JP2615282B2 - Connection pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a countermeasure for preventing connection failure at a joint of a connecting pipe.

[0002]

2. Description of the Related Art Conventionally, as a joint of a connecting pipe, a connecting pipe [c] is inserted into a pipe inserting portion [b] of a body [a] as shown in FIG. There has been widely known a method in which a pipe is fastened to a tube insertion portion [b] through a chuck ring [e] by [d]. Here, since the connection pipe [C] is a soft pipe made of polyethylene, a chuck ring [E] having protruding teeth on the inner peripheral surface is used,
When the connection pipe is a hard pipe made of stainless steel or the like, a retainer ring having no protruding teeth on the inner peripheral surface is used. Hereinafter, the chuck ring and the retainer ring are collectively referred to as a fastening ring.

[0003]

In the above-mentioned conventional apparatus, since the insertion of the connecting pipe [c] into the pipe insertion portion [b] is performed manually by relying on intuition, the connecting pipe [c] is used. Is not quite constant (L in FIG. 11). For this reason,
In some cases, the cap nut [d] may be tightened when the connection pipe [c] is not sufficiently inserted into the pipe insertion portion [b], that is, when the insertion length L is shorter than a predetermined amount. Due to the defect, water leaks from between the pipe insertion part [b] and the connection pipe [c] or the connection pipe [c] falls off from the pipe insertion part [b].

The present invention has been made in view of such a point, and an object of the present invention is to make it possible to confirm the position of the distal end of a connecting pipe with a simple structure and to shorten the insertion length. Therefore, the purpose of the present invention is to securely control the insertion length to a predetermined amount by preventing the cap nut from being tightened.

[0005]

Means for Solving the Problems To achieve the above object, a solution taken in claim 1 is that a connecting pipe inserted into a pipe insertion part of a body part is tightened by a cap nut via a pipe insertion part. Assume that the joint of the connecting pipe is to be tightened. Then, a stopper is provided in the pipe insertion portion so as to be urged to abut on the distal end face of the connection pipe and rise up in the connection pipe radial direction. Further, a guide groove is provided in the male screw portion of the body to allow the stopper to move in the connecting pipe insertion direction. Further, the cap nut is provided with an engagement portion that engages with the stopper when the insertion length of the connection pipe is equal to or less than a predetermined amount.

According to a second aspect of the present invention, the stopper is provided by raising a coil spring portion wound around a tube insertion portion and one end of a wire of the coil spring portion in the radial direction of the connection tube. It is constituted by a locking portion.

Further, a solution of the present invention is that the stopper comprises a coil spring portion wound around a tube insertion portion;
A ring portion fixed to one end of the coil spring portion and abutting against the end face of the connecting pipe, and a locking portion rising from the ring portion in the radial direction of the connecting pipe.

[0008] The solution means of claim 4 is configured such that the cap nut is provided with a retaining member for preventing the connection pipe from coming off.

[0009]

According to the first aspect of the present invention, when the connection pipe is inserted into the pipe insertion portion of the body, the distal end surface of the connection pipe comes into contact with the stopper,
Further, the stopper is pushed by the connecting pipe to move the guide groove of the body in the connecting pipe inserting direction. Therefore, the position of the distal end of the connection pipe can be confirmed by the position of the stopper, and the insertion length can be controlled to a predetermined amount.

[0010] In this case, when the insertion length of the connection pipe is less than a predetermined amount, the engaging portion of the cap nut engages with the stopper to prevent the cap nut from rotating. For this reason, it is impossible to tighten the connection pipe to the pipe insertion portion by the cap nut, thereby preventing the occurrence of a poor connection state.

According to the second aspect of the present invention, the coil spring portion exerts an urging force to bring one end of the coil spring portion into contact with the distal end surface of the connection pipe. An engaging portion provided integrally with the coil spring portion indicates the position of the distal end of the connecting tube, and when the insertion length of the connecting tube is less than a predetermined amount, a cap nut is engaged with the engaging portion. The parts engage.

