiral ridge having a reinforcing core wire by covering with a soft synthetic resin band material in a state, and forming the soft synthetic resin hose Subsequent to the process, an aspherical ball-shaped molding member having both front and rear surfaces formed into frustoconical surfaces is movably covered on the molding rotary shaft, and the semi-molten soft synthetic resin is formed on the molding member. Heavy weight of the strip at a constant pitch Forming a pair of front and rear inclined flanges connected in a belly-like manner by fusing, the molding process of the soft synthetic resin hose and the molding process of the soft synthetic resin inclined flange portions are alternately performed. On the other hand, the front and rear inclined flange portions are sequentially cut off from the continuous portion, and a molded member is extracted from the divided section, thereby manufacturing a hose having a fixed length provided with inclined flange portions at both ends, Thereafter, the inclined flange portion is further expanded in a direction in which the inclined flange portion stands up to form an annular flange portion.
[0011]
[Action]
The synthetic resin hose for a pipe joint is provided integrally with an annular flange portion made of a soft synthetic resin having a certain thickness at the opening end. When connecting to a pipe such as a drain pipe or a connection port of a water supply tank, the flange of these hoses and the flange of the pipe or the connection port are joined in abutting manner, and the back of the flange is connected. A ring member is arranged on each side, these flanges are sandwiched between the opposing surfaces of both ring members, and several places between the ring members are tightened with bolts and nuts, and a hose made of synthetic resin for pipe joints and drainage Connection with a pipe such as a pipe or a connection port such as a water supply tank is easily and firmly performed.
[0012]
Further, even if the opening end and the connection port of the pipe body such as the drain pipe are slightly opened in an oblique direction, the synthetic resin hose for the pipe joint described above can be used with respect to the flange portion integrally provided at the opening end. The flange can be securely connected by being surface-bonded to a flange such as a tubular body while elastically deforming the flange.
[0013]
In addition, since the flange portion of the synthetic resin hose for a pipe joint is formed of a soft synthetic resin, the hose is elastically and densely pressed against the entire flange portion of the pipe or the like, and exhibits a good watertight effect. Since the inner peripheral surface of the synthetic resin hose for a pipe joint is formed in a smooth surface, drainage and the like can be circulated smoothly.
[0014]
In addition, since the hose for fittings is made of a soft synthetic resin, it exhibits good flexibility and bendability, and when connecting pipes such as a drain pipe, for example, these pipes are slightly attached to the pipe shaft. Even if they face each other, they can easily and accurately match the connection ports of both ends to the opening ends of the facing pipes, and of course, provide a reinforcing spiral ridge with a reinforcing core on the outer peripheral surface. As a result, the pressure resistance increases, and there is no fear that even when buried in the ground, it is deformed flat due to earth pressure.
[0015]
On the other hand, the method of manufacturing a synthetic resin hose for a pipe joint involves forming a soft synthetic resin hose having a predetermined length on a forming rotary shaft, and performing the forming rotation after the forming process of the soft synthetic resin hose. An abacus ball-shaped molding member, whose front and rear surfaces are formed as frustoconical surfaces, is slidably covered on the shaft, and the semi-molten soft synthetic resin strip is fixed on the molding member at a constant pitch. Since it is intended to be polymerized and fused, the end of the soft synthetic resin hose is continuously connected to the end of the soft synthetic resin strip having a constant thickness covering the surface of the abacus ball-shaped molded member. The pair of front and rear inclined flange portions can be formed accurately and efficiently.
[0016]
Further, by cutting the front and rear inclined flange portions and extracting the molded member from the divided cross section, a flexible synthetic resin hose of a predetermined length having the inclined flange portions integrally provided at both ends opening can be efficiently mass-produced. In addition to this, after manufacturing the soft synthetic resin hose, the inclined flange portions at both ends of the hose are expanded in a direction perpendicular to the pipe axis, so that the hard synthetic resin hose having the flange portion at the open end or It can be formed into an annular flange portion that can be accurately surface-bonded to the flange portion of the metal tube.
[0017]
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 shows a side view in which a part of a synthetic resin hose A for a pipe joint is cross-sectioned. A is a fixed thickness made of the same synthetic resin material at both ends of a flexible synthetic resin hose main body 1 made of an olefin resin such as EVA resin, polyethylene or polypropylene resin, or a soft synthetic resin such as vinyl chloride resin. Is formed into a short hose having a length of about 50 cm to 2 m integrally forming the annular flange portions 2.
