JP5731329B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint.

  Conventionally, a metal pipe joint provided with a flange portion is known (for example, Patent Document 1). Also known is a pipe joint in which a screw mounting hole is formed in the flange portion. In this type of pipe joint, for example, a screw is screwed into a flooring or the like through an attachment hole, and a flange portion is fixed to the flooring or the like by engaging a seat surface of the screw with an edge of the attachment hole.

JP 2010-65732 A

  By the way, it is conceivable to form the pipe joint with a resin from the viewpoint of weight reduction or the like. However, in general, a resin is more easily cracked than a metal. Therefore, if the pressing force acting on the edge of the mounting hole from the seat surface of the screw increases due to excessive screwing of the screw against the flooring, etc., the edge of the mounting hole may crack and the flange part may be damaged. There is.

  An object of the present invention is to provide a pipe joint capable of suppressing breakage of an edge of an attachment hole formed in a flange portion while reducing the weight in consideration of the above fact.

  The pipe joint according to claim 1 is a joint pipe main body part, a resin flange part provided in the joint pipe main body part, a screw formed on the flange part, and screwing the flange part to a mounting member. An attachment hole for penetrating the member and a protrusion provided integrally with the edge of the attachment hole and partially hitting the head of the screw member.

  According to the pipe joint according to the first aspect, when the screw member is screwed to the attachment member such as the flooring through the attachment hole, the head portion of the screw member hits the protruding portion. When the screw member is further screwed in this state, a frictional force (friction resistance) is generated between the head of the rotating screw member and the protrusion. Since the rotational speed of the screw member is reduced by this frictional force, excessive screwing of the screw member with respect to the mounting member is suppressed. Therefore, damage to the edge of the mounting hole is suppressed.

  Further, the collision energy between the head of the screw member and the edge of the mounting hole is absorbed by the frictional force between the head of the screw member and the protrusion. Therefore, damage to the edge of the mounting hole is suppressed.

  Thus, by providing a projection on the edge of the attachment hole, it is possible to reduce damage to the edge of the attachment hole while reducing the weight of the pipe joint.

  A pipe joint according to a second aspect is the pipe joint according to the first aspect, wherein the protrusion is provided in a counterbore part formed around the attachment hole.

  According to the pipe joint according to the second aspect, the appearance of the flange portion is improved by housing the head portion of the screw member in the counterbore portion formed around the mounting hole.

  According to a third aspect of the present invention, there is provided the pipe joint according to the first or second aspect, wherein the pipe joint is a crushing protrusion that is crushed when a pressing force of a predetermined value or more is applied from the head of the screw member.

  According to the pipe joint according to claim 3, the crushing protrusion is crushed when receiving a pressing force of a predetermined value or more from the head of the screw member, so that the collision energy of the head of the screw member against the edge of the mounting hole is reduced. Absorbed. Therefore, damage to the edge of the mounting hole is suppressed.

  A pipe joint according to a fourth aspect is the pipe joint according to any one of the first to third aspects, wherein the protrusion extends in the radial direction of the mounting hole.

  According to the pipe joint according to the fourth aspect, the protrusion and the head of the screw member are compared with the configuration in which the protrusion does not extend in the radial direction of the attachment hole by extending the protrusion in the radial direction of the attachment hole. Since the contact area with the part increases, the frictional force generated between the protrusion and the head of the screw member increases. Therefore, since the deceleration rate of the rotational speed of the screw member is increased, excessive screwing of the screw member with respect to the mounting member is further suppressed.

  A pipe joint according to a fifth aspect is the pipe joint according to the fourth aspect, wherein the plurality of protrusions are evenly arranged in the circumferential direction of the mounting hole.

  According to the pipe joint of the fifth aspect, when the screw member is inserted into the mounting hole, the head portion of the screw member hits the plurality of protrusions arranged uniformly in the circumferential direction of the mounting hole. Thereby, the inclination of the screw member is suppressed as compared with the case where the protrusion hits only one side of the head of the screw member. Therefore, it becomes easy to screw the screw member into the mounting member, so that workability is improved.

  A pipe joint according to a sixth aspect is the pipe joint according to any one of the first to third aspects, wherein the protruding portion extends in a circumferential direction of the mounting hole.