According to the third aspect of the present invention, the coil spring exerts a biasing force to bring the ring into contact with the distal end surface of the connection pipe. In this case, since the ring portion abuts on the distal end surface of the connecting pipe from the beginning, the coil spring portion is contracted straight in the coil axial direction without being twisted or bent, and there is no trouble such as being caught by the pipe insertion portion.
The function of the locking portion is the same as that of the first aspect.

According to the fourth aspect of the present invention, the retaining member functions even if a force is applied to the connecting pipe in the pull-out direction due to the urging force of the stopper or the deformation of the connecting pipe. The connection tube does not come off.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below in detail with reference to the drawings. 1 to 5 show a joint of a connecting pipe according to a first embodiment. In this embodiment, a soft tube is used as the connection tube.
In these drawings, reference numeral 1 denotes a torso.
Is provided with a fluid passage. A wrench engaging portion 1a is provided at a central portion of the body portion 1, a tube insertion portion 1b is provided at one end thereof, and a male portion is provided on an outer peripheral side of the tube inserting portion 1b so as to surround a base end portion. A screw portion 1c is provided. Reference numeral 4 denotes a cap nut provided at one end of the body 1, and a female screw 4 a is provided on the inner peripheral surface of the cap nut 4, and the female screw 4 a is a male screw of the body 1. It is screwed into the part 1c. The inner part of the cap nut 4 has a tapered surface 4b.
It has become. Further, reference numeral 2 denotes a connection pipe made of polyethylene, the tip of which penetrates the cap nut 4 and fits outside the pipe insertion portion 1b of the body 1. A chuck ring 3 having a protruding tooth 3a on an inner peripheral surface is provided as a fastening ring between the connection pipe 2 and the tapered surface 4b of the cap nut 4.
The protruding teeth 3a bite into the outer wall of the connection pipe 2.

That is, when connecting the connecting pipe 2 to the body 1, the connecting pipe 2 is passed through the cap nut 4 while the cap nut 4 is temporarily fixed to the body 1 as shown in FIG. 1b
Then, the cap nut 4 is tightened. As a result, as shown in FIG. 2, the chuck ring 3 is pressed down by the tapered surface 4b of the cap nut 4, and the chuck ring 3 is reduced in the center direction. Connect to 1.

A stopper 5 is provided on the tube insertion portion 1b.
Is provided. The stopper 5 includes a coil spring portion 5a wound around the tube insertion portion 1b, and a locking portion 5b formed by raising one end of a wire of the coil spring portion 5a in the radial direction of the connection tube 2. Spring part 5
The one end thereof is configured to abut the distal end surface 2a of the connection pipe 2 by the urging force of a.

Further, a guide groove 6 is formed in the male thread portion 1c of the body portion 1 by being partially cut in the connecting pipe insertion direction, so that the stopper locking portion 5b moves in the connecting pipe insertion direction. It is configured to allow.

Further, a groove-shaped engaging portion 7 is formed by cutting off a part of the cap nut 4 on the body side, so that the insertion length L of the connecting pipe 2 is less than a predetermined amount. Stopper locking portion 5b in which this engaging portion 7 abuts on distal end surface 2a at some time
Is adapted to be engaged. The engaging portion 7 may be provided at two or more locations on the circumference of the cap nut 4. The height of the locking portion 5b of the stopper 5 is such that when the locking portion 5b enters the engaging portion 7 of the cap nut 4, the tip is slightly longer than the engaging portion 7 (for example, 0.5 to 1 mm). ) Is set to only exit.

The cap nut 4 is provided with a retaining member 8. That is, as shown in FIG. 5, a ring groove 4c is engraved on the inner peripheral wall at the tip of the tapered surface of the cap nut 4, and a ring-shaped rubber retaining member 8 is fitted into the ring groove 4c. The connecting tube 2 is prevented from coming off due to frictional force.

