JPH1182847A - Tube joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tube joint easy to assemble with a small number of part items. SOLUTION: This tube joint consists of a joint body 2, a connecting locking member 1 and an O-ring 3. A locking pawl 11 for locking a tube is provided on the inner peripheral side of a finger 1a of the connecting locking member 1, and a locking protrusion 12 with a first inclined face 17 formed is provided on the outer peripheral side of the finger 1a. The inner peripheral side of a tube insert opening of the joint body 2 is provided with a locking part 21 with a diameter contracting inclined face 21a formed to come in contact with the first inclined face 17 of the locking protrusion 12, and the inside of the joint body 2 is protrusively provided with a diameter enlarged part 22 with a diameter enlarging inclined face 27 for enlarging the inner diameter of the finger part 1a of the connecting locking member 1 in order to pull out the tube. The diameter enlarging inclined face 27 is inclined toward the center of the joint body 2 from the deep part of the joint body 2 toward the tube insert opening of the joint body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a tube joint. More particularly, the present invention relates to a tube joint for quickly connecting and disconnecting a tube for transmitting hydraulic pressure, pneumatic pressure, refrigerant, or the like, which has a small number of parts and is easy to assemble.

[0002]

2. Description of the Related Art Conventionally, in order to transmit hydraulic pressure, air pressure or refrigerant,
A combination of a resin tube and a joint is generally used. While such a tube joint is required to have high sealing properties, it is also required to be easily detachable.

[0003] Conventional joints which can satisfy the requirements of both high sealing performance and easy detachment include a joint main body, a seal packing, a thin plate for retaining a tube, and
A fixing cylinder for fixing the packing and the thin plate,
And an expanding cylinder for expanding the thin plate to remove the tube.

[0004] In this conventional joint, the tube is prevented from coming off the joint by the tube retaining thin plate. However, two cylindrical members are required separately from the joint body for fixing the thin plate and expanding the diameter. Therefore, the conventional joint has a problem that the number of parts is large and the number of assembling steps is large. In addition, since fine parts such as a thin plate for retaining the tube are required, assembly is further troublesome.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a tube joint which has a small number of parts and is easy to assemble.

[0006]

A joint for a tube according to the present invention is a joint for a tube for quickly connecting and disconnecting a tube. The joint for a tube is provided inside the joint body in the axial direction of the joint body. A connection locking member movably disposed along the joint body, and a seal member disposed inside the joint body, wherein the connection locking member includes a plurality of elastic members disposed substantially in a circumferential shape. The finger is provided on the inner peripheral side of the finger and at a portion located inside the joint main body, in order to grip a tube to be connected, is protruded inward from the outer peripheral surface of the tube. A locking claw is formed, and a locking protrusion is formed on the outer peripheral side of the finger. The locking protrusion is inclined toward the center of the connection locking member from the tip of the finger toward the base. With an inclined surface In addition, a locking portion is provided on the inner peripheral side of the tube insertion opening of the joint main body to engage with a locking projection on the outer periphery of the finger. (1) An inclined surface for reducing diameter is formed in contact with the inclined surface, and an inclined surface for increasing diameter for increasing the inner diameter of the finger of the connection locking member for removing the tube is formed inside the joint body. The enlarged diameter portion has a protruding portion extending from the inner portion of the joint body toward the tube insertion port, and the center of the joint body is gradually increased as the inclined surface for increasing diameter extends from the inner portion of the joint body toward the tube insertion port. It is characterized by being inclined to

[0007] The locking pawl has a second inclined to the center of the connection locking member toward the tip of the finger.
Preferably, an inclined surface is formed.

[0008] It is preferable that the locking projection is formed with a third inclined surface which is inclined toward the center of the connection locking member toward the tip of the finger.

It is preferable that the tip of the locking claw is formed to be sharp.

The tube joint of the present invention has only three parts, the joint main body, the connection locking member and the seal member, so that the number of parts is extremely small. Therefore, the number of assembling steps can be reduced.

When a tube is connected to the tube joint of the present invention, if the tube is inserted into the tube insertion opening of the joint body, it is locked by the locking claw on the inner peripheral side of the finger. In addition, even if the tube is pulled by the internal pressure or artificially after connecting the tube, the finger can grip the tube more strongly by the first inclined surface of the locking projection contacting the diameter reducing inclined surface of the locking portion. The tube does not come off the fitting body.

When disconnecting the tube,
When the connection locking member is pushed into the depth of the joint body along the axial direction, the inner peripheral surface of the finger comes into contact with the inclined surface of the enlarged diameter portion inside the joint body to release the locking claw from the tube. Therefore, the tube can be easily removed from the joint body.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a tube joint according to the present invention will be described in detail with reference to the drawings. 1 is a partially cutaway perspective view showing an embodiment of the tube joint of the present invention, FIG. 2 is a cross-sectional view of the tube joint of FIG. 1 taken along the line II-II, and FIG. FIG. 4 is a cross-sectional explanatory view showing a state in which is connected, and FIG. 4 is a cross-sectional explanatory view showing an operation of extracting a tube from the tube joint of FIG.

