Stopper for synthetic resin pipe

Abstract

To provide a coming-off preventing tool for a synthetic resin pipe capable of simplifying the connecting work of the synthetic resin pipes and surely maintaining the connected state.SOLUTION: The synthetic resin pipe stopper 200 is used for maintaining a state where a synthetic resin pipe 100 having a first end formed as an insertion end 110, a second end formed as a socket 120, and one or a plurality of recesses 140 formed on an outer peripheral surface at least on the side of the insertion end 110 is connected in an extension direction. The pipe joint includes a holding portion 210 that holds the socket 120 in a thickness direction at an opening end portion position 122 of the socket 120, a pressing body 220 that enters the holding portion 210 in the thickness direction from the outside of the socket 120 and presses the socket 120 in the thickness direction together with the holding portion 210, a tongue piece body 230 that enters a recessed portion 140 of the synthetic resin pipe 100 inserted into the socket, and a tongue piece fixing body 240 that fixes the tongue piece body 230 that has entered the recessed portion 140 to the holding portion 210.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a retainer for synthetic resin pipes, and more particularly to a retainer for synthetic resin pipes that can reliably maintain the connection state between synthetic resin pipes. [Background technology]

[0002] When connecting synthetic resin pipes together in the extension direction, a connecting structure using a joint as disclosed in Patent Document 1 (Japanese Patent Laid-Open Publication No. 2000-282556) has been proposed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-282556 A (claims 1 and 2, paragraph 0014 of the specification, figures 1 to 4, etc.) Summary of the Invention [Problem to be solved by the invention]

[0004] The joint disclosed in Patent Document 1 is separate from the synthetic resin pipe, and employs a configuration in which synthetic resin pipes are inserted from both sides of the joint and fastened with a fastening band that encircles the outer periphery of the joint. This poses a problem in that the process of connecting synthetic resin pipes together is cumbersome. [Means for solving the problem]

[0005] SUMMARY OF THE INVENTION An object of the present invention is to provide a stopper for synthetic resin pipes that can simplify the process of connecting synthetic resin pipes and reliably maintain the connected state of the synthetic resin pipes.

[0006] As a result of intensive research conducted by the present inventors to solve the above problems, the present invention has arrived at the following configuration: That is, the present invention is a synthetic resin pipe stopper for maintaining a synthetic resin pipe connected in the extension direction, the synthetic resin pipe having a first end in the extension direction formed as an insertion end and a second end formed as a socket into which the insertion end can be inserted, and having one or more recesses formed on the outer circumferential surface at least on the side of the insertion end, the synthetic resin pipe stopper comprising: a clamping portion that clamps the socket in the wall thickness direction at the open end of the socket, a pressing body that advances into the clamping portion from outside the socket in the wall thickness direction of the socket and presses the socket in the wall thickness direction together with the clamping portion, a tongue portion that advances into the recess of the synthetic resin pipe inserted into the socket, and a tongue portion fixing portion that fixes the tongue portion that has advanced into the recess to the clamping portion.

[0007] This simplifies the process of connecting synthetic resin pipes together, and makes it possible to reliably maintain the connected state of the synthetic resin pipes together.

[0008] It is also preferable that the tongue body be movable in the depth direction of the recess of the synthetic resin pipe inserted into the receiving port, and it is more preferable that the tongue body has a long hole extending along the length of the tongue body, and that the tongue body fixing body enters the long hole so that the tongue body can move along the long hole.

[0009] This makes it possible to adjust the amount of insertion of the tongue body into the recess.

[0010] It is also preferable that the clamping portion has an uneven portion formed on a surface facing the inner peripheral surface of the receiving port, which is pressed by the pressing body.

[0011] This allows the synthetic resin pipe stopper to be firmly attached to the socket.

[0012] Preferably, the tongue piece has ribs formed on both edge portions extending in the direction of insertion into the recess.

[0013] This makes it possible to improve the strength (rigidity) of the tongue body, and to prevent the tongue body from being deformed.

[0014] It is also preferable that the inner surface of each of the ribs is positioned outside the widthwise side surface of the clamping portion, and serves as a guide when the tongue body is moved.

