JP2011140997A - Sealant with separation preventive function and separation preventing pipe coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealant with the separation preventive function for easily performing joining work of a pipe in a short time, without requiring large force when joining a spigot to a socket. <P>SOLUTION: This sealant 7 arranged in a sealant storage groove 6 of the socket 3 is constituted by embedding a separation preventive lock body 10 in an elastic and compressible sealant body 9, and the sealant storage groove 6 of the socket 3 is formed with a socket inner surface projection part 8 projecting inside in the pipe diameter direction, and the lock body 10 is formed with a claw part 10a biting in an outer peripheral surface of the spigot 5 when the spigot 5 tries to slip out of the socket 3 and a projection part storage recess part 10b capable of storing the socket inner surface projection part 8 when the spigot 5 is inserted into the socket 3 in the sealant storage groove 6 of the socket 3. Thus, only by moving the lock body 10 by a relatively small rotation angle, it becomes an attitude capable of allowing insertion of the spigot 5, so that inserting time force can be reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sealing material with a separation preventing function used for a separation preventing pipe joint for preventing the pipes connected to each other from separating and a separation preventing pipe joint.

  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 function is added to prevent the tubes from separating from each other even if such an unbalance force is applied.

  As a conventional structure for preventing the separation of the pipe, as shown in FIG. 6, a joint (joint part) between a deformed pipe (bent pipe in FIG. 6) 51 and pipes 52 and 53 connected to the deformed pipe 51. 54, a structure covered with a concrete block 55 (referred to as a concrete block structure) is used, and the pipes 52 and 53 and the deformed pipe 51 are integrated with the concrete block 55 in this way, and the pipes 52 and 53 and the deformed form are formed. The separation from the tube 51 is prevented. As another pipe detachment prevention structure, as shown in FIGS. 7 and 8, a lock ring 65 is disposed 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 disposed over the grooves 66 and 67. After the pipes 61 and 62 are joined, the lock ring 65 is inserted into the receiving port 63. A structure is provided in which the lock ring 65 is prevented from being expanded by pressing the inner side of the lock ring 65 by a set bolt 68 penetrating through the lock ring 65, thereby preventing the pipes 61 and 62 from being detached via the lock ring 65. It is used.

  However, when a concrete block structure as shown in FIG. 6 is used, since the concrete block 55 must be completely hardened and then placed in the ground, it takes a long time for the concrete to harden. . Therefore, when it is necessary to restore the road at an early stage, the concrete block structure as shown in FIG. 6 is not adopted, and the structure using the lock ring 65 as shown in FIG. 8 is adopted.

  However, when the lock ring structure as shown in FIG. 8 is used, when fitting the lock ring 65 into the groove 66 of the receiving port 63 while reducing the diameter, a reduction diameter jig and equipment are required. This causes a disadvantage that the cost increases and the fitting operation takes a lot of time.

  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, as shown in FIGS. 10 and 11, a sealing material body 78 having elasticity is disposed in a sealing material housing groove 72 formed on the inner peripheral surface of the receiving port 71. A lock body 73 having a claw 73a formed in the periphery is embedded. Then, due to the non-average force or the like, as shown in FIG. 12, when the tubes try to move in the separation direction (that is, the insertion port 75 tries to move in the c direction relative to the receiving 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 portion 73a of the lock body 73 bites 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). ing.

  Note that a curved groove portion 73 b that abuts the receiving inner surface protrusion 76 formed in the sealing material receiving groove 72 of the receiving port 71 is shallowly recessed with a larger radius of curvature than the receiving port inner surface protruding portion 76. It is formed in a shape. At the time of insertion insertion (at the time of pipe joining), as shown in FIG. 11, a curved groove portion 73 b formed in the lock body 73 is formed on the receiving port inner surface protrusion 76 formed in the sealing material accommodation groove 72 of the receiving port 71. In a state where the lock body 73 is in sliding contact, the lock body 73 as a whole permits the insertion of the insertion opening 75, that is, until the claw portion 73 a of the lock body 73 moves outward from the outer peripheral surface of the insertion opening 75. The seal member main body 78 is rotated in the d direction while being deformed.

