JP4580840B2 - Mechanical type pipe joint and clamp tightening method in the pipe joint - Google Patents

Description

  The present invention is used in pipes for water supply / hot water supply, cold / hot water, cooling water, etc., and is a mechanical type pipe joint that can be easily and quickly inserted and connected in a seal-like and retaining form at one end of the pipes, and The present invention relates to a clamp tightening method in the pipe joint.

  As a pipe joint used for piping such as water supply and hot water supply, for example, plug-in type pipe joints as shown in FIGS. 11 and 12 have been proposed (for example, see Patent Document 1). In this plug-in type pipe joint, opening portions 32 into which one end portions of the pipes P are respectively inserted are opened at both end portions of the tubular joint body 31, and the inner peripheral surface of the receiving portion 32 is formed outward in the tube axis direction. A tapered taper surface 33 is formed, and a tube end stopper portion 34 is provided on the inner periphery of the receiving portion 32. A lock ring 35 that is freely expandable and contractible and a rubber packing 36 that is disposed on the inner back side of the lock ring 35 are incorporated in the receiving portion 32 of the joint body 31. On the other hand, a lock ring groove 37 for engaging with the lock ring 35 is previously provided in a circumferential direction at a predetermined position on the outer surface of one end of the pipe P such as a thin stainless steel pipe connected by the pipe joint. In addition, one or two or more viewing windows 38 for visually confirming whether the lock ring 35 is securely engaged with the lock ring groove 37 are provided on the outer peripheral wall of the receiving portion 32 of the joint body 31. ing.

  In this plug-in type pipe joint, as shown in FIG. 11, one end of the pipe P passes through the receiving port 32 and the lock ring groove 37 passes through the position of the lock ring 35, and the most distal end of the pipe P is the pipe end stopper 34. 12, the pipe P is slightly pulled back by hand as shown in FIG. 12, and the lock ring 35 is subjected to a diameter reducing action due to contact with the taper surface 33 in the course of the pull back, and thus enters the lock ring groove 37. By engaging, the retaining function of the pipe P is ensured.

  According to this plug-in type pipe joint, the pipe P is simply grooved in advance, and when the pipe P is connected, the pipe P is inserted until it hits the pipe end stopper portion 34 in the joint body 31 and then pulled back slightly. There is an advantage that it can be easily and quickly connected by one-touch operation.

JP 2002-340256 A

  However, in the above plug-in type pipe joint, the lock ring groove 37 needs to be processed into a sawtooth cross-sectional shape as shown in the enlarged view in FIG. Since a dedicated tool is required for grooving the shape, even if grooving can be done at the factory, it is difficult to manage the wear and sag of the tool at the construction site. It is difficult to perform regular grooving processing due to the ring groove 37 falling. Further, such special-shaped grooving is not easy, and in the case of manual grooving, the sawtooth shape of the lock ring groove 37 having a sawtooth cross section may be erroneously machined in the reverse direction. When such a troubled grooving pipe P is inserted, there is a possibility of causing an accident in which the pipe P is pulled out after construction. Further, in order to confirm the completion of the insertion of the tube P, the visual recognition window 38 is necessary. However, this can be confirmed from the direction of the dark place or the part where the visual recognition window 38 on the outer peripheral wall surface of the receiving port 32 is absent. There were problems such as lack of certainty of confirmation. Furthermore, the pipe P rotates around the pipe axis in the joint body 31 due to the weight of a valve or faucet attached to the pipe P in the course of piping construction, and the predetermined pipe position cannot be maintained. There is also a problem that it requires a cumbersome work to be returned to the position.

One object of the present invention is to solve such problems, and is excellent in workability, and can reliably prevent the occurrence of pipe pull-out accidents and water leakage accidents after construction, and is highly reliable. It is an object to provide a mechanical type pipe joint and a method of tightening a clamp in the pipe joint.
Another object of the present invention is to use an annular clamp that can be expanded and contracted as a mechanical type pipe joint and a headed bolt that tightens the clamp to reduce the diameter. Even if the bolt tightening may be loosened, the clamped state of the clamp can be maintained safely and securely, and the completion of construction can be easily confirmed, and the clamp tightening in the pipe joint It is to provide a method.

