JP2009285657A - Pipe bender - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe bender with which bending work is easily performed at an allowed bending angle and a bend radius without depending on the skillfulness degree of a worker and without requiring a plurality of workers and which is excellent in movability and portability and has simple structure. <P>SOLUTION: This pipe bender 1 is provided with a holder 2 having rigidity by which the bender is mounted to a bending place of a pipe P and a belt 3 which is formed so as to be freely wound round the holder 2 and with which the pipe P and the holder 2 are integrally fixed. The holder 2 is formed into approximately semicircular trough shape in the cross section, also has a bend part 21 where is bent into a bend shape of not smaller than the allowable bend radius and with which the pipe P arranged in the bend part 21 is held so as not to be slid by providing the belt 3 on the outer surface of this bend part 21. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a pipe bender used for bending a pipe material capable of cold bending.

  In the fields of hot water and hot water supply piping and air conditioning piping, composite piping materials such as metal reinforced polyethylene pipes are frequently used as piping materials that have the advantages of both synthetic resin pipes and metal pipes and are excellent in corrosion resistance and heat resistance. . In recent years, a pipe material that does not require heat insulation work after piping is also used in which a heat insulating material such as crosslinked polyethylene foam is wound around the outer periphery of such a composite pipe material in advance on the outside of the pipe.

  These composite piping materials are generally processed into a pipe shape by so-called cold bending in a non-heated state at a construction site. When bending, a spring bender that is attached to the outside of the pipe and a bending jig (bender) called an inner bender that is inserted inside the pipe are deformed or seated by external forces during bending. Used by workers to prevent bending and flattening.

  Although the spring bender restricts the outer shape, flattening is prevented, but it cannot cope with bending of a piping material in which a heat insulating material such as a crosslinked polyethylene foam is wound around the outside of the pipe. In addition, there is a case where it is difficult to insert the inner bender up to a place where bending is necessary, and there is a problem that a work range in the length direction of the pipe is limited due to troublesome work in and out of the pipe. Moreover, although it inserts and uses for piping, when the joint of the inner surface water stop system is mounted | worn with the pipe end, an inner bender might not be able to be inserted in piping.

  In addition, in this type of vendor, because the operator manually bends the pipe to a predetermined angle, some bending angle is insufficient due to the repulsive force of the bent pipe, etc. Moreover, since it may bend beyond an allowable bending shape, it is difficult to control the bending angle or the bending radius depending on the skill level of the operator.

  If the bending angle or bending radius of the pipe is bent beyond the performance specific to the pipe material, residual stress is partially generated, and cracks are likely to occur in the bent part when using the pipe for a long time. Therefore, a jig that can be surely and easily bent by anyone within the allowable bending shape range is required.

Like these benders, in addition to those that are manually bent by an operator, bending apparatuses that perform bending by applying mechanical action to piping have also been proposed. For example, Patent Document 1 describes an apparatus that includes a bending regulating member that presses against a pipe and regulates the bending condition, and includes an auxiliary pad that holds the pipe and prevents the hip from being bent when the pipe is bent. Yes.
JP 2000-263142 A

  The device described in Patent Document 1 is a large-scale mechanical device as a whole, and has a weight, so that there is no convenience for bending a piping material while an operator supports it with one hand. For this reason, it is inconvenient because it has poor mobility and portability, such as a spring bender and an inner bender, which are appropriately used as necessary while performing water supply hot water supply piping and air conditioning piping at the construction site.

  The present invention has been made in view of the circumstances as described above, regardless of the skill level of the operator, the bending process of the composite piping material such as a metal reinforced polyethylene pipe and the piping material wrapped with a heat insulating material, Further, it is possible to provide a pipe bender having a simple structure excellent in mobility and portability, which can be easily performed with a predetermined allowable bending angle and bending radius without requiring a plurality of workers. It is.

  In order to achieve the above-described object, the present invention provides a pipe bender for bending a composite piping material having a laminated structure of a synthetic resin layer and a metal layer, the rigidity being attached to the bending portion of the composite piping material And a belt that is formed so as to be freely wound around the holder and that integrally fixes the composite piping material and the holder, and the holder is formed in a bowl shape having a substantially semicircular cross section. A bent portion that is bent into a bending shape that is equal to or greater than an allowable bending radius of the composite piping material, and the belt is provided on the outer surface of the bent portion so that the composite piping material disposed in the bent portion can be held. It is said.

  By being comprised in this way, it can be used without selecting the external shape and pipe diameter of the composite piping material which carries out a bending process, and can be easily processed into a desired bending angle and bending radius. In addition, since it has a simple structure, it can be carried anywhere, can be used by one worker without any limitation in working posture, and is highly convenient and extremely workable. It can be excellent.

  Further, in the pipe bender having the above-described configuration, the bent portion of the holder is provided with a notch groove corresponding to the belt width to hold the wound belt and prevent positional deviation. It is said.