  By using this detachment prevention pipe joint structure, as a necessary work for detachment prevention, a seal member 70 with a detachment prevention function in which the lock body 73 is embedded is prepared in advance, and this seal is provided in the receiving port 71. It is only necessary to arrange the material 70. 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. 9 to 12 and the detachment prevention pipe joint disclosed in Patent Document 1, an extremely large force is used as an insertion force when the insertion port 75 is inserted into the receiving port 71 to join the tubes. There is a problem that is necessary.

  That is, when the separation preventing pipe joint shown in FIG. 9 to FIG. 12 or the separation preventing pipe joint disclosed in Patent Document 1 is employed to join the pipes together, it is detached in the sealing material accommodation groove 72 of the receiving port 71. In the state where the sealing material 70 with the preventing function is disposed, the insertion port 75 of the other tube is inserted into the receiving port 71 of one tube. And the receiving port 71 are compressed to generate a repulsive force with respect to the insertion port 75. Therefore, when inserting the insertion opening 75, it is necessary to push the insertion opening 75 while compressing the sealing material body 78 by applying a force exceeding the repulsive force.

  However, since the sealing material body 78 is embedded with a highly rigid locking body 73 made of a metal piece, the locking body 73 is in a posture that allows the insertion port 75 to be inserted while deforming the sealing material body 78. A large force that only tilts (rotates) is required when the insertion opening 75 is inserted. That is, in the detachment prevention pipe joint shown in FIGS. 9 to 12 and the detachment prevention pipe joint disclosed in Patent Document 1, as shown in FIG. 11, when the insertion opening 75 is inserted (at the time of pipe joining), the receiving port 71 is provided. Since the curved groove 73b formed in the lock body 73 is in sliding contact with the receiving-portion inner surface protrusion 76 formed in the sealing material accommodation groove 72, the lock body 73 rotates in its entirety, and therefore the lock body 73 is inserted into the insertion port 75. Must be rotated by a relatively large rotation angle θ1 until the posture allows the insertion of. For this purpose, it is necessary to compress the sealing material main body 78 with an extremely large force, and an extremely large force is required as a force for inserting the insertion port 75 into the receiving port 71.

  Therefore, when the separation preventing pipe joint including the sealing material 70 in which the lock body 73 is embedded is employed, when the pipes are joined to each other, a normal sealing material in which the lock body 73 is not embedded is used. Different from the case of adopting the separation preventing pipe joint, a special joining jig capable of obtaining a large insertion force has been required. As a result, there is a problem that a jig for reducing the diameter is not necessary, but the special joining jig is required, and it is impossible to sufficiently reduce costs such as equipment costs. .

  The present invention solves the above-mentioned problem, and can be easily and quickly joined to a tube, and the separation preventing tube does not require much force when joining the insertion port to the receiving port. An object of the present invention is to provide a joint and a sealing material with a detachment preventing function.

  In order to solve the above-mentioned problems, the sealing material with a detachment preventing function of the present invention has an insertion port formed at the end of the other tube inside the receiving port formed at the end of one of the tubes joined together. Is used in the separation prevention pipe joint, and is arranged in the sealing material receiving groove formed on the inner periphery of the receiving port, and compressed between the receiving port and the inserting port, A sealing material body that is elastic and compressible, and has a structure in which a lock body for detachment prevention is embedded in the lock body. A claw portion that bites into the outer peripheral surface of the insertion opening when trying to come out, and a protrusion that can receive the inner protrusion of the receiving port formed so as to protrude inward in the tube diameter direction in the sealing material receiving groove of the receiving port An accommodation recess is formed.

