JP2553690Y2 - 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 which can be easily connected and disconnected.

[0002]

2. Description of the Related Art As a conventional pipe joint, for example, there is one as shown in FIG. 8, and as shown in FIG. 8, a cylindrical main body 1 having a connecting portion composed of a male screw portion is coaxially coaxial therewith. The holding cylinder 3 is interposed between the advancing / retracting thin cylinder 2 and the main body 1 so as to be able to reciprocate.

As shown in FIG. 1, the main body 1 has a hose insertion port 10 at one end thereof.
A tapered portion 11 having a shorter diameter is formed on the inner peripheral portion near zero. The holding cylinder 3 is, as shown in FIG.
A slit 30 that opens toward the hose insertion port 10 side is formed in the peripheral wall, so that the diameter can be expanded and reduced by a pressing force from the outer peripheral direction.

When the fluid pressure acts on the advance / retreat tube 2, the holding tube 3 is pushed out by the projecting portion of the advance / retreat tube 2 and moves to the hose insertion port 10 side. Therefore, when the fluid pressure acts, the holding cylinder 3 and the reciprocating thin cylinder 2
Is moved together with the hose to the hose insertion port 10 side, and from the time when the holding cylinder 3 comes into contact with the tapered portion 11 described above, a pressing force acts on the holding cylinder 3 from the tapered portion 11 to reduce the diameter. I do. And, with the deformation of the holding cylinder 3,
The holding force on the hose by the holding cylinder 3 and the advance / retreat thin cylinder 2 increases, and the hose is prevented from falling off.

[0005] However, when the above-mentioned pipe joint is used in such a manner that the action / inaction of the fluid pressure frequently changes,
The hose is clamped / opened by the holding cylinder 3 and the advancing / retracting thin cylinder 2 each time due to the advance / retreat movement of the advancing / retreating thin cylinder 2 accompanying the change, and as a result, the connection portion of the hose is damaged in a short period of time. The damage in the hose results in a fluid leak.

[0006]

SUMMARY OF THE INVENTION In view of the above, the present invention provides a pipe joint in which the connecting portion of the hose is less likely to be damaged even when it is used in a mode in which the action and non-action of the fluid pressure frequently change. As an issue.

[0007]

Means for Solving the Problems The invention according to claim 1 is:
A main body that is formed in a cylindrical shape with one end open at both ends and has a tapered portion on the inner surface that decreases in diameter toward the hose insertion port, and is mounted within this main body coaxially with a certain range so as to be able to advance and retreat. And a holding cylinder interposed between the main body and the advance / retreat thin cylinder so as to be able to advance / retreat between the main body and the advance / retreat thin cylinder, and a hose is provided between the holding cylinder and the advance / retreat thin cylinder via a hose insertion port. When the advance / retreat thin tube and the holding tube are advanced to the hose insertion port side in the state of being inserted, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the hose is sandwiched between the holding tube and the advance / retreat thin tube. In the pipe joint of the type described above, the inner peripheral surface of the main body is provided with an elastic supporting claw that is inclined toward the axis of the main body toward the hose insertion port, and in a state where the hose is sandwiched between the holding cylinder and the advance / retreat thin cylinder. , The inner end of the elastic support claw is the outer periphery of It is assumed that is to pressure the state to.

The invention according to a second aspect of the present invention is directed to a main body which is formed in a cylindrical shape having one end open to a hose insertion port and has a tapered portion on the inner surface which is reduced in diameter toward the hose insertion port. It is composed of an advance / retreat thin tube mounted on the same axis as it can move forward and backward in a certain range, and a holding tube interposed between the main body and the advance / retreat thin tube so as to be able to advance and retreat, and through a hose insertion port. When the advancing / retreating thin tube and the holding tube are advanced toward the hose insertion port with the hose inserted between the holding tube and the advancing / retracting thin tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding is performed. In a pipe joint of a type in which a hose is sandwiched between a cylinder and the advance / retreat thin tube, an annular plate having an elastic supporting claw on an inner peripheral portion is attached to an inner peripheral surface of the main body, and the elastic supporting claw is attached to a hose insertion port. The hose is inclined toward the axis of the main body toward In a state of being sandwiched by the holding cylinder and reciprocating tube member, it is assumed that the inner end of the elastic support pawls is in pressure contact with the outer peripheral surface of the reciprocating tube member.