Next, the operation and effect of the above embodiment will be described. First, before the connecting pipe 2 is inserted, the coil spring portion 5a of the stopper 5 is extended and the stopper locking portion 5b is engaged with the engaging portion 7 of the cap nut 4 as shown in FIG. Then, as shown in FIG. 2, when the connecting pipe 2 is inserted into the pipe inserting portion 1b of the body 1, the distal end surface 2a comes into contact with the stopper locking portion 5b, and the stopper locking portion 5b is further connected to the connecting pipe. 2, the guide groove 6 of the body 1 is moved in the connecting pipe insertion direction while opposing the urging force of the stopper coil spring portion 5a. Therefore, the position of the distal end of the connection pipe 2 can be visually recognized by the position of the stopper locking portion 5b.
The insertion length L can be controlled to a predetermined amount. In this case, the tip of the stopper locking portion 5b is
From the connection pipe 2 by touching the tip with the hand.
It is possible to easily manage the insertion length L even in a dark place or a narrow place where visual recognition is difficult.

In this case, as shown in FIG. 3, when the insertion length L of the connecting pipe 2 is less than a predetermined amount, the stopper locking portion 5
Since b is still engaged with the engaging portion 7 of the cap nut 4, rotation of the cap nut 4 is prevented. For this reason, the connection pipe 2 cannot be fastened to the pipe insertion portion 1b by the cap nut 4, and the occurrence of a poor connection state is prevented.

Therefore, in any work place including a dark place or a narrow place where it is difficult to visually recognize, a connection failure at the joint of the connection pipe is effectively prevented to prevent water leakage from between the pipe insertion portion 1b and the connection pipe 2 and a connection pipe. It is possible to effectively prevent problems such as dropping out of the second tube insertion portion 1b.

Further, since the stopper 5 can be manufactured by raising one end of the wire of the coil spring portion 5a in the radial direction of the connecting pipe, the number of parts of the stopper 5 can be reduced to one and the cost can be reduced. .

Further, a stopper coil spring portion 5a
Even if a force in the pull-out direction (left direction in FIG. 2) acts on the connecting pipe 2 due to the urging force of the connecting pipe 2 or deformation of the connecting pipe 2, the slip-off preventing member 8 prevents the connecting pipe 2 from slipping out. Before the nut 4 is completely tightened, the distal end side of the connection pipe 2 does not retreat or come off. Therefore, in the connection work, once the connection pipe 2 is inserted into the pipe insertion portion 1b, work such as holding the connection pipe 2 becomes unnecessary, and only the cap nut 4 is simply tightened. One-handed work is also possible, improving workability.

Next, a second embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in the configuration of the body and the stopper. That is, the stopper 5 '
A one-turn part 5'c fitted into the inner peripheral surface 1'd of the male screw part 1'c in the body part 1 ', and a locking part 5 rising from the one-turn part 5'c in the radial direction of the connecting pipe 2. 'b.
The inner peripheral surface 1'd of the male screw portion 1'c is formed in a tapered surface so that the diameter decreases toward the inner part.
Therefore, when the connection pipe 2 is inserted into the pipe insertion part 1'b of the body part 1 ', the pipe end face 2a comes into contact with the stopper one-turn part 5'c, and the one-turn part 5'c becomes the male screw part 1'. Heading toward the inside of c. At this time, the diameter of the one-turn part 5'c is reduced according to the change in the shape of the inner peripheral surface 1'd.
Is stored in the stopper 5 '.
Are kept in contact with the pipe end face 2a of the connection pipe 2. As in the first embodiment, the height of the stopper locking portion 5'b is such that the locking portion 5'b is
It is set so that the tip comes out of the engagement portion 7 by a slight length when entering.

Therefore, according to this embodiment, the position of the distal end of the connection pipe 2 can be confirmed by the position of the stopper locking portion 5'b, and the insertion length L can be controlled to a predetermined amount. When L is equal to or less than a predetermined amount, the fastening of the connection pipe 2 to the pipe insertion portion 1'b by the cap nut 4 becomes impossible by the engagement of the cap nut engaging portion 7 with the stopper locking portion 5'b. Therefore, poor connection at the joint of the connection pipe is effectively prevented, and problems such as water leakage from the pipe insertion part 1'b and the connection pipe 2 and dropping of the connection pipe 2 from the pipe insertion part 1'b occur. Can be effectively prevented. In the case where the retaining member 8 is used, the connection pipe 2 does not come off before the fastening of the cap nut 4 is completed due to the action.

