JP3611902B2 - Plastic pipe fittings - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a joint for resin pipes that is inserted into and connected to a resin pipe.
[0002]
[Prior art]
For example, a long resin hose is manufactured by using a resin hose manufacturing core made of a hard resin round bar, and extruding and coating the resin on the outer periphery of the resin hose manufacturing core. The core for manufacturing the resin hose is removed. The resin hose manufacturing core 1 is manufactured as a standard one as shown in FIG. 6, and a plurality of these are connected to a required length.
[0003]
The connection of these resin hose manufacturing cores 1 has conventionally been performed using a metal resin pipe joint 2 and a resin pipe 3 as shown in FIG. That is, the resin pipe joint 2 has a threaded portion 5 projecting from one end of a disk-shaped joint base 4 having the same outer diameter as the core 1 and a thickness insertion portion 7 entering the hole 6 of the resin pipe 3 at the other end. It was the structure with. Such a joint 2 for a resin pipe has a threaded portion 5 screwed into an end portion of a resin hose manufacturing core 1 and an insertion portion 7 inserted into a hole 6 of a resin pipe 3 having the same outer diameter as the core 1. Then, it was bonded with the adhesive 8 and connected to the resin pipe 3. By performing such a connection operation at the ends of both of the resin hose manufacturing cores 1, the resin hose manufacturing cores 1 adjacent to each other through the connection body 9 using the resin pipe joint 2 and the resin pipe 3 are used. I was connecting.
[0004]
The resin hose A is formed on the outer periphery of the resin hose manufacturing core 1 by extruding and coating the resin on the outer periphery of the resin hose manufacturing core 1 connected to the required length in this way. After completion of the manufacturing operation of the resin hose A, the resin hose manufacturing core 1 is disassembled at the connection body 9 and returned to the original length. At this time, conventionally, the connecting portion 9 is broken by hitting the bonded portion of the adhesive 8 with a hammer, and the insertion portion 7 is separated from the resin pipe 3.
[0005]
[Problems to be solved by the invention]
However, in the connection method using the conventional resin pipe joint 2 and the resin pipe 3, (a) the adhesive strength varies depending on the application state of the adhesive 8, and (b) the adhesive 8 is used, Connection work is troublesome. (C) Since the adhesive 8 is used, it takes time to separate the connection body 9. (d) Since the adhesive 8 is used, it takes time until the adhesion state is stabilized, and it is continuous. There was a problem that the work could not be carried out.
[0006]
The objective of this invention is providing the coupling for resin pipes which can perform the connection with respect to a resin pipe, without using an adhesive agent.
[0007]
[Means for Solving the Problems]
A resin pipe joint according to the present invention includes a joint base, a joint core incorporated in the joint base, and a plurality of locking claws in the circumferential direction incorporated in the joint base at the outer periphery of the joint core. Each of the locking claws is pushed by the inner surface of the hole of the resin pipe when inserted into the hole of the resin pipe. When the diameter is reduced and inserted into the resin pipe, the engaging claw portions are engaged with the inner surface of the resin pipe by an elastic action in the diameter increasing direction, and the joint core body has a distal end. The outer periphery has a sealing means for sealing a portion in contact with the inner surface of the resin pipe on the outer periphery. When pressure fluid is fed into the resin pipe, it moves backward to move each locking claw portion. And a head having a reduced diameter.
[0008]
As described above, the joint base, the joint core incorporated in the joint base, the outer circumference of the joint core, the joint base, and a plurality of latching claw portions in the circumferential direction are provided. When the claw part is in a diameter-expanded state due to an elastic action in the diameter-expanding direction and is inserted into the hole of the resin pipe, the claw part is pressed by the inner surface of the hole of the resin pipe to reduce the diameter of each locking claw and In the state of being inserted into the pipe, each locking claw is provided with a diameter expanding chuck that is locked to the inner surface of the resin pipe by an elastic action in the diameter expanding direction. When inserted from, each locking claw is automatically reduced in diameter by being pushed by the inner surface of the hole in the resin pipe, and does not hinder insertion into the resin pipe. Each latching claw received is locked to the inner surface of the hole in the resin pipe. Each locking pawl portion is fit retaining bites into the inner surface of the plastic pipe and pulling force is applied away from the type fittings. Thereby, according to the joint for resin pipes of this invention, it is not necessary to provide the waiting time until an adhesive agent hardens like the conventional example using an adhesive agent, and also a diameter expansion chuck is simply inserted in a resin pipe. Since it can be connected by one-touch operation, it can be connected efficiently.
