JPH01275991A - Pipe fitting - Google Patents

Abstract

PURPOSE:To keep holding force for a pipe body so favorably to repetitive setting and torsion by installing each notch in respective claw piece base parts, and holding a ring base part by a holding ring with a projection being engaged with these notches. CONSTITUTION:A pipe fitting performs separation of a pipe body by means of a ring holding device 3, where plural numbers of claw pieces 3b being tilted in the pipe body inserting direction and holding a pipe body by biting into an outer circumferential surface of this pipe body are installed toward the center, an open cylinder 5 existing in and around this holding device 3 and separating a biting part of the said claw piece from the pipe body outer circumferential surface after contacting with the claw piece 3b of the holding device 3 at the time of pipe body separation. The holding device 3 has notches 3c in each base part of these claw pieces 3b, and it holds a ring base 3a by a holding ring 8 with a projection being engaged with these notches 3c.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention of this application relates to a pipe joint used for a pipe body made of plastic or rubber, and more specifically, a pipe joint that allows the pipe body to be repeatedly attached and detached, and is especially durable. Regarding pipe fittings.

[Conventional technology]

In recent years, pipe fittings have become popular as pipe fittings for connecting flexible pipe bodies such as plastic duplexes or rubber tubes because of their ease of handling, as they allow the pipe bodies to be easily attached and detached without the use of tools. Widely used in six types of equipment. Typical pipe joints of this type include, for example, Utility Model Application No. 61-145188, Utility Model Application No. 60-198
As shown in No. 87, it is inclined in the direction of tube insertion,
A ring-shaped gripping tool has a plurality of claws arranged at equal intervals toward the center of the tube by biting into the outer circumferential surface of the tube; There is a type of pipe fitting in which the pipe body is attached and detached using an open tube that comes into contact with the claw piece and separates the biting part of the claw piece from the outer peripheral surface of the pipe body. The pipe body is fixed to the joint main body by simply pressing the pipe, and in this fixed state, the pipe body can be removed from the joint main body by pushing the open cylinder in the pipe body insertion direction.

[Problem to be solved by the invention]

However, in such conventional pipe joints, a toothed washer is secured to the joint body at the annular base with a slight space left between the step inside the joint body and the end surface of the holding cylinder. The gripping tool has each claw piece bent in the tube insertion direction with respect to the disc-shaped annular base, so it is prone to repeated attachment and detachment of the tube or excessive tension in the tube withdrawal direction. Therefore, stress tends to be concentrated on the roots of the claw pieces, and especially when used in industrial robots, large loads such as tension, twisting, and impact are applied to the joints, so the gripping tool is subject to even greater stress. concentrate. As a result, the annular base between the claw pieces, which is weak in strength, is damaged, and the annular base is deformed, protrudes from a predetermined position within the joint body, and falls off.

In view of the problems of the prior art, the purpose of this application is to provide a pipe joint in which the gripping tool does not fall off and the gripping force of the pipe body is well maintained against repeated attachment and detachment, twisting, etc. .

[Means to solve the problem]

In order to achieve the above object, the pipe joint according to the first invention of this application includes a joint body into which a pipe body can be inserted into a hollow portion, and a pipe disposed within the joint body for biting into the outer periphery of the pipe body and gripping the pipe body. A gripping tool having a plurality of claw pieces on the inner peripheral edge side of the annular base that are inclined in the direction of insertion into the body, and the gripping tool is internally fitted into the end of the joint body on the side of the tube body insertion port and is connected between the gripping tool and the step part in the joint body. A presser cylinder that holds the presser cylinder, which is slidably fitted into the presser cylinder, and whose tip part pushes down the claws of the gripper toward the inner wall of the joint body, thereby preventing the claws from biting into the outer circumferential surface of the pipe body. In the pipe joint, the pipe joint includes an opening cylinder to be released, and a seal ring that contacts and holds the outer circumference of the pipe body that is fitted into the hollow part of the joint body in contact with the hollow part of the joint body. The annular base is held by a retaining ring having a notch and a protrusion that engages with the notch.

