JPH017914Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a pipe joint, and more particularly to a pipe joint that can enhance the durability of a locking ring, which is a locking body.

(Prior art) The present invention was published in Japanese Patent Application No. 59-88174
This invention relates to further improvements to the pipe joint (see Publication No. 231093).

As shown in FIG. 4, the pipe fitting 10 has a locking ring 12 in the joint body 14, which is a zigzag ring whose outer peripheral surface is bent over a certain width so that the cross section is dogleg-shaped. (Part 3)
figure).

16 is a guide ring that holds the locking ring 12, and a groove 1 is formed by caulking the thin part at the tip.
8 to hold the outer peripheral side of the locking ring 12.

The inner diameter of the locking ring 12 is set to be slightly smaller than the outer diameter of the tube body 20 to which it is to be connected.

22 is a release ring, and 24 is a seal ring.

Therefore, if the tube body 20 is inserted into the joint body 14 until its tip presses the locking ring to expand its diameter and the tip contacts the stepped portion 26, the tube body 20 will be inserted in this inserted state.
0 is temporarily prevented from coming off. That is, the inner diameter edge of the locking ring 12 sinks into the outer wall of the tube body 20 due to its own elastic force.

However, if this continues, it is unclear whether the locking ring 12 is reliably embedded in the outer wall of the tube body 20. In other words, if the tube body 20 is made of a relatively hard material, if a force is applied to the tube body 20 in the direction of pulling out for some reason, the inner diameter edge of the locking ring 12 may touch the outer wall of the tube body 20. There is a risk that the pipe body 20 may slip without being caught, and the pipe body 20 may fall out.

Therefore, in the pipe fitting 10 described above, the pipe body 20
Pull it slightly in the direction of removal from the above insertion position. Then, if the locking ring 12 is bitten into the outer wall of the tube body 20 in the initial insertion state, the tube body 2
By pulling the lock ring 12 in the withdrawal direction, the inner end of the locking ring 12 rotates about the outer end as a fulcrum, as shown in the figure.

In the pipe joint 10 described above, the tip of the release ring 22 is attached to the locking ring 1 at a position R slightly beyond the maximum biting position Q of the inner edge into the outer wall of the pipe body 20.
The length of the release ring 22 is set so that it abuts on and supports the release ring 22. Therefore, in this state, the locking ring 12 is stably locked, and its inner edge is reliably embedded in the outer wall of the tube body 20.
It prevents 0 from falling out. If the locking ring 12 slips when the tubular body 20 is slightly pulled out from the inserted state, the tubular body 20 may be pushed in again and pulled in the removal direction while checking that it is wedged in.

To remove the tubular body 20, push the tubular body 20 back beyond the maximum biting position Q of the inner edge of the locking ring to the initial insertion state, and then push the release ring 22
The tube body 20 can be easily pulled out by pushing in the retaining ring 12 and expanding the diameter of the retaining ring 12 at its tip to release the inner edge from being bitten into the outer wall of the tube body 20.

(Problems to be Solved by the Invention) However, even with the above pipe joint 10, there are the following problems.

That is, in the case of the above-mentioned pipe joint 10, the locking ring 12 moves from the solid line position to the dotted line position in the recess 1.
Moves within 8. Therefore, when forming the recess 18 by caulking the tip of the guide ring 16, the recess 18 must be provided with a width that allows the locking ring 12 to move within it.

By the way, in most cases, the tube body 20 (flexible tube) to be connected is used as it is or after being wound into a ring on a reel or the like and cutting it into the required length each time.

Then, such a tube body 20 retains the curl when it was wound into a ring shape, and is deformed into an arc shape.

When the tubular body 20 curved in an arc shape is inserted into the joint body 14, the positions where the locking ring 12 bites into the outer wall of the tubular body 20 are not located on the same circumference, and the tubular body 20 is pulled to the above-mentioned locking position. Also, as shown in FIG. 5, the fulcrum on one side of the locking ring shifts, and the positions at which the inner edge of the locking ring 12 bites into the outer wall of the tube body 20 are not on the same circumference. Locked.

By the way, the above-mentioned pipe joints are often used in pneumatic circuits of robotic devices and the like. In such pneumatic circuits, pressurization and depressurization are frequently repeated alternately, and the pipe body 2
0 expands and contracts each time.