[0009]
In addition, it is slidably supported at the tip of the joint core body, and has a sealing means for sealing a portion in contact with the inner surface of the resin pipe on the outer periphery, and retracts when pressure fluid is fed into the resin pipe. Since it has a head that retracts each locking claw and reduces its diameter, when pulling out the resin pipe joint from the resin pipe, the head is retracted by feeding pressure fluid into the resin pipe. Each locking claw portion can be pressed to reduce the diameter, and thereafter, the resin pipe joint can be pushed out of the resin pipe by the pressure of the pressure fluid. Therefore, extraction of the joint for resin pipes from the resin pipe can be performed easily and efficiently.
[0010]
The joint for resin pipes according to the present invention includes a joint base, a joint core, a diameter-enlarged chuck, a coil spring, a head, and a sealing means, and a pipe insertion cylinder portion projects from the joint base and the pipe is inserted. A bottomed hole is provided in communication with the cylindrical portion, and the joint core is columnar and is inserted concentrically with a chuck built-in space with respect to the inner wall of the bottomed hole of the joint base. A base is fixed to the bottom portion of the bottomed hole, and a chuck diameter increasing operation convex portion is provided at a portion protruding from the tip of the pipe insertion tube portion, and a portion between the chuck diameter increasing operation convex portion and the base portion is a chuck. In order to provide a relief recess for diameter reduction, it is formed as a small-diameter column part, and has a structure in which a head mounting part is provided at a location protruding ahead of the chuck diameter-expansion operation convex part. Made of metal and having a cyclic group A slit is inserted along the longitudinal direction at a predetermined interval in the circumferential direction in a further portion, and a plurality of elastic tongue pieces are provided, and locking claw portions are respectively provided on the outer end surfaces of these elastic tongue pieces, The outer surfaces of these locking claws are tapered outer surfaces whose height increases from the tip toward the rear, and the rear ends of these tapered outer surfaces are locking edges, and the tips of the respective locking claws The inner surface is a tapered inner surface whose height decreases from the front to the rear, and is incorporated in the chuck assembling space so as to be movable in the axial direction, and by the elastic force of the coil spring mounted between the bottomed holes. Advancing and urging the tapered inner surface of each locking claw portion against the chuck diameter increasing operation convex portion so that each locking claw portion is expanded in diameter, and the head is applied to the head mounting portion of the joint core body. Fits slidably and has a stopper hand And a taper inner surface that presses the locking claw portion in the diameter-reducing direction at an inclination angle that matches the inclination of the taper outer surface of the locking claw portion. The sealing means is supported on the outer periphery of the head so as to slidably contact the inner surface of the resin pipe and perform sealing.
[0011]
Thus, by providing the chuck diameter increasing operation convex portion on the joint core body, each engaging claw portion at the tip of the diameter expanding chuck is pressed against the chuck diameter increasing operation convex portion by the biasing force of the coil spring. The diameter of the pawl portion can be easily increased. In addition, the portion between the chuck diameter increasing operation convex portion and the base portion of the joint core body is formed as a small-diameter column portion to provide an escape concave portion for reducing the chuck diameter. The portion can be released, and the diameter of each locking claw can be easily reduced. Further, by providing each locking claw portion of the diameter expansion chuck at the tip of each elastic tongue piece, the diameter expansion and diameter reduction operation of each elastic tongue piece can be easily performed. Further, by providing a tapered outer surface whose height increases from the front end toward the rear portion on the outer surface of each locking claw portion, insertion into the resin pipe and pressing on the tapered inner surface of the head can be easily performed. In addition, by providing a tapered inner surface whose height decreases from the front to the rear on the inner surface of the front end of each locking claw, each locking claw can be easily made into a chuck expansion operation convex portion by the bias of the coil spring. It is possible to increase the diameter by riding.
