JP2007292281A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint capable of easily and rapidly connecting a female member having a socket part to a male member having an insert-side tip part to be inserted to the socket part in a stopped state without using a nut (pressing ring) as in a conventional pipe joint. <P>SOLUTION: The pipe joint comprises the female member 2 having the socket part 10 to be relatively rotatably inserted and connected; the male member 1 having the insert-side tip part 5; a seal ring 4 interposed between the overlapping faces of the socket part 10 and the insert-side tip part 5; and a stopper ring 3. The male member includes a stopping groove 7 circumferentially provided on the outer circumference of the insert-side tip part 5. The female member includes a stopper ring housing recessed groove 11 provided on the outer circumference of the socket part 10, and a claw insert hole 12 provided on the groove bottom thereof. The stopper ring 3 is formed in an expansible and contractible C-shape having a plurality of stopping claws 9 protrusively provided on the inner circumference and fitted into the stopper ring housing recessed groove 11, and tip portions 9a of the sopping claws 9 are protruded into the socket part 10 through the claw insert hole 12 and engaged with the stopping groove 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pipe joint used for piping such as water / hot water supply, cold / hot water, and cooling water, and connecting one end of the piping to an instrument such as a water tap.

  For example, a pipe joint as shown in FIG. 28 has been proposed as a pipe joint used for piping such as water supply and hot water supply (see, for example, Patent Document 1). This pipe joint includes a joint body 31 that can be connected to an appliance such as a water tap and has an opening 30 at one end, and a resin short pipe that is inserted into the opening 30 of the joint body 31 (in Patent Document 1). 32, a nut 34 that is screwed into a male screw 33 provided on the outer periphery of the receiving portion 30 of the joint body 31, an inner periphery of the opening end of the receiving portion 30, and a resin. A washer 35, an O-ring 36, and an annular leaf 37 are provided between the short pipe 32 and the outer periphery.

  When constructing the pipe joint in the field, first, the joint body 31 is connected to an apparatus such as a water faucet, and a washer 35, an O-ring 36, an annular leaf 37, and a nut 34 are inserted into the resin short pipe 32 in this order. In addition, after inserting the water supply pipe P into the resin short pipe 32 and adhesively bonding it, the distal end of the resin short pipe 32 is connected to the receiving part 30 of the joint body 21 in the receiving part 30. The nut 34 is inserted until it comes into contact with the stopper rib 38, and the nut 34 is fastened to the joint body 31.

JP 2003-227589 A

  However, the above-described pipe joint has a problem in tightening management in that it is difficult to confirm the insufficient tightening of the nut 34 after completion of construction on site. For this reason, when the tightening of the nut 34 is loosened due to vibration, an external load, or the like, water in the water supply pipe P may leak. In addition, due to the structure in which the nut 34 is fastened to the joint body 31, polygonal tool hanging portions 31 a and 34 a such as hexagons and octagons are formed on the outer circumference of the joint body 31 and the outer circumference of the nut 34 even if the nominal diameter is small. Therefore, the joint main body 31 and the nut 34 are increased by that amount, leading to an increase in material costs and an increase in the size of the joint as a whole.

  The present invention has been made to solve such problems, and the object of the present invention is to reduce the cost and size by omitting the use of a nut (push wheel) like the conventional pipe joint described above. The assembly workability can be improved by eliminating the tightening work of the nut, and the problem of loosening of the nut after installation can be solved, and the occurrence of water leakage accidents can be surely prevented and reliability is improved. It is to provide a pipe joint with high height.

The pipe joint of the present invention is a male member having a female member having a receiving portion at least at one end and an insertion-side tip portion inserted into the receiving portion of the female member, as described in claim 1. And a seal ring interposed between the overlapping surfaces of the receiving part and the insertion-side tip part, and a stopper ring mounted on the outer periphery of the receiving part, wherein the male member Is provided with a retaining groove in the circumferential direction on the outer periphery of the insertion-side tip, and the stopper ring is formed in a C shape having both open ends and is elastically expandable and deformable, and the ring body A stopper ring in which the stopper ring is fitted on the outer periphery of the receiving portion. Set the receiving groove to correspond to the outer periphery of the retaining groove. A claw insertion hole is provided in the groove bottom of the stopper ring housing concave groove to allow the stopper claw of the stopper ring to pass therethrough and the tip of the claw to protrude inward of the receiving portion, A tip of the retaining claw protruding from the claw insertion hole is characterized in that it is engaged with the retaining groove.
According to such a configuration, the distal end portion of the stopper ring retaining pawl is formed by inserting the insertion side distal end portion of the male member into the receiving portion of the female member and fitting the stopper ring into the stopper ring receiving groove. Since it engages with the retaining groove, the female member and the male member can be simply and quickly connected to each other in a retaining shape and in a sealing manner.

  The pipe joint according to claim 1 may be configured such that the insertion-side distal end portion of the male member is inserted into the receiving portion of the female member so as to be relatively rotatable.

