JP2004116570A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint whereby female side joints can be easily and surely connected to each other. <P>SOLUTION: This joint 11 is in a shape of a cylinder, and is constituted by a pair of the female side joints 13 having an insertion hole 12 therein, and an inside joint 14 inserted into the insertion hole 12 of the female side joints 13. A flange 16 is protrudingly formed on a tip of both of the female joints 13, and outer end surfaces 18 of the flanges 16 are abutted to each other. A quick fastener 32 is attached on abutting parts of both of the flanges 16, and both of the female side joints 13 are connected to each other. At this time, chamfering part 21 on a tip part inner peripheral surface of the female side joint 13 and a fitting protrusion 26 on a central part outer peripheral surface of the inside joint 14 are fitted to each other, and thereby movement of the inside joint 14 is regulated. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a pipe joint used for water pipes, hot water pipes, floor heating, road heating, and the like.
[0002]
[Prior art]
Conventionally, a joint has been used to connect a pipe made of crosslinked polyethylene or polybutene to, for example, a water supply pipe. The following is known as this kind of joint (for example, refer to Patent Document 1). That is, it is a type configured by inserting one end of a male side joint into a female side joint and connecting two joints. The female joint has an insertion hole formed in the center and a flange protruding from the outer peripheral surface of the base end. Further, a flange is provided on the outer peripheral surface of the intermediate portion of the male joint, and a projecting portion to be inserted into the insertion hole of the female joint is provided on the distal end side of the flange. An annular groove is provided around the projecting portion, and a seal member is fitted in the annular groove.
[0003]
Then, in order to connect the female joint and the male joint, first, insert the protrusion of the male joint into the insertion hole of the female joint, butt the flange provided on each joint, and then connect to this butt portion. Attach the members.
[0004]
As a result, the female joint and the male joint are connected by the connecting member, and the seal member seals between the inner peripheral surface of the base end portion of the female joint and the outer peripheral surface of the protrusion of the male joint.
[0005]
[Patent Document 1]
JP-A-2000-65260 (pages 3 and 4, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, when connecting the female joints depending on the application, an inner joint that is inserted between the female joints and supports both the female joints is required. In this case, there is a problem that if the inner joint is simply inserted into the both female joints, the inner joint may move in the both female joints.
[0007]
The present invention has been made by paying attention to the problems existing in the prior art as described above. An object of the present invention is to provide a joint that can easily and surely connect the female joints.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the joint according to the first aspect of the present invention is a pair of female joints having a tubular shape, an insertion hole is formed therein, and a flange is protruded at one end. And an inner joint that is inserted into the insertion hole with these female joints abutted on both flanges. A coupling member is attached to the abutted flanges to connect a pair of female joints, A movement restricting portion for restricting movement of the inner joint is provided between the side joint and the inner joint.
[0009]
In the joint according to the second aspect of the present invention, in the first aspect, the connecting member is formed in an arc shape having an opening by bending a metal plate, and the elastic force of the connecting member causes the female member to move from the opening. It is a quick fastener which is mounted on a flange of a side joint and has a holding hole for holding both butted flanges.
[0010]
A joint according to a third aspect of the present invention is the joint according to the first or second aspect, wherein the female-side joint has a chamfered portion on an inner peripheral surface on a flange side and an outer peripheral surface on an inner joint. It is characterized in that an engagement protrusion is provided for engaging with the chamfered portion, and the movement restricting portion is constituted by the chamfered portion and the engagement protrusion.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the joint 11 is composed of a pair of female joints 13 having an insertion hole 12 and an inner joint 14 inserted into the insertion hole 12 of the female joint 13.
[0012]
First, the female joint 13 will be described. A male screw portion 15 is threaded on the outer peripheral surface of the proximal end portion of the female joint 13 having a cylindrical shape, and can be screwed to a pipe such as a water supply pipe (not shown). A flange 16 protrudes from the outer peripheral surface of the distal end portion of the female joint 13, and an annular groove 17 is provided on the base end side of the flange 16. The outer end face 18 of the flange 16 is formed in a flat shape for joining with the flange 16 of the other female joint 13. On the inner peripheral surface of the female joint 13, an inner joint accommodating portion 20 is formed from the step portion 19 where the inner diameter at the distal end is larger than the inner diameter at the proximal end to the distal end. On the inner peripheral surface of the distal end portion of the female joint 13, there is provided a chamfered portion 21 whose diameter is reduced from the distal end edge toward the inside in the axial direction of the female joint 13. As shown in the enlarged cross-sectional view of FIG. 3, the chamfered portion 21 has an intermediate portion formed on an inclined surface 23 inclined by 30 ° with respect to the axis 22 of the inner joint 14, and both ends formed on an arc surface 24. I have.