[0012]
When the resin pipe joint is inserted into the hole of the resin pipe to be connected from the head side, each locking claw is pushed by the inner surface of the hole of the resin pipe, and the diameter expansion chuck moves backward against the elastic force of the coil spring. However, when the locking claw part is disengaged from the chuck diameter increasing operation convex part of the joint core body, the locking claw part is automatically reduced in diameter at the position of the relief diameter recess for chuck diameter reduction, and the insertion into the resin pipe is obstructed. When the insertion is completed, the locking claw portion of the diameter expansion chuck urged in the forward direction by the spring force of the coil spring rides on the chuck diameter expansion operation convex portion, and the locking edge portion is the inner surface of the resin pipe. When a pulling force is applied to pull the resin pipe away from the resin pipe joint from this state, the engaging claw portions are moved by the chuck diameter expansion operation convex portion of the joint core body that tries to move in the pulling direction. Inside the resin pipe pressed in the diameter expansion direction Bite to be fit retaining. Thereby, according to the joint for resin pipes of this invention, it is not necessary to provide the waiting time until an adhesive agent hardens like the conventional example using an adhesive agent, and also a diameter expansion chuck is simply inserted in a resin pipe. Since connection can be made reliably by a one-touch operation, connection work can be performed efficiently.
[0013]
In addition, the head is slidably fitted to the head mounting portion of the joint core body, and a sealing means is provided on the outer periphery of the head so as to slidably contact the inner surface of the resin pipe to seal the inside of the resin pipe. When the pressure fluid is fed into the head, the head is retracted by the pressure fluid pressure, and the retracting head retracts the diameter-enlarged chuck whose engaging claw bites into the inner surface of the resin pipe. When the taper inner surface of the head depresses the taper outer surface of the locking claw at a position deviated from the chuck diameter increasing operation convex portion of the core body, the diameter of each locking claw portion is reduced and the locking edge portion of the resin pipe is After detaching from the inner surface, the resin pipe joint can be pushed out of the resin pipe by the pressure of the pressure fluid. Therefore, extraction of the joint for resin pipes from the resin pipe can be performed easily and efficiently.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an example of an embodiment of a joint for resin pipes according to the present invention.
The joint for resin pipes of this example has a joint base 10 having the same outer diameter as that of the core 1 for manufacturing a resin hose described above, and a threaded portion 11 is projected from one end of the joint base 10. At the other end of the joint base 10, a pipe insertion cylinder portion 12 for projecting into the resin pipe 3 is provided. The outer peripheral surface of the pipe insertion cylinder portion 12 is a tapered surface that gradually increases from the tip toward the base, and can be easily inserted into the hole 6 of the resin pipe 3 described above. On the other end side of the joint base 10, a bottomed hole 13 is provided at the inner diameter of the pipe insertion cylinder portion 12.
[0015]
Further, the base 15 side of the columnar metal joint core body 14 is concentrically inserted into the other end side of the joint base 10 with a predetermined chuck mounting space 16 with respect to the inner wall of the bottomed hole 13. The screw portion 17 provided at the base end of the base portion 15 is fixed to the joint base 10 by screwing the screw portion 17 to the bottom portion of the bottomed hole 13. The joint core body 14 is provided with a ring-shaped chuck diameter increasing operation convex portion 18 at a portion protruding from the tip of the pipe insertion cylinder portion 12, and a portion between the chuck diameter increasing operation convex portion 18 and the base portion 15. Is a small-diameter column 20 for providing a relief recess 19 for reducing the diameter of the chuck. The joint core body 14 is provided with a small-diameter head mounting portion 21 at a location protruding ahead of the chuck diameter increasing operation convex portion 18. The head mounting portion 21 is provided with a head mounting long hole 22 in the longitudinal direction thereof.