  Thus, by having a notch groove, a composite piping material can be fixedly held by winding a belt firmly around a holder. Even if the composite piping material fits inside the saddle shape of the holder, the belt can be fastened to the composite piping material and the holder via this notch groove, so the pipe diameter can be selected. Can be bent.

  In the present invention, the belt is preferably a hook-and-loop fastener. Thereby, the fastening position of the belt is not limited, and the composite piping material can be easily fixed to the holder without being disengaged at the time of use, and can cope with various pipe diameters.

  Further, in the present invention, a heat insulating material is wound around an outer peripheral surface of the composite piping material, and the holder has a substantially semicircular cross section having a size corresponding to the outer diameter of the composite piping material including the heat insulating material. It preferably has a shape and can be used for a wider range of piping materials.

  According to the pipe bender of the present invention configured as described above, a bending process of a composite pipe material such as a metal reinforced polyethylene pipe or a pipe material wound with a heat insulating material can be performed regardless of the skill level of the operator. It can be easily performed with a predetermined allowable bending angle and bending radius without requiring a human operator. Pipe benders have a simple structure and are lightweight, so they have excellent mobility and portability, can be used quickly and easily at the construction site when necessary, and work posture is not limited. It can be made excellent.

  The best mode for carrying out the pipe bender according to the present invention will be described with reference to the drawings.

  1 to 3 show an example of a pipe bender according to the present invention, FIG. 1 (a) is a front view of the pipe bender, FIG. 1 (b) is a sectional view of the end of the pipe bender, and FIG. FIG. 3 is an explanatory view showing a state where bending is performed using a pipe bender.

  As shown in FIGS. 1 (a) and 1 (b), a pipe bender 1 includes a holder 2 attached to a bending portion of a pipe P, and a pipe P and a holder formed so as to be freely wound around the holder 2. And a belt 3 that integrally fixes the belt 2.

  Here, the pipe P which is the object of bending in the pipe bender 1 of the present invention has a metal composite tube of a thermoplastic resin, for example, a metal layer such as aluminum in an intermediate reinforcing layer, and an adhesive layer such as a modified polyethylene layer. A composite piping material such as a metal-reinforced polyethylene pipe in which a polyethylene layer is laminated on the outer layer is suitable. In addition, it is also possible to use the pipe bender 1 for a resin-coated stainless steel tube, a flexible metal tube such as a soft copper tube, or the like. Moreover, the pipe bender 1 can be used suitably also to what the heat insulating material of bridge | crosslinking polyethylene foam etc. is wound around the outer peripheral surface of such a pipe P previously. When these pipes P are bent during construction, they retain their bent shapes and are excellent in workability and rich in heat resistance and corrosion resistance.

  In the illustrated pipe bender 1, the holder 2 is formed in a bowl shape having a substantially semicircular cross section. The inner diameter φ of the substantially semicircular cross-sectional shape of the holder 2 is determined on the assumption of the pipe diameter of the pipe P to be bent, but in the case of water supply / hot water supply pipes and air conditioning pipes, it is about 40 mm to 80 mm. Preferably there is. That is, for such piping, pipes having a nominal diameter of about 10 mm to 50 mm are widely used as the pipe P, and the heat insulating material provided on the outer peripheral surface thereof has a thickness of about 10 mm to 30 mm. It becomes possible to cope with various pipe diameters of the pipe P including the heat insulating material.

  The holder 2 is provided with a bent portion 21 based on a prescribed allowable bending radius of the pipe P to be bent. That is, the bent portion 21 is formed by bending the holder 2 into a bent shape with a bending radius greater than the allowable bending radius of the pipe P. For example, it is considered that the bent portion 21 is frequently used when formed with bending radii of 150 mm, 200 mm, and 250 mm, and it is possible to cope with a bending process with a bending angle of 90 °. Here, the bending shape of the bent portion 21 being equal to or larger than the allowable bending radius of the pipe P means that the bending radius of the bending portion 21 is such that the pipe P satisfies a specified allowable bending radius. Includes a numerical value equal to or larger than the allowable bending radius.

  Such a holder 2 can be obtained by halving the synthetic resin tube and heat-treating the thermoplastic resin plate, bending it using a mold, and cooling it. For the synthetic resin pipe constituting the holder 2, it is preferable to use a pipe material made of a synthetic resin material such as hard polyvinyl chloride, polypropylene, polyethylene, polycarbonate, etc., which is light and has appropriate rigidity.

  Further, the belt 3 is provided at the bent portion 21 of the holder 2. The belt 3 may be any belt as long as it is flexible and can hold the pipe P disposed at the bent portion 21. Preferably, the fastening position is not limited, and it is configured from a hook-and-loop fastener that does not come off at the time of use and can correspond to various pipe diameters of the pipe P. As a result, the pipe P placed against the holder 2 can be easily fixed by being wound around the belt 3 together with the holder 2.

