JPH05263973A - Pipe joint - Google Patents

Abstract

PURPOSE:To provide a pipe joint that is able to easily expand the caliber of an islip preventing device installed in such a pipe joint as connectible by only inserting a spigot thereinto. CONSTITUTION:A recess 2 is formed over the whole circumference of an inner circumferential surface of a socket 3, while an insert hole 4, piercing through from an opening to the recess 2, is installed there, and the position of a notch 6 in an islip preventing device 5 is adjusted onto an extension line of the insert hole 4 and loosely inserted into the recess 2. When a spigot is inserted in or pulled out, a diametral expanding jig is inserted into the insert hole 4, so a tip of this diametral expanding jig is surely inserted in the notch 6, through which the islip preventing device 5 is constituted so as to expand its diameter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for piping such as a water pipe, and in particular, it is possible to simply insert an insertion port of one pipe to be connected into a receiving port of the other pipe. The present invention relates to a pipe joint that can connect an insertion port and a receiving port and that can be easily pulled out by a dedicated jig even after once connected.

[0002]

2. Description of the Related Art A pipe joint used for piping such as a water pipe, in which an internal retainer works only by inserting an insertion port of one pipe to be connected into a receiving port of the other pipe. There has been proposed a pipe joint configured so that the insertion port and the receiving port are connected to each other. An example of a pipe fitting provided with such a retaining device is disclosed in Japanese Utility Model Laid-Open No. 51-152120, JP-A-1-247.
No. 889, Japanese Patent Application Laid-Open No. 2-240492, etc., and an example thereof is shown in FIG.

In FIG. 15, a plurality of hooking portions 102, each of which projects along the axial direction, are formed on the inner peripheral surface of the retainer 101. And this retainer 10
In No. 1, a cutout 103 is provided in part so that the diameter can be reduced and the diameter can be increased. The inner diameter thereof is generally designed to be smaller than the outer diameter of the insertion port tube in order to obtain the initial tightening force with the insertion port 104 inserted.

The end portion of the insertion port 104 to be connected is
Pre-chamfered for easy insertion into the retainer. On the inner peripheral surface of the receiving port 105 into which the insertion port 104 to be connected is inserted, the maximum inner diameter is about the outer diameter of the retainer 101 with the insertion port 104 inserted, and it gradually increases toward the opening side. A recess 106 having a tapered surface with a reduced diameter is provided, and the retaining member 101 is loosely inserted in the recess 106. The general shape of the retainer 101 is shown in FIG.

As shown in FIG. 17, the insertion port 104 inserted into the receiving port 105 having such a structure is provided with the retaining member 101.
Is expanded and enters and is connected to the receiving port 105. When a force in the pulling direction is applied in such a connected state, as shown in FIG. 18, the retainer 101 externally fitted to the insertion opening 104 is brought into the insertion opening 104 and the recess 106. Move to the opening side inside. Then, the retainer 101 is reduced in diameter by the tapered surface of the recess 106,
Since the hooking portion 102 formed on the inner peripheral surface strongly hooks the outer peripheral surface of the insertion opening 104, a detachment preventing force against the force in the detaching direction is generated and the detaching is prevented.

In the pipe joint having the above structure, when the once connected insertion port 104 is to be detached from the pipe joint due to a design change or the like, the pipe joint is cut or destroyed to be detached, or a special expansion for extraction is used. Insert the diameter jig from the gap of the receiving port, and insert the tip of the diameter expansion jig into the notch 103 to expand the retaining device 101 and insert it into the insertion port 104.
The insertion port 104 is pulled out from the surface of the plug.

The tip end of the expanding jig has the cutout portion.
It is formed in a plate shape having a width such that the inside diameter of the retainer 101 can be slightly larger than the outside diameter of the insertion port 104 when inserted into 103.

