JP3216751B2 - 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 for connecting a socket and a plug with one touch.

[0002]

2. Description of the Related Art In this type of pipe joint, a spring is generally urged to the outer periphery of a socket by a spring in a connecting direction.
The sleeve that moves forward and presses the locking member in the centripetal direction, retreats, and the sleeve that releases the pressing is slidably fitted.When not connected, the sleeve is held at the retracted position,
When the plug is inserted into the socket at the time of connection, the holding of the sleeve in the retracted position is released, and the sleeve moves forward by the bias of the spring, presses the locking member in the centripetal direction, and connects the socket and the plug. I have. As means for holding the sleeve in the retracted position and releasing the holding by inserting a plug, a holding member for supporting the locking member on the outer peripheral surface in a socket and preventing the sleeve from being immersed in the socket is conventionally used. There is a configuration in which a ring is slidably fitted, and a spring is interposed between the socket and the holding ring to advance the holding ring to a position for supporting the locking member.

According to this structure, the upper portion of the locking member supported by the presser ring protrudes outside the socket, the sleeve is locked at the protruding portion to be held at the retracted position, and the plug is inserted. Then, when the retaining ring is pushed by the distal end of the plug and retreats, the retaining ring is disengaged from the engaging member, and when the engaging groove of the plug reaches the lower part of the engaging member, the engaging member pushed by the sleeve is retracted. Then, the locking member is locked in the locking groove of the plug, and the sleeve is released from the locking by the locking member and moves forward to press the locking member in the centripetal direction. The connected socket and plug are sealed by an O-ring provided on the inner peripheral surface of the socket, and the O-ring is mounted in a groove formed on the inner peripheral surface of the socket.

[0004]

According to the above-mentioned conventional one-touch type pipe joint, when connecting the socket to the plug, when inserting the plug into the socket, the plug is inserted against the elastic force of the spring. Therefore, a strong force is required to insert the plug. In addition, since the presser ring and the spring for urging the presser ring are fitted into the socket, the socket becomes longer and larger in diameter, which makes it difficult to make the socket compact. Also, since the O-ring for sealing between the connected socket and plug is mounted in a groove formed on the inner peripheral surface of the socket, the outer diameter of the O-ring is larger than the inner diameter of the socket, and therefore the O-ring is mounted in the groove. There is a problem that the work is troublesome.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a pipe joint which aims at facilitating connection between a socket and a plug, making the socket compact, and further facilitating the assembling work. Is what you do.

[0006]

According to the present invention, in order to achieve the above object, a spring is connected to the outer periphery of a socket in which a locking member is fitted in a through-groove formed at the tip so that it can protrude and retract in a centrifugal direction. A pushing / releasing portion which is urged in the direction, moves forward, presses the locking member in the centripetal direction, and retreats to release the pressing of the locking member; and a locking formed at an appropriate position on the outer periphery of the socket at the retracted position. A sleeve provided with an elastic locking piece which is locked to the projection and held at the same position is slidably disposed, and in the pressing / releasing portion, the inner peripheral surface thereof is slidable on the outer periphery of the socket. A pressing surface for pressing the locking member in the centripetal direction at the forward position and a release portion for releasing the pressing of the locking member at the distal end side, and in the elastic locking piece, Provided axially in a notch groove wider than the locking projection formed on the pressing / release part The distance between the lower surface of the elastic locking piece and the lower surface of the pressing / release portion is the height of the locking protrusion, and the tip of the elastic protrusion is swelled downward and can be locked to the locking protrusion. When the sleeve is retracted and the locking member is located at the release portion of the pressing / release portion, the tip of the locking head is locked to the locking projection to secure the sleeve. The plug is inserted into the socket and moved in the centrifugal direction, and the socket is moved upward by pushing the elastic locking piece locked on the locking projection. A pressing member for detaching the portion from the locking projection is provided so as to be able to protrude and retract in the centrifugal direction.Furthermore, the sleeve engages with a guide projection formed on the outer periphery of the socket to regulate the rotation of the sleeve, A guide groove which can be moved only in the axial direction was formed.

A step is formed on the inner peripheral surface of the socket, and an annular surface member having an end surface facing the end surface of the step is inserted into the socket and fixed at a predetermined position. A mounting groove for mounting an O-ring for sealing between the socket and the plug was formed on the inner peripheral surface of the socket at the end surface of the step portion and the end surface of the surface member.

