JP2002323171A - Cutting method, jointing method, and jointing structure of flexible tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting method, a jointing method, and a jointing structure of a flexible tube which can easily cut at a construction site, and is capable of surely inserting, fitting, and sticking the end of the cut tube into the socket of a joint. SOLUTION: This cutting method of the flexible tube is provided with a process of applying adhesive B to a cutting part of the flexible tube A and its surroundings, a process of installing a heat-shrinkable tube C, with a diameter larger than the flexible tube around the flexible tube surrounding the cutting part of the flexible tube A and its surroundings, a process of heating and shrinking the flexible tube A with the heat-shrinkable tube C installed around it and throttling the cutting part of the flexible tube and its surroundings by a contraction tube D, and a process of cutting the cutting part of the flexible tube A along with the contraction tube D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting method for cutting a flexible tube having elasticity and flexibility, a joining method for joining a flexible tube cut by this cutting method to a joint, and a method for joining the same. The present invention relates to a joining structure for joining a flexible tube to a joint.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Utility Model Laid-Open No. 63-101
No. 384, a flexible tube is provided.
As shown in FIG. 4, this flexible tube is provided at one end in the width direction.
The inner wall surface of the open end has a fitting concave portion 50 provided with retaining portions 51, 51, and the other end has a tapered tip that is slidably fitted into and locked into the fitting concave portion 50. Fitting convex part 6
It is formed in a tubular shape by spirally winding a band-shaped synthetic resin profile 70 having zeros and fitting the fitting projections 60 into the fitting recesses 50 adjacent to each other in the wound state.

The flexible tube constructed as described above can be expanded or contracted or bent by sliding the fitting protrusion 60 in the fitting recess 50 in the axial direction of the tube. The pipe diameter can be freely changed by sliding the fitting projection 60 in the fitting recess 50 in the circumferential direction of the pipe. In addition, the flexible tube is generally put on the market with joints 80 attached to both ends thereof. The joint 80 is provided with a receiving port 81 having a diameter larger than that of the flexible pipe. The end of the pipe of the flexible pipe is inserted into the receiving port 81 to be fitted thereto. The contact surfaces of the flexible tube and the joint 80 are adhered with an adhesive and attached to the flexible tube.

[0004]

Heretofore, conventionally, a flexible tube equipped with a joint as described above has been used in a production plant.
It has been manufactured by forcibly inserting the end of the flexible tube into the socket of the joint and fitting the end of the flexible tube using a hydraulic cylinder or the like. For this reason, when flexible pipes of various dimensions are required at the construction site, these products must be made to order, and the productivity is poor and the products cannot be stocked. .

When a flexible pipe is cut to a required size at a construction site and a joint is attached to the flexible pipe, for example, when the flexible pipe is cut, The fitting state of the fitting concave portion 50 and the fitting convex portion 60 of the profile 70 in the wound state of the tube is released, and as shown in FIG. 5, due to the residual stress of the profile 70 caused by spirally winding, There was a problem that the profile 70 located at the pipe end was splashed outward and could not be easily inserted into the joint by an operator. This becomes more conspicuous as the rigidity of the profile 70 increases.

For this reason, a method of applying an adhesive to a cut portion of the flexible tube and fixing the cut portion, cutting the fixed cut portion, and inserting the cut portion into a receptacle can be considered. However, since the flexible tube has flexibility, the cut portion may be fixed in a curved state. In this state, when the cut portion of the flexible tube is cut, the cut surface of the profile is set vertically. In this state, when the end of the pipe, which is the cut portion, is inserted into the socket of the joint and fitted, the cut surfaces of these flexible tubes and the socket facing the cut surface are not cut. There is a problem that a gap is generated between the contact surfaces. Therefore, at present, the length is not adjusted at the construction site.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can be easily cut at a construction site, and the cut end of the pipe can be securely inserted into a socket of a joint. An object of the present invention is to provide a flexible tube cutting method, a flexible tube joining method, and a flexible tube joining structure that can be inserted and fitted and adhered.