However, in the pipe joint having the construction shown in FIGS. 15 to 18, the position of the notch 103 of the retainer 101 is unknown from the outside when the diameter-expanding jig is inserted. Without trial and error, the tip of the diameter-expanding jig could not be inserted into the notch 103. As described above, if the diameter-expanding jig is repeatedly inserted and removed, there is a problem that the retaining device 101 cannot obtain the intended retaining effect in a short period of time due to damage or the like.

Therefore, an example of a dedicated diameter expanding jig for expanding the diameter of the retaining member 101 without damaging it is disclosed in JP-A-3-264.
No. 272. This is a rod-shaped diameter-expanding member that is inserted between the receiving opening and the insertion opening of the receiving opening and that can enter the space between the retaining member and the insertion opening in the receiving opening to expand the retaining device. Is a jig for arranging a plurality of around the entire circumference of the insertion opening. That is, this is a strip-shaped body which is wound around an insertion opening, and a rod-shaped expanding member is inserted into each of a plurality of insertion portions provided in the strip-shaped body, and the retaining device is expanded by the plurality of rod-shaped rigid bodies. , Is designed to be detached from the surface of the insertion slot.

[0010]

However, even if this dedicated diameter-expanding jig is used, the hooked portion of the retainer is apt to be damaged by the rigid body in the shape of a bar with a sharp tip, and the work is difficult. There is a problem that it is troublesome and there is a large resistance to insertion due to friction between the insertion port and the retaining device when inserting the insertion port.

Further, since it is necessary to chamfer the end face of the insertion opening in advance, there is a problem that workability is not good.

Therefore, according to the present invention, even if the end face of the insertion opening is not chamfered, it can be inserted without resistance, and the insertion opening once connected can be easily pulled out without damaging the retainer. The purpose is to provide a pipe joint.

[0013]

In the pipe joint according to the present invention, the diameter of the insertion opening to be connected is gradually reduced on the inner peripheral surface of the receiving opening into which the opening is located. It has a cylindrical shape with a concave portion having a tapered surface, and a cutout portion of a predetermined width is partially provided in the concave portion, and the diameter expansion and contraction has a hook portion for the outer peripheral surface of the insertion port on the inner peripheral surface. In a pipe joint configured to loosely insert a retaining device having a diameter that can be expanded by expanding the notch portion by a diameter-expanding jig inserted from the opening, A seal member for sealing between the outer peripheral surface and the inner peripheral surface of the receiving opening is provided on the inner peripheral surface deeper than the recess, and an insertion hole for inserting the diameter expanding jig is provided from the opening. Extend to the recess and extend the notch of the retaining device to the insertion hole. It took measures that loosely inserted in accordance with the above.

Further, a seal member for sealing between the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening is provided on the inner peripheral surface deeper than the recess, and the insertion member for inserting the diameter expanding jig. An insertion hole is formed so as to extend from the opening to the recess, and a projection projecting in the axial direction is provided in a part of the recess on the extension line of the insertion hole. The width may be formed to be slightly smaller than the width of the cutout portion in a state where the insertion opening is inserted, and the retaining device may be loosely inserted so that the protrusion is located in the cutout portion.

Further, a concave portion having a tapered surface whose diameter is gradually reduced toward the opening side is provided on the inner peripheral surface of the receiving opening into which the insertion opening to be connected is inserted from the opening, and the concave portion,
It has a cylindrical shape with a notch of a specified width in part,
In order to be able to expand the diameter of the retaining device by loosely inserting the retaining device that has a hooking portion for the outer peripheral surface of the insertion port on the inner peripheral surface and is capable of expanding and contracting the diameter and pushing the notch In the constructed pipe joint, a diameter-expansion jig whose width can be freely expanded / reduced is disposed in a notch portion of a retaining device loosely inserted in the recess, and an expansion / contraction operation means for expanding / contracting the diameter expansion jig. To
It may be provided on the outer side of the pipe joint.

