Electric fusion joint

Abstract

To provide an electric fusion joint that enables a pipe to be easily fixed without any possibility of loss of a component.SOLUTION: An electric fusion joint 100 comprises a joint body 10 into which a pipe P is inserted, a belt-like band part 41, a saw blade part 42 provided at one end of the band part 41, a clamp 40 comprising an engagement part 43 provided at the other end of the band part 41, and a coupling part 50 coupling the joint body 10 and clamp 40 together. The saw blade part 42 comprises a saw blade shape 42b and a first grip part 42a arranged on the other end side with respect to the saw blade shape 42b, and the engagement part 43 comprises a saw blade reception part 43b engaging the saw blade shape 42b and a second grip part 43a arranged on one end side with respect to the saw blade reception part 43b.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an electrofusion joint. [Background technology]

[0002] An electric fusion joint is known as a joint for connecting a pair of resin pipes made of thermoplastic resin. When connecting resin pipes with an electric fusion joint, it is necessary to hold the resin pipes in place during the fusion process so that they do not shift from one another. For example, a structure has been disclosed in which an engaging recess is provided in the joint body, and a clamp having an engaging protrusion at a position corresponding to the engaging protrusion is attached to the pipe with a bolt, and the pipe is inserted into the electric fusion joint. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-138964 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned clamp requires that the joint body and the clamp be manufactured separately and packaged together. This requires additional work to package separate parts together. In addition, the clamp may be lost during work at the construction site. Furthermore, the clamp is fixed to the pipe with a bolt. This has led to a demand for reducing the bolt tightening process, as well as the issue of bolts being lost at the work site.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide an electric fusion joint that eliminates the possibility of losing parts and allows pipes to be easily fixed. [Means for solving the problem]

[0006] In order to solve the above problems, the present invention proposes the following means. The electric fusion joint of the present invention comprises a joint body into which a tube is inserted, a clamp having a strip-shaped band portion, a saw blade portion provided at one end of the band portion, and an engaging portion provided at the other end of the band portion, and a connecting portion that connects the joint body and the clamp, wherein the saw blade portion has a saw blade shape and a first gripping portion arranged on the other end side of the saw blade shape, and the engaging portion has a saw blade receiving portion that engages with the saw blade shape, and a second gripping portion arranged on the one end side of the saw blade receiving portion.

[0007] According to this invention, the joint body and the clamp are connected by the connecting portion, which makes it possible to prevent the clamp from falling off at the construction site of the electric fusion joint, thereby eliminating the possibility of losing parts. Furthermore, the pipe inserted into the joint body is temporarily fixed by a clamp having a saw blade portion and an engagement portion. At this time, for example, a user can engage the saw blade shaped portion with the saw blade receiving portion by gripping the first grip portion and the second grip portion so as to sandwich the pipe between them. This makes the temporary fixing process easier than, for example, a clamp that temporarily fixes the pipe by using bolt fastening. Therefore, the pipe can be easily fixed.

[0008] The connecting portion may connect the joint body and the band portion of the clamp.

[0009] According to this invention, the connecting portion connects the joint body and the band portion of the clamp, which allows the saw blade portion and the engagement portion to move freely, making it relatively easy to hang a tool on the clamp.

[0010] The connecting portion may connect the joint body and the engaging portion of the clamp.

[0011] According to this invention, the connecting portion connects the joint body and the engaging portion of the clamp. In other words, the engaging portion is fixed to the joint body. Therefore, when aligning the saw blade with the engaging portion, the operation can be performed stably.

[0012] The fitting may also comprise a fitting body into which a pipe is inserted, a first clamp having a band-shaped first band portion and engaging portions provided on both ends of the first band portion, a second clamp having a band-shaped second band portion and a saw blade portion provided on both ends of the second band portion, and a connecting portion connecting the fitting body to the first clamp and the second clamp, wherein the saw blade portion has a saw blade shape and a first gripping portion located toward the center of the first band portion relative to the saw blade shape, and the engaging portion may comprise a saw blade receiving portion that engages with the saw blade shape, and a second gripping portion located toward the center of the second band portion relative to the saw blade receiving portion.