The tube fitting shown in FIGS.
It comprises a joint main body 2, a connection locking member 1 movably disposed inside the joint main body along the axial direction of the joint main body, and an O-ring 3 as a seal member.

The connection locking member 1 has a plurality of fingers 1a arranged in a substantially circumferential shape. The connection locking member 1 is manufactured by using a material having elasticity such as metal or resin, and integrally forming the fingers 1 a so as to extend in the axial direction from the ring-shaped pressing portion 14. The finger 1a can be bent in the radial direction of the connection locking member 1 like a leaf spring.

A portion located on the inner peripheral side of the finger 1a and inside the joint main body 2 is projected inward from the outer peripheral surface of the tube T in order to grip the tube T (see FIG. 3). A locking claw 11 is provided.

A locking projection 12 is provided on the outer peripheral side of the finger 1a.
Is provided. The outer diameter of the locking projection 12 is set to be larger than the inner diameter of the tube insertion port 25 (specifically, the inner diameter of the locking part 21) and smaller than the inner peripheral part 26 of the joint body 2. The locking projection 12 includes a finger 1a
A first inclined surface 17 is formed which is inclined toward the center of the connection locking member 1 from the front end toward the base.

On the outer peripheral surface of the connection locking member 1, a straightening portion 13 for correcting the connection locking member 1 when the connection locking member 1 is mounted on the joint body 2 is formed.

The straightening portion 13 is a portion for minimizing the looseness of the connection locking member 1 when the connection locking member 1 is press-fitted into the joint body 2 and the tube T is inserted. When the tube T is pulled out, the connection locking member 1 does not expand when the tube T is pulled out, and the tube T does not come off. For this reason, the outer diameter of the correction section 13 is equal to the inner diameter of the tube insertion port 25 (specifically, the locking section 21).
Is defined to be approximately the difference between the inner diameter of the locking claw 11 and the outer diameter of the tube T.

The pressing portion 14 is a portion that comes into contact with a finger or a jig used as appropriate when the connection locking member 1 is pushed into the depth of the joint body 2. The holding portion 14 makes it easier to move the connecting and locking member 1 when removing the tube T, and also makes it easier to press-fit the connecting and locking member 1 into the joint body 2 during assembly.

The joint body 2 has a locking portion 21 for preventing the connection locking member 1 from coming off, an enlarged diameter portion 22 for expanding the diameter of the finger 1a of the connection locking member 1, and an O-ring 3. It has an O-ring groove 23 and a tube insertion stopper 24 for fitting.

On the inner peripheral side of the tube insertion opening 25 of the joint main body 2, a locking portion 21 for engaging with the locking projection 12 on the outer peripheral side of the finger 1a is provided. In the locking part 21,
A diameter-reducing inclined surface 21 a that is in contact with the first inclined surface 17 of the locking projection 12 is formed.

The inside of the joint body 2 has an enlarged diameter portion 2 having an inclined surface 27 for increasing the diameter of the finger 1a of the connecting and locking member 1 for removing the tube T.
2 protrudes from the back of the joint body 2 toward the tube insertion port 25. The diameter-increased inclined surface 27 is connected to the joint body 2.
Is inclined toward the center of the joint main body 2 as it goes from the back to the tube insertion port 25.

As shown in FIG. 3, the outer diameter A of the distal end of the enlarged diameter portion 22 is smaller than the inner diameter B of the distal end of the connection locking member 1 when the tube T is inserted into the joint body 2. Is set to

The locking claw 11 inside the connection locking member 1 has a second inclined surface 15 which is inclined toward the center of the connection locking member 1 toward the tip of the finger 1a. Easy to insert.

The locking projection 12 outside the connection locking member 1
Has a third inclined surface 16 which is inclined toward the center of the connection locking member 1 toward the tip of the finger 1a, so that the connection locking member 1 can be easily pressed into the joint body 2.

Further, since the distal end 18 of the locking claw 11 is formed sharp, it is easy to insert the tube T into the tube T, which is advantageous against the tube coming off.

In this embodiment, as an example of the sealing member, O
Although a ring has been described as an example, the present invention is not limited to this, and a conventionally used packing or the like can also be used as the sealing member.

As a tube connected to the tube joint of the present invention, a resin tube such as nylon used for transmitting hydraulic pressure, pneumatic pressure, or refrigerant is mainly applied, but the present invention is not limited to this. Not a thing,
The present invention can be applied to a metal tube by forming a groove in the metal tube so that the locking claw 11 fits into the tube. It is applicable to a rubber hose, but it is necessary to reinforce a portion gripped by the locking claw 11 to prevent a decrease in durability.