The invention according to a third aspect of the present invention is directed to a main body which is formed in a tubular shape having one end open to a hose insertion port and has a tapered portion on the inner surface which is reduced in diameter toward the hose insertion port, It is composed of an advance / retreat thin tube mounted on the same axis as it can move forward and backward in a certain range, and a holding tube interposed between the main body and the advance / retreat thin tube so as to be able to advance and retreat, and through a hose insertion port. When the advancing / retreating thin tube and the holding tube are advanced toward the hose insertion port with the hose inserted between the holding tube and the advancing / retracting thin tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding is performed. In a pipe joint of a type in which a hose is sandwiched between a cylinder and the advance / retreat thin tube, an elastic supporting claw is provided on an inner peripheral surface of the main body toward an axis side of the main body toward the hose insertion port, and the hose is held. In the state of being sandwiched between the cylinder and the advance / retreat thin cylinder, At least a portion of the inner end of sexual supporting pawls is assumed that a fitted state in a groove is provided on the outer peripheral surface of the reciprocating tube member.

The invention according to a fourth aspect of the present invention is directed to a main body which is formed in a tubular shape having one end open to a hose insertion port and has a tapered portion on an inner surface which is reduced in diameter toward the hose insertion port, It is composed of an advance / retreat thin tube mounted on the same axis as it can move forward and backward in a certain range, and a holding tube interposed between the main body and the advance / retreat thin tube so as to be able to advance and retreat, and through a hose insertion port. When the advancing / retreating thin tube and the holding tube are advanced toward the hose insertion port with the hose inserted between the holding tube and the advancing / retracting thin tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding is performed. In a pipe joint of a type in which a hose is sandwiched between a cylinder and the advance / retreat thin tube, an annular plate having an elastic supporting claw on an inner peripheral portion is attached to an inner peripheral surface of the main body, and the elastic supporting claw is attached to a hose insertion port. The hose is inclined toward the axis of the main body toward In a state of being sandwiched by the holding cylinder and reciprocating tube member, it is assumed that at least a portion of the inner end of the elastic support pawls is in the fitted state in a groove is provided on the outer peripheral surface of the reciprocating tube member.

[0011]

The present invention operates as follows. (Effects of the Invention According to Claims 1 and 2) On the inner peripheral surface of the main body, there is an elastic supporting claw that is inclined toward the axis of the main body toward the hose insertion port, and the hose is held between the holding cylinder and the reciprocating thin cylinder. In the retracted state, the inner end of the elastic support claw is pressed against the outer peripheral surface of the advance / retreat thin tube, so that the advance / retreat thin tube moves toward the hose insertion port side (forward).
Is easy in a mode in which the inner end of the elastic support claw slides on the outer peripheral surface of the advance / retreat thin tube. On the contrary, the movement (retreat) of the advance / retreat thin tube to the side opposite to the hose insertion port is elastic. It is prevented by the pressing force between the inner end of the support claw and the outer peripheral surface of the advance / retreat thin tube.

Therefore, even if the state where the fluid pressure is applied changes to the state where the fluid pressure is not applied and the advance / retreat thin tube attempts to retreat, the movement is prevented. (Effects of the Inventions of Claims 3 and 4) On the inner peripheral surface of the main body, there is an elastic supporting claw that is inclined toward the axis of the main body toward the hose insertion port, and the hose is held between the holding cylinder and the reciprocating thin cylinder. In the retracted state, the inner end of the elastic support claw is fitted in the groove provided on the outer peripheral surface of the advance / retreat thin tube, so that the movement (forward) of the advance / retreat thin tube toward the hose insertion port side is The mode in which the inner end of the elastic support claw slides on the outer peripheral surface of the advance / retreat thin tube is facilitated. Conversely, the movement (retreat) of the advance / retreat thin tube to the side opposite to the hose insertion port is performed by the elastic support claw. Is prevented by the engaging force between the inner end of the groove and the constituent wall of the groove.

Accordingly, even if the state where the fluid pressure is applied is changed to the state where it is not applied and the advance / retreat thin tube attempts to retreat, the movement is prevented.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of the present invention. (Embodiment 1) As shown in FIG. 1, this pipe joint is basically attached to a cylindrical main body 1 having both ends open, and is slidably mounted within the main body 1 coaxially with a certain range. A retractable tube 2, a holding tube 3 interposed between the main body 1 and the retractable tube 2 so as to be capable of moving forward and backward, and a hose insertion port 10 integrated with the holder tube 3 and the retractable tube 2. And a pressing member 8 to be moved to the side.

