JP5164668B2 - Pipe joint structure, pipe fittings equipped with this - Google Patents

Description

  The present invention relates to a pipe joint structure that can be widely used when piping various pipe bodies for water supply and drainage, and a pipe joint provided with the pipe joint structure.

  Conventionally, for example, there are the following types of joint structures for this type of tubular body. That is, in this conventional one, a cap nut is rotatably fitted to one end portion of a socket, and a nipple is inserted to the one end portion. Further, the lock pin with the tip protruding from the inner peripheral surface of the cap nut is slidably engaged with an inlay groove provided on the outer peripheral surface of the nipple, and both are connected.

Furthermore, in order to prevent the reverse rotation of the cap nut and maintain the connection state between the socket and the nipple, the nipple can be fitted with an uneven ratchet provided on one end face of the cap nut in a biased state. Steel balls are provided. Each of these members is made of metal.
JP-A-9-14533

  However, there is no particular problem when each component of the pipe joint is made of metal like the above conventional one, but when the socket or cap nut is made of a synthetic resin such as vinyl chloride. There were the following problems.

  That is, when connecting the socket and the nipple, the cap nut is rotated so that the lock pin provided on the cap nut moves to the end of the spigot groove. However, since the steel ball of the nipple is in contact with the ratchet in the biased state during the rotation, the ratchet is likely to be damaged such as wear. For this reason, there has been a problem that the cap nut rotates inadvertently and the circulating fluid leaks from the joint portion.

  In this case, instead of the steel ball, it is also possible to bulge and form a convex portion that fits into the ratchet. However, even if it changes in this way, it is difficult to avoid generation | occurrence | production of damage, such as abrasion which arises in a convex part and a ratchet, and the said problem cannot be eliminated.

  Further, the above-described conventional means for fitting the steel ball to the ratchet in the biased state is not necessarily sufficient as the reverse rotation preventing means. That is, when an external force is inadvertently applied to the joint portion, the fitting state between the steel ball and the ratchet is easily released.

  Therefore, the present invention has been made to solve the above-mentioned conventional problems, and the object of the present invention is to appropriately prevent a situation in which the fixing ring is inadvertently reversely rotated with respect to the joint body. Thus, it is possible to reliably maintain a good piping state of the tubular body.

  In order to solve the above-mentioned problems, a pipe joint structure according to the present invention includes a joint main body into which a pipe body is inserted, a fixing ring through which the pipe body is inserted and attached to the joint main body by a rotating operation, and the joint A tubular joint structure provided with a locking means provided on the fixing ring to prevent the reverse rotation of the fixing ring by locking with the main body, the locking means being slidable on the fixing ring The stopper comprises an annular stopper body that is externally fitted, and a plurality of locking pieces that protrude from the stopper body at a predetermined interval and can be locked to the joint body.

  In the above-described pipe joint, first, with the pipe body to be piped inserted through the fixing ring, the fixing ring is rotated and fixed to the joint body. Thereafter, the stopper body is slid to the joint body side, and the respective locking pieces of the stopper are locked to the joint body. Thereby, reverse rotation of the fixing ring is prevented.

  According to this, since the locking piece of the stopper is locked to the joint body, it is possible to appropriately prevent the fixing ring from rotating in the reverse direction. Therefore, the favorable connection state of the tubular body can be reliably maintained.

  Further, when the fixing ring is fixed to the joint body, it is possible to provide the joint body with a notch or a hole in which the stopper piece of the stopper can be locked.

  According to this, it is possible to prevent reverse rotation while maintaining the fixed state of the fixing ring by a simple operation of locking the locking piece of the stopper to the notch or the hole of the joint body. As a result, a good connection state of the tube can be reliably maintained.

  In this way, it can be easily confirmed from the outside that the fixing ring is securely locked to the joint body and the fixing ring does not rotate backward. In addition, it can be easily confirmed from the outside that the fixing ring has been completely rotated and the connection state of the tubular body is good because the stopper locking piece is locked in the notch or hole of the joint body. be able to. Thereby, the certainty of the piping work is improved.

  Furthermore, you may form the engaging part which can be engaged with a coupling main body in the internal peripheral surface of the locking piece of the said stopper.

  According to this, when the engaging part of the stopper is engaged with the joint main body, the engagement state between the joint main body and the stopper locking piece is maintained well. Therefore, reverse rotation of the fixing ring can be prevented more reliably.