The mechanical type pipe joint according to the present invention will be described with reference to the reference numerals attached to FIGS. 1 and 2 for easy understanding of the contents of the invention. A joint body (1) having (5) and a pipe (P) connected to the outer end in the tube axis direction of the receiving portion (5) of the joint body (1) so as to be relatively rotatable and retaining. An annular clamp (2) capable of expanding and contracting to be fitted on the head, a headed bolt (14) provided in the clamp and tightening the clamp to reduce the diameter, and a clip (11) inserted through the headed bolt With.
The joint body (1) includes a pipe end stopper portion (6) that receives the forefront of one end of the pipe (P) on the inner periphery of the receiving portion (5), and an outer portion in the pipe axis direction from the pipe end stopper portion. And an annular rubber packing accommodating portion (7) in which a rubber packing (3) having an inner diameter smaller than the outer diameter of the pipe (P) is accommodated.
On the inner periphery of the projecting end portion of the clamp (2) projecting outward from the outer end portion in the tube axis direction of the receiving portion (5), a taper surface tapered toward the outer side in the tube axis direction ( An annular lock ring receiving groove (13) having 12) is formed, and in the lock ring receiving groove, an expandable / contractable diameter lock ring (4) having a biting tooth (4a) on the inner periphery is housed.
The clamp (2) is formed in a shape having an opening (8) in at least one place on the circumference, and a pair of upper and lower first protrusions formed to protrude radially outward so as to face each other at the opening. , 2 open end portions (22a) and (22b), the first open end portion (22a) has a bolt insertion hole (15), and the second open end portion (22b) has a screw hole (16). The first and second open ends (22a) and (22b) are connected to each other by inserting the headed bolt (14) through the bolt insertion hole (15) and screwing into the screw hole (16). The lock ring (4) is reduced in diameter by tightening it so as to be pulled and the lock ring (4) is reduced in diameter, and the biting teeth (4a) bite into the outer periphery of the pipe (P) inserted into the receiving part (5). It is like that.
The clip (11) is made of a plate material having elasticity, and a web plate (11a) and a pair of upper and lower first and second grip pieces (11b) (11c) bent from both ends of the web plate to the same side. The first gripping piece (11b) is provided with a bolt insertion hole (11d) through which the headed bolt (14) can be inserted, and the first gripping piece (11b) is a bolt. The insertion hole (11d) is inserted into the headed bolt (14), and the seating surface of the head (14a) of the headed bolt (14) and the upper surface (22c) side of the first open end (22a) The second gripping piece (11c) is engaged with the lower surface (22e) side of the second separated end portion (22b) after tightening.

  The clamp tightening method in the mechanical type pipe joint of the present invention will be described with reference to the reference numerals in FIGS. 1 and 2 for easy understanding of the contents of the invention. In the mechanical type pipe joint comprising the joint body (1), clamp (2), rubber packing (3), lock ring (4), head bolt (14), and clip (11) similar to (14) After inserting the bolt insertion hole (11d) of the first grip piece (11b) of the clip (11) into the bolt (14), the headed bolt (14) is inserted into the bolt insertion hole of the first open end (22a) ( 15) and screwed into the screw hole (16) to tighten the clamp (2), the first gripping piece (11b) is connected to the seating surface of the head (14a) of the headed bolt (14) and the first Open While interposing between the upper surface (22c) side of the end portion (22a), the front end side of the second gripping piece (11c) is engaged with the projecting end surface (22d) side of the second opening end portion (22b). As the head bolt (14) is tightened, the diameter of the clamp (2) is reduced so that the first and second open ends (22a) and (22b) are pulled toward each other. The biting teeth (4a) bite into the outer periphery of the pipe (P) that has been reduced in diameter and inserted into the receiving port (5), and the second gripping piece (11c) is second through the elastic deformation of the clip (11). While sliding the projecting end surface (22d) of the open end portion (22b), it moves to the lower surface (22e) side of the second open end portion and finally engages with the lower surface (22e) side. It has a special feature.

