JP5489843B2 - Sealing material with separation prevention function and separation prevention pipe joint - Google Patents

Description

  The present invention relates to a seal member with a detachment preventing function and a detachment prevention pipe joint used for a detachment prevention pipe joint that prevents the pipes connected to each other from detaching.

  It is already widely known that pipes are configured by connecting a plurality of pipes such as ductile cast iron pipes as water pipes laid in the ground. In this type of pipe, when using a deformed pipe such as a curved pipe or a T-shaped pipe, the pipe is connected by water pressure at a bent portion or a branched portion (that is, a location where the water flow direction is changed). Since a force (non-average force) to be moved acts, a separation preventing function for preventing the pipes from separating from each other even when such an unbalanced force is applied is added.

  As one of the conventional tube separation preventing structures, as shown in FIG. 23, a joint portion (a curved tube 51 in FIG. 23) and a joint 52 (53, 53) connected to the deformed tube 51 ( A structure (referred to as a concrete block structure) covered with a concrete block 55 is used over the joint portion) 54, and the pipes 52 and 53 and the deformed pipe 51 are integrated with the concrete block 55 in this way, 53 and the deformed pipe 51 are prevented from separating. As another pipe detachment prevention structure, as shown in FIGS. 24 and 25, a lock ring 65 is provided on the inner peripheral surface of the receiving port 63 and the outer peripheral surface of the insertion port 64 of the tubes 61 and 62. The lock ring receiving grooves 66 and 67 are formed, and the lock ring 65 divided in the circumferential direction is arranged over the grooves 66 and 67. After the pipes 61 and 62 are joined, the lock ring 65 is connected to the receiving port 63. There is a structure in which a set bolt 68 penetrating in the tube diameter direction is pressed inward in the tube diameter direction to prevent the lock ring 65 from being expanded, thereby preventing the pipes 61 and 62 from being detached via the lock ring 65. .

  However, when a concrete block structure as shown in FIG. 23 is used, since the concrete block 55 must be completely cured and then placed in the ground, it takes a long time for the concrete to cure. . Therefore, when it is necessary to restore the road at an early stage, the concrete block structure as shown in FIG. 23 is not adopted, and the structure using the lock ring 65 as shown in FIG. 25 is adopted.

  However, when the lock ring structure as shown in FIG. 25 is used, when the lock ring 65 is fitted into the groove 64 of the receiving port 61 while the diameter of the lock ring 65 is reduced, a tool or equipment for reducing the diameter is required. This leads to a disadvantage of increasing costs such as costs, or requiring a lot of time for the fitting work.

  As a detachment prevention pipe joint that can improve such a defect, a seal material (hereinafter referred to as a seal material with a detachment prevention function or simply referred to as a seal material) 70 provided with a detachment prevention function as shown in FIGS. It has been proposed to be provided in a detachment prevention pipe joint. That is, not only the sealing material main body 78 having elasticity is disposed in the sealing material accommodating groove 72 formed on the inner peripheral surface of the receiving port 71, but also the claw portion 73a on the inner peripheral portion of the sealing material main body 78. , 73b is embedded. Then, as shown in FIG. 30, when the tubes are about to move in the separation direction due to the non-average force or the like (that is, the insertion port 75 tries to move in the c direction relative to the reception port 71). When the insertion port 75 is about to be detached from the receiving port 71), the lock body 73 rotates in the direction a while abutting against the receiving port inner protrusion 76 formed in the sealing material accommodation groove 72 of the receiving port 71. Thus, the claw portions 73a and 73b of the lock body 73 bite into the outer peripheral surface of the insertion port 75, and as a result, the separation of the tubes is prevented (that is, the insertion port 75 is prevented from being detached from the receiving port 71). It is configured.

  In addition, a curved groove 73 c that comes into contact with the receiving port inner protrusion 76 formed in the sealing material receiving groove 72 of the receiving port 71 is formed in a recessed shape on the outer peripheral portion of the lock body 73. Then, when the insertion port is inserted (at the time of pipe joining), as shown in FIGS. 28 and 29, the lock body 73 is formed on the receiving port inner surface protrusion 76 formed in the sealing material receiving groove 72 of the receiving port 71. The insertion slot 75 is pushed in such a state that the curved groove 73c is in sliding contact and the claw 73b of the lock body 73 is in strong contact with the outer peripheral surface of the insertion slot 75. Then, the entire lock body 73 is rotated in the d direction while deforming the sealing material main body 78 so that the claw portion 73a of the lock body 73 is pushed outward from the outer peripheral surface of the insertion opening 75 by the insertion force of the insertion opening 75. Thus, the insertion of the insertion opening 75 inside the lock body 73 is allowed.

  By using this detachment prevention pipe joint structure, as a necessary work for detachment prevention, a seal material 70 with a detachment prevention function in which the lock body 73 is embedded is prepared in advance, and the seal material 70 is placed in the receiving port 71. All you need to do is arrange. This eliminates the need for a diameter reduction jig and equipment, and also eliminates the need for a diameter reduction operation of the lock ring, thereby saving labor and time for the diameter reduction operation.

  Note that a separation preventing pipe joint having a structure similar to that of the separation preventing pipe joint shown in FIGS.

JP-A-6-221478

  However, in the detachment prevention pipe joint shown in FIGS. 26 to 30 and the detachment prevention pipe joint disclosed in Patent Document 1, when the insertion port 75 is inserted into the receiving port 71 and the tubes are joined to each other, Since the claw portion 73b is configured to rotate the lock body 73 by applying a large force to the lock body 73 from the insertion opening 75 in a state in which the claw portion 73b is in direct contact with the outer peripheral surface of the insertion opening 75 while applying a relatively large pressing force. At this time, there is a problem that the outer peripheral surface of the insertion opening 75 is damaged at the contact portion with the claw portion 73b and may corrode from the damaged position when passing water.

  The present invention solves the above-mentioned problems, and can perform the joining operation of the tubes easily and in a short time, and when inserting the insertion port into the receiving port to join the tubes together, the claw portion of the lock body It is an object of the present invention to provide a separation preventing pipe joint and a sealing material with a separation preventing function that do not damage the outer peripheral surface of the insertion opening.