Furthermore, according to the second invention of this application, there is provided a joint body into which a pipe body can be inserted into the hollow portion, and a plurality of joint bodies which are provided in the joint body and are inclined in the pipe body insertion direction for biting into the outer periphery of the pipe body and gripping the pipe body. a gripping tool having a claw piece on the inner circumferential edge side of the annular base; a presser cylinder that fits inside the end of the joint body on the side of the pipe insertion port and holds the gripping tool between it and a step in the joint body; an opening cylinder which is slidably fitted into the presser cylinder and whose tip part pushes down the claws of the gripper toward the inner wall of the joint body to release the claws from biting into the outer circumferential surface of the tube; In a pipe joint that includes a seal ring that contacts and holds the outer periphery of an inserted pipe body in contact with a hollow part of a joint body, the gripping tool clamps and holds the annular base part from an axial direction. It is characterized by having a cross-sectional simplified U-shaped clamping ring.

[Operation] In the first invention of this application, the gripping tool has notches at the base of each claw, and the annular base is held by a retaining ring having projections that engage with these notches. Therefore, even if the annular base of the gripper is cut in the radial direction at the portion between the claw pieces due to an external force such as a screw if or tension being applied to the connection part with the tube, the gripper will not be able to hold the protrusion of the retaining ring. Due to the engagement of the annular base with the notch provided at the base of the claw piece, the shape of the annular base is maintained without deformation, and each claw piece is supported by the protrusion and does not fall out of its designated position, so it can be used for a long time. can do.

Further, in the second invention of this application, the gripping tool includes a gripping ring having a substantially U-shaped cross section that clamps and holds the annular base portion from the axial direction. That is, since the gripping tool is held between the claws of the annular base where external force tends to concentrate due to its weak strength, or by the clamping ring, when the annular base is cut in the radial direction by external force, Since each part is held by the clamping ring, the shape of the annular base is maintained and at least the claw pieces do not fall off. Furthermore, if you apply pressure only between the claws of the annular base and do not apply pressure to other parts, or if you apply pressure more strongly to the part between the claws than other parts, the entire circumference of the annular base can be uniformly pressed. Compared to the case where the clamping force is applied to the claws, the effect of holding the annular base between the claws is enhanced, and the springiness of the claws is also increased.

〔Example〕

FIG. 1 is a partial longitudinal sectional side view showing an embodiment of a pipe joint according to the first invention of this application, and the illustrated pipe joint l is
It is composed of a joint body 2, a gripper 3, a holding cylinder 4, an open cylinder 5, a seal ring 6, and a protrusion ring 7 and a retaining ring 8 that are used integrally with the gripper 3.

The joint body 2 has two steps 2a and 2b formed on its inner wall surface, and an annular ring 7792c for receiving the seal ring 6 between these two steps 2a and 2b. An engaging portion 2d for fitting and fixing the presser cylinder 4 is formed on the open end side.

The presser cylinder 4 is provided with an annular protrusion 4a on the outer periphery of one end that engages with the engagement part 2d of the joint body 2, and the annular protrusion 4a is connected to the engagement part 2d of the joint body 2. It is fitted and fixed into the joint body 2 by press-fitting or the like.

As shown in the most detail in FIG. 2, the gripping tool 3 has a toothed washer-like shape, and a ring protrudes toward the center at a predetermined distance from the inner peripheral edge of its annular base 3a. A plurality of claw pieces 3b are provided that are inclined toward the insertion direction of the tubular body, and three claw pieces 3b are provided between the bases of each claw piece 3b on the inner peripheral edge side of the annular base 3a.
Notches 3c.

3c and 3c are formed. The gripping tool 3 has a substantially U-shaped cross section and is provided with a protrusion ring 7 provided on the inner peripheral edge side of one end surface in the axial direction with a protrusion 7a that engages with each notch 3c of the gripping tool 3. It is clamped and pressed from the axial direction by a ring 8, and these are fixed together to form one annular body, which is rotatably interposed between the end face of the presser cylinder 4 and the stepped portion 2a of the joint body 2. .

The open cylinder 5 has a slope 5a formed at the end facing the gripping tool 3 when it is slidably fitted into the holding cylinder 4, and a slope 5a at the other end when the open cylinder 5 is pushed into the joint body. A Franz 5b serving as a suppressor is provided.