[0013]
The inner joint 14 has a substantially cylindrical shape, and has a through hole 25 formed therethrough. On the outer peripheral surface of the central portion of the inner joint 14, a mountain-shaped engaging projection 26 projecting in the radial direction of the inner joint 14 is provided. The top surface 27 of the engagement projection 26 is formed flat, and the inclination angle of the inclined surfaces 28 on both sides thereof is formed to be the same as the inclination angle of the inclined surface 23 of the chamfer 21. The chamfered portion 21 of the female joint 13 and the engagement protrusion 26 of the inner joint 14 constitute a movement restricting portion that restricts the movement of the inner joint 14 in the axial direction.
[0014]
When the inner joint 14 is inserted into the insertion hole 12 of the female joint 13, the inclined surface 28 of the engagement projection 26 of the inner joint 14 comes into close contact with the inclined surface 23 of the chamfered portion 21 of the female joint 13, The movement of the inner joint 14 is restricted. The protrusion height of the engagement protrusion 26, specifically, the height from the outer peripheral surface of the inner joint 14 to the top surface 27 is formed to be approximately half the opening height of the chamfered portion 21 of the female joint 13. ing.
[0015]
As shown in FIGS. 1 and 4, the length in the axial direction from the engagement protrusion 26 to the end face 29 is set shorter than the length in the axial direction of the inner joint housing portion 20 of the female joint 13. The inner diameter of the inner joint 14 is formed slightly smaller than the inner diameter of the proximal end of the female joint 13.
[0016]
Two pairs of accommodation grooves 30 are circumferentially recessed at symmetrical positions on both left and right sides of the engagement projection 26, and a seal ring 31 made of a rubber material and having an elliptical cross section is fitted in each accommodation groove 30. Is being worn. When the inner joint 14 is inserted into the pair of female joints 13, the outer peripheral surfaces of the seal rings 31 are closely contacted with the inner peripheral surface of the female joint 13, respectively. And the inner peripheral surface of the female joint 13 is sealed.
[0017]
As shown in FIG. 1, the pair of female joints 13 are connected by mounting a quick fastener 32 as a connecting member with the outer end surfaces 18 of the flanges 16 abutting each other. As shown in FIGS. 2A and 2B, the quick fastener 32 is formed in an arc shape having an opening between its distal ends by bending a plate made of a metal material having spring properties symmetrically. . A hinge portion 33 is bent at the center of the quick fastener 32 so as to have a U-shaped cross section, and guide portions 34 are formed at both open end portions so as to extend outward. In addition, holding holes 36 are provided in both side walls 35 of the quick fastener 32.
[0018]
Then, in a state where the flanges 16 of the female joints 13 abut against each other, the quick fastener 32 is attached from the guide portion 34 side so that the two flanges 16 are clamped in the clamping holes 36 of the quick fastener 32. . The width of the two flanges 16 is set substantially equal to the interval between the inner walls 37 forming the holding holes 36, and the two flanges 16 are connected and fixed by the quick fastener 32.
[0019]
Next, the operation of the joint 11 will be described below.
When connecting the female joints 13, first, as shown in FIG. 4, one end (the left end in FIG. 4) of the inner joint 14 is inserted into the insertion hole 12 of the female joint 13. At this time, the chamfered portion 21 of the female joint 13 serves as an insertion guide of the inner joint 14, and the inclined surface 23 of the chamfered portion 21 of the female joint 13 and the inclined surface 28 of the engagement protrusion 26 of the inner joint 14 are formed. Insert the inner joint 14 into the inner joint housing 20 until it engages. Next, the insertion hole 12 of the female joint 13 different from the above is inserted into the other end (the right end in FIG. 4) of the inner joint 14 that is not inserted into the female joint 13. Also in this case, the chamfered portion 21 serves as an insertion guide for the inner joint 14, and the inclined surface 23 of the chamfered portion 21 of the female joint 13 and the inclined surface 28 of the engagement protrusion 26 of the inner joint 14 are engaged. The female joint 13 is inserted until it fits, and the inner joint 14 is inserted into the inner joint housing 20. At this time, the outer end surfaces 18 of both flanges 16 abut each other.