  In the pipe joint according to claim 1 or 2, as in claim 3, the stopper ring can be removably fitted into the stopper ring receiving concave groove. According to this, even after the male member and the female member are once connected, the stopper ring can be artificially removed from the stopper ring receiving concave groove, and the male member and the female member can be removed by detaching the stopper ring. Can be separated and connected easily and quickly.

  The pipe joint according to any one of claims 1 to 3, wherein the pipe joint is formed on one side surface of a tip end portion of the stopper claw of the stopper ring in a mounted state of the stopper ring. A slide slope that allows insertion of the insertion-side tip of the male member can be formed in the portion. According to this, even after the stopper ring is mounted in the stopper ring-accommodating groove of the female member, the receiving portion of the female member can be inserted into the insertion-side distal end portion of the male member with one touch.

  The pipe joint according to any one of claims 1 to 4, wherein the male member is a straight type, elbow type or tee type socket, while the female member is made of resin. The male member is a resin short tube while the female member is a straight type, elbow type or tee type socket as in claim 6, or further according to claim 7. As described above, both the male member and the female member can be straight, elbow, or tee sockets.

  As for the pipe joint of Claim 5 or 6, the one end part of the resin pipe can be joined to the resin short pipe as described in Claim 8. According to this, in combination with the fact that the male member and the female member are inserted so as to be capable of relative rotation as described in claim 2, the water faucet even after the resin tube is joined to the resin short tube A straight type, elbow type, or tee type socket can be screwed into an instrument such as a valve, a pipe, or a pipe joint, and the straight type, elbow type, or tee type socket can be easily attached by this screwing.

  According to a third aspect of the present invention, the pipe joint according to the ninth aspect may be configured such that both open end portions of the stopper ring protrude from the outer peripheral surface of the receiving portion. According to this, a stopper ring can be easily removed by putting a finger on both ends of the separation and pushing the both ends of the separation apart.

  According to a third aspect of the present invention, the pipe joint according to the tenth aspect may be provided with a protrusion on a part of the outer periphery of the ring body of the stopper ring. According to this, the stopper ring can be easily removed by pinching the protrusion and pulling out the stopper ring. In this case, as described in claim 11, if the both open ends of the stopper ring are brought close to or in contact with the groove end walls at both ends in the stopper ring receiving concave groove, the finger is placed on the finger hooking projection. The stopper ring can be easily removed from the stopper ring receiving groove by rotating the stopper ring in the direction toward the groove end wall with one open end contacting the groove end wall. Can do.

The pipe joint according to any one of claims 1 to 9, wherein, as described in claim 12, the outer periphery of the female member is covered with a cylindrical socket cover so as to cover the outer periphery of the ring body. Can be fitted.
Thus, the socket cover that is covered and fitted to the outer periphery of the female member prevents the stopper ring from accidentally coming off the stopper ring receiving groove due to some external force or internal pressure, and the female member or male member. When a pulling force is applied to the stopper ring, the stopper ring also exerts a reinforcing function that suppresses torsional deformation in the stopper ring receiving concave groove. Thereby, the connection state of the female member and male member by a stopper ring can be maintained.
Further, the socket cover can be fitted into the female member only when the stopper ring is fitted into the stopper ring receiving groove as prescribed, and the stopper ring temporarily protrudes partially into the stopper ring receiving groove. If the socket cover is not fitted as prescribed, the socket cover cannot be fitted to the female member. Therefore, it can be easily confirmed whether or not the stopper ring is fitted into the stopper ring receiving concave groove according to whether or not the socket cover can be fitted to the female member.

  According to a twelfth aspect of the present invention, as in the thirteenth aspect, an inward flange that comes into contact with and engages with one end surface of the female member is provided at the opening end of the socket cover in the axial direction. it can. According to this, the socket cover can be easily and surely attached to the female member by fitting the socket cover to the female member until the inward flange comes into contact with one end surface of the female member. Therefore, the inward ridge can exhibit a positioning function with respect to the female member of the socket cover.

In a pipe joint according to a thirteenth aspect, as described in the fourteenth aspect, an annular rib can be provided on the outer periphery of the female member or the male member so that the inward flange is engaged in a retaining shape. According to this, it is possible to prevent the socket cover from coming out of the female member, and it is possible to maintain the stopper ring detachment preventing function and the reinforcing function by the socket cover.
In this case, the pipe joint according to the fourteenth aspect can form a notch in the inner peripheral edge of the inward-facing bar as described in the sixteenth aspect. According to this, when the socket cover is fitted to the outer periphery of the female member, the inward ridges easily get over the annular rib due to elastic deformation.

In the pipe joint according to any one of claims 12 to 14, as described in claim 15, the socket cover can be formed to be transparent or translucent. According to this, even after the socket cover is fitted, it is possible to easily see through whether or not the stopper ring is attached from the outside of the socket cover.

