JP2590188Y2 - Bayonet fitting - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bayonet joint suitable for connecting pipes used for water supply pipes and the like.

[0002]

2. Description of the Related Art FIG. 6 shows a known plug-in joint of this type. That is, the bayonet joint includes the tubular joint body 1, the lock ring 2, and the gasket 3. The tubular joint body 1 is formed by pressing a steel pipe or a stainless steel pipe, and is formed with an inclined step portion 11 for regulating the insertion amount of the pipe P in the vicinity of the central portion in the axial direction. Steps 1 projecting radially outward perpendicular to the axis C formed at both ends
2 and 12 to the insertion openings 13 and 13 at both ends in the axial direction, large-diameter portions 14 and 14 parallel to the axis C and large-diameter portions 14 and 14.
The taper portions 15, 15 whose diameters gradually decrease from the axially outer end 14 to the insertion ports 13, 13 are formed. The lock ring 2 is made of metal such as stainless steel and has an outer diameter of the taper inner surface 1 of the taper portion 15.
It is set to a value slightly smaller than the maximum inner diameter of 5A, and a value smaller than the minimum inner diameter, that is, a value relatively larger than the diameter of the insertion port 13. As shown in FIG. Has become. Therefore, the lock ring 2 is configured to be able to expand and contract. Gasket 3 of FIG.
Is formed in an annular shape by an elastic material such as rubber,
A metal annular retainer 16 is accommodated in the large-diameter portions 14 of the joint body 1 and disposed between the axially outer end surface and the lock ring 2.

In a case where a resin pipe P having a stiffener S fitted to a pipe end is connected to such a plug-in joint as shown in FIG. 8, the end of the pipe P is connected to the insertion port 13 of the joint body 1 as shown in FIG. , 13. As a result, the lock ring 2 is retracted until it is pushed by the pipe P and hits the retainer 16, and the retainer 16 hits the gasket 3 and presses the gasket 3 against the step portion 12. The ring 2 is pushed outward by the pipe P, and is fitted outside while being slightly bitten into the pipe P. Further, as shown in FIG. 9, the connection of the pipe P is completed by inserting the pipe P deeply until it comes into contact with the inclined step portion 11. When the connection of the pipe P is completed, the gasket 3 is sandwiched and compressed by the large-diameter portion 14 of the joint body 1 and the pipe P, whereby the seal between the joint body 1 and the pipe P is formed.
And watertightness is maintained.

On the other hand, when the pipe P moves in the direction in which the pipe P is pulled out in a state where the pipe P is connected to the joint body 1, the lock ring 2 slightly biting into the pipe P moves together with the pipe P. When the movement amount at this time reaches a predetermined value, the lock ring 2 strongly contacts the taper inner surface 15A of the taper portion 15 as shown in FIG. The diameter is reduced by being squeezed by the inner surface 15A. When the diameter of the lock ring 2 is reduced in this way, the lock ring 2 bites into the pipe P deeply, and the pipe P is prevented from coming off.

When connecting a resin pipe P with the joint body 1, as shown in FIG. 11, a lock ring 2 having a cross-sectional shape with a sharp biting portion 2A formed on the inner peripheral side is used. Thus, the pipe P is prevented from coming off. That is, when the diameter of the lock ring 2 as shown in FIG. 10 is reduced, the biting portion 2A of the lock ring 2
As described above, the pipe P is bitten, whereby the retaining force is increased and the pipe P can be reliably prevented from coming off.

However, when the pipe P is further moved from the state where the biting portion 2A bites into the pipe P, the pipe P is cut off at a depth corresponding to the biting amount, as shown in FIG. The wall thickness is reduced, and the strength of the pipe P is significantly reduced. Moreover, as the biting amount increases, the radially outer height of the lock ring 2 decreases from the state shown in FIG. 11 to the state shown in FIG. When this outside projection height becomes smaller than the gap H between the insertion opening 13 in the joint main body 1 and the outer periphery of the pipe P, the protrusion 13 includes the insertion opening 13 of the taper portion 15 of the joint main body 1.
The taper inner surface 15A of the taper portion 15 is inclined to the tip.
Because it is formed in a straight shape along the direction, will be the lock ring 2 comes out of the gap H, it lost the function of preventing the escape of the pipe P.

On the other hand, when the pipe P is prevented from coming off by the diameter reduction of the lock ring 2 as shown in FIG. 10, the reaction force of the force for reducing the diameter of the lock ring 2 by the taper inner surface 15A of the taper portion 15 is generated. It acts locally on the taper inner surface 15A of the taper portion 15 in a concentrated manner. Moreover, this reaction force is
12, the taper portion 15 of the joint body 1 is expanded and deformed as shown by the imaginary line in FIG. The retaining force of the pipe P via the ring 2 is significantly reduced.

