JP5137195B2 - Pipe fitting - Google Patents

Description

The present invention relates to a tool-free one-touch type pipe joint that can be connected by simply inserting a deformable conduit such as a hose or pipe.
Specifically, a nipple and a tightening ring provided around the nipple are provided, and the diameter of the tightening ring is reduced by a conduit inserted between the nipple and the tightening ring, The present invention relates to a pipe joint in which the conduit is pressed against the outer peripheral surface of the nipple by its elastic force so as to be immovably connected.

Conventionally, as this type of pipe joint, a joint body having an insertion cylinder portion inserted into an end portion of a pipe to be connected and an end portion of a pipe externally fitted to the insertion cylinder portion are elastically tightened. A tightening ring with a slit for tightening with a tightening ring, and a diameter-enlarging piece that is sandwiched between the slits of the tightening ring to hold the tightening ring in a diameter-enlarged state. By removing the diameter-enlarging piece at the tip of the pipe inserted into the section, the above-mentioned tightening ring is reduced in diameter, the end of the pipe is tightened with its elastic tightening force, and its inner surface is the outer periphery of the nipple. There is what is pressed against the surface (for example, see Patent Document 1).
Further, a transparent cover that covers the tightening ring is attached to the joint body so that the removal of the enlarged diameter piece can be easily confirmed from the outside (visually).

JP 2001-295974 A (page 3-5, FIG. 1-18)

  However, in such a conventional pipe joint, since the diameter-expanded piece sandwiched in the slit of the tightening ring is removed by the tip of the pipe to reduce the diameter, impact and vibration are generated as the pipe is inserted. If there is an impact or vibration during transportation, dropping, etc., there is a risk that the diameter-expanding piece will suddenly come off and reduce its diameter. There was a problem of becoming.

The first invention of the present invention aims to reliably reduce the diameter of the tightening ring in connection with the insertion operation of the conduit and to securely connect without pulling out the conduit.
In addition to the object of the first invention, the second invention aims to reuse and reattach the pipe joint and the conduit.
In addition to the objects of the first invention or the second invention, the third invention is intended to securely fasten and fix the conduit regardless of the hardness of the conduit and to protect the outer peripheral surface of the conduit.

In order to achieve the above-described object, the first invention of the present invention supports the outer ring provided on the outside of the nipple so that the fastening ring is movable in the insertion direction of the conduit. A locking portion for temporarily fixing the tightening ring to the cylinder in an expanded state and an opening portion for releasing the temporary fixing so that the tightening ring is reduced in diameter are continuously provided in the insertion direction of the conduit. The clamping ring is movably locked in the tube insertion direction with respect to the locking portion, and the clamping ring is moved in the same direction in conjunction with the insertion of the conduit. It is characterized by.
According to a second aspect of the present invention, in the configuration of the first aspect, the tightening ring includes a clamp body that is bent in an annular shape, and standing pieces formed at both ends thereof. The clamp body is expanded in diameter by moving in the circumferential direction, and the standing piece is moved from the open portion of the outer cylinder toward the locking portion, so that the tightening ring is expanded in diameter. The arrangement is such that it is temporarily fixed to the locking portion.
According to a third invention, in the configuration of the first invention or the second invention, a sleeve capable of reducing the diameter is provided inside the tightening ring, and the tightening ring and the sleeve are arranged in the insertion direction of the conduit. An arrangement is provided in which an insertion space into which the conduit is inserted is formed between the sleeve and the nipple, and the sleeve and the tightening ring are moved in the same direction in conjunction with the insertion of the conduit. It is characterized by adding.

According to the first aspect of the present invention, a clamping ring is supported so as to be movable in the insertion direction of the conduit with respect to an outer cylinder provided outside the nipple, and the clamping ring is expanded on the outer cylinder. A locking portion for temporarily fixing in a diameter state and an opening portion for releasing the temporary fixing so that the tightening ring is deformed in a reduced diameter are formed continuously in the insertion direction of the conduit. The clamp ring is movably locked in the tube insertion direction with respect to the portion, and the clamp ring is moved in the same direction in conjunction with the insertion of the conduit, so that the clamp ring is moved from the lock portion. While the body is temporarily fixed in the expanded state, it is pushed toward the open part, and at the moment of moving to the open part, the diameter is deformed by its own elastic force by releasing the expanded state of the tightening ring, The conduit is pressed against the outer peripheral surface of the nipple by the compressive force, and is immovably connected.
Therefore, it is possible to reliably connect the tightening ring without reducing the diameter of the tightening ring as the conduit is inserted.
As a result, the reliability of pipe connection can be improved as compared with the conventional one in which when the pipe is inserted, transported, dropped or the like, an impact or vibration occurs, the diameter-expanding piece may be unexpectedly detached and the diameter may be reduced.

