JP2007177978A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint which effectively suppresses coming-off of a connected pipe while avoiding the trouble wherein the pipe is cut when force of coming-off is momentarily applied thereto. <P>SOLUTION: The joint 10 comprises: an anti-coming-off ring 23 to bite into the pipe 11 with the diameter shrunk when force of coming-off is applied to the pipe 11 inserted into a joint body 12 for restricting the coming-off of the pipe 11; and an auxiliary ring 27 laid on the pipe-inserted side of the anti-coming-off ring 23. The anti-coming-off ring 23 consists of: an annular base ring 23a; and a restricting piece 23b extending from the inner periphery thereof, obliquely to the inserting direction of the pipe 11. The auxiliary ring 27 consists of: an annular auxiliary base ring 27a; and an auxiliary restricting piece 27b extending from the inner periphery thereof, obliquely to the inserting direction of the pipe 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a joint used for connecting ends of pipes (tube materials) or ends of a pipe and a faucet device in, for example, a water supply or hot water supply piping system.

Conventionally, a joint for connecting a pipe to the joint with one touch is known (see, for example, Patent Document 1). That is, this joint includes a cylindrical socket (joint body) to which a pipe is connected, a cap (nut) screwed to the joint body, and a pipe holding ring disposed between the nut and the joint body. (Retaining ring) and a backup ring provided along with the retaining ring. The backup ring is disposed on the inlet side in the pipe insertion direction with respect to the retaining ring, and a protrusion protruding in the inclination direction of the claw provided on the retaining ring is formed at the tip of the backup ring. In a joint configured in this way, when a force in the pulling direction is applied to the pipe, the backup ring is restrained so that the claw of the retaining ring does not warp, and the connection between the pipe and the joint body is maintained. Yes.
Japanese Patent Laid-Open No. 3-69894 (pages 1 to 3)

  However, the joint described in Patent Document 1 has the following problems. In other words, when the inner diameter is set to be large so that the amount of biting of the retaining ring against the pipe is reduced, the retaining ring does not sufficiently bite into the pipe when the pulling force is instantaneously applied to the pipe. However, the pipe sometimes slips out of the joint while cutting the outer periphery of the pipe. Conversely, when the inner diameter was set to be small so as to increase the amount of the retaining ring that bites into the pipe, the resistance when inserting the pipe increased, making it difficult to construct, and pulling force was instantaneously applied to the pipe. At times, there is a problem that the claw of the retaining ring may bite into the pipe and the pipe may be cut.

  Accordingly, an object of the present invention is to effectively prevent the connected pipe from being pulled out, and to avoid a situation where the pipe is cut even when a drawing force is instantaneously applied to the pipe. It is to provide a joint.

  In order to achieve the above object, the joint according to the first aspect of the present invention is a retainer for reducing the diameter when a pulling force is applied to the pipe inserted into the joint body and biting into the pipe to restrict the withdrawal of the pipe. In the joint provided with the ring, the retaining ring is composed of an annular base ring and a restricting piece that extends from the inner periphery of the base ring in an inclining direction of the pipe, and an annular auxiliary base. An auxiliary ring having a ring and an auxiliary restricting piece extending obliquely from the inner peripheral portion of the auxiliary base ring in the pipe insertion direction is arranged side by side on the pipe insertion side of the retaining ring, and is regulated by the pulling force applied to the pipe The auxiliary restricting piece limits the inclination of the piece, and the auxiliary restricting piece grasps the pipe and restricts the withdrawal. It is an.

The joint according to a second aspect of the invention is characterized in that, in the invention according to the first aspect, the inner diameter of the auxiliary ring is set larger than the inner diameter of the retaining ring.
According to a third aspect of the present invention, in the invention according to the first or second aspect, the inner diameter of the auxiliary ring is set larger than the outer diameter of the pipe.

  According to a fourth aspect of the present invention, in the joint according to any one of the first to third aspects, the thickness of the auxiliary ring is set to be greater than the thickness of the retaining ring so as to increase rigidity. It is characterized by comprising.

According to the present invention, the following effects can be exhibited.
In the joint according to the first aspect of the present invention, the auxiliary ring is arranged side by side on the pipe insertion side of the retaining ring. When the pulling force is applied to the pipe and the restriction piece of the retaining ring bites into the pipe and is inclined, the inclination is limited by the auxiliary restriction piece of the auxiliary ring. Further, the auxiliary restricting piece of the auxiliary ring grips the pipe and assists in restricting the withdrawal of the pipe. Therefore, the collaborative action of the retaining ring and the auxiliary ring can effectively prevent the connected pipe from coming out and avoid the situation where the pipe is cut even when the pulling force is applied to the pipe instantaneously. can do.

