JP4989408B2 - Reuse identification method for plug-in fittings - Google Patents

Description

  The present invention relates to a reuse identification method for a plug-in type pipe joint used for connecting a pipe such as a stainless steel pipe for water supply or hot water supply with a single touch, and more specifically, an O-ring accommodated in a joint body, etc. The present invention relates to a reuse identification method for plug-in fittings that enables identification of unauthorized reuse of seal rings.

As this type of one-touch plug-in pipe joint, for example, as shown in FIG. 19, an O-ring 31 is fitted into two circumferential grooves provided on the inner surface of the large-diameter portion of the base body (joint body) 30, A coil spring 32 at the edge of the large-diameter portion and an inner collar 34 made of a synthetic resin that holds a pressing member 33 having a right-angled edge 33a on the inner surface are arranged and covered with a tapered outer collar (press wheel) 35. (See Patent Document 1). According to this plug-in type pipe joint, when the connecting pipe 36 is inserted from the front end of the inner collar 34, the pressing member 33 is pressed toward the front end side of the inner collar 34, but the outer surface of the pressing member 33 is the outer collar 35. By being pressed by the tapered surface 35a and the right-angled edge 33a on the inner surface biting into the connecting pipe 36, the connection between the plug-in type pipe joint and the connecting pipe 36 is maintained. When a pulling force acts on the connection pipe 36 in this coupled state, the pressing member 33 is pressed against the tapered surface 35a side of the outer collar 35 by the elastic force of the coil spring 32, and the right-angled edge 33a of the pressing member 33 is formed by the tapered surface 35a. When the connection pipe 36 is pressed, the connection pipe 36 is prevented from being pulled out.
On the other hand, in order to pull out (detach) the connection pipe 36 once connected, the pressing member 33 is moved inward by pushing the tip 34a of the inner collar 34 inward of the base body 30 with a driver or the like against the elastic force of the coil spring 32. It moves inward together with the collar 34, and the tightening force on the connecting pipe 36 due to contact with the tapered surface 35a is released, whereby the connecting pipe 36 can be pulled out.

JP-A-10-122460 (FIGS. 1 to 7, FIG. 16, [0031], [0032])

However, in the above-described conventional plug-in type pipe joint, the O-ring 31 continues to be deformed over time under a constant compressive load between the inner surface of the joint body 30 and the outer surface of the connection pipe 36 and is once connected. When the connecting pipe 36 is pulled out and connected again, the original sealing performance may not be secured.
If an outer edge is generated at the end of the connecting pipe 36 when the connecting pipe 36 is inserted, the O-ring 31 is damaged at the end, and the connecting pipe 36 is inserted into the joint body 30 at an angle. In some cases, the O-ring 31 was easily damaged at the end of the connecting pipe 36 at this time.
Nevertheless, when the connecting pipe 36 once connected is pulled out and connected again, it is difficult or impossible to replace the O-ring 31 with a new O-ring because the O-ring 31 is incorporated inside the joint body 30. Therefore, the O-ring 31 is used again as it is, and there is a problem that the sealing performance cannot be secured.

  The present invention has been made to solve such problems, and the object of the present invention is to provide a plug-in pipe joint that enables the connection pipe to be pulled out as described above. By attaching a trace of the use of the tube extraction jig used when pulling out to the collar that holds the retaining member, it is easy to identify the reuse of seal rings such as O-rings, and therefore, the seal rings can be reused illegally. It is an object of the present invention to provide a method for identifying reuse of a plug-in type pipe joint that contributes to prevention of occurrence and can ensure sealing performance.

  The reusable identification method of the plug-in type pipe joint according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 to 9 in order to facilitate understanding of the contents of the invention as described in claim 1. And having a receiving part (12) for receiving the end of the connecting pipe (11) at least at one end, and tapering in the inner periphery of the receiving part (12) toward the outside of the receiving part. Inside the joint body (2) forming the surface (13), the outer diameter part is inscribed in the tapered surface (13) and the inner diameter part is connected in order from the receiving part (12) to the inner part of the joint body. A retaining member (3) engaged with the outer peripheral surface of the tube (11), a collar (15) holding the retaining member (3), and the retaining member (3) together with the collar (15) and a tapered surface (13) An elastic member (4) that presses and urges toward the outer surface and a seal ring (5) that is in close contact with the outer peripheral surface of the connection pipe (11). Then, the rear end side of the collar (15) facing the outside of the receiving part (12) is pressed with the pipe pulling jig (22), and the retaining member (3) is moved inwardly of the joint body (2). The difference in which the engagement with the outer peripheral surface of the connection pipe (11) of the retaining member (3) is released by pushing against the elastic force of the elastic member (4) to allow the connection pipe (11) to be pulled out. In the reusable identification method of a built-in pipe joint, the rear end side of the collar (15) is pressed with the pipe-drawing jig (25) and the inner surface or rear end surface of the rear end side of the collar (15) is identified. It is characterized by attaching a mark (27).

