JP2015021227A - Pipe with telescopic screw-type universal joint, and method for manufacturing pipe with telescopic screw-type universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe with a telescopic screw-type universal joint, in which an integration of the metallic pipe and the universal joint is extensible, the metallic pipe is prevented from coming out of the universal joint without increasing the number of parts, and even a thin thickness metallic pipe can be connected to the universal joint as that metallic pipe.SOLUTION: A metallic pipe 2 has an inserted part 20 into which a pipe-side insertion part 13 of a joint 3 is screw-inserted. In the pipe-side insertion part 13 of the joint 3, to be inserted into the inserted part 20, a helical groove 15 to be used for axially moving the metallic pipe 2 is provided on its outer periphery surface other than a tip portion. In an inner periphery surface of the inserted part 20, protrusions 21 to be fitted in the groove 15 are formed.

Description

  The present invention relates to a pipe with a stretchable joint formed by connecting a metal pipe and a joint, and a method for manufacturing a pipe with a stretchable joint.

  For example, Patent Document 1 discloses a structure of a telescopic joint composed of a pipe, a joint, and a nut as a joint for connecting a pipe used in a kitchen / basin of a house. A male screw is screwed on the outer peripheral surface of the joint. Further, a female screw is screwed on the inner peripheral surface of the pipe to which the joint is connected. The joint and the pipe are connected by screwing the male thread of the joint and the female thread of the pipe. And it is possible to adjust the axial length of a joint and piping by rotating a joint in the peripheral direction to piping.

JP 2005-213725 A

  Here, in the joint structure described in Patent Document 1, a nut for retaining is provided in addition to the pipe and the joint so that the joint does not come off from the pipe. For this reason, the number of parts increases and the cost increases.

  In addition, in pipes used for residential kitchens and sinks, thin metal pipes may be used. However, it is difficult to cut a screw on the inner peripheral surface of such a thin metal pipe. For this reason, as a metal pipe, a metal pipe with a thin tube thickness and a joint cannot be connected in a stretchable manner.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to extend a metal pipe and a joint from a joint to a metal pipe without increasing the number of parts. It is possible to prevent a metal pipe having a thin tube thickness from being connected as a metal pipe.

  The present invention is a pipe with an expandable joint formed by connecting a metal pipe and a joint. The metal pipe has an insertion portion into which the joint is inserted, and the insertion portion of the joint into the insertion portion has an outer peripheral surface excluding a tip portion and the metal pipe in the axial direction. A spiral groove for movement is provided, and a convex portion that fits into the groove is formed on the inner peripheral surface of the inserted portion.

  In the present invention, the insertion portion of the joint is provided with a spiral groove for moving the metal pipe in the axial direction on the outer peripheral surface excluding the tip portion. Protrusions that fit into the grooves are formed on the peripheral surface. For this reason, when the metal pipe is rotated with respect to the joint, the metal pipe moves in the axial direction with respect to the joint by rotating the convex portion along the spiral groove. The tip portion is not provided with a spiral groove. As a result, the metal pipe is prevented from coming out of the joint, but the number of parts does not increase because no member for preventing the metal pipe is used. Furthermore, in the case of a metal pipe with a thin tube thickness, since the screw that fits into the groove of the joint cannot be cut, in the present invention, the outer surface of the inserted portion is pressed to fit into the groove of the joint. Protruding parts can be formed. Thereby, a thin metal pipe can be connected as a metal pipe. Thus, according to the present invention, in the pipe with a telescopic joint in which the metal pipe and the joint can be stretched, it is possible to prevent the metal pipe from coming out of the joint without increasing the number of parts. Moreover, a thin metal pipe can be connected as a metal pipe.

It is a figure which shows the pipe with an expandable joint which concerns on 1st Embodiment of this invention. It is a fragmentary sectional view which shows the state before connection with metal pipes and a coupling. It is a figure for demonstrating the formation process which forms a convex part and a recessed part in metal pipes. It is sectional drawing of metal pipes. It is the VV sectional view taken on the line of FIG. 1 which abbreviate | omitted the coupling. It is a figure which shows the state which extended metal pipes and a coupling. It is a figure which shows the pipe with an expandable joint which concerns on 2nd Embodiment of this invention. It is sectional drawing of metal pipes. It is the IX-IX sectional view taken on the line of FIG. 7 which abbreviate | omitted the coupling.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the pipe 1 with a retractable joint according to the first embodiment of the present invention is formed by connecting a metal pipe 2 and a pipe side insertion portion 13 of the joint 3. A water hose 4 is connected to the hose side insertion portion 23 of the joint 3.

(hose)
The hose 4 is, for example, a resin-made flexible hose having a fiber reinforcing layer inside (fiber reinforced). The hose 4 is not limited to water use.