The pipe joint according to any one of claims 1 to 16, as described in claim 17, has a groove-like shape in which one side surface in the retaining groove of the male member is gradually widened inward. Formed and formed on the other side surface of the tip end portion of the stopper claw of the stopper ring can be an expansion preventing slope having a shape that fits on one side surface of the dovetail shape. According to this, when a pulling force is applied to the female member or the male member due to some external force or force due to internal pressure, the stopper ring can be prevented from expanding and deforming in the diameter increasing direction, whereby the stopper ring of the stopper ring can be prevented. It is possible to prevent detachment from the housing concave groove.

  According to the present invention, the insertion end of the male member is inserted into the receiving portion of the female member, and the male member and the female member are prevented from being pulled out by fitting the stopper ring into the stopper ring receiving groove. And can be connected in a seal-like manner, and a nut (press ring) having a polygonal tool hook like the conventional pipe joint described above can be omitted, thus reducing costs, downsizing, and downsizing. It is possible to omit the tightening work of the nut, and the simple work of inserting the resin short pipe, which is a female member, into the receiving part of the male member is sufficient. The problem of loose nuts and insufficient tightening can be solved and the occurrence of water leakage accidents can be reliably prevented.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of a pipe joint according to one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a front view of a stopper ring of the pipe joint of FIG. FIG. 5 is a sectional view taken along line BB in FIG. 3, and FIG. 5 is a sectional view showing an assembly process of the pipe joint of FIG.

  As shown in FIG. 1, the pipe joint according to the present invention mainly includes a straight male socket 1 that is a male member, a resin short pipe 2 that is a female member, a stopper ring 3, and a seal ring 4. A member.

  As shown in FIG. 1, the straight male socket 1 has an insertion-side distal end portion 5 at one end thereof, and an annular seal ring receiving recess in which a seal ring 4 is accommodated on the outer periphery of the insertion-side distal end portion 5. A groove 6 and an annular retaining groove 7 arranged side by side in the axial direction from the seal ring receiving groove 6 are provided. On the outer periphery of the other end of the male socket 1, a male screw 8 that can be screwed into an instrument such as a water tap or a valve is provided. A polygonal tool hook portion 1 a is provided on the outer periphery of the intermediate portion between the insertion-side distal end portion 5 and the male screw 8 of the male socket 1.

  As shown in FIG. 3 and FIG. 4, the stopper ring 3 is formed of a resin or metal material in a C shape having open ends 3b, 3b and is elastically expandable / deformable, and the ring body 3a. It is formed in a shape having a plurality of (three in the illustrated example) retaining claws 9 projecting integrally inwardly on the inner periphery.

  As shown in FIGS. 1 and 2, the resin short tube 2, which is a female member, is formed into a short tube with a resin material such as polybutene, polyethylene, or vinyl chloride. One end of the resin short tube 2 has a receiving portion 10 that allows the insertion-side distal end portion 5 of the male socket 1 to be inserted in a relatively rotatable manner. A stopper ring 3 is removed from the outer periphery of the receiving portion 10. A stopper ring receiving groove 11 is provided to be fitted. A claw insertion hole 12 corresponding to the retaining claw 9 of the stopper ring 3 is provided in the groove bottom of the stopper ring receiving concave groove 11. The inner diameter of the opening at the other end of the resin short tube 2 is a resin tube P made of a resin material such as polybutene, polyethylene, or vinyl chloride, as shown by a two-dot chain line in FIG. One end of each is inserted so that it can be joined by heat fusion or electric fusion. As a means for joining the resin short pipe 2 and the resin pipe P, an adhesive means can be used in addition to the heat fusion / electric fusion.

  Thus, when the stopper ring 3 is fitted into the stopper ring receiving groove 11 of the resin short tube 2, the retaining claw 9 of the stopper ring 3 is inserted into the claw insertion hole 12, and the distal end portion 9 a of the retaining claw 9 is While projecting into the receiving portion 10, the outer peripheral surface of the ring body 3 a of the stopper ring 3 is stored so as to be flush with or substantially flush with the outer peripheral surface 10 a of the receiving portion 10. When the insertion-side distal end portion 5 of the male socket 1 is inserted into the receiving portion 10 of the resin short tube 2 to a predetermined depth, the stopper ring-receiving concave groove 11 corresponds to the outer periphery of the retaining groove 7 and the nail The leading end 9 a of the retaining claw 9 protruding from the insertion hole 12 is configured to engage with the retaining groove 7.

  The seal ring 4 is an O-ring or the like. One or two seal rings 4 are provided so that the outer diameter of the seal ring receiving groove 6 of the insertion-side tip 5 of the male socket 1 protrudes from the outer peripheral surface of the insertion-side tip 5. More than one piece is stored side by side.

Next, the assembly procedure of the pipe joint will be described with reference to FIGS. 5 (a), (b), and (c).
First, as shown in FIG. 5A, the seal ring 4 is accommodated in the seal ring accommodation concave groove 6 of the insertion side distal end portion 5 of the male socket 1. Next, as shown in FIG. 5B, the insertion-side distal end portion 5 of the male socket 1 is inserted into the receiving portion 10 of the resin short tube 2 or the receiving portion 10 of the resin short tube 2 is inserted. Insert into the distal end 5 of the insertion side of the male socket 1. As a result of the insertion, the seal ring 4 is compressed between the inner peripheral surface of the receiving portion 10 of the resin short tube 2 and the outer periphery of the insertion-side tip portion 5 of the male socket 1, and there is a sealed state without water leakage therebetween. can get.

