JPH08100878A - Pipe joint and wateproof connecting pipe joint - Google Patents

Abstract

PURPOSE: To provide a pipe joint making manufacture capable without restriction by a material quality to be capable of quickly connecting a pipe without twisting a connected pipe when connected. CONSTITUTION: In a cylindrical joint main unit 1 having an internal peripheral flange 10, a notched annular stopper ring 4 is set to insert a connected pipe 5, and in a clearance between the internal periphery of the joint main unit 1 and the stopper ring 4, by pressing in a fastening cylinder 2 having tapered internal peripheral surface 20 broaden toward a point end direction, the stopper ring 4 is pressed to the periphery of the connected pipe 5, simultaneously with stopping in a coming-off stopping manner a stop means 2a, formed in the fastening cylinder 2, to a stop means 1a formed in the joint main unit 1. When necessary, a cylindrical packing 3 is set in the joint main unit 1 prior to setting the stopper ring 4 when set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for connecting pipes such as electric wire pipes, and a pipe joint for waterproof connection intended for pipes requiring waterproof (watertight) connection such as water supply and drainage pipes. More specifically, the present invention relates to a pipe joint for a corrugated pipe having a corrugated cross-section on the outer periphery or a flexible pipe made of synthetic resin having a smooth surface.

[0002]

2. Description of the Related Art To connect a drainage pipe or the like, the end of the drainage pipe is inserted into the insertion port of a cylindrical pipe joint having an insertion port at the end, and the outer periphery of the end of the drainage pipe and the insertion are inserted. By adhering the inner circumference of the mouth with an adhesive, a means for waterproofly connecting the connecting portion and fixing the pipe and the joint is adopted. This pipe joint is made of synthetic resin.

A waterproof joint for a spiral grooved pipe having flexibility is disclosed in, for example, FIG.
No. 390) has been proposed. FIG.
The pipe joint No. 4 is attached to the end of the spiral corrugated pipe 8 and a short cylindrical joint body 6 having a male screw 60 formed on the outer periphery of the end, a cap nut 7 screwed to the male screw 60. And a rubber packing 9 having a cylindrical shape. Joint body 6
The inner periphery of the end portion of the rubber packing 9 is formed in a taper surface 61 that widens from the inside toward the end portion. On the other hand, the rubber packing 9 has an inner peripheral shape that conforms to the spiral corrugated tube 8 and an outer peripheral shape thereof. It is formed so as to correspond to the tapered surface 61. This pipe joint is equipped with a rubber packing 9 and a spiral wave pipe 8
The end portion of is inserted into the end of the joint body 6, and the cap nut 7 is screwed onto the male screw 60 to waterproofly connect the pipe 8 to the state shown in the figure.

[0004]

As described above, the means for inserting the end portion of the pipe into the insertion port of the pipe joint and adhering the insertion port and the pipe end portion to each other is that the material of the pipe joint and the pipe to be connected is Since it is limited to those that can be bonded with an adhesive, it is not possible to manufacture a pipe joint with a cheaper synthetic resin. On the other hand, FIG.
Although such a pipe joint does not have the above-mentioned problem, when the cap nut 7 is screwed onto the male screw 60 of the main body 6, the rotational force of the pipe nut 7 contacts the pipe 8 through the rubber packing 9. There was a problem that the pipe 8 was easily twisted. Also,
Since the cap nut 7 has a large resistance to be turned, it cannot be sufficiently tightened, watertightness is easily impaired, and it is troublesome to screw the cap nut 7 in.
An object of the present invention is to improve the above-mentioned drawbacks, to manufacture at low cost without being restricted by the material, and to quickly connect the connected pipes so that the connected pipes are not twisted at the time of connection. Furthermore, it is to provide a pipe joint capable of making a waterproof connection.

[0005]

According to a first aspect of the present invention, there is provided a cylindrical joint body (1) having an inner peripheral collar (10) at a position extending from an end portion by a predetermined length, and the end portion is widened toward the front end. A tightening cylinder (2) having a tapered inner peripheral surface (20) inserted into the joint body (1), and an outer circumference inscribed in the tapered inner peripheral surface (20) of the tightening cylinder (2). A stopper ring (4) having a surface and a ring-shaped elastic notch with an inner diameter that can be attached to the outer periphery of the connected pipe (5),
The tightening cylinder (2) is locked to the joint body (1) and the tightening cylinder (2) in a state in which the tightening cylinder (2) is inserted into the joint body (1). It is a pipe joint provided with locking means (1a, 2a).