The tube joint of the present invention can hold and release the tube with a single connection / locking member. Therefore, the tube joint can be composed of only three parts: the joint body, the connection / locking member, and the seal member. Very few parts are required. Therefore, the number of assembling steps can be reduced.

When a tube is connected to the tube joint constructed as described above, the tube T is connected to the joint body 2 until the distal end of the tube T comes into contact with the tube insertion stopper 24 as shown in FIG. Tube insertion port 25
Just plug it in. As a result, the connection locking member 1 is locked by the locking claw 11 of the finger 1a. The O-ring 3 arranged on the joint main body 2 serves as a seal for the connected tube T.

When a medium such as air is transmitted to the inside of the tube T after the connection of the tube T, the internal pressure of the tube T increases and a tensile force is applied to the tube T. At this time, since the locking projection 12 on the outer peripheral side of the finger 1 a engages with the locking portion 21 on the inner peripheral side of the joint body 2, the connection locking member 1 does not come off from the joint body 2. In addition, the first of the locking projections 12
The finger 1 a is pressed by the joint body 2 toward the center of the tube T when the inclined surface 17 comes into contact with the diameter reducing inclined surface 21 a of the locking portion 21. Thereby, the locking claw 11 on the inner peripheral side of the finger 1a grips the tube T more strongly. Therefore, the tube T
Is harder to come off from the joint body 2.

On the other hand, when the connection of the tube T is released, as shown in FIG. 4, the connection locking member 1 may be pushed into the joint body 2 along the axial direction. At this time,
The inner peripheral surface of the finger 1 a is the enlarged diameter portion 22 inside the joint body 2.
The finger 1a is moved by the joint body 2 in a direction away from the tube T (a direction in which the diameter is increased) by contacting the inclined surface 27 for diameter expansion. Thereby, the locking claw 11 on the inner peripheral side of the finger T is detached from the tube T, so that the tube T can be easily pulled out from the joint.

[0034]

According to the present invention, the number of parts is very small because it is composed of three parts, the joint body, the connection locking member and the seal member. Therefore, the number of assembling steps can be reduced. In addition, since there are no fine parts as in the case of a conventional joint, manufacture is easy.

The hose joint of the present invention can be connected only by inserting the hose into the joint body. On the other hand, when disconnecting the hose, it is only necessary to push out the hose while pushing the connection locking member into the joint body. Very easy to connect and disconnect.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing one embodiment of a tube joint according to the present invention.

FIG. 2 is a sectional view taken along the line II-II of the tube joint of FIG.

FIG. 3 is an explanatory sectional view showing a state where a tube is connected to the tube joint of FIG. 1;

FIG. 4 is an explanatory sectional view showing an operation of extracting a tube from the tube joint of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Connection / locking member 1a Finger 2 Joint body 3 O-ring 11 Locking claw 12 Locking projection 17 First inclined surface 21 Locking portion 21a Increasing surface for reducing diameter 22 Increasing surface portion 27 Increasing surface for increasing diameter T tube

Claims (4)

[Claims] 1. A joint for a tube for quickly connecting and disconnecting a tube, comprising: a joint main body; and a connection lock disposed inside the joint main body so as to be movable along an axial direction of the joint main body. And a seal member disposed inside the joint main body, wherein the connection locking member includes a plurality of elastic fingers disposed in a substantially circumferential shape, and among the fingers, On the peripheral side and at a portion located inside the joint main body, a locking claw is formed to protrude inward from the outer peripheral surface of the tube in order to grip a tube to be connected, and the outer peripheral side of the finger is formed. Has a first inclined surface that is inclined toward the center of the connection engagement member from the tip of the finger toward the base, and the engagement projection has a first inclined surface. Inner circumference of tube insertion port Is provided with a locking portion for engaging with a locking projection on the outer peripheral side of the finger, and the locking portion is formed with an inclined surface for reducing the diameter that comes into contact with a first inclined surface of the locking projection. In the interior of the joint body, a diameter-enlarging portion having an inclined surface for expanding the diameter of the finger of the connection locking member for removing the tube is provided from the back of the joint body. Projecting toward the tube insertion port,
A tube joint, wherein the diameter-increased inclined surface is inclined toward the center of the joint body as it goes from a deep portion of the joint body toward the tube insertion opening. 2. The joint for a tube according to claim 1, wherein the locking claw is formed with a second inclined surface that is inclined toward the center of the connection locking member toward the tip of the finger. 3. The tube joint according to claim 1, wherein the locking projection is formed with a third inclined surface which is inclined toward the center of the connection locking member toward the tip of the finger. 4. The tube joint according to claim 1, wherein a tip of the locking claw is formed sharp.