JP2012057704A - Retaining means for connecting pipe body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an operator's time loss, and to reduce connection cost when pipe bodies are connected.SOLUTION: The connected state of pipe bodies is maintained by being fitted to pipe bodies 1 and 2 when the pipe bodies 1 and 2 are connected by fitting a second plastic pipe body 2 to a first plastic pipe body 1 and fixing them with glue. At each axial end, three or more projections 12 and 13 are circumferentially formed which are slanted so as to tilt toward the axial center with respect to the radially inward direction while projecting radially inward rather than the inner peripheral surface, and hold the respective pipe bodies 1 and 2 so as to be surrounded by being elastically deformed in the radially outward direction when fitted to the pipe bodies 1 and 2.

Description

  The present invention relates to a tube connection maintenance tool.

  Synthetic resin pipe joints are used when connecting a pair of synthetic resin pipes in a hot and cold water supply pipe and a drain pipe. As such a pipe joint, as shown in FIG. 12, there is one in which a pair of tapered holes 23 to which the synthetic resin pipe 21 is connected are formed at both ends in the axial center inside the pipe joint 22. The taper hole 23 is tapered toward the central portion in the axial center direction in order to cope with manufacturing errors of the synthetic resin tube 21, and the inner diameter of the inner side of the inner end of the small diameter side, that is, the small diameter side end portion. The outer diameter is slightly smaller than the outer diameter. When the pair of synthetic resin pipes 21 are connected by the pipe joint 22, an adhesive is applied to the outer peripheral surface of the end portion of the synthetic resin pipe 21 and the inner peripheral surface of the tapered hole 23, and then each synthetic resin pipe 21. These end portions are forcibly pushed into the taper hole 23 and bonded (for example, see Patent Document 1).

JP 2000-18471 A

  In the above case, since the synthetic resin tube 21 is inserted into the tapered hole 23, the actual bonding area between the synthetic resin tube 21 and the inner peripheral surface of the tapered hole 23 is very small. Therefore, at the time of the connection, it is necessary to maintain the connection state of the synthetic resin pipe 21 and the pipe joint 22 for several tens of seconds until the adhesive is solidified and exhibits a predetermined connection strength. If this is not done, the fixing with the adhesive will be insufficient, and the synthetic resin tube 21 forced into the taper hole 23 will be pushed out of the taper hole 23, or the synthetic resin tube 21 will be inside the taper hole 23. There is a possibility of being fixed at an angle.

  Therefore, conventionally, the connection state of the synthetic resin pipe 21 and the pipe joint 22 is maintained for several tens of seconds by hand or a special tool. However, maintaining by hand was cumbersome and time consuming for workers. Moreover, if a special tool is used, the problem of maintaining by hand can be solved. However, since the tool is expensive, there is a new problem that the connection cost becomes high.

  An object of this invention is to provide the maintenance tool for the connection of a tubular body which can solve the said problem.

In order to achieve the above object, the tubular body connection maintenance tool of the present invention is characterized in that a synthetic resin second tube is externally fitted to a synthetic resin first tube, and an adhesive is used. When the pipes are fixed and connected to each other, the pipes are externally fitted to maintain the connection state of the pipes, and the inner circumferences of the end portions in the axial direction are maintained. On the surface,
It protrudes inward in the radial direction from the inner peripheral surface, and is inclined so as to move toward the center in the axial direction as it goes inward in the radial direction. The point is that three or more protrusions are provided in the circumferential direction to elastically deform and hold each tubular body in a surrounding shape.
Note that the inner peripheral surface may be formed in an arc shape having a size of a semicircle or more.
Moreover, it may be cylindrical.
In addition, A. A small-diameter portion fitted around the first tubular body; A large-diameter portion fitted on the second tubular body; There may be a connecting portion that connects the small diameter portion and the large diameter portion.
In addition, the protrusions may be arranged at equal intervals in the circumferential direction.
Further, the inside of the end portion of the second tubular body that is externally fitted to the first tubular body may be a tapered hole that is tapered toward the opposite end portion.
The second pipe body may be a pipe joint.