[0018]
Further, the synthetic resin hose main body 1 is formed by integrally forming a reinforcing spiral ridge 4 on an outer peripheral surface of a tube wall 1a having an inner peripheral surface formed on a flat surface 3 having the same diameter over the entire length, The reinforcing spiral ridge 4 is provided with a synthetic resin reinforcing core wire 5 having a suitable elasticity and hardness, such as polypropylene, polyethylene or hard vinyl chloride, having a circular or elliptical cross section. Note that the synthetic resin reinforcing core wire 5 may be integrated with the reinforcing spiral ridge 4, that is, the reinforcing spiral ridge 4 may be provided with the synthetic resin reinforcing core wire 5.
[0019]
On the other hand, the annular flange portions 2 and 2 provided integrally at both ends of the hose main body 1 are bent from the open end of the hose main body 1 in the direction in which the outer diameter extends, and stand upright with respect to the tube axis. It is opened in a state of being greatly inclined in the direction, and its inner and outer surfaces (front and rear surfaces) are formed as smooth surfaces. The reinforcing core wire 5 contained in the reinforcing spiral ridge 4 of the hose main body 1 is continuously embedded in the flange portions 2 and 2 from the end of the hose main body 1 while gradually decreasing in diameter. Therefore, the front and rear surfaces of the flange portions 2 and 2 are formed as flat surfaces that are smoothly continuous from the outer peripheral surface and the inner peripheral surface of the hose main body 1, respectively.
[0020]
FIG. 2 is a partially longitudinal side view showing another embodiment of a synthetic resin hose A 'for a pipe joint according to the present invention. In the above embodiment, both ends of a soft synthetic resin hose main body 1 are shown. In this embodiment, an annular flange portion 2 also made of a soft synthetic resin is provided at an open end on one end side of a main body 1 made of a soft synthetic resin. On the other hand, a short cylindrical soft synthetic resin connection port 2A whose inner and outer peripheral surfaces are formed in a smooth surface is formed at the open end on the other end side.
[0021]
The hose main body 1 in the synthetic resin hose A 'for a pipe joint is made of a tube made of an olefin resin such as an EVA resin, a polyethylene or a polypropylene resin, or a soft synthetic resin such as a vinyl chloride resin, as in the above embodiment. An annular flange portion 2 integrally formed on one end with a reinforcing helical ridge 4 integrally including a synthetic resin reinforcing core wire 5 in a continuous spiral shape on the outer peripheral surface of the wall 1a is provided. The hose main body 1 is bent from the opening end of the main body of the hose toward the outer diameter extension direction and widened in a state of being greatly inclined in a direction of standing upright with respect to the pipe axis, and its front and rear surfaces are formed as smooth flat surfaces. .
[0022]
On the other hand, the short cylindrical connection port 2A provided on the other end side of the hose main body 1 has an inner diameter that is larger than the inner diameter of the tube wall 1a of the hose main body 1 over the entire length in the figure. However, they may be formed to have the same diameter.
[0023]
Next, a method for producing the above-mentioned synthetic resin hose A for pipe joints in which annular flange portions 2 and 2 are provided at both ends of the hose main body 1 will be described with reference to FIGS. First, as shown in FIG. 3, a belt-shaped material 11 made of a soft synthetic resin such as a soft vinyl chloride resin in a semi-molten state having a certain width is extruded from a first forming nozzle 21 while a base of a metal forming rotary shaft 20 is well known. The pipe is formed by spirally winding at a constant pitch while overlapping and integrally welding the opposite side of the succeeding strip 11b on one side of the preceding strip 11a on the end. While forming the wall 1a, while the tube wall 1a is being formed, a reinforcing core wire 5 made of synthetic resin such as polyethylene, polypropylene, hard vinyl chloride or the like having a fixed diameter and having a fixed diameter is extruded from the second forming nozzle 22. The outer peripheral surface of the tube wall 1a is reinforced by winding spirally on the previously wound synthetic resin strip 11a and covering the synthetic resin strip 11b to be wound next on the reinforcing core wire 5. Hollow with core wire 5 Continue to form a strong spiral ridge 4.
