JP2010230077A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint allowing locking confirmation only in a state where a plug has been locked to a socket. <P>SOLUTION: The pipe joint 1 includes: the plug 20; the socket 10; a locking mechanism locking the plug in the socket; and a locking confirmation mechanism for allowing the locking of the plug in the socket to be confirmed. The locking mechanism is in a locked state at the locking start position O and in the over-stroke range, and further has a backlash range. The locking confirmation mechanism has: a locking confirmation member 36 having a prescribed position with respect to the socket, and movable radially inward; and a circumferential groove 23b provided on the plug. This mechanism is configured to allow the locking of the plug to be confirmed by the locking confirmation member 36 moving radially inward and engaging with the circumferential groove 23b. The locking confirmation member 36 and the circumferential groove 23b are positioned to engage with each other when the plug is inserted into the range from the locking start position O to the over-stroke position. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe joint, and more particularly to a pipe joint capable of confirming that a plug inserted in a socket is locked.

  Conventionally, there has been known a pipe joint in which a lock mechanism provided in a socket automatically locks the plug with respect to the socket by inserting the plug into the socket (see, for example, Patent Documents 1 and 2).

  In the pipe joint 200 described in Patent Document 1, as shown in FIGS. 15 and 16, a substantially cylindrical sleeve 260 is fixed to the tip of the socket 240, and an outer cylinder 270 is attached so as to cover the sleeve 260. Yes. A plurality of spheres 276 are arranged in the annular recess 271a between the sleeve 260 and the outer cylinder 270 at equal intervals in the circumferential direction, and these spheres 276 are coil springs 274 via ring-shaped collar members 275 in the annular recess 271a. Is biased to the tip side and radially inward. In the sleeve 260, a long hole 262 a having a width shorter than the diameter of the sphere 276 is formed in the axial direction corresponding to each sphere 276, and a part of the biased sphere 276 passes through the long hole 262 a. It is held in a state of protruding into the sleeve 260.

  The plug 250 includes a small diameter portion 251 inserted into the seal member 242b of the socket 240 and a large diameter portion 253 having a larger diameter than the small diameter portion 251 and an outer diameter substantially equal to the inner diameter of the sleeve 260. The small diameter part 251 and the large diameter part 253 are continuous by the inclined surface of the inclined part 252. The large-diameter portion 253 is formed with an annular recess 253a into which a sphere is fitted adjacent to the inclined portion 252.

  In the pipe joint 200 of Patent Document 1, as shown in FIG. 15A, when the plug 250 is inserted into the sleeve 260, the ball 276 that contacts the inclined portion 252 is moved into the annular recess 271 a by the inclined portion 252. To move radially outward. When the plug 250 is further inserted, the ball 276 gets over the inclined portion 252 and fits into the annular recess 253a (FIG. 15B). As a result, the plug 250 is locked to the socket 240. In the locked state, the ball 276 further moves to the tip side in the annular recess 253a by the urging force of the coil spring 274 (FIG. 15C).

The pipe joint 200 is provided with an overstroke region where the plug 250 can be further pushed from the locked state. In the overstroke region, as shown in FIG. 16A, the inclined portion 252 abuts on the small diameter limiting portion 264 formed on the sleeve 260, thereby preventing further insertion of the plug 250. Further, the pipe joint 200 is provided with a backlash region in which the plug 250 can be moved in the direction of being pulled out while being locked. In the backlash region, as shown in FIG. 16 (b), the side surface (the left surface in the drawing) of the annular recess 253 a of the plug 250, the inner peripheral surface of the outer cylinder 270, and the distal end side of the long hole 262 a of the sleeve 260. When the sphere is sandwiched between the side surface (the right side surface in the figure), the plug 250 is prevented from being pulled out.
It should be noted that the overstroke region does not need to be provided in terms of design when the parts related to the lock mechanism and the lock confirmation mechanism have a dimensional tolerance of 0 and no deviation. Also, the backlash area can be eliminated.
However, in reality, it is impossible to manufacture parts with a dimensional tolerance of 0, and the lock position and the lock confirmation mechanism constituted by these parts also vary in the engagement position. This variation causes an overstroke region to be provided in the design without intention, and also causes a backlash region.

  When the plug 250 is removed from the socket 240, the outer cylinder 270 as a lock release mechanism is pushed in, so that the ball 276 moves radially outward in the recess 271b provided at the tip of the outer cylinder 270. Therefore, the plug 250 can be pulled out from the socket 240. Further, the pipe joint 200 is provided with a stopper member 200a for preventing the movement of the outer cylinder 270 in order to prevent the outer cylinder 270 from being accidentally pushed and the plug 250 from falling off the socket 240 in the locked state. Yes.

  Further, in the pipe joint 300 described in Patent Document 2, as shown in FIG. 17, an annular recess 313 a is formed on the inner peripheral surface on the distal end side of the socket 310, and the annular recess 313 a has a circumferential direction. A plurality of spheres 316 arranged at equal intervals and a coil spring 314 that urges the sphere 316 toward the distal end side and radially inward via an annular collar member 315 are arranged.

  A part of a substantially cylindrical sleeve 330 is inserted into the socket 310 from the tip side so as to close the inner peripheral side of the annular recess 313a. In the insertion portion of the sleeve 330, a long hole 331 having a width shorter than the diameter of the sphere 316 is formed so as to extend in the axial direction corresponding to each sphere 316. The sleeve 330 is held in a state where a part of the sleeve 330 protrudes through the long hole 331. A non-insertion portion of the sleeve 330 is formed with a circumferential groove 335 for lock confirmation. At two positions of the circumferential groove 335 for lock confirmation, which are separated by about 180 degrees from the central angle, the circumferential groove 335 is formed. The bottom portion passes through the outer wall of the sleeve 330 and communicates with the inner peripheral surface.

  Further, a substantially U-shaped lock confirmation member 336 is attached in a state of being fitted in the circumferential groove 335 for confirming the lock of the sleeve 330. In the state of FIGS. 17A and 17B, the lock confirmation member 336 does not protrude from the penetrating portion formed in the circumferential groove 335 to the inner peripheral surface side of the sleeve 330, but the lock confirmation member 336 is not shown in FIG. ) To the lock confirmation position, a part of the lock confirmation member 336 protrudes radially inward from the inner peripheral surface of the sleeve 330 through the penetration portion.