  In order to solve the above-mentioned problems, the sealing material with a detachment preventing function of the present invention has an insertion formed at the end of the other tube inside the receiving port formed at the end of one of the tubes joined together. Used in a detachment prevention pipe joint into which a port is inserted, and disposed in a seal material accommodation groove formed on the inner periphery of the receiving port, and compressed between the receiving port and the inserting port. A seal member for sealing between the elastic seal member and a lock body for preventing detachment is embedded in an elastic and compressible annular seal member body, and the lock member is inserted into the receiving port. A claw portion that bites into the outer peripheral surface of the insertion opening is formed when the plug is about to come out, and the claw portion comes into contact with the outer peripheral surface of the insertion opening when the insertion opening is inserted into the sealing material. An elastic body for rotation that rotates the lock body in a direction away from the rotation body is provided. It is preferable that a plurality of claw portions are formed in the lock body in the tube axis direction, and an elastic body for rotation is provided in the vicinity of the claw portion near the opening of the receiving opening.

  With the above configuration, when the insertion port formed at the end of the other tube is inserted into the receiving port formed at the end of one tube to join the tubes, the rotation provided in the sealing material The elastic body for contact comes into contact with the outer peripheral surface of the insertion port, and the lock member rotates in a direction away from the claw portion of the lock member from the outer peripheral surface of the insertion port. Therefore, when the insertion port is inserted into the receiving port and the tubes are joined together, the claw portion of the lock body is separated from the outer peripheral surface of the insertion port, and as a result, the claw portion prevents the outer peripheral surface of the insertion port from being damaged. it can.

  Further, the elastic body for rotation of the sealing material with a separation preventing function of the present invention is disposed so as to protrude inward in the pipe radial direction at a place where at least a part of the claw portion of the lock body is removed. Features.

  With this configuration, at least a part of the claw portion is removed at the place where the rotation elastic body is disposed, so that the rotation elastic body is disposed with the claw portion remaining (remaining). Therefore, the lock body can be rotated when the insertion opening is inserted, and the claw portion can be separated from the outer peripheral surface of the insertion opening. That is, when the claw portion is provided and the rotation elastic body is disposed so as to cover the claw portion or the vicinity of the claw portion, the claw portion causes the rotation elastic body to be inserted when the insertion opening is inserted. Is cut off, and the claw part comes into contact with the outer peripheral surface of the insertion slot, causing scratches, or the rotating elastic body escapes from between the claw part and the outer peripheral surface of the insertion slot, It becomes impossible to rotate well, the claw part comes into contact with the outer peripheral surface of the insertion slot, and scratches are generated, or the force during insertion of the insertion slot becomes extremely large, resulting in a decrease in workability. Although the problem occurs, according to the present invention, such a problem does not occur.

  The rotating elastic body has an inclined surface portion whose cross-sectional shape increases by a certain amount from the inner peripheral surface portion of the seal material main body toward the inner side in the tube axial direction, and a deeper portion in the tube axial direction of the inclined surface portion. Although it may be configured to have a thick flat surface portion that continues to be a thick flat shape on the end side, it is preferable that the rotating elastic body has a cross-sectional shape on the inner side in the tube diameter direction toward the rear side in the tube axis direction. A curved inclined surface portion that is inclined so as to increase in the amount of increase in protrusion to the curved shape, and a thick flat surface portion that smoothly follows the thick-walled portion of the curved inclined surface portion on the inner side in the tube axis direction. It is good to arrange | position and arrange | position so that an insertion port front-end | tip part may contact | abut to the thin protrusion part of a curved inclined surface part first at the time of insertion insertion.

  Such a detachment prevention pipe joint has a structure that allows the insertion of the insertion opening by rotating the lock body by deforming the seal material during insertion of the insertion opening, and therefore requires a relatively large force when inserting the insertion opening. . By providing the rotation elastic body, it is possible to prevent the outer peripheral surface of the insertion opening from being damaged by the claw when inserting the insertion opening, but the rotation elastic body abuts on the outer peripheral surface of the insertion opening during insertion. This will require even greater power. However, as described above, the curved shape of the rotating elastic body increases such that the cross-sectional shape increases from the inner peripheral surface portion of the sealing material main body toward the inner side in the tube radial direction toward the inner side in the tube axial direction. By forming the inclined surface and arranging the tip of the insertion port so as to first contact the thin protruding portion of the curved inclined surface during insertion of the insertion port, the increase in insertion force of the insertion port at this time can be minimized. it can. In addition, since the cross-sectional shape of the curved inclined surface portion of the elastic body for rotation is a curved shape, if the insertion port is continuously inserted when the insertion port is inserted, the sealing material is smoothly deformed according to the protruding amount of the rotation elastic body. The lock body is rotated satisfactorily. Eventually, the insertion port comes into contact with the thick flat surface portion of the elastic body for rotation, and the claw portion of the lock body is separated from the outer peripheral surface. Can be more reliably prevented.

  Further, the sealing material with a detachment preventing function of the present invention is a lock body that is rotated by an elastic body for rotation at the time of insertion of the insertion opening on the surface of the receiving end portion side following the tip portion of the claw portion. A protective material is provided that prevents the claw portion from abutting against the outer peripheral surface of the insertion opening or reduces the abutting force.

  In the above configuration, when the rotation elastic body is only provided on the lock body, the lock body is rotated in the direction in which the claw portion is separated from the outer peripheral surface of the insertion opening when the insertion opening is inserted by the rotation elastic body. Regardless of the reason that the gap between the outer periphery of the insertion port and the receiving port is very small, there is a possibility that the claw may come into contact with the outer surface of the insertion port and be damaged when the insertion port is inserted. As described above, by providing a protective member on the lock body, it is possible to reduce or prevent the contact of the claw portion of the lock body against the outer peripheral surface of the insertion slot. Therefore, it is possible to more reliably prevent or minimize the damage to the outer peripheral surface of the insertion opening due to the claw when inserting the insertion opening.

  The protective material may be formed on the inner surface of the corresponding nail portion in the tube radial direction in a thin shape with a substantially constant thickness, but if necessary, the nail portion on which the protective material is disposed. A thick part may be provided on the inner surface in the pipe radial direction in the vicinity of the tip part, and the thick part of the protective material may be formed in an area narrower and smaller than the claw part. Moreover, you may form a protective material in the state which has a clearance gap between corresponding claw parts.

  For example, when a claw part provided with a protective material is sharpened and formed so that the claw part is securely locked to the insertion port when the insertion port is about to be detached, the protection material can be used. If the inner surface of the claw portion is simply formed in a thin shape with a substantially constant thickness, the protective function by the protective material becomes insufficient, and the outer peripheral surface of the insertion opening may be damaged by the claw portion. In order to cope with this, if the protective material is formed with a substantially constant thickness, it is possible to prevent the outer peripheral surface of the insertion slot from being damaged by the claw, but the protective material is more strongly applied to the outer peripheral surface of the insertion opening during insertion. In contact, it will require even greater power. On the other hand, as described above, if the thick part of the protective material is formed only in a region that is narrower and smaller than the claw part, it is possible to prevent the claw part from damaging the outer peripheral surface of the insertion opening, Since it becomes easy to deform | transform with comparatively small force, the increase in the insertion force required for insertion at the time of insertion insertion can be suppressed to the minimum. In addition, if the protective material is formed up to the tip of the corresponding nail part or near the tip part, the protective material may enter between the nail part and the outer peripheral surface of the insertion opening to protect the case. The material may be cut, and in this case, a large force may be required to insert the insertion opening. In contrast, by forming the protective material so that there is a gap between the claw portion and the protective material, the protective material enters between the claw portion and the outer peripheral surface of the insertion port when the insertion port is inserted. Can be prevented, and the force required to insert the insertion opening can be reduced.

