JPH01299396A - Tube fitting using collet - Google Patents

Abstract

PURPOSE:To simply connect and remove a tube with a small force by inserting the movable piece of a collet to the inside of a collar when the collar is moved forward, internally bending in a tapered face and engaging the external face of the tube. CONSTITUTION:When a collar 9 is placed at a back end position, it does not press the movable piece 11 of a collet 8 to the inside thereof, so that a tube 18 can be freely inserted into the collet 8. After the tube 18 is inserted, when the collar 9 is moved forward with respect to the collet 8, the movable piece 11 of the collet 8 enters to the inside of the collar 9, is considerably pressed internally on a tapered face 17 and largely bent to the inside. Thus, an engaging edge 12 formed on the internal side face of the respective movable pieces 11 is caused to bite on the external face of the tube 18 and the tube 18 can be strongly engaged and fixed. When the tube is pulled out, the collar 9 is held at the back end position and the tube 18 is temporarily pressed forward, the collet 8 is moved forward and the engagement of the engaging edge 12 is released, and then, the tube 18 can be pulled out by pulling the tube backward.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pipe joint used for piping fluids such as gases and liquids, and more specifically, a pipe joint for removably connecting a pipe to a joint body using a collet. The present invention relates to a pipe joint made as described above.

[Conventional technology]

2. Description of the Related Art Pipe joints using a collet in which a plurality of slits are provided at one end of a cylindrical member so that the diameter of the slits can be expanded or contracted are conventionally known.

For example, in Japanese Utility Model Publication No. 61-24987, a tube is inserted into a collet fitted inside a joint body, the movable pieces of the collet are spread apart by the sound itself, and the tube is moved by its elastic force (restoring force). A locking pipe fitting is disclosed.

[Problem to be solved by the invention]

However, with the above-mentioned pipe joint, when pulling out the pipe, it is necessary to pull the pipe with strong force to overcome the elastic force of the collet, making it difficult to remove the pipe, and at this time, it is necessary to pull the pipe with strong force to overcome the elastic force of the collet. The problem was that the edges often caused damage to the outer surface of the tube.

In addition, since the pipe is locked only by the elastic force of the movable piece of the collet, it is necessary to make the collet out of metal and make its digging edges sharp and hard, which makes machining the collet relatively difficult. Not only that, but manufacturing costs had to rise as well.

This invention has been made to solve the above-mentioned problems of the conventional pipe joints.The purpose of this invention is to make it possible to connect and disconnect pipes with small force and very easily. To provide a pipe joint that has a large force for locking a pipe and makes it difficult to remove the pipe.

Another object of the invention is to provide a pipe fitting that is easy to manufacture and inexpensive to manufacture, with little risk of damaging the outer surface of the pipe during removal.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a joint body (1) provided with a pipe connection part (4) at the rear part, and a joint body (1) provided with a pipe connection part (4) at the rear part.
), a collet (8) is provided inside the collet (8) so as to be movable back and forth with the movable part (8a) facing backward; A collar (9) having a rearwardly inclined tapered surface with zero force is provided on the inner surface.

The collar (9) is connected to the collet (8) at the rear end position.
The movable piece (11) of the collet (8) is not pressed inward, and when the collar (9) is moved forward relative to the collet (8), the movable piece (11) of the collet (8) enters inside the collar (9), and
The tapered surface Q7) bends greatly inward, causing the tube to 0ω
is configured to lock the outer surface of the

The outer surface of the rear end of each movable piece QD of the collet (8) is chamfered or rounded to have a substantially arcuate cross section.
It is possible to make it easier for 0 to enter inside the collar (9). For the same purpose, the inside of the front end of the collar (9) may also be chamfered or rounded6.
When chamfering, the angle of the tapered surface (9a) with respect to its central axis is 45 to 20 for the collet (8).
°, and the collar (9) is preferably 20-5''.

A straight (cylindrical) surface (9b) having an inner diameter slightly smaller than the outer diameter of the movable part of the collet (8) can be provided on the inner surface of the collar (9) in front of the tapered surface. . In this way, the straight side will become the collet (8).
When the movable piece OD is in contact with the movable piece 00, the movable piece θD is slightly bent inward, and the tapered surface 07) is brought into contact with the movable piece OD, thereby making it possible to bend the movable piece OD more strongly.

[Function] When the collar (9) is at the rear end position, the collet (8)
Since the movable piece (11) of is not pressed inward, the tube αυ can be freely inserted into the collet (8). After inserting the tube 08), the collar (9) is inserted into the collet (8).
), the collet (8)
The movable piece OD enters inside the collar (9), and
Since it is strongly pressed inward by the tapered surface, it is largely deflected inward. In this way, the locking edge Oz formed on the inner surface of each movable piece 01) bites into the outer surface of the pipe 0il), and the pipe 0υ is strongly (locked and fixed).