According to a second invention, in addition to the effects of the first invention, the tightening ring includes a clamp body that is bent in an annular shape, and standing pieces formed at both ends thereof. The clamp body is expanded in diameter by moving the piece in the circumferential direction, and the standing piece is moved from the open portion of the outer cylinder toward the locking portion, so that the tightening ring is expanded in diameter. By arranging to be temporarily fixed to the locking portion of the cylinder, the tightening ring is returned to the expanded state and temporarily fixed, and the conduit can be pulled out from the nipple.
Accordingly, the pipe joint and the conduit can be reused and reattached.
As a result, compared to conventional pipes that cannot be used as pipe joints once the diameter-expanded piece is detached, it can be repeated until the connection of the pipe to the pipe joint is complete and can be reused many times. Is.

In addition to the effects of the first invention or the second invention, the third invention is provided with a sleeve capable of reducing the diameter of the inside of the tightening ring, and inserting the tightening ring and the sleeve into the conduit. An insertion space into which a conduit is inserted is formed between the sleeve and the nipple, and the sleeve and the tightening ring are moved in the same direction in conjunction with the insertion of the conduit. Thus, even when the conduit is soft and the predetermined straightness cannot be obtained with its insertion, the fastening ring is pushed to the open position via the sleeve, and the elastic compression force of the fastening ring causes the sleeve to To the outer peripheral surface of the conduit.
Therefore, it is possible to securely fix and fix the outer peripheral surface of the conduit regardless of the hardness of the conduit.

  As shown in FIGS. 1 to 9, the embodiment of the pipe joint A of the present invention includes a cylindrical nipple 1 into which a deformable conduit B such as a hose or a pipe is inserted, and an outer peripheral surface 1 a of the nipple 1. There are provided a tightening ring 2 that is provided so as to face each other via the conduit B, and an outer cylinder 3 that is provided on the radially outer side of the nipple 1. 2 is temporarily fixed and supported in an expanded state so as to be movable in the insertion direction of the conduit B, and the clamping ring 2 is moved in the same direction in conjunction with the insertion of the conduit B. The temporary fixing of No. 2 is released and the diameter is reduced, and the conduit B is pressed against the outer peripheral surface 1a of the nipple 1 by its elastic force so as to be immovably connected.

  The nipple 1 is formed of a hard material such as a metal such as brass or a hard synthetic resin, and has an outer diameter that is substantially the same as or slightly larger than the inner diameter of the flexible tube B such as a tube or a hose. It is formed into a cylindrical shape, or a plate material made of a deformable rigid material, such as stainless steel, is formed into a thin cylindrical shape by pressing or other forming processes.

  As shown in FIGS. 2 and 3, the outer peripheral surface 1a of the nipple 1 is formed in a bamboo slab shape in which a plurality of annular protrusions and annular grooves are alternately arranged in the axial direction, respectively, or FIGS. As shown in FIGS. 8 and 9, an annular recess 1b extending in the circumferential direction is formed, and an elastically deformable annular seal material 1c is fitted into the annular recess 1b so as to be immovable in the axial direction. It is preferable to arrange the outer peripheral end of the material 1 c so as to protrude from the outer peripheral surface 1 a of the nipple 1.

  As shown in FIGS. 3, 6, and 9, the tightening ring 2 is reduced in diameter by cutting an elastic material such as spring steel into a strip shape by punching or the like and then turning it into an annular shape. A so-called hose clamp formed so as to be elastically deformed in the radial direction while having an urging force to be bent. The clamp body 2a that is turned in an annular shape and both ends of the clamp body 2a are bent outward in the radial direction. And the upright piece 2b that is upright.