According to such a structure, since the retaining member (3) engaged with the outer peripheral surface of the connection pipe (11) is accommodated in the joint body (2), the connection pipe (11) is connected to the receiving portion ( 12) It can be connected in a retaining shape with a one-touch operation by simply inserting it.
In addition, an elastic member that presses and urges the retaining member (3) toward the inner periphery of the receiving portion (12) between the seal ring (5) in the joint body (2) and the retaining member (3). 4) is accommodated, and the tapered surface (13) in which the outer diameter portion of the retaining member (3) is inscribed in the inner periphery of the receiving portion (12) is constricted toward the outside of the receiving portion (12). When the connecting pipe (11) is completely inserted, the retaining member (3) is pressed against the tapered surface (13) of the receiving port (12) by the elastic member (4), and the taper The retaining member (3) is reduced in diameter by the surface (13) and engaged with the outer peripheral surface of the connecting pipe (11), whereby a reliable retaining state of the connecting pipe (11) is obtained.
Further, when a pulling force is applied to the connecting pipe (11) after the connecting pipe (11) is inserted, the outer diameter portion of the retaining member (3) that accompanies the connecting pipe (11) is the taper of the receiving part (12). By coming into contact with the surface (13), the retaining member (3) moves radially inward, and the engagement force with the outer peripheral surface of the connecting pipe (11) increases. This reliably prevents the connecting pipe (11) from coming out.

The rear end side of the collar (15) is pressed with the tube extraction jig (25), and the resilient member (4) is resisted against the elastic force of the elastic member (4) in the inner part of the joint body (2) together with the retaining member (3). By pushing in, the engagement of the retaining member (3) with the outer peripheral surface of the connection pipe (11) can be released, and the connection pipe (11) can be extracted.
Since the rear end side of the collar (15) is pressed by the tube drawing jig (25), the identification mark (27) is attached to the inner surface or rear end surface of the rear end side of the collar (15). By checking the presence or absence of the identification mark (27), it is easily determined whether or not the tube extraction jig (25) is used and the connection tube (11) is once pulled out and reconnected. In the case of reconnection, the seal ring (5) is incorporated in the inner part of the joint body (2) and is difficult or impossible to take out. it can. This provides a constant deterrent against unauthorized reuse of the seal ring (5).

  In the method for identifying reuse of a plug-in type pipe joint according to claim 1, the identification mark (27) is a jig for pipe removal (25) and the rear end side of the collar (15) as described in claim 2. The structure which consists of a damage | wound or coloring given to the inner surface or rear-end surface of can be employ | adopted. According to such a configuration, it is easy to visually identify the trace of use of the tube extraction jig (25) by confirming scratches or coloring.

The reuse identification method of the plug-in type pipe joint according to claim 1 or 2 is arranged at the inner diameter part of the seal ring (5) in the joint main body (2) and connected to the connecting pipe ( 11) an anti-scratching sleeve (7) that can be fitted to the end of the connecting tube (11). The anti-scratching sleeve (7) is connected to the connecting tube (11) as the connecting tube (11) is inserted to a predetermined length. 11) It is possible to adopt a configuration in which it is pushed toward the inside of the joint body at the end of 11) so as to come out of the seal ring (5). According to such a structure, since the damage prevention sleeve (7) that can be fitted to the end of the connection pipe (11) is provided, when the connection pipe (11) is cut, some outer edges are formed on the cut end face. Even if the processing for generating and removing it is neglected and the connecting pipe (11) is inserted obliquely, the seal ring (5) is not damaged by the outer edge of the end of the connecting pipe (11). Can be constructed.
When the damage prevention sleeve (7) is provided in this way, when the connection pipe (11) is pulled out and reconnected by using the pipe removal jig (25), the damage prevention sleeve (7 ) Is also embedded in the inner part of the joint body (2), and it is difficult or impossible to take out, so is the identification mark (27) attached to the inner surface or rear end surface of the collar (15) on the rear end side? By confirming whether or not the damage prevention sleeve (7) is reused as it is, it is possible to identify whether or not the damage prevention sleeve (7) is reused as it is, and it becomes a certain deterrent against unauthorized reuse of the damage prevention sleeve (7).

