JP5436157B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint including a male nose in which a flow path portion is formed and a female body.

  As a pipe joint between hoses for transferring a liquid such as beer, a pipe joint including a male nose in which a flow path portion is formed and a female body is known (see, for example, Patent Document 1). In the pipe joint described in Patent Document 1, the lock pin protruding from the outer peripheral surface of the body locks the movement of the cover attached to the outer peripheral side of the body to the pipe connecting portion side and to the pipe connecting portion side of the cover. It is possible to rotate in the circumferential direction between the unlocked position that allows the movement of

JP 2009-14166 A

  However, when an abnormal force is applied to the lock pin and the lock pin is broken, it is difficult to find the break of the lock pin, that is, damage to the pipe joint from the appearance of the pipe joint.

  The present invention has been made to solve the above problem, and an object of the present invention is to obtain a pipe joint that can be easily known from the appearance of the pipe joint that an abnormal force is applied to the lock pin and the pipe joint is damaged. It is.

  The pipe joint of the invention according to claim 1 is connected to the nose connected to the flow path end on one side and to the flow path end on the other side, and to the flow path end on the other side and the flow on the one side. A body into which the nose is inserted so as to communicate with a road end, a lock pin protruding from an outer peripheral surface of the body, and an outer peripheral side of a tip portion of the body movably attached in the axial direction of the body; The lock pin is rotatable in the circumferential direction of the body between a lock position where movement toward the pipe connection portion side is locked and a lock release position where movement toward the pipe connection portion side is allowed. And the strength against the bending load of the lock pin is set to a strength that does not break until the cover is deformed or broken by the bending load.

  In the pipe joint according to the first aspect, the strength against the bending load of the lock pin protruding from the outer peripheral surface of the body is set to a strength that does not break until the cover is deformed or broken by the bending load. For this reason, when an abnormal force is applied to the lock pin through the cover, the lock pin is not broken and the cover is deformed or damaged. For this reason, it can be easily known from the appearance of the pipe joint that the pipe joint has been damaged.

  According to a second aspect of the present invention, in the pipe joint according to the first aspect, the cross-sectional shape of the lock pin is a long shape whose longitudinal direction is the axial direction of the body.

  In the pipe joint according to claim 2, the cross-sectional shape of the lock pin is a long shape whose longitudinal direction is the axial direction of the body, and the strength against the bending load of the lock pin protruding from the outer peripheral surface of the body is The strength is set so as not to be broken until the cover is deformed or damaged by the load. For this reason, when an abnormal force is applied to the lock pin through the cover in the axial direction of the body, the lock pin is not broken and the cover is deformed or broken. For this reason, it can be easily known from the appearance of the pipe joint that the pipe joint has been damaged.

  According to a third aspect of the present invention, in the pipe joint according to the first or second aspect, the cross-sectional shape of the lock pin is an elliptical shape whose longitudinal direction is the axial direction of the body. .

  In the pipe joint according to claim 3, the cross-sectional shape of the lock pin is an elliptical shape whose longitudinal direction is the axial direction of the body, and the strength against the bending load of the lock pin protruding from the outer peripheral surface of the body is the bending load. Therefore, the cover is set to a strength that does not break until the cover is deformed or broken. For this reason, when an abnormal force is applied to the lock pin through the cover in the axial direction of the body, the lock pin is not broken and the cover is deformed or broken. For this reason, it can be easily known from the appearance of the pipe joint that the pipe joint has been damaged.

  As described above, the pipe joint according to the first aspect of the present invention can be easily known from the appearance of the pipe joint that an abnormal force is applied to the lock pin and the pipe joint is damaged.

  In the pipe joint according to the second aspect of the present invention, it can be easily known from the appearance of the pipe joint that an abnormal force is applied to the lock pin and the pipe joint is damaged.

  In the pipe joint of the present invention according to claim 3, it can be easily known from the appearance of the pipe joint that an abnormal force is applied to the lock pin and the pipe joint is damaged.