[0008]

According to a first aspect of the present invention, a fitting recess is provided at one end in the width direction, and a fitting protrusion is slidably fitted into the fitting recess at the other end. In a wound state, a band-shaped synthetic resin profile is spirally wound, and in a wound state, a fitting convex portion is fitted to the fitting concave portion adjacent to each other to form a tubular shape. What is claimed is: 1. A method for cutting a flexible tube, comprising cutting a flexible tube into a heat-shrinkable tube having a diameter larger than that of the flexible tube so as to surround a cut portion of the flexible tube and its vicinity. The method includes the steps of heating and shrinking in a mounted state to bind the cut portion of the flexible tube and the vicinity thereof with a contracted shrink tube, and cutting the cut portion of the flexible tube together with the contracted shrink tube. It is characterized by the following. The invention according to claim 2 is the method for cutting a flexible tube according to claim 1, wherein an adhesive is applied to the cut portion and its vicinity before attaching the heat-shrinkable tube to the cut portion and its vicinity, The heat-shrinkable tube is heat-shrinked in an uncured state of the adhesive. According to a third aspect of the present invention, the cut end of the flexible tube cut by the cutting method according to the first or second aspect and tightened by the contracted shrink tube is fitted and bonded to the socket of the joint. It is characterized by doing. According to a fourth aspect of the present invention, a belt-shaped synthetic resin profile having a fitting concave portion at one end in the width direction and a fitting convex portion slidably fitted into the fitting concave portion at the other end is spirally wound. Wound in a shape,
In the wound state, a tube end of a flexible tube having elasticity and flexibility formed into a tubular shape by fitting fitting protrusions to the fitting recesses adjacent to each other forms a heat-shrinkable tube. The heat-shrinkable shrink tube is in a tight state, and the end of the tube is fitted and adhered to the joint port.

In the present invention, the material of the heat-shrinkable tube is not particularly limited as long as the flexible tube can be brought into a tightened state by heat shrinkage, and examples thereof include a hard polyvinyl chloride resin and a soft polyvinyl chloride resin. Examples include vinyl resins, polyolefin resins, and polyethylene terephthalate resins. Furthermore, when the spring force of the profile due to the residual stress is large, the holding power is insufficient with a commercially available heat-shrinkable tube. Can also be used. Incidentally, when used for a rigid polyvinyl chloride flexible tube having an inner diameter of 88 mm and an outer diameter of 108.5 mm, a hard polyvinyl chloride-based heat-shrinkable tube having a thickness of 2 mm is suitable.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for cutting a flexible tube, a method for joining a flexible tube, and a joint structure for a flexible tube according to the present invention will be described with reference to the drawings showing the embodiments. explain. In the embodiments described below, first, a method for cutting a flexible tube will be described, and thereafter, the flexible tube cut by the method for cutting a flexible tube will be joined to a socket of a joint. The method and the joining structure for joining the flexible pipe cut by the cutting method to the socket of the joint will be described.

Hereinafter, the method for cutting the flexible tube will be described.
An embodiment will be described in detail with reference to the drawings. In the following description, since the flexible tube has the same configuration as the above-described conventional flexible tube,
The description is omitted by attaching the same reference numerals, and only the part that is the gist of the present invention will be described. In the following description, the heat-shrinkable tube is heated, and the heat-shrinkable tube heat-shrinked by this heating is referred to as a shrinkable tube.

The method for cutting a flexible tube according to the present invention is shown in FIG.
(A) to (d), before applying the heat-shrinkable tube C to the cut portion of the flexible tube A and its vicinity, applying an adhesive B to the cut portion and its vicinity, Attaching a heat-shrinkable tube C having a larger diameter than the flexible tube A to the flexible tube A so as to surround the cut portion of the flexible tube A and the vicinity thereof; The method includes a step of heating and shrinking with the tube C attached to bind the cut portion of the flexible tube and the vicinity thereof with the shrink tube D, and a step of cutting the cut portion of the flexible tube A together with the shrink tube D. ing.

More specifically, as shown in FIG. 1 (a), this cutting method is first performed on a cutting portion of a flexible tube A having joints 80 attached to both ends thereof and an outer peripheral wall surface in the vicinity thereof. After applying the adhesive B, the heat-shrinkable tube C having heat shrinkability and having a cut line (not shown) printed on the outer surface is inserted from one end of the flexible tube A.