  The plug 320 includes a small diameter portion 321 inserted into the seal member 312 b and a large diameter portion 323 having a larger diameter than the small diameter portion 321 and an outer diameter substantially equal to the inner diameter of the sleeve 330. The small diameter part 321 and the large diameter part 323 are continuous by the inclined surface of the inclined part 322. The large-diameter portion 323 is formed with an annular recess 323a into which the sphere 316 is fitted adjacent to the inclined portion 322, and is further spaced apart from the annular recess 323a in the axial direction to form a peripheral groove 323b for lock confirmation. Has been.

  In this pipe joint 300, as shown in FIGS. 17A and 17B, when the plug 320 is inserted into the sleeve 330, the ball 316 that contacts the inclined portion 322 is deformed by the inclined portion 322 into the annular recess 313 a. Within and radially outward. When the plug 320 is further inserted, the ball 316 gets over the inclined portion 322 and fits into the annular recess 323a (FIG. 17C). As a result, the plug 320 is fixed to the socket 310.

  The pipe joint 300 is provided with an overstroke region in which the plug 320 can be further pushed from the locked state. In the overstroke region, the inclined portion 322 comes into contact with the small diameter limiting portion 334 formed at the distal end portion of the sleeve 330, thereby preventing further insertion of the plug 320. When the plug 320 is pulled so as to be pulled out from the locked state, a ball is formed between the side surface of the annular recess 323a of the plug 320 (the left side surface in the drawing) and the side surface of the annular recess 313a of the socket 310 (the right side surface in the drawing). When 316 is sandwiched, the plug 320 is prevented from being pulled out. When the plug 320 is removed from the socket 310, the ball 330 is pushed into the annular recess 313a by pushing the sleeve 330 serving as the unlocking mechanism toward the socket 310, so that the plug 320 can be pulled out from the socket 310. it can.

  Further, as shown in FIG. 17C, in this pipe joint 300, when the plug 320 is locked to the socket 310, the axial positions of the circumferential groove 335 of the sleeve 330 and the circumferential groove 323b of the plug 320 coincide. Therefore, the lock confirmation member 336 can be inserted up to the lock confirmation position of the circumferential groove 335 of the sleeve 330, and thus the locked state can be confirmed.

Japanese Patent Laid-Open No. 2003-254486 Japanese Patent Laid-Open No. 2006-38070

  However, in general, pipe joints are designed to absorb dimensional variations of related parts by providing an overstroke area and a backlash area as described above, and manufacturing dimensions have a predetermined dimensional error or manufacturing tolerance. Is allowed. For this reason, in the pipe joint of Patent Document 1, when the plug 250 is in the position immediately before locking (FIG. 15A), and when the plug 250 is in the backlash region (FIG. 16B), it appears in appearance. Indistinguishable. As a result, the user may misunderstand that the state in which the plug 250 is in the position immediately before locking is the state in which the plug 250 is in the backlash region.

  Moreover, in the pipe joint of patent document 2, although the lock confirmation member 336 is provided so that a user can confirm a locked state, as shown in FIG.17 (b), the lock confirmation in the circumferential groove 335 is confirmed. Due to backlash of the member 336 and manufacturing errors of the peripheral groove 323b on the plug 320 side, the lock confirmation member 336 can be inserted into the peripheral groove 323b of the plug 320 immediately before locking, that is, before the ball 316 gets over the inclined portion 322. There was a case. For this reason, even in the unlocked state, if the lock confirmation member 336 is inserted into the circumferential groove 323b of the plug 320, the user may be mistaken for being locked.

  Thus, in the conventional pipe joint, although it is not in the locked state, it may be mistaken for the locked state in appearance, and if the pipe joint is used in such an unlocked state, When an external force is applied to the plug so that it can be removed from the socket due to water pressure, there is a problem that the plug comes out and leaks water. At this time, there is a problem that the lock confirmation member and the sleeve are damaged.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a pipe joint capable of performing lock confirmation only when the plug is locked to the socket.

  In order to solve the above-described problems, the present invention provides a plug having a flow path therein, a socket into which the plug is inserted, a lock mechanism for locking the plug with respect to the socket, and the plug to the socket by the lock mechanism. And a lock confirmation mechanism for confirming that the plug is locked against the socket when the plug is inserted to the lock start position of the socket. The lock mechanism is locked in the overstroke area between the lock start position and the overstroke position where it can be further inserted in the insertion direction by a predetermined distance. The lock mechanism is locked to the socket. In this state, the plug can be moved a predetermined distance from the lock start position in the direction opposite to the insertion direction. The lock confirmation mechanism further includes a lash region, and an engagement portion whose position in the insertion direction is regulated with respect to the socket and movable inward in the radial direction of the socket, and an engaged portion provided in the plug And the engaging portion moves toward the inner side in the radial direction of the socket and engages with the engaged portion so that the lock of the plug can be confirmed, and the engaging portion and the engaged portion Is characterized in that it is positioned so that it does not engage when the plug is not inserted to the lock start position, and engages when the plug is inserted within the range from the lock start position to the overstroke position. .

  In the present invention configured as described above, the engagement portion of the lock confirmation mechanism is configured not to be engaged with the engaged portion unless the plug is inserted to the lock start position. With this configuration, if the plug is not fully inserted into the socket and the plug is not locked with respect to the socket but appears to be locked, the engaging portion of the lock confirmation mechanism is covered. It does not engage with the engaging part.

  That is, in general, in plugs and sockets having a backlash area, the plug is inserted into the lock start position and locked and then pulled back to the backlash area, or the plug is not inserted into the lock start position and is apparently locked. I can't judge what it looks like. However, in the present invention, the plug can be securely locked to the socket by the lock mechanism by inserting the plug to a state where the lock can be confirmed by the lock confirmation mechanism. Therefore, it is possible to prevent the user from misidentifying that the plug is in the backlash region even though the plug is not completely locked.

  Therefore, in the present invention, the user can grasp that the plug is securely locked to the socket by the lock mechanism by using the lock confirmation mechanism. As a result, it is possible to prevent the plug from failing to be locked with respect to the socket, and it is possible to prevent water pressure or the like from being applied to the plug and causing water leakage or damage to the plug and the socket. .

  In the present invention, preferably, the engaging portion and the engaged portion are positioned so as to engage with each other only when the plug is inserted to the overstroke region beyond the lock start position.

  In the present invention configured as described above, the engaging portion is configured to engage with the engaged portion only in the overstroke region. As a result, the engaging portion engages with the engaged portion before the plug is inserted into the lock start position due to a dimensional variation due to manufacturing tolerances, etc., that is, before the plug is locked to the socket by the lock function. It can be prevented from becoming possible.