It is a half-cut sectional view which shows the state which the cover of the pipe joint which concerns on one Embodiment of this invention exists in a lock release position, and isolate | separated the nose and the body. It is a half-cut sectional view which shows the state which couple | bonded the nose and body of the pipe joint which concern on one Embodiment of this invention, and rotated the cover to the lock position. FIG. 3 is a half sectional view showing a state in which pressure is applied to the pipe joint shown in FIG. 2. (A) is a plan view of the pipe joint shown in FIG. 3, (B) is a side view in which a part of the pipe joint is cut in half, and (C) is a first convex part and a second convex part of the pipe joint. FIG. It is the side view seen from the direction of 45 degrees with respect to the pipe joint shown in FIG.4 (B). It is a top view of a single collet, and a half cut sectional view. (A) is an enlarged cross-sectional view showing the vicinity of the first and second protrusions when the cover is in the locked position, and (B) is the first view when the cover is slightly rotated in the direction of the unlocked position. It is an expanded sectional view showing the 1 convex part and the 2nd convex part neighborhood. It is a half-cut sectional view which shows the process of inserting a nose into a concave insertion part in the state which rotated the cover to the lock release position. It is a half-cut sectional view which shows the process of inserting a nose into a concave insertion part. It is a half-cut sectional view which shows the process of inserting a nose into a concave insertion part. It is a half-cut sectional view which shows the state which the circumferential groove of the nose engaged with the convex part of the collet in the concave insertion part. It is a half-cut sectional view which shows the state which rotated the cover of the pipe joint to the lock release position. (A) is a plan view of the pipe joint when the cover is rotated to the unlocking position, (B) is a side view with a part of the pipe joint being cut in half, and (C) is the first convex of the pipe joint. It is sectional drawing which shows a part and a 2nd convex part. It is the figure seen from the direction of 45 degrees with respect to the joint shown in FIG. 13, Comprising: (A) is a top view, (B) is a side view which made a part of pipe joint a half-section, (C) is a pipe joint It is sectional drawing which shows the 1st convex part and 2nd convex part. FIG. 5 is a half-cut sectional view showing a process of engaging a concave portion of a cover and a protruding portion of a body body at the unlocking position and pulling out a nose. It is a half cut sectional view showing the state where the nose was pulled out from the body. It is a half-cut sectional view which shows the state which the cover of the pipe joint which concerns on other embodiment of this invention exists in a lock release position, and isolate | separated the nose and the body.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a half cut sectional view showing a separated state of a pipe joint 10 according to an embodiment of the present invention, and FIG. 2 is a half cut sectional view showing a coupled state of the pipe joint 10.

  As shown in FIGS. 1 and 2, the pipe joint 10 includes a female body 12 and a male nose 40. This pipe joint 10 is used for the purpose of flowing a liquid such as beer at a predetermined pressure (for example, about 0.4 MPa).

  The body 12 includes a body main body 16 in which a cylindrical concave insertion portion 14 into which a nose 40 is inserted is formed. A channel portion 20 is formed in the core portion of the body main body 16 so as to communicate with the concave insertion portion 14 and through which a liquid flows. A threaded portion 16A is formed on the inner peripheral surface on the rear end side of the body main body 16, and a threaded portion of an adapter (not shown) connected to the rear end side of the body main body 16 is screwed to the threaded portion 16A. It has come to be.

  The body main body 16 is formed with a large inner diameter of the distal end portion 16B on the insertion port 14A side of the concave insertion portion 14 into which the nose 40 is inserted, and a cylindrical collet 22 as a lock member is disposed inside the distal end portion 16B. Is interpolated. Between the collet 22 and the distal end portion 16B of the body main body 16, a cylindrical holding member 24 that holds the collet 22 in the concave insertion portion 14 so as to be movable in the axial direction is provided. A convex portion 24A is formed on the outer periphery of the holding member 24, the holding member 24 is press-fitted into the distal end portion 16B of the body main body 16, and the convex portion 24A is engaged with a concave portion inside the distal end portion 16B. The member 24 is fixed to the distal end portion 16B.

  As shown in FIG. 6, the collet 22 is formed of a resin-made cylindrical body, and includes a plurality of cuts 23 formed along the axial direction on the side opposite to the end portion 22A on the insertion port 14A side of the cylindrical body. A length of about 2/3 is cut. On the inner peripheral surface of the collet 22, a convex portion 22 </ b> C that engages a circumferential groove 44 formed in the nose 40 is formed on the end portion 22 </ b> B side that is cut into a plurality. In the present embodiment, six cuts 23 are formed, and six convex portions 22C are formed. The collet 22 is formed with a plurality of cuts 23 so that the plurality of convex portions 22C can be expanded in diameter by elastic deformation. As shown in FIG. 2, the plurality of convex portions 22 </ b> C are engaged with a circumferential groove 44 formed on the outer peripheral surface of the nose 40 when the nose 40 is inserted into the concave insertion portion 14. . Further, the end 22B of the collet 22 disposed on the side opposite to the insertion port 14A protrudes radially outward.