  In addition, as an arrangement configuration of the elastic body for rotation and the protective material, the elastic body for rotation is disposed at both ends with respect to the width direction of the lock body along the circumferential direction of the tube in the lock body, and the protective material is provided. A claw portion is formed between the elastic bodies for rotation, or the elastic body for rotation is disposed at a central portion with respect to the width direction of the lock body along the circumferential direction of the tube in the lock body, and a protective material is provided. What is necessary is just to arrange | position a nail | claw part to the both ends with respect to the width direction of a lock body, respectively.

  Further, by forming the rotating elastic body from the same material as the sealing material body or a material having the same hardness as the sealing material body, the sealing material body and the rotating elastic body can be integrally formed.

  Further, as the elastic body for rotation, the elastic body for rotation may be formed of a material different from that of the sealing material body or a material having a hardness different from that of the sealing material body.

  As described above, according to the present invention, the rotating elastic body that rotates the lock body in the direction in which the claw portion separates from the outer peripheral surface of the insertion opening by contacting the outer peripheral surface of the insertion opening when the insertion opening is inserted is provided. Accordingly, when the insertion port is inserted, the lock body is rotated by the rotating elastic body, the claw portion of the lock body is rotated in a direction away from the outer peripheral surface of the insertion port, and the outer peripheral surface of the insertion port is damaged by the claw portion. Can be prevented. As a result, the pipe can be joined easily and in a short time, and the outer peripheral surface of the insertion port is not damaged. Therefore, even when the pipe joint having this sealing material is used as a water pipe, etc. The possibility of corrosion during water and the like can be minimized, and good reliability can be maintained.

  According to the present invention, the function of preventing the outer peripheral surface of the insertion opening from being damaged by the claw portion by disposing the elastic body for rotation in a place where at least a part of the claw portion of the lock body is removed. Can be obtained more reliably.

  In addition, a curved inclined surface portion that increases so that the amount of increase in protrusion in the tube radial direction increases toward the inner side in the tube axis direction is formed on the elastic body for rotation, and the distal end portion of the insertion port is first curved inclined surface portion when the insertion port is inserted. It is possible to prevent the claw portion from damaging the outer peripheral surface of the insertion port, and at the same time minimize the increase in insertion force of the insertion port when inserting the insertion port. it can. Therefore, if the insertion force of the insertion opening becomes extremely large when inserting the insertion opening, a special joining jig may be required. It is not necessary, and the workability of the joining work can be improved and the equipment cost can be reduced.

  Further, according to the present invention, the force that prevents or abuts the claw portion of the lock body from abutting on the outer peripheral surface of the insertion port when the insertion port is inserted, on the surface of the claw portion on the receiving end portion side following the tip portion. By providing a protective material that reduces the damage, it is possible to more reliably prevent or minimize the damage to the outer peripheral surface of the insertion slot due to the claw when inserting the insertion slot. Further improvement can be achieved.

  In addition, a thick portion is provided on the inner surface in the pipe radial direction in the vicinity of the tip of the claw portion where the protective material is disposed, and the thick portion of the protective material is formed in a narrower and smaller area than the claw portion. By doing so, it is possible to more reliably prevent the outer peripheral surface of the insertion slot from being damaged by the claw portion, while minimizing the increase in insertion force required for insertion at the time of insertion. In addition, by forming the protective material so that there is a gap between the claw portion and the protective material, it is possible to prevent the protective material from entering between the claw portion and the outer peripheral surface of the insertion port when the insertion port is inserted. Therefore, it is possible to reduce the force required for insertion of the insertion opening and improve the work efficiency.

It is sectional drawing of the separation prevention pipe joint provided with the sealing material with a separation prevention function which concerns on embodiment of this invention. It is sectional drawing of the sealing material with the removal prevention function of the separation prevention pipe joint, and the location where the lock body is not provided is shown. (A) And (b) is the perspective view which looked at the locking body, the elastic body for rotation, and the protective material of the sealing material with the same separation prevention function from diagonally downward, and the bottom view which looked from the downward direction. (A) and (b) are the sectional view taken along the line IVa-IVa and the line IVb-IVb in FIG. It is sectional drawing. (A) And (b) is a principal part expanded sectional view of the said separation prevention pipe joint, respectively, and shows the state just before inserting an insertion port. (A) And (b) is a principal part expanded sectional view of the same separation prevention pipe joint, and shows the state which is inserting the front-end | tip part of an insertion port. (A) And (b) is the principal part expanded sectional view of the said separation prevention pipe joint, and shows the state which inserted the insertion opening. It is a principal part expanded sectional view of the same detachment prevention pipe joint, and shows a state when the insertion port is about to detach from the receiving port. It is a front view of the sealing material with a separation prevention function of the separation prevention pipe joint. (A)-(c) is the principal part expanded sectional view of the lock body and elastic body for rotation of the sealing material with a separation prevention function in the separation prevention pipe joint as a comparative example, respectively. (A) And (b) is sectional drawing of the separation prevention pipe joint which concerns on embodiment of this invention, respectively, and shows the case where the clearance gap between a receiving port and an insertion port is wide (large). (A) And (b) is the perspective view which looked at the lock body, the elastic body for rotation, and the protective material of the sealing material with a removal prevention function which concerns on other embodiment of this invention from diagonally downward, and it looked from the downward direction It is a bottom view. (A), (b) and (c) are cross-sectional views taken along the line XIIIa-XIIIa in FIG. They are XIIIb arrow sectional drawing and XIIIc-XIIIc arrow sectional drawing. (A), (b), and (c) are the principal part expanded sectional views of the said removal prevention pipe joint, respectively, and show the state just before inserting an insertion port. (A), (b) and (c) are the principal part expanded sectional views of the said separation prevention pipe joint, respectively, and show the state which is inserting the front-end | tip part of an insertion port. (A), (b) and (c) are the principal part expanded sectional views of the said separation prevention pipe joint, respectively, and show the state which inserted the insertion slot. (A) And (b) is the perspective view which looked at the lock body, the elastic body for rotation, and the protective material of the sealing material with a removal prevention function which concerns on other embodiment of this invention from diagonally downward, and sees from the downward | lower direction. FIG. (A), (b) and (c) are cross-sectional views taken along the line XVIIIa-XVIIIa in FIG. FIG. 8 is a cross-sectional view taken along line XVIIIb and a cross-sectional view taken along line XVIIIc-XVIIIc. (A), (b), and (c) are the principal part expanded sectional views of the said removal prevention pipe joint, respectively, and show the state just before inserting an insertion port. (A), (b) and (c) are the principal part expanded sectional views of the said separation prevention pipe joint, respectively, and show the state which is inserting the front-end | tip part of an insertion port. (A), (b) and (c) are the principal part expanded sectional views of the said separation prevention pipe joint, respectively, and show the state which inserted the insertion slot. FIG. 17 is an enlarged cross-sectional view of a main part illustrating a state in which a protective material has entered the separation preventing pipe joint illustrated in FIGS. 12 to 16. It is a figure which shows schematically the conventional detachment | leave prevention structure of a pipe | tube. It is a figure which shows the external appearance of the separation prevention pipe joint as another conventional separation prevention structure. It is sectional drawing of the same conventional detachment prevention pipe joint. It is sectional drawing of other conventional detachment prevention pipe joints. It is a principal part expanded sectional view of the conventional separation prevention pipe joint, and shows the state just before inserting an insertion slot. It is a principal part expanded sectional view of the conventional separation prevention pipe joint, and shows the state which is inserting the insertion slot. The principal part expanded sectional view of the conventional disconnection prevention pipe joint shows the state which inserted the insertion slot. It is a principal part expanded sectional view of the conventional separation prevention pipe joint, and shows the state at the time of an insertion port trying to detach | leave from a receptacle.

