JP3257900B2 - Captive fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for preventing separation.

[0002]

2. Description of the Related Art As one type of pipe joint, there is a slip-on type pipe joint. In this slip-on type pipe fitting, a receiving material can be joined to a receiving material by inserting a sealing material inside the receiving material and inserting the opening into the receiving material while compressing the sealing material. The sealing property between the mouth insertion openings can be ensured by the sealing material.

Further, as a slip-on type pipe joint having a detachment preventing function, a lock ring is attached to a lock ring accommodating groove formed on an inner periphery of a receiving port and inserted into the receiving port. It is known that a projection is provided on the outer periphery of the distal end of the insertion opening so as to engage with the lock ring to prevent the insertion opening from being detached from the receiving opening. In the detachment prevention pipe joint having such a configuration, when the insertion port is inserted into the receiving port, the lock ring is temporarily expanded by using the inclined surface formed at the tip of the projection of the insertion port as a guide. The protrusion can pass through the inside of the lock ring toward the inside of the socket.

[0004] In this type of disconnection preventing pipe joint, the inner diameter of the opening end of the receiving port is formed large in order to allow passage of the projection at the tip of the insertion port. For this reason, when the joining of the joint is completed, a gap of a certain size is generated between the inner periphery of the opening end of the receptacle and the outer periphery of the insertion port. Can be given.

In addition, a predetermined distance is provided between the distal end of the insertion port engaged with the lock ring and the rear end of the receptacle, and the distal end of the insertion port is located slightly behind the lock ring. By inserting up to this, it is possible to provide a telescopic function between the receiving port and the receiving port.

[0006]

As shown in FIG. 8, when a pipe is laid using this kind of pipe joint, the straight pipe portion 42 of the pipe 41 can cope with an external force acting thereon. In addition, it is desirable to make the pipe joint expandable and contractable as described above. However, in a place where the non-average force acts, such as the curved pipe portion 43, if the pipe joint expands or contracts, a good connection cannot be maintained.

In this case, in particular, the straight pipe section 42 and the curved pipe section 43
In a pipe joint 44 forming a joint portion with the pipe section 42, a type that allows normal expansion and contraction and bending is used as the receiving port 45 of the straight pipe section 42.
Inconvenience arises when joining.

In order to eliminate such inconvenience, it has been proposed to interpose a tubular liner between the distal end of the insertion port and the rear end of the receptacle in the pipe joint. In this way, the presence of the liner prevents the insertion port from moving in the pipe axis direction, thereby easily preventing expansion and contraction of the pipe joint.

[0009] However, although the expansion and contraction of the pipe joint can be prevented by merely attaching the liner in this way, there is a problem that the bending thereof is not sufficiently addressed.
Therefore, an object of the present invention is to solve such a problem and to prevent occurrence of bending in a pipe joint with a simple configuration.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a lock ring in a lock ring accommodating groove formed on the inner periphery of a socket, and a lock ring inserted into the socket. A projection is provided on the outer periphery of the distal end to prevent the insertion of the opening from the receiving port by engaging with the lock ring, and the receiving port is further provided inside the receiving port than a position where the inserting port can engage with the lock ring. means for regulating the tip and its movement in contact with the spigot in an attempt to move to the far side of the mouth is disposed, on the outer circumference of the spigot, the
Create a gap between the outer peripheral surface of the insertion opening and the inner peripheral surface of the
A bend-preventing projection to prevent bending of the
Formed on the body, this bending prevention protrusion moves the tip of the insertion port
The projecting part of the insertion from the position corresponding to the regulating means
The receptacle and the insertion port expand and contract within the range up to the engagement position.
In this case, the outer peripheral surface of the insertion port and the opening
The receptacle, which can fill a gap between the inner peripheral surface of
And has a dimension in the direction of expansion and contraction between the
By forming a plurality in the divided state, it is possible to
It is configured so that a gap is formed between
It is what has been .