[0013] According to this invention, a first clamp is provided with engagement portions provided on both ends of a first band portion, and a second clamp is provided with saw blade portions provided on both ends of a second band portion. Furthermore, the joint body is connected to the first clamp and the second clamp by a connecting portion. In other words, two saw blade portions and two engaging portions are provided on the circumference of the end portion of the joint body. This makes it easier to find the saw blade portions and the engaging portions. This makes it easier to perform the clamp fixing operation.

[0014] The connecting portion may connect the joint body to the first band portion of the first clamp and to the second band portion of the second clamp.

[0015] According to this invention, the connecting portion connects the joint body to the first band portion of the first clamp and the second band portion of the second clamp. This allows the saw blade portion and the engagement portion to move freely. This makes it relatively easy to hang a tool on the clamp.

[0016] The connecting portion may connect the joint body to at least one of the engaging portion of the first clamp and the second band portion of the second clamp.

[0017] According to this invention, the connecting portion connects the joint body to at least one of the engaging portions of the first band portion of the first clamp and the second clamp. In other words, at least one of the engaging portions provided on both ends of the second band portion is fixed to the joint body. Therefore, when at least one of the saw blade portions is inserted into the engaging portion, the operation can be performed stably.

[0018] The fitting may also comprise a fitting body into which a pipe is inserted, a clamp having a strip-shaped band portion, a saw blade portion provided at one end of the band portion, and an engaging portion provided at the other end of the band portion, and a connecting portion connecting the fitting body and the clamp, wherein the saw blade portion has a saw blade shape and a first gripping portion arranged on the other end side of the saw blade shape, the engaging portion has a saw blade receiving portion that engages with the saw blade shape, and a second gripping portion arranged on the one end side of the saw blade receiving portion, and a plurality of the clamps may be provided in the circumferential direction of the fitting body.

[0019] According to this invention, a plurality of clamps each having a saw blade portion at one end and an engagement portion at the other end are provided in the circumferential direction of the joint body. In other words, the saw blade portions and engagement portions of adjacent clamps face each other in the circumferential direction of the joint body. This makes it possible to more uniformly clamp the pipe caused by the clamp fixing operation. Effect of the Invention

[0020] According to the present invention, it is possible to provide an electric fusion joint that can easily fasten pipes without the risk of losing parts. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a perspective view showing a construction state of an electric fusion joint according to an embodiment of the present invention. [Diagram 2]FIG. 2 is a plan view of the electric fusion joint shown in FIG. [Diagram 3] 3 is a side view of the electric fusion joint shown in FIG. 2 in a direction III. FIG. [Figure 4] 4 is a cross-sectional view taken along the line IV-IV shown in FIG. 2. [Diagram 5] FIG. 4 is an enlarged view of the V portion shown in FIG. [Figure 6] 6A and 6B are diagrams showing an example of installation of the clamp shown in FIG. 5, in which FIG. 6A shows a state before fixing, and FIG. 6B shows a state after fixing. [Figure 7] 2 is a first modified example of a clamp in the electric fusion joint shown in FIG. [Figure 8] FIG. 8 is a plan view of the electric fusion joint shown in FIG. [Figure 9] 9 is a side view of the electric fusion joint shown in FIG. 8 taken in direction IX. [Figure 10] 9 is a cross-sectional view taken along the line XX in FIG. 8. [Figure 11] 11 is an enlarged view of a portion XI shown in FIG. 10. [Figure 12] 12A and 12B are diagrams illustrating an example of the clamp shown in FIG. 11, in which (a) shows the clamp before fixing and (b) shows the clamp after fixing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] An electric fusion joint 100 according to one embodiment of the present invention will now be described with reference to the drawings. As shown in FIG. 1, the electric fusion joint 100 includes a joint body 10, a terminal portion 20, an indicator 30, a clamp 40, and a connecting portion 50. The joint body 10 is a cylindrical member. The pipe P is inserted into the joint body 10 through openings at both ends of the cylindrical body as sockets. The pipe P inserted from both ends of the joint body 10 is joined by fusion to the inside of the joint body 10 (described later).