The seal ring 6 is an O-ring that is fitted into the annular groove 2C of the joint body 2, and when the tube T is inserted into the joint body 2, the seal ring 6 is an O-ring, and when the tube T is inserted into the joint body 2, the seal ring 6 is an O-ring. Airtightness is maintained through elastic contact. Note that the seal ring may have other shapes, such as a U-shaped cross section, for example.

To attach the tube T to the pipe joint 1 configured in this way, the tube T is inserted into the open tube 5. As it is inserted, the tube body T
The tip first contacts the claw piece 3b of the gripper 3, and pushes the claw piece 3b against the elasticity of the claw piece 3b toward the inner wall surface of the joint body 2, and then touches the inner circumferential surface of the seal ring 6. The tubular body T is attached to the joint body 2 by sliding into the joint body 2 and coming into contact with the stepped portion 2b in the joint body 2. In this state, the claws 3b of the gripper 3 are in pressure contact with the tube T due to their elasticity, so if you try to pull out the tube T,
The tip of the claw piece 3b bites into the tubular body T, acts on the hand, and firmly holds the tubular body T by preventing it from being pulled out.

When this pipe joint 1 is used, for example, in an industrial robot, an external force such as tension or twist is applied to the joint, and the gripping tool 3
When the gripping tool 3 is cut in the radial direction between the claw pieces 3b of the annular base 3a, which is weak in strength, the notch 3c at the base of the claw piece 3b engages with the protrusion 7a of the protrusion ring 7 attached to the retaining ring 8. Since the annular base 3a is held together and does not deform, there is no possibility that the annular base will be deformed by cutting the annular base in multiple radial directions and the claws etc. will fall off from their predetermined positions within the joint body, unlike in the conventional case. Things will go away. Therefore, the life of the pipe fitting is significantly extended. Note that it is of course possible to reverse the positions of the protrusion ring 7 and the gripper 3 to those shown in FIG.

The retaining ring does not have to have its protrusions formed separately as a protruding ring, and as shown in FIG. 3, the retaining ring 10
A protrusion 10a is directly provided on the end face of the gripper 9, and an arcuate notch 9c provided on the inner peripheral edge side between the claw pieces 9b of the annular base 9a of the gripper 9 is engaged with the protrusion 10a. The same effect can be obtained even if the ring 10 is folded back from one end and grips the gripping tool 9.In addition, in either the embodiment shown in FIG. 2 or 3, the protrusion and its associated Of course, it is possible to change the shape, number, etc. of the notches of the fitting tool, and if the gap between the step 2a of the joint body 2 and the end surface of the presser cylinder 4 is appropriately selected, the retaining ring 8 can be changed.
．． 10 can be folded back from one edge and used without holding the gripping tools 3 and 9.

FIG. 4 shows still another embodiment of the pipe joint according to the first invention. Note that the description of parts that overlap with the pipe joint 1 of the embodiment in FIG. 1 will be omitted. In the illustrated pipe joint 15,
A plurality of protrusions 11a are provided on the end surface of the presser cylinder II, and by engaging the protrusions 11a with notches provided between the claw pieces 12b of the gripper 12, the annular base 12 of the gripper 12
a, and in this case, the presser cylinder 11 plays the role of a retaining ring.

FIG. 5 is a plan view of a gripper used in a pipe joint according to the second invention of this application. The illustrated gripper 20 is
Grip tool 3 used in the pipe joint according to the second invention
, 9, the annular base has a plurality of inclined claw pieces 20b at equal intervals on the inner peripheral edge side, and here, the gripping tool 20 is held from the axial direction by a gripping ring 21 whose cross section is approximately U-shaped. has been done. This clamping ring 21 does not have the protrusion 10a like the retaining ring 10 of the embodiment shown in FIG. An example of this is shown. The gripping tool 20 to which the gripping ring 21 is attached is attached to the joint body 20, for example, as in the embodiment shown in FIG.
It is used by being interposed between the step portion 2a and the end surface of the presser cylinder 4.

That is, in the gripping tool 20 used in the second invention, the annular base 2. Since the shape of Oa is maintained, the annular base 20
Even if a is cut in the radial direction at a plurality of locations, it will not fall off from a predetermined position within the joint body, similar to the surface-engraved second aspect of the invention.

Therefore, even under severe usage conditions, the gripping force is maintained satisfactorily over a long period of time.