On the other hand, when the pipe P is a metal pipe such as a stainless steel pipe, as shown in FIG. 14, a part of the circumference is cut, and two edges are formed at the boundary between the cut 4 and the outer peripheral surface. A lock ring 2 having a cross-sectional shape in which the portions 5 and 6 are formed is used. When the pipe P moves in the withdrawal direction of the pipe P in a state where the pipe P is connected to the joint body 1 using the lock ring 2 having such a cross-sectional shape, the lock ring 2 engaged with the pipe P Move with the tube P. When the movement amount at this time reaches a predetermined value, the lock ring 2 comes into contact with the taper inner surface 15A of the taper portion 15 as shown in FIG. Inner surface 15A
To reduce the diameter. Thus lock ring 2
When the diameter is reduced, the pipe P is prevented from coming off.

If the pipe P is further moved in such a retaining state, as shown in FIG.
The outer edge 6 contacts the outer peripheral surface of the pipe P to increase frictional resistance and prevent the pipe P from coming off. Also, as shown in FIG. 17, the recess 7 in which the lock ring 2 is fitted in the pipe P in advance.
Is formed, the lock ring 2 is engaged with the concave portion 7, and a more reliable action is exhibited. But,
The reaction force of the force for reducing the diameter of the lock ring 2 by the taper inner surface 15A of the taper portion 15 is the taper inner surface 1 of the taper portion 15.
5A acts locally and concentrated, and this reaction force will be significantly increased by the subsequent movement of the pipe P,
The taper portion 15 of the joint body 1 is expanded and deformed as shown by the imaginary line in FIG. It cannot be prevented.

[0010]

The problem to be solved is that the taper section 15 has the insertion port 13 as described above.
The tapered inner surface 15A of the taper portion 15
Insert that is formed in a straight shape along the direction of inclination
In viewing the joint, when the connection pipe of the resin pipe P, or reduce the strength of the pipe P by thinning of the pipe P, the locking ring 2
Is smaller than the gap between the insertion opening 13 of the joint body 1 and the outer periphery of the pipe P , and the lock ring 2 comes out of this gap to prevent the pipe P from coming off, or 2 of contraction径反force Te - Pa 15
Te - and locally concentrated in Pas inner surface 15A Te - the path portion 15 is expanded deformed, it by following loss of the pipe P is a point can not be reliably prevented, when the connection pipe is a metal tube The taper inner surface 1 of the taper portion 15 has a reduced diameter reaction force of the lock ring 2.
The taper portion 15 is locally concentrated to 5A to expand and deform the taper portion 15 ,
Following this, the pipe P cannot be reliably prevented from coming off.

[0011]

According to the present invention, there is provided a cylindrical joint body having tapered portions formed at both ends in the axial direction to gradually reduce the diameters at the insertion openings at both ends, and inserted into the joint body from the insertion opening. and a lock ring which is reduced in diameter by the path portion, the tape - - fitted on the tubular that is, the tube is the tape in the tube and that the co-moving when moving in the drawing direction path section the
The inner surface of the taper section up to the tip including the insertion port
In pointing <br/> included joint along a direction of inclination are formed in a straight shape, the Te - Pa of Te - abuts slidably in Pas inner surface Te - Pa outer surface, the tape - A taper inner surface inclined in the same direction as the outer surface of the pipe and abutting against the lock ring, and when the pipe moves in the pipe withdrawing direction, is pushed by the lock ring biting into the pipe to insert the joint body. sliding ring with wedges for preventing movement of the tube enters the mouth of the gap, before Kite - Pas portion Te - characterized in that it is interposed between the path internal surface and said locking ring In addition to preventing the loss of strength due to the thinning of the pipe when moving the pipe when connecting the resin pipe, preventing the pipe from coming off due to the removal of the lock ring, and preventing the pipe from connecting when the resin pipe and metal pipe are connected, Avoiding the expansion of the taper part of the joint body during movement to avoid the pipe To achieve the purpose of reliably prevented.

[0012]

According to the present invention, when the pipe moves in the direction in which the pipe is pulled out, the lock ring biting into the pipe moves together with the pipe, and the sliding ring moves together by being pushed by the lock ring. The lock ring is squeezed and reduced in diameter by the taper inner surface of the slide ring, and not only does the lock ring prevent the pipe from coming off, but also the wedge of the slide ring enters the gap in the insertion opening of the joint body. The movement of the tube is prevented by the wedge action, and the tube is more reliably prevented from coming off.