  In the present invention, it is preferable that the lock mechanism further includes a lock release mechanism for performing a lock release operation, and the lock confirmation mechanism has at least the engagement portion and the engaged portion engaged, or the plug is connected to the socket. A cover member that covers the lock release mechanism so as to prevent the lock release operation by the lock release mechanism from being performed in the locked state.

  In the present invention configured as described above, the lock release mechanism is covered by the cover member of the lock confirmation mechanism in a state where the engaging portion and the engaged portion are engaged, so that the lock is erroneously released. This can be prevented.

  Preferably, in the present invention, the lock confirmation mechanism is configured such that when an external force is applied in a direction in which the plug is pulled out from the socket in a state where the plug is locked with respect to the socket, And a buffer portion for reducing the force applied to the.

  In the present invention configured as above, even if a large external force is generated in the direction of pulling out the plug due to water pressure or the like, the force transmitted from the plug side to the socket side is reduced by the buffer portion, so that the pipe joint is damaged. Can be prevented.

  In the present invention, it is preferable that the buffer portion includes urging means for urging the engaging portion in the plug insertion direction and positioning the insertion direction position of the engagement portion with respect to the socket.

  In the present invention configured as described above, the function of positioning the engaging portion in the inserting direction and the force transmitted from the plug side to the socket side are alleviated by urging the engaging portion in the inserting direction by the buffer portion. It can also serve as a function.

  According to the pipe joint of the present invention, it is possible to perform lock confirmation only in a state where the plug is locked to the socket.

1 is an overall view of a pipe joint in a first embodiment of the present invention. It is sectional drawing of the sleeve in 1st Embodiment of this invention. It is the III-III arrow line view of FIG. It is explanatory drawing of the lock confirmation member in 1st Embodiment of this invention. It is explanatory drawing of the biasing member in 1st Embodiment of this invention. It is operation | movement explanatory drawing of the pipe joint in 1st Embodiment of this invention. It is sectional drawing of the pipe joint in 2nd Embodiment of this invention. It is explanatory drawing of the cover member in 2nd Embodiment of this invention. It is sectional drawing of the cover member in 2nd Embodiment of this invention. It is operation | movement explanatory drawing of the pipe joint in 2nd Embodiment of this invention. It is sectional drawing of the pipe joint in 3rd Embodiment of this invention. It is explanatory drawing of the lock confirmation member in 3rd Embodiment of this invention. It is explanatory drawing of the biasing member in 3rd Embodiment of this invention. It is operation | movement explanatory drawing of the pipe joint in 3rd Embodiment of this invention. It is operation | movement explanatory drawing of the pipe joint which concerns on a prior art. It is operation | movement explanatory drawing of the pipe joint which concerns on a prior art. It is operation | movement explanatory drawing of the pipe joint which concerns on a prior art.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
A pipe joint according to a first embodiment of the present invention will be described with reference to FIGS. 1 is an overall view of a pipe joint, FIG. 2 is a sectional view of a sleeve, FIG. 3 is a view taken along the line III-III in FIG. 1, FIG. 4 is an explanatory view of a lock confirmation member, FIG. FIG. 6 is an explanatory view of the operation of the pipe joint.

  The pipe joint 1 according to the first embodiment is the same as the pipe joint according to the prior art shown in FIG. 17 and the basic configurations of the socket, sleeve and plug. As shown in FIG. 1, the pipe joint 1 by 1st Embodiment is provided with the socket 10 which has the internal thread part 11 screwed together to piping which is not shown in figure, and the plug 20 inserted in the socket 10 and locked. A through passage is formed in the socket 10 and the plug 20, and a continuous flow path is formed by locking these together.

  The socket 10 is a substantially cylindrical member, and has an internal thread portion 11, a small diameter portion 12 formed adjacent to the internal thread portion 11, and a large diameter portion 13 having an inner diameter larger than that of the small diameter portion 12. It has. The small-diameter portion 12 is formed with an inner circumferential groove 12a in which an O-ring 12b as a sealing member is disposed. The large-diameter portion 13 is formed with an annular recess 13a. The annular recess 13a is formed by a bottom portion and inclined surfaces extending from both sides of the bottom portion in the axial direction.

  The large-diameter portion 13 has a coil spring 14 as an urging member, a ring-shaped collar member 15 attached to the tip of the coil spring 14, and is biased in the distal direction and the inner diameter direction by the coil spring 14 via the collar member 15. A plurality of spheres 16 (four in this example) are arranged. The proximal end portion of the coil spring 14 is in contact with a step portion formed between the large diameter portion 13 and the small diameter portion 12.

  A part of a substantially cylindrical sleeve 30 is inserted and attached to the large diameter portion 13 side of the socket 10. As shown in FIG. 2, the sleeve 30 is formed such that the inner diameter of the inner peripheral surface is constant over the axial direction except for the distal end side (left side in the figure) and the proximal end side (right side in the figure). The outer diameter of the sleeve 30 is such that the distal end portion 30a has a small diameter, the proximal end portion 30c has a large diameter, and the intermediate portion 30b has an intermediate size. The outer dimension of the intermediate portion 30 b substantially matches the inner diameter of the opening portion on the large diameter portion 13 side of the socket 10.

  In the sleeve 30, corresponding to each sphere 16, long holes 31 are formed so as to extend in the axial direction at four locations in the circumferential direction of the small-diameter tip portion 30 a. The long hole 31 is formed so that the width (the length in the circumferential direction) is smaller than the diameter of the sphere 16. Accordingly, the sphere 16 does not fall into the sleeve 30 through the long hole 31, and a part of the sphere 16 protrudes radially inward from the inner peripheral surface of the sleeve 30 as shown in FIG.

In addition, one slit 32 is formed between the adjacent long holes 31 from the distal end portion 30a to the intermediate portion 30b so as to extend in the axial direction.
A protruding portion 33 protruding radially outward adjacent to the long hole 31 and the slit 32 is separated in the circumferential direction by the slit 32 and the long hole 31 between the distal end portion 30 a and the intermediate portion 30 b of the sleeve 30. It is formed in 8 places in the state. The protrusion 33 is brought into contact with the inclined surface of the annular recess 13a of the socket 10, so that the movement in the insertion direction and the extraction direction is limited.