(Structure of pipe with expandable joint)
(Fitting)
As shown in FIGS. 1 and 2, the joint 3 includes a cylindrical hose side insertion portion 23 and a cylindrical pipe side insertion portion 13. The hose side insertion portion 23 is a portion to be inserted into the hose 4, and the pipe side insertion portion 13 is a portion to be inserted into the insertion portion 20 of the metal pipe 2. The joint 3 is made of, for example, copper or stainless steel having excellent corrosion resistance against chlorine contained in tap water. On the outer peripheral surface of the hose-side insertion portion 23, a ring-shaped engagement groove 24 with which the end of the cylindrical socket 6 is engaged is provided. Two ring-shaped seal grooves 14 into which the O-ring 5 is fitted are provided on the outer peripheral surface of the pipe-side insertion portion 13. The seal groove 14 is located at the tip of the pipe side insertion portion 13. Note that the number of seal grooves is not necessarily two. One may be sufficient and three or more may be sufficient. In the present embodiment, the two sealing grooves 14 are provided from the viewpoint of ensuring sufficient sealing performance at the connecting portion with the metal pipe 2 and not increasing the length of the joint 3 so much. Further, the pipe-side insertion portion 13 is provided with a spiral groove 15 on the outer peripheral surface excluding the tip portion. Specifically, the groove 15 is provided over substantially the entire axial direction of the portion of the pipe-side insertion portion 13 excluding the seal groove 14. This groove 15 is for moving the metal pipe 2 in the axial direction.

(Metal pipe)
As shown in FIGS. 1, 2, 4, and 5, the metal pipe 2 is a thin tube processed into a cylindrical shape. The thickness of the metal pipe 2 is, for example, in the range of 0.5 to 1.0 mm, and the tube thickness is thin. The metal pipe 2 is made of, for example, copper or stainless steel having excellent corrosion resistance against chlorine contained in tap water. The metal pipe 2 has an insertion portion 20 into which the pipe side insertion portion 13 of the joint 3 is inserted. Four convex portions 21 that fit into the grooves 15 are formed on the inner peripheral surface of the inserted portion 20. The convex portion 21 is formed along the spiral groove 15. The convex portions 21 are provided side by side in the axial direction, and the convex portions 21 adjacent in the axial direction are provided at positions that differ by about 180 degrees in the circumferential direction. Further, the convex portion 21 has a length of about one-eighth of the length of the inner peripheral surface of the inserted portion 20. That is, the convex portions 21 are formed in an arc shape (so as not to go around the inner peripheral surface of the inserted portion 20), and the convex portions 21 are not continuous with each other. Here, the “arc” is a part of the circumference, and the circular arc is synonymous with not making a round on the inner circumferential surface. Moreover, the circular arc angle of the convex part 21 is about 45 degree | times, and the convex part 21 is inferior arc. Note that an arc having an arc angle smaller than 180 degrees is referred to as “subordinate arc”, and an arc greater than 180 degrees is referred to as “super arc”. Four concave portions 22 are formed on the outer peripheral surface of the inserted portion 20 at positions corresponding to the four convex portions 21. That is, the convex portion 21 and the concave portion 22 face each other in the radial direction. In addition, the formation method of the convex part 21 and the recessed part 22 is mentioned later.

(Connection between hose and fitting)
With the end portion of the hose 4 inserted in the gap between the hose side insertion portion 23 of the joint 3 and the socket 6, the end portion of the hose 4 is connected to the joint 3 by caulking the socket 6 from its outer peripheral side. .

(Manufacturing method of pipe with expandable joint)
(Insertion process)
The O-ring 5 is fitted in each of the seal grooves 14 provided on the outer peripheral surface of the pipe side insertion portion 13 of the joint 3. Thereafter, the pipe side insertion portion 13 of the joint 3 is inserted into the inserted portion 20 of the metal pipe 2.

(Formation process)
As shown in FIG. 3, a protrusion that presses a portion corresponding to the groove 15 on the outer peripheral surface of the inserted portion 20 of the metal pipe 2 into which the pipe-side insertion portion 13 of the joint 3 is inserted and fits into the groove 15. The part 21 is formed in the inserted part 20. In this embodiment, the convex part 21 is formed by rolling. Specifically, the metal pipe 2 and the nipple 3 and the rolling die are relatively moved in the axial direction while pressing a portion corresponding to the groove 15 of the insertion portion 20 with a rolling die (not shown). The convex portion 21 is formed in an arc shape along the groove 15 by rotating about 1/8 in the circumferential direction. Similarly, four convex portions 21 are formed at positions different by about 180 degrees in the circumferential direction of the inserted portion 20. Here, when the outer peripheral surface of the inserted portion 20 is pressed, a concave portion 22 is formed on the outer peripheral surface of the inserted portion 20 at a position corresponding to the convex portion 21. Thus, the convex part 21 which fits into the groove | channel 15 of the pipe side insertion part 13 of the joint 3 is formed in the internal peripheral surface of the to-be-inserted part 20 of the metal pipe 2, thereby making the metal pipe 2 and the joint 3 are connected.