On the other hand, the reaction force of the force for reducing the diameter of the lock ring locally acts on the inner surface of the taper of the sliding ring, but the inner surface of the taper portion of the joint main body acts on the inner surface of the taper. The tapered portion of the joint main body does not expand and deform due to the action of being dispersed via the sliding ring. Therefore, the diameter of the lock ring is appropriately reduced, and the lock ring is reliably prevented from coming off.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the bayonet joint includes a tubular joint body 1, a lock ring 2, a gasket 3, and a slide ring 8. Since the tubular joint body 1, lock ring 2 and gasket 3 are configured in the same manner as in the conventional example of FIGS. 6 to 17, the same parts are denoted by the same reference numerals and detailed description is omitted.

The sliding ring 8 is made of a metal such as stainless steel, and has a split shape with a part in the circumferential direction removed like the lock ring 2. Fifteen
The taper inner surface 15A of the taper portion 15
A taper outer surface 8A that slidably contacts the taper outer surface 8A, and a taper inner surface 8B that is inclined in the same direction as the taper outer surface 8A and abuts on the lock ring 2. A wedge portion 8D bulging radially inward is provided on the side. In addition, a metal annular retainer 16 is provided at one axial end of the gasket 3.
Is arranged.

With such a configuration, for example, when connecting a resin pipe P with a stiffener S fitted to the pipe end, as shown in FIG. It is inserted into the mouths 13,13. As a result, the lock ring 2 is retracted until it is pushed by the pipe P and hits the retainer 16, and the retainer 16 hits the gasket 3 and presses the gasket 3 against the step portion 12. In this state,
The lock ring 2 is pushed outward by the pipe P, and is fitted to the pipe P with a slight bite. Further, as shown in FIG.
Into the pipe P until it hits the inclined step 11
Connection is completed. When the connection of the pipe P is completed, the joint body 1
The gasket 3 is sandwiched and compressed by the large-diameter portion 14 and the pipe P, whereby the sealing property between the joint body 1 and the pipe P is ensured, and watertightness is maintained.

Now, when the pipe P moves in the pulling-out direction of the pipe P, the lock ring 2 biting into the pipe P moves together with the pipe P as shown in FIG. It is pushed by 2 and moves together. Then, as shown in FIG. 5A, the lock ring 2 is squeezed and reduced in diameter by the taper inner surface 8B of the slide ring 8, and the pipe P is
Not only do not come off, but also the wedge 8D of the sliding ring 8.
Penetrates into the gap H of the insertion opening 13 of the joint body 1 and prevents the pipe P from moving by the wedge action, thereby more reliably preventing the pipe P from coming off. Therefore, the taper portion 15 of the joint body 1 is
The taper inner surface 15A extends to the tip including the insertion port 13.
Even if the pipe P is formed in a straight shape along the inclination direction, the pipe P is cut off by the biting portion 2A of the lock ring 2 to reduce the wall thickness and reduce the strength of the pipe P, or the lock ring 2 comes off. There is no such thing.

Although the reaction force of the force for reducing the diameter of the lock ring 2 locally concentrates on the taper inner surface 8B of the slide ring 8, the taper of the taper portion 15 in the joint body 1 is used. The taper portion 15 of the joint main body 1 does not expand and deform on the inner surface 15A of the joint because the taper portion 15 of the joint body 1 is dispersed and acts on the inner surface 15A via the sliding ring 8. Therefore, the diameter of the lock ring 2 can be appropriately reduced, and the pipe P can be reliably prevented from coming off. This is the same even when the pipe P is made of metal.