  In the joint of the invention according to claim 2, since the inner diameter of the auxiliary ring is set larger than the inner diameter of the retaining ring, in addition to the effect of the invention according to claim 1, the auxiliary ring supports the retaining ring. Can be effective.

  In the joint according to the third aspect of the invention, since the inner diameter of the auxiliary ring is set larger than the outer diameter of the pipe, in addition to the effect of the invention according to the first or second aspect, Since the resistance of the auxiliary ring is not received when the pipe is inserted, the pipe can be inserted easily.

  In the joint according to the fourth aspect of the present invention, the thickness of the auxiliary ring is set to be thicker than the thickness of the retaining ring, and the rigidity is increased. For this reason, in addition to the effect of the invention according to any one of claims 1 to 3, the auxiliary ring effectively restricts the inclination of the regulating piece of the retaining ring, and the retaining piece of the retaining ring bites into the pipe. Can be suppressed.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, for example, a pipe (pipe material) 11 through which water passes is connected to a one-touch joint, that is, a joint 10 that can be retained by simply inserting a pipe 11. The base end portion of the joint body 12 constituting the joint 10 is provided with a male screw portion 13 that is screwed into a pipe body such as a water pipe (not shown), and a guide tube portion 14 that is reduced in diameter and extends at the tip portion. Is provided. Here, for each member, the left side in FIG. 1 is referred to as a base end (base end side), and the right side in FIG. The joint body 12 is formed in a substantially cylindrical shape, and water is circulated through the through-hole 15 therein. An end portion of the pipe 11 is externally fitted and connected to the guide tube portion 14. The pipe 11 is made of a synthetic resin such as polyolefin (crosslinked polyethylene, polybutene, etc.) or a metal such as an alloy (brass, bronze, etc.).

  A tool engaging portion 16 having a hexagonal shape as viewed from the axial direction for engaging a tool such as a spanner is provided at the center of the joint body 12. A substantially cylindrical barrel 17 constituting the joint body 12 is connected to the distal end side of the joint body 12 by a screwed relationship between a male screw 18 and a female screw 19.

  A tightening nut 21 constituting the joint main body 12 is screwed to the threaded portion 20 on the outer periphery of the front end of the body cylinder body 17, and between the front end surface of the body cylinder body 17 and a step portion 22 on the inner periphery of the tightening nut 21. The base ring 23a of the retaining ring (lock ring) 23 is held. As shown in FIGS. 2 and 3 (a) and 3 (b), the retaining ring 23 is bent obliquely from the outer peripheral side base ring 23a and the inner peripheral portion of the base ring 23a. And a plurality of (16 in the present embodiment) restricting pieces 23b. Each regulating piece 23b has a substantially pentagonal plate shape. The retaining ring 23 is formed of stainless steel to a thickness of 0.2 to 0.3 mm, the regulating piece 23b is inclined in the insertion direction of the pipe 11, and the inclination angle (inclination angle with respect to the axial direction of the joint body 12) is about It is set to 45 degrees. As shown in FIG. 1, a seal member 24 is attached to the threaded portion 20 between the barrel cylinder 17 and the tightening nut 21 to seal and tighten water between the barrel cylinder 17 and the tightening nut 21. It functions to prevent the attached nut 21 from loosening.

  On the inner peripheral surface of the tightening nut 21, an inclined surface 25 is formed that extends from the step portion 22 to the tip side. The inclination angle of the inclined surface 25 (inclination angle with respect to the axial direction of the joint body 12) is set to about 30 degrees. A pipe insertion space 26 into which the pipe 11 is inserted is formed in a space between the outer peripheral surface of the guide cylinder portion 14 and the inner peripheral surfaces of the barrel cylinder 17 and the tightening nut 21.

  A metal auxiliary ring 27 is disposed on the leading end side of the retaining ring 23 in the inner space of the tightening nut 21, that is, on the insertion side of the pipe 11 so as to overlap the retaining ring 23. As shown in FIGS. 2 and 4 (a) and 4 (b), the auxiliary ring 27 is bent from the outer peripheral side auxiliary base ring 27a having an annular shape and the inner peripheral portion of the auxiliary base ring 27a so as to be inclined. And a plurality (16 in this embodiment) of auxiliary restricting pieces 27b extending. Each auxiliary regulating piece 27b has a substantially trapezoidal plate shape, and its inner peripheral edge swells in an arc shape inwardly.

