JP2813552B2 - 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 pipe joint.

[0002]

2. Description of the Related Art Various types of pipe joints for connecting a fluid flow pipe to a pressure device or the like are known. FIG. 8 is a front sectional view showing the general pipe joint 100. The configuration of the pipe joint 100 will be described with reference to FIG. Reference numeral 102 denotes a tubular joint body, on the left end side of which is formed a screw portion 104 for screwing the joint 100 itself to a pressure device (not shown) or the like. The joint body 102 is manufactured by cutting, and therefore, brass having good machinability is generally used as a material.

Reference numeral 106 denotes a guide cylinder, the left end of which is inserted into the right end of the joint body 102 and connected by means such as caulking. The guide cylinder 106 is also formed using brass having good machinability. The guide cylinder 106 is fixed to the joint body 102 by caulking. Also, 1
Reference numeral 08 denotes a ring-shaped stopper, which is formed by using brass having good machinability, and is fixed to the inside of the left end side of the guide cylinder 106 by caulking. Reference numeral 110 denotes an open cylindrical body made of a synthetic resin material.
It is slidably inserted along the axial direction.

Reference numeral 112 denotes a ring-shaped lock claw, which is formed using an elastic thin (about 0.2 mm) metal flat plate (such as phosphor bronze). Lock claw 112
Is provided inside the guide cylinder 106 and at the right end of the stopper 108, and has a plurality of elastic locking pieces 114 extending inward of the guide cylinder 106. Elastic locking piece 11
Reference numeral 4 has a function of cutting into the outer wall of a synthetic resin tube (not shown) inserted from the right end along the inner peripheral surface of the open tubular body 110, preventing the tube from being pulled out, and preventing the tube from being pulled out. When the open cylinder 110 is pushed into the guide cylinder 106, the elastic locking pieces 11 are inserted at the insertion end of the open cylinder 110.
4 is pushed in the direction of the stopper 108, the biting of the tube into the outer wall is released, and the tube can be pulled out. Reference numeral 116 denotes a seal ring formed of a rubber material into a ring shape, which is in close contact with the outer wall of the inserted tube to prevent fluid leakage.

[0005]

However, the above-mentioned conventional pipe joint has the following problems. Joint body 10
2. Since the guide cylinder 106 and the stopper 108 are manufactured by cutting, it takes time to manufacture. Further, in manufacturing the pipe joint 100, first, the guide cylinder 10
6, it is necessary to fix the lock claw 112 and the stopper 108 by caulking the end of the guide cylinder 106 (the left end in FIG. 8), and also fix the guide cylinder 106 to the joint body 102 by caulking. It takes more time to manufacture. Also,
Brass with good machinability is used in consideration of workability, but brass is a substance harmful to the human body when corroded (green-blue)
May change. In particular, when rust such as patina occurs on the inner peripheral surface of the guide cylinder 106, it becomes difficult to smoothly slide the open cylinder 110 along the axial direction.
Insertion and removal of the tube cannot be performed easily. In addition, rust may enter the fluid. Furthermore, for example, when the fluid is at a high temperature, the open cylinder 110 needs to be made of brass in consideration of the temperature. In this case, there is a possibility that the open cylinder 110 may also be rusted. is there. For this reason, there also arises a problem that the possibility that rust generated on the contact surface between the guide cylinder 106 and the open cylinder 110 is mixed into the fluid is further increased. For this reason, stainless steel that does not generate rust may be used instead of brass, but stainless steel has high hardness and is difficult to cut, and even if cutting is performed, the production cost is high. There is a problem of rising. Therefore, an object of the present invention is to provide a pipe joint that can be manufactured in a short time without using cutting.

[0006]

To solve the above-mentioned problems, the present invention has the following arrangement. That is, a tubular joint main body, a guide cylinder body whose one end side can be connected to one end side of the joint main body, and a plurality of elastic members disposed inside the guide cylinder body and extending inward of the guide cylinder body. A ring-shaped lock claw having a stop piece and an inner peripheral surface on the other end side of the guide cylinder are slidably inserted along the axial direction, and the insertion end can push the elastic locking piece. And a pipe joint having an open tubular body,
The guide cylinder and the open cylinder are formed by drawing using a metal material, and the insertion end of the open cylinder is formed.
An engagement hole having a predetermined length in the axial direction is formed on the outer peripheral surface of
A plurality is formed along the circumferential direction, and
And is engaged with the engagement hole,
Engagement projection that regulates movement of the body in the axial direction to a predetermined distance
Is formed.

If this configuration is adopted, the guide cylinder, the open
Shorter production time because there is no need to cut down the cylinder
It is possible to reduce the manufacturing cost. Further
In addition, it is easy to insert the open cylinder into the guide cylinder.
In addition, it is possible to prevent the open cylinder from coming off the guide cylinder
It is. Specifically, the engagement protrusion is connected to the guide cylinder.
The tip of one end is bent inside the guide tube.
It is good to make a tongue piece.

[0008] One end of the guide cylinder connected to the joint body is formed so as to have a larger diameter so as to be fitted to an outer peripheral surface of one end of the joint body, and an outer peripheral edge of the lock claw is formed in the joint body. The lock claw can be held with a simple structure if it is fitted and held in an annular groove formed between one end face of the base and the inner end face of the enlarged diameter portion. In addition, the lock claw is provided with a number of radial cuts alternately from each of an inner peripheral edge and an outer peripheral edge thereof to form the elastic locking piece,
If the outer peripheral side is configured to be bent in the insertion direction of the open tubular body over a certain width, when the lock claw that bites into the tube is released, the radial cut causes the elastic locking piece to deform in the axial direction. Can act as an escape for. In addition, if the outer peripheral side is bent in the insertion direction of the open tubular body over a certain width, the overall strength of the lock claw formed in a zigzag shape can be increased.

[0009] One end of the guide cylinder connected to the joint body is formed to have a larger diameter so as to be fitted to the outer peripheral surface of one end of the joint body, and the outer peripheral edge of the lock claw is formed to have a constant width. Over the one end side outer peripheral surface of the joint main body so that the bent portion can be clamped between the one end side outer peripheral surface of the joint main body and the inner peripheral surface of the guide cylindrical body. The positioning of the nail can be easily performed.

[0010]

The guide cylinder and the open cylinder of the pipe joint are formed by drawing using a metal material. Therefore, it is not necessary to cut the guide cylinder and the open cylinder, so that the production time can be reduced and the production cost can be reduced. Further, the outer peripheral surface of the insertion end of the open cylindrical body has a shaft.
An engagement hole having a predetermined length in the line direction is formed along the circumferential direction.
Number is formed, and the guide cylinder extends inward
Engage with the engagement hole to move the open cylinder in the axial direction
Since the engaging projection that regulates the distance is formed, the open cylinder
The body can be easily inserted into the guide cylinder and the open cylinder
The body can be prevented from coming off the guide cylinder.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The same components as those of the conventional example are denoted by the same reference numerals, and description thereof will be omitted. First Embodiment First, the structure of the pipe joint 10 will be described with reference to FIGS. 1, 3, 4, and 5. FIG. Reference numeral 12 denotes a tubular joint main body, on which a thread portion 14 for screwing the pipe joint 10 itself to a pressure device (not shown) or the like is formed on the outer peripheral surface on the left end side, and a circumferential groove 16 is formed on the outer peripheral surface on the right end side. Is formed. The joint body 12 is manufactured by cutting, and therefore, brass having good machinability is generally used as a material. It should be noted that only the right end connected to a guide cylinder described later may be formed of a cylinder using a synthetic resin material.

Reference numeral 18 denotes a guide cylinder, which is formed by drawing using stainless steel. Guide cylinder 18
Is formed such that one end side (the left end side in FIGS. 1 and 3) is enlarged in diameter so as to be fitted to the outer peripheral surface on the right end side of the joint body 12 (hereinafter simply referred to as an enlarged diameter portion 20). The enlarged diameter portion 20 includes the joint body 1
An annular protruding portion 22 that fits into the circumferential groove 16 provided in the protruding portion 2 protrudes inward and is formed over the entire circumference. The protruding portion 22 and the above-described peripheral groove 16 do not necessarily need to be formed over the entire circumference, but may be formed only partially.
Further, the connection of the guide cylinder 18 to the joint body 12 may be performed by press-fitting the right end side of the joint body 12 into the enlarged diameter portion 20. On the other end side (the right end side in FIGS. 1 and 3), an engagement protrusion 24 extending inward is formed. The engaging projection 24 is formed as a cut-out tongue piece having a distal end located on the left end side of the guide cylinder 18 bent inward of the guide cylinder 18. In this embodiment, the engaging projection (notched tongue piece) 24 is formed in a rectangular shape by cutting or punching out the peripheral portion in a U-shape, but it has various shapes such as a triangular shape and a semicircular shape. Is also good. The tip of the cutout tongue piece 24 made of stainless steel can be resiliently swung in an arc around the joint.

An open cylinder 26 is formed by drawing using stainless steel. The outer diameter of the open cylinder 26 is formed to be slightly smaller than the inner diameter on the right end side of the guide cylinder 18 and is slidably inserted along the axial direction on the inner peripheral surface on the right end side of the guide cylinder 18. . In addition, the outer peripheral surface of the insertion end of the open cylindrical body 26 has a predetermined length in the axial direction,
The same number of engaging holes 28 that engage with the tip portions of the notch tongues 24 are formed in the circumferential direction corresponding to the notch tongues 24.
The method of inserting the open tubular body 26 into the guide tubular body 18 is performed by expanding the open tubular body 26 from the right end side of the guide tubular body 18 to the leading end of the cutout tongue piece 24 at the insertion end side of the open tubular body 26. Just insert it. When the open tubular body 26 is inserted and the leading end of the notch tongue piece 24 reaches the position of the engaging hole 28, the leading end part of the notch tongue piece 24 whose diameter is expanded enters the engaging hole 28 by elasticity. As a result, the notch tongue piece 24 and the engaging hole 28 are engaged, and the open tubular body 26 is irremovably inserted into the guide tubular body 18. After the insertion, the open cylindrical body 26 is substantially
, The movement in the axial direction is restricted. In addition, an engagement hole (not shown) is provided in the guide cylinder 18 in place of the cutout tongue piece 24, and extends to the outer right end direction in the open cylinder 26.
A notched tongue piece that enters and engages with the engagement hole may be provided.

The lock claw 112 has the same configuration as that of the conventional example, and is specifically formed in a shape as shown in FIGS. The structure will be described in detail.
Reference numeral 2 denotes a ring-shaped flat plate made of metal (phosphor bronze or the like), and a large number of radial cuts are alternately provided from the inner peripheral edge and the outer peripheral edge, so that the lock claw 112 has a zigzag outer shape. Elastic locking piece 1 extending toward
14 are formed. The outer peripheral edge side of the lock claw 112 is bent toward the insertion direction side of the open tubular body 26 over a certain width. The outer circumferential edge of the lock claw 112 is formed in an annular groove 3 formed between the right end face of the joint body 12 (a right end face of a stopper described later in detail) and the inner end face of the enlarged diameter portion 20.
0 is fitted and held. Reference numeral 32 denotes a stopper, which is formed in a tapered shape by drawing using stainless steel, and its peripheral portion is sandwiched between the right end surface of the joint body 12 and the inner end surface of the enlarged diameter portion 20 to form a guide cylinder. Body 18
It is fixed inside. The stopper 32 is a lock claw 1
When the elastic locking piece 114 formed on the base 12 is pushed by the insertion end of the open tubular body 26, the elastic locking piece 114 abuts on the right end face of the stopper 32 so as not to be deformed beyond its elastic limit. It is to make. The stopper 32 has such a shape that its diameter is sequentially reduced along the insertion direction of the open tubular body 26. A seal ring 36 made of an elastic material such as synthetic rubber is disposed between the first step 34 formed inside the joint body 12 and the stopper 32.

In the above configuration, the joint body 12
When the tube 38 is inserted from the direction of the open cylinder 26 into the inside,
The tube 38 moves while pushing the elastic locking piece 114 apart from the outer wall surface of the tube 38 while resisting the elastic force. Then, the tube 38 is inserted to a predetermined position where the distal end abuts on a second step portion 40 provided inside the joint body 12. The outer peripheral edge side of the lock claw 112 is bent toward the insertion direction side of the open tubular body 26 over a certain width. For this reason, the distal end portion of the elastic locking piece 114 is entirely deformed with the outer peripheral edge as a fulcrum (the connecting portion of the elastic locking piece 114 is deformed by being twisted), but near the base of the bent portion (FIG. 4), and the elastic locking piece 114 itself is strengthened, so that the elastic locking piece 114 can be surely cut into the tube 38. Further, the strength of the entire lock claw 112 is increased and a strong spring property is generated, so that the tube 38 can be more effectively prevented from being pulled out.

Next, the attached tube 38 is connected to the pipe joint 1.
In order to remove the elastic locking piece 114 from the zero, if the open cylindrical body 26 is moved to the left, the insertion end of the open cylindrical body 26 pushes the elastic locking piece 114 of the lock claw 112 to the left. 114
Biting into the outer wall of the tube 38 is released, and the tube 38 can be removed. Note that when releasing the lock claw 112 cut into the tube 38, the radial cut can act as a relief for the elastic locking piece 114 to be deformed in the axial direction, so that a reliable releasing operation can be performed. As described above, since the guide cylinder 18 and the open cylinder 26 are formed by drawing, they can be manufactured in a shorter time than the conventional manufacturing by cutting. In addition, since cutting is not required, it is possible to use stainless steel, which cannot be easily cut, and rust does not occur on sliding portions such as the guide cylinder 18 and the open cylinder 26. The product life of the joint 10 itself is prolonged. Further, rust can be prevented from being mixed into the fluid.

Second Embodiment Next, a second embodiment will be described with reference to FIGS. 2, 6, and 7. FIG. Note that the same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted. The differences from the first embodiment are the structure of the lock claw 42 and the lock claw 42
It is a fixed structure. First, FIG.
This will be described with reference to FIG. As in the first embodiment, a ring-shaped flat plate made of metal (phosphor bronze, etc.) is used for the lock claw 42,
By alternately providing a large number of radial cuts from each of the inner peripheral edge and the outer peripheral edge, an elastic locking piece 114 formed in a zigzag outer shape and extending toward the center is formed. The difference from the lock claw 42 of the first embodiment is
An outer peripheral edge portion connecting the elastic locking pieces 114 is bent in the same direction to form a cylindrical shape. The reduced diameter portion 44 in consideration of the thickness of the lock claw 42 is provided at the right end of the joint main body so that the cylindrical outer peripheral edge portion of the lock claw 42 can be mounted on the outer peripheral surface at the right end of the joint main body 12. Is formed.

Next, a structure for fixing the lock claw 42 to the joint body 12 will be described with reference to FIG. Joint body 12
A lock claw 42 which is bent and formed into a cylindrical shape
Of the joint body 1 in this state.
2 is pressed into the guide cylinder 18. As a result, the outer peripheral edge portion (bent portion) is sandwiched between the outer peripheral surface on the right end side of the joint body 12 and the inner peripheral surface of the guide cylinder 18.