  The clamp body 2a is bent so that the upright pieces 2b at both ends thereof intersect in the circumferential direction, and the upright pieces 2b are formed as shown in FIGS. 3 (a), 6 (a) and 9 (a). When the clamp body 2a is picked up by a tool or a finger, for example, and close to each other, the diameter of the clamp body 2a is increased. On the contrary, as shown in FIGS. 3 (b), 6 (b) and 9 (b), When the standing pieces 2b are separated from each other, it is preferable to reduce the diameter of the clamp body 2a.

Further, the clamping ring 2 is connected to the connecting end of the conduit B in order to move the clamping ring 2 in the same direction in conjunction with the conduit B inserted between the clamping ring 2 and the nipple 1. It is preferable to provide an engaging portion that engages.
This linkage part may be either integral with or separate from the tightening ring 2, and by changing the position of the linkage part in the insertion direction of the conduit B, the tightening position of the conduit B by the tightening ring 2 can be changed. Can be adjusted.
In addition, a sleeve 4 that can be deformed in a reduced diameter is provided inside the tightening ring 2, and the tightening ring 2 and the sleeve 4 are supported so as to be movable in the insertion direction of the conduit B. When the conduit B is inserted between the sleeve 1 and the sleeve 4, it is preferable that the sleeve 4 is provided with a linkage portion that engages with the connecting end portion of the conduit B.
As another example, instead of providing the linkage portion, it is also possible to move the tightening ring 2 or the sleeve 4 in the same direction by frictional resistance generated as the conduit B is inserted. .

The outer cylinder 3 is formed in a substantially cylindrical shape having an outer diameter larger than the outer diameter of the conduit B and the expanded state of the tightening ring 2, and the insertion direction of the conduit B with respect to the nipple 1 (hereinafter referred to as the following) It is attached so as not to move in the “tube insertion direction”) and in the direction opposite to the tube insertion direction (hereinafter referred to as “anti-insertion direction”).
As a specific example, it is preferable that the base end side of the outer cylinder 3 is fixed to a joint body formed integrally and continuously with the base end side of the nipple 1.

  Further, the outer cylinder 3 has a locking portion 3a for temporarily fixing the tightening ring 2 in its expanded diameter state, and an opening for releasing the temporary fixing so that the tightening ring 2 is deformed in a reduced diameter. The portion 3b is formed continuously in the tube insertion direction, and the fastening ring 2 is locked to the locking portion 3a so as to be movable in the tube insertion direction.

  In the engaging portion 3a and the opening portion 3b, an upright piece 2b of the tightening ring 2 is disposed so as to pass through the protruding portion 3b and protrude to the outside of the outer cylinder 3. By moving the clamp main body 2a in the anti-insertion direction while picking it so that the diameter of the clamp main body 2a is increased with a finger or the like, the upright piece 2b is moved from the opening portion 3b toward the locking portion 3a, and the clamp main body 2a is expanded. It is preferable to temporarily fix in the diameter state.

That is, the locking portion 3a is a concave groove that fits with the upright piece 2b of the tightening ring 2, and the pair of upright pieces 2b are arranged in the circumferential direction of the clamp body 2a so that they approach each other. By being locked so as not to move, the tightening ring 2 is temporarily fixed inside the outer cylinder 3 in the expanded state.
The opening 3b is an opening formed continuously in the tube insertion direction of the locking portion 3a, and the pair of upright pieces 2b of the tightening ring 2 are separated from each other so that they are separated from each other. The clamp body 2a is movable in the circumferential direction, and the diameter of the tightening ring 2 is released to reduce the diameter by its own elastic force.
Embodiments of the present invention will be described below with reference to the drawings.

In the first embodiment, as shown in FIGS. 1 to 3, the nipple 1 is formed in the shape of a bamboo shoot, and a nut portion 1d is integrally formed as a joint body formed on the proximal end side in the tube insertion direction. By inserting 1d between the proximal end portion 3c in the tube insertion direction of the outer cylinder 3 and the annular body 5 fixed to the outside of the outer cylinder 3, the outer cylinder 3 is connected to the nipple 1 in the tube insertion direction. And a non-movable attachment in the direction opposite to the insertion direction, showing a case where a connecting portion 1e for connecting to a pipe connection port (not shown) of another device is connected to the base end side from the nut portion 1d. It is.
In addition, what is necessary is just to select suitably from well-known connection methods, such as screwing and adhesion | attachment, as a fixing means of the pipe | tube insertion direction base end part 3c of the said outer cylinder 3, and the annular body 5, for example.