  Moreover, you may provide the mark which can confirm from the exterior whether the latching piece of a stopper is latched by the joint main body to the said fixing ring.

  If it does in this way, since it can confirm easily from the exterior that the latching piece of the stopper was latched by the coupling main body, and the reliability of a series of work | work will improve. In addition, this is very useful for workers, and the work efficiency at the site is improved.

  Furthermore, the pipe joint according to the present invention has a pipe joint structure.

  Thereby, the pipe joint which has the effect mentioned above can be obtained.

  Further, according to the present invention, there is provided a pipe joint structure and a main body provided with the pipe joint structure.

  Thus, it is possible to obtain the above-described effects.

  According to the present invention, it is possible to appropriately prevent a situation in which the fixing ring fixed to the joint body rotates inadvertently, so that it is possible to reliably maintain a good piping state of the tubular body. Play.

<First embodiment>
The best mode for carrying out a pipe joint structure according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a front view including a partial cross section illustrating a joint structure of a tubular body according to the present embodiment. Reference numeral 1 in the drawing is a joint body provided with a branch portion 3 on the side surface of the straight pipe portion 2, and a connecting portion 5 is provided on each of the straight pipe portion 2 and the distal end side of the branch portion 3 via a flange 4. It has been.

  As shown in FIG. 2, the notch 6 is formed with three notches 6 at a predetermined interval. Further, on the side surface of the connecting portion 5, as shown in the figure, three engagement grooves 7 are provided with a predetermined interval. The engaging groove 7 has an insertion portion 8 formed in the tube axis direction, a first straight portion 9 provided horizontally and orthogonally to the insertion portion 8, and a predetermined angle with respect to the first straight portion 9. It consists of the inclined part 10 provided continuously and the horizontal second straight part 11 provided continuously to the inclined part 10. A curved convex portion 12 bulges out at a substantially central portion of the second straight portion 11. As shown in FIG. 3, reference numeral 40 denotes a convex portion provided with a tapered surface 41 on the insertion side of the insertion portion 8 of the engagement groove 7.

  Reference numeral 13 denotes a fixing ring attached to the connecting portion 5 of the joint body 1. The fixing ring 13 is used for connecting the tube body X to the joint body 1 by pressing a seal body 30 (to be described later) against the outer peripheral surface of the tube body X by its rotational operation. As shown in FIG. 3, three engagement convex portions 14 slidably engaged with the engagement grooves 7 of the joint body 1 are provided on the inner peripheral surface of the one end side of the fixing ring 13 with a predetermined interval. It has been. When the fixing ring 13 is attached to the joint main body 1, the insertion convex portion 14 of the fixing ring 13 is inserted over the tapered surface 41 and the convex portion 40 provided in the engaging groove 7 of the joint main body 1. 8 is inserted. Thereby, the integrity of the fixing ring 13 and the joint body 1 is maintained. Therefore, if it is manufactured up to this state in advance in a factory or the like, it is possible to simplify the transfer work to the site and the piping work at the site, and the work efficiency is greatly improved. Further, it is possible to satisfactorily avoid a situation in which each component such as the fixing ring 13 is lost. Note that the fixing ring 13 is not necessarily provided so as not to be detached from the joint body 1 as described above, and may be configured to be removable.

  As shown in FIG. 4, reference numeral 15 denotes a collar provided at one end of the fixing ring 13. Three notches 16 are formed in the flange 15 with a predetermined interval. These three cutouts 16 are formed on the flange 4 of the joint body 1 when the engagement protrusion 14 of the fixing ring 13 is moved to the end of the second straight portion 11 of the engagement groove 7 of the joint body 1. It is formed at a position that matches the notch 6. Reference numeral 17 is an annular convex portion provided inwardly on the inner peripheral surface of the other end of the fixing ring 13. The outer peripheral surface on the other end side of the fixing ring 13 is formed in a polygonal shape.