[0024]
A tube wall 1a is formed on a molding rotary shaft 20 by a semi-molten soft synthetic resin strip 11 having a constant width, and a reinforcing core wire 5 is spirally wound on the tube wall 1a. The above-mentioned hollow reinforcing spiral ridge 4 may be formed by spirally winding a semi-molten soft synthetic resin strip having another constant width on the upper side.
[0025]
Thus, a synthetic resin hose formed by forming the tube wall 1a on the forming rotary shaft 20 and forming the hollow reinforcing spiral ridge 4 having the synthetic resin reinforcing core wire 5 on the outer peripheral surface of the tube wall 1a. While manufacturing the main body 1, the synthetic resin hose main body 1 is continuously fed forward on the molding rotary shaft 20 toward the front end. When the synthetic resin hose main body 1 having a predetermined length is formed, a molding member 6 for forming inclined flange portions 2a, 2a thicker than the tube wall 1a is formed at both ends of the hose main body 1. It is arranged on the forming rotary shaft 20.
[0026]
As shown by a two-dot chain line in FIG. 4, the molded member 6 is formed by combining the one half 6A and the other half 6B that are bisected along the axis so that both front and rear surfaces have a small diameter from the center toward the front and rear ends. It has a side abacus ball shape formed on a truncated conical surface 61, 62 that is steeply inclined in the direction in which the half-circle is formed over the entire length of the joint surface between the first half 6A and the other half 6B. A through-hole is formed on the forming rotary shaft 20 by covering the forming rotary shaft 20 and joining the through-holes to each other so as to form a circular hole. A small width ring-shaped flat surface 63 is formed between the opposite ends of the front and rear frusto-conical surfaces 61 and 62 of the molded member 6.
[0027]
In addition, for joining and connecting the first half 6A and the other half 6B, a dovetail groove is provided on one of the opposed joint end faces, and a ridge is provided on the other side so as to be removably engaged with the dovetail groove over the entire length. Any suitable engagement means such as the above, or a structure in which the inner surface is slidably engaged with the forming rotary shaft 20 may be used.
[0028]
After the molded member 6 configured as described above is mounted on the base end of the molding rotary shaft 20, the first molding nozzle 21 moves the hose on the molding rotary shaft 20 while synchronizing with the rotation of the hose body 1 during manufacturing. It is fed to the manufacturing section by an appropriate pushing means, and is joined to the rear end of the synthetic resin hose main body 1 manufactured to a predetermined length in abutting manner as shown in FIG. Then, the synthetic resin band-shaped material 11 in the semi-molten state, which is being pushed out of the first molding nozzle 21 and is manufacturing the rear end portion of the synthetic resin hose main body 1, is on the front side (leading side) of the molded member 6. It is continuously spirally wound on the frusto-conical surface 61.
[0029]
At this time, the semi-molten synthetic resin strip 11 extruded from the first molding nozzle 21 is extruded by increasing its thickness, and the thick strip 11 ′ is formed into a truncated cone on the front side of the molding member 6. From the shape surface 61 to the rear frusto-conical surface 62 via the ring-shaped flat surface 63, the opposing portion of the succeeding band-shaped material portion is superimposed on one side portion of the preceding band-shaped material portion and continuously. By winding spirally and fusing them together, the front and rear truncated conical surfaces 61 and 62 are made of a soft synthetic resin connected in a belly-like manner via a ring portion 2b formed on a ring-shaped flat surface 63 with each other. The thick inclined flange portions 2a, 2a are formed.
[0030]
Further, when forming the inclined flange portions 2a, 2a, the synthetic resin reinforcing core wire 5 in a semi-molten state is extruded from the second forming nozzle 22 while being formed into a small diameter 5a, and these inclined flange portions 2a, 2a, It is buried in a semi-molten synthetic resin strip 11 'forming 2a.
[0031]
That is, when a synthetic resin band 11 ′ in a semi-molten state is spirally wound around the outer peripheral surface of the molded member 6, the subsequent band is formed on one side of the preceding band in the same manner as when the hose main body 1 is manufactured. The opposite side portions of the material portions are overlapped and integrally welded, spirally wound at a constant pitch, and the small-diameter synthetic resin reinforcing core wire 5a is inserted between these band-shaped material portions. However, while the strip-shaped material 11 ′ is thick, the reinforcing core wire 5 a is smaller in diameter than when the reinforcing spiral ridge 4 is formed, so that the reinforcing core wire 5 a is buried in the strip-shaped material portion and It does not protrude.