[0016]

According to the pipe joint of the present invention having the above-mentioned structure, the notch of the retaining member is loosely inserted into the concave portion so as to be aligned with the position on the extension line of the insertion hole. To
When inserted into the insertion hole from the opening of the pipe joint, the tip of the diameter-expanding jig is inserted into the cutout portion of the retainer, and the width of the notch is expanded to expand the retainer. Expand the diameter.

When the diameter of the retainer is expanded in this way, the insertion opening can be inserted without resistance, and the insertion opening once inserted can be easily removed. Since the seal member for sealing between the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening is provided on the side opposite to the opening with respect to the recess, that is, on the inner peripheral surface further in the back, the sealing effect is sufficient. can get.

Further, since the projection is provided in a part of the recess on the extension line of the insertion hole, and the retainer is loosely inserted so that the protrusion is located in the notch, the retainer is recessed. It is prevented to move and shift in the circumferential direction.
Therefore, when a dedicated diameter-expanding jig is inserted into the insertion hole, the tip of the diameter-expanding jig is surely inserted into the cutout portion of the retainer, and the width of the cutout portion is expanded. Expand the retaining device.

In this way, like the above, the insertion and removal of the insertion opening can be performed reliably and easily.

Further, since a diameter-expanding jig whose width can be freely expanded / reduced is arranged in the space of the notch of the retaining member which is loosely inserted in the concave portion of the inner peripheral surface of the pipe joint, it is arranged outside the pipe joint. When the width of the diameter expansion jig is expanded by the expansion / contraction operation means provided, the width of the notch portion is expanded, and the retaining device is expanded in diameter. Therefore,
The insertion and removal of the insertion port can be easily done. When the width of the diameter-expanding jig is narrowed by the expansion / contraction operation means, the width of the notch portion is narrowed and the retainer is reduced in diameter. Therefore, the surface of the insertion opening is hooked by the hooking portion provided on the slip-out preventing member, and is prevented from slipping out even if a force in the slip-out direction is applied.

[0021]

【Example】

[Embodiment 1] Hereinafter, Embodiment 1 of the pipe joint of the present invention will be described in detail with reference to the drawings. 1 is a front view of an essential part of a pipe joint according to a first embodiment of the present invention, FIG. 2 is a side sectional view of an essential part of the pipe joint, FIG. 3 is a side view of a retaining member used in the pipe joint, and FIG.
Is a front view for explaining a state in which a diameter-expanding jig is inserted in the pipe joint, and FIG. 5 is a side sectional view of an essential part for explaining a state in which the diameter-expanding jig for the pipe joint is inserted and an insertion port is inserted. FIG. 6 is a side view of the retaining member used for the pipe joint in a diameter-expanded state, FIG. 7 is a side sectional view of an essential part for explaining a state in which the insertion port is inserted and connected to the pipe joint, and FIG. 8 is the pipe joint. FIG. 4 is a side sectional view of a main part for explaining a state in which the diameter expanding jig is inserted and the insertion opening is removed.

First, a description will be given with reference to FIGS. Reference numeral 1 is a pipe joint of the first embodiment, 2 is a concave portion formed over the entire circumference of the inner peripheral surface of the receiving port 3, and a tapered surface whose diameter is gradually reduced toward the opening side is formed. Reference numeral 4 is an insertion hole that penetrates from the opening side of the receiving port 3 to the recess 2. Reference numeral 5 denotes a retainer loosely inserted in the recess 2,
It is formed in a cylindrical shape in which a notch 6 of a predetermined width is provided in part, and a convex locking portion 11 is formed on the inner peripheral surface so as to lock the outer peripheral surface of the insertion port to be connected. .. When the retainer 5 is loosely inserted into the recess 2, the notch 6 is loosely inserted so as to coincide with the central axis of the insertion hole 4.
At this time, as shown in FIG. 1, the notch 6 is visible from the outside of the pipe joint using the insertion hole 4 as a window.

Reference numeral 8 is a rubber seal member, for example. In order to obtain the effect of the seal member 8, it is necessary to dispose the seal member 8 further deeper than the retainer 5 unlike the position in the conventional pipe joint.