According to a second aspect of the invention, in addition to the pipe joint of the first aspect, the tapered inner peripheral surface (2) of the tightening cylinder (2) is further provided.
0) has an outer peripheral surface inscribed therein, and a flange (30) abutting against the inner peripheral flange (10) of the joint body (1) on the inner periphery of the tip end portion, and the end portion of the connected pipe (5). It is a pipe joint for waterproof connection, which is provided with a cylindrical packing (3) having an inner diameter into which can be inserted.

The joint body is, for example, vinyl chloride, AB
It is molded from S (acrylonitrile-butadiene-styrene copolymer), polypropylene, polyethylene or the like. The tightening cylinder and the stopper ring are, for example, AB
It is made of S, polypropylene, polyethylene or the like. The packing is made of, for example, rubber or neopreon rubber or other synthetic rubber.

When the pipe to be connected is made of a flexible material, an inner cylinder having an outer diameter slightly smaller than the inner diameter of the pipe to be connected is continuously provided on the inner peripheral flange of the joint body toward the end portion. Is preferred. When the heat insulation tube is adhered to the pipe to be connected, it is preferable to form a flange on the proximal end side of the tightening cylinder and to form an insertion portion into which the heat insulation tube is inserted at the time of connection.

[0009]

In order to connect the connected pipe (5) to the joint body (1) by the pipe joint of claim 1, first, the stopper ring (4) is set inside the joint body (1) and the tightening is performed. A part of the cylinder (2) is inserted into the gap between the joint body (1) and the stopper ring (4). Then, the pipe to be connected (5) is passed through the tightening cylinder (2) and the stopper ring (4).
The end of the pipe into the joint body (1), and the pipe end is the joint body (1).
After being inserted until it comes into contact with the inner collar, the tightening cylinder (2) is strongly pushed into the joint body (1).

When the tightening cylinder (2) is strongly pushed into the joint body (1), the notched annular stopper ring (4) is contracted by the tapered inner peripheral surface (20) of the tightening cylinder (2) to be connected. It is pressed firmly against the tube (5). As a result, the connected pipe (5) is connected to the joint body (1) in a state in which it cannot come out. Further, the fitting means (1a, 2a) locks the joint body (1) and the tightening cylinder (2) in a state of preventing them from coming off.

In order to connect the pipe to be connected (5) to the joint body (1) by the waterproof connection pipe joint of claim 2, the packing (3) and the stopper ring (4) are joined to the joint body (1).
And the tightening cylinder (2) is partially inserted into the gap between the joint body (1) and the stopper ring (4). Then, when the operation is performed in the same manner as the pipe joint of claim 1, the packing (3) and the notched annular stopper ring (4) are reduced in diameter by the tapered inner peripheral surface (20) of the tightening cylinder (2) to be connected. It is pressed firmly against the tube (5). As a result, the connected pipe (5) is connected to the joint body (1) in a watertight manner and in a state in which it does not come out. Further, the fitting means (1a, 2a) locks the joint body (1) and the tightening cylinder (2) in a state of preventing them from coming off.

According to the pipe joint of the present invention, the pipe to be connected can be connected to the joint body with one touch without twisting and the bonding is not required. Becomes wider.

In the pipe joint of the present invention, for example, one end of the joint body is formed with a locking means, the other end is formed with a socket, and the socket is connected to a box. If the pipe to be connected is connected to the end of the pipe in the above-mentioned manner, the box and the pipe to be connected are connected via the joint body. On the other hand, by forming the locking means as described above at both ends of the joint body, and preparing two sets of the tightening cylinder and the stopper ring, or the tightening cylinder, the stopper ring, and the packing, respectively, according to the above-mentioned procedure,
Two connected pipes can be connected to each other via the joint body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a waterproof connecting pipe joint according to the present invention will be described with reference to FIGS.

(Embodiment 1) FIGS. 1 to 9 show an embodiment in which a drainage pipe having corrugated unevenness parallel to the circumferential direction is used as the pipe to be connected. The short cylindrical joint body 1 is integrally formed of a synthetic resin such as vinyl chloride, ABS, polypropylene or polyethylene. An inner peripheral flange 10 is formed at a position that is inserted into a predetermined length at one end of the joint body 1, and an inner cylinder 13 having a diameter slightly smaller than the inner diameter of the pipe 5 to be connected is formed in the inner peripheral portion of the inner peripheral flange 10. It is formed so as to extend toward the one end of the joint body 1. A small-diameter socket 12 is formed on the other end of the joint body 1, and the socket 12 is connected to a box (not shown) by a suitable means.

