JPH08121662A - Pipeline joint device - Google Patents

Abstract

PURPOSE: To provide a joint device which can connect a pipeline to a joint body easily and rapidly by anyone with light force, without requiring skill even in a small space regarding a pipeline joint device constituted in such a way as to strike a key member to make it bite into the surface of the pipeline. CONSTITUTION: A pipeline joint device is constituted of a joint body 4 with a through hole 7 formed to tangentially face a part of the surface of a spigot pipeline 2, and a key member 5 driven into the through hole 7. The key member 5 is provided with a taper part 9 coming in contact with the surface of a pipeline 2 at the beginning of driving so as to bite into the surface of the pipeline 2 in association with driving, and a locking part 8 locked to a bite face part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a steel pipe, a stainless pipe,
In addition, the present invention relates to a joint device for various pipes such as copper pipes and synthetic resins.

[0002]

2. Description of the Related Art A pipe joint device of this type is shown in FIG.
As shown in FIG. 2, a joint main body 23 formed by opening two slits 22, 22 facing the surface of the insertion pipe 21 on both side surfaces of the pipe axis center and the two slits 22, 2
U-shaped key member 24 that is inserted and driven into
And the opposite locking portions 24a of the key member 24,
The dimension between the facing portions of 24b is set to be slightly smaller than the diameter of the pipe 21, and the tips of the locking portions 24a, 24b are brought into contact with the surface of the pipe 21 at the initial stage of driving and accompanying the driving. What formed the taper part 25 which bites into the surface of the piping 21 is known by Japanese Utility Model Laid-Open No. 5-6291.

According to the pipe joint device having such a structure, the pipe 21 to be connected is inserted into the joint main body 23, and the key member 24 is inserted into the slits 22 of the joint main body 23, and this is repeatedly hammered. Then, the surface of the pipe 21 is locally compressed and deformed by the taper portions 25 and 25 of the key member 24, and the taper portions 25 and 25 are made to bite into the compression deformation portion, and the locking portion is to the surface portion after the bite. By locking 24a and 24b, the connection of the pipe 21 to the joint body 23 is achieved.

[0004]

However, in the pipe joint device having such a configuration, since the key member 24 for compressing and deforming the surface of the pipe is U-shaped, the key driving force is two. The key members 24 are dispersed in the stoppers 24a and 24b. Therefore, when driving the key member 24, it is necessary to shake the hammer largely to repeatedly hit the key member 24, which causes heavy labor and also the key member 24.
There was a problem that it took a long time to drive in.

Further, the locking portions 24a, 2a are formed along with the driving.
Since 4b easily spreads with respect to each other, it is necessary to make the key member 24 wide in order to increase the strength of the base portions of the locking portions 24a and 24b. Since the pipe 21 greatly protrudes from the surface, there is a great risk of catching clothes on the pipe 21 or damaging the body. In addition, since the support member of the pipe 21 receives a strong impact by the amount of the strong impact of the key member 24, there is a problem in that the support member has to have a strong structure. Since a wide space is required around the pipe for driving, there is a problem that the pipe connecting work becomes very difficult if the pipe space is narrow or the pipe is congested.

In particular, when driving the key member 24, the key member 24 is driven in a straight line, and the pipe 2
It is extremely important that the key member 24 is fitted and held, but when the key member 24 is struck by mistake, for example, when the upper end corner of the key member 24 is struck, the lower engaging portion 24b.
Can escape from the slit 22, and only the upper locking portion 24a can compress and deform the pipe 21.
In this case, the key member 24 comes into one-sided contact with the pipe 21, and the key member 24 is accompanied by a slight vibration of the pipe 21.
There is a great risk that the pipe 21 will fall out and lead to fatal escape of the pipe 21, and from this, the key member 24
A considerable degree of skill was required to drive in.

The present invention has been made in view of the above circumstances, and requires no skill and requires a light force. Therefore, the pipes can be quickly and reliably connected without shaking the hammer greatly. An object is to provide a joint device.

[0008]

The technical means taken by the present invention to achieve the above object are as follows. That is, the pipe joint device according to the present invention, a joint body in which a through hole that faces a part of the surface of the insertion pipe in the tangential direction is formed,
A key member driven into the through hole, and the key member, a taper portion that abuts the surface of the pipe in the initial stage of driving and bites into the surface of the pipe with the driving,
It is characterized in that an engaging portion that engages with the biting surface portion is provided.