[0011]

According to the above construction, the outer peripheral surface of the insertion opening and the opening of the receiving opening are provided.
Fill the gap between the inner peripheral surface of the
The protrusion for preventing bending prevents the tip of the insertion port from moving.
The projection of the insertion hole engages with the lock ring from the position where
In any case where the mouthpiece and the mouthpiece expand and contract within the range up to the position
Also, the outer peripheral surface of the insertion opening and the inner peripheral surface of the opening of the receiving opening
Between the socket and the insert, which can fill the gap between
Dimensions in the direction of expansion and contraction
Whatever the state of expansion and contraction is, the allowable range in which the receiving port and the insertion port are bent to each other is minimized, so that the receiving port and the insertion port are not bent even when an external force is applied. In addition, bending prevention
A plurality of stopping projections are formed in a state of being divided in the circumferential direction.
Gaps between adjacent objects in the circumferential direction
This gap is used to
A thin plate with a thickness equal to or greater than the height of the
The pipe joint is dismantled by being driven between the receiving port openings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 illustrates an example in which the pipe joint of the present invention is applied to a joint portion between a straight pipe portion 42 and a curved pipe portion 43 in FIG. Reference numeral 1 denotes a socket for a tube constituting a straight tube portion, and reference numeral 7 denotes an insertion opening for a tube constituting a curved tube portion. A seal material accommodating groove 2 is formed on the inner periphery of a portion of the receiving port 1 on the back side of the opening 13, and an annular seal material 3 is disposed in the seal material accommodating groove 2. A lock ring housing groove 4 is formed on the back side of the seal material housing groove 2, and a metal lock ring 5, which is divided in the circumferential direction, is mounted in the lock ring housing groove 4. An inclined surface 18 is formed on the inner periphery of the lock ring 5. Between the outer peripheral side of the lock ring 5 and the inner peripheral side of the lock ring housing groove 4, a centering rubber ring 6 for centering the lock ring 5 is arranged. A projection 8 is integrally formed on the outer periphery of the distal end portion of the insertion port 7 so as to be engaged with the lock ring 5 from the back side of the reception port.
An inclined surface 9 is formed on the outer periphery of the protrusion 8 in a tapered shape.

A metal ring-shaped liner 11 is disposed between the inner end face 10 of the receptacle 1 and the tip of the insertion port 7. Reference numeral 12 denotes a ring-shaped rubber member, which is arranged on the outer peripheral side of the liner 11 for centering the liner 11. .

As shown in FIG. 1, the projection 8 of the insertion port 7 enters the depth side of the receiving port 1 beyond the lock ring 5 and
In a state close to the opening, the outer surface of the insertion port 7 on the opening side of the receiving port 1 with respect to the sealing material 3 is opposed to the inner surface of the opening of the receiving port 1 to prevent bending which fills the gap between the receiving port insertion ports. A projection 15 is formed. The projection 15 for preventing bending is
As shown in FIG. 2, a plurality of projections 15 are formed in a state of being divided in the circumferential direction, and a gap 16 is formed between the protrusions 15 adjacent in the circumferential direction. In the illustrated example, the protrusions 15 are formed at eight locations at equal intervals in the circumferential direction.

On the outer surface of the insertion port 7 at a position away from the end face of the receptacle 1, a plurality of circumferentially extending stoppers 17 projecting radially outward beyond the bending prevention projection 15. Are formed. The stoppers 17 are formed at four locations in the circumferential direction corresponding to every other projection 15. The protrusion 15 is provided beyond the opening 13 of the receptacle 1 to a position where the stopper 17 exists.

At the time of joining the socket 1 and the insertion port 7, first, a rubber member 12 for centering is mounted on the inner side of the socket 1 and the liner 11 is arranged on the inner periphery thereof. The centering rubber ring 6 is mounted in the lock ring housing groove 4, and the lock ring 5 is arranged on the inner periphery thereof. Then, the sealing material 3 is accommodated in the sealing material accommodation groove 2.