  According to the above configuration, when the insertion port of the other tube is inserted into the reception port of the one tube, the receiving port inner surface protruding portion of the receiving port can be accommodated in the protruding portion receiving recess of the lock body. Therefore, there is no need to perform the operation of rotating the entire lock body while sliding the lock body against the protrusion on the inner surface of the receiving port as in the prior art. The posture allows the insertion of the mouth. Therefore, the amount of compression of the sealing material main body in which the lock body is embedded at the time of inserting the insertion opening can be reduced, and thus the force at the time of insertion can be reduced.

  In the sealing material with a separation preventing function of the present invention, a plurality of claw portions are formed on the lock body, and at least one claw portion is formed on the back side of the receiving port with respect to the receiving port inner surface protruding portion. A lock that is provided at a location closer to the opening end of the receiving port than the projection on the inner surface of the mouth and that contacts the fitting groove into which the heel portion of the sealing material is fitted, and serves as a fulcrum for the lock body to rotate when the insertion port is inserted A body rotation fulcrum is provided.

  According to the above configuration, the lock body rotation fulcrum is provided at a location closer to the opening end of the receiving port than the receiving port inner surface protrusion, so that the disconnection preventing pipe joint shown in FIGS. Rotation of the lock body as compared to the case where the entire lock body rotates like the joint while sliding in contact with the protrusion on the inner surface of the receiving port, that is, the structure rotating around the place where the protrusion on the inner surface of the receiving port is provided. Even if the angle is small, the moving distance of the claw portion in the insertion thickness direction (tube diameter direction) becomes large. Therefore, only by moving the lock body at a relatively small rotation angle, the posture allows the insertion of the insertion opening, and the amount of compression of the seal material body in which the lock body is embedded can be reduced when the insertion opening is inserted. The force at the time of insertion can be reduced.

  Further, in the sealing material with a detachment preventing function of the present invention, in a state in which the protruding portion receiving recess portion does not insert the insertion opening into the receiving opening, the recessed area closer to the receiving opening is more than the recessed area on the receiving end deep side. Is also formed large.

  According to the above configuration, since the portion closer to the opening of the receiving opening in the protruding portion receiving recess is recessed more greatly, the sealing material receiving groove of the receiving port, the protruding inner surface of the receiving port, the outer peripheral surface of the insertion port, or the like, or Even when there is a manufacturing error of the sealing material or the lock body, the receiving port inner surface protrusion can be satisfactorily accommodated. In other words, if the portion close to the opening of the receiving opening in the projecting portion receiving recess is recessed to a relatively small size, the product dimensional error in the manufacturing process of the receiving opening, the insertion opening, or the sealing material (including the lock body), etc. However, the above-described configuration can minimize the occurrence of such a problem.

  As described above, according to the present invention, the lock inner surface protruding portion can be accommodated in the lock body embedded in the seal material main body when the insertion port is inserted in the seal material receiving groove of the receiving port. As a result of the formation of a concave projection receiving recess, it is possible to reduce the force at the time of insertion and eliminate the need for a special joining jig to obtain a large insertion force. In addition, it is possible to reduce costs such as equipment costs and improve work efficiency in pipe joining work.

  In addition, by providing a lock body rotation fulcrum that serves as a fulcrum for the lock body to rotate when the insertion port is inserted closer to the opening end of the reception port than the protrusion on the inner surface of the reception port, the force during insertion of the insertion port is reduced. This eliminates the need for a special joining jig. As a result, it is possible to reduce costs such as equipment costs and improve work efficiency in pipe joining work.