[0023] The joint body 10 includes a heating wire (not shown) arranged in a coil shape between the outer and inner surfaces of the cylindrical joint body 10. The heating wire is a single conductor, and both ends of the heating wire are connected to the terminal portions 20. As shown in Fig. 1 and Fig. 2, a pair of terminals 20 are provided near both ends of the joint body 10. A power source (not shown) is connected to the terminals 20 in order to apply an electric current to the heating wire. This power source applies an electric current to the heating wire, heating the heating wire and melting the inner wall of the joint body 10 and the outer wall of the pipe P. This fuses the pipes P inserted into both ends of the joint body 10 to the joint body 10, thereby joining the pipes to each other. Examples of materials for the joint body 10 and the resin pipe include polybutene resin, high density polyethylene resin, medium density polyethylene resin, polypropylene resin, etc. (olefin-based resins).

[0024] The indicator 30 is used inside the joint body 10 to check whether the above-mentioned pipe P has been properly joined. For example, as shown in Fig. 1 and Fig. 2, the indicator 30 is preferably provided in a pair beside the pair of terminal parts 20. The indicator 30 is a protrusion formed on the outer wall of the joint body 10. Note that the protrusion is preferably protected by a cylindrical member or the like because it should not be visible from the outside before fusion is performed.

[0025] The welding quality is confirmed by the indicator 30 as follows. That is, the inner wall of the joint body 10 expands due to heat generated in the above-mentioned fusion process of the pipe P. Then, the indicator 30 is pushed out toward the outer wall side of the joint body 10. This makes the protrusion visible from the outside. That is, before the fusion process, the protrusion is embedded in the joint body 10 and cannot be seen from the outside. By visually checking the indicator 30 to see whether the protrusion is visible or not, it is confirmed that welding has been performed properly on the inner wall side of the joint body 10.

[0026] As shown in Figures 1 and 2, the clamps 40 are provided on both axial ends of the joint body 10. The clamps 40 temporarily hold the pipe P inserted into the joint body 10 prior to the above-mentioned fusion process. This serves to prevent the position of the pipe P from shifting during the fusion process. The clamps 40 include a band portion 41, a saw blade portion 42, and an engagement portion 43. The band portion 41 is a band-shaped member that comes into direct contact with the pipe P when the pipe P inserted into the joint body 10 is temporarily held. The band portion 41 is formed in an annular shape such that the inner peripheral side of the band-shaped member fits along the outer peripheral surface of the pipe P. A saw blade portion 42 is provided at one end of the band portion 41, and an engagement portion 43 is provided at the other end of the band portion 41. Furthermore, a protrusion (not shown) may be provided on the inner peripheral surface of the band portion 41 in the circumferential direction of the annular shape. This may allow the fastening force of the band portion 41 to be applied to the pipe P more efficiently, thereby improving the holding force of the band portion 41 for the pipe P.

[0027] The saw blade portion 42 is provided by being integrally molded on one end of the band portion 41. The saw blade portion 42 and the engagement portion 43 are fastened together by inserting the saw blade shape 42b into the engagement portion 43 (described later). At this time, the pipe P is fastened by the band portion 41, thereby temporarily holding the pipe P to the joint body 10. The saw blade portion 42 includes a first gripping portion 42a and a saw blade shape 42b. The first gripping portion 42a is a portion provided for contacting a tool T such as pliers when inserting the saw blade shape 42b into the engagement portion 43 (described later). The first gripping portion 42a is a surface at one end of the band portion 41 against which the tool T comes into contact when the saw blade shape 42b is inserted into the engagement portion 43. The first gripping portion 42a is formed by providing a shape that protrudes in the radial direction in the annular shape of the band portion 41 on the other end side of the band portion 41 relative to the saw blade shape 42b of the saw blade portion 42.

[0028] The sawtooth shape 42b is a portion that is inserted into the engagement portion 43. The sawtooth shape 42b alternately includes a plurality of portions that are inclined with respect to the radial direction in the annular shape of the band portion 41 (hereinafter, inclined portions) and portions that are approximately parallel to the radial direction (hereinafter, parallel portions). Note that, hereinafter, a set of one inclined portion and one parallel portion may be referred to as a step.