  After that, when the stopper ring 3 is once expanded and fitted into the stopper ring receiving groove 11 of the resin short tube 2 as shown in FIG. 3C, the stopper ring 3 is contracted by the elastic restoring action. The retaining claw 9 of the ring 3 is inserted into the claw insertion hole 12, and the distal end portion 9 a of the retaining claw 9 protrudes inward of the receiving portion 10 and engages with the retaining groove 7 of the male socket 1. By this engagement, a state is obtained in which the resin short tube 2 is prevented from being removed from the insertion-side distal end portion 5 of the male socket 1.

  If even one of the retaining claws 9 is not inserted into the claw insertion hole 12, the stopper ring 3 is lifted from the outer peripheral surface 10a of the receiving portion 10, so that this can be easily observed, and the stopper ring 3 A mounting failure can be easily confirmed.

  Since the resin short tube 2 can rotate relative to the male socket 1 in this assembled state, even after the resin tube P for water supply is joined to the resin short tube 2 as shown in FIG. One male screw 8 can be screwed into a water faucet, a valve or the like or a tube, or another pipe joint (not shown), and the male socket 1 can be easily attached to the device. Incidentally, when the resin short tube 2 and the male socket 1 rotate relative to each other, the distal end portion 9 a of the retaining claw 9 slides in the retaining groove 7.

  As described above, according to the state in which the retaining claw 9 of the stopper ring 3 is engaged with the retaining groove 7 of the male socket 1, the resin short tube 2 together with the resin tube P is applied by an external force such as an earthquake after construction. Even if the pulling direction is strongly pulled, it is possible to reliably prevent the resin short tube 2 from coming out of the insertion side tip 5 of the male socket 1.

  Even after the male socket 1 and the resin short tube 2 are once connected, the fingertips are placed on the open ends 3b and 3b of the stopper ring 3 that are facing each other in the stopper ring receiving groove 11 as shown in FIG. Since the stopper ring 3 can be removed from the stopper ring receiving groove 11 by expanding the stopper ring 3, the male socket 1 and the short resin pipe 2 can be separated and connected easily and quickly.

  In the above embodiment, the male socket 1 and the resin short tube 2 are inserted and connected, and then the stopper ring 3 is fitted into the stopper ring receiving groove 11 of the resin short tube 2. The stopper ring 3 is fitted in the stopper ring receiving groove 11 of the resin short tube 2 in advance, and then the insertion-side tip portion 5 of the male socket 1 is inserted into the receiving portion 10 of the resin short tube 2. Alternatively, the receiving portion 10 of the resin short tube 2 can be inserted into the insertion-side distal end portion 5 of the male socket 1 so that the male socket 1 and the resin short tube 2 can be connected in a sealing manner and a retaining shape. It can also be done. For this purpose, as shown in FIGS. 1, 3, and 4, a slide slope 13 may be formed on one side surface of the distal end portion 9 a of the retaining claw 9 of the stopper ring 3. As a result, the sliding slope of the stopper ring 3 as the receiving portion 10 of the resin short tube 2 is inserted into the distal end portion 5 of the male socket 1 with the stopper ring 3 mounted in the stopper ring receiving groove 11. 13 slides on the insertion-side distal end portion 5 to allow the stopper ring 3 to be expanded and to be inserted, and after insertion, the stopper ring 3 is reduced by an elastic restoring action so that the distal end portion 9a of the retaining claw 9 is retained in the retaining groove. 7 is engaged. Therefore, the male socket 1 and the resin short tube 2 can be connected with one touch.

  In the above embodiment, as a means for removing the stopper ring 3 from the stopper ring receiving groove 11, the stopper ring receiving groove 11 is provided over the entire outer peripheral surface of the receiving portion 10 as shown in FIG. The stopper ring 3 is in a state of facing the inside of the stopper ring 3 so as to be taken out by both hands, but other removal means such as the following may be employed.

  As shown in FIG. 8 (a), the stopper ring receiving groove 11 is formed on the outer periphery of the receiving portion 10 to a length corresponding to the peripheral length of the stopper ring 3, and is formed at both ends in the stopper ring receiving groove 11. Groove end walls 11a and 11a are provided so that the open ends 3b and 3b of the stopper ring 3 are close to or abut on the groove end walls 11a and 11a. Thus, a part of the outer peripheral surface of the opening both ends 3b, 3b is protruded from the outer peripheral surface of the receiving portion 10 in order to make it easy to touch the opening both ends 3b, 3b of the stopper ring 3. According to this, the stopper ring 3 can be easily detached from the stopper ring receiving groove 11 by spreading the stopper ring 3 as shown in FIG.