  According to the present invention, since the maintenance tool is used to maintain the connection state at the time of connection of the pipe body, it is not necessary to maintain the connection state by hand, and is not troublesome. There is no loss of time. Moreover, since it is not necessary to use an expensive and special tool, the connection cost of the pipe can be reduced. Furthermore, the protrusion of the maintenance tool can prevent the maintenance tool from being displaced in the axial direction from the connection portion of the tubular body. In addition, since the maintenance tool is left in a state of being externally fitted to the connection portion of both pipes after the pipes are connected, the connection strength of the pipes can be improved.

It is a longitudinal cross-sectional view which shows the 1st example of embodiment of this invention. It is a side view of the principal part of FIG. It is AA arrow sectional drawing of FIG. It is a BB arrow directional cross-sectional view of FIG. FIG. 3 is a longitudinal sectional view for explaining the connection method of FIG. 1. FIG. 3 is a longitudinal sectional view for explaining the connection method of FIG. 1. It is CC sectional view taken on the line of FIG. It is DD sectional view taken on the line of FIG. It is a cross-sectional view which shows the 2nd example of embodiment of this invention. It is a longitudinal cross-sectional view which shows the 3rd example of embodiment of this invention. It is a cross-sectional view which shows the 4th example of embodiment of this invention. It is a longitudinal cross-sectional view which shows a prior art example.

  Hereinafter, a first example of an embodiment of the present invention will be described based on the drawings of FIGS. 1 to 8. FIG. 1 shows a state in which a pair of synthetic resin pipes 1 are connected by a pipe joint 2 and a connection maintenance tool 3. Show. In FIG. 1, for the sake of convenience, the maintenance tool 3 is used only for connecting the right synthetic resin pipe 1 and the pipe joint 2, but the maintenance tool 3 is connected to the left synthetic resin pipe 1 and the pipe joint 2. Sometimes used for.

  The synthetic resin tube 1 is exemplified as a first tube having a small diameter, and is formed of a soft or hard synthetic resin. Both the synthetic resin tubes 1 have the same shape apart from the length. . The inner and outer peripheral surfaces of the synthetic resin tube 1 are smooth curved surfaces, and the inner diameter and the outer diameter are (substantially) constant over the entire axial length. Hard vinyl chloride resin is used as the synthetic resin. The pipe joint 2 is also formed of the same synthetic resin.

  A pipe joint (socket) 2 connects both synthetic resin pipes 1 and is exemplified as a large-diameter second pipe body. The pipe joint 2 is formed into a cylindrical shape, and both axial ends in the inside thereof are formed as a pair of tapered holes 5 into which the synthetic resin pipe 1 is inserted, and the axially central portion of the inner peripheral surface thereof is The protrusion 6 protrudes radially inward over the entire circumference. The tapered hole 5 is tapered toward the central portion in the axial direction, and the inner diameter of the inner side of the inner side, that is, the small diameter side end portion, is smaller than the outer diameter of the synthetic resin tube 1.

  As shown in FIG. 2 to FIG. 8, the connection maintenance tool (fixing tool, holding tool, clamp) 3 is externally fitted to the synthetic resin pipe 1 and the pipe joint 2 to maintain the connection state thereof. It is cylindrical. The maintenance tool 3 includes a small diameter portion 8 that is externally fitted to the synthetic resin pipe 1, a large diameter portion 9 that is externally fitted to the end of the pipe joint 2, and a connecting portion that connects the small diameter portion 8 and the large diameter portion 9. 10 and is integrally formed. The maintenance tool 3 is made of metal such as steel. In addition, although the thickness of the maintenance tool 3 is thinner than shown in the drawing, it is drawn thicker than the actual thickness in the drawing for easy understanding.