[0008]

A locking projection is formed at an appropriate position on the outer periphery of the socket, and a locking head formed at the tip of the sleeve at the retracted position is locked to the locking projection to hold the sleeve at the retracted position. A stopper is provided, and the socket is pushed and moved in the centrifugal direction by insertion of a plug, and the locking head pushes up the elastic locking piece which is locked to the locking projection to disengage from the locking projection. Since the pressing member to be moved is provided movably in the centrifugal direction, when the sleeve is retracted against the spring, the locking head at the tip of the elastic locking piece provided on the sleeve is formed by the locking projection formed on the outer periphery of the socket. When the sleeve is released upward and gets over it and releases the retraction of the sleeve, the tip of the locking head formed on the elastic locking piece is locked by the locking projection, and the sleeve is resilient by the spring of the spring. Retracted position against force It is equity. Then, when the plug is inserted into the socket from this state, the pressing member provided on the socket is pushed and moved in the centrifugal direction, and pushes up the locking head of the elastic locking piece that is locked on the locking projection, thereby increasing the locking projection. Let go. As a result, the sleeve is released from the regulation by the locking projection, moves forward by the elastic force of the spring, and presses the locking member in the centripetal direction. Further, the sleeve has a guide groove which engages with a guide projection formed on the outer periphery of the socket and regulates the rotation of the sleeve so as to be movable only in the axial direction. When the guide protrusion and the guide groove of the sleeve are engaged with each other, by setting the elastic locking piece to be positioned on the locking protrusion of the socket, the position of the elastic locking piece and the locking protrusion of the socket can be changed. Positioning can be performed reliably.

A step is formed on the inner peripheral surface of the socket, and an annular surface member having an end surface facing the end surface of the step is inserted into the socket and fixed at a predetermined position.
A mounting groove for mounting an O-ring for sealing between the socket and the plug is formed on the inner peripheral surface of the socket between the end surface of the step portion and the end surface of the surface member, so that the outer diameter of the O-ring is the same as the inner diameter of the socket. Since the diameter can be reduced, the O-ring can be easily inserted into the socket, and after inserting the O-ring, the surface member is inserted into the socket and fixed, so that the O-ring is mounted on the socket. Can be easily performed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. In the drawings, reference numeral 1 denotes a socket, and reference numeral 2 denotes a through groove formed at the tip of the socket 1. The through-groove 2 is formed so that both side surfaces 3 in the circumferential direction are parallel.
A step portion 4 is formed on the inner circumferential side of the both side surfaces 3.
5 is formed to have substantially the same diameter as the groove shape of the through groove 2,
And an arcuate locking member fitted so as to be able to protrude and retract in the centrifugal direction. The circumferential side surfaces 6 of the locking member 5 are surfaces guided by the side surfaces 3 of the through groove 2, and the step portions 4 of the through groove 2 are provided at both lower ends in the same direction. And a locking portion 7 is formed to prevent the locking member 5 fitted in the through groove 2 from further entering the socket 1.

On the lower surface of the locking member 5, a locking portion 10 for locking in a locking groove 9 formed on the outer periphery of the plug 8 is projected, and the locking portion 7 of the locking member 5 is When the locking member 10 is locked to the step portion 4, the locking portion 10 formed on the lower surface of the locking member 5 projects into the socket 1, and the upper surface of the locking member 5 is flush with the outer peripheral surface of the socket 1. Or it is configured to be inside.

Reference numeral 11 denotes an outer periphery of the socket 1, and
The locking projection is formed on the rear side of the sleeve, and is locked by an elastic locking piece of the sleeve described later to hold the sleeve at the retracted position. Reference numeral 12 denotes a through groove formed in the socket 1 on the rear side of the locking projection 11. A step portion 13 is formed on a circumferential wall surface of the through groove 12.

A pressing member 14 is fitted into the through groove 12 so as to be able to protrude and retract in the centrifugal direction. At the upper part on both sides in the circumferential direction of the pressing member 14, the pressing member 14 is engaged with the step 13 of the through groove 12 so as to prevent the pressing member 14 fitted in the through groove 12 from further immersing into the socket 1. Locking step 15 is formed. When the locking step 15 is locked to the step 13 of the through groove 12, the lower portion of the pressing member 14 projects into the socket 1, and the upper surface thereof is flush with the outer peripheral surface of the socket 1. Is configured. When the plug 8 is inserted into the socket 1, the pressing member 14 is pushed in the centrifugal direction by the tapered surface 16 formed on the outer periphery of the plug 8, and the upper portion protrudes to the outer periphery of the socket 1, and the locking projection 11 The elastic locking piece of the sleeve that is locked to the sleeve is pushed up, and the elastic locking piece is detached from the locking projection 11.