  Further, as shown in FIG. 9A, similarly to the above case, a stopper ring receiving groove 11 is formed on the outer periphery of the receiving portion 10 to a length corresponding to the peripheral length of the stopper ring 3, and the stopper Groove end walls 11a and 11a are provided at both ends in the ring receiving groove 11, so that the open ends 3b and 3b of the stopper ring 3 are close to or abut against the groove end walls 11a and 11a. In addition, a finger hooking protrusion 19 is provided on a part of the outer periphery of the ring body 3a of the stopper ring 3. When this is the case, place a finger on the finger-hooking projection 19 and bring the stopper ring 3 into contact with the open end 3b of the groove end wall 11a as shown in FIG. By rotating in the direction toward the groove end wall 11a (in the direction of arrow M), the stopper ring 3 can be easily detached from the stopper ring-receiving concave groove 11 with one touch. In this case, a taper 9b having a taper at the center retaining claw 9 is attached so that the retaining claw 9 can be smoothly removed from the claw insertion hole 12 by rotating the stopper ring 3, and the retaining claw 9 is inserted. The claw insertion hole 12 is preferably formed as a long hole that is long in the circumferential direction.

  In the above-described embodiment, the case where the other end of the straight male socket 1 is connected to an instrument or the like has been described, but the other end of the male socket 1 has the same insertion side as the insertion-side tip 5 on one end. By providing a distal end portion and inserting and connecting this insertion side distal end portion similarly to the receiving portion 10 of the resin short tube 2 having the same configuration as the resin short tube 2 inserted and connected to one end side of the male socket 1. Also, it is possible to provide a pipe joint in a form in which the resin pipes P to be joined to the resin short pipes 2 at both ends are connected to each other.

  Moreover, in the said Example, the resin-made short tube 2 which has the receptacle part 10 is made into a female type member as the female member which has the receptacle part 10 inserted and connected mutually, and the male type member which has the insertion side front-end | tip part 5. FIG. On the other hand, the straight male socket 1 having the insertion-side distal end portion 5 is used as a male member. In addition to this, for example, as shown in FIG. 6, an elbow female socket 14 having a receiving portion 10 is provided. The straight male socket 1 having the insertion-side distal end portion 5 can be used as the male member as in the case of the above embodiment. Further, as shown in FIG. 7, the resin short tube 15 having the insertion end portion 5 is used as a male member, while the straight female socket 16 having the receiving portion 10 is used as a female member. As shown in FIG. 10, the resin short tube 2 having the receiving portion 10 can be a female member, while the elbow male socket 20 having the insertion-side distal end portion 5 can be a male member.

  Further, the female member having the receiving portion 10 may be an elbow-shaped female socket 21 as shown in FIG. As the female member having the receiving portion 10 and the male member having the insertion-side distal end portion 5, a tee type including both the receiving portion 10 and the insertion-side distal end portion 5 as shown in FIGS. 12, 13, and 14. The female / male socket 22 can be also used.

  12, 13, and 14, each of the tee-type female / male sockets 22 has a receiving portion 10 at one end and an insertion-side distal end portion 5 at the other end, and an intermediate branch port as a receiving portion. It is set to 10. In FIG. 12, the insertion-side end portion 5 of the straight male socket 1 is inserted and connected to the receiving portion 10 which is a branch port of the female / male socket 22. In FIG. 13, the insertion-side distal end portion 5 of the straight male socket 1 is inserted and connected to the receiving portion 10 at one end of the female / male socket 22. In FIG. 14, when the female and male sockets 22, 22 are connected to each other, that is, the insertion-side tip 5 at the other end of the other female / male socket 22 is connected to the receiving portion 10 at one end of one female / male socket 22. Are inserted and connected.

  Further, as shown in FIG. 15, the pipe joint of the present invention includes a plurality of straight male sockets 1, an elbow female socket 21, and one or a plurality of tee female / male males. The present invention can also be applied to a header for a sprinkler facility combined with a mold socket 22.

  In each of the embodiments shown in FIGS. 6, 7, and 10 to 15, the stopper ring 3 and the seal ring 4 are used to connect the male and female members in a retaining shape and in a sealing shape, and the stopper ring. 3 is the same as in the case of the embodiment shown in FIGS. 1 to 5, and therefore, the same members and the same elements are denoted by the same reference numerals and the description thereof is omitted.

  In the above embodiment, the sealing ring 4 is used as a means for sealing the overlapping surface between the receiving portion 10 of the resin short tube 2 and the insertion side tip 5 of the male socket 1, and the insertion side tip 5 of the male socket 1 is used. However, the present invention is not limited to this. For example, as shown in FIG. 16, the seal ring 4 is provided on the inner periphery of the receiving portion 10 of the resin short tube 2. It can be accommodated in the accommodating groove 6. Further, as shown in FIG. 7, an annular seal ring receiving groove 18 is provided in an annular receiving inner wall 17 provided in the inner part of the receiving portion 10 of the male socket 16, and this seal ring receiving groove 18. It is also possible to accommodate the seal ring 4 in close contact with the end surface of the insertion-side end portion 5 of the resin short tube 2.