The joint body 1 has a tightening cylinder 2 to be described later.
In the state in which is inserted into the joint body 1, the locking means 2a of the tightening cylinder 2 and the locking means 1a that is locked in the retaining state are provided. In the pipe joint of this embodiment, the locking means 1a includes locking projections 11 and
11 '. As shown in FIGS. 1 to 5, on the outer peripheral surface of the joint main body 1, locking projections 11 and 11 ′ are formed in two stages at six positions at regular angular intervals in the circumferential direction, and two protrusions at opposite positions are provided. On the tops of the locking projections 11 and 11 'of the set, there are formed ridges 14 (FIGS. 3 and 4) having an arcuate cross section along the tube axis direction. These locking projections 11, 1
The width w1 of 1 '(FIG. 4) is defined by the adjacent locking protrusions 11 and 11'.
It is set to be smaller than the mutual interval w2.

Polypropylene, polyethylene or ABS
The tightening cylinder 2 formed of, for example, is the joint body 1
A tapered inner peripheral surface 20 is formed to have an outer diameter that can be inserted into one end of the inner peripheral surface of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall of the inner wall. In the pipe joint of this embodiment, the locking means 2a of the tightening cylinder 2 is composed of a locking arm 22 having a locking claw 23 at its tip as described below.

A flange 2 is provided on the outer circumference of the tightening cylinder 2 on the base end side.
6 are integrally formed on the flange 21. As shown in FIGS. 6 and 3, the six locking arms 22 are covered with the joint body 1 and the same number of guide arms 24 without locking claws.
And are formed alternately at substantially equal angular intervals. Locking claws 23 that are locked with the locking protrusions 11 and 11 ′ are formed inside the front end of each locking arm 22. In this embodiment, the width w (FIG. 6) of each locking arm 22 is substantially the same as the width w1 (FIG. 4) of each locking projection 11, and the interval w ′ between each locking arm 22 (FIG. 6) is each locking projection 1
It is almost the same as the interval w2 (FIG. 4). As shown in FIG. 6, inside the two locking arms 22 facing each other, a groove 25 having an arcuate cross-section that can guide the ridges 14 of the locking projections 11 and 11 'is formed. 22
A similar groove 26 is formed inside the guide arms 24 on both sides of. A marking (not shown) is displayed or formed on the outer surface of the locking arm 22 having the groove 25, and the locking projections 11 and 11 ′ are formed at the time of connecting operation of the connected pipe 5 described later.
It is preferable that the ridge 14 and the groove 25 of the locking arm 22 are easily aligned with each other. A window hole 27 is formed in the flange 21 of this embodiment at a portion corresponding to the locking arm 22 as shown in FIG.

The flange 21 and the arms 22 and 24 of the tightening cylinder 2 in this embodiment have a substantially cylindrical shape as a whole, and the locking arm 22 and the guide arm 24 have a tip portion as shown in FIG. Are formed so as to be alternately positioned via slits 28 having a slit shape along the base end direction. The slits 28 in this embodiment do not reach the flange 21, but
It may be formed to reach up to.

The packing 3 formed of neoprene rubber has a short cylindrical shape as shown in FIG. 8, and its inner diameter is formed to be slightly larger than the outer diameter of the pipe 5 to be connected. A flange 30 is formed inside one end of the packing 3 so as to contact the inner peripheral flange 10 of the joint body 1, and the outer peripheral surface thereof is a tapered surface 31 inscribed in the tapered inner peripheral surface 20 of the tightening cylinder 2. Is formed in. The tapered surface 31 is formed so that its diameter gradually increases as it approaches the flange 30.

Polypropylene, polyethylene or ABS
The stopper ring 4 formed by, for example, is an annular shape having a notch portion 42 as shown in FIG. 9, and its inner diameter is formed slightly larger than the outer diameter of the connected pipe 5. The outer peripheral surface of the stopper ring 4 is formed as a tapered surface 41 that is inscribed in the tapered inner peripheral surface 20 of the tightening cylinder 2, and a projection 40 that is continuous in the circumferential direction is formed at the inner edge of one end. The tapered surface 41 is formed so that the diameter increases as it approaches the end.