[0015] This makes it easier to insert the tongue piece in a direction perpendicular to the opening surface of the recess, improving workability during the connecting work and enhancing the anti-detachment effect after connection. [Effects of the Invention]

[0016] By adopting the configuration of the synthetic resin pipe retainer according to the present invention, the work of connecting synthetic resin pipes can be simplified and the connection state of the synthetic resin pipes can be reliably maintained. In addition, because the synthetic resin pipe retainer is detachable from the receiving port, it can be removed after installation, allowing the synthetic resin pipe retainer to be reused, minimizing the increase in costs involved in installing synthetic resin pipes. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 2 is a front view of synthetic resin pipes to be connected in this embodiment. [Figure 2] 1 is an exploded perspective view of a stopper for a synthetic resin pipe according to an embodiment of the present invention. FIG. [Figure 3] 1 is a perspective view of a stopper for a synthetic resin pipe according to an embodiment of the present invention. FIG. [Figure 4] 1 is a perspective view of a stopper for a synthetic resin pipe according to an embodiment of the present invention. FIG. [Figure 5] 1 is a view of the synthetic resin pipe stopper of this embodiment viewed from the receiving side. FIG. [Figure 6] 1 is a view of the synthetic resin pipe retainer of this embodiment viewed from the radially outer side of the synthetic resin pipe. FIG. [Figure 7] 7 is a front explanatory view showing a state in which the synthetic resin pipes shown in FIG. 6 are connected in the extension direction. FIG. [Figure 8] FIG. 8 is an enlarged explanatory view of part VIII in FIG. 7. [Figure 9] This shows (A) the situation of a test to prevent the plastic pipes from coming loose in a connected state, and (B) an enlarged perspective view of the connected part. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described in detail below with reference to the drawings. As shown in Figure 1, a synthetic resin pipe 100 in this embodiment has a first end in the extension direction formed as an insertion end 110, and a second end in the extension direction formed as a socket 120 into which the insertion end 110 can be inserted. Such a synthetic resin pipe 100 is preferably made of polyethylene, but the type of synthetic resin is not particularly limited.

[0019] In this embodiment, the outer peripheral surface of the synthetic resin pipe 100 is provided with multiple convex portions 130 spaced at predetermined intervals throughout its entire length. Multiple concave portions 140 are formed on the outer peripheral surface of the synthetic resin pipe 100 at predetermined intervals between adjacent convex portions 130 in the length direction. A seal member 150 is provided on the convex portion 130 at the leading end of the insertion end 110. The outer diameter of the seal member 150 is larger than that of the convex portion 130. When dry, the seal member 150 has a plastic-like appearance, which has a low coefficient of friction and allows for easy insertion into the socket 120. When the seal member 150 absorbs water, it expands to form a watertight seal between the seal member 150 and the inner peripheral surface 124 of the socket 120.

[0020] In this embodiment, the insertion end 110 is formed to align with the position of the recess 140 of the projections 130 and recesses 140 formed on the outer peripheral surface. The opening surface of the insertion end 110 opens in a direction perpendicular to the center line in the extension direction of the synthetic resin pipe 100. The socket 120 is formed with a tapered shape on the side of the open end position 122 that expands in diameter over a required length range in the extension direction of the synthetic resin pipe 100, making it easier to insert the insertion end 110. It is also preferable that the open end position 122 of the socket 120 coincide with the position of the recess 140 of the synthetic resin pipe 100 when the insertion end 110 is inserted into the socket 120 by a predetermined insertion length (when the seal member 150 is positioned at a predetermined position in the socket 120).

[0021] The diameter of inner circumferential surface 124 of socket 120 is preferably the same as the outer diameter of seal member 150 formed on insertion end 110. Note that if seal member 150 that expands upon absorbing water is used, and seal member 150 is dry, the diameter of inner circumferential surface 124 may be slightly larger than the outer diameter of seal member 150. Also, if seal member 150 is elastically deformed when insertion end 110 is inserted into inner circumferential surface 124 of socket 120, the diameter of inner circumferential surface 124 may be slightly smaller than the outer diameter of seal member 150. The key is to ensure that water does not leak from the connection when water is passed through the connection after connecting synthetic resin pipes 100 according to the characteristics of seal member 150.