According to the mechanical type pipe joint of the present invention, when connecting the pipe, insert one end of the pipe into the receiving part of the joint body from the clamp by hand until the tip of the one end of the pipe hits the pipe end stopper, After that, when the headed bolt is rotated in the tightening direction, the clamp is reduced in diameter, and the lock ring is also reduced due to this diameter reduction action. Can bite into. Therefore, a firm retaining state of the tube can be obtained, and a state can be obtained in which the rubber packing is compressed between the outer peripheral surface of the one end portion of the tube and the inner peripheral surface of the receiving portion to seal the space therebetween.
Since the clamp can be rotated around the receiving portion before the headed bolt is tightened, the headed bolt can be arbitrarily changed to an angle and a position where the headed bolt can be easily turned and the tightening operation can be easily performed.

  Since the lock ring can be securely reduced in diameter by tightening the head bolt and its biting teeth can be securely bited into the outer peripheral surface of the pipe, the lock ring groove is not processed in advance at a predetermined position on one end of the pipe. Further, even if the lock ring groove is processed in advance, strictness is not required for the shape and depth of the groove, and simple groove formation is sufficient.

  By tightening the head bolt, the clamp, the joint body and the pipe can be integrated, so the pipe is difficult to rotate due to the weight of the valve, faucet, etc. Therefore, the pipe can be held at a predetermined piping position, and the piping workability can be promoted.

  Even after the construction, even if the pipe is pulled strongly in the pulling direction due to an earthquake or the like, the lock ring that moves in the same direction with the pipe has a further diameter reducing action due to the taper surface in the lock ring receiving groove. As a result, the bite into the pipe increases, so that it is possible to reliably prevent the one end of the pipe from coming out of the receiving portion, and to ensure the function of preventing the pipe from being pulled out.

Since the first and second open ends of the clamp tightened with the head bolt are firmly held between the first and second gripping pieces of the clip, the head bolt should be damaged or loosened by any chance after construction. Even in the case of slackening, the clamped state of the clamp can be held safely and reliably. Therefore, it is possible to safely and reliably maintain the tube retaining action due to the reduced diameter of the lock ring and the sealing action due to the rubber packing.
Moreover, after completion of construction, it is possible to easily confirm the completion of construction by visually checking the state of the clip attached to the first and second open ends.

  The first grip piece of the clip is inserted into the head bolt between the seat surface of the head of the head bolt and the upper surface side of the first open end, and the second grip piece is the lower surface of the second open end. Since the friction is generated between the contact surface with the lower surface side by being engaged with the side, after the construction, the clip is not detached from the headed bolt and the clamp due to vibration or the like, and the first and second open ends. It is possible to maintain a state of firmly grasping each other.

  According to the tightening method of the clamp in the pipe joint of the present invention, the second gripping piece slides on the projecting end surface of the second separated end portion through the elastic deformation of the clip as the headed bolt is tightened. Since it moves to the back side of the separated end and finally engages with the back side, in addition to the effects described above, the first and second separated ends can be tightened with the clip at the same time as the headed bolt is tightened. It is also possible to grip each other, and there is an effect that the work efficiency can be improved as compared with the troublesome work of attaching the clip after tightening the headed bolt.

  A preferred embodiment of the present invention will be described with reference to the drawings. 1 is a cross-sectional view of a half-cut portion of a mechanical type pipe joint showing an embodiment of the present invention, FIG. 2 is a front view showing a partially broken state before tightening a clamp of the pipe joint of FIG. 2 is a side view seen from the arrow A in FIG. 2, FIG. 4 is a front view showing a state in which the clamp of the pipe joint of FIG. 1 is being tightened, and FIG. 5 shows a state after the clamp of the pipe joint of FIG. FIG. 6 is a half cutaway cross-sectional view showing a state where the pipe is inserted most deeply into the pipe joint of FIG. 1, FIG. 7 shows a clip of the pipe joint of FIG. 1, (a) is a plan view, b) is a side view, and FIG. 8 is an enlarged view of a portion B in FIG.

  1 to 3 and 6, the mechanical type pipe joint according to the present invention includes a joint body 1, a clamp 2, a rubber packing 3, a lock ring 4, and the like. The pipe P connected by this pipe joint is made of a thin stainless steel pipe or the like, and an annular lock ring groove may be provided at a predetermined position on the outer surface near one end portion thereof, but it may not be provided.