  As shown in FIG. 5, reference numeral 18 denotes a stopper that is slidably fitted to the fixing ring 13. As shown in the figure, the annular stopper body 19 has three locking pieces 20 protruding upward with a predetermined interval. The number of the locking pieces 20 can be changed, and the number of the notches 6 and 16 of the joint body 1 and the fixing ring 13 may be changed as appropriate. An engaging portion 21 is provided on the inner peripheral surface of the distal end portion of the locking piece 20. The locking piece 20 is engaged with the notch 6 of the joint body 1 through the notch 16 of the fixing ring 13, and the engaging part 21 is engaged with the flange part 4 to prevent the fixing ring 13 from rotating backward. To do. As shown in FIG. 4, reference numeral 22 denotes a tape as a mark adhered to the outer peripheral surface of the fixing ring 13. Based on whether or not the mark 22 is exposed to the outside, it can be visually confirmed from the outside whether or not the engaging portion 21 of the stopper 18 is engaged with the flange portion 4 of the joint body 1. .

  Reference numeral 23 denotes a pair of annular bodies that are rotatably fitted in the fixing ring 13. As shown in FIG. 6, two steps 24 and 25 are provided on the inner peripheral surface of the one end side of the annular body 23. The outer step portion 24 includes a peripheral surface portion 26, a taper portion 27, and an inner wall portion 28. In addition, two annular convex portions 29 are provided on the outer peripheral surface of the annular body 23 with a predetermined interval. It should be noted that the outer diameter of the annular convex portion 29 is set slightly smaller than the inner diameter of the fixing ring 13. For this reason, the annular body 23 is rotatably fitted in the fixing ring 13.

  Reference numeral 30 denotes a rubber seal body fitted to the outer stepped portion 24 so as to be disposed between a pair of annular bodies 23 arranged to face each other as shown in FIG. In this state, a gap 42 is formed between the annular bodies 23. Reference numeral 31 denotes a concave portion having a substantially V-shaped cross section formed at a substantially central portion of the outer peripheral surface of the seal body 30.

  As shown in FIG. 8, the depth A of the concave portion 31 of the seal body 30 is such that A> B with respect to the height B of the tapered portion 27 and the inner wall portion 28 of the annular body 23. Is set. In this case, A = B may be set. Further, the angle Θ with respect to the axial direction of the tapered portion 27 of each annular body 23 is set to 45 °, which is the same angle. In a state in which the seal body 30 is mounted on the pair of annular bodies 23, the gap width C between the end faces of the opposed annular bodies 23 is smaller than the width D of the concave portion 31 of the seal body 30. Further, a gap width E formed by the end face of the seal body 30 and the step portion 25 inside the annular body 23 facing the end face is set as small as possible.

  Further, as shown in the figure, the inner diameter F of the sealing body 30 is set slightly larger than the inner diameter G of the annular body 23, and the inner diameter G of the annular body 23 is set slightly larger than the outer diameter of the pipe body to be connected. ing. The annular body 23 is made of a synthetic resin such as Duracon, and the joint body 1 and the fixing ring 13 are made of a synthetic resin such as vinyl chloride.

  Reference numeral 32 denotes an O-ring mounted in a groove 33 formed in an annular shape on the end face of the joint body 1 as shown in FIG. When the fixing ring 13 is attached to the joint body 1, the back surface of the annular body 23 positioned on the inner side comes into contact with the end face of the joint body 1, and the O-ring 32 seals. Note that a lubricant is applied to the surface of the O-ring 32.

  The present embodiment is configured as described above. Next, the case where pipes, such as a water supply pipe and a drain pipe, are piped using this joint is explained.

  First, the tube X to be connected to the fixing ring 13 is inserted. In the present embodiment, the inner diameter F of the seal body 30 is set slightly larger than the inner diameter G of the annular body 23, and the inner diameter G of the annular body 23 is set larger than the outer diameter of the tube X to be connected. Moreover, since the gap width E formed by the end face of the seal body 30 and the step portion 25 inside the annular body 23 facing the end face is set as small as possible, the tube body X can be inserted smoothly.

  Next, as shown in FIG. 9, the fixing ring 13 is pressed toward the joint body 1, and the engagement convex portion 14 of the fixing ring 13 is moved to the end of the insertion portion 8 of the engagement groove 7. At that time, since the outer annular body 23 is pressed by the annular convex portion 17 of the fixing ring 13, the pair of annular bodies 23 and the seal body 30 move together to the joint body 1 side, and the inner annular body The back surface of 23 comes into contact with the end surface of the joint body 1.

