JPS6329989Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to improvement of pipe joints.

Conventionally, pipe fittings have been used to connect pipes mainly made of nylon or soft metals, and have been used to remove pipes by locking an edge or the like on the outer surface of the pipe inserted through the pipe insertion port in the joint body equipped with a fluid passage. Various types (e.g., collet type, disc spring type, inclined edge ring type, eccentric ring type, etc.) are equipped with a locking means that prevents the tube from coming off and a release operation means that releases the lock and allows the tube to be removed. A one-touch pipe fitting has been proposed and put into practical use. In such one-touch pipe fittings, the pipe is held by biting an edge from the outside of the pipe, and a packing such as an O-ring is brought in close contact with the outer surface of the pipe to seal it. Furthermore, when inserting and connecting tubes made of softer materials (urethane, polyethylene vinyl, etc.), if the edges try to bite in from the outside, the tubes will deform inward and escape, so the edges will not bite in enough. The disadvantage is that the tube can fall out.

The present invention has been developed in view of the above, and includes a reinforcing tube that fits into the pipes to be connected and prevents them from deforming inwardly. The feature is that this makes it possible to connect soft pipes.

In addition, the present invention makes it easier to insert and remove the reinforcing tube by making the outer diameter of the reinforcing tube slightly smaller than the inner diameter of the tube to be inserted and connected. The flange is shaped so that the O-ring can be easily inserted into a general one-touch fitting by pushing it open from the pipe insertion port side, but once inserted, the flange will lock onto the O-ring. It is characterized in that it is constructed so that it does not slip out, thereby making it easy to insert and attach the reinforcing pipe to the joint body.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIG. 1, 1 indicates a pipe joint, and 2 indicates a pipe made of a soft material.
A one-touch type tube connecting portion 4 is provided on the tube insertion port 1b side of the joint body 1a provided with the fluid passage 3. As this connecting part, there are various known types that are equipped with a locking means that locks on the outer surface of the tube to prevent it from coming off, and a release operation means that releases the lock and allows the tube to be pulled out. The drawing shows an example. That is,
In the illustrated embodiment of the pipe connecting portion 4, a sleeve 5 having a tapered surface 5a at the inner end is installed inside the joint body 1a, and a clamp ring 6 whose outer periphery is in sliding contact with the tapered surface 5a is installed along the tapered surface 5a. The clamp ring 6 is disposed so as to be displaceable in a direction in which the ring axis is shifted from the axis of the joint body.
An insertion hole 6a having a tapered shape opposite to the tapered surface 5a is eccentrically bored, and a sharp edge 6b is formed at the edge of the hole to engage the outer periphery of the tube 2. A spring 7 is disposed behind the tube to bias it toward the tube insertion port 1b. As shown in FIG. 3, the spring 7 has a plurality of spring pieces 7b cut and raised in the circumferential direction on an annular spring base plate 7a.

Further, the clamp ring 6 is provided on the pipe insertion port 1b side of the clamp ring 6 in the sleeve 5.
A slidable cylindrical release ring 8 for pressing from the outside is inserted and fitted concentrically with the joint body 1a with its outer end protruding from the joint body 1a,
In order to prevent the release ring 8 from coming off, the stepped portion 8a of the release ring 8 is engaged with the stepped portion 5b of the sleeve 5.

Further, in the joint body 1a, an O-ring 9 is disposed inside the tube connecting portion 4 to seal the fluid in close contact with the outer peripheral surface of the tube 2, and a reinforcing tube 10 is provided with a flange 10a at the tip. is installed concentrically with tube 2. The reinforcing tube 10 has an outer diameter slightly smaller than the inner diameter of the tube 2 and is formed to such an extent that it can be easily inserted and removed from the tube end, and the outer diameter of the flange 10a is such that it can be released from the tube insertion port side. The reinforcing tube 10 is formed so that it can be inserted through the ring 8 and the clamp ring 6, and at the same time can be inserted by pushing the O-ring 9 open. Stepped portion 3a inside main body 1a
If it is inserted into the joint body 1a so as to be positioned between the two, it will not come out unless it is pulled out by some means.

Note that 11 in the figure is a retainer.