[0016]
A cylindrical metal diameter expansion chuck 23 is incorporated in the chuck incorporation space 16. The diameter-enlarging chuck 23 is provided with a plurality of elastic tongues 26 in which slits 25 are inserted along the longitudinal direction at predetermined intervals in the circumferential direction at a portion ahead of the annular base 24, and the tips of these elastic tongues 26 are provided. Locking claw portions 27 protrude from the outer surface. The outer surfaces of these locking claws 27 are tapered outer surfaces 28 whose height increases from the front to the rear, and the rear ends of the tapered outer surfaces 28 are formed by a tapered outer surface 28 and a vertical surface 29. An edge portion 30 is formed, and a tapered surface 31 is formed on the vertical surface 29 so as to be lowered toward the rear portion and pressed in the diameter reducing direction at the tip of the pipe insertion tube portion 12. The inner surfaces of the front ends of the locking claws 27 are tapered inner surfaces 32 whose height decreases from the front to the rear.
[0017]
Such a diameter-expanded chuck 13 is fitted to the outer periphery of the joint core body 14 and is incorporated in the chuck assembling space 11 so as to be movable in the axial direction. A coil spring 33 is mounted between the bottomed hole 13 of the joint base 10 and the diameter-enlarged chuck 13 to press the diameter-enlarged chuck 13 in the forward direction by an elastic force.
[0018]
When the tapered inner surface 32 of each locking claw portion 27 of the diameter expanding chuck 13 that moves forward by the elastic force of the coil spring 33 hits the chuck diameter increasing operation protrusion 18, the coil spring 33 and the chuck diameter increasing operation protrusion 18 As shown in FIG. 1, the locking claw portions 27 are pushed outward and expanded in diameter, and the locking edge portions 30 of the locking claw portions 27 are outside the outer periphery of the pipe insertion cylinder portion 12. To protrude.
[0019]
A head 34 having an outer diameter substantially equal to the inner diameter of the resin pipe 3 described above is fitted to the head mounting portion 21 of the joint core body 14 so as to be movable in the axial direction. That is, the head 34 is provided with a mounting portion sliding hole 35 in which the head mounting portion 21 is slidably fitted in a predetermined range from the rear end to the front portion. A concave portion 36 is provided with an inner diameter into which the operation convex portion 18 can be inserted. A taper inner surface 37 is provided on the rear end surface of the head 34 at an inclination angle corresponding to the inclination of the taper outer surface 28 of the locking claw portion 27. Such a head 34 is supported by a stopper pin 38 that passes through the head 34 and passes through the head mounting long hole 22.
[0020]
Then, by the movement toward the rear end side of the head 34 that is movably fitted to the head mounting portion 21, the diameter expansion chuck 13 is pressed on the rear end surface of the head 34 and retracts against the elastic force of the coil spring 33, Each locking claw portion 27 is pressed by the taper inner surface 37 of the head 34 at a position where the locking claw portion 27 is disengaged from the chuck diameter increasing operation convex portion 18 of the joint core body 14. 27 has a reduced diameter, and its locking edge portion 30 is placed inside the outer peripheral surface of the pipe insertion tube portion 12.
[0021]
Further, a ring groove 39 is provided in the circumferential direction on the outer periphery of the head 34, and the ring groove 39 is provided with a sealing means 40 formed of an O-ring that slidably contacts the inner surface of the resin pipe 3 described above. It is incorporated. Further, a driver groove 41 for turning the threaded portion 11 of the joint core body 14 through the head 34 is provided on the tip surface of the head 34.
[0022]
Next, the connection process to the resin pipe 3 by such a joint for resin pipes is demonstrated with reference to FIG.3, FIG.4, FIG.5. In addition, the joint for resin pipes is screwed and connected to the end of the corresponding resin hose manufacturing core 1 in advance.