In the pipe joint having the above-described structure, as shown in FIGS. 1 and 3, the width RH of the notch 6 of the retainer 5 in the free state before connecting the insertion port is narrow, and the retainer 5 Has a reduced diameter, so its inner diameter is smaller than the outer diameter of the insertion port. In this state, as shown in FIG. 4, when a plate-shaped diameter-expanding jig 7 having a predetermined width H is inserted into the insertion hole 4, as shown in FIG. The tip end of the jig 7 pushes the notch 6 of the retainer 5 into the width H and enters it.

The expansion of the notch 6 expands the diameter of the retaining member 5 to have an inner diameter slightly larger than the outer diameter of the insertion opening.

In this way, as shown in FIG. 5, since the insertion opening 10 can be inserted with the retaining member 5 expanded in diameter, it is not necessary to chamfer the end portion of the insertion opening 10. And the effect that the insertion can be smoothly performed without receiving the resistance due to the inner surface of the retainer 5. When it is inserted deeper, as shown in Fig. 7,
The insertion port 10 is fitted to a seal member 8 disposed deeper than the retainer 5 and is sealed so that the fluid inside the pipe does not leak outside the pipe. After the insertion is completed, the diameter expanding jig 7 is removed.

As described above, if the insertion opening 10 is inserted to a predetermined depth, even if a force in the pulling direction is applied, as in the conventional case,
The detachment preventing member 5 and the tapered surface of the recessed portion 2 generate a detachment preventing force against the force in the detaching direction due to the diameter reducing action, and the insertion opening 10
Is prevented from coming off.

The insertion port 10 that is securely connected in this way is
The work for pulling out due to circumstances such as design changes will be described below. The diameter expansion jig 7 is inserted into the insertion hole 4 of the pipe joint to expand the width of the cutout portion 6 of the retainer 5, thereby expanding the retainer 5. Then, the retaining portion on the inner surface of the retainer 5 separates from the outer peripheral surface of the insertion opening 10, so that the retaining force of the retainer 5 disappears. In this way, the insertion opening 10 can be easily pulled out from the receiving opening 3.

In this way, according to this pipe joint 1,
Since the diameter-expanding jig 7 can be reliably inserted into the notch 6 of the retaining device 5, the retaining device 5 can be expanded in diameter without being damaged and the insertion opening 10 can be easily pulled out. .. The diameter expanding jig 7 may be a simple plate-shaped one. Therefore, when the once-inserted insertion port 10 is pulled out, there is an effect that the diameter can be expanded and easily pulled out without damaging the retainer.

The shape of the insertion hole 4 is not limited to the U-shaped groove shape as shown in the drawing, but it is sufficient that the insertion hole 4 penetrates from the outside of the pipe joint to the recess 2.
Further, the seal member 8 is not limited to rubber and may have a structure of sealing the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening by electric fusion or adhesion.

[Embodiment 2] FIG. 9 is a front view of a main portion of a pipe joint according to Embodiment 2. In the second embodiment, in addition to the same structure as in the first embodiment, a protrusion 9 is provided on an extension line of the insertion hole 4 and in a part of the recess 2. The retainer 5 is loosely inserted so that the protrusion 9 is located between the notches 6 of the retainer 5. Note that the configuration of the seal member and the like is similar to that of the first embodiment, and therefore the description thereof is omitted.

According to the above construction, the projection 9 prevents the stopper 5 from moving in the recess 2 in the circumferential direction.
The notch 6 of the retainer 5 does not shift from the position of the insertion hole 4. Therefore, as shown in FIG. 10, if a diameter-expanding jig 12 having a shape in which the tip portion is bifurcated with the width of the projection 9 is inserted into the insertion hole 4, the tip end of the diameter-expanding jig 12 is inserted. Is always inserted into the cutout portion 6, and the retaining device 5 can be expanded in diameter.