Next, as shown in FIG. 1B, a heat-shrinkable tube C inserted through one end of the flexible tube A is used.
Is attached so that the cutting line coincides with the cutting site of the flexible tube A at the cutting line and surrounds the cutting site and the vicinity thereof.

Then, as shown in FIG. 1 (c), in the uncured state of the adhesive B, the heat-shrinkable tube C attached to the cut portion of the flexible tube A and its vicinity is heated by a heater or the like. Tube D heated by heat
Thus, the cut portion of the flexible tube A and its vicinity are brought into a tight state. That is, the inner peripheral wall surface of the heat-shrinkable tube C is in close contact with the cut portion of the flexible tube A and the outer peripheral wall surface in the vicinity thereof when mounted on the flexible tube A. When C thermally contracts, its inner diameter decreases,
The contracted inner diameter of the contracted tube D binds the cut portion of the flexible tube A and its vicinity. Moreover, the cut portion of the flexible tube A and its vicinity are held in a straight tube shape by the contraction pressure.

Finally, as shown in FIG. 1D, the cutting portion of the flexible tube A tied by the contracted shrink tube D is cut along with the shrink tube D along the cutting line. As a result, as shown in FIG. 2, the cut portion of the cut flexible tube A is moved to the profile 70 located at the tube end of the flexible tube A by the binding of the contracted contraction tube D.
Can be fixed in a shape in which the fitting state of the fitting concave portion 50 and the fitting convex portion 60 is maintained, and it is possible to prevent the profile 70 from springing outward.

The flexible tube A and the flexible tube A
The adhesive B in the uncured state is interposed between the heat-shrinkable tubes C attached to the heat-shrinkable tubes C, whereby the gap between the heat-shrinkable shrinkable tube D and the flexible tube A can be filled. As a result, the contact surface between the shrinkable tube D and the flexible tube A can be kept watertight.

When the cut portion of the flexible tube A is curved, the cut portion of the flexible tube A is corrected to a non-curved state by the contraction of the contracted shrinkable tube D. The cutting portion of the profile 70 of the flexible tube A can be cut at a cutting plane perpendicular to the axis. Further, a cutting line is printed on the heat-shrinkable tube C in advance and the flexible tube B is attached to the flexible tube B, thereby cutting the flexible tube A along the cutting line. Can be improved. As described above, regarding the method for cutting a flexible tube of the present invention,
Although the case of cutting a flexible tube having fittings at both ends has been described, the cutting method of the present invention can also be used when cutting a flexible tube having no fitting.

Next, a description will be given of a method of joining the flexible tube cut by the above-mentioned cutting method to the socket of the joint and a joining structure of joining the flexible tube cut by the cutting method to the socket of the joint. I do. In the following description, a case will be described in which the flexible tube cut by the above-described cutting method is joined to the socket of the joint.

As shown in FIGS. 1 (e) and 1 (f), the method of joining a flexible tube according to the present invention employs a joint for receiving a cut end of a flexible tube A cut by the above-described cutting method. A step of inserting into the mouth and fitting and bonding.

First, as shown in FIG. 1 (e), an adhesive E is applied to a shrinkable tube D attached to a cut end of a flexible tube A cut by the above-described method for cutting a flexible tube. As shown in FIG. 1 (f), the cut end of the flexible tube A 'to which the adhesive E has been applied is fitted and bonded to the receiving port 91 of the new joint 90, and the new joint 90 is mounted. A flexible tube A ″ is obtained.

According to the above joining method and the joining structure shown in FIG. 3, the cut end of the flexible tube A 'is bound by the heat-shrinkable shrink tube D, and the profile 70 located at the end of the tube is bent. The fitting concave portion 50 and the fitting convex portion 60 are fixed in a shape maintaining the fitted state. Further, the receiving port 91 of the joint 90 is formed in a cylindrical shape having an inner diameter in consideration of the outer diameter of the flexible tube A ′ and the thickness of the shrinkable tube D, so that the receiving port 91 can be easily and smoothly inserted into the receiving port 91. The cut end of the flexible tube A 'is inserted and fitted and adhered to obtain the flexible tube A ".