  The auxiliary ring 27 is formed of stainless steel to a thickness of 0.3 to 0.5 mm, and the auxiliary restricting piece 27b is inclined in the insertion direction of the pipe 11, and the inclination angle is set to about 45 degrees same as that of the retaining ring 23. ing. The inner diameter of the auxiliary ring 27 (the diameter of the circle when the circle connecting the inner ends of the auxiliary restricting pieces 27b is viewed from the axial direction) is the inner diameter of the retaining ring 23 (the circle connecting the inner ends of the restricting pieces 23b). Is larger than the diameter when viewed from the axial direction. The thickness of the auxiliary ring 27 is set so as to be thicker than the thickness of the retaining ring 23, and is configured to increase its rigidity. In the present embodiment, each auxiliary restricting piece 27b of the auxiliary ring 27 is disposed so as to overlap with each restricting piece 23b of the retaining ring 23, and when the pulling force is applied to the pipe 11, the restricting pieces 23b are inclined. Each auxiliary restricting piece 27b receives the force.

  As shown in FIG. 5A, a gap s is formed between the tip of the auxiliary base ring 27a of the auxiliary ring 27 and the stepped portion 22 of the tightening nut 21, and the retaining ring 23 and the auxiliary ring 27 are connected to the pipe. 11 can be rotated (co-rotated). The gap s is preferably formed to be 0.1 to 0.4 mm.

  The inner diameter of the auxiliary ring 27 is not particularly limited and may be smaller than the outer diameter of the pipe 11. However, in order to eliminate the resistance when the pipe 11 is inserted into the pipe insertion space 26 and facilitate insertion, It is preferable to set so as to be larger than the diameter.

  As shown in FIG. 1, two annular grooves 28 are formed in the base end side of the guide tube portion 14, and seal rings 29 having different shapes are fitted into the guide tube portion 14. Water is sealed between the inner peripheral surface of the pipe 11 inserted into the space 26. The inner peripheral surface of the pipe 11 is pressed against the distal end portion of the guide tube portion 14, and the pipe 11 is prevented from coming off in cooperation with the regulating piece 23b of the retaining ring 23 and the auxiliary regulating piece 27b of the auxiliary ring 27. A portion 30 is provided. The flange 30 also has a function of correcting the deformation of the pipe 11 when the pipe 11 is inserted. Note that a plurality (six in this embodiment) of confirmation holes 31 for confirming the insertion state of the pipe 11 are provided in the trunk cylinder 17. The confirmation hole 31 is covered with a transparent resin film that allows the inside to be seen through and does not contain dust.

  Now, the operation of the present embodiment will be described. As shown in FIG. 5A, when the pipe 11 is inserted into the pipe insertion space 26 from the opening end of the tightening nut 21, the pipe 11 passes through the auxiliary ring 27. Then, it comes into sliding contact with the restriction piece 23b of the retaining ring 23 and stops at the innermost part of the pipe insertion space 26 while expanding the deformation of the restriction piece 23b. At this time, since the inner diameter of the auxiliary ring 27 is set larger than the outer diameter of the pipe 11, there is no resistance of the auxiliary regulating piece 27 b when the pipe 11 is inserted, and the retaining ring 23 is 1 when passing through the retaining ring 23. Since it is a sheet, there is little resistance at the time of insertion, and the pipe 11 can be inserted smoothly.

  Next, as shown in FIG. 5B, when a pulling force is applied to the pipe 11 connected to the joint body 12, the regulating piece 23 b of the retaining ring 23 bites into the outer peripheral portion of the pipe 11, and its axial direction The inclination angle of the restricting piece 23b becomes larger. At that time, since the restriction piece 23b of the retaining ring 23 hits the auxiliary restriction piece 27b of the auxiliary ring 27, the force is received by the auxiliary restriction piece 27b. At the same time, the auxiliary restricting piece 27b of the auxiliary ring 27 acts to grip the pipe 11 by contacting the pipe 11, and tightens and holds the outer peripheral surface of the pipe 11.