After the male socket 1 which is a male member and the resin short tube 2 which is a female member are connected to each other in a sealing manner using the stopper ring 3 as described above, FIG. As shown in FIG. 18, a socket cover 23 formed in a cylindrical shape with a resin material such as polypropylene or polyethylene is covered and fitted around the outer periphery of the ring body 3 a of the stopper ring 3 on the outer periphery of the resin short tube 2 that is a female member. Match.
If the socket cover 23 is covered and fitted to the outer periphery of the resin short tube 2 in this way, the stopper ring 3 may be accidentally detached from the stopper ring housing groove 11 due to some external force or force due to internal pressure, or the resin short tube. 2 or the pulling force applied to the male socket 1 can prevent the stopper ring 3 from being twisted and deformed in the stopper ring receiving groove 11. The socket cover 23 can be fitted into the resin short tube 2 only when the stopper ring 3 is fitted into the stopper ring receiving groove 11 as specified. If a fitting failure that protrudes from the housing concave groove 11 occurs, the socket cover 23 cannot be fitted to the resin short tube 2, and the stopper is provided by an operation of fitting the socket cover 23 to the resin short tube 2. It can be easily confirmed whether or not the ring 3 is fitted into the stopper ring receiving groove 11 as specified.

  As shown in FIG. 17, the socket cover 23 is provided with an inward flange 23 a at the opening end at one end in the axial direction, and the inward flange when the outer cover of the resin short tube 2 that is a female member is covered and fitted. If 23a is brought into contact with and engaged with one end surface 2a of the resin short tube 2, the socket cover 23 can be easily and reliably attached to the resin short tube 2 by the positioning function of the inward flange 23a. .

  As shown in FIG. 19, an inward flange 23 a is provided at the opening end of one end in the axial direction of the socket cover 23, while a small-diameter pipe portion 2 b having an outer diameter smaller than the outer diameter of the receiving portion 10 is provided in the receiving portion 10. An annular rib 24 is provided on the outer periphery of the small-diameter tube portion 2b of the resin short tube 2 which is a female member provided continuously through the portion 2c. Thus, when the socket cover 23 is fitted from the small-diameter tube portion 2b of the resin short tube 2 to the outer periphery of the receiving portion 10, the inner peripheral edge of the inward flange 23a gets over the annular rib 24 and the annular rib 24 and the step portion 2c. , The socket cover 23 can be attached to the resin short tube 2 in a non-removable state. As shown in FIG. 20, when the inward flange 23a gets over the annular rib 24, a notch 25 is provided on the inner peripheral edge of the inward flange 23a in order to expand and deform by elasticity and make it easier to get over the annular rib 24. It is preferable.

  Even after the socket cover 23 is fitted, the socket cover 23 is transparent so that it can be easily confirmed from the outside of the socket cover 23 whether or not the stopper ring 3 is mounted in the stopper ring receiving groove 11. Or it is preferable to form semi-transparent. In this case, it is preferable that the socket cover 23 is formed in a different colored transparent or translucent color that is easily distinguishable from the colored coloring of the stopper ring 3 in terms of easy confirmation.

  In the header for the sprinkler equipment shown in FIG. 15, as shown in FIG. 21, the socket cover 23 can be covered and fitted from the male socket 1 to the outer periphery of the receiving portion 10 so as to cover the outer periphery of the stopper ring 3. it can. At this time, as in the case of the embodiment shown in FIG. 19, an inward flange 23 a is provided at the opening end of one end in the axial direction of the socket cover 23, while the annular rib 24 is arranged on the outer flange 1 a on the outer periphery of the male socket 1. When the socket cover 23 is fitted from the male socket 1 to the outer periphery of the receiving portion 10, the inner peripheral edge of the inward flange 23a gets over the annular rib 24 and the annular rib 24 and the outward flange 1a. Thus, the socket cover 23 can be attached to the outer periphery of the receiving portion 10 in a secured state.

  The pipe joint of the present invention can be similarly applied to the header for sprinkler equipment shown in FIG. The header branches off a male socket (branch port) 27, which is a male member, from a cylindrical body portion 26. The male socket 27 is thermally fused or electrically fused to one end of the resin pipe P. The female socket 28, which is a female member joined at, can be connected with one touch.

That is, the male socket 27 of the header has an insertion-side distal end portion 27a at one end, similar to the structure of the one-end side portion of the male socket 1 shown in FIG. 1, and a seal is provided on the outer periphery of the insertion-side distal end portion 27a. An annular seal ring housing groove 29 in which the ring 4 is housed, and an annular retaining groove 40 arranged side by side from the seal ring housing groove 29 toward the body portion 26 are provided. On the other hand, the female socket 28 has a receiving portion 41 as in the case of the resin short tube 2 shown in FIGS. 1 and 2, and a retaining claw 9 (see FIGS. A stopper ring receiving groove 42 into which the stopper ring 3 having a detachable fit is provided, and the groove bottom of the stopper ring receiving groove 42 is similar to the groove bottom of the stopper ring receiving groove 11 shown in FIG. A claw insertion hole 12 (see FIG. 2) corresponding to the retaining claw 9 of the stopper ring 3 is provided. Although not shown, a slide slope 13 (see FIG. 4) similar to the case shown in FIG. 4 is formed on one side surface of the tip of the retaining claw 9 of the stopper ring 3.
When appropriate, the stopper ring 3 having the slide slope 13 is previously fitted in the stopper ring-receiving recess groove 42 of the female socket 28, and then the female socket 28 is inserted into the insertion side distal end portion 27a of the male socket 27. By inserting the receiving portion 41, the female socket 28 can be connected to the male socket 27 in a retaining manner and in a sealing manner with a single touch.