[0009]

According to the above characteristic structure, the pipe to be connected is inserted into the joint body so that a part of the surface of the pipe is exposed to the through hole, while the key member is inserted into the through hole and the key member is hammered. When hit by, the surface of the pipe is locally compressed and deformed by the taper of the key member that is inserted into the through hole and is in the restrained state.
By repeatedly striking this key member, the taper part bites into the compression deformation part one by one, and the locking part locks on the surface part after the bite, thereby connecting the pipe to the joint body. To be done.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a pipe joint device 1 according to a first embodiment of the present invention. The pipe joint device 1 is for connecting a pipe 2 made of a metal such as a steel pipe or a stainless pipe, or made of synthetic resin, for example, and has an insertion pipe portion 3 of the pipe 2.
From a metal joint body 4 provided on both sides and a key member 5 that bites into the surface of the pipe 2 inserted in the insertion pipe portion 3 and connects and fixes the pipe 2 to the joint body 4 in a retaining state. Become.

Specifically, a position restricting member 6 for restricting the inserting position of the pipe 2 is provided inside the inserting pipe portions 3, 3 of the joint body 4 and is inserted on both sides of the position restricting member 6. A concave groove b for fitting and holding an O-ring a for sealing with respect to the pipe 2 is formed, and a semicircular shape in a direction orthogonal to the pipe axis center on the outer surface portion on the pipe end side of the concave groove b. The bulging portions 4a of the
Further, a circular through hole 7 is formed so as to tangentially face a part of the surface of the pipe 2 inserted into the insertion pipe portion 3.

The key member 5 is to be driven into the through hole 7 and has a head portion c having a diameter larger than the hole diameter of the through hole 7 and has a diameter corresponding to the hole diameter. On the tip end side of the locking portion 8 formed by a pin, a truncated cone-shaped taper portion 9 that contacts the surface of the pipe 2 in a state of being inserted into the through hole 7 is formed, and at the tip end of this taper portion 9. The screw portion d is continuously provided, and the total length dimension of the locking portion 8 and the taper portion 9 is set to be slightly smaller than the length dimension of the bulging portion 4a.

Piping 2 with the piping joint device 1 having such a structure
The connection to the joint body 4 is performed as follows. First, until the end of the pipe 2 passes through the through hole 7 and the O-ring a and the end of the pipe 2 is located in the vicinity of the position regulating member 6 or abuts on the position regulating member 6. , Insert this pipe 2 into the insertion pipe part 3 of the joint body 4,
A part of the surface of the pipe 2 is exposed to the through hole 7 of the joint body 4 (see the right side of FIG. 2).

The determination as to whether or not the pipe 2 has been inserted in a predetermined manner is a sensory one. Therefore, in order to ensure the accuracy of the pipe insertion, it is preferable to mark the pipe surface by, for example, color coating in consideration of the predetermined insertion size of the pipe 2 so that the pipe 2 has the predetermined size. That is, the marking can be visually confirmed through the through hole 7 of the joint body 4 when the marking is inserted into the.

Next, the key member 5 is inserted into the through hole 7, and the key member 5 is hammered with the tapered portion 9 of the key member 5 being in contact with the surface of the pipe 2. Then
Along with the driving of the key member 5, the surface of the pipe 2 is locally compressed and deformed by the taper portion 9 of the key member 5 which is inserted into the through hole 7 and is in a restrained state. The tapered portion 9 will bite. By repeatedly striking the key member 5, the tapered portion 9 sequentially bites into the compression deformation portion of the pipe surface, and the locking portion 8 is locked to the surface portion after the biting, whereby The pipe 2 is connected and fixed to the joint body 4 in a retaining state, and thereafter, the nut d is screwed to the threaded portion d as necessary to prevent the key member 5 from coming off. This completes the plug-in connection of the pipe 2 with respect to.

According to the above structure, the surface of the pipe is locally compressed and deformed, and the engaging portion is engaged with the biting surface portion of the pipe, which is different from the conventional pipe connection by the U-shaped key member. Although there is no change, since the key member 5 to be hit is a single piece that is restrained in the through hole 7, when hitting the key member 5, the hitting force is concentrated on this one key member 5. Therefore, the surface of the pipe 2 can be locally compressed and deformed by the taper portion 9 without the need to shake the hammer largely to hit the key member 5 strongly.