  The belt 3 is fixed to the holder 2 with a fastening tool 31 such as a bolt on the curved inner side (lower side in FIG. 1) of the bent portion 21. The bending portion 21 of the holder 2 is provided with an insertion hole for a fastening tool 31 for fixing the belt 3.

  A cutout groove 22 is formed on the outer surface of the bent portion 21 of the holder 2. As shown in FIG. 1, the notch groove 22 is formed by notching the opposite edge portions of the holder 2 in the bent portion 21 into a concave groove shape. Further, the notch groove 22 is not only provided at the edge of the holder 2 but may be formed in a shallow groove shape along the outer peripheral surface of the bent portion 21 of the holder 2. Regardless of the shape of the cutout groove 22 in any form, the groove width is formed corresponding to the width of the belt 3. Thereby, when the belt 3 is wound around the holder 2, the belt 3 is positioned and held by the notch groove 22, and the positional deviation of the belt 3 during bending can be prevented.

  As shown in FIG. 2, the pipe bender 1 configured as described above is used in a state in which the pipe P disposed inside the bowl shape of the holder 2 is fastened and held by the belt 3. At this time, the pipe P is fixed by the belt 3 by placing the bending portion at the bent portion 21. Since the holder 2 has a halved shape, the pipe P can be easily mounted, and the setting operation can be performed quickly.

  Next, the pipe portion located outside the holder 2 is pressed, and a force is applied by hand so as to follow the bent shape of the holder 2. As illustrated in FIG. 3, the operator may press the bent portion 21 of the holder 2 against one knee, hold the left and right pipes P of the holder 2 with both hands, and apply force. Thereby, the desired bending process can be performed easily and reliably without the bending part of the pipe P being displaced from the bent part 21 of the holder 2 or rising.

  Further, as shown in FIG. 3, the operator can not only bend the pipe P by the sitting posture but also can easily perform the bending by the standing posture. In the case of a standing posture, the holder 2 holding the pipe P is pressed against the abdomen so that the bent portion 21 is located in front of the body, and the right and left pipes P of the holder 2 are held with both hands to apply force. What should I do? Even in such a standing posture, the pipe P is not displaced from the bent portion 21 of the holder 2 or lifted, and the operation can be easily and reliably performed in an easy posture.

  Furthermore, since the pipe P is fastened to the holder 2 with the belt 3 wound around, the pipe P can be easily fixed and does not slip or slip during processing. Moreover, even when the pipe P has a small diameter, the belt 3 is fitted into the notch groove 22 at the edge of the holder 2, and the belt 3 can be short-circuited around the curved outer side of the holder 2, so that the holder can be wound. The pipe P does not shift within 2. Therefore, the pipe bender 1 can be a wide range of pipes P having a diameter that can be accommodated in the inner diameter φ of the holder 2 or a relatively large outer diameter pipe P wound with a heat insulating material. This makes it possible to process pipes P of any size without preparing various types of vendors.

  Further, the pipe bender 1 is lightweight, can be carried anywhere, and does not choose the posture to be used by the worker. Therefore, the pipe P can be bent quickly when necessary, and one worker is sufficient. It is possible to master it.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for easily bending a piping material used for water supply / hot water supply piping, air conditioning piping, and the like at a construction site.

An example of the pipe bender which concerns on this invention is shown, (a) is a front view, (b) is sectional drawing of a pipe bender edge part. It is a perspective view which shows the use condition of the pipe bender which concerns on this invention. It is explanatory drawing which shows a mode that it is bending using the pipe bender which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe bender 2 Holder 21 Bending part 22 Notch groove 3 Belt 31 Fastening tool P Pipe (composite piping material)

Claims (4)

A pipe bender for bending a composite piping material having a laminated structure of a synthetic resin layer and a metal layer,
A holder having rigidity to be attached to a bending portion of the composite piping material, and a belt formed so as to be freely wound around the holder and integrally fixing the composite piping material and the holder;
The holder is formed in a bowl shape having a substantially semicircular cross section, and has a bent portion that is bent in a bending shape that is equal to or larger than an allowable bending radius of the composite piping material, and the belt is provided on an outer surface of the bent portion. A pipe bender characterized by being able to hold the composite piping material arranged at the bent portion. The pipe bender according to claim 1,
A pipe bender characterized in that a notch groove corresponding to the belt width is provided in the bent portion of the holder to hold the wound belt and prevent displacement. The pipe bender according to claim 1 or 2,
A pipe bender characterized in that the belt is a hook-and-loop fastener and can accommodate various pipe diameters. In the pipe bender according to any one of claims 1 to 3,
A heat insulating material is wound around the outer peripheral surface of the composite piping material, and the holder has a substantially semicircular cross-sectional shape having a size corresponding to the outer diameter of the composite piping material including the heat insulating material. Pipe vendor.

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