As a result, the flexible pipe can be cut to a required size and a new joint can be mounted on the construction site. As a result, the flexible pipe with the joint mounted thereon can be produced at a production plant. In this case, there is an effect that it is not necessary to perform the order production. In the above-described method for joining flexible tubes, the adhesive E is applied to the heat-shrinkable shrinkable tube D binding the cut end of the flexible tube A. Alternatively, the adhesive E may be applied to the inner peripheral wall surface of the receiving port 91 of the joint 90, or the adhesive E may be applied to both of these portions.

The embodiments of the method for cutting the flexible tube, the method for joining the flexible tubes, and the joining structure for the flexible tubes according to the present invention have been described above. However, the present invention is not limited to the above, and can be variously changed in the scope of the claims. For example, a heat-shrinkable tube is previously attached to a flexible tube, and if necessary, the heat-shrinkable tube is positioned at a cutting site, and the heat-shrinkable tube is heated and shrunk to cut the flexible tube. It is also possible to adopt a configuration in which

In this case, if the inner diameter of the heat-shrinkable tube is formed into a cylindrical shape having an inner diameter larger than the outer diameter of the flexible tube and smaller than the outer diameter of the joint, the heat-shrinkable tube can be formed into a heat-shrinkable tube. The shrinkable tube does not accidentally come off the flexible tube. If the flexible tube to which the heat-shrinkable tube is previously mounted is cut as described above, in addition to the effect of the above-described method of cutting the flexible tube, the heat-shrinkable tube may be cut at the time of cutting the flexible tube. It is possible to save the trouble of attaching the tubes one by one.

The above-described method for cutting a flexible tube, the method for joining flexible tubes cut by this cutting method, and the structure for joining flexible tubes are not limited to the construction site.
It can also be used in production factories and the like. Furthermore, in the above-described embodiment, the joint structure of the flexible tube is a joint structure in which the flexible tube cut by the flexible tube cutting method of the present invention is joined to a joint. For example, besides the flexible tube cut by this cutting method,
It is also possible to adopt a configuration in which the tube end of the flexible tube having no joint is tightly bound by a heat-shrinkable tube obtained by heat-shrinking the heat-shrinkable tube and fitted and adhered to the socket of the joint.

[0027]

According to the first aspect of the present invention, there is provided a belt-shaped composite having a fitting concave portion at one end in the width direction and a fitting convex portion slidably fitted into the fitting concave portion at the other end. A resin-made profile is spirally wound, and in the wound state, a flexible tube having elasticity and flexibility formed into a tubular shape by fitting fitting protrusions to the fitting recesses adjacent to each other. A method of cutting a flexible tube to be cut, wherein a heat-shrinkable tube having a diameter larger than that of the flexible tube is attached to the flexible tube so as to surround a cut portion of the flexible tube and its vicinity. Since the method includes a step of binding the cut portion of the flexible tube and the vicinity thereof with a contracted shrink tube by heat shrinking, and a process of cutting the cut portion of the flexible tube together with the contracted shrink tube, Due to the binding of the shrink tube, the fitting recess of the profile located at the end of the flexible tube Can be fixed in a shape holding the fitted state of the convex portion, the profile can be prevented from bouncing on the outside. Further, when the cut portion of the flexible tube is curved, the cut portion of the flexible tube is corrected to a non-curved state by tightening the contracted shrink tube,
The cut surface of the flexible tube profile can be cut vertically.

According to a second aspect of the present invention, there is provided the flexible tube cutting method according to the first aspect, wherein an adhesive is applied to the cut portion and its vicinity before the heat-shrinkable tube is attached to the cut portion and its vicinity. Since the heat-shrinkable tube is heat-shrinked in an uncured state of the applied adhesive, in addition to the effect of the method for cutting a flexible tube according to claim 1, the flexible tube and the flexible tube may be used. Since the uncured adhesive is interposed between the attached heat-shrinkable tubes, the gap between the heat-shrinkable shrinkable tube and the flexible tube can be filled. The watertight state of the contact surface with the pipe can be maintained. Thereby, for example, there is an effect that it is possible to prevent water or the like from entering through these gaps.