The main body 1 includes a nipple 1 as shown in the drawing.
The hose 1 is formed by caulking a socket 1b to one end of the socket 1a. As shown in FIG. 1, the nipple 1a has a large-diameter hole portion 13 and a small-diameter hole portion 14 on its inner peripheral surface, and a connection-side end of the large-diameter hole portion 13 with the socket 1b is provided. An inwardly protruding piece 15 inclined toward the hose insertion port 10 is formed. As shown in FIG. 4, a groove 6 is provided around the wall of the large-diameter hole 13 near the inwardly protruding piece 15, and the groove 6 is used to make the groove 6 as shown in FIGS. In addition, a plurality of elastic supporting claws 90
Is attached to the nipple 1a.

The elastic support claws 90 are inclined toward the axis (inward) of the main body 1 toward the hose insertion opening 10 as shown in FIG. Is set to be smaller in diameter in the natural state than the middle diameter portion 21 described later and slightly larger than the small diameter portion 22. The socket 1b is, as shown in the figure, a cylindrical one having a constant thickness.
By reducing the diameter toward the tip, the hose insertion port 10
A tapered portion 11 is formed in a nearby inner peripheral portion. A through hole A is provided in the peripheral wall of the socket 1b.

As shown in FIG. 1, the reciprocating tube 2 has a large diameter portion 20, a medium diameter portion 21, a small diameter portion 22, and a hose insertion portion 23 arranged in this order. Is attached to the nipple 1a so as to be accommodated in the large-diameter hole portion 13. As shown in the figure, the large-diameter portion 20 is set to have a slightly smaller diameter than the large-diameter hole portion 13 of the nipple 1a, and a groove 25 is provided on the outer peripheral surface thereof. Is provided with an O-ring and a backup ring, so that fluid tightness between the large-diameter portion 20 of the advance / retreat thin tube 2 and the large-diameter hole portion 13 of the nipple 1a is ensured.

As shown in FIG. 1, the outer diameter of the middle diameter portion 21 is set slightly larger than the inner diameter of the above-mentioned inwardly projecting piece 15. As shown in the figure, the small-diameter portion 22 is set to have a slightly smaller diameter than the middle-diameter portion 21 and slightly larger than the inner diameter of the above-described inwardly projecting piece 15. Further, as shown in FIG. 1, the positional relationship between the small-diameter portion 22 and the through hole A is such that when the advancing / retreating thin tube 2 is retracted, the distal end of the holding cylinder 3 in the retracted state is the through hole A.
Is set so as to substantially coincide with the formation position. Therefore, in the range where the end of the elastic support claw 90 is on the small-diameter portion 22, the advance / retreat thin tube 2 can freely advance and retreat with little resistance, and, for example, insert and hold a rod-shaped body into the through hole A. If the forward movement of the cylinder 3 is prevented, the connection and disconnection of the hose can be easily performed in the above range.

As shown in FIG. 2, the hose insertion portion 23
The inner diameter of the hose H is substantially the same as that of the hose H to be connected, and a groove 26 is provided on the outer peripheral surface thereof. Further, an O-ring is mounted in the groove 26. When the hose H is held between the cylinder 2 and the holding cylinder 3,
The fluid tightness between the inner peripheral surface and the outer peripheral surface of the advance / retreat thin tube 2 is ensured. The advancing / retreating thin tube 2 is provided with a stepped portion between the large-diameter hole 13 and the small-diameter hole 14,
5 so as to be able to advance and retreat in a manner of sliding over almost the entire range.

The holding cylinder 3 is made of an elastic synthetic resin. As shown in FIGS. 1 and 2, the outer diameter of the holding cylinder 3 is set to be slightly larger than that of the hose insertion port 10, and the holding cylinder 3 is provided on the hose insertion port 10 side. A tapered portion 32 corresponding to the above-described tapered portion 11 is formed on the outer peripheral portion, and a plurality of locking claws 33 are provided around the inner peripheral portion of the holding cylinder 3. And
A slit 3 opened at one end of the outer peripheral wall of the holding cylinder 3
0 and slits (not shown) opened to the other end are provided alternately.