In this state, the insertion port 7 is brought close to the reception port 1,
The two are joined using a joining device 21 shown in FIG. More specifically, the saddle-shaped receiving ring 22 is engaged with the neck of the receiving port 1 from above, and the saddle-shaped insertion clamp 23
The insertion clamp 23 is engaged with the top of the insertion port 7 so as to engage with the side of the stopper 17 that is farther from the end face of the receptacle 1. The eccentric roller 2 is attached to the insertion port clamp 23.
4 is provided, and a telescopic end of a cylinder device 25 whose base end is connected to the receiving ring 22 is connected to the eccentric roller 24 via a clevis 26. Pipe lines 27 are connected to one end and the other end of the cylinder device 25, respectively, and these pipe lines 27 are connected to a manual pump.

When the joining device 21 is set as shown in FIG. 3, the manual pump 28 is operated to operate the cylinder device 25.
To shrink. Then, the insertion clamp 23 is moved to the stopper 1.
7 and the eccentric roller 24 is
It is rotated by the contraction force of 5 and fastened to the outer surface of the insertion opening 7. When the cylinder device 25 is further contracted,
The insertion port 7 is inserted into the reception port 1 through the opening 13. Then, the insertion port 7 is first pushed into the sealing material 3 by the guide of the inclined surface 9, and the sealing material 3 is compressed between the outer circumference of the insertion port 7 and the inner circumference of the receiving port 1, and is inserted into the receiving port 1. A seal with the mouth 7 is ensured. In addition, the lock ring 5 is held by the centering ring 6 without being eccentric, and in this state, the insertion port 7 is held.
When the lock ring 5 is pushed into the inner peripheral side of the lock ring 5, the lock ring 5 is similarly elastically expanded in diameter by the inclined surfaces 9 and 18, and when the insertion port 7 is further pushed in, the projection 8 passes through the lock ring 5. I do. Thereafter, the lock ring 5 returns to its original state, and is securely fitted on the outer periphery of the insertion opening 7. For this reason, even if the insertion opening 7 attempts to move in the direction away from the receiving opening 1, the projection 8 comes into contact with and engages with the inner side surface of the lock ring 5, so that a reliable separation prevention function is exhibited.

As shown in FIG. 1, since the tip of the insertion port 7 approaches the end face of the liner 11, the relative movement between the receiving port 1 and the receiving port 7 is restricted. The expansion and contraction dimension with 7 is kept to a minimum.

As a result, the joining operation of the joint is completed. By removing the joining device 21, the state shown in FIG. 1 is obtained. Between the receiving port 1 and the insertion port 7, there is a slight expansion / contraction dimension as described above, and FIG. 4 shows a state in which the receiving port 7 is pushed into the receiving port 1 most. 5
Indicates a state where the user has slipped out of the receptacle 1 most. As shown, in each case, the bending preventing projection 15 faces the inner peripheral surface of the opening 13 of the receptacle 1, and a reliable bending preventing effect can be obtained. Further, the protrusion 15 has such a size that it does not hit the sealing material 3 even in the case shown in FIG.

As a result, the gap between the outer periphery of the insertion port 7 and the inner peripheral surface of the opening 13 of the receiving port 1 is always filled by the bending preventing projection 15, so that the gap between the receiving port 1 and the receiving port The mutual allowable bending range is minimized, and substantial bending is prevented from occurring even when an external force acts.

When the pipe joint is disassembled, as shown in FIGS. 6 and 2, a gap 16 between the protrusions 15 adjacent in the circumferential direction is provided.
The thin plate 29 is driven into the space between the receiving holes by using the method. The thickness of the thin plate 29 is equal to or greater than the height of the projection 8 at the tip of the insertion port 7. Then, the tip of the thin plate 29 is
Of the lock ring 5 after passing through the inner surface of
The lock ring 5 is expanded by being guided into the inner periphery of the lock ring 5, so that the protrusion 8 can escape through the lock ring 5 and the seal member 3.