  According to the present invention, it is possible to identify whether or not the seal ring has been illegally reused by checking whether or not an identification mark is attached to the inner surface or rear end surface of the collar that holds the retaining member. As a result, it is possible to prevent unauthorized reuse of the seal ring, and to secure the sealing performance.

  FIG. 1 is a perspective view showing an embodiment of a plug-in pipe joint that is an object of the present invention, and FIG. 2 is a half-cut cross-sectional view of the plug-in pipe joint showing a state after the connection pipe is completely inserted. 3 is a half cutaway cross-sectional view of the same plug-in type pipe joint showing a state before the connection pipe is inserted, FIG. 4 is a cutout cross-sectional view of the same plug-in type pipe joint showing a state during insertion of the connection pipe, FIG. FIG. 6 is a perspective view of a damage prevention sleeve of the plug-in fitting, and FIG. 7 is a plug-in plug-in fitting. FIG. 8 is a front view of the collar, FIG. 9 is a cross-sectional view of the collar, and FIG. 10 is a perspective view showing an embodiment of a pipe extracting jig of the plug-in joint. 11 is a perspective view of the tube extraction jig as viewed from the bottom, FIG. 12 is a plan view of the tube extraction jig, FIG. 13 is a side view of the tube extraction jig, and FIG. Rear view of jig for 15 is a bottom view of the jig for the tube vent, 16 is a semi missing transverse section view showing a state in which the set in the insertion type pipe joint after connecting pipe insertion completed 2 to jig the tube vent.

  As shown in FIG. 1 to FIG. 3, a plug-in pipe joint 1 as an object of the present invention includes a joint body 2 having a cylindrical shape with both ends opened, and a retaining member housed in the joint body 2. A member 3, an elastic member 4, a seal ring 5, a scratch preventing sleeve 7, and the like are provided.

  Since the joint body 2 requires corrosion resistance and rigidity, it is manufactured by, for example, a precision casting method using an SCS material or a bronze material. As shown in FIG. 3, the joint body 2 is provided with a first step portion 8 near the center in the axial direction, a large diameter portion 9 on one side and a small diameter portion on the other side across the first step portion 8. A flow path 10 is formed, and an opening end portion of the large diameter portion 9, that is, a receiving end portion 12 into which an end portion of the connection pipe 11 is inserted at one end portion in the axial direction of the joint body 2 is formed, and connected to the outer periphery of the other end portion A male screw 6 is formed. A tapered surface 13 that is narrowed toward the outside of the receiving portion on the inner periphery of the opening end side of the receiving portion 12, and a circumferential groove 14 is formed on the outer end of the receiving portion of the tapered surface 13. Yes. A second step portion 19 having a diameter larger than that of the first step portion 8 is provided on the inner periphery of the intermediate portion between the first step portion 8 and the tapered surface 13 in the receiving portion 12.

  As shown in FIG. 3, inside the receiving portion 12, the retaining member 3 that is inscribed in the tapered surface 13, the collar 15 that holds the retaining member 3, and the retaining member 3 together with the collar 15 toward the tapered surface 13. The elastic member 4 that presses and urges is accommodated. The retaining member 3 may be formed of a material harder than the connecting pipe 11, for example, martensitic stainless steel (SUS420) when the connecting pipe 11 is austenitic stainless steel (SUS304). A stopper ring 16 is fitted in the circumferential groove 14 of the joint body 2 to prevent the collar 15 from coming out of the receiving portion at the inner diameter portion thereof. The stopper ring 16 can be formed of austenitic stainless steel (SUS304) or the like.

  The elastic member 4 is formed of a compression coil spring or the like, and the rear end portion of the elastic member 4 engages with a step portion 15 a at the front end of the collar 15, and the front end portion of the elastic member 4 is disposed adjacent to the seal ring 5. It is engaged with an annular spacer 17 having a shape. When a compression coil spring is used as the elastic member 4, this member can be formed of austenitic stainless steel (SUS304) or the like.