[0032]
In this manner, the forming rotary shaft 20 is formed by spirally winding the band-shaped material 11 'made of semi-molten synthetic resin on the forming member 6 so as to form a bellows-like continuous front and rear inclined flange portions 2a, 2a having a constant thickness. When the thick band-shaped material 11 'reaches the inner end of the rear frusto-conical shape 62 of the molded member 6 with the advance of the molded member 6 moving forward together with the hose body 1, FIG. As shown in the figure, the strip-shaped material is again spirally wound on the forming rotary shaft 20 while being extruded in a state where the thickness thereof is reduced, and the reinforcing spiral ridge 4 is provided on the outer peripheral surface as described above. The subject 1 is formed. At this time, the hose main body 1 is formed while extruding the reinforcing core wire in a semi-molten state as the original large-diameter core wire 5 from the second forming nozzle 22.
[0033]
In this manner, the front and rear inclined flange portions 2a, 2a continuously connected to the hose body 1 of a fixed length and the belly-like shape on the forming rotary shaft 20 are formed alternately and continuously. The hose body 1 and the front and rear inclined flange portions 2a, 2a sent out to the outside are cooled and hardened by cooling water jetted from a cooling device 25 disposed outside the forming rotary shaft 20, and then further advanced. A small-width ring-shaped flat surface 63 connecting between the front and rear inclined flange portions 2a, 2a is cut off by a rotary cutting blade 26 arranged on the outer peripheral side of the tip side of the forming rotary shaft 20, and the front and rear inclined flange portion 2a , 2a.
[0034]
Thereafter, when the hose body 1 is pulled out from the forming rotary shaft 20 in the traveling direction of the hose body 1, the forming member 6 is separated from the front and rear inclined flange portions 2a, 2a, and as shown in FIG. A synthetic resin hose A having inclined flange portions 2a, 2a integrally provided at both ends is obtained. The molded member 6 detached from the front and rear inclined flanges 2a and 2a is transferred again to the base end side of the forming rotary shaft 20 and used for forming the front and rear inclined flanges 2a and 2a.
[0035]
Next, the synthetic resin hose A having the predetermined length is connected to the flange portion of a rigid synthetic resin drain pipe or the like to be connected by further expanding the inclined flange portions 2a, 2a at both ends in a rising direction. It is formed on the annular flange portions 2, 2 that can be surface-joined.
[0036]
The expansion of the inclined flanges 2a, 2a is performed by heating the inclined flanges 2a for a certain period of time while holding the entire inclined flanges 2a with a hot plate and deforming the inclined flanges 2a in a direction perpendicular to the tube axis, and then cooling. However, another method may be adopted, such as performing a spreading treatment while immersing the film in heated oil.
[0037]
As shown in FIG. 1, the synthetic resin hose A for a pipe joint obtained in this manner has a reinforcing helical projection formed on the outer peripheral surface of a pipe wall 1a having an inner peripheral surface formed on a flat surface 3 having the same diameter over the entire length. It has a structure in which annular flanges 2 and 2 having front and rear surfaces formed as flat surfaces are integrally provided at both ends of a hose main body 1 having a predetermined length formed by integrally forming the strip 4. I have.
[0038]
As an example of using the flexible synthetic resin hose A for a pipe joint having flexibility configured as described above, as shown in FIG. 7, for example, as shown in FIG. When the synthetic resin drain pipes B, B are laid, they are used to connect between the flange portions b, b of these hard synthetic resin drain pipes B, B.
[0039]
That is, both end flange portions 2, 2 of the soft synthetic resin hose A are joined to the opposed flange portions b, b of the hard synthetic resin tubes B, B, respectively. At this time, ring members C, C made of a metal plate or a hard synthetic resin plate are arranged in advance in the vicinity of the flange portion of the soft synthetic resin hose A and the drain pipe B, and these ring members C, C Is brought into contact with the back surfaces of the flange portions 2 and b so that the flange portions 2 and b are sandwiched between the opposing surfaces of the ring members C and C.