[0029] The engagement portion 43 is a socket into which the saw blade shape 42b described above is inserted, and is provided by being integrally molded on the other end of the band portion 41. That is, the engagement portion 43 has a shape that has at least a space therein for accommodating the saw blade shape 42b, and includes a second gripping portion 43a and a saw blade receiving portion 43b.

[0030] The second gripping portion 43a is a surface provided on one end side of the band portion relative to the saw blade receiving portion of the engagement portion. A tool T is brought into contact with the second gripping portion 43a when the saw blade shape 42b is inserted into the engagement portion 43. In other words, the first gripping portion 42a of the saw blade portion 42 and the second gripping portion 43a of the engagement portion 43 are provided at positions where they can be simultaneously gripped by the tool T. For this reason, it is preferable that the first gripping portion 42a and the second gripping portion 43a are provided parallel to each other. The saw blade receiving portion 43b is a step or a protrusion provided inside the engaging portion 43. As shown in FIG. 6, when the saw blade shape 42b of the saw blade portion 42 is inserted into the engaging portion 43, the saw blade receiving portion 43b is in contact with the saw blade shape 42b.

[0031] The connecting portion 50 is a portion that connects the clamp 40 and the joint body 10. This allows the joint body 10 and the clamp 40 to be integrated. The clamp 40 and the joint body 10 are preferably molded as one unit while being connected by the connecting portion 50. In this embodiment, the electrofusion joint 100 is preferably formed as one unit by injection molding. In this embodiment, as shown in Figs. 3 and 4, the connecting portion 50 is provided at a position corresponding to the terminal portion 20 at the end of the joint body 10. The connecting portion 50 particularly connects the engagement portion 43 of the clamp 40 and the joint body 10.

[0032] As shown in Fig. 6, the saw blade portion 42 and the engaging portion 43 are fastened together using a tool T as follows. That is, first, with the pipe P inserted into the joint body 10, the tip of the saw blade shape 42b of the saw blade portion 42 is aligned with the engaging portion 43 fixed by the connecting portion 50. Next, the tool T is brought into contact with the first gripping portion 42a and the second gripping portion 43a. Next, when a compressive force is applied by the tool T so that the first gripping portion 42a and the second gripping portion 43a approach each other, the saw blade shape 42b of the saw blade portion 42 enters the inside of the engaging portion 43 via the saw blade receiving portion 43b.

[0033] At this time, first, the inclined portion of the saw blade shape 42b comes into contact with the saw blade receiving portion 43b. As a result, the compressive force of the tool T acts so as to push up the saw blade receiving portion 43b via the inclined portion. As a result, the saw blade receiving portion 43b deforms to match the shape of the inclined portion, and the saw blade shape 42b enters the engagement portion 43 in a stepwise manner. When the saw blade shape has sufficiently entered the inside of the engaging portion 43, for example, as shown in Fig. 6, the engaging portion 43 and the first gripping portion 42a come into contact with each other. This completes the fastening of the saw blade 42 and the engaging portion 43. Alternatively, the fastening may be completed when the saw blade shape 42b has passed through the saw blade receiving portion 43b a predetermined number of stages.

[0034] After the saw blade portion 42 is fastened to the engagement portion 43, the parallel portion of the saw blade shape 42b comes into contact with the saw blade receiving portion 43b as shown in Fig. 6. At this time, even if a force is applied in a direction in which the saw blade shape 42b comes out of the engagement portion 43, the parallel portion comes into contact with the saw blade receiving portion 43b and serves as a barb. This prevents the saw blade shape 42b from coming out of the engagement portion 43, and maintains the fastened state between the saw blade portion 42 and the engagement portion 43.

[0035] The clamp 40 according to this embodiment has been described as having one annular band portion 41 provided at the end in the joint direction, as shown in FIG. Alternatively, a plurality of clamps 40 each having a band portion 41 formed in a semicircular shape may be provided at the end of the joint body 10. In other words, by adopting such a configuration, the saw blade portion 42 and the engagement portion 43 of adjacent clamps 40 may face each other.

[0036] Next, a double-sided clamp 60 shown in Figures 7 and 8 will be described as a modified example of the clamp 40 according to this embodiment. The double-sided clamp 60 includes a first clamp 61 and a second clamp 62. In the following description of the double-sided clamp 60, the same components as those in the clamp 40 are given the same reference numerals, and the description thereof will be omitted, with only the differences being described.