  As shown in FIG. 5 (c), when a stronger pulling force is applied to the pipe 11, the restriction piece 23b of the retaining ring 23 bites into the outer periphery of the pipe 11, and the inclination angle of the restriction piece 23b with respect to the axial direction thereof. Becomes even larger. At this time, a strong force is applied from the restricting piece 23b of the retaining ring 23 to the auxiliary restricting piece 27b of the auxiliary ring 27. However, since the auxiliary ring 27 is formed thicker than the retaining ring 23 and has increased rigidity, The inclination of the restriction piece 23b is restricted, and excessive biting of the restriction piece 23b into the pipe 11 is suppressed. At the same time, the auxiliary restricting piece 27b of the auxiliary ring 27 can also bite into the pipe 11, and the outer peripheral surface of the pipe 11 can be strongly pressed and tightened. In addition, the collar portion 30 at the tip of the guide tube portion 14 contacts and bites into the inner peripheral portion of the pipe 11. Therefore, in addition to the biting of the retaining ring 23 and the auxiliary ring 27 into the pipe 11, the pipe 11 can be securely prevented from coming off by tightening the auxiliary ring 27 and pressing and biting the pipe 11 by the flange portion 30 of the guide tube portion 14. Done.

The effects exhibited by the embodiment described in detail above will be collectively described below.
In the joint 10 of the present embodiment, the auxiliary ring 27 is disposed so as to overlap the pipe insertion side of the retaining ring 23. Therefore, the collaborative action of the retaining ring 23 and the auxiliary ring 27 can effectively prevent the connected pipe 11 from being pulled out, and the pipe 11 can be cut even when a pulling force is instantaneously applied to the pipe 11. Can be avoided.

  -By setting the inner diameter of the auxiliary ring 27 to be larger than the inner diameter of the retaining ring 23, the auxiliary ring 27 can support and assist the retaining ring 23.

  -By setting the inner diameter of the auxiliary ring 27 to be larger than the outer diameter of the pipe 11, the resistance of the auxiliary ring 27 is not received when the pipe 11 is inserted into the joint body 12, so that the pipe 11 can be easily inserted. Can be done.

  -By setting the thickness of the auxiliary ring 27 to be greater than the thickness of the retaining ring 23 to increase the rigidity, the auxiliary ring 27 effectively tilts the regulating piece 23b of the retaining ring 23. It can restrict | limit and can suppress the biting of the control piece 23b of the retaining ring 23 with respect to the pipe 11. FIG.

  A gap s is provided between the outer peripheral end surface of the auxiliary base ring 27a of the auxiliary ring 27 and the stepped portion 22 of the tightening nut 21, and the retaining ring 23 and the auxiliary ring 27 are configured to be movable. . For this reason, the retaining ring 23 and the auxiliary ring 27 can be rotated following the rotation of the pipe 11.

In addition, the said embodiment can also be changed and comprised as follows.
As shown in FIG. 6, the shape of the retaining ring 23 can be configured such that the inner peripheral edge of each regulating piece 23b bulges out in an arc shape.

  -As shown to Fig.7 (a), each auxiliary | assistant regulation piece 27b of the auxiliary | assistant ring 27 can also be formed in a pentagonal plate shape. As shown in FIG. 7B, the auxiliary restricting pieces 27b of the auxiliary ring 27 may be configured such that a pentagonal plate shape and a trapezoidal plate shape are alternately positioned in the circumferential direction. As shown in FIG. 7C, the auxiliary restricting piece 27b of the auxiliary ring 27 may be formed in a trapezoidal plate shape so that the inner peripheral edge thereof extends in an arc shape parallel to the inner peripheral edge of the auxiliary base ring 27a. As shown in FIG. 7 (d), the auxiliary restricting piece 27b of the auxiliary ring 27 can be formed in a substantially trapezoidal plate shape as in the embodiment, and a cut portion 32 can be provided in one place so that the diameter can be reduced. .

  -The retaining ring 23 having the pentagonal plate-shaped regulating piece 23b shown in the embodiment and the auxiliary ring 27 shown in FIG. 7A can be combined and arranged. In that case, the restriction piece 23b and the auxiliary restriction piece 27b are rotated in the circumferential direction by a half width of the restriction piece 23b or the auxiliary restriction piece 27b as shown in FIG. Alternatively, the restricting pieces 23b and the auxiliary restricting pieces 27b can be arranged in the circumferential direction as shown in FIG. 8B. In the case of FIG. 8A, one restriction piece 23b is supported by two adjacent auxiliary restriction pieces 27b. In the case of FIG. 8B, one restriction piece 23b is supported by one auxiliary restriction piece 27b. The restricting piece 23b and the auxiliary restricting piece 27b can be arranged by being rotated in the circumferential direction by an arbitrary width such as 1/3 or 1/4 of the restricting piece 23b or the auxiliary restricting piece 27b.