[0020]
When the outer end surfaces 18 of the flanges 16 of the female joints 13 abut against each other and the chamfered portion 21 and the engaging projections 26 provided on the inner joint 14 are engaged, the two pairs of seal rings 31 The space between the inner peripheral surface of the side joint 13 and the outer peripheral surface of the inner joint 14 is sealed. At this time, as shown in FIG. 3, since the inclination angle of the inclined surface 23 of the chamfered portion 21 and the inclination angle of the inclined surface 28 of the engagement projection 26 are the same, the chamfered portion 21 and the engagement projection 26 Adhering. Therefore, the movement of the inner joint 14 within the pair of female joints 13 is restricted.
[0021]
Subsequently, as shown in FIG. 4, when the quick fastener 32 is mounted on the butted portion of the flange 16, the opening of the quick fastener 32 is pressed against the butted portion of the flange 16 from above. Then, the opening of the quick fastener 32 is expanded by the elastic force, and when the quick fastener 32 is further pushed downward, the distal ends of the pair of female joints 13 are held inside the quick fastener 32.
[0022]
Then, the quick fastener 32 pushed downward returns to its original shape due to its elastic force, and the side walls 35 are respectively accommodated in the respective annular grooves 17 of the female joint 13 and the holding holes 36 are formed. The pair of flanges 16 are fitted into the holding holes 36 in contact with the inner side wall 37. In this state, the base ends of the pair of female joints 13 are included inside the quick fastener 32, and the pair of flanges 16 are clamped in the clamping holes 36, thereby controlling the detachment of the female joint 13. Therefore, the female fasteners 13 can be connected to each other by pressing the quick fastener 32 against the flanges 16 of the pair of female-side joints 13 and pressing them.
[0023]
The effects exerted by the above embodiment will be described below.
The joint 11 of the present embodiment is mounted by a one-touch operation of pushing in from above the butted portion of the flanges 16 of both female joints 13 by using the elasticity of the quick fastener 32. For this reason, the connection between the female side joints 13 can be easily performed. In addition, the quick fastener 32 attached to both female joints 13 tightens each annular groove 17 of the female joint 13 by its elastic force. Therefore, the connection between the female joints 13 can be reliably performed.
[0024]
Further, the flanges 16 of the female joints 13 are fitted into and sandwiched in a state where the flanges 16 of the female-side joints 13 are in contact with the inner side walls 37 forming the holding holes 36 provided in the both side walls 35 of the quick fastener 32. . Therefore, the connection of the pair of female joints 13 can be performed more firmly by the quick fastener 32.
[0025]
In addition, the engagement protrusion 26 provided on the inner joint 14 engages with the chamfered portion 21 provided on the female joint 13 and plays a role in regulating the movement of the inner joint 14. For this reason, displacement and rattling of the inner joint 14 within the female joints 13 are suppressed.
[0026]
On the outer peripheral surface of the inner joint 14, two pairs of seal rings 31 are fitted on both sides of the engagement protrusion 26. Therefore, the space between the outer peripheral surface of the inner joint 14 and the inner peripheral surface of the female joint 13 is tightly sealed, and it is possible to effectively prevent the occurrence of water leakage from the inside of the joint 11, and at the same time, the female joint The rattling of the inner joint 14 in the inside 13 can be suppressed.
[0027]
This embodiment can be embodied with the following modifications.
As shown in FIG. 5, a configuration may be adopted in which a step portion 19 provided on the inner peripheral surface of the female joint 13 and the both end surfaces 29 of the inner joint 14 abut as the movement restricting portion. In such a configuration, the inner joint 14 inserted into the inner joint accommodating portion 20 of the pair of female joints 13 is completely moved and regulated at both end surfaces 29 by the step portion 19, so that the inner joint 14 can be stably formed. In addition to holding, the displacement and rattling can be suppressed.
[0028]
A fastener that allows a pair of semicircular members to be opened and closed by a hinge and that fixes an open end thereof with a screw or the like may be used as the connecting member.
Further, as the movement restricting portion, in addition to the configuration of the above-described embodiment, a configuration in which the step portion 19 provided on the inner peripheral surface of the female joint 13 and the both end surfaces 29 of the inner joint 14 as described above abuts. May be adopted. With such a configuration, the inner joint 14 inserted into the inner joint accommodating portions 20 of the pair of female joints 13 can be held more stably.