Therefore, according to the pipe joint device 1 having such a configuration, anyone can easily and quickly, without requiring skill.
Since the pipe 2 can be connected to the joint body 4 with a light force, and it is not necessary to swing the hammer largely,
Even if the piping space is narrow or the piping is congested, it is possible to connect the piping 2 without difficulty, and since the impact on the supporting member of the piping 2 is small, the structure of this supporting member can be simplified, Moreover, most of the key member 5 remains in the through hole 7, which is excellent in safety.

Next, the pipe joint device 1 according to the second embodiment will be described with reference to FIGS. 4 to 7. In this embodiment, a through hole which partially faces the surface of the plug-in pipe 2 in the tangential direction. 7 is rectangular, the key member 5 is connected to the joint body 4
With the pipe 2 inserted into the insertion pipe part 3 of the
The shape corresponding to the through hole portion (the portion where the area of the through hole 7 becomes the smallest when the pipe 2 is inserted) 7a of the through hole 7 except for the portion blocked by the pipe 2, that is, when the pipe 2 is inserted, A flat rectangular key body 10 having a sectional shape corresponding to the sectional shape of the portion where the area of the hole 7 is the smallest.
And a narrow locking member 11 which is continuously provided on the central portion of one side of the key body 10 in the width direction and locally compresses and deforms the piping surface facing the through hole 7 upon impact and locks the key. Body 10
And a striking face member 12 that is larger in shape than the through hole 7 that is continuously provided at one end in the longitudinal direction.

The engaging member 11 has the above-mentioned engaging portion 8 except the tip portion thereof.
A taper portion 9 is formed that abuts the surface of the pipe 2 with the tip of the key body 10 inserted into the through hole portion 7a.
Then, the tapered portion 9 bites into the surface of the pipe 2 as it is driven.

In the pipe joint device 1 having such a structure,
Although the structure of the key member 5 and the shape of the through hole 7 are different from those of the pipe joint device 1 shown and described in FIGS. 1 to 3, since the connection mode of the pipe 2 to the joint body 4 is the same,
A duplicate description of the connection mode will be avoided.

Next, the pipe joint device 1 according to the third embodiment will be described with reference to FIG. In this pipe joint device 1, an O-ring a for sealing the pipe 2 is provided inside the insertion pipe portion 3 on the inner side of the through hole 7 in the joint body 4.
On the other hand, the core 14 that supports the end of the pipe 2 from the inside is integrally provided continuously inside the joint body 4. The core 14 is formed concentrically with respect to the insertion pipe portion 3, and the outer surface of the core 14 has a cylindrical shape parallel to the inner surface of the insertion pipe portion 3, but the inner surface of the core 14 has a resistance to fluid as much as possible. It is tapered in order to make it smaller. The rest of the configuration is the same as that of the first embodiment described above, so a description thereof will be omitted.

According to this structure, since the end of the pipe 2 is supported from the inside by the core 14 when the pipe 2 is inserted into the insertion pipe portion 3 of the joint body 4, the key member 5 is inserted into the through hole 7. When the pipe 2 is driven and locally compressed and deformed, even if some bend occurs in the pipe wall portions located on both sides of the key member 5, the core wall 14 bends the bend of the pipe wall located near the O-ring a. It is possible to prevent the contact between the O-ring a and the outer surface of the pipe 2 to be stable.

That is, when the key member 5 is driven into the through hole 7 of the joint body 4 and the pipe 2 is locally compressed and deformed, if only the portion of the pipe wall in contact with the key member 5 is deformed, there is no problem. However, in reality, the tube wall portions located on both sides of the key member 5 often bend. Therefore, through hole 7 and O
If the space between the ring a and the ring a is too small, the bending of the pipe wall caused by the driving of the key member 5 reaches the position of the O ring a, and the contact between the O ring a and the outer surface of the pipe 2 is reduced, so that the O ring is absent. It may reduce the sealing performance due to a and may cause water leakage.

As a measure for avoiding such an inconvenience, the clearance between the through hole 7 and the O-ring a is set sufficiently wide so that the O-ring a is not affected by the bending of the pipe wall caused by the driving of the key member 5. However, in this case, since the distance between the through hole 7 and the O-ring a is increased, the length of the insertion pipe portion 3 in the joint body 4 is increased, and the pipe joint device is accordingly increased. The dimension of 1 becomes long.