  Hereinafter, a separation preventing pipe joint including a sealing material with a separation preventing function according to an embodiment of the present invention will be described with reference to the drawings. 1 and 5 to 8 are cross-sectional views of the separation preventing pipe joint provided with the sealing material with a separation preventing function according to the embodiment of the present invention, and FIG. 5 shows a state immediately before the insertion port is inserted. 6 shows a state in which the distal end portion of the insertion opening is being inserted, FIG. 7 shows a state in which the insertion opening is inserted, and FIG. 8 shows a state in which the insertion opening is about to be detached from the receiving opening. 3 (a) and 3 (b) are a perspective view of the locking body, the elastic body for rotation, and the protective material of the sealing material with the function of preventing detachment as seen obliquely from below and a bottom view as seen from below. (A) and (b) are the sectional view taken along the line IVa-IVa and the line IVb-IVb in FIG. It is sectional drawing.

  As shown in FIG. 1, a detachment prevention pipe joint 1 according to an embodiment of the present invention has a receiving port 3 formed at an end portion of one pipe 2 to be joined to the end of the other pipe 4. The insertion port 5 formed in the section is inserted, and the ring is formed in the seal material accommodation groove 6 formed in the inner periphery of the receiving port 3 (specifically, the inner periphery of the portion on the back side of the tube end surface 3a of the receiving port 3). The sealing material 7 is disposed, and the sealing material 7 is compressed between the receiving port 3 and the insertion port 5, whereby the insertion port is sealed. In addition, 5a in FIG. 1 is the inclined surface of the insertion port 5 formed in the outer periphery of the front-end | tip part of the insertion port 5, and becomes thin as the front-end | tip.

  Here, as will be described later, the sealing material 7 provided in the separation preventing pipe joint 1 according to the embodiment of the present invention has a separation preventing function for preventing the mutually connected tubes 2 and 4 from separating. Have. The pipes 2 and 4 are made of, for example, ductile cast iron, but are not limited thereto.

  Hereinafter, the structure of the sealing material (sealing material with a separation preventing function) 7 and the sealing material accommodation groove 6 of the receiving port 3 in which the sealing material 7 is disposed will be described in detail. As shown in FIG. 2 and the like, the sealing material 7 includes a heel portion (a collar portion) 7a that holds the sealing material 7 at a predetermined position in the sealing material accommodation groove 6 and a valve portion 7b that performs a seal between the insertion port. And the valve portion 7b has a substantially circular cross section (or a substantially elliptical cross section) in a state where no external force is applied. Correspondingly, a fitting groove 6a in which the heel portion 7a of the sealing material 7 is fitted into the sealing material accommodation groove 6 to lock the sealing material 7, and a valve in which the valve portion 7b of the sealing material 7 is accommodated. A part receiving groove 6b is formed.

  Further, between the fitting groove 6a and the valve portion housing groove 6b in the sealing material housing groove 6 of the receiving port 3, there is formed a receiving port inner surface protruding portion 8 that protrudes inward (inner side in the pipe diameter direction). The material 7 is also formed with a curved groove portion 7c that is slidably in contact with the receiving port inner surface protruding portion 8. In this embodiment, the end portion of the receiving-portion inner surface protruding portion 8 has a substantially semicircular cross section, but is not limited to this shape.

  As shown in FIG. 1 to FIG. 4 and the like, the sealing material 7 is detached from an annular sealing material main body 9 made of rubber having elasticity and compressible, and made of a material having high rigidity such as a metal piece. As shown in FIG. 9, a plurality of prevention locking bodies 10 are embedded in the circumferential direction at intervals. In this embodiment, the case where the eight lock bodies 10 are arranged at equal intervals in the circumferential direction is illustrated, but the number of the lock bodies 10 is increased or decreased, and the lock bodies 10 are arranged accordingly. The interval may be changed.

  As shown in FIG. 8, the lock body 10 has an insertion port when the insertion port 5 is about to come out of the receiving port 3, that is, when the tubes 2 and 4 are about to move away from each other. 5 and 7, the claw portions 10 a and 10 b that bite into the outer peripheral surface of the tube 5, and when the insertion port 5 is inserted into the reception port 3 and the tubes 2 and 4 are joined to each other, as shown in FIGS. In the sealing material accommodation groove 6 of the port 3, a curved groove portion 10 c that can be slidably contacted with the receiving-portion inner surface protruding portion 8 is formed.

  As shown in FIGS. 3 to 7, the claw portions 10 a and 10 b are formed so as to protrude obliquely from the lock body 10 to the inner side of the sealing material 7, more specifically to the inner side of the receiving port 3 and the inner side in the pipe diameter direction. In this embodiment, a case is shown in which each lock body 10 is formed so that two claw portions 10a and 10b are arranged in the tube axis direction. Although not shown, three or more claw portions 10a and 10b may be arranged in the tube axis direction.