[0029]
-In the joint 11 of this embodiment, the engagement projection 26 of the inner joint 14 may be provided on at least a part of the outer peripheral surface thereof. Even in the case of such a configuration, it is possible to suppress displacement and rattling of the inserted inner joint 14.
[0030]
The inclination angle of the inclined surface 23 of the chamfered portion 21 of the flange 16 and the inclination angle of the inclined surface 28 of the engagement projection 26 of the inner joint 14 may be changed to, for example, 20 °, 40 °, or the like.
[0031]
In the joint 11 of the present embodiment, the top surface 27 of the engagement projection 26 of the inner joint 14 may be changed to a gently bulging curved surface or a shape processed into a mountain shape.
The joint 11 of the present embodiment is more effective when used to connect the trunk pipes of the header composed of the trunk pipe and the branch pipe. In this case, for the header, for example, a tube material obtained by continuous casting using a mandrel using bronze as a raw material is cut into a predetermined length, and the vicinity of the end is cut to form flanges 16 (female joints) at both ends. Thereby, the inner diameter can be made large and thin. On the other hand, if one end of the header is formed by the flange 16 (female side joint) and the other end is formed by the flange (male side joint), the inner diameter is small and only the thick part can be manufactured, which increases the cost. Therefore, a plurality of inexpensive headers can be easily connected and used by providing flanges 16 at both ends of the header to form female joints at both ends, inserting the inner joint 14 and connecting the flanges 16 with the quick fasteners 32. Can be used, good usability.
[0032]
Further, technical ideas that can be grasped from the embodiment will be described below.
-The chamfered portion is provided with an inclined surface having a fixed inclination angle, the engaging projection is provided with an inclined surface engaging with the inclined surface, and the inclination angle of the inclined surface and the inclination angle of the inclined surface. 4. The joint according to claim 3, wherein? According to this configuration, the contact area between the chamfered portion and the engagement protrusion can be ensured, and the displacement and rattling of the inner joint inserted into the pair of female joints can be stably suppressed.
[0033]
The joint according to claim 3, wherein the engagement protrusion is provided over the entire outer peripheral surface of the inner joint. According to this configuration, the movement restricting portion constituted by the engaging protrusion and the chamfered portion works most effectively, and effectively suppresses the displacement and the rattling of the inner joint inserted into the pair of female joints. be able to.
[0034]
The joint according to claim 3, wherein the engagement protrusion is provided on a central outer peripheral surface of the inner joint. According to this configuration, the balance on both sides of the inner joint after the insertion can be stably maintained, and rattling in the pair of female joints can be suppressed.
[0035]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
According to the joint according to the first aspect of the invention, the female joints can be easily and reliably connected to each other.
[0036]
According to the joint of the invention described in claim 2, in addition to the effect of the invention described in claim 1, the connection between the female-side joints can be performed more firmly.
According to the joint of the third aspect of the invention, in addition to the effects of the first or second aspect, the displacement and the rattling of the inner joint inserted between the pair of female joints are suppressed. can do.
[Brief description of the drawings]
FIG. 1 is a side sectional view showing a joint according to an embodiment.
2A is a perspective view showing a quick fastener, and FIG. 2B is a cross-sectional view taken along line 2b-2b in FIG. 2A.
FIG. 3 is an enlarged sectional view showing a movement restricting portion of the joint.
FIG. 4 is an exploded side sectional view showing a joint.
FIG. 5 is a side sectional view showing another example of a joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Joint, 12 ... Insertion hole, 13 ... Female side joint, 14 ... Inner joint, 16 ... Flange, 21 ... Chamfer part which comprises a movement restriction part, 26 ... Engagement protrusion which comprises a movement restriction part, 32 ... Connection Quick fastener as a member, 36 ... clamping holes.

Claims (3)

A pair of female joints having a cylindrical shape and an insertion hole formed therein and having a flange protruding at one end thereof, and these female joints are inserted into the insertion hole with both flanges abutting each other. Inner joint,
A coupling member is attached to both butted flanges to couple the pair of female joints, and a movement restricting portion that regulates movement of the inner joint is provided between the female joint and the inner joint. Fittings. The connecting member is formed in an arc shape having an opening by bending a metal plate, and is attached to the flange of the female side joint from the opening by its elastic force, and clamps the butted flanges. The joint according to claim 1, which is a quick fastener having a hole. A chamfered portion is provided on the inner peripheral surface on the flange side of the female joint, and an engaging projection is provided on the outer peripheral surface of the inner joint to engage with the chamfered portion. The joint according to claim 1 or 2, wherein:

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