  The small-diameter portion 8 and the large-diameter portion 9 have three or more small-diameter-side and large-diameter-side projections 12 and 13 that are integrally formed with each other and that can be elastically deformed radially outwardly at equal intervals in the circumferential direction ( In the example shown, 10 pieces are provided. The protrusions 12 and 13 protrude inward in the radial direction from the inner peripheral surface of the small diameter portion 8 or the large diameter portion 9 and are inclined so as to move to the central portion in the axial center direction toward the radially inward direction. For example, it has a substantially quadrangular pyramid shape and is sharpened. As shown in FIG. 7, when assuming a virtual circle 14 in which the tip of each small-diameter portion side projection 12 is on the circumference, the diameter of the virtual circle 14 is smaller than the outer diameter of the synthetic resin tube 1. . Further, as shown in FIG. 8, when assuming a virtual circle 15 in which the tip of each large-diameter portion side protrusion 13 is on the circumference, the diameter of the virtual circle 15 is smaller than the outer diameter of the pipe joint 2. Is done. As a result, when the retainer 3 is externally fitted to the synthetic resin pipe 1 and the pipe joint 2, the small diameter side and large diameter side protrusions 12 and 13 are radially outward with respect to the synthetic resin pipe 1 and the pipe joint 2. The plastic resin 1, the pipe joint 2, and the maintenance tool 3 are aligned with each other by holding the synthetic resin pipe 1 and the pipe joint 2 in a surrounding shape. Further, in the small diameter portion 8 and the large diameter portion 9, window portions 16, 17 corresponding to the protrusions 12, 13 are formed at locations where the small diameter portion side / large diameter portion side protrusions 12, 13 are formed. , 13 is allowed to be elastically deformed radially outward.

  The connecting portion 10 is tapered toward the small-diameter portion 8 that is one of the axial directions, and is externally fitted across the end portion of the pipe joint 2 and the synthetic resin pipe 1. The connecting portion 10 may or may not come into contact with the edge of the pipe joint 2. When the connecting portion 10 is brought into contact with the pipe joint 2, the connecting portion 10 serves as a stopper for the pipe joint 2. This serves to prevent the pipe joint 2 from being inserted into the connecting portion 10 more than necessary.

  According to the above configuration example, when the pair of synthetic resin pipes 1 are connected by the pipe joint 2, first, as shown in FIGS. 5 and 6, the large diameter of the maintenance tool 3 at one end of the pipe joint 2. The part 9 is relatively externally fitted. At this time, the large-diameter portion side protrusion 13 is elastically deformed radially outward, and slides on the outer peripheral surface of the pipe joint 2 in the axial direction.

  In this case, when the maintenance tool 3 is moved relatively to the central portion side in the axial direction of the pipe joint 2, the large-diameter portion side protrusion 13 merely slides as described above, and does not have any resistance. The maintenance tool 3 can be easily moved. However, conversely, if the maintenance tool 3 is moved relatively to the end portion side of the pipe joint 2, the large-diameter portion side protrusion 13 acts to bite into the outer peripheral surface of the pipe joint 2. Thereby, a large resistance is generated, and it is very difficult or impossible to move the maintenance tool 3 relatively to the end side of the pipe joint 2.

  After fitting the maintenance tool 3 to the pipe joint 2 to a predetermined position as described above, an adhesive is applied to the inner peripheral surface of the tapered hole 5 of the pipe joint 2 and the outer peripheral surface of the end portion of the synthetic resin pipe 1. To do. Thereafter, as shown in FIGS. 6 and 1, the end portion of the synthetic resin pipe 1 is fitted into the tapered hole of the pipe joint 2 while relatively fitting the small diameter portion 8 of the retainer 3 to the end portion of the synthetic resin pipe 1. Force it into 5 and bond. Note that an adhesive may be applied to the inner peripheral surface of the tapered hole 5 of the pipe joint 2 and the outer peripheral surface of the end portion of the synthetic resin pipe 1 before the fitting 3 is externally fitted to the pipe joint 2.

  By the way, even when the small diameter portion 8 of the retainer 3 is externally fitted to the end portion of the synthetic resin tube 1, the small diameter portion side protrusion 12 is elastically deformed radially outward, and the outer peripheral surface of the synthetic resin tube 1 is axially centered. Slide in the direction. In this case as well, when the maintenance tool 3 is moved relatively to the axial center side of the synthetic resin tube 1, the small-diameter portion side projection 12 merely slides as described above, so that there is no resistance. Therefore, the maintenance tool 3 can be moved easily. However, conversely, if the maintenance tool 3 is moved relatively to the end edge side of the synthetic resin pipe 1, the small-diameter portion side projection 12 acts to bite into the outer peripheral surface of the pipe joint 2. Thereby, a large resistance is generated, and it is extremely difficult or impossible to move the maintenance tool 3 relatively to the end edge side of the pipe joint 2.