A corrugated connected pipe 5 is connected to the joint body 1 of this embodiment in the following manner. First, the joint body 1
The packing 3 and the stopper ring 4 are inserted in that order and set. Next, each locking protrusion 11, 1 of the joint body 1
1'and the respective locking arms 22 of the tightening cylinder 2 are aligned along the tube axis direction, and the ridges 14 of the locking projections 11 and 11 '.
Is guided to the groove 25 of the locking arm 22, the tightening cylinder 2 is pushed into the gap between the inner circumference of the end of the joint body 1 and the packing 3 and the stopper ring 4. At this time, the locking arm 22
2 has elasticity, the locking claw 23 is locked on the locking projection 11 'by overcoming the locking projection 11' on the first step, and
As described above, the tightening cylinder 2 is temporarily fixed to the joint body 1 in a state where it is not rotated. Next, the end portion of the connected pipe 5 is connected to the joint body 1 and the pipe end thereof is the flange 30 of the packing 3.
Insert it until it comes into contact with the inner peripheral flange 10 of the joint body 1 via. At the time of this insertion, the inner cylinder 13 of the joint body 1 serves as an insertion guide. When the tightening cylinder 2 is further pushed into the joint body 1 from this state, as shown in FIGS. 1 and 3, the locking claws 23 of the locking arms 22 are prevented from rotating to the locking protrusions 11 of the second stage, and It is locked in a state where it does not come off. At the same time, the packing 3 and the stopper ring 4 are reduced in diameter from the outer peripheral direction in the axial direction of the connected pipe 5 by the tightening cylinder 2. As a result, the packing 3 is brought into close contact with the outer periphery of the end of the connected pipe 5 to be in a watertight state, and the protrusion 40 on the inner periphery of the stopper ring 4 is caught by one of the corrugated irregularities of the connected pipe 5. As a result, the pipe 5 to be connected is connected to the end of the joint body 1 so as not to come off.

When removing the connected pipe 5 from the joint body 1,
Follow the procedure below. When the tightening cylinder 2 and the flange 21 are strongly turned to the right or left by about 30 ° from the state shown in FIG. 1 and FIG. 3, the protrusions of the locking protrusions 11 and 11 ′ engaged in the groove 25 of the locking arm 22 are projected. The strip 14 is disengaged from the groove 25, and the convex strip 14 enters the groove 26 of the adjacent guide arm 24. When the tightening cylinder 2 is pulled out from the joint body 1 in this state, the connected pipe 5 is easily detached from the joint body 1.

In the pipe joint of this embodiment, as described above, the packing cylinder 3 and the stopper ring 4 are accommodated in the tightening cylinder 2, and the tightening cylinder 2 is pushed straight into the joint body 1 in the axial direction. The packing 3 and the stopper ring 4 and the connected pipe 5 can be properly and firmly brought into close contact with each other. Therefore, the connected pipe 5 can be connected to the joint body 1 almost in one touch without being twisted, and preferable water tightness between the connected pipe 5 and the pankin 3 can be obtained, and the connected pipe can be obtained. No. 5 is a preferable retaining state. Since the pipe joint of this embodiment does not connect the connected pipe 5 to the joint body 1 by adhesion, the degree of freedom in selecting the material of the joint is wide, and a synthetic resin of a material that is cheaper and easier to mold is used. can do. In the pipe joint of this embodiment, as described above, at least one of the locking projections 11 and 11 'and the locking arm 22 includes the ridge 14 and the groove 25.
Since they are engaged with each other and are prevented from rotating, the locking arm 22 and the locking projections 11 and 11 'can be disengaged when the tightening cylinder 2 is pushed into the joint body 1 and after being pushed. Absent. As described above, when the flange 21 is rotated by a predetermined angle in one direction, the ridges 14 of the locking projections 11 and 11 'engage with the groove 26 of the adjacent guide arm 24 and are guided, so that the tightening cylinder 2 is It can be pulled out very smoothly from the joint body 1. The pipe joint of this embodiment has a joint body 1
Since the locking projections 11 and 11 ′ of the locking arm have two steps, the locking claw 23 of the locking arm 22 is temporarily fixed to the locking projection 11 ′ of the first step, and in this state, the main body 1 and the locking arm 22 It is possible to confirm whether or not the set state with and is correct, and then perform proper and full-scale locking. Further, each locking claw 23 is temporarily locked to the locking projection 11 'of the first step, and the joint body 1, the tightening cylinder 2, the packing 3 and the stopper ring 4 can be sold as a set, which is convenient. is there. Further, since the inner cylinder 13 is formed inside the joint body 1, the inner cylinder 13 serves as a guide when inserting the connected pipe 5,
The connected pipe 5 can be smoothly inserted.