  Here, as shown in FIG. 3, FIG. 4, etc., the claw part (also referred to as the back claw part) 10 a on the back side from the opening end of the receiving port 3 is the full width of the lock body 10 (note that the lock body 10 The width direction is formed over the circumferential direction of the pipe in which the receiving port 3 and the like are formed. However, the claw portions (also referred to as opening claw portions) 10b near the opening end of the receiving port 3 are formed so as to remain only in the center portion in the width direction of the lock body 10, and both end portions of the lock body 10 in the width direction. The claw portions 10b near the opening are removed by cutting or the like at the side portions, and the removed portions that have been cut off have the same elasticity as the sealing material body 9 made of, for example, rubber. An elastic body 11 for rotation is integrally formed with the seal material main body 9. The rotating elastic body 11 may be formed by any method, and may be created separately from the sealing material body 9 and attached to the opening-side claw portion 10b.

  As shown in FIGS. 5 to 7, the rotating elastic body 11 abuts against the outer peripheral surface of the insertion opening 5 when the insertion opening 5 is inserted, and the claw portions 10 a and 10 b of the lock body 10 are inserted into the insertion opening 5. Has a function of rotating in a direction away from the outer peripheral surface of the. As shown in FIG. 3A, FIG. 4A, and the like, the rotating elastic body 11 is provided in a state of projecting inward in the tube diameter direction from the opening-side claw portion 10b. Moreover, the elastic body 11 for rotation is in the state where external force does not act, and the cross-sectional shape is from the inner peripheral surface part 9a of the sealing material body 9 to the far side in the tube axis direction as shown in FIG. The amount of protrusion inward in the tube diameter direction increases by a certain amount, and the inclined surface portion 11a that inclines in a straight line, and the thick flat surface portion 11b that follows the inclined surface portion 11a in the tube axis direction rear end side with a thick flat surface shape. Are formed in a trapezoidal cross-sectional shape. In this embodiment, the rotating elastic body 11 is integrally formed with the seal body 9 as described above, but the thickness combined with the seal material body 9 is as shown in FIG. The lock body 10 is formed to have substantially the same thickness toward the inside in the tube diameter direction.

  Further, as shown in FIGS. 3 (a), 3 (b), 4 (b) and the like, the surface on the receiving end side following the distal end portion of the lock body 10 where the opening-side claw portion 10b is formed ( The surface facing the inner side in the pipe radial direction) prevents the claw portion 10b near the opening of the lock body 10 rotated by the rotating elastic body 11 from contacting the outer peripheral surface of the insertion opening 5 when the insertion opening 5 is inserted. A protective material 12 made of a thin rubber plate having a constant thickness (for example, a thickness of 1 mm) that reduces the abutting force is integrally formed with the seal material main body 9. Any method may be used to form the protective material 12, and the protective material 12 may be created separately from the seal material body 9 and attached to the opening-side claw portion 10 b.

  In the above configuration, in a state where the tubes 2 and 4 are not yet joined, that is, in a state where the insertion port 5 is not yet inserted into the receiving port 3, the sealing material 7 is inserted into the sealing material accommodation groove 6 of the receiving port 3. 2 and 5, the valve portion 7b of the sealing material 7 is in a posture that swells greatly inward in the pipe diameter direction. Accordingly, the lock body 10 also has a posture closer to the inner side in the tube radial direction (lower side of the paper surface in FIG. 2 and the like) than when the insertion port 5 described later is inserted, and the claw portions 10a, 10b is the attitude | position which protrudes largely inside the pipe radial direction.

  From this state, when the insertion port 5 is inserted into the receiving port 3 in order to join the tubes 2, 4, first, as shown in FIG. 6, first, the inner surface of the sealing material 7 is placed on the inclined surface 5 a of the insertion port 5. The inner side of the sealing material 7 contacts the outer peripheral surface of the insertion opening 5 as shown in FIG. Here, the claw portions 10a and 10b of the lock body 10 protrude inside the seal material 7, but the claw portion (opening claw portion) 10b of the lock body 10 protrudes further than the claw portion 10b. Since the rotating elastic body 11 is provided, the rotating elastic body 11 comes into contact with the inclined surface 5a and the outer peripheral surface of the insertion slot 5, and the rotating elastic body 11 is also inserted along with the insertion operation of the insertion slot 5. A force is applied in the insertion direction of the mouth 5. Thereby, the lock body 10 of the sealing material 7 is in the e direction, that is, the direction in which the claw portions 10 a and 10 b are separated from the outer peripheral surface of the insertion port 5 in a state where the curved groove portion 10 c is in sliding contact with the receiving port inner surface protruding portion 8. Rotate to. As a result, the claw portions 10a and 10b can be prevented from coming into contact with the outer peripheral surface of the insertion port 5 when the insertion port 5 is inserted, and the outer peripheral surface of the insertion port 5 can be prevented from being damaged by the claw portions 10a and 10b. When inserting the insertion slot 5, it is necessary to compress and deform the sealing material body 9 when the lock body 10 is rotated. Therefore, a certain amount of insertion force is required when inserting the insertion slot 5.

  However, in the above configuration, when the lock elastic body 11 is simply provided with the rotation elastic body 11, the claw portions 10 a and 10 b of the insertion opening 5 are inserted when the insertion opening 5 is inserted by the rotation elastic body 11. Even though the lock body 10 is rotated in the direction away from the outer peripheral surface, the distance between the outer peripheral surface of the insertion port 5 and the receiving port 3 is very small. There is a possibility that the claw portion 10b may come into contact with the outer peripheral surface of the insertion slot 5 at the time of insertion. However, as described above, in addition to providing the elastic body 11 for rotation in the lock body 10, the protective material 12 in the form of a thin plate is provided on the surface on the receiving end portion side following the tip portion of the claw portion 10b. Thus, even in such a case, the protective material 12 contacts the outer peripheral surface of the insertion slot 5, thereby preventing the claw portions 10 a and 10 b of the lock body 10 from coming into contact with the outer peripheral surface of the insertion slot 5. Alternatively, the abutting force can be reduced. Therefore, it is possible to more reliably prevent or minimize the damage to the outer peripheral surface of the insertion slot 5 by the claw portions 10a and 10b when the insertion slot 10 is inserted.

  Further, according to the above configuration, the claw portion (opening claw portion) 10b is removed at the place where the elastic body 11 for rotation is disposed, so that the claw portion 10b remains (is left). ), The lock body 10 is rotated well when the insertion slot 5 is inserted, and the claw portions 10a and 10b are inserted into the insertion slot 5. It can be separated from the outer peripheral surface.

