JPH1122878A - Pipe fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe fitting which allows pipes to be connected easily, allows tightening forces for the connection to be set easily, and prevents its parts from being dispersed. SOLUTION: This pipe fitting includes a movable cylinder 11 provided freely slidably on the inner periphery of a cylinder member 7; a plurality of elastic claw parts 13 each secured at one end to the outer periphery of the movable cylinder 11 and held at a predetermined interval to the movable cylinder 11 at the other end; a fastening member 21 screwed to the cylinder member 7 and on the inner periphery of which a taper part 22 tapering toward a pipe slot 23 is formed; a spring 18 pressing the elastic claw parts 13 against the taper part 22 by exerting an elastic force on the movable cylinder 11; and a stopper 19 preventing the movable cylinder 11 from loosening from the cylinder member 7. When a pipe (b) is connected, the elastic claw parts 13 leave the taper part 22, and the pipe (b) is inserted between the elastic claw parts 13 and the movable cylinder 11, and, by leaving hands from the pipe (b), the elastic claw parts 13 are made to bite into the pipe to fasten the pipe (b).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint in which a pipe can be easily attached and detached.

[0002]

2. Description of the Related Art In a conventional pipe joint shown in FIG. 5, a pipe connecting portion 2 for connecting a resin pipe P is formed at one end of a cylindrical main body 1. A sleeve 3 made of brass is provided on the outer periphery of the pipe connection portion 2. A pipe P is provided between the sleeve 3 and the pipe connection portion 2.
Is provided for inserting the. A fastening member 4 is provided on the outer periphery of the sleeve 3. One end of the fastening member 4 is screwed to the main body 1. A pipe insertion hole 5 is formed at the other end of the fastening member 4. A tapered portion 6 whose diameter is reduced toward the pipe insertion hole 5 is formed on the inner periphery thereof.

Next, a method of connecting the pipe P will be described. When connecting the pipe P to the pipe joint, first,
The fastening member 4 and the sleeve 3 are removed from the main body 1.
Next, a resin pipe P is inserted into the inner periphery of the removed sleeve 3 and fastening member 4. Then, one end of the pipe P is connected to the outer periphery of the pipe connection portion 2. After connecting the pipes P in this manner, the pipe connecting portion 2
The fastening member 4 and the main body 1 are screwed together with the sleeve 3 positioned on the outer periphery of the body. With such screw connection, the tip of the sleeve 3 is pressed by the tapered portion 6 of the fastening member 4. At this time, the distal end of the sleeve 3 is radially contracted by the tapered portion 6. Then, the pipe P is plastically deformed by the contracted sleeve 3 and is fastened to the pipe connection portion 2.

When removing the pipe P from the above state,
Loosen the screw of the fastening member 4 and remove the fastening member 4 from the main body 1. Then, the sleeve 3 is also removed from the main body 1. After this, the pipe P is removed from the pipe connection part 2.

[0005]

When the pipe P is detached, the fastening member 4 and the sleeve 3
And had to be removed from the main body 1. Therefore, it took time. In particular, the pipe P is connected to the pipe connection 2
When the pipe P was removed from the pipe, the pipe P deformed plastically bites into the pipe connection portion 2 and was not easily removed.
For this reason, the pipe P is forcibly pulled, and in some cases, the pipe P is removed by cutting with a cutter or the like. However, in this case, the pipe P was damaged, and the pipe P could not be reused.
Further, the pipe P fastened to the pipe connection portion 2 undergoes further plastic deformation with the passage of time, and the inner periphery of the pipe P comes into close contact with the pipe connection portion 2. After tightening the pipe P
When plastic deformation occurs, a gap is formed between the pipe P and the sleeve 3. And when such a gap is created,
When the pressure of the fluid in the pipe P acts on the pipe, the diameter of the pipe P increases, and a gap is formed between the pipe P and the sleeve 3. Fluid may leak from this gap. On the other hand, the sleeve 3 is made of brass and has no elastic force, and does not return to its original state once deformed. Therefore, the sleeve 3 could also be used only once.
Further, since the sleeve 3 is detached from the main body 1, the sleeve 3 may be lost when the pipe is attached or detached.