[0040]
In this state, as shown in FIG. 8, a bolt D is inserted between a plurality of bolt mounting holes c provided in the outer peripheral portion of the ring members C, and the nut E is screwed, so that the soft synthetic resin is formed. The flange portion 2 of the hose A is elastically pressed against the flange portion b of the drain pipe B, and the hose A and the drain pipe B are connected in a watertight manner. Since the flange portion 2 of the soft synthetic resin hose A is made of the same material as the hose A, the flange portion 2 is elastically pressed against the flange portion b of the hard synthetic resin drain pipe B as described above. Although they are joined in a watertight manner, a packing material may be separately provided as necessary. In addition to the connection between pipes, the hose A made of a synthetic resin for a pipe joint of the present invention may be connected to a drain port (connection port) having a flange portion at an open end of a water supply tank or the like in the same manner as described above. Of course you can.
[0041]
Next, as shown in FIG. 2, an annular flange portion 2 also made of a soft synthetic resin is provided at an open end at one end of a hose main body 1 made of a soft synthetic resin, while an open flange at the other end is provided at an open end at the other end. A method of manufacturing a synthetic resin hose for a pipe joint formed by forming a short cylindrical soft synthetic resin connection port 2A in which the inner and outer peripheral surfaces are formed on a smooth surface will be briefly described with reference to FIG. As described above, the tube wall 1a is formed by spirally winding the semi-molten soft synthetic resin strip 11 on the forming rotary shaft 20 while extruding it from the first forming nozzle 21 and forming the tube wall 1a. On the way, the semi-molten hard synthetic resin reinforcing core wire 5 is spirally wound at a constant pitch, and the semi-molten soft synthetic resin strip 11b is put on the reinforcing core wire 5 to form the tube wall 1a. Hollow with a reinforcing linear object 5 Continue to form a strong spiral ridge 4.
[0042]
Thus, a synthetic resin hose main body 1 having a tube wall 1a formed on the forming rotary shaft 20 and a hollow reinforcing spiral ridge 4 containing a synthetic resin reinforcing core wire 5 formed on the outer peripheral surface of the tube wall 1a. The synthetic resin hose main body 1 is continuously fed forward on the forming rotary shaft 20 toward the front end while manufacturing. When the synthetic resin hose main body 1 having a predetermined length is formed, the abacus-shaped molding member 6 is disposed on the molding rotary shaft 20, and the semi-melted thick soft material is placed on the molding member 6. The synthetic resin strip 11 'is spirally wound and polymerized to form the front and rear inclined flanges 2a, 2a, and then the synthetic resin hose main body 1 having a predetermined length is formed again. Up to this point, the manufacturing method is the same as the above.
[0043]
Next, following the formation of the synthetic resin hose main body 1, instead of the abacus-shaped molding member 6, a cylindrical molding member 6 'formed by combining one half and the other half of a semi-cylindrical shape is formed and rotated. It is slidably disposed on a shaft 20, and a thick semi-molten strip-shaped material 11 'is spirally superimposed and wound on this molded member 6' to form a soft synthetic resin cylindrical body 2 having a constant thickness. Then, a synthetic resin hose main body 1 having a predetermined length is formed again continuously to the cylindrical body portion 2 '.
[0044]
In this manner, every time the synthetic resin hose main body 1 having a predetermined length is molded on the molding rotary shaft 20, the abacus-shaped molding member 6 and the cylindrical molding member 6 'are alternately formed on the molding rotary shaft 20. After a pair of front and rear inclined flange portions 2a, 2a made of a soft synthetic resin and a soft synthetic resin cylindrical body portion 2 'are sequentially formed and continuously formed, the inclined flange portions 2a, 2a are formed as described above. At the same time, the cylindrical body portion 2 'is also separated from the central portion in the length direction by a cutting blade, and an inclined flange portion 2a is connected to one end of a synthetic resin hose main body 1 having a predetermined length, and a short cylindrical shape is connected to the other end. The purpose of the present invention is to obtain a hose A 'made of a soft synthetic resin for a pipe joint having a mouth 2a' integrally provided. The method of expanding the inclined flange portions 2a and 2a to form the annular flange portion 2 is the same as the above method.
[0045]
The short cylindrical connection port 2a 'is molded by using a cylindrical molding member 6', but without using such a molding member 6 ', it is mounted on the molding rotary shaft 20. It may be formed by directly spirally winding a thick soft synthetic resin strip in a semi-molten state to form a cylindrical body having a small diameter reinforcing core wire therein, and dividing the cylindrical body. . In this case, the inner diameter of the former connection port 2 ′ is formed to be larger than the inner diameter of the hose body 1, but according to the latter cylindrical portion, the inner diameter is the same as the inner diameter of the hose body 1. Will be formed.