  As shown in FIG. 3, on the outer peripheral side of the collet 22, a protrusion 22D protruding in the radial direction is formed in the vicinity of an intermediate portion in the axial direction. A protrusion 24B that protrudes inward is formed on the distal end side (insertion opening 14A side) of the holding member 24. When the protrusion 22D of the collet 22 moves to the insertion opening 14A side, the protrusion 24B of the holding member 24 is formed. The collet 22 can be prevented from coming off by hitting the pin.

  A resin cover 26 as a release member is externally attached to the outer peripheral side of the distal end portion 16B of the body main body 16 so as to be movable in the axial direction. The cover 26 is made of a cylindrical member, and is formed so that the end portion 26A on the side of the insertion port 14A is bent in a substantially right angle direction so as to be in contact with the end portion 22A of the collet 22.

  As shown in FIG. 1, a lock pin 30 protruding from the outer peripheral surface 16 </ b> C of the body main body 16 is provided at a position adjacent to the cover 26 on the rear side (opposite side of the tip end portion 16 </ b> B) of the body main body 16. Two lock pins 30 are provided in the direction of about 180 ° of the body main body 16, and these lock pins 30 are loaded on the cover 26 in the axial direction of the body main body 16 (downward direction in FIGS. 1 and 2). When the bending load F1 is applied to the lock pin 30 through the cover 26, the strength of the cover 26 rises on the lock pin 30 by the bending load F1, and the cover 26 is deformed (swelled or the like) or is damaged ( The strength is set so that it does not break until it is broken.

  More specifically, a cross-sectional shape viewed from the axial direction of the lock pin 30, that is, a cross-sectional shape cut in a direction orthogonal to the axial direction of the lock pin 30 is the axial direction of the body main body 16 (FIGS. 1 and 2). In the longitudinal direction), which is an elliptical shape in this embodiment. For this reason, when the lock pin 30 is subjected to a load acting on the cover 26 in the axial direction of the body main body 16 (the downward direction in FIGS. 1 and 2) and the bending load F1 is acting on the lock pin 30 via the cover 26. The strength is set so as not to be broken until the cover 26 rides on the lock pin 30 by the bending load F1 and the cover 26 is deformed (swelled or the like) or broken (broken or the like).

  On the other hand, two concave cutout portions 27 for moving each lock pin 30 are formed in the peripheral edge of the cover 26 with a length of about ¼ of the circumferential length in the circumferential direction. The cover 26 is rotatable in the circumferential direction until the one end 27 </ b> A and the other end 27 </ b> B of the notch 27 contact the lock pin 30. At this time, the lock position A for locking the movement of the cover 26 in the axial direction of the pipe connection portion (screw portion 16A side) at the position where the one end portion 27A of the cutout portion 27 abuts against the lock pin 30 (see FIG. 2). The unlock position B (see FIG. 1) allows the movement of the cover 26 in the axial direction of the pipe connecting portion (screw portion 16A side) to the position where the other end portion 27B of the notch portion 27 contacts the lock pin 30. ). In other words, the cover 26 is configured to be rotatable between the lock position A and the lock release position B in the circumferential direction.

  The other end portion 27B of the cutout portion 27 of the cover 26 is formed with a concave portion 27C that is recessed in the direction of the distal end portion 16B of the body main body 16, and the concave portion 27C engages with the lock pin 30 of the body main body 16. It is possible. As a result, at the lock release position B, the cover 26 can be moved to the pipe connection part side (screw part 16A side) in the axial direction by engaging the recess 27C of the cover 26 with the lock pin 30 of the body main body 16. It can be done.

  The end portion 26A of the cover 26 is formed so as to be able to contact the end portion 22A of the collet 22 on the insertion port 14A side, and by pushing the cover 26 to the rear side of the body main body 16 (in the insertion direction of the nose 40), The collet 22 is pushed and moved to the back side of the concave insertion portion 14. At this time, the end 22B on the back side of the collet 22 enters the groove 25 formed on the back side of the holding member 24 on the inner peripheral side of the body main body 16. Further, a protrusion 26B is formed on the inner peripheral surface of the cover 26, and a protrusion 18 that prevents the cover 26 from coming out by abutting the protrusion 26B of the cover 26 on the outer peripheral surface of the front end portion 16B of the body body 16. Is provided.