  The seal ring 5 is formed of an olefin rubber packing or the like so as to be elastically deformable. In particular, the seal ring 5 is formed of EPDM, which is a terpolymer of ethylene, propylene, and a crosslinking diene monomer excellent in chlorine resistance and heat resistance. Further, it can be formed of FKM (fluoro rubber) having excellent heat resistance and chemical resistance. As shown in FIG. 3, the sealing 5 is formed to have a ring body 5a and an elastically deformable annular seal protrusion 5b projecting radially inward of the ring body 5a. The inner diameter of the projecting piece 5 b is smaller than the outer diameter of the connecting pipe 11. In addition to forming the seal ring 5 in a V-shaped or U-shaped cross section as shown in FIG. 3, it can also be formed in a L-shaped cross section as shown in FIG. The seal ring 5 is accommodated in the second step portion 19 in the receiving port 12.

  The damage prevention sleeve 7 is made of plastic, such as PP or PE, or metal. As shown in FIGS. 2 and 6, the inner diameter is substantially the same as or smaller than the inner diameter of the connecting pipe 11, and the outer diameter is a joint. The seal ring holding cylinder part 7a formed smaller than the inner diameter of the inner peripheral surface 20 between the first step part 8 and the second step part 19 in the main body 2, and the rear end side of the seal ring holding cylinder part 7a Are formed in a shape having a thin connecting pipe end receiving tube portion 7 b that is formed to have an inner diameter larger than the outer diameter of the connecting pipe 11 and can be fitted to the end of the connecting pipe 11. . Between the inner peripheral surface of the seal ring holding cylinder part 7a and the inner peripheral surface of the connection pipe end receiving cylinder part 7b, a step part 23 with which the end of the connection pipe 11 abuts is formed. On the outer periphery of the seal ring holding cylinder portion 7a, there is a seal protrusion 5b of the seal ring 5 in a free state (a state in which the seal ring 5 is not deformed so as to expand its diameter and no compressive stress or tensile stress is applied). A recessed groove 24 having a substantially V-shaped cross section is formed. The rear end portion 7c of the connecting tube end receiving tube portion 7b is formed in a trumpet shape that gradually increases in diameter rearward, so that the end of the connecting tube 11 is inserted into the connecting tube end receiving tube portion 7b when the connecting tube 11 is inserted. The rear end 7c is smoothly inserted without being caught. Slits S are provided at predetermined intervals in the circumferential direction in the connecting tube end receiving cylinder portion 7b. The outer periphery of the front end of the seal ring holding cylinder 7a is rounded or tapered, and is easily inserted into the inner peripheral surface 20 in the joint body 2.

  The collar 15 is formed of general-purpose engineering plastics such as cross-linked polyethylene or special engineering plastics such as PPS (polyphenylene sulfide) having excellent heat resistance, and has a plurality of holding holes as shown in FIGS. 15b is provided at predetermined intervals in the circumferential direction, and the retaining member 3 is fitted in each holding hole 15b. A plurality (two in the illustrated example) of engaging teeth 3 a are formed on the inner diameter side of each retaining member 3.

  10 to 15 show a tube extraction jig 25 that is used when the connection tube 11 is artificially detached from the insertion-type pipe joint 1 after the connection tube 11 is connected. This tube extraction jig 25 has a jig body 25a formed in a circular arc shape so that it can be fitted to the outer periphery of the connecting pipe 11 from one side thereof, and the jig body 25a. A collar pressing portion 25b provided at the tip and a grip portion 25c provided at the rear end of the jig body 25a are formed. The collar pressing portion 25 b is formed to have a diameter substantially the same as the diameter of the rear end portion 15 c of the collar 15. Then, an identification mark 27 (refer to a virtual line in FIG. 9) is provided on the inner surface or the rear end surface of the rear end portion of the tube punching jig 25 when the rear end portion of the collar 15 is pressed by the collar pressing portion 25b. A mark providing unit 28 is provided.