[0022] The following describes a synthetic resin pipe retainer 200 (hereinafter simply referred to as retainer 200) used to maintain the connected state when multiple synthetic resin pipes 100 formed as described above are connected in the extension direction. As shown in Figures 2 to 6, retainer 200 in this embodiment includes a clamping portion 210, a pressing body 220, a tongue body 230, and a tongue fixing body 240.

[0023] The clamping portion 210 in this embodiment is formed in a U-shape that clamps the socket 120 in the thickness direction of the component at the open end position 122 of the socket 120 of the synthetic resin pipe 100. Both end edges on the inside of the U-shape are formed with bent portions 212, which are bent at a right angle within a required range relative to the thickness direction of the component. An upper surface 214 of the bent portion 212, which faces the inner peripheral surface 124 of the socket 120, is formed with an uneven portion 216 that is shaped like a mountain in side view, although the specific shape of the uneven portion 216 is not particularly limited. Furthermore, a first surface 211, which is located on the outer surface of the socket 120 when the clamping portion 210 is attached to the socket 120, is provided with a first screw hole 211A that penetrates the first surface 211 in the thickness direction of the component. A second surface 213 of the clamping portion 210 is bent in a direction substantially perpendicular to the first surface 211, and a second screw hole 213A is drilled through the second surface 213 in the member thickness direction.

[0024] An example of the pressing body 220 in this embodiment is a pressing bolt that is screwed into the first screw hole 211A and has a tip portion formed into a flat or hemispherical surface. The pressing body 220 is not limited to a pressing bolt, and other known configurations may also be adopted.

[0025] In this embodiment, the tongue piece 230 has a tongue-like shape, with a semicircular portion 231 formed as a portion to be inserted into the recess 140 and a rectangular portion fixed to the clamping portion 210. Ribs 232 bent in a direction perpendicular to the thickness direction of the member are formed on both widthwise end edges of the rectangular fixed portion of the tongue piece 230 extending in the insertion direction (insertion direction). The inner width between the ribs 232 is the same as the width of the clamping portion 210. This allows the tongue piece 230 to slide relative to the clamping portion 210 along the radial direction of the socket 120 (synthetic resin pipe 100) (the direction perpendicular to the opening of the recess 140), using the ribs 232 located on the outer sides of the widthwise side of the clamping portion 210 as guides. A through-hole 234 is formed in the tongue piece 230, penetrating the tongue piece 230 in the thickness direction of the member, aligned with the position of the second screw hole 213A of the clamping portion 210. The through-hole 234 is formed as an elongated hole that is long in the direction in which the tongue piece body 230 enters, and a bolt 246 (described later) enters to fix the tongue piece body 230 to the clamping portion 210 .

[0026] In this embodiment, the tongue piece fixing body 240 has a flat washer 242, a spring washer 244, and a bolt 246, but the tongue piece fixing body 240 is not limited to this form and other known configurations can be adopted.

[0027] Next, a method for attaching the stopper 200 to the synthetic resin pipe 100 in this embodiment will be described. The worker inserts the insertion end 110 of the upstream synthetic resin pipe 100 into the socket 120 of the downstream synthetic resin pipe 100 to a predetermined position. Note that a predetermined insertion position indicator (not shown) that indicates the predetermined insertion position into the socket 120 may be provided in the recess 140 on the side of the insertion end 110 of the synthetic resin pipe 100. If a predetermined insertion position indicator is provided, the worker simply inserts the insertion end 110 of the upstream synthetic resin pipe 100 into the socket 120 of the downstream synthetic resin pipe 100 until the position of the predetermined insertion position indicator is aligned with the open end position 122 of the socket 120.

[0028] Next, the worker clamps socket 120 in the thickness direction of the component at open end position 122 of socket 120 of downstream synthetic resin pipe 100 with clamping unit 210, and then screws pressing body 220 into first screw hole 211A. By adjusting the amount of threading of pressing body 220 into first screw hole 211A, the worker presses socket 120 with the tip of pressing body 220 against uneven portion 216 of clamping unit 210. This makes it possible to fix clamping unit 210 to socket 120 in a state in which socket 120 is clamped in the thickness direction of the component by pressing body 220 and uneven portion 216 formed on the surface opposing inner circumferential surface 124 of socket 120 that is pressed by pressing body 220. In this embodiment, the clamping portions 210 are attached at four locations evenly spaced around the circumferential direction of the opening end position 122 of the receiving port 120, but the number of clamping portions 210 (stopper 200) attached to the receiving port 120 is not particularly limited.