[0006] If the tightening force of the pipe P by the sleeve 3 is too strong, the pipe P will be damaged, and if it is too weak, the pipe P will fall out of the pipe connection portion 2 immediately. Therefore, the sleeve 3 needs an appropriate tightening force. However, the tightening force of the sleeve 3 is determined by the position of the tapered portion 6 pressed against the distal end thereof, and the position of the tapered portion 6 is determined by the tightening condition of the screw between the tightening member 4 and the main body 1. That is, the pipe P
Is changed depending on the degree of tightening of the tightening member 4. Since the tightening of the tightening member 4 is performed manually, there is an individual difference in the tightening force, and it is difficult to keep the tightening force constant. SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe joint in which a pipe can be easily attached and detached, parts do not fall apart at the time of attachment and detachment, and a constant tightening force of the pipe can be provided.

[0007]

According to a first aspect of the present invention, there is provided a cylinder member, a movable cylinder provided on an inner periphery of the cylinder member and slidably provided, and one end fixed to an outer periphery of the movable cylinder. And a plurality of elastic claws at a predetermined distance between the movable cylinder and the other end thereof, and a cylindrical fastening screw-coupled to the cylindrical member and having a pipe insertion hole formed on the opposite side of the screw coupling part. A member, a taper portion formed on the inner periphery of the tightening member and reduced in diameter toward the pipe insertion hole, and a spring for applying an elastic force in the axial direction to the movable cylinder to press the elastic claw portion against the taper portion. And a stopper for preventing the movable cylinder from falling out of the cylindrical member.

When the resin pipe inserted from the pipe insertion hole is pressed against the elastic claw portion pressed in the radial direction by being pressed against the tapered portion, and the movable cylinder is moved together with the elastic claw portion, the elastic claw portion is tapered. The resin pipe extends radially away from the portion, and a resin pipe is inserted between the elastic claw portion and the movable cylinder. On the other hand, when the pressing of the resin pipe is stopped, the elastic claw part is pressed against the tapered part and shrunk in the radial direction with the movement of the movable cylinder, and the elastic claw part bites into the resin pipe, thereby tightening the resin pipe. It is characterized by the following. A second invention is characterized in that a spring is provided between the movable cylinder and the elastic claw portion in the first invention, and a radial elastic force of the spring acts on the elastic claw portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first embodiment shown in FIGS. 1 and 2, a small-diameter portion 8 and a large-diameter portion 9 are formed on the inner periphery of a cylindrical member 7, and the boundary between them is a step portion 10. A movable cylinder 11 is provided on the inner periphery of the cylindrical member 7, and the movable cylinder 11 is slidable with respect to the small diameter portion 8. At one end of the movable cylinder 11, a pipe connecting portion 17 for connecting the pipe P is formed. Further, a convex portion 12 is formed on the outer periphery of the movable cylinder 11.

[0010] One end of a sleeve 13 that holds a predetermined interval around the outer periphery of the movable cylinder 11 is fixed to the convex portion 12. The sleeve 13 has a plurality of slits 14 formed in the axial direction as shown in FIG. By forming these slits 14, the diameter of the distal end 15 of the sleeve 13 changes elastically.
A claw portion 16 bent toward the center is formed on the inner periphery of the distal end 15 of the sleeve 13.
In the first embodiment, the sleeve 13 having the slit 14 and the claw portion 16 forms the elastic claw portion of the present invention. However, the plate-shaped elastic body having the claw portion is directly moved by the movable cylinder. 11 may be fixed.

A fastening member 21 for covering the outer periphery of the sleeve 13 is screwed to the cylindrical member 7. The fastening member 21 has a pipe insertion hole 23 at one end. In addition, a tapered portion 22 whose diameter decreases toward the pipe insertion hole 23 is formed on the inner periphery of the fastening member 21.

On the other hand, a spring 18 is provided on the outer periphery of the movable cylinder 11. The spring 18 has one end in contact with the step 10 and the other end in contact with the projection 12. Then, the elastic force of the spring 18 is
Acting on the movable cylinder 11. When the movable cylinder 11 moves rightward in the figure by the elastic force of the spring 18, the movable cylinder 1
The tip 15 of the sleeve 13 provided on the tapered portion 2
Pressed on 2. Therefore, the diameter of the distal end portion 15 of the sleeve 13 is reduced. Note that the elastic force of the spring 18 is larger than the elastic force of the sleeve 13.