In this respect, as shown in FIG. 8, if the core 14 that supports the end of the pipe 2 from the inside is provided inside the joint body 4, the gap between the through hole 7 and the O-ring a is set to be narrow. Also O
The ring a is not affected by the bending of the pipe wall due to the driving of the key member 5, and high sealing performance can be secured without increasing the dimension of the pipe joint device 1.

In FIG. 8, as the joint body 4 and the key member 5, the same type as the first embodiment shown in FIGS. 1 to 3 (a pipe joint device 1 using the key member 5 having a circular cross section) is shown. However, as the joint body 4 and the key member 5, as shown in FIGS.
Needless to say, it may be of the same type as the second embodiment shown in FIG.

Next, a pipe joint device 1 according to a fourth embodiment will be described with reference to FIGS. 9 to 11. This pipe joint device 1 is provided with an O seal for sealing the pipe 2 inside the insertion pipe portion 3 on the inner side of the through hole 7 in the joint body 4.
It is characterized in that, while the ring a is provided, a core-type packing 15 which is in pressure contact with the inner surface of the end portion of the pipe 2 is provided inside the joint body 4. The core type packing 15 is made of an elastic material such as rubber or synthetic resin, and has an annular portion 15a fitted into an annular groove 16 for positioning formed on the inner surface of the joint body 4 and an inner end of the annular portion 15a. And a tubular portion 15b that is integrally provided on both sides in the axial direction from the side, and the tubular portion 15b elastically contacts the inner surface of the pipe 2 to exert a sealing function.

According to this structure, the O-ring a which contacts the outer surface of the pipe 2 and the core type packing 1 which contacts the inner surface of the pipe 2
Since the double sealing function of 5 and 5 is exhibited, high sealing performance can be secured.

Incidentally, it is desirable to chamfer the inner surface side of the end of the pipe 2 between the core type packing 15 and the insertion pipe portion 3 of the joint body 4 so that the pipe 2 can be smoothly inserted. The outer surface of the tubular portion 15b of the core-type packing 15 may have a cylindrical shape parallel to the inner surface of the insertion tube portion 3, but in this embodiment, as shown in FIG. Cylindrical part 1 with a warp outward
The tip side of 5b is configured to strongly and surely contact the inner surface of the pipe 2. Further, in FIGS. 9 to 11, as the joint body 4 and the key member 5, the same type as that of the first embodiment shown in FIGS. 1 to 3 (the pipe joint device 1 using the key member 5 having a circular cross section) is illustrated. However, it goes without saying that the joint body 4 and the key member 5 may be of the same type as the second embodiment shown in FIGS. 4 to 7.

Next, the pipe joint device 1 according to the fifth embodiment will be described with reference to FIG. This pipe joint device 1 is an improvement of the pipe joint device 1 according to the second embodiment described above. As shown in FIG. 13, the outer surface of the pipe on the insertion end side is polished by, for example, a sander. For example, the pipe 2 processed into the tapered tapered surface portion 2a by the above or the pipe 2 drawn into the tapered tapered surface portion 2a by a squeeze machine or the like as shown in FIG. 14 is suitable for connection.

Specifically, the position regulating member 6 of the joint body 4
The annular recess f is formed in the vicinity of the
In addition, a sealing means having an inner surface thereof as a tapered surface S having a shape corresponding to the tapered tapered surface portion 2a of the pipe 2 (for example, made of hard or soft synthetic resin or rubber, and packing is exemplified in this embodiment) 13 is provided so that the pipe 2 and the sealing means 13 can be sealed as the pipe 2 moves in the inserting direction. As shown in FIG. 15, a locking member 11 forming the tapered portion 9 and the locking portion 8 is provided with a slight inclination in the tube axis direction of the pipe 2 with respect to the hole axis of the through hole 7. The pipe 2 is moved in the inserting direction when the key member 5 is driven.

That is, a thrust force for moving the pipe 2 in the axial direction of the pipe is generated on the inclined surface of the locking member 11 (the taper portion 9 and the locking portion 8) when the key member 5 is driven. The taper taper surface portion 2a of the pipe 2 and the taper surface S of the sealing means 13 are configured to form a seal by a taper touch.

According to the above construction, a part of the driving force of the key member 5 can be converted into a direction in which the tapered taper surface portion 2a of the pipe 2 is pressed against the taper surface S of the sealing means 13, so that the pipe 2 Familiarity with the sealing means 13 can be improved, and high sealing performance can be secured.