After the female socket 28 is connected to the male socket 27 in this manner, the socket cover 23 covers the outer periphery of the ring body 3a of the stopper ring 3 on the outer periphery of the female socket 28, as in the case of the above embodiment. The cover is fitted. At that time, an inward flange 23a is provided at the opening end of one end of the socket cover 23 in the axial direction, and a small diameter pipe portion 28a having an outer diameter smaller than the outer diameter of the receiving portion 41 is provided in the receiving portion 41 via the step portion 28b. An annular rib 43 is provided on the outer periphery of the small-diameter pipe portion 28a of the female socket 28 continuously provided. Then, when the socket cover 23 is fitted from the small diameter tube portion 28a of the female socket 28 to the outer periphery of the receiving portion 41, the inner peripheral edge of the inward flange 23a gets over the annular rib 43 and the annular rib 43 and the step portion 28b. , The socket cover 23 can be attached to the female socket 28 in a non-removable state.

When a pulling force is applied to the female socket 2 that is a female member or the male socket 1 that is a male member by a force due to some external force or internal pressure, the stopper ring 3 expands and deforms in the diameter increasing direction, and the stopper ring receiving recess As a preventive measure for disengaging from the groove 11, besides the socket cover 23, or the socket cover 23 is adopted, the following measures can be taken.
As shown in FIGS. 23 and 24, one side surface 7a in the retaining groove 7 of the male socket 1, which is a male member, is formed in a groove shape that gradually widens inward, while FIGS. As shown in FIG. 4, the tip of the retaining claw 9 of the stopper ring 3 is engaged with the other side opposite to the slide slope 13 shown in FIG. Forming prevention slope 44 is formed. In this way, when the expansion prevention slope 44 of the retaining claw 9 of the stopper ring 3 is engaged with the groove-shaped one side surface 7a in the retaining groove 7, the female socket 2 or the male mold is caused by some external force or force due to internal pressure. Even when a pulling force is applied to the socket 1, the stopper ring 3 can be prevented from expanding and deforming in the diameter increasing direction, so that the stopper ring 3 can be reliably prevented from coming off from the stopper ring receiving groove 11.

1 is a half-broken cross-sectional view of a pipe joint showing an embodiment of the present invention. It is the sectional view on the AA line in FIG. It is a front view of the stopper ring of the pipe joint of FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is sectional drawing which shows the assembly process of the pipe joint of FIG. It is a half notched cross-sectional view of a pipe joint showing another embodiment. FIG. 6 is a half cutaway cross-sectional view of a pipe joint showing still another embodiment. Furthermore, it is sectional drawing which shows the pipe joint of another Example corresponding to FIG. 2, (a) is a mounting state figure of a stopper ring, (b) is a state figure in the middle of removal of a stopper ring. Furthermore, it is sectional drawing which shows the pipe joint of another Example corresponding to FIG. 2, (a) is a mounting state figure of a stopper ring, (b) is a state figure in the middle of removal of a stopper ring. Furthermore, it is a half notched cross-sectional view of a pipe joint showing another embodiment. Furthermore, it is a half notched cross-sectional view shown in a state before the pipe joint showing another embodiment is inserted and connected. Furthermore, it is a half notched cross-sectional view shown in a state before the pipe joint showing another embodiment is inserted and connected. Furthermore, it is a half notched cross-sectional view shown in a state before the pipe joint showing another embodiment is inserted and connected. Furthermore, it is a half notched cross-sectional view shown in a state before the pipe joint showing another embodiment is inserted and connected. Furthermore, it is sectional drawing at the time of applying the pipe joint of another Example to a header. Furthermore, it is a half notched cross-sectional view of a pipe joint showing another embodiment. Furthermore, it is a half notched cross-sectional view showing a pipe joint of another embodiment corresponding to FIG. It is CC sectional view taken on the line in FIG. Furthermore, it is a half notched cross-sectional view showing a pipe joint of another embodiment corresponding to FIG. It is a perspective view of the socket cover used for the pipe joint shown in FIG. Furthermore, it is sectional drawing at the time of applying the pipe joint of another Example to a header. Furthermore, it is a perspective view at the time of applying the pipe joint of another Example to a header. Furthermore, it is a half-broken cross-sectional view of a pipe joint of another embodiment. FIG. 24 is a half-broken cross-sectional view showing a state before connection of the pipe joint of FIG. 23. It is a front view of the stopper ring of the pipe joint of FIG. It is the DD sectional view taken on the line in FIG. It is the EE sectional view taken on the line in FIG. It is a half notched cross-sectional view of a conventional pipe joint.