Further, the stopper 5 'has a one-turn part 5'c
Can be manufactured by raising one end in the radial direction of the connection pipe, so that the number of parts of the stopper 5 'is one and the cost can be reduced.

Next, a third embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in the configuration of the body, the stopper and the cap nut. That is, the stopper 5 ″ is a coil spring portion 5 ″ e wound around the tube insertion portion 1b, and a ring portion 5 ″ which is fixed to one end of the coil spring portion 5 ″ e by brazing and abuts on the connection pipe end face 2a. f, and two locking portions 5 "g rising from the ring portion 5" f in the radial direction of the connecting pipe, and the two locking portions 5 "g are connected via the center of the ring portion 5" f. They are provided at opposing positions. The guide groove 6 of the body 1
Are also provided at positions facing each other via the central axis, and two engaging portions 7 of the cap nut 4 are also provided at positions facing each other via the central axis. In addition, as in the first embodiment, the height of the stopper locking portion 5 "g is equal to the locking portion 5" g.
Is inserted into the engaging portion 7 of the cap nut 4,
Is set to slightly extend from

Therefore, also in this embodiment, the position of the distal end of the connecting tube 2 can be confirmed by the position of the stopper locking portion 5 "g, and the insertion length L can be managed to a predetermined amount. When L is equal to or less than a predetermined amount, the fastening of the connection nut 2 to the pipe insertion portion 1b by the cap nut 4 becomes impossible by the engagement of the cap nut engaging portion 7 with the stopper locking portion 5 "g. Effectively preventing poor connection at the joint of the connecting pipe and effectively preventing problems such as water leakage from the pipe inserting section 1b and the connecting pipe 2 and dropping of the connecting pipe 2 from the pipe inserting section 1b. Can be. In this case, since there are two stopper locking portions 5 "g, two guide grooves 6, and two engaging portions 7, the tip position of the connection pipe 2 can be confirmed at two locations on the circumference, and workability is good. By using the retaining member 8, the connecting pipe 2 does not come off before the fastening of the cap nut 4 is completed.

Further, the coil spring portion 5 ″ e exerts an urging force, and the ring portion 5 ″ f is connected to the distal end surface 2 a of the connection pipe 2.
In this case, since the ring portion 5 "f is in contact with the connecting pipe tip surface 2a in the entire circumference from the beginning, the coil spring portion 5" e contracts straight in the coil axial direction without being twisted or bent. Therefore, troubles such as being caught on the tube insertion portion 1b do not occur.

In this embodiment, the stopper locking portion 5 "is used.
g, two guide grooves 6 and two engaging portions 7 are provided, but these may be provided only one by one.

Next, a fourth embodiment will be described with reference to FIG. This embodiment differs from the first embodiment only in the configuration of the retaining member. That is, the retaining member 8 ′ is made of rubber, has a cross section of “<”, and has a ring shape separated at one point on the circumference.
The bent portion of the character "" is fitted in the ring groove 4c so as to face in the direction in which it is pulled out, and its flexibility allows the insertion of the connecting pipe 2 and its frictional force and recovery from the deformed state. The connection tube 2 is prevented from coming off by force.

In each of the above embodiments, the retaining member 8,
Although 8 'is made of rubber, it may be made of any other material such as resin or metal. Also,
In each of the above embodiments, a soft pipe is used as the connection pipe 2, but the present invention can also be applied when the connection pipe is a hard pipe made of stainless steel or the like. In that case, a retainer ring having no protruding teeth on the inner peripheral surface is used instead of the chuck ring 3.

[0034]

As described above, in the connecting pipe joint according to the first aspect, the position of the distal end of the connecting pipe can be confirmed by the position of the stopper, and the insertion length can be controlled to a predetermined amount. Is smaller than a predetermined amount, the cap nut engaging portion engages with the stopper, so that the cap nut cannot be tightened to the pipe insertion portion by the cap nut. Thus, it is possible to effectively prevent problems such as water leakage from between the pipe insertion part and the connection pipe and dropping of the connection pipe from the pipe insertion part.