In the above embodiment, for example, packing is used as the sealing means 13. However, the tapered surface S is formed on the joint body 4 itself without forming the annular recess f, and the sealing means is used. 13, and the tapered taper surface portion 2a of the pipe 2 along with the movement of the pipe 2 in the inserting direction.
It is also possible to implement a seal by a tapered metal touch between the taper surface S and the taper surface S. At this time, for example, a liquid sealing material is applied between the surface portions of the metal touch. And

The pipe joint apparatus 1 according to the fifth embodiment described above is suitable for connecting the pipe 2 whose tapered end portion 2a is processed into a tapered end portion, but the present invention is not limited to this. As shown in FIG. 16, the sealing means 1
3, a flat packing, for example, is provided in the annular recess f so as to be in contact with the position regulating member 6, and the end face of the pipe 2 is brought into pressure contact with the sealing means 13 as the pipe 2 moves in the inserting direction. It can be implemented by configuring
In this case, it is possible to save the labor for processing the insertion end portion of the pipe 2 into a tapered tapered surface portion, which is preferable.

17 and 18 show another embodiment of the key member 5 itself. That is, the key member 5 shown in FIG.
Is a modification of a part of the key member 5 used in the second embodiment and the fifth embodiment. In the second embodiment and the fifth embodiment described above, for example, see FIG. As is clear from the above, the ridge line S1 of the engaging portion 8 that engages with the biting surface portion of the pipe surface formed by the tapered portion 9 is
Although it is made parallel to the slide surface (bottom surface) S2 of 0, in the key member 5 shown in FIG. 17, when the key member 5 is driven, the engaging portion 8 is further attached to the pipe surface of the biting surface portion. The ridge line of the locking portion 8 is formed in the taper portion S3 having a gentle slope so that the bite will bite.

When the key member 5 shown in FIG. 17 is used in the second embodiment, the locking member 11 (taper portion 9 and locking portion 8) is formed in the longitudinal direction of the key body 10. When used in the fifth embodiment, the locking member 11 (taper portion 9 and locking portion 8) is provided in parallel with the longitudinal direction of the key body 10 as shown in FIG. It will be provided to be inclined with respect to. Although not shown, in either case, the gently-sloping tapered portion S3 formed on the ridgeline of the locking portion 8 is extended to the tip of the locking member 11, and the tapered portion 9 is formed.
It is also possible to implement by arranging the taper portion S3 having a gentle slope formed on the ridge line of the locking portion 8 to have the same slope.

On the other hand, in the key member 5 shown in FIG. 18, a part of the key member 5 used in the pipe joint device 1 according to the fifth embodiment is deformed, and the locking portion 8 of the key member 5 is further modified as described above. It has a bite function. That is, the taper portion 9 that bites into the surface of the pipe 2 as the key member 5 is driven.
And the engaging portion 8 that engages with the biting surface portion of the pipe surface by the taper portion 9 have a shape of a semi-conical surface that is continuous with each other, and the conical center of the semi-conical surface is the hole of the through hole 7. It is a little inclined in the pipe axis direction of the pipe 2 with respect to the shaft center, and when the key member 5 is driven, the engaging portion 8 is further bited into the pipe surface of the biting surface portion by the taper portion 9, During this period, the pipe 2 is moved in the inserting direction. Then, the tip portion of the key body 10 is made to project from the through hole 7, and the protruding portion 1
The key member 5 is prevented from coming off by the bending deformation of 0a.

According to the configurations shown in FIGS. 17 and 18, the pipe wall of the pipe 2 is gradually deformed by driving the key member 5, so that the connection of the pipe 2 to the joint body 4 is made even more minor. It can be done by force.

In each of the above-described embodiments, one key member 5 is driven into one pipe 2 to be connected, but a predetermined interval is provided in the circumferential direction of the joint body 4. It is also possible to form a plurality of through holes 7 by forming a key member 5 into each of the through holes 7 and compressively deform the surface of the pipe 2 at a plurality of points. Further, since the key member 5 is constrained inside the through hole 7 and is tightly held between the surface of the pipe 2 which is compressed and deformed and the through hole 7, the nut d and the It is not necessary to specifically implement a retaining means by bending the protruding portion 10a.

[0041]

According to the first to sixth aspects of the invention, a pipe connection for hitting the key member to locally compressively deform the surface of the pipe and locking the locking portion of the key member to the compression deformed portion. When taking the form, the key member to be hit is formed as a single object restrained in the through hole, and the hitting force can be concentrated on this, so shake the hammer greatly. It is not necessary to hit the key member, so that anyone can easily and quickly connect the pipe to the joint body with a light force without requiring skill.