  When the metal pipe 2 is rotated with respect to the joint 3, the convex portion 21 rotates along the spiral groove 15 as shown in FIG. Move to. That is, the metal pipe 2 and the joint 3 can be extended in the axial direction. Further, the metal pipe 2 and the joint 3 can be contracted in the axial direction by rotating the metal pipe 2 with respect to the joint 3 in the opposite direction.

  In the present embodiment, the insertion portion 13 of the joint 3 is provided with a spiral groove 15 for moving the metal pipe 2 in the axial direction on the outer peripheral surface excluding the tip portion. A convex portion 21 that fits into the groove 15 is formed on the inner peripheral surface of the inserted portion 20. For this reason, when the metal pipe 2 is rotated with respect to the joint 3, the metal pipe 2 moves in the axial direction with respect to the joint 3 by rotating the convex portion 21 along the spiral groove. Here, the spiral groove 15 is not provided at the distal end portion of the insertion portion 13 of the joint 3. Thereby, the metal pipe 2 is prevented from coming off from the joint 3. That is, when the metal pipe 2 is rotated with respect to the joint 3 and the convex portion 21 moves to the terminal end (tip side) of the groove 15, the wall of the groove 15 and the convex portion 21 come into contact with each other to connect the metal pipe 2 to the joint. 3 cannot be rotated. At this time, since the convex portion 21 and the groove 15 are fitted, the metal pipe 2 does not move in the axial direction with respect to the joint 3 and does not come out of the joint 3. In the present embodiment, since no retaining member is used, the metal pipe 2 can be prevented from coming out of the joint 3 without increasing the number of parts.

  In the present embodiment, a recess 22 is formed on the outer peripheral surface of the inserted portion 20 at a position corresponding to the protrusion 21. When the pipe thickness of the metal pipe 2 is thin as in the present embodiment, the screw that fits into the groove 15 of the joint 3 cannot be cut. Therefore, in this embodiment, the outer peripheral surface of the inserted portion 20 is pressed ( By rolling, the concave portion 22 and the convex portion 21 that fits into the groove 15 of the joint 3 corresponding to the concave portion 22 can be formed. Thereby, a thin metal pipe can be connected as the metal pipe 2. Thus, according to this embodiment, in the pipe 1 with a telescopic joint in which the metal pipe 2 and the joint 3 can be stretched, the metal pipe 2 can be removed from the joint 3 without increasing the number of parts. In addition, a thin metal pipe can be connected as the metal pipe 2.

  Moreover, in this embodiment, the location corresponding to the groove | channel 15 of the outer peripheral surface of the insertion part 20 of the metal pipe 2 in which the pipe side insertion part 13 of the coupling 3 was inserted is pressed, and it fits into the groove | channel 15. By forming the convex portion 21 in the inserted portion 20, it is possible to realize both a stretchable configuration and a retaining configuration in one step. Even when the seal groove 14 is not provided, the groove 15 is not provided at the distal end portion of the pipe-side insertion portion 13.

  Further, in the present embodiment, the convex portion 21 that fits into the groove 15 of the joint 3 is formed in an arc shape along the spiral groove 15, that is, so as not to go around the inner peripheral surface of the inserted portion 20. ing. Therefore, rattling between the metal pipe 2 and the joint 3 can be prevented, so that the connection strength between the metal pipe 2 and the joint 3 can be improved. Moreover, when forming the convex part 21 in the spiral shape which makes the inner peripheral surface of the to-be-inserted part 20 1 round or more, the metal pipe 2 and the coupling 3 are pressed while pressing the to-be-inserted part 20 of the metal pipe 2 with a rolling die. However, in this embodiment, it is not necessary to make one turn. For this reason, it is easy to form the convex portion 21.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Components having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted as appropriate. As shown in FIGS. 7-9, in 2nd Embodiment, the convex part 31 and the recessed part 32 differ from 1st Embodiment.

  A convex portion 31 that fits into the groove 15 is formed on the inner peripheral surface of the inserted portion 20. The convex portion 31 is formed along the spiral groove 15. Further, the convex portion 31 is continuously formed in a spiral shape that makes about three rounds on the inner peripheral surface of the insertion target portion 20. That is, the convex portion 31 is formed in a spiral shape that makes one or more rounds on the inner peripheral surface of the inserted portion 20. A concave portion 32 is formed on the outer peripheral surface of the inserted portion 20 at a position corresponding to the convex portion 31.