[0037] The first clamp 61 includes a first band portion 61b and an engagement portion 43. The first band portion 61b is a component similar to the band portion 41 of the clamp 40 described above, but differs in that it has engagement portions 43 at both ends. In the engagement portion 43 of the first clamp 61, the second gripping portions 43a are provided closer to the center of the first band portion 61b than the saw blade receiving portions 43b.

[0038] The second clamp 62 includes a second band portion 62b and a saw blade portion . The second band portion 62b is a component similar to the band portion 41 of the clamp 40 described above, but differs in that it has saw blade portions 42 at both ends. In the saw blade portion 42 of the second clamp 62, the first gripping portions 42a are provided closer to the center of the first band portion 61b than the saw blade shapes 42b.

[0039] 9 and 10, the first clamp 61 has the joint body 10 and a first band portion 61b connected by the connecting portion 50. Furthermore, the second clamp 62 has the joint body 10 and a second band portion 62b connected by the connecting portion 50. With this configuration, the engagement portions 43 of the first clamp 61 at both ends of the first band portion 61b and the saw blade portions 42 of the second clamp 62 at both ends of the second band portion 62b face each other in the two-sided clamps 60. As a result, the engagement portions 43 of the first clamp 61 and the saw blade portions 42 of the second clamp 62 are fastened to the end portions of the joint body 10 at two points, as shown in FIG.

[0040] In addition, while the clamp 40 is connected between the joint body 10 and the engagement portion 43 by the connecting portion 50, the first clamp 61 and the second clamp 62 of the bilateral clamp 60 are connected between the first band portion 61b and the second band and the joint body 10, respectively, by the connecting portion 50. That is, whereas in this embodiment the engaging portion 43 of the clamp 40 is directly fixed to the joint body 10 and does not move relative to the joint body 10, the engaging portion 43 of the first clamp 61 moves relative to the joint body 10, similar to the saw blade portion 42. For this reason, the workability relating to fastening the saw blade portion 42 and the engaging portion 43 in the clamp 40 and the two-sided clamp 60 differs in the ease of aligning the saw blade portion 42 with the engaging portion 43. Also, since the two-sided clamp 60 has two fastening portions between the saw blade portion 42 and the engaging portion 43 at one end of the joint body 10, it differs in visibility during work.

[0041] At the construction site, it is possible to arbitrarily select whether to use the clamp 40 or the double clamp 60, taking into consideration the above differences. As shown in FIG. 12, even when the double-sided clamp 60 is used, the fastening operation of the saw blade portion 42 and the engagement portion 43 by the tool T can be performed in the same manner as when the clamp 40 is used.

[0042] As described above, according to the electric fusion joint 100 of this embodiment, the joint body 10 and the clamp 40 are connected by the connecting portion 50. This makes it possible to prevent the clamp 40 from falling off at the construction site of the electric fusion joint 100. This also makes it possible to eliminate the possibility of losing parts. Furthermore, the pipe P inserted into the joint body 10 is temporarily fixed by a clamp 40 having a saw blade portion 42 and an engagement portion 43. At this time, for example, a user can engage the saw blade shaped portion with the saw blade receiving portion 43b by gripping the first gripping portion 42a and the second gripping portion 43a so as to sandwich them between each other. This makes the temporary fixing process easier than, for example, the clamp 40 which temporarily fixes the pipe P by using bolt fastening. Therefore, the pipe P can be fixed easily.

[0043] Furthermore, the connecting portion 50 connects the joint body 10 and the band portion 41 of the clamp 40. This allows the saw blade portion 42 and the engagement portion 43 to move freely. This makes it relatively easy to hang the tool T on the clamp 40.

[0044] Furthermore, the connecting portion 50 connects the joint body 10 and the engaging portion 43 of the clamp 40. That is, the engaging portion 43 is fixed to the joint body 10. Therefore, when aligning the saw blade portion 42 with the engaging portion 43, the operation can be performed stably.