  Further, when the fixing ring 13 is rotated as shown in FIG. 10, the engaging convex portion 14 slides on the second linear portion 11 through the first linear portion 9 and the inclined portion 10 of the engaging groove 7, and the second It moves over the convex part 12 provided in the straight line part 11 to its end.

  When the engaging convex portion 14 moves on the inclined portion 10 of the engaging groove 7, the seal body 30 is pressed by the annular convex portion 17 of the fixing ring 13 through the outer annular body 23. At this time, since the movement of the inner annular body 23 is restricted by the joint body 1, the seal body 30 receives the pressing force and bends, and bulges inward so that its inner diameter F is reduced. It will press-contact with the outer peripheral surface of X.

  In this case, the seal body 30 is pressed by the tapered portion 27 and the inner wall portion 28 of the step portion 24 of the annular body 23. The tapered portion 27 and the inner wall portion 28 of the annular body 23 are combined. The height B is set to be smaller than the depth A of the concave portion 31 of the seal body 30. Therefore, when the fixing ring 13 is rotated, a pressing force is applied so that the concave portion 31 of the seal body 30 is closed as shown in the figure, and the seal body 30 swells inward. For this reason, the tube body X can be easily connected without applying much rotational force to the fixing ring 13.

  Further, since the angle Θ with respect to the axial direction of the tapered portion 27 of each annular body 23 is set to 45 °, which is the same angle, a pressing force is applied from the annular bodies 23 to the sealing body 30 almost evenly, so that no deviation occurs. It will bulge inward. Therefore, there is an advantage that a sufficient pressure contact area with respect to the tube body X of the seal body 30 can be secured.

  Further, in a state where the seal body 30 is mounted on the pair of annular bodies 23, the gap width C between the end faces of the opposed annular bodies 23 is smaller than the width D of the concave portion 31 of the seal body 30. The body 30 does not bulge outward from between the annular bodies 23 and contacts the inner peripheral surface of the fixing ring 13. Therefore, the rotational torque of the fixing ring 13 is not increased. Further, the sealing body 30 does not hinder the rotation of the joint body 1.

  Further, when the sealing body 30 is pressed against the tube X, the sealing body 30 and the annular body 23 are fixed without rotating by the pressing, and only the fixing ring 13 can be rotated. Are in contact with only the two annular projections 29 of each annular body 23, and the annular body 23 is made of a duracon that is slippery and can be easily rotated. Therefore, it becomes easy to work.

  Thereafter, the locking piece 20 of the stopper 18 is slid to the joint body 1 side, the locking piece 20 is engaged with the notch 6, and the engaging portion 21 is engaged with the flange portion 4 of the joint body 1. . As a result, the mark 22 provided on the fixing ring 13 is exposed, and it can be visually confirmed from the outside that the stopper 18 functions reliably. As a result, a series of connection work of the tube body X is completed, but such a series of connection work has an advantage that it can be performed very easily. Therefore, even in a situation where the work space is limited, it is possible for the operator. A series of piping operations can be performed efficiently and without burden.

  In addition, the tube X connected in this way is engaged with the engagement between the projection 12 provided in the engagement groove 7 of the joint body 1 and the engagement projection 14 of the fixing ring 13 and the joint body 1 of the stopper 18. The reverse rotation is prevented by engaging with the notch 6, and the connection state of the tube body X is firmly maintained. Therefore, it is possible to reliably prevent a situation where the fixing ring 13 rotates inadvertently and the circulating fluid leaks or the tube body X is detached from the joint body 1.

  On the other hand, when the pipe body X is removed from the joint, the stopper 18 is slid to the pipe body X side (right direction in FIG. 10), and the engagement portion 21 and the flange portion 4 of the joint body 1 are engaged. While releasing the state, the locking piece 20 of the stopper 18 is detached from the notch 6 of the flange portion 4. It can be confirmed from the outside that the mark 22 is concealed by the stopper body 19 of the stopper 18.

  Next, when a slightly strong rotational force is applied to rotate the fixing ring 13 in the opposite direction, the convex portion 12 provided in the engagement groove 7 of the joint body 1 is formed in a curved shape. The engagement state between the projection 12 and the engagement projection 14 of the fixing ring 13 is released. Furthermore, the fixing ring 13 is rotated to a position where the engaging convex portion 14 faces the convex portion 40 provided in the insertion portion 8 of the engaging groove 7.