  A more specific configuration of the mark imparting portion 28 will be described. A protruding piece 26 made of a metal material harder than the material of the collar 15 is fixed to protrude from the collar pressing portion 25b. The protruding piece 26 is formed in a circular arc shape along the jig main body 25 a having a circular arc cross section, and the protruding tip portion of the connecting tube 11 inserted through the collar 15 and the inner periphery of the rear end portion 15 c of the collar 15. It is formed in a shoehorn shape that can be inserted into the gap between the outer periphery. On the outer surface of the protruding piece 26 on the protruding front end side, as shown in FIGS. 11 and 15, a pointed protrusion 26 a constituting the mark applying portion 28 is provided on the inner periphery of the rear end portion 15 c of the collar 15 and the outer periphery of the connecting tube 11. The front end side of the projecting piece 26 is inserted into a gap between the inner periphery of the rear end portion 15 c of the collar 15 and the outer periphery of the connecting pipe 11. Accordingly, an identification mark 27 made of an abrasion is attached to the inner surface or the rear end surface 15d of the rear end portion 15c of the collar 15. One protrusion 26a may be provided, but a plurality of protrusions 26a are preferably arranged at predetermined intervals in the circumferential direction. If a plurality of protrusions 26a are provided at predetermined intervals in the circumferential direction, the same number of scratches 27 as the protrusions 26a can be provided at predetermined intervals, so that the rear end portion 5c of the collar 15 at the end of the connecting tube 11 is provided. It becomes easy to distinguish from other scratches scratched on the inner peripheral surface.

  Next, construction procedures for connecting and disconnecting the connecting pipe 11 by the plug-in pipe joint 1 will be described with reference to FIGS.

First, when connecting the connecting pipe 11, as shown in FIG. 4, the connecting pipe 11 is inserted into the receiving portion 12 of the joint body 2, and the end of the connecting pipe 11 is received at the connecting pipe end portion of the scratch preventing sleeve 7. It is inserted into the cylindrical portion 7b and brought into contact with the step portion 23 in the scratch preventing sleeve 7. With the insertion of the connecting pipe 11, the retaining member 3 moves along the tapered surface 13 of the receiving portion 12 in the inner and inner directions of the joint body 2, and the engaging teeth 3 a engage with the outer peripheral surface of the connecting pipe 11. . Even if an external force is applied in the direction in which the connecting pipe 11 is pulled out in this state, the engaging teeth 3a of the retaining member 3 that contacts the tapered surface 13 of the receiving portion 12 are engaged with the outer peripheral surface of the connecting pipe 11. The connecting pipe 11 will not come out.
Further, when the connecting pipe 11 is inserted, the damage prevention sleeve 7 is interposed between the seal ring 5 and the end of the connecting pipe 11, and in this state, the end face of the end of the connecting pipe 11 is not in contact with the seal ring 5. Since the joint body 2 is inserted in the contact state, even if an outer edge is formed on the end face of the connection pipe 11, the seal ring 5 is not damaged by the outer edge. Even if it is inserted obliquely, the seal ring 5 is not damaged at the end, and water leakage due to damage of the seal ring 5 does not occur.

When the connection pipe 11 is inserted further deeply, a seal connection state between the joint body 2 and the connection pipe 11 is obtained as shown in FIG. That is, when the connecting pipe 11 is inserted partway into the joint body 2 in the state shown in FIG. 5, the connecting pipe 11 pushes the scratch-preventing sleeve 7 inward in the joint body, and the seal ring holding cylinder portion 7a is the seal ring. Come to the same position as 5.
Further, when the connecting pipe 11 is inserted, the connecting pipe 11 is connected to the damage prevention sleeve 7 with the seal ring holding cylinder portion 7a contacting the first step portion 8 in the joint body 2 as shown in FIG. The tube end receiving tube portion 7b is pushed inward from the seal ring 5 in the joint body. In this process, the scratch-preventing sleeve 7 moves while turning the seal protrusion 5b of the seal ring 5 in the inner direction of the joint body and is detached from the seal ring 5, and the insertion of the connecting pipe 11 is completed as shown in FIG. Then, the seal projecting piece 5b of the seal ring 5 is in close contact with the outer peripheral surface of the connection pipe 11 in a compressed state, and a state of hermetically sealing between the outer peripheral surface of the connection pipe 11 and the inner peripheral surface of the joint body 2 is obtained. A retaining state in which the engaging teeth 3a of the retaining member 3 are engaged with the outer peripheral surface of the connecting tube 11 is obtained.