Reference numeral 17 denotes a step formed on the inner peripheral surface of the socket 1. The step 17 forms an end face 18 on the distal end side of the socket 1. 19 is the end face 1 of the step 17
An O-ring that is inserted into the socket 1 and seals between the socket 1 and the plug 8 by the end surface 18 of the step 17 and the surface member 19; The mounting groove 22 for mounting the mounting 21 is formed. The surface member 19 is fixed to the socket 1 with a predetermined space between the end surface 18 of the step portion 17 and the mounting groove 22, and penetrates to a position on the socket 1 where the surface member 19 is fixed. A groove 23 is formed, while a locking groove 24 is formed on the outer periphery of the surface member 19, and the through groove 23 and the surface member 1 are formed.
9 are aligned with each other, a locking piece 25 is inserted into the through groove 23 from the outer periphery of the socket 1, and the leading end thereof is locked in the locking groove 24 of the surface member 19, so that a predetermined position in the socket 1 is maintained. The surface member 19 is fixed at the position. 26 is socket 1
Formed on the outer circumference of the sleeve, to regulate the rotation of the sleeve described later,
The guide projection is moved only in the axial direction.

Reference numeral 27 denotes an engagement member which is fitted slidably in the axial direction on the outer periphery of the socket 1, is urged in the connection direction by a spring 28, advances and engages with the through groove 2 of the socket 1. It is a sleeve that presses in the centripetal direction and retreats to release the pressing of the locking member 5. The front of this sleeve 27
On its inner peripheral surface, a pressing portion 29 slidably contacting the outer periphery of the socket 1 and pressing the locking member 5 in a centripetal direction and a releasing portion 30 releasing the pressing of the locking member 5 are formed. It is a part 31.

The pressing / releasing portion 31 is formed with a notch groove 32 which is slightly wider in the axial direction than the locking protrusion 11 at a position corresponding to the locking protrusion 11 formed on the outer periphery of the socket 1. In the groove 32, an elastic locking piece 33 is provided in the axial direction. The elastic locking piece 33 is
Is retracted, and the locking member 5 is released from the release portion 3 of the pressing / release portion 31.
When it is located at 0, its tip is locked to the locking projection 11 to prevent the sleeve 27 from advancing, and to hold the sleeve 27 at the retracted position against the elastic force of the spring 28; It has a resilient force in the centrifugal direction, and is expanded in the same direction by being pushed in the centrifugal direction by the pressing member 14 of the socket 1, and its tip comes off the locking projection 11.

As shown in FIG. 13, the elastic locking piece 33 is formed to have a thickness smaller than the thickness of the pressing / releasing portion 31, and the lower surface thereof is higher than the lower surface of the pressing / releasing portion 31, The upper surface is lower than the upper surface of the pressing / releasing unit 31. The distance between the lower surface of the elastic locking piece 33 and the lower surface of the pressing / release portion 31 is the height of the locking projection 11 to which the tip of the elastic locking piece 33 is locked. At the tip of the elastic locking piece 33, a locking head 34 bulging to the lower surface side and locking to the locking projection 11 is formed. Also, the elastic locking piece 33
The distance between the upper surface of the elastic member and the upper surface of the pressing / releasing portion 31 is determined by the elastic locking piece 33 being pressed by the pressing member 14 and the locking head 3 at the tip thereof.
Even if the projections 4 are disengaged from the locking projections 11, the spacing is such that the upper surface does not protrude above the upper surface of the pressing / releasing portion 31.

Reference numeral 35 denotes a guide groove formed in the inner peripheral surface of the pressing / releasing portion 31 in the axial direction. The guide groove 35 is engaged with the guide projection 26 formed on the outer periphery of the socket 1, so that the rotation of the sleeve 27 fitted on the outer periphery of the socket 1 is restricted, and the guide groove 35 moves only in the axial direction. When the guide projection 26 is engaged with the groove 35, the sleeve 27
The notch groove 32 and the elastic locking piece 33 are positioned so as to be located on the locking projection 11 of the socket 1.

Reference numeral 36 denotes a retaining projection formed in the guide groove 35. When the sleeve 27 advances to a predetermined position, it is locked to the guide projection 26 to prevent further advance. . Reference numeral 37 denotes a cover fitted to the outer periphery of the front portion of the sleeve 27, which prevents the pressing / release portion 31 from spreading. A groove 42 is formed in the inner peripheral surface of the cover to allow the elastic locking piece 33 to expand when the elastic locking piece 33 is pressed by the pressing member 14. In this embodiment, the sleeve 27 and the cover 37 are divided, but may be formed integrally.