  That is, as shown in FIG. 10A, when the claw portion (opening claw portion) 10b is provided and the tip of the claw portion 10b is disposed so as to cover the rotating elastic body 11, the insertion is performed. When the mouth 5 is inserted, the elastic body 11 for rotation is cut by the claw portion 10b, so that the claw portion 10b is exposed. As a result, the claw portion 10b comes into contact with the outer peripheral surface of the insertion port 5 to cause scratches. If an elastic body such as thick rubber or a hard elastic body is used as the rotating elastic body 11 so as not to be cut by the claw section 10b, the claw section is removed when the insertion port 5 is detached from the receiving port 3. 10b is not caught on the outer peripheral surface of the insertion slot 5, and the separation preventing function becomes defective.

  Further, as shown in FIG. 10B, the surface on the receiving end side (following the tip of the portion where the claw portion 10b is formed, with the claw portion (opening claw portion) 10b being provided ( When the rotation elastic body 11 is placed on the surface facing the inner side in the pipe diameter direction), the rotation elastic body 11 is placed on the surface on the receiving end side of the claw portion 10b when the insertion opening 5 is inserted. And moves in the f direction (outward in the radial direction of the tube) (escapes), the lock body 10 does not rotate, and the claw portion 10b comes into contact with the outer peripheral surface of the insertion slot 5 to cause scratches.

  Further, as shown in FIG. 10 (c), with the claw portion (opening claw portion) 10b being provided, the rotating elastic body 11 is connected to the tip of the tip portion where the claw portion 10b is formed. If it arrange | positions with the attitude | position which can protrude from the surface by the side of an edge part (surface which faces a pipe radial direction inner side) to the front-end | tip part of the nail | claw part 10b, the elastic body 11 for rotation will be inserted into the nail | claw part 10b and an insertion port at the time of insertion. If the insert 5 is inserted into the wedge 5 in the shape of a wedge and an extremely large force is not applied when the insert 5 is inserted, the insert 5 cannot be inserted, and a special jig is required and expensive. Inconveniences such as reduction in workability such as cost of equipment and a long work time occur.

  As described above, if the rotating elastic body 11 is provided with the claw portion (opening claw portion) 10b being provided, the above-described problems occur. However, in the embodiment of the present invention, the rotating elastic body 11 is Since the claw portion 10b is removed at the place where it is disposed, the above-mentioned problems do not occur, and the lock body 10 is rotated well when the insertion port 5 is inserted, and the claw portions 10a, 10b are inserted into the insertion port 5. It is possible to move away from the outer peripheral surface.

  Further, in the present embodiment, as shown in FIGS. 3 and 4, the elastic body 11 for rotation is attached to the tubes 2 and 4 at locations corresponding to the claw portions (opening claw portions) 10 b of the lock body 10. Since the claw portions 10b, which are respectively disposed at both ends of the lock body 10 along the circumferential direction and are provided with the protective material 12, are formed between the elastic bodies 11 for rotation, the insertion of the insertion port 5 Sometimes, the elastic body 11 for rotation is in good contact with the outer peripheral surface of the insertion slot 5 on both sides of the claw portion 10b and the lock body 10 is rotated, and the claw portion 10b is in contact with the outer peripheral surface of the insertion slot 5 and is scratched. This can be prevented well. On the other hand, when the tubes 2 and 4 are about to move away from each other and the insertion port 5 is about to be separated from the receiving port 3, as shown in FIG. Is moved to the receiving opening end side, the lock body 10 rotates in the g direction, and the claw portion 10b of the lock body 10 bites into the outer peripheral surface of the insertion opening 5, thereby preventing the pipes from being separated from each other. Thus, the insertion port 5 is prevented from being detached from the receiving port 3.

  In addition, when the clearance gap between the receiving port 3 and the insertion port 5 is wide (large), as shown to Fig.11 (a), the insertion port 5 is the insertion port 5 from the receiving port 3 trying to move to a detachment | leave direction. When attempting to detach, as shown in FIG. 11 (a), when the elastic body 11 for rotation moves with the insertion port 5 toward the receiving opening end side and the lock body 10 rotates in the h direction. The rear claw portion 10a bites into the outer peripheral surface of the insertion slot 5 instead of the opening-side claw portion 10b of the lock body 10, and the separation of the tubes 2, 4 is prevented. Here, in the lock body 10, the elastic body 11 for rotation and the protective material 12 are not provided in the portion corresponding to the back claw portion 10 a, and thus there is a gap between the receiving port 3 and the insertion port 5. When the insertion port 5 is inserted into the receiving port 3 in order to join the tubes 2 and 4 in a wide (large) case, as shown in FIG. 10 a contacts the outer peripheral surface of the insertion slot 5. However, at this time, the rotation angle (rotation amount) of the lock body 10 in the i direction may be small and the compression amount of the sealing material 7 (sealing material body 9) is small. There is no scratch. As described above, it should be considered that the outer peripheral surface of the insertion port 5 is prevented from being damaged when the gap between the receiving port 3 and the insertion port 5 is narrow. It is only necessary to have the claw portion 10b near the opening that may come into contact with the same (the same applies when there are three or more claw portions).

  Moreover, in the said embodiment, as the elastic body 11 for rotation, the protrusion amount to the pipe radial inside increases from the inner peripheral surface part 9a of the sealing material main body 9 in the cross section to the inner side in the pipe radial direction by a certain amount ( In other words, the case where the inclined surface portion 11a (which increases linearly) is described, but the present invention is not limited to this. 12 (a), 12 (b), and 13 (a) to 13 (c) show an elastic body 11 for rotation according to another embodiment. In this embodiment, the elastic body 11 for rotation is shown. As shown in FIG. 12 (a), the cross section increases from the inner peripheral surface portion of the sealing material body 9 toward the inner side in the tube axis direction so that the amount of increase in the protrusion inward in the tube diameter direction increases (that is, the tube The axial opening side has a slight amount of protrusion and a large amount of increase in protrusion, and has a curved shape (more specifically, the center portion is formed on the lock body 10 as the protrusion amount and the protrusion increase amount increase toward the rear side in the tube axis direction). A curved sloping surface portion 11c that is slanted into a curved shape that is concaved so as to be close to each other, and a thick flat surface portion 11b that smoothly follows the thick-walled portion of the curved slanted surface portion 11c at the end in the tube axis direction. It has a substantially trapezoidal cross-sectional shape. 14 (a), 15 (a), and 16 (a), the distal end portion of the insertion opening 5 is first a thin protruding portion (the curved inclined surface portion 11c of the curved inclined surface portion 11c) when the insertion opening is inserted. It is configured to contact the outer side portion). Although the elastic body 11 for rotation is integrally formed with the seal body 9, as shown in FIG. 13 (a), the thickness combined with the seal body 9 is directed from the lock body 10 toward the inside in the radial direction. In addition, it is formed so as to be thinnest at the central portion of the curved inclined surface portion 11c and thick at the portion of the thick surface portion 11b.