(A) is sectional drawing which shows the detachment prevention pipe joint provided with the sealing material with a detachment preventing function according to the embodiment of the present invention, (b) is an enlarged sectional view of the main part of the sealing material with the detachment preventing function. It is a principal part expanded sectional view of the same detachment prevention pipe joint, and shows a state immediately before the insertion port is inserted into the receiving port. It is a principal part expanded sectional view of the separation prevention pipe joint, and shows the state where the insertion slot is inserted into the receiving slot. 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. It is a figure which shows schematically the conventional detachment | leave prevention structure (concrete block 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 disconnection prevention pipe joint, and shows the state just before inserting an insertion port into a receptacle. It is a principal part expanded sectional view of the conventional separation prevention pipe joint, and shows the state which inserted the insertion slot into the receptacle. 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 sealing material with a separation preventing function according to an embodiment of the present invention and a separation preventing pipe joint including the sealing material with a separation preventing function will be described with reference to the drawings. 1 (a), 2, 3, and 4 are cross-sectional views of a separation preventing pipe joint including a sealing material with a separation preventing function according to an embodiment of the present invention, and FIG. FIG. 3 shows a state immediately before the insertion port is inserted, FIG. 3 shows a state where the insertion port is inserted into the receiving port, and FIG. 4 shows a state when the insertion port tries to detach from the receiving port. FIG. 1B is an enlarged cross-sectional view of the main part of the sealing material with the separation preventing function, and FIG. 5 is a front view of the sealing material with the separation preventing function.

  As shown in FIGS. 1 to 3, the detachment prevention pipe joint 1 according to the embodiment of the present invention includes the other pipe inside the receiving port 3 formed at the end of one pipe 2 to be joined to each other. 4 is inserted, and the sealing material accommodation groove formed on 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). 6 is provided with an annular sealing material 7, 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 formed so that it might become so thin that 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 FIGS. 1 (a), 1 (b), 2 and the like, the sealing material 7 includes a heel portion 7a that holds the sealing material 7 in a predetermined position in the sealing material accommodation groove 6 and an insertion port. The valve portion 7b for sealing is integrated with the valve portion 7b. As shown in FIG. 2, the valve portion 7b has a substantially circular cross section (or a substantially oval cross section) when not receiving external force. 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.

  Furthermore, between the fitting groove 6a and the valve portion housing groove 6b in the sealing material housing groove 6 of the receiving port 3, a receiving port inner surface protruding portion 8 protruding inward in the pipe diameter direction is formed. In this embodiment, the tip of the receiving inner surface protrusion 8 has a substantially semicircular cross section, but the shape is not limited to this.

  As shown in FIG. 1A, FIG. 2, and the like, the sealing material 7 is formed of a material having high rigidity such as a metal piece on an annular sealing material body 9 made of rubber that has elasticity and can be compressed. As shown in FIG. 5, a plurality of the locking members 10 for preventing separation are embedded at intervals in the circumferential direction. In addition, in this embodiment, although the case where the eight lock bodies 10 are arrange | positioned at equal intervals in the circumferential direction is illustrated, it is not restricted to this, The number of the lock bodies 10 can be increased / decreased, In accordance with this, the arrangement interval may be changed.

  As shown in FIG. 4, 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. The claw portion 10a that bites into the outer peripheral surface of 5 and the sealing material of the receiving port 3 when the insertion port 5 is inserted into the receiving port 3 and the tubes 2 and 4 are joined to each other as shown in FIGS. In the housing groove 6, a projection housing recess 10 b capable of housing the receiving port inner surface projection 8 is formed.

  The claw portion 10a is formed so as to line up with respect to the tube axis direction in a posture that protrudes obliquely to the inner side of the seal material 7 from the lock body 10, more specifically, to the back side of the receiving port 3 and the inner side in the tube radial direction. ing. In this embodiment, the claw portion 10a is formed such that one claw portion 10a is formed on the back side of the receiving port 3 with respect to the tube inner surface protruding portion 8 with respect to the tube axis direction, and the other claw portion 10a. Is formed at substantially the same position as the inner tip of the receiving port inner protrusion 8. Moreover, in this embodiment, although the case where the two claw parts 10a are formed in each lock body 10 is shown, one or three or more claw parts 10a may be formed. In addition, when only one nail | claw part 10a is formed, when the clearance gap between the receiving port 3 and the insertion port 5 is fluctuate | varied largely, the nail | claw part 10a may not bite well, It is preferable to provide a plurality.