Furthermore, in the second invention, the claw piece 2 of the annular base 20a
Only the part between the Obs is held by the holding ring 2I,
If the annular base 20a at the rear of each claw piece 20b has a structure in which it is not clamped, there is an effect that the springiness of the claw piece 20b is increased. Note that the rear part of the claw piece 20b may be slightly clamped, or the annular base 20a may be clamped uniformly over the entire circumference.

〔Effect of the invention〕

As explained above, in the first invention of this application, the plurality of claws that are inclined in the tube insertion direction and grip by biting into the outer peripheral surface of the tube are arranged at predetermined intervals toward the center. An annular grip provided therein, and an open cylinder located near the grip that abuts the claws of the grip when the tube is detached, and detaches the biting portions of the claws from the outer circumferential surface of the tube. In a type of pipe joint for separating the pipe body, the gripping tool has a notch at the base of each claw, and the annular base is held by a retaining ring having a protrusion that engages with the notch, and In the second invention, since the gripping tool has a gripping ring having a substantially U-shaped cross section that clamps and holds the annular base portion from the axial direction, the gripping tool can have any configuration. The annular base is held in a predetermined shape, so that even if the annular base of the gripper is severed due to an external force such as twisting or tension on the joint, the gripper, especially its claws, will not fit inside the joint body. The effect is that the life of the pipe joint is significantly extended without it coming off the predetermined position.

Note that the first invention and the second invention of this application are not limited to the examples, and modifications may be made within the technical idea of each invention, such as changing the shape, number, etc. of the claw pieces of the gripping tool. Various modifications are of course possible.

[Brief explanation of the drawing]

FIG. 1 is a partial longitudinal sectional side view of a pipe joint according to the first invention of this application, and FIG. 2 is a partially cutaway view of a gripping tool and a retaining ring used in the pipe joint of the embodiment shown in FIG. FIG. 3 is a partially cutaway perspective view of a gripping tool and a retaining ring used in another embodiment, and FIG. 4 is a partial longitudinal sectional side view of yet another embodiment. 5 is a plan view of a gripping tool and a clamping ring used in a pipe joint according to the second invention of this application, FIG. Figure 7 is the same <
It is an I3-B arrow sectional view. 2; Joint body, 3.9. I2.20: Grip tool, 3a, 9
a, l 2a, 20a/cyclic base, 3b, 9b, I 2
b, 20b: claw piece, 3c, 9c: notch, 4. +1
: presser cylinder, 5-open cylinder, 6; seal ring, 7: protrusion ring, 8.10: retaining ring, 21. clamping ring. Patent Applicant Junko Co., Ltd. File, f/Mi°Rai Brother A: a, S Sonog f;1.2 3c

Claims (2)

[Claims] (1) A joint body into which a pipe body can be inserted into the hollow part, and a plurality of claws located inside the joint body and inclined in the direction of pipe insertion for biting into the outer periphery of the pipe body and gripping the pipe body, on the inner peripheral edge side of the annular base. a holding tool which is fitted into the end of the fitting body on the side of the tube body insertion port and holds the holding tool between the fitting body and a step in the fitting main body; an open cylinder that is fitted and whose tip part pushes down the claw piece of the gripper toward the inner wall of the joint body to release the claw piece from biting into the outer peripheral surface of the pipe body; In the pipe joint, the gripping tool has a notch at the base of each claw piece, and a protrusion that engages with the notch. A pipe joint characterized in that an annular base is held by a retaining ring. (2) A joint body into which a pipe body can be inserted into the hollow part, and a plurality of claws located inside the joint body and inclined in the direction of pipe insertion for biting into the outer periphery of the pipe body and gripping the pipe body, on the inner peripheral edge side of the annular base. a holding tool which is fitted into the end of the fitting body on the side of the tube body insertion port and holds the holding tool between the fitting body and a step in the fitting main body; an open cylinder that is fitted and whose tip part pushes down the claw piece of the gripper toward the inner wall of the joint body to release the claw piece from biting into the outer peripheral surface of the pipe body; In the pipe fitting, the gripping tool includes a gripping ring having a substantially U-shaped cross section that holds the annular base by clamping it from the axial direction. A pipe fitting characterized by comprising: