JP2775512B2 - Pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The invention of this application relates to a pipe joint for connecting pipes.

(Prior art)

Conventional pipe joints include, for example, those shown in FIG.

As shown in the figure, an advancing / retracting thin tube (2) is slidably mounted coaxially with a cylindrical main body (1) having a male thread portion at one end, as shown in FIG. The holding cylinder (3) is interposed between the thin tube (2) and the main body (1) so as to be able to move forward and backward, and the holding tube (3) is sandwiched between the thin tube (2) and the holding tube (3). The pipes inserted between them are fixed in a state where they cannot be removed.

For this reason, as shown in the figure, the main body (1) has one end as a pipe insertion port, and forms a tapered portion on the inner peripheral portion near the pipe insertion port that decreases in diameter toward the open side. is there.

The holding cylinder (3) is made of an elastic material. As shown in the figure, the outer diameter of the holding cylinder (3) is set to be slightly larger than that of the pipe insertion port, and the outer wall is formed on the peripheral wall toward the pipe insertion port side. An opening slit is formed.

The gap between the holding cylinder (3) and the reciprocating narrow cylinder (2) is set to be slightly smaller than the wall thickness of the pipe connected thereto.

Therefore, when the pipe is forcibly inserted between the holding cylinder (3) and the reciprocating thin tube (2) through the pipe insertion port, and then the pipe is pulled, the holding tube (3) and the reciprocating thin tube (2) are pulled. ) Will move integrally with the pipe to the pipe insertion port side.
Then, from the time when the holding cylinder (3) comes into contact with the tapered portion of the main body (1), the pressing force from the tapered portion acts on the holding cylinder (3) in a direction in which the diameter is reduced. The holding force on the pipe by the holding cylinder (3) and the advance / retreat thin cylinder (2) increases, and the pipe is connected in a retaining state.

That is, in this pipe joint, pipes can be easily connected simply by inserting pipes from the pipe insertion port and then pulling the pipes forward, which is very convenient.

However, the pipe joint of the above type has a problem that once connected, the connected pipe cannot be removed.

[Problems to be solved by the invention]

In view of the above, an object of the invention of the present application is to make it possible to easily remove not only a pipe but also a pipe in the above-mentioned type of pipe joint.

[Means for solving the problem]

In the invention described in claim 1 of this application, the pipe joint is configured as follows. That is, it is formed in a cylindrical shape with both ends open, with a part of the inner peripheral surface being a large diameter portion (13), and a plurality of through holes (1
And a plurality of spheres (4) housed and held in the through-hole (14) such that the top (40) can protrude and retract from the outer peripheral surface of the main body (1). The body (1) is fitted to one end of the main body (1) so as to be able to advance and retreat, and
The top (4) of the sphere (4) protruding from the outer peripheral surface of the main body (1)
0) and a cylindrical body (5) having a concave portion (50) in an engaged state.
And slidably inserted into one end of the main body (1), and
Main body (1) with the top (40) of the sphere (4) by the outer peripheral surface
Advancing / retracting thin cylinder (2) that keeps protruding from the outer peripheral surface of the cylinder
And housed in the large-diameter portion (13) so as to be able to advance and retreat, and
An annular pressing body (6) biased by a spring to press the advance / retreat thin tube (2); and a holding tube interposed between the advance / retreat thin tube (2) and the tube (5) so as to be able to advance and retreat. (3), the inner peripheral portion of the cylindrical body (5) near the open end is provided with a tapered portion (51) whose diameter is reduced toward the open end, and the open portion is connected to a pipe insertion port (52). The outer diameter of the holding cylinder (3) is set slightly larger than the minimum diameter of the tapered portion (51), and the holding cylinder (3) is connected to the pipe insertion port (52) side of the cylindrical body (5). Forming a slit (30) that opens toward the front, and setting a gap between the advance / retreat thin tube (2) and the holding tube (3) to be slightly smaller than the wall thickness of a pipe inserted therein; When (2) is pushed in a certain range against the urging force on the pressing body (6), the top (40) of the sphere (4)
Recess (20) into which the body falls below the outer peripheral surface of the main body (1)
Is formed on the outer peripheral surface of the advance / retreat thin tube (2).

Further, in the invention described in claim 2 of the present application, in the invention described in claim 1, the pressing body (6) and the advance / retreat thin tube (2) are integrally formed.

[Action]

 The invention of this application works as follows.