As described above, according to the pipe joint of the second embodiment, the displacement preventing tool 5 is prevented from being displaced and the diameter expanding jig is prevented.
The effect that the 12 can be surely inserted into the notch 6 is obtained. The cross-sectional shape of the protrusion 9 is not limited to the illustrated shape, and various shapes such as a triangular shape are possible. In any case, any shape may be used as long as it does not hinder the expansion / contraction of the retaining device and does not prevent the insertion of the insertion opening, and that prevents the retaining device 5 from shifting.

[Embodiment 3] In Embodiments 1 and 2 described above, each time the retaining device 5 is expanded in diameter, a dedicated diameter-expanding jig is inserted from the outside. As shown in FIG. 5, the expansion / contraction member 13 provided in the cutout portion 6 and the operation member 14 provided outside the pipe joint may be connected by a shaft penetrating the pipe joint.

That is, the expansion / contraction member 13 has a rectangular shape as shown in FIG. 12, and the notch 6 is not expanded in a state where its longitudinal direction is parallel to the axis of the pipe joint. The retainer 5 is in a state in which its diameter can be reduced. Then, as shown in FIG. 13, when the operation member 14 provided outside is rotated to rotate the expansion / contraction member 13 by 90 degrees, the longitudinal direction thereof becomes perpendicular to the axis of the pipe joint, and the cutout portion 6 is formed. To expand the retaining device 5.

In this way, by expanding / contracting the expansion / contraction member 13 from the outside of the pipe joint, each time the insertion / removal of the insertion port is performed,
There is no need to insert and remove the diameter expansion jig,
It is possible to obtain an effect that the insertion opening can be attached and detached without a resistance simply by rotating the and, and an effect that the retaining device 5 is prevented from moving and shifting. Although the expansion / contraction member has a rectangular shape as an example, it may have an elliptical shape or the like as long as the width is changed by rotation. Furthermore, the operation member 14 may be detachably connected to the expansion / contraction member 13 and attached only when necessary. Further, the expansion / contraction member 13 is not a rigid body but may be one that can be expanded by injecting a fluid from the outside. In any case, it suffices that the width be within the cutout portion 6 and the width thereof can be expanded / contracted by an external operation.

In the third embodiment, if the connection structure between the expansion / contraction member 13 and the operating member 14 is a seal structure, the seal member 8 may be provided in front of the retainer 5.

[0038]

As described above, according to the pipe joint of the present invention,
By providing a hole for inserting the diameter expanding jig, and by expanding the retaining device with the diameter expanding jig inserted into this hole, larger than the outer diameter of the insertion opening, by inserting and removing the insertion opening, There is an effect that the work of inserting / connecting the insertion opening and removing the once connected insertion opening can be smoothly performed without receiving the resistance of the retaining device.

Moreover, since it is not necessary to chamfer the end of the insertion slot, the working efficiency is improved. In addition, since the retaining device is not damaged even if the insertion opening is inserted and removed a plurality of times, it is possible to obtain an effect that the mortality of the retaining device is extended.

By providing a protrusion in the recess for preventing the displacement due to the movement of the retaining device, the expanded diameter expanding jig can be surely inserted into the notch of the retaining device, and the work efficiency can be improved. Is improved.

Then, by performing the expansion / contraction operation of the diameter-expanding jig arranged in the notch portion of the retaining member from the outside, it is possible to obtain each of the above effects without removing and inserting the diameter-expanding jig. The effect is obtained.

[Brief description of drawings]

FIG. 1 is a front view of a main part of a pipe joint according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of a main part of the pipe joint.

FIG. 3 is a side view of a retainer used for the pipe joint.

FIG. 4 is a front view illustrating a state in which a diameter-expanding jig is inserted into the pipe joint.

FIG. 5 is a side sectional view of an essential part for explaining a state in which a diameter-expanding jig of the pipe joint is inserted and an insertion port is inserted.

FIG. 6 is a side view of the retaining member used for the pipe joint in a state of expanded diameter.