  7A shows a state where the cover 26 is rotated to the lock position A, and FIG. 7B shows a state where the cover 26 is slightly rotated from the lock position A in the unlocking direction. It is shown. As shown in these drawings, on the outer peripheral surface of the cover 26, a protrusion 26C protruding in the radial direction is provided at a position adjacent to the one end 27A of the notch 27. In addition, the outer peripheral surface of the body main body 16 facing the inner peripheral surface of the cover 26 is positioned near the lock pin 30 and has a diameter in the direction of the other end portion 27B of the notch 27 with respect to the lock pin 30. A first protrusion 32 protruding in the direction is provided. On the inner peripheral surface of the cover 26, a second convex portion 28 that protrudes inward of the cover 26 is provided at a position close to the one end portion 27A of the cutout portion 27 and adjacent to the cutout portion 27. It has been. The first convex portion 32 of the body body 16 and the second convex portion 28 of the cover 26 are formed at positions where they abut each other when the cover 26 is rotated in the circumferential direction. 7A, the first convex portion 32 of the body main body 16 and the second convex portion 28 of the cover 26 are disposed so as to face each other, and the second convex portion of the cover 26 is disposed. The first convex part 32 of the body main body 16 is located closer to the one end part 27 </ b> A of the notch part 27 than the part 28. Then, as shown in FIG. 7B, when the cover 26 is rotated to the unlock position B, the second convex portion 28 of the cover 26 needs to ride over the first convex portion 32 of the body main body 16. Yes, the rotation of the cover 26 is restricted.

  The first convex portion 32 has an inclined surface 32A on the lock pin 30 side formed with a gentle slope, and an inclined surface 32B opposite to the lock pin 30 formed with a steep slope. Further, the second convex portion 28 is formed of a convex curved surface, the inclined surface 28A on the one end portion 27A side of the notch portion 27 is formed with a steep slope, and the opposite side of the one end portion 27A of the notch portion 27 is formed. The inclined surface 28A is formed with a gentle gradient. Accordingly, when the cover 26 is rotated from the lock position A to the lock release position B, the steep inclined surface 32B of the first convex portion 32 and the steep inclined surface 28A of the second convex portion 28 contact each other. Therefore, the resistance increases. Further, when the cover 26 is rotated from the unlock position B to the lock position A, the gently inclined surface 32A of the first projecting portion 32 and the gently inclined surface 28B of the second projecting portion 28 come into contact with each other. Becomes smaller.

  On the other hand, as shown in FIGS. 1 and 2, the nose 40 is formed so as to have a smaller diameter as it goes to the distal end portion 42. As described above, the peripheral surface of the nose 40 is formed with a trapezoidal circumferential groove 44 that can be engaged with the convex portion 22 </ b> C of the collet 22 when inserted into the concave insertion portion 14 of the body 12. A concave circumferential groove 46 is formed on the circumferential surface of the nose 40 on the tip side from the circumferential groove 44, and an O-ring 48 is fitted into the circumferential groove 46. A channel portion 50 through which a liquid flows is formed in the core portion of the nose 40. In addition, a connection portion 52 to which a hose (not shown) is connected is provided at the end portion of the nose 40 opposite to the distal end portion 42.

  A display portion 54 is provided on the outer peripheral surface of the nose 40 along the circumferential direction closer to the central portion in the axial direction than the circumferential groove 44. The display portion 54 is composed of a single red line, and is hidden inside the body 12 when the nose 40 is inserted into the concave insertion portion 14 and the circumferential groove 44 is engaged with the convex portion 22C of the collet 22. In the position. The display unit 54 can be provided by printing, for example.