(Operation of the Invention of Claim 1) When connecting pipes using this pipe joint, the procedure may be substantially the same as that described in the section of the prior art. That is,
The holding cylinder (3) is inserted through the pipe insertion port (52) of the cylinder (5).
And forcibly insert the pipe between the advance and retraction tube (2),
If you pull the pipe, it can be easily connected.

Also, when removing the pipe from this fitting, first,
Push the connected pipes to a certain extent. Then, a sphere (4) is formed in the recess (20) formed on the outer peripheral surface of the advance / retreat thin tube (2)
When the cylindrical body (5) is pulled in this state, the sphere (4) falls into the concave portion (20), and sinks below the outer peripheral surface of the main body (1). That is, the engagement between the cylinder (5) and the main body (1) via the sphere (4) is released, and the cylinder (5) can be removed from the main body (1).

When a tensile force is applied to the pipe in a state where the tubular body (5) is removed as described above, the pipe can be separated from the main body (1) integrally with the advance / retreat thin tube (2) and the holding tube (3). Becomes

Thereafter, for example, when a tensile force is applied to the pipe in a state where the holding cylinder (3) and the advance / retreat tube (2) are supported, the pipe can be removed from the advance / retreat tube (2) and the holding tube (3). .

(Operation of the invention according to claim 2) Although it has substantially the same operation as that of the invention according to claim 1,
In this device, since the pressing body (6) and the advance / retreat thin tube (2) are integrally formed, the integrated component of the advance / retreat thin tube (2) and the pressing body (6) is mainly composed of the main body (1). On the other hand, it is attached in a retaining state.

Therefore, when the pipe is pulled after the cylinder (5) is removed from the main body (1), the pipe can be removed from the advance / retreat thin tube (2) and the holding tube (3).

〔Example〕

Hereinafter, the configuration of the present invention will be described with reference to the drawings shown as embodiments.

As shown in FIG. 1, this pipe joint includes a main body (1),
It is composed of an advancing / retreating tube (2), a holding tube (3), a sphere (4), a tube (5), and a pressing body (6).

(Explanation of the main body (1) and the sphere (4)) As shown in FIG. 1, the main body (1) has a male screw portion (15).
The nipple (1a) having the shape and the socket (1b) are screwed together, and a large-diameter portion (13) is formed on a part of the inner peripheral surface. The socket (1
A plurality of through holes (14) are drilled at regular intervals near one end of b), and each through hole (14) accommodates a sphere (4). Then, as shown in the figure, the opening on the inner peripheral surface side of the through hole (14) is set slightly smaller than the diameter of the sphere (4), and the inner peripheral surface side of the through hole (14) is formed on the inner peripheral surface side. The sphere (4) is formed with a through-hole (1).
The top part (40) can be protruded and retracted from the outer peripheral surface of the main body (1b) without falling out of 4).

That is, in this case, an inwardly protruding portion serving as an opening on the inner peripheral surface side of the through hole (14), and an inwardly protruding flange (12)
Correspond to the inwardly protruding portions (11) described in the section of the means.

(Description of cylindrical body (5)) As shown in FIG. 1, the cylindrical body (5) is externally fitted to one end of the main body (1) so as to be able to advance and retreat, and a concave portion corresponding to the above-mentioned spherical body (4). (50) is provided. And the subject (1)
When the top (40) of the sphere (4) protrudes from the outer peripheral surface of the sphere (4), the sphere (4) engages with the recess (50) to form the main body (1).
When the sphere (4) is immersed below the outer peripheral surface of the main body (1), the engagement between the sphere (4) and the concave portion (50) is released. ) To cylindrical body (5)
Can be separated.

The cylindrical body (5) is provided with a tapered portion (51) whose diameter decreases toward the open side, and the open end of the cylindrical body (5) is connected to a pipe (see FIG. 3). H) is a pipe insertion port (52) for connection.

(Description of advance / retreat thin tube (2)) The advance / retreat thin tube (2) is slidably inserted into one end of the main body (1) as shown in FIG. (52) It is located near.

A sliding portion (21) for maintaining the sphere (4) in a state of protruding from the outer peripheral surface of the main body (1) by an outer peripheral surface as shown in the same figure, A circumferential groove into which the sphere (4) falls so as to be immersed below the outer peripheral surface of the main body (1) when the advance / retreat thin tube (2) is pushed in a certain range against the urging force on the pressing body (6). (22) is provided.