An annular portion 34 that connects the adjacent long hole 31 and the slit 32 is formed on the inner peripheral surface of the distal end portion 30a of the sleeve 30 so as to protrude radially inward. Therefore, the annular portion 34 has the smallest inner diameter dimension on the inner peripheral surface of the sleeve 30.
Further, a circumferential groove 35 is formed in the proximal end portion 30 c of the sleeve 30. In the circumferential groove 35, through portions 35a penetrating the inner circumferential surface are formed at two positions separated by 180 degrees in the circumferential direction.

A plate-like lock confirmation member 36 formed in a substantially U shape as shown in FIG. 4 and an urging member 37 shown in FIG. 5 are inserted into the circumferential groove 35.
The lock confirmation member 36 includes two leg portions 36a and a connecting portion 36b that connects them. A recess 36c is formed in the leg portion 36a so as to be substantially along the inner peripheral surface of the sleeve 30 indicated by an imaginary line. Therefore, at the position (insertion operation position A) where the concave portion 36c of the lock confirmation member 36 coincides with the inner peripheral surface of the sleeve 30, the leg portion 36a does not appear on the inner peripheral side of the sleeve 30, but the lock confirmation member 36 is inserted. At a position inserted into the circumferential groove 35 rather than the position (lock confirmation position B), the leg portion 36a as the engaging portion moves substantially radially inward and appears on the inner peripheral side of the sleeve 30.
The biasing member 37 is a member that functions as a substantially annular leaf spring as shown in FIG.

By arranging the lock confirmation member 36 and the urging member 37 in the circumferential groove 35, the urging member 37 uses the reference surface 36 d (the left surface in FIG. 1) of the lock confirmation member 36 as the reference wall 35 b of the circumferential groove 35. It is held in a state of being pressed against (the wall portion along the radial direction located on the left side in FIG. 2). Accordingly, the lock confirmation member 36 is accurately positioned in the axial direction without rattling in the circumferential groove 35.
The lock confirmation member 36 is disposed so as to be pressed against the left side wall portion of the circumferential groove 35.

  The plug 20 has a small diameter portion 21 having substantially the same outer diameter as the inner diameter of the small diameter portion 12 of the socket 10 and a large diameter portion having a diameter larger than that of the small diameter portion 21 and substantially the same outer diameter as the inner peripheral surface of the sleeve 30. 23, and an inclined portion 22 having an inclined surface connecting the small diameter portion 21 and the large diameter portion 23. The large diameter portion 23 is connected to the fluid piping main body.

  An annular recess 23 a is formed in the large diameter portion 23 adjacent to the inclined portion 22. The plug 20 is connected to the socket 10 by fitting the ball 16 into the annular recess 23a. The large-diameter portion 23 has a lock confirmation peripheral groove 23b into which the lock confirmation member 36 is fitted closer to the pipe body than the annular recess 23a. A wall portion extending in the radial direction on the annular recess 23a side of the circumferential groove 23b as the engaged portion is formed as a reference wall 23c positioned as described later.

Next, the operation of the pipe joint 1 according to the first embodiment of the present invention will be described with reference to FIG.
FIG. 6A shows a state where the plug 20 is inserted into the socket 10 from the distal end side, and the inclined portion 22 of the plug 20 is in contact with the ball 16.

  When the plug 20 is further pushed into the socket 10 from FIG. 6A, the inclined portion 22 resists the urging force of the coil spring 14 and moves the ball 16 radially outward within the annular recess 13a (FIG. 6). (B)). In FIG. 6B, the sphere 16 reaches the top of the inclined portion 22. At this time, since the plug 20 has not reached the lock start position O, the reference surface 36d of the lock confirmation member 36 is positioned on the front side (left side in FIG. 6) of the reference wall 23c of the circumferential groove 23b of the plug 20. . Therefore, even if the lock confirmation member 36 is pushed in this state, the leg portion 36a comes into contact with the large diameter portion 23 of the plug 20, and the lock confirmation member 36 cannot be inserted to the lock confirmation position (x1> 0). That is, in the state immediately before locking shown in FIG. 6B, the plug 20 is positioned in front of the locking start position O by the distance x1.

  FIG. 6 (c) shows a state where the ball 16 has passed over the inclined portion 22 by further pushing the plug 20 to the lock start position O. At this time, the ball 16 moves to the right side in the annular recess 13 a by the urging force of the coil spring 14 and falls into the annular recess 23 a of the plug 20. Thereby, the plug 20 is locked with respect to the socket 10 by the lock mechanism which consists of the socket 10, the sleeve 30, the ball | bowl 16, the annular recessed part 23a of the plug 20, etc. in the lock start position O.

  In this embodiment, when the plug 20 is inserted to the lock start position O, the reference wall 23c of the circumferential groove 23b of the plug 20 and the reference wall 35b of the circumferential groove 35 of the sleeve 30 coincide in the axial direction (insertion direction). It is formed so as to be positioned. Further, since the lock confirmation member 36 is pressed against the reference wall 35 b by the urging member 37, the reference surface 36 d of the lock confirmation member 36 coincides with the reference wall 35 b of the sleeve 30 and the reference wall 23 c of the plug 20.

  Thereby, as shown in FIG.6 (c), in the lock start position O, it becomes possible to insert the lock confirmation member 36 to a lock confirmation position, and the user can confirm a locked state. That is, in the present embodiment, the lock confirmation member 36 cannot be inserted to the lock confirmation position until the plug 20 reaches the lock start position O (and therefore is locked). Thereby, in this embodiment, before locking, it can prevent that a user mistakenly recognizes that it is in a locked state.

  The pipe joint 1 of the present embodiment has an overstroke region where the plug 20 is further pushed in the insertion direction from the state of FIG. That is, in the locked state, the plug 20 can be further pushed in from the state of FIG. 6C until the inclined portion 22 contacts the annular portion 34 of the sleeve 30.

  In the present embodiment, the inclined surfaces of the annular recesses 13a and 23a that sandwich the ball 16 in the locked state are configured to be parallel, so that the ball 16 is in the annular recess 23a of the plug 20 at the lock start position O. Between the inclined surface and the inclined surface of the annular recess 13 a of the socket 10. Accordingly, once the locked state is reached, the plug 20 cannot be moved in the direction of pulling out. That is, when all the lock mechanisms are configured with parts having a manufacturing tolerance of 0, the pipe joint 1 of the present embodiment does not have a backlash region. However, as described above, a backlash region occurs when manufacturing tolerances exist.