A movable cylinder 1 is provided on the inner periphery of the large-diameter portion 9.
1 incorporates a ring-shaped stopper member 19 for preventing the cylinder member 7 from falling off. Although the stopper member 19 has a ring shape in this embodiment, the stopper member 19 is not limited to the ring shape, and may be provided, for example, as a protrusion on the inner periphery of the large diameter portion 9. Reference numeral 24 denotes an O-ring,
The O-ring 24 seals the space between the movable cylinder 11 and the small diameter portion 9. Reference numeral 20 denotes a stopper step, and the movable step 11
The movement in the axial direction.

Next, a case where a resin pipe is connected to the joint of the first embodiment will be described. The above cylindrical member 7
When the fastening member 21 is screwed to the fastening member 21, the sleeve 13
The diameter of the tip portion 15 of the pipe is reduced, and the claw portion 16 and the pipe connection portion 1 are reduced.
7 becomes narrower. In this state, the resin pipe P
Is pushed in from the pipe insertion hole 23, the claw portion 16 and the pipe connection portion 17 are pushed by the pipe P. Therefore, the movable cylinder 11 moves leftward in the figure while resisting the elastic force of the spring 18, and the tip 15 of the sleeve 13 moves away from the tapered portion 22. When the distal end 15 of the sleeve 13 moves away from the tapered portion 22, the distal end 15 of the sleeve expands in the radial direction due to its elastic force, and the claw portion 16 and the pipe connection portion 17 are expanded.
Spread between. The pipe P enters this gap,
It is connected to the outer periphery of the pipe connection part 17.

After the pipe P is connected to the pipe connection portion 17 and the user releases his hand from the pipe P, the movable cylinder 11 moves rightward in the figure by the elastic force of the spring 18. Therefore, the tip 15 of the sleeve 13 is pressed against the tapered portion 22 again, and the diameter of the tip 15 of the sleeve 13 is reduced. When the distal end portion 15 of the sleeve 13 is thus reduced in diameter, the pipe P is fastened to the pipe connection portion 17 by the claw portion 16. Then, the space between the pipe P and the pipe connection portion 17 is sealed. Further, since the claw portion 16 bites into the resin pipe P when the distal end portion 15 of the sleeve 13 is reduced in diameter, the pipe P does not come off. A circumferential groove is formed on the outer periphery of the pipe connecting portion 17, and an O groove is formed in the groove.
A ring may be incorporated. In this way, the tightness between the pipe P and the pipe connection is improved.

On the other hand, when removing the pipe P from the pipe connecting portion 17, the fastening member 21 is loosened and the sleeve 13 is removed.
Is separated from the tapered portion 22. By doing so, the distal end portion 15 of the sleeve 13 expands in the radial direction by its elastic force, and the claw portion 16 separates from the pipe P. Therefore, the pipe P can be easily removed from the pipe connection portion 17. That is, the pipe P can be easily removed from the pipe connection portion 17 only by loosening the fastening member 21. When removing the pipe P, the fastening member 21 may be completely removed from the tubular member 7. In this case, the stopper 13 prevents the sleeve 13 from coming off the cylindrical member 7.
3 is not lost.

The second embodiment shown in FIGS. 3 and 4 is different from the first embodiment in the shape of the sleeve, the means for fixing the sleeve to the movable cylinder, and the point that a spring is provided on the inner periphery of the sleeve. The other parts are the same as the first embodiment. Therefore, a detailed description of the same configuration as in the first embodiment will be omitted.

A sleeve 25 is provided on the outer periphery of the movable cylinder 11. The sleeve 25 has a plurality of slits 29 formed in the axial direction as shown in FIG.
Has elasticity in the radial direction. And this tip part 30
A claw portion 31 is formed on the inner circumference of the. One end of the sleeve 25 is sandwiched between the large-diameter portion 9 of the cylindrical member 7 and the convex portion 26 formed on the outer periphery of the movable cylinder 11 and the stopper member 2
7 regulates the relative movement of the movable cylinder 11 in the axial direction.