As shown in FIGS. 3 (a) and 3 (b), the clamp body 2a of the tightening ring 2 is formed with a notch 2c for making the clamping force of the entire circumference of the conduit B uniform with respect to the outer peripheral surface B1. The upright piece 2b is formed so as to intersect in the circumferential direction of the clamp body 2a when the other passes through a hole opened in the one side.
Further, as shown in FIG. 3 (c), a connecting portion 2d that is engaged with the distal end surface B2 of the conduit B in the circumferential direction is provided at the inner end of the tightening ring 2 in the tube insertion direction. A plurality of protrusions are provided at appropriate intervals.

  When the internal thread is engraved on the inner peripheral surface of the pipe connection port of another device connected to the pipe joint A, the connection portion 1e is engraved with an external screw corresponding thereto, When an external screw is engraved on the outer peripheral surface of the pipe connection port, an internal screw corresponding to this is engraved.

  In the case of the illustrated example, the nipple 1 is a cut product obtained by cutting a cylindrical material by, for example, cutting, and an external screw is engraved as the connecting portion 1e at the proximal end portion in the tube insertion direction.

Next, the pipe connection method of such a pipe joint A will be described in the order of steps, and the effects obtained thereby will also be described.
First, as shown in FIGS. 1 (a) and 2 (a), the upright piece 2b of the tightening ring 2 is locked to the locking portion 3a of the outer cylinder 3, and the clamp main body 2a is expanded in diameter. In the initial state temporarily fixed in the state, the connecting end of the conduit B is inserted into the insertion space S defined between the clamp body 2a of the tightening ring 2 and the outer peripheral surface 1a of the nipple 1. 1 (b) and FIG. 2 (b), the distal end surface B2 of the conduit B abuts against the linkage portion 2d of the tightening ring 2, and thereafter, the entire tightening ring 2 is tubed. Push in the insertion direction.

  As a result, the upright piece 2b of the tightening ring 2 slides in the tube insertion direction toward the open portion 3b along the lock portion 3a of the outer cylinder 3, and is pushed out from the lock portion 3a to the open portion 3b. It is.

When the pair of upright pieces 2b move to the open portion 3b, as shown in FIG. 1 (c) and FIG. 2 (c), the expanded diameter state of the tightening ring 2 is released at that moment, and the two are separated from each other. Thus, the clamp body 2a of the tightening ring 2 is deformed in a reduced diameter by moving in the circumferential direction.
The inner peripheral surface B3 of the conduit B is pressed against the outer peripheral surface 1a of the nipple 1 by the compressive force due to the diameter-reducing deformation, so that it cannot move.

  Thereafter, when it is necessary to open the connected conduit B, the upright pieces 2b penetrating the open portion 3b and projecting to the outside of the outer cylinder 3 are picked with a tool or a finger, for example, and approach each other. Then, the diameter of the clamp body 2a is increased.

When the upright piece 2b is moved in the anti-insertion direction in this expanded diameter state and moved to the locking portion 3a of the outer cylinder 3 as shown in FIGS. 1 (a) and 2 (a), the clamp body 2a Is temporarily fixed in the expanded state.
As a result, the conduit B can be pulled out from the nipple 1 so that the pipe joint A and the conduit B can be reused and reattached.

  In the second embodiment, as shown in FIGS. 4 to 6, the nipple 1 has an annular sealing material 1c inserted into the annular recess 1b, and a joint body formed on the proximal end side in the tube insertion direction. A screw portion 1f is integrally formed, and a tube insertion direction base end portion 3c of the outer cylinder 3 is screwed to the screw portion 1f, whereby the outer cylinder 3 is inserted into the nipple 1 in the tube insertion direction and the anti-insertion direction. The configuration of mounting in a non-movable manner is different from the first embodiment shown in FIGS. 1 to 3, and other configurations are the same as those of the first embodiment shown in FIGS. 1 to 3.