The thickness of the retaining ring 23 and the auxiliary ring 27 may be the same, and the material may be set so that the auxiliary ring 27 has higher rigidity than the retaining ring 23.
The base ring 23a of the retaining ring 23 and the auxiliary base ring 27a of the auxiliary ring 27 can be integrated by bonding with an adhesive.

  The guide tube portion 14 may be omitted, and an annular groove may be provided on the inner peripheral portion of the body cylinder body 17 facing the pipe insertion space 26, and a seal ring may be fitted into the annular groove.

The joint body 12 and the barrel body 17 can be integrally formed.
The guide tube portion 14 may be configured separately from the joint body 12 and may be configured to be screwed with a screw.

A sealing material can also be attached to the threaded portion between the male screw 18 of the joint body 12 and the female screw 19 of the body cylinder body 17.
The number of the seal ring 29 may be one or three or more, or the confirmation hole 31 may be omitted.

  ・ Although water was circulated through the joint 10 and the pipe 11, hot water was circulated by connecting the joint 10 to a hot water pipe, and oil, ethylene glycol, etc. were circulated for floor heating and load heating. May be.

Furthermore, the technical idea grasped from the embodiment will be described below.
In the joint body, there is a guide tube portion on which a pipe is fitted, and at the tip of the guide tube portion, the inner peripheral surface of the pipe is pressed to cooperate with the retaining ring and the auxiliary ring. The joint according to any one of claims 1 to 3, further comprising a flange portion for preventing the pipe from coming off. In this case, in addition to the effects of the invention according to any one of claims 1 to 3, the retaining ring and the auxiliary ring press the pipe from the outer peripheral portion and tighten the pipe, and the flange portion of the guide cylinder portion is piped by the pressing force. Since the pipe is pressed and tightened from the inner peripheral portion, the effect of preventing the pipe from coming off can be further improved.

  The auxiliary restriction piece of the auxiliary ring is configured to be able to bite into the pipe when a pulling force is applied to the connected pipe. Fittings. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-3, the removal prevention effect of a pipe can be improved.

The half longitudinal cross-sectional view which shows the state before inserting a pipe in the coupling of embodiment. The disassembled perspective view which shows a retaining ring and an auxiliary ring. (A) is a half sectional view showing a retaining ring of the embodiment, (b) is a front view showing the retaining ring. (A) is a half sectional view showing the auxiliary ring of the embodiment, (b) is a front view showing the auxiliary ring. (A)-(c) is a figure which shows the effect | action of embodiment, (a) is a fragmentary sectional view which shows the state which inserted the pipe in the coupling, (b) is the state which pulls out the pipe inserted in the coupling. The fragmentary sectional view which shows, (c) the partial sectional view which shows the state where the pipe which is inserted in the joint is pulled out strongly. The front view which shows another example of a retaining ring. (A)-(d) is a front view which shows another example of an auxiliary | assistant ring. (A) And (b) is a front view which shows the arrangement | positioning seen from the axial direction of the retaining ring and an auxiliary | assistant ring.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Pipe, 12 ... Joint main body, 17 ... Body cylinder which comprises joint main body, 21 ... Clamping nut which comprises joint main body, 23 ... Retaining ring, 23a ... Base ring, 23b ... Restriction piece 27 ... auxiliary ring, 27a ... auxiliary base ring, 27b ... auxiliary regulating piece.

Claims (4)

In a joint with a retaining ring that reduces the diameter when the pulling force acts on the pipe inserted into the joint body and bites into the pipe to restrict the pipe from being pulled out.
The retaining ring includes an annular base ring and a restricting piece extending from the inner periphery of the base ring so as to incline in the pipe insertion direction, and the annular auxiliary base ring and the auxiliary base ring. An auxiliary ring having an auxiliary restricting piece extending incline in the pipe insertion direction from the inner periphery of the pipe is arranged side by side on the pipe insertion side of the retaining ring, and the inclination of the restricting piece due to the pulling force applied to the pipe And the auxiliary restricting piece is configured to grasp the pipe and restrict the withdrawal in an auxiliary manner. The joint according to claim 1, wherein an inner diameter of the auxiliary ring is set larger than an inner diameter of the retaining ring. The joint according to claim 1 or 2, wherein an inner diameter of the auxiliary ring is set larger than an outer diameter of the pipe. The joint according to any one of claims 1 to 3, wherein a rigidity of the auxiliary ring is set to be larger than a thickness of the retaining ring to increase rigidity.

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