When pulling out the tube, while holding the collar (9) at the rear end position, push the tube forward once and remove the collet (8).
Move it forward to release the locking edge surface.

In this state, if you pull the tube (1 m) backward, you can pull out the tube OF.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In the following description, the left side of the pipe joint according to the present invention shown in each figure will be referred to as the front, and the right side will be referred to as the rear.

In Figure 1, (1) is the joint body, and the front part of the hexagonal central part (2) that sometimes locks a spanner etc. is the attachment part (3) to equipment, etc., and the rear part is the pipe connection part (3). 4), a threaded portion (5) is formed on the outside of the attachment portion (3), and a through hole (6) is provided inside. In addition, the pipe connection part (4)
A chamber (7) is provided inside the chamber (7) in communication with the through hole (6). A generally cylindrical collet (8) is fitted in the front of this chamber (7) and is movable back and forth along the side wall of the chamber (2). A collar (9) having a similar shape is attached to the rear of the collet (8) so that the collar (9) can be moved back and forth by inserting its front end into the chamber ω.

As shown most clearly in FIG. 5, the collet (8) is provided with a movable part (8a) at the rear that can expand and contract its diameter. This movable part (8a) consists of a plurality of movable pieces OD divided by a plurality of slits 01) formed along the central axis direction, and a locking piece is provided inside the rear end of each movable piece (11). An edge surface is formed. The outside of the rear end of each movable piece (11) has a tapered surface (8b) that slopes toward the rear in order to facilitate insertion of the collar (9). Preferably, the angle is between 45° and 20° with respect to its central axis. In addition, in the state shown in FIG. 1, the collet (8) is positioned with its front end in contact with the collet holder in chamber a) part 031, and therefore cannot move forward. (9) is approximately cylindrical, and an annular projection side is formed on the outside of its front end, and this annular projection 04
This prevents the collar (9) from coming off. Color(
9) A flange 0ω is provided at the rear end to make it easier to push the collar (9) forward. In the chamber (7), the diameter of the part where the collar (9) is inserted is slightly larger than the diameter of the part where the collet (8) is fitted.
The front end portion of the collar (9) is fitted therein so as to move back and forth on the outside of the movable portion of the collet (8).

In this embodiment, the inside of the front end of the collar (9) is arranged rearward so that the movable piece 01) of the collet (8) can easily enter the collar (9) when the collar (9) is pressed forward. The tapered surface (9a) is inclined, and the first
The rear end position of the collar (9) shown in the figure, that is, the rear end position of the collar (9)
At the position where the annular projection (b) of ) contacts the inner projection aQ of the rear end opening of the joint body (1), the tapered surface (9a) of the front end of the collar (9) touches the movable piece of the collet (8). (11)
It is in contact with the outside of the rear end.

The inner surface of the collar (9) is further provided with the tapered surface (9).
A straight surface (cylindrical surface) (9b) is provided following the straight surface (9b), and a rearwardly inclined tapered surface a force is formed to tighten the collet (8) more strongly. ing. The inner diameter of the straight surface (9b) is made slightly smaller than the outer diameter of the movable part (8a) of the collet (8), so that the straight face (9b) lightly presses the movable part (8a). Color (9
) The inclination angles of the tapered surfaces (9a) 07) are preferably 20° to 5° with respect to the central axis.

Note that OF is a pipe connected to the joint body (1), which passes through the inside of the collar (9) and collet (8) to the joint body (
It can be inserted into the through hole (6) of 1) until it comes into contact with the pipe stopper part 09 of the attachment part (3). Center(
2), an annular groove is provided in the peripheral wall of the through hole (6), and an O for sealing the pipe O1 is provided in this annular groove.
Ring Q. is fitted.

Next, the usage condition of the pipe joint configured as above will be explained.

Before inserting the tube OF, the collet (8) and collar (
9) is in the state shown in FIG. When connecting pipe O1,
Insert the tube 08) through the opening of the collar (9) until its tip abuts against the tube stop 01 provided inside the joint body (1). Now, when the collar (9) is pressed forward, each movable piece OD of the collet (8) is bent inward and pushed into the collar (9), as shown in FIG. In this state, the rear end of the movable piece OD has a straight surface (
9b), it is lightly pressed inward, and the locking edge 0 force slightly bites into the outer surface of the pipe Oa, thereby locking the pipe a.