The invention of claim 3 is the invention of claim 1 or claim 2.
In order to fit the cut end of the flexible tube cut by the cutting method described in the above and tightened by the contracted shrink tube into the socket of the joint, the cut end of the flexible tube is heated. The cut end of the flexible tube is fixed easily and smoothly to the receiving port by the binding of the contracted tube, which is fixed in a shape that maintains the fitted state of the fitting concave portion and the fitting convex portion of the profile located at the end of the tube. Can be fitted and bonded. As a result, the flexible pipe can be cut to a required size and a new joint can be installed at the construction site, and as a result, the flexible pipe with these joints installed can be manufactured to order at a production plant. There is an effect that there is no need to do this.

According to a fourth aspect of the present invention, there is provided a belt-shaped synthetic resin having a fitting recess at one end in the width direction and a fitting projection slidably fitted into the fitting recess at the other end. A tube end of a flexible tube having elasticity and flexibility formed in a tubular shape by spirally winding a profile and, in a wound state, fitting a fitting projection to the fitting recess adjacent to each other. The section is tightened by a heat-shrinkable heat-shrinkable tube and the end of the tube is fitted and adhered to the socket of the joint. Due to the binding of the heat-shrinkable shrink tube, the fitting position of the fitting concave portion and the fitting convex portion of the profile located at the end of the tube is fixed in a shape maintaining the fitted state, and the flexible tube is easily and smoothly inserted into the socket. The cut ends can be fitted and bonded. In addition, the cut surface of the profile located at the end of the flexible tube comes into contact with the inner peripheral bottom surface of the receiving port and is attached to the receiving port. However, since the cut surface of the profile is cut vertically, Since there is no gap in the contact surface and the flexible tube and the joint are bonded and fixed by the adhesive in this state, the water-tight state of these contact surfaces can be completely maintained. As a result, in a manner similar to the above-described method for joining flexible pipes, the flexible pipe can be cut to a required size and a new joint can be installed at the construction site. There is an effect that it is not necessary to produce a flexible tube to which a joint is attached in a production factory.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a cutting method and a joining method of a flexible tube according to the present invention.

FIG. 2 is a cross-sectional view showing a cut portion of the flexible tube cut by the cutting method according to the first embodiment.

FIG. 3 is a cross-sectional view showing a flexible tube and a joint of the flexible tube joining structure according to the present invention.

FIG. 4 is a view showing a conventional flexible tube.

FIG. 5 is a cross-sectional view showing a joint portion between a conventional flexible pipe and a joint.

[Explanation of symbols]

 A Flexible tube A 'Flexible tube with adhesive applied to shrink tube A "Flexible tube with new joint attached B Adhesive C Heat shrink tube D Shrink tube E Adhesive 50 Fitting recess 60 Fitting projection 70 Profile 80 Joint 81 Receptacle 90 Joint 91 Receptacle 92 Joint

Claims (4)

[Claims] 1. A belt-shaped synthetic resin profile having a fitting recess at one end in the width direction and a fitting projection slidably fitted into the fitting recess at the other end. A flexible tube that is wound and cut into a tubular flexible tube having elasticity and flexibility by fitting fitting protrusions to the fitting recesses adjacent to each other in the wound state. A cutting method, wherein a heat-shrinkable tube having a diameter larger than that of the flexible tube is heated and shrunk in a state of being attached to the flexible tube so as to surround the cut portion of the flexible tube and the vicinity thereof. Cutting a flexible tube with a step of binding a cut portion of the tube and its vicinity with a contracted shrink tube, and a step of cutting the cut portion of the flexible tube together with the contracted shrink tube. Method. 2. An adhesive is applied to the cut portion and its vicinity before the heat-shrinkable tube is attached to the cut portion and its vicinity, and the heat-shrinkable tube is thermally contracted in an uncured state of the adhesive. The method for cutting a flexible tube according to claim 1. 3. A flexible tube cut by a cutting method according to claim 1 or 2 and fitted with a contracted shrinkable tube, and a cut end of the flexible tube is fitted and bonded to a socket of a joint. A method for joining flexible tubes, characterized by the following. 4. A belt-shaped synthetic resin profile having a fitting concave portion at one end in the width direction and a fitting convex portion slidably fitted into the fitting concave portion at the other end. In the wound state, in the wound state, a tube end portion of a flexible tube having elasticity and flexibility formed by fitting fitting protrusions into the fitting recesses adjacent to each other has a thermal contraction. A flexible tube joined by heat-shrinking the flexible tube, wherein the tube end is fitted and adhered to a socket of a joint.