When the tube body 20 expands and contracts in this way, the locking ring 1
2 is deformed in the radial direction accordingly, but if the locking position of the locking ring 12 is not on the same circumference of the outer wall of the tube body 20 as described above, the degree of deformation of the locking ring 12 is not uniform throughout; There is a problem in that stress concentrates on a portion of the locking ring 12, causing the locking ring 12 to be cut and destroyed at that portion.

In other words, such repeated stress concentrations tend to break the locking ring 12 at a portion thereof, and the locking ring 12 breaks unexpectedly easily.

The present invention was made to solve the above problems, and its purpose is to increase the durability of the locking ring by locking the locking ring on the same circumference of the outer wall of the tube. We provide pipe fittings.

(Summary of the invention) The present invention has the following configuration in order to solve the above problems.

In other words, there is a locking body that is held in the joint body and whose inner edge bites into the outer wall of the tube body inserted into the joint body to prevent the tube from coming off, and a locking body that is held in the moving position by the tip. In the pipe joint, the locking body includes a release ring supported by the joint body so as to be movable within a predetermined range in the axial direction of the joint body in order to press the inner edge to release the biting of the inner edge into the outer wall of the pipe body. A zigzag ring shape is formed in which a large number of radial cuts are alternately formed from each of the inner and outer edges, and the outer peripheral edge side where the cuts are formed extends over a certain width in the insertion direction of the tube body. The opening ring holds the inserted pipe in such a way that the inner edge of the locking body When the inner edge of the locking body is rotated in an almost arc shape by slightly pulling it in the removal direction while it remains embedded in the outer wall, the locking body will be moved at a position slightly beyond the maximum penetration position into the outer wall of the tube. The length to the tip of the release ring is set so that it comes into contact with the tip of the release ring and is locked, and the concave groove in which the locking body is held has a protrusion on the wall facing the locking body. The stop body is formed so that its cross section forms a chevron-shaped protrusion so as to face the base of the bent portion, and the portion that sandwiches the base of the bent portion is regulated by the chevron-shaped protrusion so that the locking body is formed in the bent portion. It is characterized by being narrow in width within a range that does not impede the rotation when it rotates as described above with the vicinity of the base as a fulcrum.

(Embodiments) Below, preferred embodiments embodying the present invention will be described in detail along with their effects.

FIG. 1 is a sectional view showing an example of a pipe joint according to the present invention. Components that are the same as those of the pipe joint shown in FIG. 3 are designated by the same reference numerals, and their explanations will be omitted.

For some additional explanation, release ring 22
The protruding peripheral portion 30 provided on the outer periphery of the guide ring 1
It is prevented from coming off by coming into contact with the protruding part 32 provided at the guide ring 6, and can be pushed from this stopping position to the position shown by the broken line in the figure, that is, the position where the end face of the flange part comes into contact with the end face of the guide ring 16, At this pushed-in position, the locking ring 12 is pressed to release its engagement with the outer wall of the tube body 20.

Also, in the present invention, the behavior of the locking ring 12 is the same as described above, and by pulling the tube body 20 in the withdrawal direction, it rotates from the biting position P to the R position slightly exceeding the maximum biting position Q. It is set so as to come into contact with the tip of the release ring 22 at the above-mentioned retaining position.

The present invention is characterized in that a rotation restriction ring 34 is provided.

The rotation regulating ring 34 is fixed to the guide ring 16 by having a circumferential groove 36 provided in its circumferential wall, and fitting the protrusion 38 bent inwardly into the circumferential groove 36 to position the tip of the guide ring 16. has been done.

The end surface of the rotation restriction ring 34 on the side of the locking ring 12 is provided so that its protruding tip faces approximately the throat base of the bent portion of the locking ring 12 (the base of the bent portion), so that the cross section forms a protrusion shape of a chevron. There is.

A concave groove 4 is formed by the outer slope 42 of the chevron-shaped protrusion 40 and the stepped wall 44 of the guide ring 16.
The locking ring 12 is mounted within the joint body 14 by holding the bent portion of the locking ring 12 within the joint body 14 (FIG. 2).

Further, the angle of inclination of the outer inclined surface 42 of the chevron-shaped protrusion 40 is set at such an angle that the bent portion substantially comes into contact with the locking ring 12 when it is in the aforementioned locking position R.

Furthermore, the angle of inclination of the inner slope 48 of the chevron-shaped protrusion 40 is approximately equal to the angle of inclination of the locking ring 12 when the locking ring 12 is pressed by the release ring 22 and released from the outer wall of the tube body 20. It is set in.