  Accordingly, the second embodiment shown in FIGS. 4 to 6 also has the same effect as that of the first embodiment described above, and in addition, the inner peripheral surface B3 of the conduit B is reduced to the nipple 1 due to the reduced diameter of the tightening ring 2. Since the inner peripheral surface B3 of the conduit B and the annular seal member 1c are strongly pressed against the annular sealing material 1c protruding from the outer peripheral surface 1a of the pipe B, the conduit B is formed of a relatively hard material. However, there is an advantage that the nipple 1 can be reliably sealed.

  In Example 1 and Example 2 described above, a plurality of linking parts 2d are provided at appropriate intervals in the circumferential direction at the pipe insertion direction end of the inner periphery of the tightening ring 2. If the fastening ring 2 can be moved in the same direction along with the insertion, the linkage part 2d can be formed extending from the fastening ring 2 or a separate linkage part can be attached to the fastening ring 2 It is also possible to design appropriately.

  In this third embodiment, as shown in FIGS. 7 to 9, a sleeve 4 that can be deformed in a reduced diameter is provided inside the fastening ring 2, and the fastening ring 2 and the sleeve 4 are linked to each other in the tube insertion direction. The connecting end of the conduit B is inserted into the insertion space S defined between the sleeve 4 and the nipple 1, and the inner periphery of the tightening ring 2 is inserted. A configuration in which a linkage portion 4a interlocked with the insertion of the conduit B is formed in the sleeve 4 in place of the linkage portion 2d provided at the end portion in the tube insertion direction is the embodiment 1 or FIG. Unlike the second embodiment shown in FIGS. 4 to 6, the other configurations are the same as those of the first or second embodiment.

  The sleeve 4 is formed in a substantially cylindrical shape with an elastically deformable material such as polyacetal resin or other synthetic resin having excellent surface slipperiness and heat resistance. The sleeve 4 extends from the open end to the tube insertion direction. A plurality of notches 4b are formed in the circumferential direction to facilitate elastic deformation in the radial direction.

Further, on the outer peripheral surface of the sleeve 4, as shown in FIGS. 9A and 9B, an engagement portion 4c that fits in the tube insertion direction with the fastening ring 2 is formed. It is preferable that an annular protrusion 4d for biting into the outer peripheral surface B1 of the conduit B is formed on the surface.
Further, at the end of the sleeve 4 in the tube insertion direction, as shown in FIG. 9C, the linkage portion 4a engaged with the distal end surface B2 of the conduit B is engaged with the slit 4b. It is provided in a ring shape in the circumferential direction with a sandwich.
If the sleeve 4 and the tightening ring 2 can be moved in the same direction in conjunction with the insertion of the conduit B, the linkage portion 4a and the annular protrusion 4d formed on the sleeve 4 can be omitted.

Next, the pipe connection method of such a pipe joint A will be described in the order of steps, and the effects obtained thereby will also be described.
First, in the initial state shown in FIGS. 7A and 8A, if the connecting end of the conduit B is inserted toward the insertion space S defined between the sleeve 4 and the nipple 1, As shown in FIGS. 7 (b) and 8 (b), the distal end surface B2 of the conduit B abuts on the connecting portion 4a of the sleeve 4, and thereafter, the entire sleeve 4 and the tightening ring 2 are inserted into the tube. Push in the direction.

As a result, the upright piece 2b of the tightening ring 2 slides in the tube insertion direction from the locking portion 3a of the outer cylinder 3 toward the opening portion 3b, and when it moves to the opening portion 3b, FIG. c) and FIG. 8 (c), the diameter expansion state of the tightening ring 2 is released at that moment, and it moves in the circumferential direction so as to be separated from each other. The diameter of the clamp body 2a is reduced and the sleeve 4 is also reduced in diameter.
The inner peripheral surface B3 of the conduit B is pressed against the outer peripheral surface 1a of the nipple 1 by the compressive force generated by the diameter-reducing deformation and is connected so as not to move.

  Accordingly, the third embodiment shown in FIGS. 7 to 9 can obtain the same effects as those of the first embodiment or the second embodiment described above, and in addition, the conduit B is soft and has a predetermined straightness as it is inserted. Even if it cannot be obtained, the upright piece 2b of the tightening ring 2 is pushed to the open position via the sleeve 4, and the elastic compressive force of the tightening ring 2 is connected to the outer periphery of the conduit B via the sleeve 4. Since it is transmitted to the surface B1, there is an advantage that the conduit B can be securely fastened regardless of the hardness of the conduit B, and the outer peripheral surface B1 of the conduit B can be protected to prevent the occurrence of damage.