  The joint body 1 is formed in a cylindrical shape, and at least one end portion of the joint body 1 is opened with a receiving portion 5 into which one end portion of the pipe P is inserted, and an annular tube end stopper portion 6 is provided on the inner periphery of the receiving portion 5. In addition, an annular rubber packing housing portion 7 formed side by side on the outer side in the tube axis direction from the tube end stopper portion 6 is provided so as to be located at a position biased radially outward from the tube end stopper portion 6. The rubber packing housing 7 accommodates the rubber packing 3 having an inner diameter smaller than the outer diameter of the pipe P.

  On the other hand, as shown in FIGS. 2 and 3, the clamp 2 is formed in an annular shape with a C-shaped cross section having a separation portion 8 at one place on the circumference so that the diameter can be expanded and contracted. The first and second open end portions 22a and 22b are formed to project outward in the radial direction so as to face each other. In the free state, the clamp 2 includes a large-diameter cylindrical portion 21 having an inner diameter portion that is slightly larger than the outer diameter of the receiving portion 5 of the joint body 1, and an inner diameter portion having substantially the same diameter as the inner diameter of the receiving portion 5. It is formed in the stepped cylinder shape which has the small diameter cylinder part 22 which has. As shown in FIG. 1, the clamp 2 forms a concave groove 9 on the inner periphery of the large-diameter cylindrical portion 21, and the concave groove 9 is formed on the flange portion 10 provided on the outer periphery of the receiving portion 5 of the joint body 1. By fitting, the tube body of the joint body 1 can be rotated relative to the outer end portion in the tube axis direction of the receiving portion 5 and in a retaining shape, and the small diameter cylindrical portion (projecting end portion) 22 is the tube shaft of the receiving portion 5. It connects so that it may protrude from a direction outer side edge part.

  In FIG. 1, the taper surface 12 is formed in the inner periphery of the small-diameter cylindrical portion 22 of the clamp 2 that protrudes outward from the outer end portion in the tube axis direction of the receiving port portion 5. An annular lock ring receiving groove 13 having the shape is formed. In the free state, the lock ring receiving groove 13 is formed of a ring-shaped (C-shaped) metal ring whose inner diameter is smaller than the outer diameter of the pipe P, and is formed to be freely deformable and expandable. A lock ring 4 having a biting tooth 4a and having an expandable / contractable diameter can be accommodated.

  As shown in FIGS. 2 and 3, a headed bolt 14 is attached to the clip 11 at a pair of upper and lower first and second open end portions 22 a and 22 b facing each other at the open portion 8 of the small diameter cylindrical portion 22 of the clamp 2. Are inserted and inserted. A bolt insertion hole 15 through which the headed bolt 14 is freely fitted is formed in the first opening end 22a, and a screw hole 16 to be screwed with the male screw of the heading bolt 14 is formed in the second opening end 22b. Yes. A nut can be used instead of the screw hole 16.

  The clip 11 is made of a plate material having elasticity such as a steel plate having a relatively large thickness, and is bent to the same side from both ends of the web plate 11a and the web plate 11a as shown in FIGS. 7 (a) and 7 (b). A bolt insertion hole 11d is formed in a U-shaped cross section having a pair of upper and lower first and second gripping pieces 11b and 11c, and a headed bolt 14 can be inserted in a loose fit in the first gripping piece 11b. Yes. Then, the clip 11 is inserted into the bolt 14 with the head through the bolt insertion hole 11d of the first gripping piece 11b.

  Next, the clamp 2 is connected to the joint body 1 as described above, and the rubber packing 3 and the lock ring 4 are built in, and the headed bolts 14 are attached to the first and second open ends 22a and 22b of the clamp 2. The procedure for connecting the pipe P to the pipe joint inserted with the clip 11 will be described.

  First, as shown in FIG. 6, one end portion of the pipe P is inserted into the receiving portion 5 of the joint body 1 from the clamp 2. At this time, the leading end of the one end portion of the pipe P is inside the lock ring 4 and the rubber packing. 3 until the tube end stopper 6 is reached.