(Embodiment 2) The pipe joint of the above-mentioned embodiment is also implemented in the case where the flexible connected pipe 5 having a smooth surface is waterproofly connected to the end portion of the joint body 1 as shown in FIG. can do. FIG. 10 is a cross-sectional view showing a connection state almost similar to that of FIG. 1, but in this embodiment, the projection 40 of the stopper ring 4 is fitted into the surface of the connected pipe 5 so that the connected pipe 5 is connected. Is locked. Other configurations and operational effects of the pipe joint of the embodiment shown in FIG. 10 are almost the same as those of the pipe joint of the embodiment shown in FIG. 1, and therefore their explanations are omitted.

(Embodiment 3) The connected tube 5 is the heat retaining tube 5.
0 (FIG. 11), the end portion of the heat retaining tube 50 is cut off, and the end portion of the connected pipe 5 exposed from the heat retaining tube 50 is removed in the same manner as in FIG. 1 or FIG. Can also be connected to
It is preferable to configure as follows. In the pipe joint of FIG. 11, a large-diameter cylindrical tube insertion portion 29 extending on the opposite side of the locking arm 22 is formed on the flange 21 of the tightening cylinder 2, and the connected pipe is connected to the joint body 1 in the following manner. Connect the ends of 5. That is, the end portion of the heat insulating tube 50 is cut off to expose the end portion of the connected pipe 5, the stopper ring 4 and the packing 3 are attached to the end portion of the connected pipe 5 in order, and the heat is kept inside the tube insertion portion 29. With the tube 50 inserted, the tightening cylinder 2 is pushed into the joint body 1 as in the above-described embodiment. In the connection state of the joint body 1 and the connected pipe 5, the heat insulating tube 50 is held in the tube insertion portion 29. Other configurations, functions, and effects of the pipe joint of the embodiment of FIG. 11 are almost the same as those of the pipe joint of the embodiment of FIG. 1, so description thereof will be omitted.

(Embodiment 4) FIG. 12 shows a modification of the joint body 1. In the joint body 1 of this embodiment, a screw 12a is formed on the outer periphery of the socket 12, and before connecting a pipe to be connected (not shown) to the joint body 1, the joint body 1 is turned to turn the socket 12 into a box (not shown). In order to connect to the inner peripheral flange 10 of the joint body 1, a set portion (for example, a hexagon) 12b of a screw tool (not shown) is formed on the outer surface of the inner peripheral collar 10. Since the inner cylinder 13 as shown in FIG. 1 is not formed inside the joint body 1 of this embodiment, the joint body 1 is suitable when the connected pipe (not shown) has a small expansion / contraction property in the pipe axial direction. Other configurations and operational effects of the embodiment of FIG. 12 are almost the same as those of the embodiment of FIG. 1, and therefore their explanations are omitted.

(Embodiment 5) Although the packings 3 are provided in the pipe joints of the above-mentioned respective embodiments, in the pipe joints which do not require much waterproofing, as in the pipe joint of the embodiment shown in FIG. The packing can be omitted. In the pipe joint of this embodiment, when the tightening cylinder 2 is pushed in as described above,
The diameter of the stopper ring 4 is reduced so as to come into close contact with or be fitted into the pipe to be connected, so that the pipe 5 to be connected is in a state in which it does not come off from the joint body 1. When the connected pipe 5 is a soft straight pipe, a certain degree of waterproofness can be obtained in the connected state shown in the figure. If the connected pipe 5 is soft, the stopper ring 4
Although there is a possibility that the pipe 5 will be deformed by pressure contact, in this embodiment, since there is the inner cylinder 13 in which the pipe 5 is inscribed, such deformation can be prevented. Furthermore, because of the inner cylinder 13,
Since the pipe 5 is sandwiched between the inner cylinder 13 and the stopper ring 4 and brought into close contact with them, there is also an advantage that the watertightness is improved. Other configurations and operational effects of the embodiment of FIG. 13 are almost the same as those of the embodiment of FIG. 1, and therefore their explanation is omitted.