When connecting pipes 2 made of a soft material using the pipe fitting 1 having the above-described configuration, when the pipe 2 is inserted into the pipe connecting portion 4 of the fitting body 1a from the insertion port 1b, the pipe 2 is inserted into the periphery of the insertion hole 6a. The clamp ring 6 is displaced along the tapered surface 5a due to the abutment of the tube 2, and the insertion hole 6a becomes concentric with the tube 2, so that the tube 2 is fitted into the reinforcing tube 10 when the first
The flange 1 of the reinforcing tube 10 is pushed in to the position shown in the figure.
It stops until the position where 0a contacts the stepped portion 3a. When the pushing is completed, the clamp ring 6 is biased by the spring 7 and is displaced along the tapered surface 5a to return to the initial position, so that the sharp edge 6b bites into the side surface of the tube 2 and locks. The tube 2 is connected and fixed. In this case, the tube 2 made of soft material
Since the reinforcing tube 10 is fitted therein, the reinforcing tube 10 is not deformed inwardly, so that the sharp edge 6b reliably bites into and locks against the outer surface of the tube 2.

When a force in the pulling direction is applied to the tube 2,
The displacement of the clamp ring 6 is promoted, the sharp edge 6b bites deeper, and the resistance to pulling out increases, so that the tube does not come out.

When pulling out tube 2, as shown in Figure 2,
When the clamp ring 6 is pressed by pushing the release ring 8, the ring 6 moves toward the back and becomes in a state where it can be freely displaced according to the gap between it and the tapered surface 5a, thereby eliminating the sharp edge. Since the biting of the tube 6b is eliminated, the tube 2 can be freely pulled out. In this case, since the outer diameter of the reinforcing tube 10 is formed to be slightly smaller than the inner diameter of the tube 2, the tube 2 can be pulled out without resistance, and the flange 10a of the reinforcing tube 10 is attached to the O-ring 9.
There is no way to push it open and get out.

Moreover, the above-mentioned pipe joint can be easily constructed by simply inserting a reinforcing pipe into an existing one-touch type pipe joint of the same standard. In other words, in this type of one-touch type pipe fitting, it is not necessarily necessary to use the above-mentioned reinforcing pipe when connecting nylon or metal pipes, but it is not necessary to use the reinforcing pipe described above when connecting pipes made of nylon or metal. When connecting soft tubes, it becomes necessary to use the reinforcing tube. In this case,
All you have to do is fit the reinforcing pipe into the tip of the pipe to be connected, and then insert it into the existing pipe joint. By doing this, the reinforcing pipe can be inserted into the joint body without slipping out, and the soft A fitting can be constructed for the pipe.

It should be noted that the reinforcing pipe 10 does not necessarily have to extend to the inside of the biting position of the sharp edge 6b in the pipe 2, and it has been experimentally shown that even if the reinforcing pipe 10 is shorter than that, deformation of the pipe 2 can be sufficiently suppressed. It's confirmed.

As detailed above, according to the pipe joint of the present invention, a reinforcing pipe is provided in the pipe connecting portion to fit into the inserted pipe and prevent it from deforming inwardly.
When connecting soft pipes, a locking means such as a sharp edge can be securely locked to the outer surface of the pipe,
In addition, the outer diameter of the reinforcing tube is made slightly smaller than the inner diameter of the tube so that it can be fitted loosely into the tube, making it easy to attach and detach the tube with little resistance. The diameter is made slightly larger than the inner diameter of the O-ring, and by pushing the O-ring open with the flange, it can be inserted into and removed from the joint body.
When the pipe is pulled out or in the state of being pulled out, the flange locks with the O-ring and the reinforcing pipe does not unnecessarily come out of the joint body. Since it can be easily inserted into and removed from type pipe joints, it can also be used as a joint for hard pipes and soft pipes.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a state in which tubes made of soft material are connected in an embodiment of the present invention, FIG. 2 is a cross-sectional view of the tube being pulled out, and FIG. 3 is a front view of the spring. 1...Pipe joint, 1a...Joint body, 2...Pipe,
3... Fluid passage, 4... Pipe connection portion, 9... O-ring, 10... Reinforcement tube, 10a... Collar portion.

Claims (1)

[Scope of utility model registration request] A coupling body provided with a fluid passage has a locking means that locks on the outer surface of a pipe inserted into the joint body to prevent the pipe from being pulled out, and a release operation means that releases the lock to enable the pipe to be pulled out. , which is provided with a one-touch type pipe connection part equipped with an O-ring that seals fluid in close contact with the outer surface of the pipe, and the soft pipe is inserted into the joint body and inserted into the soft pipe. A reinforcing tube is installed to prevent inward deformation of the
By forming the reinforcing tube to have a slightly smaller diameter than the inner diameter of the soft tube, it is possible to loosely fit the reinforcing tube into the soft tube, and the O-ring can be pushed open and inserted from the tube insertion port side of the joint body. 1. A pipe joint characterized in that it can be freely inserted into and removed from a joint body by providing a flange portion having an outer diameter slightly larger than the inner diameter of the O-ring.