  In addition, since the pressing force from the outer annular body 23 is removed by the engagement convex portion 14 moving in the reverse direction on the inclined portion 10 of the engagement groove 7, the inner diameter F of the seal body 30 is increased. The diameter returns to the original state. Thereby, since the press-contact state with the pipe body X is cancelled | released, the pipe body X can be easily removed from a coupling.

  Further, in this state, since the fixing ring 13 and the annular body 23 are rotatably fitted, the fixing ring 13 and the joint body 1 are connected to the annular body 23, the seal body 30 and the tube body X. It is possible to rotate.

  Therefore, when the installation location of the water supply / drainage device is changed due to a layout change after the construction of the piping, for example, when the arrangement of the pipe X to be piped to the branch portion 3 of the joint body 1 is changed, FIG. As shown above, after the branch part 3 of the joint body 1 is appropriately rotated according to the position of the pipe body X to be newly connected, the new pipe body X is connected to the branch part 3 as described above. Just do it. In this way, it is possible to respond quickly and flexibly to changes in the layout after the construction of the piping. In addition, when the arrangement | positioning of the pipe body X which should be piping to the straight pipe part 2 of the coupling main body 1 changes, it can respond similarly.

  Moreover, since the joint structure of the tubular body according to the present embodiment has an extremely simple structure as a whole, it has an advantage that it can be manufactured easily and inexpensively.

  In the above-described embodiment, the notch 6 is provided in which the locking piece 20 of the stopper 18 can be locked when the fixing ring 13 is fixed to the joint body 1. However, the notch 6 may be omitted.

  Moreover, about the notch 6 of the said coupling main body 1, it may replace with this and the hole which can latch the latching piece 20 of the said stopper 18 may be formed. Further, for example, the outer peripheral surface of the flange 4 of the joint body 1 may be formed in a polygonal shape, and the locking piece 20 may be locked to the outer peripheral surface.

  Furthermore, in the said embodiment, although the engaging part 21 which can be engaged with the coupling main body 1 was formed in the internal peripheral surface of the locking piece 20 of the stopper 18, this engaging part 21 does not necessarily need to form, It can be omitted.

  In addition, the mark 22 provided on the fixing ring 13 in the present invention is not limited to the above embodiment, and also when checking whether the locking piece 20 of the stopper 18 is locked to the joint body 1 widely. Can be applied.

  Further, as the mark 22 provided on the fixing ring 13, for example, a ring may be externally fitted or a paint or the like may be provided in addition to the annular tape of the above embodiment. In this case, contrary to the above embodiment, when the engaging portion 21 of the stopper 18 is engaged with the joint body 1, the mark 22 may be hidden by the stopper body 19. However, the mark 22 is not necessarily provided.

  In addition, the pipe joint according to the present invention is particularly useful when the joint body 1 has the branch part 3 as in the above embodiment, but the present invention only includes the straight pipe part 2 that does not have the branch part 3. Of course, it is applicable also to the coupling main body 1 comprised by these.

  In addition, specific configurations such as the shapes of the joint body 1 and the fixing ring 13 can be arbitrarily changed within the intended scope of the present invention.

<Second embodiment>
The joint structure of a pipe body according to the present invention is not limited to the pipe joint as in the first embodiment, and can be applied more and more as follows. Hereinafter, the slab provided with the pipe joint structure Y will be described with reference to FIGS. 12 and 13. In addition, about the part which is common in 1st embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  Z shown in FIG. 12 includes a main body 52 in which an inflow portion 50 and an outflow portion 51 corresponding to the straight pipe portion 2 and the branch portion 3 of the joint main body 1 are formed, and the inflow portion 50 and the outflow portion 51. It consists of the joint structure Y of the provided pipe body. An inspection port 53 is formed in the upper part of the main body 52.

  Further, Z shown in FIG. 13 is one in which an inflow portion 50 and an outflow portion 51 are formed so as to face the side portion of the main body 52, and a pipe joint Y is provided in each of the inflow portion 50 and the outflow portion 51. Is provided. An inspection port 53 is formed in the upper part of the main body 52.

  As described above, even when the joint structure Y of the tubular body is applied, the same effect as described above can be obtained.

  In this case, the specific configuration such as the shape is not limited as in the above embodiment.

  As described above, the present invention is useful as a joint structure for a pipe connected to a pipe.