FIG. 7 shows that the above-mentioned insertion port 7 is connected to a receiving port 31 of a deformed pipe.
This shows what was joined. As shown, the socket 31 of the deformed pipe
Since there is no need for expansion and contraction of the pipe joint,
The insertion opening 7 when the projection 8 of the
The rear end face 10 of the socket 31 is formed at a position close to the front end face of the socket 31. A circumferentially split push ring 32 is arranged on the outer periphery of the insertion opening 7 at the position of the bending preventing projection 15, and the pressing ring 32 is fixed to each projection by a set bolt 33 screwed from the outer surface of the receptacle 1. By pressing against the outer surface of the, complete bending is prevented. In addition, also in the case of the pipe joint shown in FIG. 7, the joining is performed by the joining device 21 shown in FIG.

[0024]

As described above, according to the present invention, the outside of the insertion hole
Insert the hole by filling the gap between the peripheral surface and the inner peripheral surface of the opening of the receptacle
The bend preventing projection that prevents bending between the
The projection of the insertion slot is locked from the position where the end hits the movement restriction means
The socket and the insertion port expand and contract up to the position where they engage with the ring
In any case, the outer peripheral surface of this
It is possible to fill the gap between the inner peripheral surface of the opening,
In order to have the dimension of the expansion and contraction direction of the receiving port and the insertion port
Therefore, regardless of the expansion and contraction state of the receiving port and the insertion port,
The allowable range in which the receiving port and the insertion port are bent to each other is minimized, and the port and the insertion port can be configured not to bend even when an external force is applied. However, a good bonding relationship can be maintained. In addition, the bending prevention protrusion is in a state of being divided in the circumferential direction.
By forming a plurality in the
Because it is configured so that a gap is formed between the
Using this gap, it is equal to or higher than the height of the protrusion at the tip of the insertion hole
The pipe joint is released by driving a thin plate
Can be body.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a detachment prevention pipe joint according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the detachment prevention pipe joint.

FIG. 3 is a view showing a joining device for the separation preventing pipe joint.

FIG. 4 is a diagram showing a state in which the insertion port is pushed into the receiving port at the maximum in the separation-preventing pipe joint.

FIG. 5 is a diagram showing a state in which the insertion port is most removed from the receiving port in the separation-preventing pipe joint.

FIG. 6 is a view for explaining a disassembling operation of the detachment prevention pipe joint.

FIG. 7 is a view showing another example of the separation preventing pipe joint according to the present invention.

FIG. 8 is a diagram showing an example of a conventional pipe line having a straight pipe section and a curved pipe section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reception opening 4 Lock ring accommodation groove 5 Lock ring 7 Insertion opening 8 Protrusion 10 Back end face 11 Liner 15 Bend prevention projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-231572 (JP, A) Japanese Utility Model Sho 56-55180 (JP, U) Japanese Utility Model Utility Model Sho 57-89080 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F16L 21/08

Claims (1)

(57) [Claims] 1. A lock ring is mounted in a lock ring receiving groove formed on an inner periphery of a receiving port, and is engaged with the lock ring on an outer periphery of a tip of an insertion port inserted into the receiving port. A projection is provided to prevent the insertion of the insertion hole from coming off, and the tip of this insertion port is to be moved to a position further inside the reception port than the position at which the insertion port can engage with the lock ring. a contact disposed a means for restricting the movement, the outer periphery of the spigot, the
Create a gap between the outer peripheral surface of the insertion opening and the inner peripheral surface of the
A bend-preventing projection to prevent bending of the
Formed on the body, this bending prevention protrusion moves the tip of the insertion port
The projecting part of the insertion from the position corresponding to the regulating means
The receptacle and the insertion port expand and contract within the range up to the engagement position.
In this case, the outer peripheral surface of the insertion port and the opening
The receptacle, which can fill the gap between the inner peripheral surface of
And has a dimension in the direction of expansion and contraction
By forming a plurality in a divided state, it is possible to
It is configured so that a gap is formed between
A pipe joint for preventing separation.