  Moreover, you may provide a backlash area | region by forming the relationship of the inclined surface of the annular recessed parts 13a and 23a so that it may expand toward the right side in a figure, for example. Moreover, you may form so that it may expand toward the left side in a figure. Thus, even when the backlash region is provided, the manufacturing tolerance is set so that the lock confirmation member 36 can be inserted into the circumferential groove 23b of the plug 20 when the plug 20 is pushed to the lock start position O. The axial position of the reference wall 23c of the circumferential groove 23b and the reference wall 35b of the circumferential groove 35 may be set in consideration of the backlash amount due to the above.

  FIG. 6D shows a modification. In this example, when the plug 20 is inserted to the maximum overstroke position, the lock confirmation member 36 is formed so as to be inserted into the circumferential groove 23b. That is, the lock confirmation member 36 can be inserted to the lock confirmation position for the first time at a position where the plug 20 is pushed further by the distance x2 than the lock start position O. The distance x2 is preferably set to an amount that absorbs the variation in the engagement position due to the dimensional tolerance. In this example, the lock can be confirmed at the maximum overstroke position. However, the present invention is not limited to this, and the lock can be confirmed between the lock start position O and the maximum overstroke position.

  In the case where the lock can be confirmed at the lock start position O as shown in FIG. 6C, the reference wall 35b and the reference wall 23c are slightly in the axial direction at the lock start position O in consideration of the manufacturing tolerance. There is a risk of shifting. For this reason, even if the lock confirmation member 36 is urged by the urging member 37 to specify the axial position, the lock confirmation member 36 is inserted to the lock confirmation position before the plug 20 reaches the lock start position O. May become possible.

  However, as shown in FIG. 6D, in consideration of manufacturing tolerances, if the lock can be confirmed in the overstroke region, the lock can be confirmed only after the locked state is reliably established. be able to.

  Further, in this embodiment, when an external force due to water pressure or water hammer is applied to the plug 20 in the direction of pulling out the plug 20, this external force is transmitted to the sleeve 30 via the lock confirmation member 36. In the present embodiment, since the urging member 37 is interposed between the lock confirmation member 36 and the sleeve 30, the sleeve 30 (accurately from the lock confirmation member 36 due to the buffering action of the urging member 37 as a buffer portion. The force is not directly transmitted to the side wall of the circumferential groove 35. For this reason, damage to the sleeve 30 and the plug 20 can be prevented.

  In addition, in this embodiment, although the leg part 36a of the lock confirmation member 36 as an engaging part fits in the circumferential groove 23b of the plug 20 as an engaged part, it is not restricted to this, The following Similarly, in the embodiment, the engaged portion may be fitted into the engaging portion. For example, a recess may be provided in the leg portion 36a, and a protrusion that engages with the recess may be provided in place of the circumferential groove 23b.

Next, with reference to FIG. 7 thru | or FIG. 10, the pipe joint of 2nd Embodiment of this invention is demonstrated. 7 is a sectional view of the pipe joint, FIG. 8 is an explanatory view of the cover member, FIG. 9 is a sectional view of the cover member, and FIG. 10 is an operation explanatory view of the pipe joint.
The pipe joint 2 according to the second embodiment is the same as the pipe joint according to the prior art shown in FIG. 15 with respect to the basic configuration of the socket, sleeve, outer cylinder, and plug, and therefore redundant description is omitted. As shown in FIG. 7, the pipe joint 2 according to the second embodiment includes a socket 40 having a female screw portion 41 and a plug 50 inserted into the socket 40 and locked.

  The socket 40 is a substantially cylindrical member, and includes an internal thread portion 41 and a small diameter portion 42 formed on the end side opposite to the internal thread portion 41 on the inner peripheral surface. The small diameter portion 42 is formed with an inner circumferential groove 42a in which the O-ring 42b is disposed.

  A cylindrical sleeve 60 is fitted and fixed to the socket 40 so as to cover the small diameter portion 42 from the outside. The sleeve 60 includes a press-fit fitting portion 61 that covers the small diameter portion 42 and an extending portion 62 that protrudes from the press-fit fitting portion 61 to the right side in FIG. The extension portion 62 has a smaller outer diameter than the press-fit fitting portion 61, and the sleeve 60 is formed in a stepped shape as a whole.

  A substantially cylindrical outer cylinder 70 is attached to the sleeve 60 so as to be movable in the axial direction. An annular convex portion 71 that protrudes radially inward from the inner peripheral surface is formed near the right end portion in FIG. 7 of the outer cylinder 70. Due to the annular protrusion 71, an annular recess 71a is formed on the left side in the drawing with respect to the sleeve 60, and an annular recess 71b is formed on the right side of the annular projection 71 in the drawing with respect to the sleeve 60. The

  The annular recess 71 a has a coil spring 74, a ring-shaped collar member 75 attached to the tip of the coil spring 74, and a plurality of spheres 76 that are biased by the coil spring 74 through the collar member 75 in the tip direction and the inner diameter direction. (4 in this example) are arranged. A proximal end portion of the coil spring 74 is in contact with a step portion formed in the press-fitting fitting portion 61 of the sleeve 60.

  In the extending portion 62 of the sleeve 60, elongated holes 62 a extending in the axial direction are formed at four locations in the circumferential direction corresponding to the respective spheres 76. The long hole 62 a is formed so that the width (length in the circumferential direction) is smaller than the diameter of the sphere 76. Therefore, the sphere 76 does not fall into the sleeve 60 through the long hole 62 a, and a part of the sphere 76 protrudes radially inward from the inner peripheral surface of the sleeve 60.

  Further, the extending portion 62 of the sleeve 60 is formed such that the inner diameter of the inner peripheral surface is constant over the axial direction except for the end portion on the press-fitting fitting portion 61 side. Of the inner peripheral surface of the extending portion 62, a limiting portion 64 protruding inward in the radial direction is formed at an end portion on the press-fitting fitting portion 61 side.

  The plug 50 has a small-diameter portion 51 having substantially the same diameter as the small-diameter portion 42 of the socket 40 and a larger outer diameter than the small-diameter portion 51, and has substantially the same outer diameter as the inner peripheral surface of the extension portion 62 of the sleeve 60. A large-diameter portion 53 and an inclined portion 52 having an inclined surface connecting the small-diameter portion 51 and the large-diameter portion 53 are provided.

  An annular recess 53 a is formed in the large diameter portion 53 adjacent to the inclined portion 52. The large-diameter portion 53 is formed with a circumferential groove 53b as an engaged portion for lock confirmation into which lock confirmation members 82a and 85a as engagement portions are fitted closer to the pipe body than the annular recess 53a. Yes. A wall portion extending in the radial direction on the left side in FIG. 7 of the circumferential groove 53b is formed as a positioned reference wall 53c.