[0046]
The hose A 'made of a soft synthetic resin for a pipe joint obtained in this manner has the flange 2 provided at one end thereof butt-joined to the flange b of the hard synthetic resin drain pipe B as described above to form a pair of front and rear parts. Of the other drainage pipe B, which is connected to the drainage pipe B by tightening the two ring members C, C with bolts and nuts D, E, while having no flange at the end. In this case, the end of the drain pipe B 'is connected to the connection port 2a' provided at the other end of the hose body 1 by inserting it through an adhesive or a sealing material. .
[0047]
【The invention's effect】
As described above, according to the synthetic resin hose for a pipe joint of the present invention, the inner peripheral surface is formed to be a smooth surface over the entire length, and the reinforcing spiral ridge having the reinforcing core wire is provided on the outer peripheral surface. Since the flexible synthetic resin hose is formed integrally with an annular flange portion made of a soft synthetic resin having a constant thickness and protruding in an outer diameter extending direction at an opening end of the soft synthetic resin hose, As with synthetic resin hoses for pipe joints, these flanges are butt-fitted to pipes such as drain pipes made of hard synthetic resin and flanges at the ends and drain ports such as water supply tanks. If it is clamped with the ring member from the back side of the flange part in the state where it is joined, and tightened with bolts and nuts, the connection between the synthetic resin hose for pipe joints and the pipe, drain port etc. can be done easily and firmly it can.
[0048]
Further, since the flange portion is made of a soft synthetic resin having a constant thickness, the front and rear surfaces of which are formed as flat surfaces, the flange portion provided at an opening end of a pipe such as a drain pipe or a drain port is formed on a pipe shaft. Even if the hose is slightly inclined in the oblique direction, the flange of the synthetic resin hose for a pipe joint can be securely connected to the flange of the pipe or the drain while being elastically deformed. it can.
[0049]
In addition, the flange portion made of this soft synthetic resin is elastically and densely pressed over the entire surface of the drain pipe or the like facing the flange portion of the drainage pipe or the like, and exhibits a good watertightness effect. At the same time, since the inner peripheral surface of the synthetic resin hose for a pipe joint is formed in a smooth surface, drainage and the like can be circulated smoothly.
[0050]
In addition, since the pipe joint hose is made of a soft synthetic resin, it exhibits good flexibility and bendability to connect these pipes such as drain pipes or drain pipes to the pipes. Even if the drainage port is slightly offset from the pipe axis, it can easily and accurately match the connection port at both ends with the open end of the facing pipe or drainage port, of course, on the outer peripheral surface. Is provided with a reinforcing helical ridge having a reinforcing core wire, so that the pressure resistance is increased, and there is no fear of flat deformation due to earth pressure even when buried in the ground.
[0051]
In the pipe joint hose according to the second aspect of the present invention, since the annular flange portion is provided at both open ends of the main body of the synthetic resin hose, the connection and connection between the pipes having the flange portions at the opposite ends are provided. With the pipe joint hose interposed between the mouth and the pipe body, the flange portions joined to each other can be easily and reliably connected to each other by using the above-mentioned pair of ring members and bolts / nuts.
[0052]
On the other hand, according to the invention according to claim 3, the annular flange portion is provided at the open end on one end side of the synthetic resin hose main body, and the inner and outer peripheral surfaces are formed in a smooth surface at the open end on the other end side. Since the short-cylindrical connection port is formed, for example, a pipe having a flange at the end and a pipe having no flange at the end are connected by the pipe joint hose. be able to. That is, for a pipe body having a flange portion at the end, a soft synthetic resin flange portion of a hose for a pipe joint is joined to the flange portion in the same manner as described above by a pair of ring members and bolts / nuts. The rigid end of the pipe can be connected to the connection port of the joint hose by inserting or the like into the pipe having no flange at the end.