  In the fourth embodiment, as shown in FIGS. 10 to 12, one end opening of the outer cylinder 3 is provided to facilitate the setting of the tightening ring 2 with respect to the locking portion 3a and the opening portion 3b of the outer cylinder 3. Unlike the third embodiment shown in FIGS. 7 to 9, the configuration in which the guide portion 4 e that continues from the locking portion 3 a or the opening portion 3 b is formed is the same as the third embodiment. .

  In the case of the illustrated example, as the guide portion 4e, a pair of slits into which the upright pieces 2b of the tightening ring 2 can be inserted from the tube insertion direction end of the outer cylinder 3 toward the open portion 3b are opened. The guide ring 4e is guided to the open portion 3b while the diameter of the tightening ring 2 is reduced, and the annular body 6 is inserted into the outer side of the outer tube 3 in the tube insertion direction. By fixing by a known connection method such as bonding, the slit-shaped guide portion 4e is closed to prevent the fastening ring body 2 from coming off, and the diameter of the end of the outer cylinder 3 in the tube insertion direction is prevented. .

The tightening ring 2 guided to the opening 3b clamps the standing piece 2b that penetrates the opening 3b and protrudes to the outside of the outer cylinder 3 with a tool or a finger, for example. The diameter of the main body 2a is expanded, and the upright piece 2b is moved in the anti-insertion direction in the expanded diameter state, and as shown in FIGS. 10 (a) and 11 (a), the locking portion 3a of the outer cylinder 3 is moved. , The clamp body 2a is temporarily fixed in the expanded diameter state, and the setting is completed.
Since it becomes the pipe connection method of the pipe joint A similar to Example 3 mentioned above after that, description is abbreviate | omitted.

In the illustrated example, a pair of the open portions 3b of the outer cylinder 3 are formed in the circumferential direction continuously with the slit-shaped guide portion 4e. However, a single opening may be used as in the third embodiment. .
Furthermore, as an example other than the illustrated example, a pair of slit-shaped guide portions 4e into which the standing pieces 2b of the tightening ring 2 can be inserted from the opposite end of the outer cylinder 3 toward the locking portion 3a are opened, After the tightening ring 2 is guided to the locking portion 3a in the slit-like guide portion 4e in the expanded state, the annular body 6 is attached to the end of the outer cylinder 3 in the anti-insertion direction, for example, by screwing or bonding. It is also possible to fix by a known connection method.

  Accordingly, the fourth embodiment shown in FIGS. 10 to 12 also achieves the same operation and effect as the third embodiment described above, and in addition, it becomes easier to set the tightening ring 2 on the outer cylinder 3. There is an advantage that the work time required for the assembly can be shortened and the cost can be reduced.