In the joint of the connecting pipe according to the second aspect, the stopper is provided by providing a coil spring portion wound around the pipe inserting portion and one end of a wire of the coil spring portion raised in the radial direction of the connecting pipe. Since the stopper is used, only one component is required for the stopper, and the cost can be reduced.

Further, a solution of the present invention is to provide a coil spring portion wound around the tube insertion portion, a ring portion fixed to one end of the coil spring portion and abutting against the end face of the connecting tube, Since the coil spring portion is constituted by the locking portion rising from the portion in the radial direction of the connecting pipe, the coil spring portion is contracted straight in the coil axial direction without being twisted or bent, and occurrence of troubles such as being caught by the pipe insertion portion can be prevented.

According to the fourth aspect of the present invention, since the cap nut is provided with a retaining member for preventing the connection pipe from coming off, a force is applied to the connection pipe in the removal direction by the urging force of the stopper or the deformation of the connection pipe. Can prevent the connecting pipe from coming off before the fastening of the cap nut is completed.

[Brief description of the drawings]

FIG. 1 is a front view showing an upper half of a joint according to a first embodiment cut off when a connecting pipe is not inserted;

FIG. 2 is a front view showing an upper half of the joint of the first embodiment cut off when the insertion length of the connecting pipe is a predetermined amount;

FIG. 3 is a front view showing the upper half of the joint of the first embodiment cut off when the insertion length of the connection pipe is equal to or less than a predetermined amount;

FIG. 4 is an exploded perspective view of the joint according to the first embodiment;

FIG. 5 is a longitudinal sectional front view showing a main part of the cap nut of the first embodiment;

FIG. 6 is a perspective view of a body and a stopper according to a second embodiment;

FIG. 7 is a diagram corresponding to FIG. 1 in a second embodiment,

FIG. 8 is a perspective view of a stopper according to a third embodiment;

FIG. 9 is a front view of a stopper according to a third embodiment;

FIG. 10 is a diagram corresponding to FIG. 5 in a fourth embodiment,

FIG. 11 is a front view showing a cut-away upper half of a joint in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body 1b Pipe insertion part 1c Male thread part 2 Connection pipe 2a Tip surface 3 Chuck ring (clamping ring) 4 Cap nut 4c Ring groove 5 Stopper 5a Coil spring part 5b Lock part 6 Guide groove 7 Engagement part 8 Stopper Member 1 'Body 1'b Pipe insertion part 5' Stopper 5 "Stopper 5" e Coil spring part 5 "f Ring part 5" g Locking part 8 'Retaining member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoshi Okada 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd. (72) Inventor Yasuhiro Sawada 4-19-23-106 Nobitome, Niiza-shi, Saitama No. (72) Inventor Inami Hirata 1-1107-136 Ogawacho, Kodaira-shi, Tokyo

Claims (4)

(57) [Claims] 1. A joint of a connecting pipe wherein a connecting pipe inserted into a pipe inserting portion of a body is fastened to the pipe inserting portion via a fastening ring with a cap nut. Provided with a stopper that is urged to abut against and rises in the radial direction of the connection pipe,
A guide groove for allowing the stopper to move in the connecting pipe insertion direction is provided, and the cap nut is provided with an engaging portion that engages with the stopper when the connecting pipe insertion length is equal to or less than a predetermined amount. A joint for a connecting pipe. 2. The stopper according to claim 1, wherein the stopper includes a coil spring portion wound around the tube insertion portion, and a locking portion formed by raising one end of a wire of the coil spring portion in a radial direction of the connection tube. Connection pipe fittings. 3. A coil spring portion wound around the tube insertion portion, a ring portion fixed to one end of the coil spring portion and abutting on the end face of the connection tube, and a stopper rising from the ring portion in the radial direction of the connection tube. The joint for a connection pipe according to claim 1, comprising a locking portion. 4. The connection pipe joint according to claim 1, wherein the cap nut is provided with a retaining member for preventing the connection pipe from coming off.