  Furthermore, the pipe joint 2 of the present embodiment includes a substantially cylindrical cover member 80 made of a resin that covers the periphery of the outer cylinder 70. The cover member 80 includes two semi-cylindrical members 81 and 84 as shown in FIG. The semi-cylindrical members 81 and 84 are supported by the hinge portion 80a so as to be able to be opened and closed, and can be locked by opening and closing lock members 80b and 80c respectively provided in a completely closed state.

  When the cover member 80 is locked by the open / close lock members 80b and 80c, the outer cylinder 70 serving as an unlocking mechanism is covered so that the outer cylinder 70 cannot be moved in the release direction by mistake.

  As shown in FIG. 9, the semi-cylindrical members 81 and 84 have a space for accommodating the combined body of the plug 50 and the socket 40 therein, and have semicircular top portions 82 and 85 and a bottom portion located on the opposite side thereof. 83 and 86 are formed with openings for allowing the plug 50 and the socket 40 to pass therethrough, respectively.

  Lock confirmation members 82a and 85a are formed on the top portions 82 and 85. The lock confirmation members 82a and 85a are brought into contact with the annular front end surface 60a of the sleeve 60 and fitted into the circumferential groove 53b of the plug 50 with the semicylindrical members 81 and 84 closed. ing.

  As shown in FIG. 7, the lock confirmation members 82a and 85a form a semicircular opening having an inner diameter substantially the same as the outer diameter of the circumferential groove 53b of the plug 50 in the closed state. Of the surfaces facing the axial direction formed by the lock confirmation members 82a and 85a, the annular surfaces 82b and 85b formed on the socket 40 side are positioned with respect to the lock start position O as described later.

Further, urging members 83a and 86a that are curved and extended from the bottoms 83 and 86 to the top side are integrally formed on the bottoms 83 and 86, respectively. The urging members 83a and 86a are configured to be in elastic contact with the sleeve 60 at a flange portion 60b positioned opposite to the distal end surface 60a in the closed state. Therefore, when the urging members 83a and 86a come into contact with the flange portion 60b, the annular surfaces 82b and 85b are pressed toward the distal end surface 60a of the sleeve 60, whereby the axial positions of the annular surfaces 82b and 85b are positioned. Is done.
In the present embodiment, the urging members 83a and 86a are integrally formed with the semi-cylindrical members 81 and 84. However, the urging member, which is a separate member such as a leaf spring, is not limited thereto. It is good also as a structure assembled | attached to the shaped members 81 and 84.

Next, the operation of the pipe joint 2 according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 10 (a) shows a state immediately before the plug 50 is inserted into the socket 40 and the ball 76 gets over the inclined portion 52, that is, immediately before locking, which corresponds to the state of FIG. 15 (a) of the prior art. To do. Therefore, the plug 50 is not inserted up to the lock start position O, and is positioned in front of the lock start position O by a distance x3.

  In the present embodiment, when the plug 50 is positioned at the lock start position O, the axial position of the distal end surface 60a of the sleeve 60 and the axial position of the reference wall 53c of the circumferential groove 53b of the plug 50 coincide with each other. The reference wall 53c of the circumferential groove 53b of the plug 50 is positioned with respect to the distal end surface 60a of the sleeve 60. Therefore, in the state of FIG. 10A, even if the cover member 80 is to be closed, the annular surfaces 82b and 85b are in the same axial position as the distal end surface 60a of the sleeve 60, so that the lock confirmation members 82a and 85a are connected to the plug 50. Cannot be fitted into the circumferential groove 53b.

  FIG. 10B shows a state in which the plug 50 is inserted from the state of FIG. 10A to the lock start position O, and corresponds to the state of FIG. 15C of the prior art. In this state, the sphere 76 is fitted into the annular recess 53a, and the plug 50 is locked to the socket 40 by a lock mechanism including the socket 40, the sleeve 60, the sphere 76, the annular recess 53a of the plug 50, and the like.

  At this time, the axial position of the front end surface 60a of the sleeve 60 and the annular surfaces 82b and 85b coincides with the axial position of the reference wall 53c of the circumferential groove 53b of the plug 50. Therefore, in the state of FIG. 10B, when the cover member 80 is to be closed, the lock confirmation members 82a and 85a are fitted into the circumferential groove 53b of the plug 50, and the semi-cylindrical members 81 and 84 are completely closed. Can do.

  Since the position in FIG. 10A is indistinguishable from the backlash area as described with reference to the prior art, the user may misunderstand that the plug 50 is locked. However, in the pipe joint 2 of this embodiment, in the backlash region, the lock confirmation members 82a and 85a cannot be structurally fitted into the circumferential groove 53b, so that the semicylindrical members 81 and 84 are completely closed. I can't. Therefore, in this embodiment, the user can confirm that the plug 50 is completely locked with respect to the socket 40 by whether or not the cover member 80 can be completely closed.

Further, in the present embodiment, when an external force is applied in the direction in which the plug 50 is pulled out, the external force is transmitted to the sleeve 60 via the lock confirmation members 82a and 85a. In the present embodiment, biasing members 83a and 86a are interposed between the lock confirmation members 82a and 85a and the sleeve 60, and the plug 50 of the lock confirmation members 82a and 85a is elastically deformed by the biasing members 83a and 86a. It is possible to move a predetermined distance in the drawing direction (right direction in FIG. 10B). This distance is preferably greater than or equal to the distance from the position where the lock confirmation members 82a and 85a can be inserted to the lock confirmation position to the longest position of the backlash region (the right end position in FIG. 10B).
By doing so, the lock confirmation members 82a and 85a can follow the movement of the circumferential groove 53b which is a part of the plug 50, and the lock confirmation members 82a and 85a are directly connected to the sleeve 60 by the buffering action. That force is not transmitted. For this reason, damage to the sleeve 60 and the plug 50 can be reliably prevented.

  Further, the urging force of the urging members 83a and 86a is sufficiently larger than the sliding resistance between the sealing 0-ring (equivalent to 242b) and the plug 50, the sliding resistance between the socket 40 and the plug 50, and the urging force of the coil spring (equivalent to 274). Even if the lock confirmation members 82a and 85a are fitted in the circumferential grooves 53b by accidentally holding the cover member 80 and moving it in the direction of pulling out the plug before the lock is completed, the cover member The lock can be completed when the hand holding 80 is released.