FIG. 7 is a side sectional view of an essential part for explaining a state in which an insertion port is inserted and connected to the pipe joint.

FIG. 8 is a side sectional view of an essential part for explaining a state in which a diameter-expanding jig of the pipe joint is inserted and the insertion port is removed.

FIG. 9 is a front view of a main part of a pipe joint according to a second embodiment of the invention.

FIG. 10 is a plan view showing an example of a diameter expansion jig used in the second embodiment.

FIG. 11 is a front sectional view of a main part of a pipe joint according to a third embodiment of the present invention.

FIG. 12 is a side view of the pipe joint.

FIG. 13 is a front sectional view of a main part of the pipe joint.

FIG. 14 is a side view of the pipe joint.

FIG. 15 is a partial cross-sectional side view illustrating a state before connection of a pipe joint of a conventional example.

FIG. 16 is a front sectional view showing an example of a retainer used for a pipe joint.

FIG. 17 is a partial cross-sectional side view illustrating a connected state of a pipe joint of a conventional example.

FIG. 18 is a partial cross-sectional side view illustrating a connected state of a pipe joint of a conventional example.

[Explanation of symbols]

 1 Pipe Joint 2 Recess 3 Receiving Port 4 Insertion Hole 5 Retaining Tool 6 Notch 7 Expanding Jig 8 Sealing Member 9 Protrusion 10 Inserting Port 11 Locking Part 12 Expanding Jig 13 Expanding / Reducing 14 Operating Member

Claims (3)

[Claims] 1. A recess having a tapered surface, the diameter of which is gradually reduced toward the opening, is provided on the inner peripheral surface of the receiving opening into which the insertion opening to be connected is inserted from the opening. It has a cylindrical shape with a notch of a predetermined width, and has a retaining part on the inner peripheral surface that engages the outer peripheral surface of the insertion opening. In a pipe joint configured to expand the cutout portion by expanding the cutout portion by a diameter expansion jig inserted from, between the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening A seal member for sealing is provided on the inner peripheral surface at the back of the recess, and an insertion hole for inserting the diameter-expanding jig is provided from the opening to the recess, and the notch of the retaining device is formed. The pipe joint is characterized in that the portion is loosely inserted along the extension line of the insertion hole. 2. A recess having a tapered surface, the diameter of which is gradually reduced toward the opening, is provided on the inner peripheral surface of the receiving opening into which the insertion opening to be connected is inserted from the opening. It has a cylindrical shape with a notch of a predetermined width, and has a retaining part on the inner peripheral surface that engages the outer peripheral surface of the insertion opening. In a pipe joint configured to expand the cutout portion by expanding the cutout portion by a diameter expansion jig inserted from, between the outer peripheral surface of the insertion opening and the inner peripheral surface of the receiving opening A sealing member for sealing is provided on the inner peripheral surface at the back of the recess, and an insertion hole for inserting the diameter expansion jig is provided from the opening to the recess, on an extension line of the insertion hole. A protrusion projecting in the axial direction is provided in a part of the concave portion of the The width of the stopper is formed to be slightly narrower than the width of the cutout portion in the state where the insertion opening is inserted, and the retainer is loosely inserted so that the protrusion is located in the cutout portion. Pipe fittings. 3. An inner peripheral surface of a receiving opening into which an insertion opening to be connected is inserted through an opening is provided with a recess having a tapered surface whose diameter is gradually reduced toward the opening, and the recess is It has a cylindrical shape with a notched portion of a predetermined width, and has a retaining portion on the inner peripheral surface that engages the outer peripheral surface of the insertion opening. For pipe fittings configured to expand the retaining device by expanding the notch, use a diameter expansion jig whose width can be freely expanded and contracted.
A pipe joint provided with an expansion / contraction operation means, which is disposed in a notch of a retaining member loosely inserted in the recessed portion and expands / contracts the diameter expansion jig, on an outer side of the pipe joint.