Next, the operation of the pipe joint 10 of the present invention will be described.
As shown in FIGS. 1 and 8, when connecting the nose 40 and the body 12, the nose 40 is inserted into the concave insertion portion 14 of the body main body 16. As shown in FIG. 9, when the nose 40 is inserted, the peripheral surface of the nose 40 pushes the convex portion 22C of the collet 22, and the end 22B of the collet 22 expands due to elastic deformation in the groove 25 on the back side of the holding member 24. Diameter. As shown in FIG. 10, when the nose 40 reaches the back side of the concave insertion portion 14 of the body main body 16, the convex portion 22C is formed in the circumferential groove 44 of the nose 40 by elastic restoring force as shown in FIG. Engage. At this time, the collet 22 slightly moves to the insertion port 14A side, and the cover 26 that contacts the end 22A of the collet 22 moves to the nose 40 side (the side opposite to the screw portion 16A). Further, when the convex portion 22C of the collet 22 is engaged with the circumferential groove 44 of the nose 40 by the elastic restoring force, a click sound is generated, and the convex portion 22C is engaged with the circumferential groove 44 of the nose 40 by this clicking sound. You can also confirm that

  In a state where the convex portion 22C of the collet 22 is engaged with the circumferential groove 44 of the nose 40, the display portion 54 provided on the outer peripheral surface of the nose 40 is hidden inside the body 12 (the cover 26 in the present embodiment). On the other hand, when the insertion of the nose 40 into the concave insertion portion 14 is insufficient, or when the nose 40 is inserted in an oblique direction, the display portion 54 of the nose is the body 12 (in this embodiment, the cover 26). ) (See, for example, FIGS. 8 and 9). For this reason, by visually confirming that the display portion 54 of the nose 40 is not exposed from the body 12 (the cover 26 in the present embodiment), the circumferential groove 44 of the nose 40 is convex in a state where the insertion of the nose 40 is insufficient. It can suppress misunderstanding that it engaged with the shape part 22C.

  Thereafter, the collet 22 is locked by rotating the cover 26 to the lock position A as shown in FIG. That is, as shown in FIG. 4A, the letters “LOCK” and “REMOVE” are formed on the front end surface of the cover 26 (the surface on the insertion port 14A side). The cover 26 is rotated until the lock pin 30 is positioned. When the cover 26 is rotated to the lock position A, since the gentle inclined surface 32A of the first convex portion 32 and the gentle inclined surface 28B of the second convex portion 28 contact each other, the resistance is small and the cover 26 is rotated. It's easy to do. The pipe joint 10 can insert the nose 40 into the concave insertion portion 14 of the body main body 16 regardless of whether the cover 26 is in the lock position A or the lock release position B.

  At the lock position A, one end portion 27A of the cutout portion 27 of the cover 26 is in contact with the lock pin 30 of the body main body 16, the cover 26 interferes with the lock pin 30, and the cover 26 is axially connected to the pipe connection portion side. It cannot move to the (screw part 16A side). For this reason, the nose 40 cannot be pulled out from the concave insertion portion 14 without the collet 22 being pushed into the back side of the concave insertion portion 14.

  Further, in the present embodiment, the cross-sectional shape of the lock pin 30 viewed from the axial direction is an elliptical shape whose longitudinal direction is the axial direction of the body main body 16 (the vertical direction in FIGS. 1 and 2). A load acts on the cover 26 in the axial direction of the body main body 16 (downward in FIGS. 1 and 2), and a bending load (arrow F1 in FIGS. 1 and 2) acts on the lock pin 30 via the cover 26. In this case, the strength is set so that the cover 26 does not break until the cover 26 rides on the lock pin 30 due to the bending load F1 and the cover 26 is deformed (swelled or the like) or broken (broken or the like). For this reason, for example, an abnormal force is applied to the cover 26 of the pipe joint 10 set and packaged and shipped in the locked position during transportation, or a fallen object or the like comes into contact with the cover 26 of the pipe joint 10 in use. When force is applied and a bending load F1 is applied to the lock pin 30, the cover 26 rides on the lock pin 30 before the lock pin 30 is broken, and the cover 26 is deformed or damaged. Specifically, the cover 26 swells up or cracks. As a result, it is possible to easily know from the appearance of the pipe joint 10 that an abnormal force is applied to the lock pin 30 and a part of the pipe joint 10 is damaged.

  Therefore, it is easy to understand from the appearance of the pipe joint 10 that it is necessary to stop using the pipe joint 10, and the lock pin 30 is not broken, so that it is possible to prevent the nose 40 from coming off from the body main body 16.