In this way, the pipe 08) is locked, but in this state,
Since each movable piece 00 of the collet (8) has not yet reached the rear tapered surface of the collar (9), the locking force is still insufficient. Therefore, in order to further increase this locking force, if the tube 0 is subsequently pulled backwards, or if a force directed backwards is applied to the tube OE due to the pressure of the fluid,
Since the collet (8) is locked to the pipe 081, the pipe (
The collar (9) also moves rearward together with the collet (8), and the annular protrusion (b) at the front end of the collar (9) is pushed inside the rear end of the joint body (1). It comes into contact with the protrusion Oe and stops. This situation is shown in FIG.

In the state shown in Fig. 3, the movable piece θ0 of the collet (8) is still in front of the tapered surface 07) of the collar (9), so the locking force does not increase, but whether the pipe OI is pulled more strongly or
Alternatively, when a backward force is applied due to fluid pressure, only the collet (8) moves backward together with the pipe Ol,
- The rear end of the movable piece OD comes into contact with the tapered surface 07). Then, since the movable piece 00 is pushed inward along the tapered surface n, its locking edge surface bites into the outer surface of the pipe Om more strongly, and the locking force increases dramatically. In this way, after the locking edge surface is very strongly locked to the pipe 0, the collar (9) is also strongly pressed outward by the collet (8), so the collar (9) does not move easily. Together they are held in place.

To remove the tube OI inserted and locked as described above, first hold the collar (9) at the rear end position and forcefully push the tube 08) forward, then pull it backward. When 0υ is pushed forward, only the collet (8) moves together with the tube 00, and as shown in Figure 4, the collar (9) and collet (8) are disengaged, and the movable piece of the collet (8) (11) almost comes out from inside the collar (9), so the locking force of the movable piece (!θ) tube 0I is either completely absent or becomes very small.

Therefore, if the tube OfO is pulled rearward at this point, it can be easily pulled out.

Note that the pipe OI inserted into the joint body (1) is inserted into the through hole (6).
Since the O-ring (C) is fitted into the annular groove formed in the peripheral wall of the pipe 0110, this O-ring (C) prevents fluid from leaking between the pipe 0110 and the joint body (1).

〔Effect of the invention〕

This invention has the configuration described above, and has a tube 0.
[Connection D can be made by inserting the tube OF, pushing the collar (9) forward, and then pulling the tube 08) backwards, or by simply applying a force directed backwards to the tube OI by fluid pressure. In addition, since the removal can be performed by simply pushing the tube side forward and then pulling it backward, the connection and removal operations of the tube 0ω can be performed with small force and very easily. Furthermore, the movable piece (11) of the collet (8) locks the pipe OIl with a very large force due to the action of the tapered surface of the collar (9), so the locking force of the pipe OI is very large and the pipe It has an excellent effect of being difficult to remove.

Further, the present invention provides a locking edge 02 of the collet (8).
Since the pipe OI is pulled out after removing the collet (8) from the outer surface of the pipe O1, there is almost no risk of damaging the outer surface of the pipe A during removal, and the collet (8) can be manufactured as a synthetic resin molded product. Therefore, it also has the effect of being able to be manufactured easily and at low cost.

[Brief explanation of the drawing]

The figure shows an embodiment of the pipe joint of the present invention,
Figure 1 is a half-sectional front view of the pipe fitting before inserting the pipe, Figure 2 is a half-sectional front view when the pipe is inserted into the fitting body, and Figure 3 is a half-sectional front view of the pipe fitting before inserting the pipe. FIG. 4 is a half-sectional front view showing the state when the tube is firmly locked, FIG. 4 is a half-sectional front view showing the state where the tube is pushed forward from the state of FIG. , is an enlarged cross-sectional view of the collet and collar separated from each other.

Claims (1)

[Claims] 1. A joint body (1) provided with a pipe connection part (4) at the rear;
A collet (8) is provided inside the pipe connection part (4) so that the movable part (8a) can move back and forth with the movable part (8a) facing backward, and behind the collet (8), it is attached to the pipe connection part (4) back and forth. It consists of a collar (9) which is movably attached and has a tapered surface (17) inclined rearward on its inner surface, and the collar (9), at the rear end position, is attached to the movable piece (11) of the collet (8). ) is moved forward relative to the collet (8) without pressing it inward, the collet (8)
The movable piece (11) is configured to enter the inside of the collar (9) and be largely bent inward by the tapered surface (17) to lock the outer surface of the tube (18). pipe fittings. 2. The pipe joint according to claim 1, wherein a straight surface (9b) is formed in front of the tapered surface (17) of the collar (9). 3. On the inside of the front end of the collar (9), there is a tapered surface (9a
) is formed in the pipe joint according to claim 1 or 2. 4. The pipe joint according to claim 1, wherein the outer rear end of each movable piece (11) of the collet (8) is cut out to have a flat surface or a substantially arcuate cross section.