In the previous embodiment, the upright piece 2b of the fastening ring 2 that protrudes outwardly through the open portion 3b of the outer cylinder 3 is picked with a tool or a finger and brought close to each other. Although the diameter of the clamp main body 2a of the tightening ring 2 is increased, the present invention is not limited to this, and a slide member is provided on the outside of the outer cylinder 3 so as to be able to reciprocate in the anti-insertion direction without using a tool or a finger. , The clamp body 2a may be enlarged in diameter so that the upright pieces 2b approach each other at the guide portion formed thereon.
Further, the shape of the tightening ring 2 is not limited to the illustrated example, and other shapes may be used.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows one Example of the pipe joint of this invention, (a) shows the state before inserting a conduit | pipe, (b) shows the state immediately after inserting a conduit | pipe, (c) is connection of a conduit | pipe. Indicates the state. In the same part notch perspective view, (a) shows the state before inserting the conduit, (b) shows the state immediately after inserting the conduit, and (c) shows the connected state of the conduit. (A) is an exploded perspective view showing a state where the diameter of the tightening ring is enlarged, (b) is a state where the diameter is reduced in a perspective view of the tightening ring, and (c) is a reverse direction of the tightening ring. It is the perspective view seen from. It is a perspective view which shows the other Example of the pipe joint of this invention, (a) shows the state before inserting a conduit | pipe, (b) shows the state immediately after inserting a conduit | pipe, (c) is the state of a conduit | pipe. Indicates the connection status. In the same part notch perspective view, (a) shows the state before inserting the conduit, (b) shows the state immediately after inserting the conduit, and (c) shows the connected state of the conduit. (A) is an exploded perspective view showing a state where the diameter of the tightening ring is enlarged, (b) is a state where the diameter is reduced in a perspective view of the tightening ring, and (c) is a reverse direction of the tightening ring. It is the perspective view seen from. It is a perspective view which shows the other Example of the pipe joint of this invention, (a) shows the state before inserting a conduit | pipe, (b) shows the state immediately after inserting a conduit | pipe, (c) is the state of a conduit | pipe. Indicates the connection status. In the same part notch perspective view, (a) shows the state before inserting the conduit, (b) shows the state immediately after inserting the conduit, and (c) shows the connected state of the conduit. (A) is an exploded perspective view showing a state in which the tightening ring and the sleeve are enlarged, (b) is a perspective view showing the tightening ring and the sleeve, and (c) is a reverse view of the sleeve. It is the perspective view seen from the direction. It is a perspective view which shows the other Example of the pipe joint of this invention, (a) shows the state before inserting a conduit | pipe, (b) shows the state immediately after inserting a conduit | pipe, (c) is the state of a conduit | pipe. Indicates the connection status. In the same part notch perspective view, (a) shows the state before inserting the conduit, (b) shows the state immediately after inserting the conduit, and (c) shows the connected state of the conduit. (A) is an exploded perspective view showing a state where the diameter of the tightening ring is reduced and the sleeve is enlarged, (b) is a state where the diameter is reduced in a perspective view of the sleeve, and (c) is a state where the sleeve is viewed from the opposite direction. FIG.

Explanation of symbols

A Pipe joint 1 Nipple 1a Outer peripheral surface 1b Annular recess 1c Annular seal 1d Nut 1e Connection 1f Screw
2 Clamping ring 2a Clamp body 2b Standing piece 2c Notch 2d Linking portion 3 Outer cylinder 3a Locking portion 3b Opening portion 3c Pipe insertion direction base end 4 Sleeve 4a Linking portion 4b Slotting 4c Engaging portion 4d Annular protrusion 4e Guide part 5 Annular body 6 Annular body B Conduit B1 Outer peripheral surface B2 Front end surface B3 Inner peripheral surface S Insertion space

Claims (3)

A nipple (1) and a tightening ring (2) provided around the nipple (1) are provided, and a conduit (B) inserted between the nipple (1) and the tightening ring (2). In the pipe joint in which the tightening ring (2) is deformed in diameter and the conduit (B) is pressed against the outer peripheral surface (1a) of the nipple (1) by its elastic force so as to be immovable.
The outer ring (3) provided outside the nipple (1) is supported by the fastening ring (2) so as to be movable in the insertion direction of the conduit (B). The outer cylinder (3) A locking portion (3a) for temporarily fixing the tightening ring (2) in a diameter-expanded state, and an opening portion (3b) for releasing the temporary fixing so that the tightening ring (2) is deformed to a reduced diameter. ) Is continuously formed in the insertion direction of the conduit (B), and the fastening ring (2) is movably locked to the locking portion (3a) in the tube insertion direction, A pipe joint characterized by moving the tightening ring (2) in the same direction in conjunction with the insertion of the conduit (B). The tightening ring (2) has a clamp body (2a) that is bent in an annular shape, and standing pieces (2b) formed at both ends thereof, and the circumferential direction of these standing pieces (2b) The clamp body (2a) is enlarged in diameter by moving to the above, and the upright piece (2b) is moved from the open part (3b) of the outer cylinder (3) toward the locking part (3a), thereby The hose coupling according to claim 1, wherein the tightening ring (2) is arranged so as to be temporarily fixed to the engaging portion (3a) of the outer cylinder (3) in an expanded state. A sleeve (4) capable of reducing the diameter is provided inside the tightening ring (2), and the tightening ring (2) and the sleeve (4) are movably supported in the insertion direction of the conduit (B). An insertion space (S) into which the conduit (B) is inserted is formed between the sleeve (4) and the nipple (1), and the sleeve (4) is interlocked with the insertion of the conduit (B). And the tightening ring (2) are moved in the same direction.

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