According to the above configuration, the lock claw 42
Since the outer peripheral edge portion connecting the elastic locking pieces 114 is bent in a cylindrical shape, when attaching the lock claw 42,
It is only necessary to cover the outer peripheral surface on the right end side of the joint main body 12 with a tubular portion, and there is no need for positioning. Further, similarly to the first embodiment, since the outer peripheral edge portion of the lock claw 42 is sandwiched,
The tip of the elastic locking piece 114 is deformed with the vicinity of the base of the bent portion as a fulcrum, and the strength of the elastic locking piece 114 itself is increased, so that the biting into the tube 38 can be performed reliably. As described above, various preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments.
For example, it is needless to say that the lock claw does not have to be bent at the outer peripheral edge thereof, and it is needless to say that many more modifications can be made without departing from the spirit of the invention.

[0020]

When the pipe joint according to the present invention is used, since the guide cylinder and the open cylinder are formed by drawing, they can be manufactured in a shorter time than conventional cutting, and the manufacturing cost can be reduced. Reduction is possible. Further, since the crimping work is not required, the production time can be further reduced. In addition, an open cylinder
The outer peripheral surface of the insertion end has a predetermined length in the axial direction.
A plurality of engaging holes are formed along the circumferential direction, and
Is extended inward, engages with the engagement hole, and
The engagement projection that regulates the movement of the
Because it is formed, the insertion of the open cylinder into the guide cylinder is also possible
It can be easily done and the open cylinder comes off the guide cylinder.
It also has a significant effect that it can be prevented .

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a first embodiment of a pipe joint according to the present invention.

FIG. 2 is a side sectional view showing a second embodiment of the pipe joint according to the present invention.

FIG. 3 is an exploded perspective view of the pipe joint of FIG. 1 with a part cut away.

FIG. 4 is a front view of the lock claw of FIG. 1;

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a front view of the lock claw of FIG. 2;

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a side sectional view showing an example of a conventional pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Joint main body 18 Guide cylinder 26 Open cylinder 112 Lock claw 114 Elastic locking piece

Claims (5)

(57) [Claims] 1. A tubular joint body, a guide cylinder one end of which can be connected to one end of the joint main body, and a plurality of pipes disposed in the guide cylinder and extending inward of the guide cylinder. A ring-shaped lock claw having an elastic locking piece, and slidably inserted along the axial direction on the inner peripheral surface on the other end side of the guide cylinder, and the elastic locking piece is inserted at the insertion end. In a pipe joint comprising a pushable open cylinder, the guide cylinder and the open cylinder are formed by drawing using a metal material, and an outer peripheral surface of the insertion end of the open cylinder. In the axial direction
A plurality of engagement holes having a predetermined length are formed along the circumferential direction.
The guide cylinder is extended inward to
Engages with the hole and restricts the movement of the open cylinder in the axial direction to a predetermined value.
A pipe joint, wherein an engagement projection for regulating the distance is formed . 2. The engaging projection is provided at one end of the guide cylinder.
Notch tongue with its side tip bent inside the guide cylinder
Pipe joint according to claim 1, characterized in that. 3. The guide cylinder connected to the joint body.
One end side is enlarged to fit with the outer peripheral surface on one end side of the joint body.
The outer peripheral edge of the lock claw is formed on one end face of the joint body.
Fits and retains in an annular groove formed between the inner end surface of the enlarged diameter portion
Claim 1 or 2 pipe joint, wherein the being. 4. The lock claw has an inner peripheral edge and an outer peripheral edge.
Numerous radial cuts alternate from each edge
And the elastic locking piece is formed.
Is bent in the insertion direction of the open cylindrical body over a certain width.
The pipe joint according to claim 1, 2 or 3, wherein: 5. The guide cylinder connected to the joint body.
One end is expanded in order to mate with one end side outer peripheral surface of the joint the body
The outer peripheral edge side of the lock claw is formed over the fixed main body over a predetermined width.
The outer peripheral surface of one end of the body is bent so as to be mounted on the outer peripheral surface of the joint body.
2. The battery according to claim 1, wherein the support is sandwiched between the outer peripheral surface and the outer peripheral surface.
Or the pipe joint according to 2 .