[0029] Next, the worker aligns the through-hole 234 of the tongue body 230 with the position of the second screw hole 213A on the second surface 213 of the clamping portion 210. In this state, the inner surfaces of each rib 232 of the tongue body 230 clamp the second surface 213 of the clamping portion 210, and the ribs 232 serve as guides (also functioning as anti-rotation devices) when adjusting the attachment position of the tongue body 230 relative to the clamping portion 210. The worker adjusts the amount of insertion so that the semicircular portion 231 of the tongue body 230 is located within the depth range of the recess 140 on the outer circumferential surface of the insertion end 110 of the upstream synthetic resin pipe 100. After adjusting the amount of penetration of the semicircular portion 231 into the recess 140, the worker screws the tongue piece fixing body 240 into the second screw hole 213A to fix the tongue piece body 230 to the clamping portion 210, thereby completing the installation of the stopper 200 to the downstream synthetic resin pipe 100.

[0030] 8, the semicircular portion 231 of the tongue piece 230 is inserted into the recess 140 to a depth position where it contacts the inclined surface 132 of the protrusion 130, but the tip of the semicircular portion 231 may be in contact with the inner bottom surface of the recess 140. By performing the above procedure for all four stoppers 200 around the circumferential direction of the socket 120 of the downstream synthetic resin pipe 100, the worker can more reliably maintain the connection between the downstream synthetic resin pipe 100 and the upstream synthetic resin pipe 100.

[0031] The worker simply repeats the above procedure for each of the connected portions of the synthetic resin pipes 100. As shown in FIG. 9, the connected synthetic resin pipes 100 can maintain their connection even when one of the connected synthetic resin pipes 100 is lifted. This allows multiple connected synthetic resin pipes 100 to be transported within the installation site, improving the efficiency of installation work. Furthermore, as is clear from FIG. 9(B), even when the connected portion of the synthetic resin pipes 100 is bent, the ribs 232 prevent the tongue piece 230 from rotating around the bolt 246 relative to the clamping portion 210, maintaining the initial attachment state to the clamping portion 210. This maintains the semicircular portion 231 inserted in the depth direction of the recess 140 (the radial direction of the synthetic resin pipe 100), ensuring reliable maintenance of the connected state of the synthetic resin pipes 100.

[0032] The retaining device 200 for a synthetic resin pipe 100 according to the present invention has been described above based on an embodiment, but the present invention is not limited to the above-described embodiment. For example, the synthetic resin pipe 100 in the above embodiment has a configuration in which multiple protrusions 130 are arranged at required intervals along the entire outer surface and multiple recesses 140 are arranged along the entire length of the synthetic resin pipe 100, but the present invention is not limited to this configuration. It is sufficient that at least one recess 140 into which the tongue piece 230 is inserted is arranged along the outer surface of the synthetic resin pipe 100 within a required length range, including the open end position 122 of the socket 120. Alternatively, the outer surface of the synthetic resin pipe 100 may have at least one protrusion 130 arranged at multiple locations, including the open end position 122 of the socket 120.

[0033] Furthermore, in the above embodiment, a configuration in which a plurality of ring-shaped protrusions 130 are arranged in the extension direction on the outer peripheral surface of the synthetic resin pipe 100 is exemplified, but the present invention is not limited to this configuration. The protrusions 130 may be arranged in a spiral shape on the outer peripheral surface of the synthetic resin pipe 100. In this case, it is preferable that the open end position 122 of the socket 120 is also formed in a shape that matches the spiral shape of the protrusions 130.

[0034] Furthermore, in the above embodiment, an example has been given in which sealing member 150 is disposed at insertion end 110, but the present invention is not limited to this. Sealing member 150 can also be disposed at reception port 120. When disposing sealing member 150 at reception port 120, a form can be adopted in which sealing member 150 is disposed around the inner circumferential surface 124 of reception port 120 or along the portion that abuts against the tip end of insertion end 110 in the insertion direction (opening edge of insertion end 110).