  Next, the head bolt 14 is rotated in the tightening direction to tighten the clamp 2. Prior to this, as shown in FIGS. 2 and 3, the bolt insertion hole 11d of the first gripping piece 11b of the clip 11 is headed. After being inserted into the bolt 14 in a loose fit, the headed bolt 14 is inserted into the bolt insertion hole 15 of the first open end 22a and screwed into the screw hole 16, and the first gripping piece 11b is attached to the head. The bolt 14 is interposed between the seating surface of the head portion 14a and the upper surface 22c side of the first opening end 22a, and the tip end side of the second gripping piece 11c is on the protruding end surface 22d side of the second opening end 22b. Engage with. Thereafter, when the headed bolt 14 is rotated in the tightening direction, as shown in FIGS. 4 and 5, the clamp 2 reduces the diameter while pulling the first and second open end portions 22a and 22b toward each other. As the clamp 2 is reduced in diameter, the lock ring 4 is also reduced in diameter. Before tightening the head bolt 14, the head bolt 14 can be arbitrarily changed to a desired angle and position where the head bolt 14 can be easily operated by rotating the clamp 2 around the receiving portion 5 via the collar portion 10. Work can be done easily.

  When the headed bolt 14 is completely tightened, the clamp 2 is most contracted, and at the same time the lock ring 4 is contracted the most, so that the biting teeth 4a bite into the outer peripheral surface of the pipe P (see FIG. 8). The inner diameter of the tube P is surely smaller than the outer diameter of the tube P, so that the tube P is securely retained. Therefore, the lock ring groove does not have to be processed in advance at a predetermined position on one end of the pipe P, and even if the lock ring groove is processed in advance, strictness is not required for the shape and depth of the groove. Simple grooving is sufficient, and even in this case, extraction of the tube P can be reliably prevented. At the same time that the tube P is securely pulled out, the rubber packing 3 is compressed between the inner peripheral surface of the receiving port 5 and the outer peripheral surface of one end of the tube P, so that there is no water leakage between them. can get.

  As the head bolt 14 is tightened in this manner, the diameter of the lock ring 4 is reduced, and the biting teeth 4a bite into the outer periphery of the pipe P. At the same time, the tip of the second gripping piece 11c is moved through the elastic deformation of the clip 11. 2. While sliding down the projecting end surface 22d of the separating end 22b, the second separating end 22b moves toward the lower surface 22e and finally engages with the lower surface 22e (see FIGS. 4 and 5). In order to make the second gripping piece 11c slip easily on the projecting end surface 22d of the second separated end 22b as the head bolt 14 is tightened, the second gripping piece 11c projects from the upper surface 22f of the second separated end 22b. It is preferable that a tapered surface 22g is formed at the corner angle where the end surface 22d meets, and the tip of the second gripping piece 11c is initially positioned on the tapered surface 22g.

  Since the first gripping piece 11b of the clip 11 is inserted into the headed bolt 14 between the seating surface of the head 14a of the headed bolt 14 and the upper surface 22c side of the first open end 22a, the headed bolt The clip 11 is not detached from the clamp 2 at the time of tightening 14. In addition, the clip 11 has the first gripping piece 11b inserted through the headed bolt 14, and the second gripping piece 11c is engaged with the lower surface 22e side of the second open end 22b so as to be connected to the lower surface 22e side. Since friction is generated between the contact surfaces, the clip 11 does not detach from the head bolt 14 and the clamp 2 due to vibration or the like after construction, and firmly holds the first and second open ends 22a and 22b. Maintain the state you have. Accordingly, the first and second open end portions 22a and 22b of the clamp 2 tightened with the head bolt 14 are firmly held between the first and second gripping pieces 11b and 11c of the clip 11, so that after the work, Even if the headed bolt 14 is damaged or loosened, the clamped state of the clamp 2 can be safely and reliably maintained. Therefore, it is possible to safely ensure the action of preventing the pipe P from being pulled out by the diameter of the lock ring 4 and the sealing action of the rubber packing 3.

  By tightening the clamp 2 with the headed bolt 14, the large-diameter cylindrical portion 21 of the clamp 2 is firmly tightened integrally with the outer periphery of the receiving portion 5 of the joint body 1 with the flange 9 interposed therebetween, and the clamp 2, the joint body 1, Since the clamp 2 and the pipe P can be integrated through the biting of the biting teeth 4a of the lock ring 4 into the pipe P, the pipe P is attached to the pipe P in the course of this pipe construction. The pipe P is difficult to rotate due to the weight of the appliance such as the valve and the faucet, and thus the pipe P can be held at a predetermined piping position and the piping workability can be improved.