[0023]
The resin pipe joint is inserted into the hole 6 of the resin pipe 3 from the head 34 into the hole 6 of the resin pipe 3 as shown in FIG. By inserting the head 34, the sealing means 40 also moves while being in contact with the inner periphery of the resin pipe 3. Next, the taper outer surface 28 of each locking claw portion 27 of the diameter expansion chuck 23 hits the inner surface of the resin pipe 3, receives the pressing force, and the diameter expansion chuck 23 moves backward against the pressing force of the coil spring 33. The locking claw portion 27 is disengaged from the chuck diameter increasing operation convex portion 18 and escapes to the respective locking claw portion 27 escaping concave portions 19, whereby the tip end side of the diameter expanding chuck 23 is reduced in diameter as shown in FIG. If it will be in this state, the resin pipe 3 will pass the location of each latching claw part 27, and will be fitted by the outer periphery of the pipe insertion cylinder part 12. FIG. When the insertion is finished, the locking claw portion 27 of the diameter-expanding chuck 23 urged in the forward direction by the elastic force of the coil spring 33 rides on the chuck diameter-expanding operation convex portion 18 and the locking edge portion 30 is the resin pipe 3. The connection operation of the joint for resin pipes to the resin pipe 3 is completed. Such connection work is performed on both sides of the resin pipe 3. In this state, the resin hose manufacturing core 1 is connected by the resin pipe joint and the resin pipe 3 as described above, and the connection body 9 described above is formed.
[0024]
In this state, when a pulling force is applied to the resin pipe 3 to be pulled out from the joint for resin pipe, the chuck claw diameter increasing operation convex portion of the joint core body 14 in which each locking claw portion 27 is about to move in the pulling direction. 18 is pressed in the direction of diameter expansion, and as shown in FIG.
[0025]
Using the resin hose manufacturing core 1 connected to the required length in this way, the resin hose is manufactured as described above. After completion of the resin hose manufacturing operation, the resin hose manufacturing core 1 is returned to the original standard length by disassembling at the location of the connecting body 9 as described above.
[0026]
In this case, the resin pipe 3 is cut in the middle in the length direction, and a pressure fluid such as compressed air is fed into the resin pipe 3 from the cut end. When the pressure fluid is fed into the resin pipe 3, the head 34 having the sealing means 40 on the outer periphery and sealed between the inner surface of the resin pipe 3 moves backward as shown in FIG. 5 by the pressure of the pressure fluid. To do. When the head 34 moves backward, the taper inner surface 37 at the rear end of the head 34 abuts against the taper outer surface 28 of each locking claw 27 and presses the diameter expansion chuck 23 backward against the pressing force of the coil spring 33. When each locking claw portion 27 is disengaged from the chuck diameter increasing operation convex portion 18 due to the retraction of the diameter expanding chuck 23, the taper inner surface 37 of the head 34 presses the taper outer surface 28 of the locking claw portion 27. The claw portion 27 escapes into the recess 19 and is reduced in diameter, and the engaging edge portion 30 is detached from the inner surface of the resin pipe 3. When this state is reached, the resin pipe joint 2 is entirely retracted by the pressing force of the pressure fluid. Then, it is extruded out of the resin pipe 3.
[0027]
Therefore, the connection body 9 can be easily disassembled simply by feeding the pressure fluid into the resin pipe 3. The pressure fluid is not limited to a gas such as compressed air, but may be a liquid such as water.
[0028]
Of course, the joint for resin pipes of the present invention can be used for connecting short or long resin pipes in other applications.
[0029]
【The invention's effect】
According to the joint for resin pipes according to the present invention, the resin pipe and the joint for resin pipe can be connected by a one-touch operation such as inserting a diameter-enlarged chuck into the resin pipe, and for separation. In this case, the resin pipe joint can be pushed out of the resin pipe and separated by the pressure of the fluid fed into the resin pipe, so that the connection and separation of the resin pipe and the resin pipe joint can be performed efficiently. .
[Brief description of the drawings]
FIG. 1 is a partially longitudinal side view showing an example of an embodiment of a joint for resin pipes according to the present invention.
FIG. 2 is a side view of the diameter expansion chuck used in the example of FIG.
FIG. 3 is a partially longitudinal side view of the resin pipe joint of the present example in a state where the joint is connected to the resin pipe.
FIG. 4 is a partially longitudinal side view showing the operation of the diameter expansion chuck in a state where a tensile force is applied from the resin pipe to the resin pipe joint of this example.