In each of the above embodiments, the socket 1
If, instead of 2, the same locking protrusions 11 as described above are formed on the outer circumferences of both ends of the joint body 1 and two sets of tightening cylinders 2, packings 3 and stopper rings 4 each having the same structure are prepared, In the same manner as in each of the embodiments, the joint body 1
The two pipes to be connected can be connected to each other in a watertight state via.

(Other Technical Ideas) The technical idea of the present invention which can be understood from the above-described embodiment includes the following pipe joints in addition to those described in the claims. The first is the pipe joint according to claim 1 or 2, wherein the projection 40 is provided on the inner surface of the stopper ring 4. Thus, by providing the protrusion 40 on the inner surface of the stopper ring 4, in the above-mentioned connected state, in the case where the pipe 5 to be connected is a corrugated pipe having irregularities parallel to the circumferential direction of the pipe, the stopper 40 is provided. The protrusion 40 on the inner circumference of the ring is caught on any one of the corrugated irregularities on the outer circumference of the tube. On the other hand, when the pipe to be connected is a pipe made of a relatively soft synthetic resin or rubber and having a smooth outer peripheral surface, the projection 40 on the inner periphery of the stopper ring fits into the peripheral surface of the pipe. Stuck in the state.

Secondly, in the pipe joint according to claim 1 or 2, a flange 21 is formed on the outer periphery of the tightening cylinder 2 on the base end side, and the locking means 1a, 2a are attached to the joint body 1. The elastic locking arm 22 formed on the flange 21 in a state of extending in the direction of and extending over the joint main body 1 and the elastic arm in a state of being located on the same circumference corresponding to the locking arm 22. Locking projections 11 and 11 'formed in one or two steps on the outer circumference of the joint body 1 along the pipe axis direction.
And a locking claw 23 formed on the locking arm 22 so that when the tightening cylinder 2 is inserted into the joint body 1, the locking projections 11 and 11 'are locked in a retaining state.
It is a pipe joint composed of and. According to this pipe joint, in the connected state of the joint body 1 and the connected pipe 5, the engagement claw 23 of the engagement arm 22 and the engagement projections 11 and 11 ′ formed on the outer periphery of the engagement body 1 are provided. The joint body 1 and the connected pipe 5 are in a state of being prevented from coming off. When the locking projections 11 and 11 ′ of the joint body 1 are formed in two stages along the pipe axis direction, the locking projections 11 ′ of the first stage are formed in the process of inserting the tightening cylinder 2 into the joint body 1. The locking claw 23 of the locking arm 22 is locked and temporarily fixed, and in this temporarily fixed state, it is confirmed whether or not the state of the connected pipe 5 on the verge of connection is correct, and then proper and full-scale locking is performed. be able to. Further, it is convenient because the respective parts can be sold as a unit in the temporarily fixed state.

Thirdly, in the second pipe joint,
At least one of the locking protrusions 11 and one of the locking arms 22 is formed with a groove 25 along the tube axis direction, and on the other of them, a convex strip along the tube axis direction which is guided and engaged with the groove 25. Alternatively, it is a pipe joint in which the convex portion 14 is formed. According to this pipe joint, when the tightening cylinder 2 is pushed into the end portion of the joint body 1, the groove 25 and the ridge or the protrusion 14 serve as a guide for the pushing operation. Therefore, the tightening cylinder 2 is pushed into the joint body 1 smoothly, and the tightening cylinder 2 is in a state of being prevented from rotating with respect to the joint body 1.

Fourthly, in any one of the first to third pipe joints, the inner peripheral flange 10 of the joint body 1 has an outer diameter slightly smaller than the inner diameter of the connected pipe 5 toward the end portion. It is a pipe joint in which an inner cylinder 13 having a diameter is formed. In this way, if the inner cylinder 13 as described above is formed on the inner peripheral flange 10 of the joint body 1, the tightening cylinder 2 is inserted into the joint body 1 even if the connected pipe 5 is made of a flexible material. At this time, it is possible to prevent the tube 5 from shrinking in the tube radial direction, and the adhesion between the tube 5 and the packing 3 is not impaired.

Fifth, in the second or third pipe joint, is a pipe joint in which the locking arms 22 are formed on the flange 21 of the tightening cylinder 2 at intervals wider than the width thereof. According to this pipe joint, when the tightening cylinder 2 is turned by a predetermined angle in any one direction while holding the part of the funnel 21,
The locking claw 23 of the locking arm 22 is disengaged from the locking projection 11 on the outer periphery of the joint body 1, and in this state, the tightening cylinder 2 is moved to the joint body 1.
The connected pipe 5 can be easily removed from the joint body 1 by pulling it out from the joint body 1.