  By the way, in this detachment prevention pipe joint 1, when the insertion port 5 is inserted, the seal member 7 is deformed to rotate the lock body 10 and allow the insertion port 5 to be inserted. Sometimes a relatively large force is required. By providing the elastic body 11 for rotation, it is possible to prevent the outer peripheral surface of the insertion port 5 from being damaged by the claw portions 10a and 10b when the insertion port is inserted, but the outer peripheral surface of the insertion port 5 is rotated when the insertion port is inserted. A larger force is required by the contact of the elastic body 11 for use. That is, as shown in FIG. 4A and the like, as the elastic body 11 for rotation, an inclined surface portion whose protruding amount increases by a certain amount from the inner peripheral surface portion of the seal material main body 9 in the cross section toward the inner side in the tube axis direction. 11a, when the distal end portion of the insertion slot 5 comes into contact with the inclined surface portion 11a of the rotation elastic body 11, the amount of increase in the protrusion of the rotation elastic body 11 is relatively large. A large force is required as the insertion force of the insertion slot 5, and the work efficiency may be lowered, or in some cases, a special joining jig may be required.

  On the other hand, as described above, on the surface located on the inner side (the inner side in the pipe radial direction) of the claw part (opening side claw part) 10b in the elastic body 11 for rotation, the cross-sectional shape is closer to the inner side in the pipe axis direction As shown in FIG. 15 (a), the distal end of the insertion opening 5 is inserted when the insertion opening is inserted by forming the curved inclined surface portion 11c that is inclined so as to increase in the amount of protrusion inward in the radial direction. Since the portion first comes into contact with the thin protruding portion of the curved inclined surface portion 11c of the rotating elastic body 11 (the portion closer to the outside of the curved inclined surface portion 11c), the protruding amount of this portion is small, and then the protruding amount increases smoothly. An increase in the insertion force of the insertion slot 5 can be minimized. Therefore, the workability at the time of inserting the insertion slot 5 can be improved, and a special joining jig is not required and a general joining jig can be used, so that the equipment cost can be reduced. it can.

  The section of the rotating elastic body 11 where the curved inclined surface portion 11c is provided has a curved cross-sectional shape, and the curved inclined surface portion 11c is formed so as to smoothly follow the thick wall surface portion 11b. If the insertion slot 5 is continuously inserted at the time of mouth insertion, the thick wall surface portion 11b eventually comes into contact with the insertion slot and the outer peripheral surface of the insertion slot 5 is damaged by the claw portions 10a and 10b while being smoothly inserted. Can be prevented more reliably.

  Moreover, in the said embodiment shown in FIGS. 3-7, it forms in the thin shape of substantially constant thickness on the surface (inner diameter direction inner side) of the corresponding nail | claw part (opening side nail | claw part) 10b as the protective material 12. FIG. Although the case where it formed was described, it is not restricted to this. 12 to 16 show other embodiments. In this embodiment, the tip of the claw portion (opening claw portion) 10b in which the protection material 12 is disposed in the protection material 12 is shown. A thick portion 12a is provided on the inner surface (inner side in the pipe radial direction) in the vicinity, and the thick portion 12a of the protective material 12 is narrower and smaller than the claw portion 10b (a short length dimension). Is formed. In this embodiment, the case where the thick part 12a and the thin part 12b of the protective material 12 are formed so as to continue smoothly is shown, but the present invention is not limited to this.

  If a protective material 12 having a structure having a simple thickness is used, depending on the shape of the claw portion 10b, the protective function of the protective material 12 may be insufficient, and the claw portion 10b may be inserted during insertion. The outer peripheral surface of the insertion slot 5 may be damaged. In order to cope with this, if the entire protective member 12 is formed thick, it is possible to prevent the outer peripheral surface of the insertion slot 5 from being damaged by the claw portion 10b, but the protective member 12 is stronger than the outer peripheral surface of the insertion opening during insertion. Since it abuts, an extremely large force is required. On the other hand, in this embodiment, the outer peripheral surface of the insertion opening 5 is damaged by the claw portion 10b by forming the thick portion 12a of the protective material 12 with a narrower and smaller dimension than the claw portion 10b. Not only can this be prevented, but since the region where the thick portion 12a is formed is small, the thick portion 12a is easily deformed with a relatively small force, and the increase in the required insertion force of the insertion port 5 during insertion is minimized. To the limit.

  Therefore, even with this configuration, the work efficiency when inserting the insertion slot 5 can be improved, and a special joining jig is not required, and a general joining jig can be used. Can be reduced.

  In the embodiments shown in FIG. 1 to FIG. 9 and FIG. 11 to FIG. 16, the case where the protective material 12 is provided almost to the vicinity of the tip of the claw portion (opening claw portion) 10 b is described. This is not a limitation. FIGS. 17 to 21 show still another embodiment. In this embodiment, the protective material 12 is not provided in the vicinity of the tip of the claw portion (opening claw portion) 10b. As shown in FIG. 17C and the like, the protective material 12 is formed with a gap between the claw portion 10b and the protective material 12.

  In addition, in FIGS. 17-21, although the case where the protective material 12 was not provided only in the location corresponding to the thick part 12a of the protective material 12 was not restricted to this, the nail | claw part 10b is provided. In the region of the full width of the part (that is, the part corresponding to the thick part 12a of the protective material 12 and the thin part 12b on both sides of the thick part 12a), the protective material 12 is provided near the tip of the claw part 10b. It may be configured such that a gap is formed between the claw portion 10b and the protective material 12 without providing a gap.

  As in the embodiment shown in FIGS. 11 to 16, the protective material 12 (in the case shown in FIGS. 11 to 16, the thick portion 12 a of the protective material 12) extends to the tip of the claw portion (opening claw portion) 10 b. If provided, as shown in FIG. 22, in some cases, when the insertion slot 5 is inserted, between the claw part 10 b and the outer peripheral surface of the insertion slot 5, in the vicinity of the tip of the claw part 10 b in the protective material 12. The portion 12 ′ may enter, and the tip portion vicinity portion 12 ′ of the protective material 12 may be cut. At this time, the claw portion 10 b can be prevented from damaging the outer peripheral surface of the insertion slot 5 by the protective material 12, but the protective material 12 is interposed between the claw portion 10 b and the outer peripheral surface of the insertion slot 5 when the insertion port 5 is inserted. When the tip vicinity portion 12 ′ of the protective member 12 enters, a force to cut the tip vicinity portion 12 ′ of the protective material 12 is required, and the outer peripheral surface of the insertion opening of the protective material 12 being cut Since the tip portion vicinity portion 12 ′ that is a contact portion with the tip is dragged while strongly contacting, a large force may be required to insert the insertion slot 5.