  The protrusion housing recess 10b of the lock body 10 is formed to be slightly larger than the substantially semicircular shape on the inner side of the seal member 7, more specifically, on the outer side in the tube radial direction of the lock body 10, on the inner side in the tube radial direction. Yes. Then, as shown in FIGS. 1B and 2, in the state in which the protruding portion receiving recess 10 b does not insert the insertion port 5 into the receiving port 3, the recessed area closer to the receiving port opening is the receiving back side. It is formed larger than the recessed area. Further, in this embodiment, a recessed portion 10 b ′ that is recessed deeper than the shape of the corresponding receiving port inner surface protruding portion 8 is formed in the portion closer to the receiving port opening in the protruding portion receiving recess portion 10 b.

  As shown in FIGS. 2 and 3, the lock body 10 of the seal member 7 is configured such that when the insertion port 5 is inserted into the receiving port 3, the receiving port inner surface protruding portion 8 of the receiving port 3 becomes the protruding portion receiving recess 10 b. The lock body rotation fulcrum 10c, which is a fulcrum for rotating the lock body 10 at this time, rotates closer to the accommodated b direction (see FIG. 3). It is provided in the place. Specifically, the lock body rotation fulcrum 10 c is provided in a fitting groove 6 a that is provided near the opening end of the receiving port 3 than the receiving port inner surface protruding portion 8 in the receiving port 3 and into which the heel portion 7 a of the sealing material 7 is fitted. In the contact portion, in this embodiment, the contact portion is provided at the connection portion with the receiving-portion inner surface protrusion 8 in the fitting groove 6a.

  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. Since it is only attached, the valve portion 7b of the sealing material 7 is in a posture that swells greatly inward in the pipe radial direction, as shown in FIGS. 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 portion 10a is It is a posture that protrudes greatly inward in the tube diameter direction and that the receiving port inner surface protruding portion 8 of the receiving port 3 is detached from the protruding portion receiving recess portion 10b.

  From this state, when the insertion port 5 is inserted into the receiving port 3 in order to join the tubes 2, 4, first, the lock body 10 of the sealing material 7, and the claw portion 10 a is the inclined surface of the insertion port 5. It moves to the attitude | position (it becomes an attitude | position which can introduce | transduce the inclined surface 5a of the insertion port 5) along 5a, and the valve part 7b of the sealing material 7 is also along the inclined surface 5a of the insertion port 5 after that, and the receiving port 3 and the insertion port 5 Compressed between. When the insertion port 5 is further inserted, the locking body 10 of the sealing material 7 moves so that the claw portion 10a gets over the inclined surface 5a of the insertion port 5, and the valve portion of the sealing material 7 7b is further compressed between the outer peripheral surface of the insertion port 5 and the receiving port 3 (see FIG. 3).

  In this case, the lock body 10 has a protrusion receiving recess 10b that can receive the receiving port inner protrusion 8 when the insertion port 5 is inserted into the receiving port 3 in the sealing material receiving groove 6 of the receiving port 3. Therefore, the lock body 10 does not rotate the entire lock body 10 but rotates in the b direction around the lock body rotation fulcrum 10c without contacting the receiving port inner protrusion 8. can do. Further, since the lock body rotation fulcrum 10c is provided closer to the opening end of the receiving port 3 than the receiving port inner surface projection 8, the locking member as shown in FIGS. Compared to the case where the entire body 73 is rotated while being in sliding contact with the receiving surface inner protrusion 76, that is, the entire locking body 73 is rotated around the position where the receiving surface inner surface protrusion 76 is provided (rotation angle θ1). Even if the rotation angle θ2 of the lock body 10 is small, the moving distance of the claw portion 10a in the insertion thickness direction (tube diameter direction) becomes large. Therefore, the lock body 10 has a posture in which the insertion of the insertion slot 5 can be permitted only by moving by a relatively small rotation angle θ2 around the lock body rotation fulcrum 10c. At this time, the lock body 10 rotates while compressing the seal material main body 9, but the rotation angle θ <b> 2 of the lock body 10 may be small, and therefore the seal material main body in which the lock body 10 is embedded at the time of insertion. The compression amount (deformation amount) 9 can be reduced, and as a result, the force when inserting the insertion slot 5 can be reduced.