[0035]

As described above, in the pipe joint according to the present invention, the stopper ring and the pipe to be connected are properly and firmly pressed by pushing the tightening cylinder into the joint body while the stopper ring fits in the tightening cylinder. Can be closely attached. Therefore, since the pipe to be connected is connected to the joint body without being twisted, it can be connected by one-touch operation, and the connecting work is simple. Then, the pipe to be connected is in a preferable retaining state. Moreover, according to the pipe joint using the packing,
When the tightening cylinder is pushed in, the packing is pressed against the pipe to be connected together with the stopper ring, so that preferable water tightness is obtained. Therefore, the waterproof connection can be made with one touch without twisting the connected pipe.

[Brief description of drawings]

FIG. 1 is a half-cut sectional view of a pipe joint according to a first embodiment of the present invention in a connected state.

FIG. 2 is a half sectional view showing a state in which a pipe to be connected is inserted into a pipe joint in which a main body and a tightening cylinder are temporarily fixed in the embodiment of FIG.

FIG. 3 is a partial enlarged cross-sectional view taken along the arrow AA of FIG.

FIG. 4 is a right side view of a joint body in the pipe joint of the embodiment.

5 is a half sectional view of the joint body of FIG. 4 taken along the arrow BB.

FIG. 6 is a left side view of a tightening cylinder in the pipe joint of the embodiment.

FIG. 7 is a right side view of a tightening cylinder in the pipe joint of the embodiment.

FIG. 8 is a half sectional view of a packing in the pipe joint of the embodiment.

9A and 9B are views showing a stopper ring in the pipe joint of the embodiment, in which FIG. 9A is a right side view thereof, and FIG. 9B is a partially enlarged sectional view thereof.

FIG. 10 is a half-cut sectional view of a pipe joint according to another embodiment of the present invention in a connected state.

FIG. 11 is a half cutaway view of a pipe joint according to another embodiment of the present invention in a connected state.

FIG. 12 is a half-cut sectional view showing a modified example of the joint body of the pipe joint according to the present invention.

FIG. 13 is a half cutaway view showing a pipe joint according to still another embodiment of the present invention in a connected state.

FIG. 14 is a sectional view of a conventional waterproof connection pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint body 10 Inner circumference collar 1a Locking means 11, 11 'Locking protrusion 12 Socket 12a Screw 12b Screw tool setting part 13 Inner cylinder 14 Convex ridge 2 Tightening cylinder 20 Taper inner peripheral surface 2a Locking means 21 Flange 22 Engagement Stop arm 23 Locking claw 24 Guide arm 25, 26 Groove 27 Window 28 Slit 29 Tube insertion part 3 Packing 30 Flange 31 Tapered surface 4 Stopper ring 40 Protrusion 41 Tapered surface 42 Notched part 5 Connected pipe 50 Heat insulation tube 6 Joint body 60 Male screw 61 Tapered surface 7 Cap nut 8 Tube with spiral wave 9 Rubber packing

Claims (2)

[Claims] 1. A cylindrical joint main body (1) having an inner peripheral flange (10) at a position extending a predetermined length from the end portion, and a tapered inner peripheral surface (2) which is divergent toward the tip direction.
0) and having a tightening cylinder (2) to be inserted into the joint body (1) and an outer peripheral surface inscribed in the tapered inner peripheral surface (20) of the tightening cylinder (2). Stopper ring (4) having an annular notch with an inner diameter that can be attached to the outer periphery of (5)
The joint body (1) and the tightening cylinder (2) are provided with a state where the tightening cylinder (2) is inserted into the joint body (1) so that the tightening cylinder (2) does not come off. A pipe joint comprising locking means (1a, 2a) for locking. 2. The pipe joint according to claim 1, which has an outer peripheral surface inscribed in the tapered inner peripheral surface (20) of the tightening cylinder (2), and has an inner peripheral flange of the joint body (1) at the inner periphery of the tip portion. For waterproof connection, characterized in that a cylindrical packing (3) having a flange (30) abutting against (10) and having an inner diameter into which the end of the connected pipe (5) can be inserted is provided. Pipe fittings.