Moreover, since it is not necessary to shake the hammer largely, even if the piping space is narrow or the piping is congested, the piping can be connected without difficulty and the impact on the supporting member of the piping is reduced. Therefore, the structure of this support member can be simplified.

In particular, according to the second aspect, the pipe wall of the pipe is gradually deformed due to the driving of the key member, so that the pipe can be connected to the joint body with an even smaller force.

According to the fourth aspect, even if the gap between the through hole and the O-ring is set to be narrow, the O-ring is not affected by the bending of the pipe wall caused by the driving of the key member, and the size of the pipe joint device is reduced. High sealing performance can be secured without lengthening.

According to the fifth aspect, the O contacting the outer surface of the pipe
Since the ring and the core-type packing that comes into contact with the inner surface of the pipe exert a double sealing function, high sealing performance can be secured.

According to the sixth aspect, a part of the driving force of the key member can be converted into a direction in which the pipe is pressed against the sealing means, so that the fitting between the pipe and the sealing means can be improved and it is high. The sealing performance can be secured.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a pipe joint device showing a first embodiment.

FIG. 2 is a cross-sectional view of the main part of the pipe joint device showing the state before driving the key member on the right side.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is an exploded perspective view of a pipe joint device showing a second embodiment.

FIG. 5 is a perspective view in which a part of a key member is cut away.

FIG. 6 is a sectional view of the pipe joint device showing a state before driving the key member.

FIG. 7 is a cross-sectional view of the pipe joint device showing a key member driven state.

FIG. 8 is a cross-sectional view of a pipe joint device in a key member driven state showing a third embodiment.

FIG. 9 is a cross-sectional view of a pipe joint device in a key member driven state showing a fourth embodiment.

FIG. 10 is a cross-sectional view of a main part in a state before driving a key member.

FIG. 11 is a cross-sectional view of a main part in a state after driving the key member.

FIG. 12 is a plan view of a pipe joint device showing a fifth embodiment.

FIG. 13 is a vertical sectional side view of the pipe joint device.

FIG. 14 is a partial cross-sectional view of a pipe obtained by drawing the outer surface of the pipe on the insertion end side.

FIG. 15 is a perspective view in which a part of a key member is cut away.

FIG. 16 is a vertical cross-sectional side view of a pipe joint device showing another sealing mode.

FIG. 17 is a side view of another key member.

FIG. 18 is a perspective view of another key member.

FIG. 19 is an explanatory diagram of a conventional pipe joint device.

[Explanation of symbols]

2 ... Piping, 4 ... Joint body, 5 ... Key member, 7 ... Through hole, 8
... Locking part, 9 ... Tapered part, 13 ... Sealing means, S3 ... Tapered part with gentle inclination.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Keitaro Watanabe 4-1-1 Hommachi, Chuo-ku, Osaka Stock company Takenaka Corporation Osaka Main Store

Claims (6)

[Claims] 1. A joint main body in which a through hole is formed so as to face a part of the surface of the plug-in pipe in a tangential direction, and a key member driven into the through hole, and the key member includes:
1. A pipe joint device, comprising: a taper portion that comes into contact with the surface of the pipe at the initial stage of driving and that bites into the surface of the pipe when driving, and a locking portion that locks the biting surface portion. 2. The pipe joint device according to claim 1, wherein the locking portion is formed with a taper portion having a gentle inclination that further bites into the pipe surface of the biting surface portion when the key member is driven. 3. An O for sealing the pipe is provided inside the insertion pipe portion on the inner side of the through hole in the joint body.
The pipe joint device according to claim 1, wherein a ring is provided. 4. The pipe joint device according to claim 3, wherein a core that supports an end of the pipe from the inside is provided inside the joint body. 5. The pipe joint device according to claim 3, wherein a core-type packing that is in pressure contact with the inner surface of the end portion of the pipe is provided inside the joint body. 6. The inside of the joint main body is provided with a sealing means for achieving a seal between the pipe and the pipe in the inserting direction, while the locking portion is provided with the through hole. The pipe joint device according to claim 1 or 2, wherein the pipe is moved slightly in the pipe axial direction with respect to the hole axial center, and the pipe is moved in the inserting direction when the key member is driven.