Reference numeral 38 denotes a fluid passage formed in the socket 1, and reference numeral 39 denotes a valve movably provided in the fluid passage 38. The valve 39 is urged by a spring 40 in the distal direction (connection direction). The valve 39 is in contact with a valve seat 41 formed on the inner periphery of the fluid passage 38 to shut off the fluid passage 38 and open the fluid passage 38 against the elastic force of the spring 40. When the plug 8 is connected to the plug 8, the plug 8 is pushed by the tip of the plug 8 inserted into the socket 1 and retreats.

Next, the connection between the socket 1 and the plug 8 having the above configuration will be described. First, the non-connection state (connection standby state) will be described. The sleeve 27 fitted on the outer periphery of the socket 1 is retracted against the elastic force of the spring 28, and the locking head 34 of the elastic locking piece 33 is locked on the locking projection 11 formed on the outer circumference of the socket 1. Let it. This allows
The sleeve 27 is held at the retracted position, and the locking member 5 fitted in the through groove 2 of the socket 1 is located at the position of the release portion 30 of the pressing / release portion 31 of the sleeve 1. The pressing member 14 fitted in the groove 12 is pressed in the centripetal direction by the lower surface of the locking head 34 of the elastic locking piece 33 provided on the sleeve 1, and a part of the pressing member 14 projects into the socket 1. . This is a non-connection state (connection standby state) (FIG. 1).

In connection between the socket 1 and the plug 8,
The plug 8 is inserted into the socket 1 in the above state. As a result of the insertion of the plug 8, first, the locking member 5 of the socket 1 is pushed out in the centrifugal direction by the outer peripheral surface of the plug 8, and the upper portion thereof projects to the outer periphery of the socket 1. When the insertion of the plug 8 is further continued, the pressing member 14, a part of which is protruding into the socket 1, is pushed out in the centrifugal direction by the outer periphery of the plug 8, and the upper portion protrudes to the outer periphery of the socket 1. As a result, the elastic locking piece 33 that presses the pressing member 14 in the centripetal direction is pushed and expanded, and the tip end, that is, the locking head 34 comes off the locking projection 11 (FIG. 2).

The insertion of the plug 8 is further continued, and when the locking groove 9 formed on the outer periphery of the plug 8 reaches the lower part of the locking member 5, the locking member 5 projecting upward from the outer periphery of the socket 1 is moved. Under the pressure of the sleeve 27, it is immersed in the centripetal direction, and the locking portion 10 at the lower portion protrudes into the socket 1 and locks in the locking groove 9 of the plug 8.
7 is advanced by the elastic force of the spring 28, and the upper surface of the locking member 5 is pressed by the pressing portion 29 of the pressing / releasing portion 31. This prevents the locking member 5 from coming out of the locking groove 9 and connects the socket 1 and the plug 8 (FIG. 3).

As described above, the connected socket 1
To separate the plug and the plug 8, the sleeve 27 is retracted against the elastic force of the spring 28, the pressing portion 29 pressing the upper surface of the locking member 5 is separated from the upper surface, and the release portion 30 is engaged. It is located on the stop member 5. This allows the locking member 5 to move in the centrifugal direction. When the plug 8 is pulled from the socket 1 in this state, the locking member 5 moves in the centrifugal direction, comes off the locking groove 9 of the plug 8, and the socket 1 and the plug 8 are separated.

Then, the sleeve 27 is further retracted,
By locking the locking head 34 of the elastic locking piece 33 to the locking projection 11 formed on the outer periphery of the socket 1, the sleeve 27 is held at the retracted position, and the locking member 5 is And the pressing member 14 is pressed in the centripetal direction by the lower surface of the locking head 34 of the elastic locking piece 33 provided on the sleeve 1, and a part thereof projects into the socket 1. Becomes disconnected (waiting for connection)
(FIG. 1).

[0026]

As described above, according to the pipe joint of the present invention, a locking projection is formed at a suitable position on the outer periphery of the socket, and the tip of the sleeve is locked to the locking projection at the retracted position. An elastic locking piece for holding the sleeve at the retracted position is provided, and the socket is pressed and moved in the centrifugal direction by inserting a plug, and the pressing member locked on the locking projection is moved in the centrifugal direction. When the sleeve is inserted into the socket while the sleeve is held at the retracted position, the pressing member is pushed in the centrifugal direction by the outer periphery of the plug and is locked to the locking projection. By pushing up the stop piece, the elastic locking piece disengages from the locking projection, whereby the sleeve is released from the regulation by the locking projection, advances by the spring force, and presses the locking member in the centripetal direction. , Socket And the plug are connected, but since the detachment of the elastic locking piece from the locking projection can be removed with a small force, the force for pushing the pressing member in the centrifugal direction can be small, and therefore, when connecting the socket and the plug, Since a strong force is not required for inserting the plug, the connection operation can be easily performed.