The pressing member 8 is formed of an annular thin plate, and is externally inserted into a stepped portion between the small-diameter portion 22 and the hose insertion portion 23 of the advance / retreat thin tube 2 as shown in FIG. Since this pipe joint is configured as described above, the hose H is moved through the hose insertion port 10 of the main body 1 to advance and retract the thin tube 2.
When fluid pressure acts on the hose H in a state of being inserted between the hose H and the holding cylinder 3, the hose H is integrally moved to the hose insertion port 10 via the pressing member 8 as shown in FIG. The retaining claw 33 of the holding cylinder 3 and the outer peripheral wall of the advance / retreat thin cylinder 2 are sandwiched by a strong force, and the retaining claw 33 bites into the outer peripheral surface of the hose.

Here, in the above state, the elastic support claws 90 ride on the middle diameter portion 21 from the small diameter portion 22 so that the inner end of the elastic support claw 90 and the medium diameter portion 21 of the advance / retreat thin cylinder 2 are separated. It is in a pressure contact state (see FIGS. 1 to 3). Therefore,
As described in the column of action, the advance / retreat thin tube 2 can be moved forward, and conversely, the retractable thin tube 2 cannot be moved backward. For this reason, even if the pipe joint is used in such a manner that the action and non-action of the fluid pressure frequently change, the connection portion of the hose H is not damaged in a short period of time. (Example 2) The pipe joint of this example has basically the same configuration as that of Example 1 described above, but as shown in FIG. 6, a plurality of circumferential grooves m ( A spiral groove may be employed as another mode corresponding to the groove in the column of means), and the elastic support is provided when the hose H is sandwiched between the holding cylinder 3 and the advance / retreat thin cylinder 2 as shown in FIG. Only the corner at the inner end of the claw 90 is fitted into the circumferential groove m provided on the outer peripheral surface of the advance / retreat thin tube 2.

As shown in FIG. 7, the width of the peripheral groove m is set to be slightly smaller than the thickness of the elastic supporting claw 90, and the diameter of the peripheral groove m corresponding to the bottom portion of the elastic supporting claw 90 is adjusted. The diameter is set slightly smaller than the diameter formed by the one end.
Therefore, the engagement between the elastic support claws 90 and the wall of the circumferential groove m is sufficient, and the hose H can be used in a short period of time even when it is used in such a manner that the change of the action / inaction of the fluid pressure frequently occurs.
Connection parts are not damaged.

In each of the above-described embodiments, the inner end of the elastic support claw 90 is flat, but the present invention is not limited to this, and the elastic support claw 90 may have an acute angle or an R shape. Further, in the pipe joint of this embodiment, the structure of the hose connection portion on one end side is such that the hose is externally screwed. However, the hose may be inserted and screwed, and furthermore, the structure by screw connection The present invention is not limited to this, and another connection structure may be adopted.

Furthermore, in the above embodiment, the main body 1 is configured so that the socket 1b is crimped to the nipple 1a. However, the present invention is not limited to this, and the nipple 1a and the socket 1b may be connected by means of a screw connection or the like. May be combined.

[0026]

[Effect of the Invention] The present invention has the following effects since it has the above-described configuration. Even if it is used in such a manner that the action of the fluid pressure frequently changes, the fluid is prevented from moving even if the advance / retreat thin tube changes from the state where the fluid pressure acts to the state where it does not act and tries to retreat. The hose connection will not be damaged in a short time.

That is, a pipe joint in which the connection portion of the hose is hard to be damaged can be provided even when used in a mode in which the action / inactivity of the fluid pressure frequently changes.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing a state where a hose is connected by the pipe joint.

FIG. 3 is an enlarged view of a main part of FIG. 2, showing a relationship between a middle diameter portion and an elastic supporting claw.

FIG. 4 is a perspective view of an annular plate used for the pipe joint.

FIG. 5 is a perspective view of another annular plate that can be used for the pipe joint.

FIG. 6 is a sectional view of a main part of a pipe joint according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a state where a hose is connected by the pipe joint of FIG. 6;

FIG. 8 is a sectional view of a conventional pipe joint.