  As a result, the insertion operation of the insertion slot 5 can be performed without using a special joining jig capable of obtaining a large insertion force, and costs such as equipment costs can be reduced. The time required for the insertion work can be reduced and the work efficiency can be improved.

  Moreover, according to said structure, in the state which the protrusion accommodating hollow part 10b of the lock body 10 does not insert the insertion port 5 in the receiving port 3, the recessed area near the receiving port opening is a hollow in the receiving port back side. The portion closer to the receiving opening is formed to be larger than the area, and the portion closer to the receiving opening is further recessed, and in this embodiment, the receiving opening corresponding to the portion near the receiving opening in the protruding portion receiving recess 10b is provided. Since the concave portion 10b ′ is formed so as to be deeper than the shape of the inner surface protrusion 8, the sealing material receiving groove 6 and the inner surface protrusion 8 of the receiving port 3, the outer peripheral surface of the insertion port 5, or the sealing material 7 or the lock body 10 due to a manufacturing error or the like, even if the receiving surface inner protrusion 8 of the receiving port 3 comes into contact with the protruding portion receiving recess 10b when the insertion port is inserted, the locking body 10 protrusion housing recesses 10b are easily expanded so that the recesses are larger, and the inner surface of the receiving port The part 8 can be satisfactorily accommodated. That is, if the portion closer to the opening of the receiving portion in the protruding portion receiving recess 10 is recessed relatively small, the manufacturing process of the receiving port 3, the insertion port 5, or the sealing material 7 (including the lock body 10). When the insertion-portion inner-surface projection 8 of the receptacle 3 comes into contact with the projection-receiving recess 10b when the insertion port is inserted, the projection-receiving recess 10b of the lock body 10 is difficult to expand. For this reason, it is impossible to satisfactorily accommodate the receiving-portion inner-surface protrusion 8 and eventually the lock body 10 as a whole must be rotated at a large rotation angle, which may require a large insertion force. Thus, the occurrence of such problems can be minimized.

DESCRIPTION OF SYMBOLS 1 Detachment prevention pipe joint 2, 4 Pipe 3 Receptacle 5 Insertion 6 Seal material accommodation groove 7 Seal material 8 Receptacle inner surface protrusion 9 Seal material main body 10 Lock body 10a Claw part 10b Protrusion accommodation hollow part 10b 'recessed part 10c Lock Body rotation fulcrum

Claims (4)

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. It is disposed in the formed sealing material receiving groove, and is a sealing material for preventing detachment that seals between the insertion port and receiving port by being compressed between the receiving port and the insertion port,
It has a structure in which a lock body for preventing separation is embedded in an elastic and compressible sealing material body,
The lock body is formed so as to protrude into the inner diameter in the pipe radial direction in the sealing member receiving groove of the receiving port, and a claw portion that bites into the outer peripheral surface of the receiving port when the insertion port tries to come out from the receiving port A seal material with a detachment preventing function, characterized in that a projecting portion recess portion capable of storing the projected inner surface of the receiving port is formed.   A plurality of claw portions are formed on the lock body, at least one claw portion is formed on the back side of the receiving port with respect to the inner surface of the receiving port, and a location closer to the opening end of the receiving port than the inner surface of the receiving port at the receiving port A lock body rotation fulcrum that is a fulcrum for rotating the lock body when the insertion port is inserted is provided at a position that contacts the fitting groove into which the heel portion of the sealing material is fitted. The sealing material with a separation preventing function according to claim 1.   The protrusion housing recess is formed so that a recessed area closer to the opening of the receiving opening is formed to be larger than a recessed area on the back of the receiving opening when the insertion opening is not inserted into the receiving opening. The sealing material with a separation preventing function according to 1 or 2.   A separation preventing pipe joint comprising the sealing material with a separation preventing function according to any one of claims 1 to 3.

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