When the seal protrusion 5b of the seal ring 5 is in a compressed state in close contact with the outer peripheral surface of the connection pipe 11 with the seal protrusion 5b facing inward in the joint body 2, water flowing in the joint body 2 Even if it flows into the seal ring 5 from between the circumference and the damage prevention sleeve 7 or between the end of the connection pipe 11 and the damage prevention sleeve 7, the seal protrusion 5 b is applied to the outer peripheral surface of the connection pipe 11 by the water pressure. A sealing pressure of pressing is generated, so that the sealing function is effectively exhibited by the single seal ring 5.
Further, the seal protrusion 5b of the seal ring 5 is easily slid by the sliding action of the inner surface of the concave groove 24 of the damage prevention sleeve 7 and the outer peripheral surface of the connection tube end receiving tube portion 7b with a small insertion load of the connection tube 11. Therefore, the connecting pipe 11 can be easily inserted and operated.

  After the connection pipe 11 is completely inserted, when the connection pipe 11 is pulled in the pulling direction, the outer diameter portion of the retaining member 3 that accompanies the connecting pipe 11 comes into contact with the constricted side of the tapered surface 13, so that the retaining member 3 is The engagement teeth 3a bite into the outer peripheral surface of the connecting pipe 11 and increase the engagement force by moving radially inward. This reliably prevents the connection pipe 11 from coming out.

  Next, a procedure for artificially removing the connection pipe 11 from the plug-in pipe joint 1 after the connection pipe 11 is connected will be described.

  First, as shown in FIG. 16, the pipe-drawing jig 25 is fitted into the outer periphery of the connection pipe 11 in the vicinity of the receiving port 12 of the plug-in pipe joint 1 from one side thereof, and accordingly, Holding the grip portion 25c in a state of sandwiching the connection tube 11, the protruding piece 26 is inserted into the gap between the inner periphery of the rear end portion 15c of the collar 15 and the outer periphery of the connection tube 11, and the color pressing portion 25b. Is brought into contact with the rear end portion 15c of the collar 15 and the collar 15 is pushed together with the retaining member 3 inward of the joint body 2 against the elastic force of the elastic member 4. By this pushing, the retaining member 3 is moved inwardly of the joint body 2 to release the engagement with the outer peripheral surface of the connecting pipe 11, and in this state, the connecting pipe 11 is pulled out to separate them. Can be done easily. Next, after the connection tube 11 is detached, the collar 15 is pushed back to the original position by the elastic member 4 again when the force pushing the collar 15 by the tube pulling jig 25 is released.

  As described above, when the collar 15 is pushed in with the tube extraction jig 25 when the connection tube 11 is extracted, the identification mark 27 made of an abrasion is attached to the inner surface of the collar 15 on the rear end portion 15c side by the projection 26a. . That is, the identification mark 27 is a trace of the use of the tube extraction jig 25. Therefore, by confirming the presence or absence of the identification mark 27, it is possible to easily determine whether or not the tube extracting jig 25 is used and the connecting tube 11 is once pulled out and reconnected. In the case of reconnection, since the seal ring 5 and the scratch-preventing sleeve 7 are incorporated in the inner part of the joint body 2 and are difficult or impossible to take out, it can be identified that they are reused as they are. This provides a deterrent against unauthorized reuse of the seal ring 5 and the scratch protection sleeve 7.

Instead of scratching the inner surface on the rear end portion 15c side of the collar 15 using a tube extraction jig 25 having a protruding piece 26 having a mark applying portion made of a protrusion 26a, as shown in FIG. A mark applying portion 28 made of a sharp uneven portion such as a saw tooth is provided at the tip of the color pressing portion 25b of the tube punching jig 25, and the rear end surface 15d of the collar 15 is pressed by the color pressing portion 25b at the same time. The end face 15d may have a trace of pressing by the uneven portion. In that case, only the rear end portion 15c including the rear end surface 15d of the collar 15 is formed of a soft resin material or the like in which the press trace is likely to remain in order to make it easy to apply a trace of pressing by the uneven portion to the rear end surface 15d of the collar 15. Also good.
Further, as shown in FIG. 18, a tube punching jig 25 provided with a mark applying portion 28 made of a colored ink impregnated mat or a porous printing body at the tip of the color pressing portion 25b is used, and the color pressing portion 25b is used. Then, the rear end face 15d of the collar 15 is pressed to push the collar 15 inward, and at the same time, the rear end face 15d can be colored by imprinting colored ink. Thus, the scratches and coloring on the rear end surface 15d of the collar 5 are easier to see from the outside than the scratches 27 on the inner surface on the rear end portion 15c side of the collar 15.