[Explanation of symbols]

 m circumferential groove 1 main body 2 advance / retreat thin tube 3 holding tube 9 annular plate 11 tapered portion 90 elastic support claw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigenobu Usaya 4-9-6 Tsukushigaoka, Nishio City, Aichi Prefecture (72) Inventor Yasuo Kondo 71 Tonowaki, Hondamachi, Toyota City, Aichi Prefecture (56) References Kaihei 3-2777891 (JP, A)

Claims (4)

(57) [Scope of request for utility model registration] 1. A main body which is formed in a cylindrical shape with one end open to a hose insertion port and has a tapered portion on the inner surface which is reduced in diameter toward the hose insertion port, and has a constant coaxial shape in the main body. A forward / backward retractable tube attached to the main body and the forward / backward retractable tube, and a holding tube interposed between the main body and the forward / backward retractable tube. When the advance / retreat thin tube and the holding tube advance toward the hose insertion port side with the hose inserted between the holding tube and the holding tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding tube and the advance / retreat thin tube are reduced. In the pipe joint of the type in which the hose is clamped, the inner peripheral surface of the main body is provided with an elastic supporting claw inclined toward the axis of the main body toward the hose insertion port, and the hose is formed by the holding cylinder and the advance / retreat thin cylinder. In the pinched state, the inner ends of the elastic support claws advance. A pipe joint characterized by being in pressure contact with an outer peripheral surface of a retraction tube. 2. A main body which is formed in a cylindrical shape having one end open to a hose insertion port and has a tapered portion on an inner surface which is reduced in diameter toward the hose insertion port, and a coaxial body is provided in the main body. A forward / backward retractable tube attached to the main body and the forward / backward retractable tube, and a holding tube interposed between the main body and the forward / backward retractable tube. When the advance / retreat thin tube and the holding tube advance toward the hose insertion port side with the hose inserted between the holding tube and the holding tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding tube and the advance / retreat thin tube are reduced. In a pipe joint of a type in which a hose is clamped by, an annular plate having an elastic supporting claw on an inner peripheral portion is attached to an inner peripheral surface of the main body, and the elastic supporting claw is disposed on an axial side of the main body toward the hose insertion port. The hose is connected to the holding cylinder and the A pipe joint characterized in that the inner end of the elastic support claw is in pressure contact with the outer peripheral surface of the advance / retreat thin cylinder in the clamped state. 3. A main body which is formed in a cylindrical shape having both ends open at one end with a hose insertion port, and which has a tapered portion on the inner surface which is reduced in diameter toward the hose insertion port, and which is fixed coaxially within the main body. A forward / backward retractable tube attached to the main body and the forward / backward retractable tube, and a holding tube interposed between the main body and the forward / backward retractable tube. When the advance / retreat thin tube and the holding tube advance toward the hose insertion port side with the hose inserted between the holding tube and the holding tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding tube and the advance / retreat thin tube are reduced. In the pipe joint of the type in which the hose is clamped, the inner peripheral surface of the main body is provided with an elastic supporting claw inclined toward the axis of the main body toward the hose insertion port, and the hose is formed by the holding cylinder and the advance / retreat thin cylinder. In the pinched state, a small amount of the inner end of the elastic support pawl is A pipe joint characterized in that at least a part thereof is fitted in a groove provided on the outer peripheral surface of the advance / retreat thin tube. 4. A main body which is formed in a cylindrical shape with one end open to a hose insertion port and has a tapered portion on the inner surface which is reduced in diameter toward the hose insertion port, and is fixed coaxially within the main body. A forward / backward retractable tube attached to the main body and the forward / backward retractable tube, and a holding tube interposed between the main body and the forward / backward retractable tube. When the advance / retreat thin tube and the holding tube advance toward the hose insertion port side with the hose inserted between the holding tube and the holding tube, the holding tube is reduced in diameter by the pressing force from the tapered portion, and the holding tube and the advance / retreat thin tube are reduced. In a pipe joint of a type in which a hose is clamped by, an annular plate having an elastic supporting claw on an inner peripheral portion is attached to an inner peripheral surface of the main body, and the elastic supporting claw is disposed on an axial side of the main body toward the hose insertion port. The hose is connected to the holding cylinder and the A pipe joint wherein at least a part of an inner end of the elastic supporting claw is fitted in a groove provided on an outer peripheral surface of the reciprocating narrow tube in a state of being clamped and held.