  As described above, the maintenance tool 3 is fitted onto the synthetic resin pipe 1 and the pipe joint 2 so that the axes of these three members coincide with each other, and the synthetic resin pipe 1 and the pipe joint 2 are connected in a correct connection posture. The state is maintained. Moreover, the maintenance tool 3 is not likely to be displaced in the axial direction from the connection portion between the synthetic resin pipe 1 and the pipe joint 2 by the small diameter side / large diameter part side projections 12 and 13.

  By the way, after several tens of seconds have passed in the above-mentioned connection state, the adhesive is solidified and exhibits a predetermined connection strength. Therefore, the synthetic resin pipe 1 and the pipe joint 2 are firmly connected in a correct connection posture, and are tapered holes. There is no possibility that the synthetic resin tube 1 forced into 5 is pushed out from the tapered hole 5 or that the synthetic resin tube 1 is obliquely fixed in the tapered hole 5. Even after the connection, the retainer 3 is left in a state of being externally fitted to the synthetic resin pipe 1 and the pipe joint 2, so that the connection strength between the synthetic resin pipe 1 and the pipe joint 2 can be improved.

  As described above, when the pipe joint 2 and the synthetic resin pipe 1 are connected, the maintenance tool 3 is used to maintain the connection state. Therefore, it is not necessary to maintain the connection state by hand. It is not bothersome and there is no loss of time for workers. Moreover, since it is not necessary to use an expensive and special tool, the connection cost between the pipe joint 2 and the synthetic resin pipe 1 can be reduced.

  FIG. 9 shows a second example of the embodiment of the present invention, in which the maintenance tool 3 has a shape in which a part of a cylinder is cut out, and its cross section has an arc shape with a size of a semicircle or more. Yes.

  FIG. 10 shows a third example of the embodiment of the present invention, in which the connecting portion 10 is not tapered but is projected straight out from the small diameter portion 8 in the radial direction.

  FIG. 11 shows a fourth example of the embodiment of the present invention, in which the small-diameter portion side protrusion 12 is formed long in the circumferential direction. Although not shown, the large-diameter portion side projection is similarly configured.

  In the above embodiment, the first pipe is a synthetic resin pipe and the second pipe is a pipe joint. However, both pipes may be a synthetic resin pipe as in the above embodiment. In the above embodiment, the protrusions are arranged at equal intervals in the circumferential direction. However, the protrusions may not be arranged at equal intervals in the circumferential direction as long as the tubular body can be held.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a tubular body connection maintenance tool that can be used to connect a synthetic resin pipe and a pipe joint.

1 Synthetic resin pipe (first tube)
2 Pipe joint (second pipe)
3 Connection maintenance tool 5 Tapered hole 8 Small diameter part 9 Large diameter part 10 Connection part 12, 13 Small diameter part side, large diameter part side protrusion

Claims (7)

The second tube made of synthetic resin is fitted on the first tube made of synthetic resin, fixed with an adhesive, and when both tubes are connected, they are fitted on both tubes, A connection maintenance tool for a tubular body that maintains a connection state,
At each end in the axial direction,
・ It protrudes radially inward from the inner peripheral surface and is inclined to move toward the center in the axial direction as it goes radially inward. A tubular body connection maintenance tool in which three or more protrusions that are elastically deformed to hold each tubular body in a surrounding shape are arranged in the circumferential direction.   The maintenance tool for connecting pipes according to claim 1, wherein the inner peripheral surface has an arc shape having a size of a semicircle or more.   The maintenance tool for connecting pipes according to claim 1, which is tubular. A. A small-diameter portion that is externally fitted to the first tubular body;
B. A large-diameter portion fitted on the second tubular body;
C. The maintenance tool for connecting pipes according to any one of claims 1 to 3, further comprising a connecting portion that connects the small diameter portion and the large diameter portion.   The maintenance tool for connecting pipes according to any one of claims 1 to 4, wherein the protrusions are arranged at equal intervals in the circumferential direction.   The tubular body according to any one of claims 1 to 5, wherein an inside of an end portion fitted to the first tubular body in the second tubular body is a tapered hole tapered toward the opposite end portion. Connection maintenance tool. The maintenance tool for connecting pipes according to any one of claims 1 to 6, wherein the second pipe is a pipe joint.

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