FIG. 5 is a partially longitudinal side view showing a state in which the resin pipe joint of the present example is separated from the resin pipe.
FIG. 6 is a side view showing a connection state of a core for manufacturing a resin hose.
7 is a longitudinal sectional view of the connection body of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin hose manufacturing core 2 Resin pipe joint 3 Resin pipe 4 Joint base 5 Screw part 6 Hole 7 Insertion part 8 Adhesive 9 Connection body 10 Joint base 11 Screw part 12 Pipe insertion cylinder part 13 Bottomed hole 14 Joint core body 15 Base portion 16 Chuck installation space 17 Screw portion 18 Chuck diameter expansion convex portion 19 Relief recess portion 20 Small diameter column portion 21 Head mounting portion 22 Head mounting long hole 23 Diameter expanding chuck 24 Annular base 25 Slit 26 Elastic tongue 27 Locking claw portion 28 Tapered outer surface 29 Vertical surface 30 Locking edge portion 31 Tapered surface 32 Tapered inner surface 33 Coil spring 34 Head 35 Mounting portion sliding hole 36 Recessed portion 37 Tapered inner surface 38 Stopper pin 39 Ring groove 40 Sealing means 41 Driver groove

Claims (2)

In a resin pipe joint to be inserted and connected to a hole in a resin pipe, a joint base, a joint core incorporated in the joint base, and a circumferential direction incorporated in the joint base at the outer periphery of the joint core And has a plurality of locking claws that are in a diameter-expanded state due to an elastic action in the diameter-expanding direction and are pushed by the inner surface of the hole of the resin pipe when inserted into the hole of the resin pipe. A diameter-enlarging chuck in which each locking claw is locked to the inner surface of the resin pipe by an elastic action in the diameter-expanding direction when each locking claw is reduced in diameter and inserted into the resin pipe, The outer periphery of the joint core is slidably supported and has a sealing means for sealing the portion in contact with the inner surface of the resin pipe. And a head for reducing the diameter of each locking claw. Plastic pipe fittings, characterized in Rukoto. A joint for a resin pipe to be inserted and connected to a hole of a resin pipe is provided with a joint base, a joint core, a diameter expanding chuck, a coil spring, a head, and a sealing means, and a pipe insertion tube portion is provided projecting from the joint base. A bottomed hole is provided in communication with the pipe insertion cylinder, the joint core has a columnar shape, and concentrically secures a chuck installation space with respect to the inner wall of the bottomed hole of the joint base. The base is fixed to the bottom of the bottomed hole when inserted, and a chuck diameter increasing operation convex part is provided at a portion protruding from the tip of the pipe insertion tube part, and between the chuck diameter increasing operation convex part and the base part This portion is formed as a small-diameter column portion to provide an escape recess for reducing the diameter of the chuck, and has a structure in which a head mounting portion is provided at a location protruding before the chuck diameter-enlarging operation convex portion. Diameter chuck is cylindrical gold A slit is inserted along the longitudinal direction at a predetermined interval in the circumferential direction at a portion ahead of the annular base, and a large number of elastic tongue pieces are provided. Each of which is projecting, and the outer surfaces of these locking claws are tapered outer surfaces whose height increases from the tip toward the rear, and the rear ends of these tapered outer surfaces are locking edges, The inner surface of the front end of each locking claw is a tapered inner surface whose height decreases from the front to the rear, and is incorporated in the chuck mounting space so as to be movable in the axial direction, and is mounted between the bottomed hole. The head is advanced by the elastic force of the coil spring and biased so that the tapered inner surface of each locking claw hits the chuck diameter increasing operation convex portion and the locking claw is expanded. It is slidably fitted to the head mounting part of the core. In addition, a stopper means is used to prevent the head mounting portion from being pulled out, and a taper inner surface is provided on the rear end face to press the locking claw portion in the diameter-reducing direction at an inclination angle in accordance with the inclination of the tapered outer surface of the locking claw portion. The resin pipe joint is characterized in that the sealing means is supported on the outer periphery of the head so as to be slidably in contact with the inner surface of the resin pipe for sealing.

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