  In the above-described embodiment, the male thread adapter plug-in type pipe joint in which the male thread 6 for connection is formed on one side of the joint body 2 has been described. However, the present invention is not limited to this, and other structures such as left-right symmetry are provided. Of course, the present invention can also be applied to socket-type plug fittings, elbow-type plug fittings, and the like. Further, the connecting pipe 11 is not limited to a metal pipe such as a stainless steel pipe, and can be applied to a connecting pipe made of resin, for example, a connecting pipe made of vinyl chloride.

It is a perspective view which shows one Example of the insertion type pipe joint of the object of this invention. It is a half notched cross-sectional view of the plug-in type pipe joint showing a state after the connection pipe is completely inserted. It is a half notched cross-sectional view of the same plug-in type pipe joint showing a state before the connecting pipe is inserted. It is a half notched cross-sectional view of the same plug-in type pipe joint showing a state during the insertion of the connecting pipe. It is a half notched cross-sectional view of the plug-in type pipe joint showing a state in the middle of further insertion of the connecting pipe. It is a perspective view of the damage prevention sleeve of the plug-in type pipe joint. It is a top view of the color of the plug-in type pipe joint. It is a front view of the same color. It is sectional drawing of the same color. It is a perspective view which shows one Example of the jig for pipe | tube extraction of the same insertion type pipe joint. It is the perspective view which looked at the jig for tube extraction from the bottom side. It is a top view of the jig for tube extraction. It is a side view of the jig for tube extraction. It is a rear view of the jig for tube extraction. It is a bottom view of the same jig for tube extraction. FIG. 3 is a half cutaway cross-sectional view showing a state in which the pipe pulling jig is set in the plug-in type pipe joint after the connection pipe insertion is completed in FIG. 2. It is a top view of the jig for tube extraction which shows another Example. It is a perspective view of the jig for tube extraction which shows other examples. It is a half notched cross-sectional view of a conventional plug-in type pipe joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug-in type pipe joint 2 Joint main body 3 Pull-out member 4 Elastic member 5 Seal ring 7 Damage prevention sleeve 7a Seal ring holding | maintenance cylinder part 7b Connection pipe end part receiving cylinder part 11 Connection pipe 12 Receptacle part 13 Tapered surface 15 Collar 25 Tube extraction jig 27 Identification mark 28 Marking part

Claims (3)

  The interior of the joint main body having a receiving portion for receiving the end portion of the connecting pipe at least at one end portion, and forming a tapered surface constricted toward the outside of the receiving portion on the inner periphery of the receiving portion And a retaining member in which the outer diameter portion is inscribed in the taper surface and the inner diameter portion is engaged with the outer peripheral surface of the connecting pipe in order from the receiving portion toward the inner depth of the joint main body, and the retaining member is held. A collar, an elastic member that presses and urges the retaining member together with the collar toward the tapered surface, and a seal ring that is in close contact with the outer peripheral surface of the connection pipe are housed, and the receiving port is provided by a tube-drawing jig. The outer end surface of the connecting pipe of the retaining member by pressing the rear end side of the collar facing the outside of the portion and pushing the retaining member together with the retaining member against the elastic force of the elastic member in the inner and inner directions of the joint body. Reuse plug-in fittings that release the engagement and allow connection pipes to be removed. In the identification method, the pipe-type fitting is characterized in that the rear end portion side of the collar is pressed with the tube extracting jig and an identification mark is attached to the inner surface or rear end surface of the rear end portion side of the collar. Reuse identification method.   2. The plug-in pipe joint according to claim 1, wherein the identification mark is made of a scratch or a color attached to an inner surface or a rear end surface of the collar at the rear end portion side with the tube extraction jig. Usage identification method.   The joint body includes a damage prevention sleeve that is disposed on the inner diameter portion of the seal ring and can be fitted to the end of the connection pipe. The damage prevention sleeve includes a connection pipe having a predetermined length. The reuse of the plug-in type pipe joint according to claim 1 or 2, wherein the plug-in pipe joint is pushed out from the seal ring by being pushed toward the inside of the joint body at the end of the connecting pipe as it is inserted. Identification method.

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