  As shown in FIGS. 4 and 5, at the lock position A, the lock pin 30 of the body main body 16 is in contact with one end portion 27 </ b> A of the cutout portion 27 of the cover 26, so The portion 32 is located closer to the one end portion 27 </ b> A of the cutout portion 27 than the second convex portion 28 of the cover 26. In this state, even if the cover 26 tries to rotate in the direction of the unlocking position B, the second convex portion 28 of the cover 26 hits the first convex portion 32 of the body main body 16 and the rotation of the cover 26 is restricted. The That is, when the cover 26 is rotated to the unlock position B, the second convex portion 28 of the cover 26 needs to ride on the first convex portion 32 of the body body 16, and the second convex portion The cover 26 cannot be rotated unless the force 28 overcomes the first protrusion 32 is applied. As shown in FIG. 7, when the cover 26 is rotated from the lock position A to the lock release position B, the steep inclined surface 32 </ b> B of the first convex portion 32 and the steep slope of the second convex portion 28. Since the surface 28A hits, the resistance is large and the cover 26 is difficult to rotate. For this reason, it is possible to suppress or prevent the cover 26 from being inadvertently rotated to the unlocking position B when the pipe joint 10 is used.

  On the other hand, when the nose 40 is detached from the body 12, the cover 26 is rotated from the lock position A to the lock release position B as shown in FIG. As shown in FIG. 4A, at the lock position A, the “lock” position of the cover 26 is at the position of the lock pin 30. Therefore, as shown in FIG. The cover 26 is rotated until the position reaches the position of the lock pin 30. At this time, as shown in FIG. 7, the cover 26 made of resin is elastically deformed and gets over the first convex portion 32 by rotating the cover 26 with a certain force or more. Then, as shown in FIGS. 13 and 14, the cover 26 is rotated to the unlocking position B where the other end 27 </ b> B of the notch 27 abuts the lock pin 30, whereby the recess 27 </ b> C of the cover 26 and the lock pin are 30 faces.

  As shown in FIG. 10, by engaging the recess 27C of the cover 26 and the lock pin 30 at the unlocking position B, the cover 26 is connected to the pipe connecting portion side in the axial direction of the body body 16 (in the insertion direction of the nose 40). Push into. Thereby, the end portion 26A of the cover 26 on the insertion port 14A side pushes the end portion 22A of the collet 22, the end portion 22B on the back side of the collet 22 is elastically deformed and enters the groove portion 25 on the back side of the holding member 24, The engagement between the convex portion 22C of the collet 22 and the circumferential groove 44 of the nose 40 is released. In this state, as shown in FIGS. 15 and 16, the nose 40 can be pulled out from the concave insertion portion 14, and the nose 40 and the body 12 can be separated.

[Other Embodiments]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, the cross-sectional shape cut in the direction orthogonal to the axial direction of the lock pin 30 is an elliptical shape whose longitudinal direction is the axial direction of the body 12 (vertical direction in FIGS. 1 and 2). Instead of the shape, the cross-sectional shape may be an oval shape (a shape in which both ends in the longitudinal direction of the rectangle are semicircular) with the axial direction of the body 12 as the longitudinal direction, as shown in FIG. Other long shapes such as a rectangular shape may be used.

  Further, a reinforcing insert or the like may be provided on the lock pin 30, and the strength of the lock pin 30 when a bending load is applied may be set to a strength that does not break until the cover 26 is deformed or damaged by the bending load. .

  Moreover, in the said embodiment, although beer was poured as a liquid, it is not restricted to this, A carbonated drink and another fluid are applicable.

10 Pipe Joint 12 Body 16 Body Body 22 Collet 26 Cover 30 Lock Pin 40 Nose

Claims (3)

A nose connected to one end of the flow path;
A body that is connected to the flow path end on the other side and in which the nose is inserted so that the flow path end on the other side communicates with the flow path end on the one side;
A lock pin protruding from the outer peripheral surface of the body;
It is attached to the outer peripheral side of the tip of the body so as to be movable in the axial direction of the body, and a lock position where movement to the pipe connection side is locked by the lock pin and movement to the pipe connection side are allowed. A cover that is rotatable between the unlocked position and the circumferential direction of the body,
And the strength of the lock pin with respect to the bending load is set to a strength that does not break until the cover is deformed or damaged by the bending load.   2. The pipe joint according to claim 1, wherein a cross-sectional shape of the lock pin is a long shape whose longitudinal direction is an axial direction of the body.   3. The pipe joint according to claim 1, wherein a cross-sectional shape of the lock pin is an elliptical shape whose longitudinal direction is the axial direction of the body.

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