(Description of Pressing Body (6)) As shown in FIG. 1, the pressing body (6) includes a cylindrical portion (60) and an annular flange portion (61) provided at one end thereof. The diameter of the flange (61) is set slightly smaller than that of the large diameter portion (13). And this pressing body (6)
As shown in the figure, the coil spring (62) is urged toward the pipe insertion port (52) so as to fit the coil spring (62) on the cylindrical body (60).

(Description of Holding Tube (3)) The holding tube (3) is made of an elastic synthetic resin, and as shown in FIG. 1, its outer diameter is set to be slightly larger than the pipe insertion port (52). At the same time, a tapered portion (31) corresponding to the tapered portion (51) is formed on the outer peripheral portion on the side of the pipe insertion port (52), and as shown in FIG. A plurality of locking claws (32) are provided around. And, on the outer peripheral wall of the holding cylinder (3), a slit (30) opening to the pipe insertion port (52) side and a slit (33) opening to the other end side are alternately provided.

In this case, in the state where the above-mentioned advance / retreat thin tube (2) and holding tube (3) are accommodated in a cylindrical body (5) as shown in FIG. 3) is made slightly smaller than the wall thickness of the pipe (H) shown in FIG. 2 inserted therein.

(Other Description) As shown in FIG. 1, the main body (1) has a groove (17) on the inner peripheral surface between the large-diameter portion (13) and the through hole (14).
And an O-ring is mounted in the groove (17) so that airtightness between the advance / retreat thin tube (2) and the main body (1) is ensured. In addition, the advance / retreat thin cylinder (2)
A groove (23) is provided on the outer peripheral surface near the tip and an O-ring is mounted in the groove (23). As shown in FIG. 2) and holding cylinder (3)
In this state, airtightness between the inner peripheral surface of the pipe (H) and the outer peripheral surface of the advance / retreat thin tube (2) is ensured.

Since this pipe joint is configured as described above, as shown in FIG. 2, the pipe (H) is connected to the reciprocating narrow pipe (2) through the pipe insertion port (52) of the cylindrical body (5). When forcibly inserted between the holding cylinders (3), a clamping force is applied to the pipe (H) by the holding cylinder (3) and the reciprocating narrow cylinder (2) due to the elastic return force from the holding cylinder (3). Becomes In this state, when the pipe (H) is pulled, the pipe (H) is engaged with the locking claw (32) of the holding cylinder (3) and the reciprocating thin cylinder (2) by the described operation.
The outer peripheral wall of the third
As shown in the figure, the locking claws (32) bite into the outer peripheral surface of the pipe. Therefore, once connected, the pipe (H) does not accidentally come off.

Also, when removing the pipe (H) from this fitting,
First, the connected pipe (H) is pushed in a certain range against the urging force of the coil spring (62). Then, the advancing / retreating thin tube (2) and the holding tube (3) holding the pipe (H) are in the fifth position.
As shown in the figure, the spheres (4) are pushed together, so that all the spheres (4) can be dropped into the circumferential groove (22) formed on the outer peripheral surface of the advance / retreat thin tube (2). Next, when the cylindrical body (5) is pulled, as shown in FIG. 6, the spherical body (4) becomes the circumferential groove (22).
And falls under the outer peripheral surface of the main body (1). That is, the engagement between the cylinder (5) and the main body (1) via the sphere (4) is released, and the cylinder (5) can be removed from the main body (1).

When a tensile force is applied to the pipe (H) in the state where the tubular body (5) is removed as described above, as shown in FIG. It can be separated from the subject (1) integrally with 3).

Thereafter, for example, when a tensile force is applied to the pipe while supporting the holding cylinder (3) and the reciprocating thin cylinder (2), the pipe (H)
Can be removed from the advance / retreat tube (2) and the holding tube (3).

That is, in the pipe joint having the above configuration, the pipe (H) can be easily attached and detached.

In the pipe joint of the above embodiment, the pressing body (6) and the reciprocating narrow cylinder (2) are separate bodies, but the pressing body (6) is integrated with the reciprocating narrow cylinder (2) (hereinafter, referred to as the following). , A retractable thin tube (referred to as 2a)). In this case, as shown in FIGS. 8 and 9, the pipe (H) is pulled after the cylinder (5) is removed from the main body (1) in substantially the same manner as in the above embodiment, and FIG. As shown in (1), the advance / retreat thin cylinder (2a) remains on the main body (1) side.