The inner diameter of the rotation restriction ring 34 is the same as that of the pipe body 2 to be connected.
The diameter is approximately equal to the zero outer diameter.

The present invention is configured as described above.

When the tube body 20 is inserted into the joint body 14 in order to connect the tube body 20, the locking ring 12 is pressed against the tip of the tube body 20 and rotates in the same manner as described above. 20 It bites into the outer wall due to its own elastic force. At this time, the locking ring 12 does not use its outer edge as a fulcrum, but is restricted by the chevron-shaped protrusion 40 of the rotation restriction ring 34, so that it rotates using the tip of the chevron-shaped protrusion 40 as a fulcrum, and the outer end Edge is concave groove 4
6 You will be sliding on the bottom surface.

Since the locking ring 12 rotates about the chevron-shaped protrusion 40 as a fulcrum in this way, even if the tube body 20 is slightly curved, the locking ring 12 is positioned almost on the same circumference of the tube body 20 and bites into it.

Note that the tube body 20 has an insertion hole 50 in the joint body 14.
The tip part fits into the rotation regulating ring 3.
Since the middle part is regulated by the inner hole 4,
Even if it is slightly curved before insertion, it will be straightened into a nearly straight shape, and the area around the locking ring 12 in particular will be almost straight as it is restricted by the rotation restriction ring 34. Due to the combination of straightening of the body 20 and the effect of rotating about the chevron-shaped protrusion 40 as a fulcrum, the body 20 bites into the outer wall of the tube body 20 almost on the same circumference.

Similarly, when the tubular body 20 is pulled in the removal direction, the bent portion of the locking ring 12 comes into contact with the step wall 44, rotates around the tip of this bent portion as a fulcrum, and is locked at the R position described above. Therefore, the above-mentioned biting position does not shift and is locked while being bitten on the same circumference of the outer wall of the tube body 20.

Therefore, even if the tubular body 20 expands or contracts, the stress at that time acts uniformly on the entire locking ring 12, preventing breakage of the locking ring 12 and increasing its durability.

(Effect of the invention) As described above, according to the pipe joint according to the invention, since the locking ring is embedded on the same circumference of the outer wall of the pipe body,
Partial stress concentration on the locking ring is avoided when the tubular body expands and contracts, preventing breakage of the locking ring and increasing durability.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a preferred example of a pipe joint according to the present invention, and FIG. 2 is a partially enlarged view thereof. Third
The figure is a sectional view of a conventional pipe joint, FIG. 4 is an explanatory view of the locking body thereof, and FIG. 5 is an explanatory view showing the hooked state of the locking body when the pipe body is curved. 10... Pipe joint, 12... Locking ring, 14...
...Joint body, 16...Guide ring, 18...Concave groove, 20...Pipe body, 22...Release ring, 24...
...Seal ring, 26...Step part.

Claims (1)

[Claims for Utility Model Registration] A locking body that is held within a joint body and whose inner edge bites into the outer wall of a tube inserted into the joint body to prevent the tube from coming off; A pipe joint equipped with a release ring supported by a joint body so as to be movable within a predetermined range in the axial direction of the joint body in order to release the inner edge from being wedged into the outer wall of the pipe body by being pressed by the tip at the moving position. , The locking body is formed in a zigzag ring shape in which a large number of radial cuts are alternately formed from each of the inner and outer edges, and the outer peripheral edge side where the cuts are formed has a constant width. The opening ring is bent in the insertion direction of the pipe body, and is held within the joint body by fitting this bent part into a groove provided in the joint body, and the release ring locks the inserted pipe. When the inner edge of the locking body was rotated in an almost arc shape by slightly pulling in the removal direction while the inner edge of the body was embedded in the outer wall, the position slightly exceeded the maximum penetration into the outer wall of the tube. The length to the tip of the locking body is set so that the locking body comes into contact with the tip of the release ring and is locked at this position, and the groove in which the locking body is held is formed on the side opposite to the locking body. The protrusion on the wall surface is formed to have a chevron-shaped cross section so as to face the base of the bent portion of the locking body, and the portion that sandwiches the base of the bent portion is regulated by the chevron-shaped protrusion and A pipe joint characterized in that the locking body is formed to have a narrow width within a range that does not impede the rotation when the locking body rotates as described above with the vicinity of the base of the bent portion as a fulcrum.