A spring 28 is provided on the inner periphery of the sleeve 25 and a radial elastic force acts on the sleeve 25. By doing so, the radial elastic force of the sleeve 25 is increased, and if the distal end of the sleeve 25 is separated from the tapered portion 22, the diameter of the distal end portion 30 of the sleeve 25 is surely expanded. Therefore, the pipe P can be reliably attached and detached. However, the elastic force of the spring 28 also weakens the elastic force of the spring 18. In the second embodiment, as in the first embodiment, the slit 2
The elastic claw portion of the present invention is constituted by the sleeve 25 having the claw portion 9 and the claw portion 31. However, a plate-like elastic body having the claw portion may be directly fixed to the movable cylinder 11.

[0020]

According to the first aspect, the pipe can be connected without removing the tightening member from the tubular member.
Further, since the elastic claw portion for tightening the pipe has a radial elastic force, the state returns to the original state if there is no external force for reducing the diameter. Therefore, the pipe can be tightened many times with the elastic claws. And since the elastic claw part just clamps the pipe by the elastic force of the spring, the pipe is not plastically deformed as in the related art. Moreover, the pipe is easy to remove and does not hurt when removed. Therefore, even if this pipe is once removed, it can be reused as it is.

Further, since the elastic force of the spring always acts on the elastic claw portion for tightening the pipe, if the wall thickness of the pipe changes, the diameter of the elastic claw portion changes according to the thickness. Therefore, the pipe is always kept in a tightened state, and there is no gap between the pipe and the elastic claw portion. Therefore, the pipe does not come off or the fluid in the pipe does not leak. Since the elastic force of the spring applied to the movable cylinder is constant, the force with which the elastic claw portion tightens the pipe is also constant. Therefore, the tightening force of the pipe, which has conventionally varied from person to person, can be made constant. Further, the elastic claw portion is fixed to the movable cylinder, and the movable cylinder is prevented from coming off from the cylinder member by the stopper. That is, the elastic claw portion does not separate from the cylindrical member. Therefore, even when the fastening member is removed when removing the pipe, the elastic claws are not lost.

According to the second aspect, since the elastic force in the radial direction of the spring is applied to the elastic claw portion, even a material having a low elastic force can be used for the elastic claw portion. In addition, since the strong elastic force of the spring acts on the elastic claw portion, the diameter of the elastic claw portion surely increases when the elastic claw portion is separated from the tapered portion. Therefore, the attachment and detachment of the pipe can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment.

FIGS. 2A and 2B are views showing a sleeve of the first embodiment, and FIG.
It is sectional drawing of the AA line of (b), (b) is a front view of a sleeve.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a view showing a sleeve according to a second embodiment, and FIG.
It is sectional drawing of the AA line of (b), (b) is a front view of a sleeve.

FIG. 5 is a sectional view of a conventional pipe joint.

[Explanation of symbols]

 7 Cylinder member 11 Movable cylinder 13 Sleeve constituting elastic claw portion of the present invention 14 Slit constituting elastic claw portion of the present invention 16 Claw portion constituting elastic claw portion of the present invention 18 Spring 19 Constructing stopper of the present invention Stopper member 21 Tightening member 22 Taper portion 23 Pipe insertion hole 25 Sleeve forming elastic claw portion of the present invention 28 Spring 29 Slit forming elastic claw portion of the present invention 31 Claw portion forming elastic claw portion of the present invention

Claims (2)

[Claims] A movable member provided on the inner periphery of the tubular member and slidably fixed to one end on the outer periphery of the movable member and connected to the movable end on the other end. A plurality of elastic claws, each having a predetermined interval, a cylindrical fastening member screw-connected to the cylindrical member and having a pipe insertion hole formed on the side opposite to the screw-connected portion, and an inner periphery of the tightening member. A taper portion formed and reduced in diameter toward the pipe insertion hole, a spring for applying an elastic force in the axial direction to the movable cylinder to press the elastic claw portion against the tapered portion, and the movable cylinder does not fall out of the cylindrical member. When the movable pipe is moved together with the elastic claw by pressing the resin pipe inserted from the pipe insertion hole against the elastic claw which is pressed against the tapered portion and radially contracted, the elastic claw is provided. Is the part tapered? When the resin pipe is inserted between the elastic claw and the movable cylinder while the resin pipe is stopped, the elastic claw is pressed against the tapered part as the movable cylinder moves. The pipe joint has a configuration in which the elastic claws are cut into the resin pipe and tightened. 2. The pipe joint according to claim 1, wherein a spring is provided between the movable cylinder and the elastic claw portion, and a radial elastic force of the spring acts on the elastic claw portion.