  In the present embodiment, at the lock start position O, the axial position of the distal end surface 60a of the sleeve 60 and the axial position of the reference wall 53c of the circumferential groove 53b are formed to coincide with each other. Not limited to this, it is only necessary that the axial position of the reference wall 53c is positioned with respect to the axial position of the distal end surface 60a. Therefore, for example, at the lock start position O, the reference wall 53c may be positioned on the right side in the drawing by a predetermined distance in the axial direction with respect to the tip surface 60a.

  Further, in the present embodiment, when the plug 50 is located at the lock start position O, the axial position of the distal end surface 60a of the sleeve 60 and the axial position of the reference wall 53c of the circumferential groove 53b are formed to coincide with each other. However, the present invention is not limited to this, and in order to absorb component tolerances and further improve the reliability of lock confirmation, when the plug 50 is located in the overstroke region, the axial position of the tip surface 60a and the reference You may comprise so that the axial direction position of the wall 53c may correspond.

Next, with reference to FIG. 11 thru | or FIG. 14, the pipe joint of 3rd Embodiment of this invention is demonstrated. 11 is a cross-sectional view of a pipe joint, FIG. 12 is an explanatory view of a lock confirmation member, FIG. 13 is an explanatory view of an urging member, and FIG. 14 is an operation explanatory view of the pipe joint.
The pipe joint 3 according to the third embodiment has a structure similar to that of the pipe joint 2 according to the second embodiment. That is, the socket 40, the plug 50, and the outer cylinder 70 are the same. Since the basic structure of the sleeve 160 and the cover member 180 is the same as that of the second embodiment, only the differences will be described below.

  As shown in FIGS. 11 and 14, the sleeve 160 of the present embodiment includes a holding portion 161 from a part of the tip surface 160 a corresponding to the tip surface 60 a of the second embodiment toward the pipe main body side (right side in FIG. 11). Is provided to extend.

  The holding part 161 has a ring-like shape connecting the extension part 162 extending from the part of a predetermined angle range separated by 180 degrees at the central angle toward the tip by a predetermined length and the tip parts of the two extension parts 162. And an annular portion 163. The inner diameters of the extension portion 162 and the annular portion 163 are set to be approximately the same as the outer diameter size of the large diameter portion 53 of the plug 50.

A lock confirmation member 166 shown in FIG. 12 and an urging member 169 shown in FIG. 13 are attached to the holding portion 161 and the extension portion 162.
The lock confirmation member 166 includes two substantially sector-shaped lock members 167 having a predetermined thickness and a central angle of about 130 degrees, and a coupling portion 168 that elastically connects them. In a state where no external force is applied, the two lock members 167 form a space through which the large-diameter portion 53 of the plug 50 can pass between the recesses 167b (see FIG. 14A). Further, the lock member 167 can be moved in a direction approaching each other by the coupling portion 168.

  The lock member 167 includes a plate-shaped main body portion 167a formed in a substantially sector shape, a recess portion 167b having a curvature radius substantially the same as the outer diameter of the circumferential groove 53b of the plug 50, and notch portions 167c formed on both sides thereof. And a flange portion 167d extending in the axial direction (a direction substantially perpendicular to the main body portion) from the circumferential edge portion of the main body portion 167a. The recess 167b has a curved surface that is notched when a circle having the outer diameter of the circumferential groove 53b is drawn at the center of the sector. In addition, the notch 167c allows the extension 162 to pass between the lock members 167 with the two recesses 167b sandwiching the circumferential groove 53b so that the extension 162 does not interfere with the lock member 167. (See FIG. 14B).

  The urging member 169 is made of, for example, a metal material so as to function as a leaf spring, and extends radially outward from the ring portion 169a and four portions spaced 90 degrees from each other in the circumferential direction of the ring portion 169a. After that, there is a presser portion 169b which is bent at a predetermined angle in the axial direction and extends about 60 degrees in the circumferential direction. The ring portion 169a may be partially cut in the circumferential direction so as to be easily attached.

  The lock confirmation member 166 sandwiches the extended portion 162 of the sleeve 160 between the two lock members 167 so that the reference surface 167e, which is one surface of the lock member 167, contacts the distal end surface 160a of the sleeve 160, It is arranged on the holding part 161. On the other hand, the urging member 169 penetrates the extended portion 162 of the sleeve 160 into the ring portion 169a, makes the ring portion 169a contact the annular portion 163 in the axial direction, and holds the lock member 167 on the socket 40 side by the holding portion 169b. It arrange | positions at the holding | maintenance part 161 so that it may urge.

  With this arrangement, the reference surface 167e of the lock member 167 is positioned in the axial direction with respect to the distal end surface 160a of the sleeve 160. In this state, the lock confirmation member 166 can move the lock member 167 elastically in the radial direction.

  The cover member 180 is formed of two semi-cylindrical members 181 and 184 as in the second embodiment. The cover member 180 has openings at the top and bottom so that the socket 40, the sleeve 160, the outer cylinder 70, and the plug 50 can pass through when the semicylindrical members 181 and 184 are closed and locked by the open / close lock members 180a and 180b. It is formed. Further, the cover member 180 is configured so that the outer cylinder 70 cannot be moved in the release direction by mistake when the outer cylinder 70 is covered in the closed state.

  In the closed state, the cover member 180 forms a substantially circular space in plan view by the inner peripheral surfaces 181b and 184b of the peripheral walls 181a and 184a forming the semicylindrical members 181 and 184. The diameter of the substantially circular space is set to be approximately equal to the outer diameter of the circle formed by the flange portion 167d when the lock confirmation member 166 sandwiches the circumferential groove 53b of the plug 50. Therefore, the cover member 180 cannot be completely closed unless the lock confirmation member 166 is completely closed.

Next, the operation of the pipe joint 3 according to the third embodiment of the present invention will be described with reference to FIG.
When the plug 50 is inserted into the socket 40, the reference wall 53c of the circumferential groove 53b of the plug 50 is closer to the front side in the axial direction than the distal end surface 160a of the sleeve 160 before the plug 50 reaches the lock start position O. To position. Therefore, since the reference surface 167e of each lock member 167 of the lock confirmation member 166 coincides with the tip end surface 160a of the sleeve 160 in the axial direction, when the lock confirmation member 166 is to be closed, the recess 167b is formed in the plug 50. Since it abuts on the large-diameter portion 53, the lock confirmation member 166 cannot be completely closed (see FIG. 14A).

  If the lock confirmation member 166 is not completely closed, the inner peripheral surfaces 181b and 184b interfere with the flange portion 167d of the lock confirmation member 166 even if the cover member 180 is to be closed. Can not.