  As described above, the clip 11 is attached to hold the first and second open ends 22a and 22b simultaneously with the complete tightening of the head bolt 14, so that the completion of the construction can be easily confirmed by visually checking the attached state. can do.

  Even after the construction, even if the pipe P is strongly pulled in the pull-out direction due to an earthquake or the like, the lock ring 4 that moves in the same direction together with the pipe P is further fixed by the taper surface 12 in the lock ring receiving groove 13. Since the erosion into the pipe P increases due to the reduced diameter action, it is possible to reliably prevent the one end of the pipe P from coming out of the receiving portion 5.

  Even when the insertion of the pipe P is stopped before the end of the pipe P reaches the pipe end stopper 6 when the insertion of the pipe P is insufficient, the biting teeth 4a of the lock ring 4 are tightened by tightening the head bolts 14. However, even if this is insufficiently inserted, the accident of pulling out the pipe P does not occur.

  In the above-described embodiment, the clamp 2 is formed in a C-shaped cross section by providing an opening 8 at one place on the circumference, but instead of this, the clamp 2 has a relative circumference as shown in FIG. It is also possible to provide the split parts 8 and 8 in two facing directions to form a two-split type. In this case, the first and second open ends 22a and 22b facing each other at each open portion 8 are fastened together with the clip 11 with the headed bolts 14 and tightened in the same manner as in the above embodiment. At the same time that the clamp 2 is reduced in diameter, the lock ring 4 is also reduced in diameter, and the second gripping piece 11c of the clip 11 slides down the protruding end face 22d of the second opening end 22b while the lower surface of the second opening end 22b. 22e side is engaged.

  The lock ring 4 that can be deformed to expand and contract is only required to have a shape having the biting teeth 4a on the inner periphery. As shown in the sectional shape shown in FIG. It is not limited to what is formed. In addition, for example, it may be in the form of forming a toothed tooth 4a having a triangular cross section as shown in FIG.

  In addition, this invention is applicable similarly when the said coupling main body 1 is an elbow or a T type other than the socket type of the example of illustration.

1 is a half-broken cross-sectional view of a mechanical type pipe joint showing one embodiment of the present invention. FIG. 2 is a front view showing a partially broken state before the clamp of the pipe joint of FIG. 1 is tightened. It is the side view seen from the arrow A in FIG. It is a front view which shows the state in the middle of tightening the clamp of the pipe joint of FIG. It is a front view which shows the state after tightening the clamp of the pipe joint of FIG. FIG. 2 is a half-broken cross-sectional view showing a state where a pipe is inserted most deeply into the pipe joint of FIG. 1. The clip of the pipe joint of Drawing 1 is shown, (a) is a top view and (b) is a side view. It is an enlarged view of the B section in FIG. It is a front view which shows the clamp of the pipe joint of another Example corresponding to FIG. It is a partial cross section figure which shows the other example of the lock ring integrated in the pipe joint of FIG. FIG. 6 is a half-broken cross-sectional view of a state when a pipe is inserted most deeply into a conventional insertion-type pipe joint. FIG. 12 is a partial cross-sectional view of the state when the tube is inserted into the insertion-type pipe joint of FIG.

Explanation of symbols

P pipe 1 joint body 2 clamp 3 rubber packing 4 lock ring 4a biting tooth 5 receiving portion 6 pipe end stopper portion 7 rubber packing accommodating portion 8 opening portion 11 clip 11a web plate 11b first gripping piece 11c second gripping piece 11d Bolt insertion hole 12 Taper surface 13 Lock ring receiving groove 14 Bolt with head 15 Bolt insertion hole 16 Screw hole 22 Projection end 22a First opening end 22b Second opening end 22c Upper surface 22d Projection end surface 22e Lower surface

Claims (2)