In the above state, there is no pressing force from the main body (1) acting on the holding cylinder (3). Therefore, the holding force of the holding cylinder (3) and the advance / retreat thin cylinder (2a) on the pipe is eliminated. Becomes small corresponding to the elastic return force of the holding cylinder (3). As a result, when a tensile force is applied to the pipe, the pipe can be removed from the advance / retreat thin cylinder (2a) and the holding cylinder (3).

Further, in all of the above embodiments, the nipple (1a) has the male screw part (15) for connecting the pipe on the outer peripheral part. However, the present invention is not limited to this. It may have a part. Further, the same pipe connection structure may be adopted for both ends.

〔The invention's effect〕

Since the inventions described in claims 1 and 2 of this application have the above-described configuration, both have the following effects.

Because of the above-described effects, it is possible to provide a pipe joint that can be easily removed as well as connected to the pipe.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a pipe joint according to the invention of this application, and FIGS. 2 and 3 are explanatory views of a method of connecting pipes by the pipe joint. FIG. 4 is a half sectional view of the method used for the pipe joint. FIG. 5 to FIG. 7 are explanatory views of a method of removing a pipe connected to the pipe joint. 8 to 10 are explanatory views of another embodiment, and are explanatory views of a method for removing a pipe connected to the pipe joint. FIG. 11 is a half sectional view of a conventional pipe joint. In the figure, (1): main body, (2): advancing / retracting narrow cylinder (3): holding cylinder, (4): spherical body (5): cylindrical body, (6) Pressing body (10) Pipe inlet, (11) Inwardly protruding piece (13) Large diameter section, (14) Through hole (15) Male thread, (16) Female thread Part (20) ... groove, (30) ... slit (31) ... taper part, (40) ... top part (50) ... concave part, (51) ... taper part

Claims (8)

(57) [Claims] A main body (1) which is formed in a cylindrical shape having both ends open at both ends with a part of an inner peripheral surface having a large diameter portion (13), and having a plurality of through holes (14) near one end thereof. A plurality of spheres (4) housed and held in the through-hole (14) such that the top (40) can protrude and retract from the outer peripheral surface of the main body (1); The top part (40) of a sphere (4) which is fitted so as to be able to advance and retreat and protrudes from the outer peripheral surface of the main body (1)
A cylindrical body (5) having a concave portion (50) that is engaged with the cylindrical body (5); a top (40) of the spherical body (4) slidably inserted into one end of the main body (1) and having an outer peripheral surface; A retractable thin tube (2) for maintaining the protruding portion from the outer peripheral surface of the main body (1), and a retractable thin tube (2) housed in the large-diameter portion (13) so as to be able to advance and retreat. An annular pressing body (6) biased by a spring; and a holding cylinder (3) interposed between the advancing and retreating thin cylinder (2) and the cylinder (5) so as to be able to advance and retreat. The inner peripheral portion near the open end in (5) is provided with a tapered portion (51) that decreases in diameter toward the open end, and the open portion is used as a pipe insertion port (52), and the outer diameter of the holding cylinder (3) is reduced. Is set slightly larger than the minimum diameter portion of the tapered portion (51), and the holding tube (3) is opened toward the pipe insertion port (52) side of the cylindrical body (5). A gap between the advance / retreat thin tube (2) and the holding tube (3) is set to be slightly smaller than the thickness of a pipe inserted into the slit (30). A concave portion (20) into which the top portion (40) of the sphere (4) falls so as to be immersed below the outer peripheral surface of the main body (1) when is pressed in a certain range against the urging force on the pressing body (6).
Is formed on the outer peripheral surface of the advance / retreat thin tube (2). 2. The pipe joint according to claim 1, wherein the pressing body (6) and the advance / retreat thin tube (2) are integrally formed. 3. A tapered portion (51) is formed on an outer peripheral portion of the holding cylinder (3).
The pipe joint according to claim 1, further comprising a tapered portion (31) corresponding to (b). 4. The pipe joint according to claim 1, wherein said holding cylinder is made of an elastic synthetic resin. 5. An inward projection (11) is provided on the outer surface and the inner surface of the main body (1), and the spherical body (4) is formed by the inward projection (11).
The pipe joint according to any one of claims 1 to 4, wherein the pipe joint is held in a retaining state. 6. The pipe joint according to claim 1, wherein a male thread portion (15) for connecting a pipe is formed on the outer peripheral surface on the other end side of the main body (1). 7. The pipe joint according to claim 1, wherein a female screw portion for connecting a pipe is formed on the inner peripheral surface on the other end side of the main body (1). 8. The pipe joint according to claim 1, wherein the recess (20) is a circumferential groove (22).