  On the other hand, when the plug 50 reaches the lock start position O, the reference wall 53c of the circumferential groove 53b of the plug 50 and the axial position of the front end surface 160a of the sleeve 160 coincide with each other. Therefore, the reference position 167e of each lock member 167 of the lock confirmation member 166 and the axial position of the reference wall 53c of the plug 50 coincide. Thereby, the lock confirmation member 166 can be completely closed, and the lock member 167 as the engaging portion can be fitted into the circumferential groove 53b as the engaged portion.

  If the lock member 167 can be fitted in the circumferential groove 53b, the lock confirmation member 166 can be completely closed, so that the inner peripheral surfaces 181b and 184b do not interfere with the flange portion 167d, and the cover member 180 can be completely closed.

  Also in the third embodiment, similarly to the second embodiment, in the backlash region, the lock confirmation member 166 cannot structurally fit into the circumferential groove 53b in the backlash region, so that the lock confirmation member 166 can be completely closed. Can not. Therefore, also in this embodiment, the user can confirm that the plug 50 is completely locked with respect to the socket 40 by whether or not the cover member 80 can be completely closed.

In the present embodiment, when an external force is applied in the direction in which the plug 50 is pulled out, the external force is transmitted to the sleeve 160 (precisely, the annular portion 163 of the sleeve 160) via the lock confirmation member 166. In this embodiment, an urging member 169 is interposed between the lock confirmation member 166 and the sleeve 160, and the plug 50 of the lock confirmation member 166 is pulled out by the elastic deformation of the urging member 169 (the right direction in FIG. 11). ) To a predetermined distance. This distance is preferably equal to or greater than the distance from the position where the lock confirmation member 166 can be inserted to the lock confirmation position to the longest position of the backlash region (the right end portion in FIG. 11).
In this way, the lock confirmation member 166 can follow the movement of the circumferential groove 53b which is a part of the plug 50, and the lock confirmation member 166 directly contacts the sleeve 160 by the buffering action. Shock is not transmitted. For this reason, damage to the sleeve 160 and the plug 50 can be reliably prevented.

  Further, the urging force of the urging member 169 is sufficiently larger than the sliding resistance between the sealing 0-ring (equivalent to 242b) and the plug 50, the sliding resistance between the socket 40 and the plug 50, and the urging force of the coil spring (equivalent to 274). If designed, the lock confirmation member 166 is held even when the lock confirmation member 166 is erroneously held in the direction of pulling out the plug before the lock is completed and the lock member 167 is fitted into the circumferential groove 53b. The lock can be completed when the hand is released.

  In this embodiment, the axial position of the front end surface 160a of the sleeve 160 and the axial position of the reference wall 53c of the circumferential groove 53b coincide with each other at the lock start position O. However, the axial position of the reference wall 53c only needs to be positioned with respect to the axial position of the distal end surface 160a. Therefore, for example, when the relationship where the reference wall 53c and the portion replacing the front end surface 160a coincide with each other at the lock start position O is configured such that they are positioned on the right side in FIG. 11 by a predetermined distance in the axial direction. Good.

  Further, in the present embodiment, when the plug 50 is positioned at the lock start position O, the axial position of the distal end surface 160a of the sleeve 160 and the axial position of the reference wall 53c of the circumferential groove 53b are formed to coincide with each other. However, the present invention is not limited to this, and when the plug 50 is positioned in the overstroke region, the axial position of the distal end surface 160a may be configured to coincide with the axial position of the reference wall 53c.

  In addition, the lock mechanism related to the present invention has been described with a lock mechanism using a sphere, but a lock mechanism that does not use a sphere, for example, a press-working component such as described in JP-A-2006-226532, The present invention can also be applied to a lock mechanism using cutting parts.

1, 2, 3, 200, 300 Pipe joint 10, 40, 240, 310 Socket 13a Annular recess 20, 50, 250, 320 Plug 22 Inclined portion 23a Annular recess 23b Circumferential groove 23c Reference walls 30, 60, 160, 260, 330 sleeve 35 circumferential groove 35b reference wall 36 lock confirmation member 36d reference surface 52 inclined portion 53a annular recess 53b circumferential groove 53c reference wall 60a tip surface 70 outer cylinder 71a annular recess 80 cover member 82a, 85a lock confirmation member 82b, 85b annular surface 160a Front end surface 161 Holding portion 166 Lock confirmation member 167e Reference surface 180 Cover member

Claims (5)

A plug having a flow path therein, a socket into which the plug is inserted, a lock mechanism for locking the plug with respect to the socket, and confirming that the plug is locked with respect to the socket by the lock mechanism And a lock confirmation mechanism for
The lock mechanism locks the plug with respect to the socket when the plug is inserted to the lock start position of the socket, and can be further inserted in the insertion direction by a predetermined distance beyond the lock start position. It is locked in the overstroke area up to the overstroke position,
The locking mechanism further includes a backlash region in which the plug can be moved by a predetermined distance in a direction opposite to the insertion direction from the lock starting position in a state where the plug is locked with respect to the socket.
The lock confirmation mechanism includes: an engaging portion whose position in the insertion direction is regulated with respect to the socket and movable inward in the radial direction of the socket; and an engaged portion provided in the plug. And the engagement portion is configured to be able to confirm the lock of the plug by moving toward the radially inner side of the socket and engaging with the engaged portion,
The engaging portion and the engaged portion are not engaged when the plug is not inserted to the lock start position, and when the plug is inserted within a range from the lock start position to the overstroke position. A pipe joint characterized by being positioned to engage.   The engagement portion and the engaged portion are positioned so as to engage with each other only when the plug is inserted to the overstroke region beyond the lock start position. Item 1. The pipe joint according to Item 1. The lock mechanism further includes a lock release mechanism for performing a lock release operation,
The lock confirmation mechanism prevents an unlocking operation from being performed by the unlocking mechanism when at least the engaging portion and the engaged portion are engaged or the plug is locked with respect to the socket. The pipe joint according to claim 1, further comprising a cover member that covers the lock release mechanism.   When the plug is locked with respect to the socket and an external force is applied in a direction in which the plug is pulled out of the socket, the lock confirmation mechanism is moved from the engaged portion to the engaging portion by the external force. The pipe joint according to any one of claims 1 to 3, further comprising a buffer portion that reduces applied force.   The said buffer part is provided with the urging means which urges | biases the said engaging part to a plug insertion direction, and positions the insertion direction position of the said engaging part with respect to the said socket. Pipe fittings.

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