A joint body having a receiving part into which one end of the pipe is inserted, and a joint body connected to the outer end in the pipe axis direction of the joint part of the joint body so as to be rotatable relative to the pipe body and fitted to the pipe. An expandable / reducible ring-shaped clamp, a headed bolt which is provided in the clamp and tightens the clamp to reduce the diameter, and a clip inserted through the headed bolt,
The joint body is formed by arranging a tube end stopper portion receiving the forefront of the one end of the tube on the inner periphery of the receiving portion, and arranged side by side on the outer side in the tube axis direction from the tube end stopper portion, and from the outer diameter of the tube An annular rubber packing accommodating portion for accommodating a rubber packing having a small inner diameter portion;
An annular lock ring having a taper surface tapered toward the outside in the tube axis direction on the inner periphery of the projecting end portion of the clamp projecting outward from the tube shaft direction outer end portion of the receiving portion An accommodation concave groove is formed, and in the lock ring accommodation concave groove, an expandable / contractable diameter lock ring having a dent tooth on the inner periphery is accommodated,
A pair of upper and lower first and second separated end portions, wherein the clamp is formed in a shape having an opening at at least one place on the circumference, and protrudes radially outward so as to face each other at the opening. A bolt insertion hole at the first opening end and a screw hole at the second opening end, and the headed bolt is inserted into the bolt insertion hole and the screw hole A tube in which the lock ring is reduced in diameter by being tightened so that the pair of first and second open end portions are attracted to each other by screwing and the clamp ring is reduced in diameter, and is inserted into the receiving portion. The biting teeth are biting into the outer periphery of the
The clip is made of a plate material having elasticity, and is formed into a U-shaped cross section having a web plate and a pair of upper and lower first and second grip pieces bent to the same side from both ends of the web plate, The first gripping piece is provided with a bolt insertion hole through which the headed bolt can be inserted. The first gripping piece is inserted through the bolt insertion hole into the headed bolt, and the head of the headed bolt And the second gripping piece is engaged with the lower surface side of the second separated end portion after tightening. Mechanical type pipe fitting. A joint body having a receiving part into which one end of the pipe is inserted, and a joint body connected to the outer end in the pipe axis direction of the joint part of the joint body so as to be rotatable relative to the pipe body and fitted to the pipe. Tightening of a clamp in a mechanical type pipe joint comprising: an annular clamp that can be expanded and contracted; a head bolt that is provided in the clamp and that tightens the clamp to reduce the diameter; and a clip that is inserted into the head bolt. In the method
The joint body is formed by arranging a tube end stopper portion receiving the forefront of the one end of the tube on the inner periphery of the receiving portion, and arranged side by side on the outer side in the tube axis direction from the tube end stopper portion, and from the outer diameter of the tube An annular rubber packing accommodating portion for accommodating a rubber packing having a small inner diameter portion;
An annular lock ring having a taper surface tapered toward the outside in the tube axis direction on the inner periphery of the projecting end portion of the clamp projecting outward from the tube shaft direction outer end portion of the receiving portion An accommodation concave groove is formed, and in the lock ring accommodation concave groove, an expandable / contractable diameter lock ring having a dent tooth on the inner periphery is accommodated,
A pair of upper and lower first and second separation end portions formed so that the clamp has a separation portion at least at one place on the circumference and projecting radially outward so as to face each other at the separation portion. A bolt insertion hole in the first open end, and a screw hole in the second open end,
The clip is made of a plate material having elasticity, and is formed into a U-shaped cross section having a web plate and a pair of upper and lower first and second grip pieces bent to the same side from both ends of the web plate, A bolt insertion hole through which the head bolt can be inserted in the first grip piece;
After inserting the bolt insertion hole of the first gripping piece into the head bolt, the head bolt is inserted into the bolt insertion hole of the first opening end and screwed into the screw hole. When tightening, the first gripping piece is interposed between the seat surface of the head of the headed bolt and the upper surface side of the first open end, and the tip end side of the second gripping piece is the second side. The lock ring is engaged by engaging with the projecting end face side of the open end and reducing the diameter of the clamp so that the first and second open ends are pulled toward each other as the head bolt is tightened. And the bite teeth bite into the outer periphery of the tube inserted into the receiving part and the second grip piece slides on the protruding end surface of the second open end part through elastic deformation of the clip. While under the second open end How tightening of the clamp in mechanical type pipe joint, characterized in that is adapted to engage the final lower surface side by moving to the side.

Images