[0045] The joint body 10 also includes a first clamp 61 having engagement portions 43 provided at both ends of a first band portion 61b, and a second clamp 62 having saw blade portions 42 provided at both ends of a second band portion 62b. The joint body 10 is further connected to the first clamp 61 and the second clamp 62 by a connecting portion 50. In other words, two saw blade portions 42 and two engaging portions 43 are provided on the circumference of the end portion of the joint body 10. This makes it easier to find the saw blade portions 42 and the engaging portions 43. This makes it easier to fix the clamp 40.

[0046] Furthermore, the connecting portion 50 connects the joint body 10 to the first band portion 61b of the first clamp 61 and the second band portion 62b of the second clamp 62. This allows the saw blade portion 42 and the engagement portion 43 to move freely. This makes it relatively easy to hang the tool T on the clamp 40.

[0047] Furthermore, the connecting portion 50 connects the joint body 10 to the first band portion 61b of the first clamp 61 and at least one of the engaging portions 43 of the second clamp 62. That is, at least one of the engaging portions 43 provided on both ends of the second band portion 62b is fixed to the joint body 10. Therefore, when at least one of the saw blade portions 42 is inserted into the engaging portion 43, the operation can be performed stably.

[0048] Further, a plurality of clamps 40 each having a saw blade portion 42 on one end and an engagement portion 43 on the other end are provided in the circumferential direction of the joint body 10. That is, the saw blade portions 42 and the engagement portions 43 of adjacent clamps 40 face each other in the circumferential direction of the joint body 10. This makes it possible to make the clamping force on the pipe P generated by the fixing operation of the clamps 40 more uniform.

[0049] The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in an electrofusion joint 100 having a clamp 40 , the joint body 10 and the band portion 41 may be connected by a connecting portion 50 . In the electrofusion joint 100 having the double-sided clamps 60 , the joint body 10 and the engaging portion 43 of the first clamp 61 may be connected by a connecting portion 50 . In addition, in the double-sided clamp 60, the first clamp 61 may be provided with the saw blade portion 42, and the second clamp 62 may be provided with the engagement portion 43.

[0050] In addition, within the scope of the invention, the components in the above-described embodiments may be replaced with well-known components, and the above-described modified examples may be combined as appropriate. [Explanation of symbols]

[0051] 10. Fitting body 40 Clamp 41 Band 42 Saw blade part 42a 1st grip part 42b Saw blade shape 43 Engagement part 43a Second grip part 50 Connection part 61 First clamp 61b 1st Band 62 Second Clamp 62b 2nd Band 100 Electric fusion joint P tube T-tool

Claims

1. a fitting body into which a pipe is inserted; A clamp including a band portion, a saw blade portion provided at one end of the band portion, and an engagement portion provided at the other end of the band portion; a connecting portion that connects the joint body and the clamp; Equipped with The saw blade portion has a saw blade shape and a first grip portion disposed on the other end side of the saw blade shape, The engaging portion includes a saw blade receiving portion that engages with the saw blade shape, and a second gripping portion that is disposed closer to the one end side than the saw blade receiving portion, A protrusion is provided on an inner peripheral surface of the band portion in a circumferential direction of the joint body, The connecting portion is larger in a radial direction of the joint body than the clamp and protrudes outward in the radial direction than the clamp. Electric fusion joint.

2. The connecting portion connects the joint body and the band portion of the clamp. The electric fusion joint according to claim 1.

3. The connecting portion connects the joint body and the engaging portion of the clamp. The electric fusion joint according to claim 1.

4. a fitting body into which a pipe is inserted; A clamp including a band portion, a saw blade portion provided at one end of the band portion, and an engagement portion provided at the other end of the band portion; a connecting portion that connects the joint body and the clamp; Equipped with The saw blade portion has a saw blade shape and a first grip portion disposed on the other end side of the saw blade shape, The engaging portion includes a saw blade receiving portion that engages with the saw blade shape, and a second gripping portion that is disposed closer to the one end side than the saw blade receiving portion, The clamp is provided in a plurality of parts in a circumferential direction of the joint body, A protrusion is provided on an inner peripheral surface of the band portion in a circumferential direction of the joint body, The connecting portion is larger in a radial direction of the joint body than the clamp and protrudes outward in the radial direction. Electric fusion joint.

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