  On the other hand, by forming the protective material 12 so as to have a gap S between the claw portion 10b and the protective material 12, when the insertion port 5 is inserted, the claw portion 10b and the outer peripheral surface of the insertion port 5 It is possible to prevent the protective material 12 from entering between them, reduce the force required to insert the insertion slot 5, and improve the work efficiency.

  In the above embodiment, the elastic body 11 for rotation is disposed at both ends in the width direction of the lock body 10, and the claw portion (opening claw portion) 10b provided with the protective material 12 is rotated. The case where the elastic member 11 is formed between the elastic members 11 has been described. However, the present invention is not limited to this. The rotating elastic member 11 is disposed in the center of the lock member 10 in the width direction, and the protective member 12 is provided. You may arrange | position the nail | claw part (opening side claw part) 10b in the width direction both ends of the lock body 10, respectively.

  Further, when the elastic body for rotation 11 and the protective material 12 are formed of the same material as the sealing material body 9 or a material having the same hardness as the sealing material body 9, the sealing material 7 can be formed by integral molding. There is an advantage that can be made, and the manufacture of the sealing material 7 becomes easy. However, the present invention is not limited to this, and the rotating elastic body 11 and the protective material 12 may be formed of a material having a hardness different from that of the seal material body 9 or a different material such as a resin. Thus, when the elastic body 11 for rotation and the protective material 12 are made of a material having a hardness different from that of the seal material main body 9 or a different material, the shape of the elastic body for rotation 11 and the protective material 12 can be freely set. There is an advantage that it can be determined and an optimum design is possible, and in some cases, there is an advantage that it can be produced at a lower cost than the case of forming the same material.

DESCRIPTION OF SYMBOLS 1 Detachment prevention pipe joint 2, 4 Pipe 3 Receptacle 5 Insertion 6 Seal material accommodation groove 7 Seal material 9 Seal material body 10 Lock body 10a Claw part (back claw part)
10b Claw part (opening claw part)
DESCRIPTION OF SYMBOLS 11 Elastic body for rotation 11a Inclined surface part 11b Thick plane part 11c Curved inclined surface part 12 Protective material 12a Thick part 12b Thin part S Crevice

Claims (14)

Used in an anti-separation fitting where an insertion port formed at the end of the other pipe is inserted into the receiving port formed at the end of one of the pipes that are joined together. A sealing material that is disposed in the formed sealing material receiving groove and seals between the insertion port and receiving port by being compressed between the receiving port and the insertion port,
A lock body for preventing detachment is embedded in an annular seal material body that has elasticity and is compressible
The lock body is formed with a claw portion that bites into the outer peripheral surface of the insertion port when the insertion port is about to come out of the receiving port,
The sealing material is provided with a rotating elastic body that abuts the outer peripheral surface of the insertion port when the insertion port is inserted and rotates the lock body in a direction in which the claw portion is separated from the outer peripheral surface of the insertion port. Sealing material with a function to prevent separation.   2. The disengagement preventing function according to claim 1, wherein a plurality of claw portions are formed in the lock body with respect to the axial direction of the tube, and an elastic body for rotation is provided in the vicinity of the claw portion near the opening of the receiving opening. Seal material with.   3. The separation prevention according to claim 1, wherein the rotating elastic body is disposed so as to protrude inward in the tube radial direction at a location where at least a part of the claw portion of the lock body is removed. Functional sealing material.   The rotating elastic body has an inclined surface portion whose cross-sectional shape increases from the inner peripheral surface portion of the seal material main body in the tube axial direction toward the inner side in the tube radial direction by a fixed amount, and the inclined surface portion in the tube axial direction. The sealing material with a separation preventing function according to claim 3, further comprising a thick flat surface portion that continues in a thick flat shape on an end side.   An elastic body for rotation has a curved inclined surface portion that is inclined so as to increase in the amount of protrusion inward in the tube radial direction toward the inner side in the tube axis direction, and the tube axis of the curved inclined surface portion. It has a shape having a thick flat surface portion that smoothly follows a thick portion at the back end portion in the direction, and when the insertion port is inserted, the distal end portion of the insertion port is first disposed so as to contact the thin protruding portion of the curved inclined surface portion. The sealing material with a separation preventing function according to claim 3.   In the lock body rotated by the elastic body for rotation when the insertion port is inserted, the claw portion of the lock body abuts on the outer peripheral surface of the insertion port on the surface of the receiving end portion side following the tip of the claw portion. The sealing material with a separation preventing function according to any one of claims 1 to 5, wherein a protective material for reducing a force to prevent or abut is provided.   The sealing material with a separation preventing function according to claim 6, wherein the protective material is formed in a thin shape with a substantially constant thickness on the surface of the corresponding claw portion on the receiving end side.   The protective material is provided with a thick portion on the inner surface in the pipe radial direction at the vicinity of the tip of the claw portion where the protective material is disposed, and the thick portion of the protective material is narrower than the claw portion. The sealing material with a separation preventing function according to claim 6, wherein the sealing material is formed in a small region.   The protective material according to claim 6, wherein the protective material is formed in a state having a gap between the corresponding claw portions.   A plurality of the lock bodies are disposed with a space in the circumferential direction of the pipe with respect to the annular seal material body, and the elastic body for rotation has both ends in the width direction of the lock body along the circumferential direction of the pipe in the seal material. 10. The detachment according to any one of claims 6 to 9, wherein a claw portion provided at each of the corresponding portions and provided with a protective material is formed between the elastic bodies for rotation. Sealing material with prevention function.   A plurality of lock bodies are arranged at intervals in the circumferential direction of the pipe with respect to the annular seal material body, and the elastic body for rotation is the center of the seal material in the width direction of the lock body along the circumferential direction of the pipe The nail | claw part arrange | positioned by the part corresponding location and provided with the protective material is each arrange | positioned by the both ends with respect to the width direction of a lock body, The any one of Claims 6-9 characterized by the above-mentioned. Sealing material with anti-separation function.   The elastic member for rotation is formed of the same material as the seal material body or a material having the same hardness as the seal material body, The seal with a separation preventing function according to any one of claims 1 to 11 Wood.   The elastic member for rotation is formed of a material different from the seal material body or a material having a hardness different from that of the seal material body, The seal with a separation preventing function according to any one of claims 1 to 11 Wood.   A separation preventing pipe joint comprising the sealing material with a separation preventing function according to any one of claims 1 to 13.

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