Further, as means for holding the sleeve at the retracted position, there is no need for a structure such as a conventional holding ring in the socket, so that the socket can be made smaller in diameter and the pipe joint can be made more compact. Can be planned.

Further, a step is formed on the inner peripheral surface of the socket, and an annular surface member having an end surface facing the end surface of the step is inserted into the socket and fixed at a predetermined position. A mounting groove for mounting an O-ring for sealing between the socket and the plug is formed on the inner peripheral surface of the socket between the end surface of the step portion and the end surface of the surface member, so that the outer diameter of the O-ring is the same as the inner diameter of the socket. Since the O-ring can be easily inserted into the socket, and after inserting the O-ring, the surface member is inserted into the socket and fixed, so that the O-ring can be mounted on the socket. It can be easily performed and the assembling work can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing one embodiment of the present invention.

FIG. 2 is a vertical side view showing a connection process between a socket and a plug.

FIG. 3 is a longitudinal sectional side view showing a connection state between a socket and a plug.

FIG. 4 is a partially cutaway perspective view of a socket.

FIG. 5 is a partial longitudinal sectional side view of a partially omitted socket.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is a front view showing a locking member.

FIG. 8 is a partially omitted side view showing the vicinity of the distal end of the socket.

FIG. 9 is a sectional view taken along line BB of FIG. 5;

FIG. 10 is a front view showing a pressing member.

FIG. 11 is a partially longitudinal side view showing a surface member.

FIG. 12 is a sectional view taken along line CC of FIG. 5;

FIG. 13 is a front view showing a locking piece.

FIG. 14 is a partially longitudinal side view showing a sleeve.

FIG. 15 is a left side view of FIG. 14;

FIG. 16 is a right side view of FIG. 14;

FIG. 17 is a partially enlarged sectional view of a sleeve.

FIG. 18 is a partially longitudinal side view showing a cover.

FIG. 19 is a left side view of FIG. 18;

[Explanation of symbols]

1 …………………………………………………
……… Socket 2 ……………………………………………
………… Groove 5 …………………………………………………
…………………………………………………………………………
………… Plug 9 ……………………………………………
………… Locking groove 11 ………………………………………………
…………………………………………………………………………
………… Pressing member 17 ……………………………………………
……………………………………………………………………
………………………………………………………………………………………………
……………………………………………………………………………………………………………
………… End face 21 ………………………………………………
……… O-ring 22 ………………………………………………
………… Mounting groove 27 ………………………………………………
………… Sleeve 28 ………………………………………………
………… Spring 33 ………………………………………………
………… Elastic locking piece

Claims (2)

(57) [Claims] An outer periphery of a socket in which a locking member is fitted in a through-groove formed at the tip so as to be able to protrude and retract in a centrifugal direction is urged in a connecting direction by a spring, and moves forward to move the locking member in a centripetal direction. A pressing / releasing portion for pressing and retreating to release the pressing of the locking member, and an elastic locking piece for locking to a locking projection formed at an appropriate position on the outer periphery of the socket at the retracted position and holding the same at the same position. The sleeve provided is slidably disposed. In the pressing / release portion, the inner peripheral surface thereof slidably contacts the outer periphery of the socket, and the locking member is moved in the centripetal direction at the advanced position. A release surface for releasing the pressing of the locking member is formed on the pressing surface to be pressed and the distal end side, and in the elastic locking piece, a notch wider than the locking projection formed on the pressing / release portion. The elastic locking piece is provided in the groove in the axial direction.
The distance from the lower surface of the release portion is defined as the height of the locking projection, and a tip of the locking projection is formed with a locking head that swells downward and can be locked to the locking projection. When the stop member is located at the release portion of the pressing / release portion, the tip of the locking head is locked to the locking projection to hold the sleeve at the retracted position. Is pushed and moved in the centrifugal direction by the insertion of the plug, and pushes up the elastic locking piece that is locked to the locking projection, and the pressing member that separates the locking head from the locking projection protrudes and retracts in the centrifugal direction. Further, the sleeve is engaged with a guide projection formed on the outer periphery of the socket to restrict rotation of the sleeve.
A pipe joint with a guide groove that can be moved only in the axial direction. 2. A step is formed on the inner peripheral surface of the socket, and an annular surface member having an end surface facing the end surface of the step is inserted into the socket and fixed at a predetermined position. 2. The pipe joint according to claim 1, wherein an installation groove for mounting an O-ring for sealing between the socket and the plug is formed on an inner peripheral surface of the socket at an end surface of the portion and an end surface of the surface member.