Explanation of symbols

1 Straight male socket (male member)
2 Resin short pipe (female member)
DESCRIPTION OF SYMBOLS 3 Stopper ring 3a Ring main body 3b, 3b Opening both ends 4 Seal ring 5 Insertion side front end 7 Retaining groove 7a One side surface of groove 9 Retaining claw 9a Retaining claw tip 10 Receiving part 11, 42 Stopper ring receiving groove 11a Groove end wall 12 Claw insertion hole 13 Sliding slope 14, 21 Elbow type female socket (female member)
15 Resin short pipe (male type member)
16 Straight female socket (female member)
19 Finger-hanging projections 20 Elbow-shaped male socket (male member)
22 Tee type female / male socket (female / male member)
23 socket cover 23a inward flange 24 annular rib 25 notch 27 male socket (male member)
28 Female socket (female member)
44 Slope prevention

Claims (17)

A female member having a receiving part at least at one end, a male member having an insertion-side tip inserted into the receiving part of the female member, and a superposition surface of the receiving part and the insertion-side tip A pipe joint including a seal ring interposed therebetween and a stopper ring mounted on the outer periphery of the receiving portion,
The male member is provided with a retaining groove in the circumferential direction on the outer periphery of the insertion-side distal end,
The stopper ring has a ring body which is formed in a C shape having both open ends and is elastically expandable and contractible, and a plurality of retaining claws integrally projecting inwardly on the inner periphery of the ring body. Formed into a shape,
The female member is provided with a stopper ring receiving groove into which the stopper ring is fitted on the outer periphery of the receiving portion so as to correspond to the outer periphery of the retaining groove, and at the groove bottom of the stopper ring receiving groove, A claw insertion hole is provided for allowing the stopper claw of the stopper ring to pass therethrough and the tip of the stopper claw protrudes inward of the receiving portion, and the tip of the locking claw protruding from the claw insertion hole The portion is engaged with the retaining groove, a pipe joint.   The pipe joint according to claim 1, wherein an insertion-side distal end portion of the male member is inserted into a receiving portion of the female member so as to be relatively rotatable.   The pipe joint according to claim 1 or 2, wherein the stopper ring is detachably fitted into the stopper ring receiving concave groove.   The slide inclined surface is formed on one side surface of the tip end portion of the stopper claw of the stopper ring to allow the insertion side tip portion of the male member to be inserted into the receiving portion when the stopper ring is mounted. The pipe joint according to any one of 1 to 3.   The female member is a resin short tube having a receiving portion, and the male member is a male socket such as a straight type, an elbow type, or a tee type having an insertion side tip. The pipe joint according to any one of claims.   The female type member is a female type socket such as a straight type, an elbow type, or a tee type having a receiving portion, and the male type member is a resin short pipe having an insertion side distal end portion. The pipe joint according to any one of claims.   The female member is a female socket such as a straight type, elbow type, or tee type having a receiving portion, and the male type member is a male type socket such as a straight type, elbow type, or tee type having a distal end portion on the insertion side. The pipe joint according to any one of claims 1 to 4, wherein   The pipe joint according to claim 5 or 6, wherein one end of a resin pipe is joined to the resin short pipe.   The pipe joint according to claim 3, wherein both open end portions of the stopper ring protrude from the outer peripheral surface of the receiving portion.   The pipe joint according to claim 3, wherein a finger hooking protrusion is provided on a part of the outer periphery of the ring body of the stopper ring.   The stopper ring receiving groove is formed on the outer periphery of the receiving portion to have a length corresponding to the circumferential length of the stopper ring, and groove end walls are provided at both ends of the stopper ring receiving groove, and the groove end wall is provided with the groove end wall. The pipe joint according to claim 10, wherein both open ends of the stopper ring are brought close to or in contact with each other.   The pipe joint according to any one of claims 1 to 9, wherein a cylindrical socket cover is covered and fitted to an outer periphery of the female member so as to cover an outer periphery of the ring body. .   The pipe joint according to claim 12, wherein an inward flange that comes into contact with and engages with one end surface of the female mold member is provided at an opening end of one end in the axial direction of the socket cover.   The pipe joint according to claim 13, wherein an annular rib is provided on an outer periphery of the female member or the male member so that the inward flange is engaged in a retaining shape.   The pipe joint according to any one of claims 12 to 14, wherein the socket cover is formed to be transparent or translucent.   The pipe joint according to claim 14, wherein a notch is formed in an inner peripheral edge of the inward flange.   One side in the retaining groove of the male member is formed into a dovetail shape that gradually widens inward, and engages with the other side of the tip of the retaining claw of the stopper ring to one side of the dovetail shape The pipe joint according to any one of claims 1 to 16, wherein the pipe-shaped slope is formed so as to have a curved shape.

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