[0019] The height C ₁ of the notch 4 of the locking ring 2 of the embodiment is formed in about 20% of the wall thickness of the pipe P as shown in Figure 5 (b). The width C3 to abut the outer peripheral surface of the width C ₂ and the pipe P of the biting portion 2A of the locking ring 2 to bite into the pipe P is, by the height C ₁ of the ring diameter of the lock ring 2 notch 4 It is determined, but it is preferable to make it as long as possible. The inclination angle C ₄ of the biting portion 2A of the outer peripheral surface of the pipe P, it is preferable to be formed in 30 ° to 60 ° for drag reduction on insertion of the pipe P, in this embodiment The object is formed at 55 °. Also,
Tapered inner surface 8B of sliding ring 8 against the outer peripheral surface of pipe P
If the angle θ ₁ is too small, the lock ring 2 is likely to bite and escape easily, and if it is too large, it is difficult to bite and easily escape. 18 as an angle
° around it is found good, therefore, is that of this embodiment is formed the theta ₁ to 18 °. Further, the slide ring 8 Te - Pa outer surface 8A of the angle theta ₂ and the joint main body 1 of the Te -
The angle of the inner surface 15A is also formed at 18 ° with respect to the outer peripheral surface of the pipe P. Furthermore, the longer the axial width W of the inner peripheral surface of the wedge portion 8D of the sliding ring 8 to be brought into contact with the outer peripheral surface of the pipe P, the more securely the pipe P can be pulled out without damaging the pipe P significantly. It is preferable in that it can be stopped, and in this embodiment (width W)
It is longer than the width of the plus the width C ₂ and C3. If the outer peripheral surface of the pipe P is tightened with the inner peripheral surface of the wedge portion 8D, even if the portion of the pipe P outside the wedge portion 8D is creeped and thinned due to long-term use, The thinning due to the creep is stopped by the tightening of the inner peripheral surface of the wedge portion 8D, and does not affect the position of the lock ring 2. When the wedge portion 8D is inserted into the gap of the insertion opening 13 of the joint body 1, the taper portion 15 of the joint body 1 is reinforced. Therefore, when the joint body 1 is made of stainless steel, its thickness is increased. h can be reduced to 1/5 or less of the thickness of the pipe P, and the cost of the joint body 1 can be reduced.
Further, as shown in FIG. 5 (b), a contact surface 8F is formed on the inner peripheral side surface of the slide ring 8 to abut the outer peripheral surface side of the lock ring 2 to adjust the posture of the lock ring 2. In other words, the lock ring 2 can be properly bitten into a direction perpendicular to the axial direction of the pipe P to a predetermined depth.

[0020]

[Effects of the Invention] As described above, the present invention is a joint body.
Even after connecting the pipe to the
Flexible with the ability to move slightly in the pulling direction
It is possible to prevent breakage, and when a resin tube is connected, it is possible to prevent the loss of strength due to the thinning of the tube when moving the tube and the detachment of the tube due to the detachment of the lock ring, and the resin tube and metal tube When the tube is connected, it is possible to prevent the taper portion of the joint body from expanding and deforming during the movement of the tube, thereby securely preventing the tube from coming off.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention.

FIG. 2 is a half sectional view showing a state in which a pipe is being connected.

FIG. 3 is a half sectional view showing a completed connection state of a pipe.

FIG. 4 is an enlarged sectional view showing an initial state of relative movement between the joint body and the pipe.

FIG. 5A is an enlarged sectional view showing a state in which a tube is prevented from coming off by a wedge action, and FIG.

FIG. 6 is a half sectional view of a joint main body.

FIG. 7 is a front view showing an example of a lock ring.

FIG. 8 is a half sectional view showing a state in the middle of connection of pipes in a conventional bayonet joint.

FIG. 9 is a half-sectional view showing a completed connection state of a pipe.

FIG. 10 is an enlarged sectional view showing an initial state of relative movement between the joint body and the pipe.

FIG. 11 is an enlarged sectional view showing an example of a lock ring.

FIG. 12 is an enlarged cross-sectional view showing an initial state of a pipe wall thinning.

FIG. 13 is an enlarged cross-sectional view showing a progress state of thinning of a pipe.

FIG. 14 is an enlarged sectional view showing another example of the lock ring.

FIG. 15 is an enlarged sectional view showing an initial state of relative movement between the joint body and the pipe.

FIG. 16 is an enlarged sectional view showing a state in which a tube is held by a lock ring.

FIG. 17 is an enlarged sectional view showing a different example of the correspondence between the lock ring and the pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylindrical joint main body 2 Lock ring 8 Sliding ring 8A Tapered outer surface of sliding ring 8B Tapered inner surface of sliding ring 8D Wedge portion 13 Joint main body insertion port 15 Joint main body taper 15A -Inner surface of the pipe H Clearance of the insertion port of the joint body P pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A tubular joint body having tapered portions formed at both ends in an axial direction to gradually reduce the diameters toward the insertion ports at both ends, and a pipe inserted into the joint body from the insertion port, A lock ring whose diameter is reduced by the taper portion by co-moving with the pipe when the pipe moves in the drawing direction.
With the door, the Te - tip path portion including the spigot
Up to the taper inner surface along the inclination direction of the taper inner surface.
In bayonet joint are formed directly form the Te - Pa of Te - Te abuts slidably in Pas inner surface - and path outer surface, the tape - the lock ring is inclined in the same direction as the path outer surface When the pipe moves in the pipe withdrawal direction, it is pushed by the lock ring that bites into the pipe and enters the gap of the insertion port of the joint body to prevent the pipe from moving. sliding ring with wedges that are pre Kite - Pas portion
A plug joint, which is interposed between the inner surface of the taper and the lock ring.