[0035] In the above embodiment, an example is shown in which the bending portion 212 is formed in the clamping portion 210 and the uneven portion 216 is arranged in the bending portion 212, but the present invention is not limited to this. A configuration in which a rib body (not shown) is arranged on the surface facing the socket 120 instead of the bending portion 212 can also be adopted. The formation of the bending portion 212 can also be omitted. A configuration in which a friction member (anti-slip member) is arranged on the surface of the uneven portion 216 or the rib body (not shown) that abuts against the socket 120 can also be adopted. Furthermore, regardless of the presence or absence of the bending portion 212, a configuration in which the uneven portion 216 is omitted can also be adopted.

[0036] Furthermore, in this embodiment, the tongue piece body 230 is exemplified as having a shape in which the portion inserted into the recess 140 is formed in a semicircular arc shape, but this is not limited to this shape. There are no particular limitations on the specific shape as long as it can enter the recess 140. Furthermore, the provision of the rib 232 on the tongue piece body 230 may be omitted.

[0037] Furthermore, it is also possible to adopt a form in which the modified examples described in the above embodiments are appropriately combined. [Explanation of symbols]

[0038] 100: Synthetic resin pipe 110: Insertion end, 120: Socket, 122: Opening end position, 124: Inner peripheral surface, 130: convex portion, 132: inclined surface, 140: concave portion, 150: sealing member 200: Stopper for synthetic resin pipes (stopper 200) 210: Holding part, 211: First surface, 211A: First screw hole, 212: Bent part, 213: Second surface, 213A: Second screw hole, 214: Top surface, 216: Uneven part, 220: pressing body, 230: tongue body, 231: semicircular part, 232: rib, 234: Through hole, 240: Tongue piece fixing body, 242: Flat washer, 244: Spring washer, 246: Bolt

Claims

1. A synthetic resin pipe retainer for maintaining a synthetic resin pipe connected in the extension direction, the synthetic resin pipe having a first end in an extension direction formed as an insertion end and a second end formed as a receptacle into which the insertion end can be inserted, the synthetic resin pipe having one or more recesses formed on its outer peripheral surface at least on the side of the insertion end, a clamping portion that clamps the socket in a thickness direction at an open end position of the socket; a pressing body that enters the clamping portion from outside the socket in a thickness direction of the socket and presses the socket in the thickness direction together with the clamping portion; a tongue piece that enters the recess of the synthetic resin pipe inserted into the socket; a tongue fixing member for fixing the tongue member inserted into the recess to the clamping portion.

2. 2. The synthetic resin pipe stopper according to claim 1, wherein the tongue piece is movable in the depth direction of the recess of the synthetic resin pipe inserted into the socket.

3. 3. A synthetic resin pipe stopper as claimed in claim 2, characterized in that the tongue body has a long hole extending along the length of the tongue body, and the tongue fixation body enters the long hole so that the tongue body can move along the long hole.

4. A synthetic resin pipe stopper as described in any one of claims 1 to 3, characterized in that an uneven portion is formed on the surface of the clamping portion facing the inner surface of the receiving port that is pressed by the pressing body.

5. A synthetic resin pipe stopper as claimed in any one of claims 1 to 3, characterized in that the tongue body has ribs formed on both end edges extending in the direction of entry into the recess.

6. 5. A stopper for a synthetic resin pipe according to claim 4, wherein said tongue piece has ribs formed on both edge portions thereof extending in the direction of insertion into said recess.

7. A synthetic resin pipe stopper as described in any one of claims 1 to 3, characterized in that the inner surface of each of the ribs is located outside the widthwise side of the clamping portion, and serves as a guide when moving the tongue body.

8. 5. A synthetic resin pipe stopper according to claim 4, wherein the inner surfaces of the ribs serve as guides for moving the tongue pieces relative to the clamping portion.

9. 6. A stopper for a synthetic resin pipe according to claim 5, wherein the inner surface of each of said ribs serves as a guide when said tongue body is moved relative to said clamping portion.

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