  In order to form the convex portion 31 (concave portion 32), the metal pipe 2 and the joint 3 and the rolling die are relatively pressed while pressing the portion corresponding to the groove 15 of the inserted portion 20 with the rolling die. What is necessary is just to make about 3 rotations in the circumferential direction, moving in the axial direction (rolling process). Thereby, it is possible to form the spiral convex part 31 along the groove 15.

  In the present embodiment, as described above, the convex portion 31 is formed in a spiral shape that makes one or more rounds on the inner peripheral surface of the inserted portion 20. Therefore, since the groove 15 and the convex portion 31 of the joint 3 are fitted over a long distance, rattling between the metal pipe 2 and the joint 3 can be further prevented. Thereby, the connection strength of the metal pipe 2 and the joint 3 can be further improved.

  The embodiment of the present invention has been described above. However, the form to which the present invention can be applied is not limited to the above-described embodiment, and may be changed as appropriate without departing from the spirit of the present invention, as exemplified below. Can be added.

  In the first embodiment described above, the convex portion 21 (concave portion 22) is formed by rolling. Not only this but the convex part 21 may be formed by press work (caulking). In order to form the convex portion 21 by pressing, the portion corresponding to the groove 15 on the outer peripheral surface of the inserted portion 20 of the metal pipe 2 is set to about 8 minutes of the length of the outer peripheral surface of the inserted portion 20. By caulking in four places over one, four convex portions 21 can be formed in an arc shape along the groove 15. According to the press working, four convex portions 21 (concave portions 22) are formed at a time by caulking the portions corresponding to the grooves 15 on the outer peripheral surface of the insertion portion 20 of the metal pipe 2. be able to.

  In the first embodiment described above, four convex portions 21 (concave portions 22) are provided, but the number of convex portions is not limited to this. Moreover, the length, position, etc. of the convex part 21 can also be changed suitably.

  In the second embodiment described above, the convex portion 31 is continuously formed in a spiral shape that makes about three rounds of the inner peripheral surface of the insertion target portion 20. However, the present invention is not limited to this, and the convex portion is continuous. In particular, it may be formed in a spiral shape that makes one or more rounds on the inner peripheral surface of the inserted portion 20.

  In the first embodiment described above, the convex portion 21 (concave portion 22) has an arc shape. However, the present invention is not limited to this and may not be an arc shape. A point-shaped convex portion (concave portion) that fits into the groove 15 of the joint 3 may be used.

  In the above-described embodiment, the joint 3 is made of, for example, copper or stainless steel, but is not limited thereto, and may be made of a resin such as PPS (polyphenylene sulfide).

DESCRIPTION OF SYMBOLS 1 Pipe with a telescopic joint 2 Pipe 3 Joint 4 Hose 5 O-ring 6 Socket 13 Pipe side insertion part 14 Seal groove 15 Groove 20 Inserted part 21, 31 Convex part 22, 32 Concave part 23 Hose side insertion part 24 Engagement groove

Claims (6)

A pipe with a telescopic joint formed by connecting a metal pipe and a joint,
The metal pipe has an insertion portion into which the joint is inserted,
The insertion portion of the joint to the insertion portion is provided with a spiral groove for moving the metal pipe in the axial direction on the outer peripheral surface excluding the tip portion.
A projecting portion that fits into the groove is formed on the inner peripheral surface of the inserted portion.   The pipe with an expandable joint according to claim 1, wherein the convex portion is formed in an arc shape along the spiral groove.   The pipe with an expandable joint according to claim 1, wherein the convex portion is formed in a spiral shape that makes one or more rounds on the inner peripheral surface of the inserted portion. A method of manufacturing a pipe with an expandable joint formed by connecting a metal pipe and a joint,
The metal pipe has an insertion portion into which the joint is inserted,
The insertion portion of the joint to the insertion portion is provided with a spiral groove for moving the metal pipe in the axial direction on the outer peripheral surface excluding the tip portion.
An insertion step of inserting the insertion portion of the joint into the inserted portion of the metal pipe;
A forming step of pressing a portion corresponding to the groove on the outer peripheral surface of the insertion portion into which the insertion portion is inserted, and forming a convex portion that fits into the groove in the insertion portion;
A method for manufacturing a pipe with a telescopic joint, characterized by comprising:   5. The method for manufacturing a pipe with an expandable joint according to claim 4, wherein, in the forming step, the convex portion is formed in an arc shape along the spiral groove.   5. The method for manufacturing a pipe with an expandable joint according to claim 4, wherein, in the forming step, the convex portion is formed in a spiral shape that makes one or more rounds of the inner peripheral surface of the inserted portion.

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