[0053]
Further, according to the method for manufacturing a synthetic resin hose for a pipe joint, as described in claim 4, the soft synthetic resin hose having a fixed length is formed on a forming rotary shaft. Subsequent to the forming process of the hose, an abacus ball-shaped forming member having front and rear surfaces formed in a frustoconical shape is slidably covered on the forming rotating shaft, and the semi-molten state is formed on the forming member. The flexible synthetic resin strip is polymerized and fused at a constant pitch, so that the soft synthetic resin hose of constant thickness covers the surface of the abacus ball-shaped molded member continuously at the end of the soft synthetic resin hose. A pair of front and rear inclined flanges connected in a belly-like manner by the synthetic resin strip can be accurately and efficiently formed.
[0054]
Further, by cutting the front and rear inclined flange portions and extracting the molded member from the divided cross section, a flexible synthetic resin hose of a predetermined length having the inclined flange portions integrally provided at the openings at both ends is efficiently mass-produced. In addition to this, after manufacturing the soft synthetic resin hose, the inclined flange portions at both ends of the hose are expanded in a direction perpendicular to the pipe axis, so that the hard synthetic resin hose having the flange portion at the open end or The metal pipe can be formed into an annular flange that can be accurately surface-bonded to the flange.
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view of a soft synthetic resin hose for a pipe joint of the present invention;
FIG. 2 is a partially longitudinal side view showing another embodiment,
FIG. 3 is a simplified side view in which a part of a state in which a hose main body is formed is sectioned;
FIG. 4 is a simplified side view partially showing a state in which an inclined flange portion is formed,
FIG. 5 is a side view showing a state of being divided after cooling.
FIG. 6 is a side view of a hose mainly provided with inclined flange portions at both ends,
FIG. 7 is a simplified exploded side view in which a part showing a use state is sectioned,
FIG. 8 is a longitudinal sectional side view showing a connected state,
FIG. 9 is a partially omitted side view for explaining another manufacturing method.
[Explanation of symbols]
A Hose made of soft synthetic resin
1 hose main body
1a Pipe wall
2 Flange part
2A short cylindrical connection port
4 Reinforced spiral ridge
5 Reinforcing core wire
6 Abacus-shaped molded member
61, 62 frusto-conical surface
11 Soft synthetic resin strip
20 Forming rotary shaft

Claims (4)

A soft synthetic resin hose having an inner peripheral surface formed as a smooth surface over its entire length and provided with a reinforcing spiral ridge having a reinforcing core wire on an outer peripheral surface, wherein an open end of the soft synthetic resin hose is provided. A synthetic resin hose for a pipe joint, wherein an annular flange portion made of a soft synthetic resin having a certain thickness and protruding in a direction in which the outer diameter extends is integrally provided. The synthetic resin hose for a pipe joint according to claim 1, wherein the annular flange portion is provided at both open ends of the main body of the synthetic resin hose. An annular flange portion is provided at an open end on one end side of the synthetic resin hose main body, and a short cylindrical connection port portion whose inner and outer peripheral surfaces are formed on a smooth surface is formed on the open end on the other end side. The synthetic resin hose for a pipe joint according to claim 1, wherein: The tube is formed by spirally winding a semi-molten soft synthetic resin strip at a constant pitch on a forming rotary shaft while polymerizing and fusing, thereby forming a tube wall having the same diameter over the entire length of the tube. A reinforcing core wire is spirally wound around the outer peripheral surface of the wall at a constant pitch, and the reinforcing core wire is covered with a semi-molten soft synthetic resin strip to form a reinforcing spiral ridge having a reinforcing core wire. A step of forming a soft synthetic resin hose of a fixed length, and following the step of forming the soft synthetic resin hose, both front and rear surfaces are formed into truncated conical surfaces on the forming rotary shaft. An abacus ball-shaped molding member is slidably covered on a molding rotary shaft, and the semi-molten soft synthetic resin band-shaped material is polymerized and fused at a constant pitch on the molding member, thereby forming a belly. A pair of front and rear parts that are joined together Forming the inclined flange portion.The molding process of the soft synthetic resin hose and the molding process of the soft synthetic resin inclined flange portion are alternately performed, while the front and rear inclined flange portions are sequentially connected. By cutting off the formed part and extracting the molded member from the cross section, a hose of a fixed length with inclined flanges provided at both ends is manufactured, and then the inclined flange is expanded further in the direction of standing up A method for manufacturing a synthetic resin hose for a pipe joint, wherein the hose is formed on an annular flange portion.

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