It is sectional drawing which shows one Embodiment of the joint structure of a tubular body. It is a front view which shows a part of joint body. It is sectional drawing which shows the state which attached the fixing ring to the coupling main body. (A) is a top view of a fixing ring, (b) is the sectional drawing. (A) is a top view of a stopper, (b) is the front view. (A) is a top view of an annular body, (b) is the sectional view. It is sectional drawing which shows the state which mounted | wore the annular body with the seal body. It is sectional drawing which shows the state which mounted | wore the annular body with the seal body. It is sectional drawing which shows the state which inserted the pipe body in the coupling. It is sectional drawing which shows the state which inserted and fixed the pipe body to the coupling. It is a front view which shows the use condition of a coupling. It is sectional drawing which shows one Embodiment. It is sectional drawing which shows another one Embodiment.

Explanation of symbols

1 Joint body 6 Notch 13 Fixing ring 18 Stopper 19 Stopper body 20 Locking piece 21 Engagement part 22 Marking mark 52 Main body X Tube

Claims (10)

A fitting body into which the pipe is inserted;
A fixing ring that is inserted into the tube body and attached to the joint body by a rotating operation;
Locking means provided on the fixing ring to lock the joint body and prevent reverse rotation of the fixing ring;
Equipped with a,
The joint body and the fixing ring each have a flange on the outer peripheral surface,
The locking means is
An annular stopper body that is slidably fitted to the fixing ring and abuts against the flange of the fixing ring ;
A plurality of engaging pieces to be locked to the flange portion of the joint body are protruded with a predetermined distance in the stopper body, Ri Tona,
The flange of the fixing ring and the flange of the joint body are sandwiched from both sides,
A pipe joint structure that is a stopper.   The pipe joint structure according to claim 1, wherein the fixing ring has a mechanism that advances and retreats in a pipe axis direction of the joint main body with respect to a rotation operation of the fixing ring.   With respect to the rotation of the fixing ring, the mechanism in which the fixing ring advances and retreats in the pipe axis direction of the joint body is:
  An engagement groove formed on the outer peripheral surface of the joint body so as to be inclined with respect to a horizontal direction orthogonal to the tube axis direction;
  An engagement projection provided on the fixing ring and slidably engaged with the engagement groove;
With
  The joint structure of a tubular body according to claim 2, wherein the fixing ring is connected to the joint main body while engaging the engagement convex portion with the engagement groove.   The joint structure for a tubular body according to claim 3, wherein a convex portion over which the engaging convex portion of the fixing ring rides is provided at a terminal portion of the engaging groove.   The flange provided on the outer peripheral surface of the fixing ring and the flange provided on the outer peripheral surface of the connecting portion of the joint main body are arranged in a circumferential direction in a state where the fixing ring is engaged with the joint main body. A notch or hole is formed in the matching position,
  The locking piece is inserted through the notch or the hole formed in the flange provided on the outer peripheral surface of the fixing ring and the flange provided on the outer peripheral surface of the joint body, and the fixing ring The tubular joint according to any one of claims 1 to 4, wherein the tubular joint is engaged in a circumferential direction with a flange provided on the outer peripheral surface of the joint and a flange provided on the outer peripheral surface of the joint body. Construction. The tubular body according to any one of claims 1 to 5 , wherein an engagement portion that can be engaged with a flange portion of the joint body is formed on an inner peripheral surface of the locking piece of the stopper. Joint structure. The tubular body according to any one of claims 1 to 6 , wherein the fixing ring is provided with a mark for confirming from the outside whether or not the locking piece of the stopper is locked to the joint body. Joint structure.   An annular seal body in which the tubular body connected to the joint body is inserted and an annular concave portion is formed in the circumferential direction on the outer peripheral surface;
A first annular body inserted through the tubular body so as to be disposed on the joint body side of the seal body;
  A second annular body inserted through the tubular body so as to be disposed on the opposite side of the seal body from the joint body;
With
The tubular joint structure according to any one of claims 1 to 7, wherein the fixing ring is attached to the tubular body from the second annular body side. A pipe joint comprising the pipe joint structure according to any one of claims 1 to 8 . A joint structure for a tubular body according to any one of claims 1 to 8 ,
A main body provided with a joint structure of the tube,
Made with a, Masu.

Images