  According to the pipe joint according to the sixth aspect, the protrusion and the head of the screw member are compared with the configuration in which the protrusion does not extend in the circumferential direction of the attachment hole by extending the protrusion in the circumferential direction of the attachment hole. Since the contact area with the part increases, the frictional force generated between the protrusion and the head of the screw member increases. Therefore, since the deceleration rate of the rotational speed of the screw member is increased, excessive screwing of the screw member with respect to the mounting member is further suppressed.

  Further, when the screw member is inserted into the mounting hole, the head portion of the screw member hits a protrusion extending in the circumferential direction of the mounting hole. Thereby, the inclination of the screw member is suppressed as compared with the case where the protrusion hits only one side of the head of the screw member. Therefore, it becomes easy to screw the screw member into the mounting member, so that workability is improved.

  A pipe joint according to a seventh aspect is the pipe joint according to any one of the first to sixth aspects, wherein the width of the tip of the protrusion is narrower than the width of the base of the protrusion. It has become.

  According to the pipe joint according to the seventh aspect, the width of the tip portion of the projection portion is made narrower than the width of the base portion, so that the projection portion is easily crushed when the head portion of the screw member hits the projection portion. Become. Therefore, the absorption performance of the collision energy of the head of the screw member with respect to the edge of the mounting hole is improved.

  As described above, according to the pipe joint according to the present invention, it is possible to suppress damage to the edge of the mounting hole formed in the flange portion while reducing the weight.

It is a side view showing the state where the pipe joint concerning one embodiment of the present invention was fixed to the flooring. It is a top view showing the state where the pipe joint concerning one embodiment of the present invention was fixed to the flooring. (A) is an enlarged plan view corresponding to FIG. 2 showing a protrusion in one embodiment of the present invention, and (B) is a cross-sectional view taken along line 3B-3B of FIG. 3 (A). (A) is sectional drawing equivalent to FIG. 3 (B) which shows the state which the seating surface of the countersunk screw contacted the projection part in one Embodiment of this invention, (B) is the protrusion in one Embodiment of this invention It is sectional drawing equivalent to FIG. 3 (B) which shows the state which the part collapsed. It is sectional drawing equivalent to FIG. 3 (B) which shows the state which the bearing surface of the countersunk screw contacted the internal peripheral surface of the counterbore part in a comparative example. (A) is a perspective view which shows the modification of the projection part in one Embodiment of this invention, (B) is the 6B-6B sectional view taken on the line of FIG. 6 (A). (A) is a top view equivalent to FIG. 3 (A) which shows the modification of the projection part in one Embodiment of this invention, (B) is the 7B-7B sectional view taken on the line of FIG. 7 (A). (A) is a top view equivalent to FIG. 3 (A) which shows the modification of the projection part in one Embodiment of this invention, (B) is the 8B-8B sectional view taken on the line of FIG. 8 (A). (A) is a top view equivalent to FIG. 3 (A) which shows the modification of the projection part in one Embodiment of this invention, (B) is the 9B-9B sectional view taken on the line of FIG. 9 (A).

  Hereinafter, a pipe joint according to an embodiment of the present invention will be described with reference to the drawings. Note that an arrow R appropriately shown in each drawing indicates the radially outer side of the mounting hole, and an arrow G indicates the back side in the insertion direction of the countersunk screw as the screw member.

  FIG. 1 shows a pipe joint 10 according to an embodiment as an example. The pipe joint 10 is a floor-fixed joint that is fixed to an edge of a through hole 52 for piping formed in a wooden floor material 50, and is an upper water supply pipe as a pipe that is piped above the floor material 50. 60 and a lower water supply pipe 62 as a pipe piped below the flooring 50 are connected.

  As shown in FIG. 1, the pipe joint 10 includes a joint pipe main body part 12, a flange part 14, and a water / hot water pipe connection part 16. The joint pipe main body portion 12 is made of a resin and is formed in a cylindrical shape, and is inserted into the through hole 52 of the flooring 50 with the axial direction being the vertical direction. A female thread portion 18 serving as a first pipe connecting portion to which the upper water supply pipe 60 is connected is provided at one axial end portion (upper end portion) of the joint pipe main body portion 12. By screwing a male screw portion (not shown) provided at the lower end portion 60 </ b> A of the upper water supply pipe 60 into the female screw portion 18, the upper water supply pipe 60 is connected to the joint pipe main body portion 12 in a watertight manner.

A flange portion 14 is provided at one axial end portion of the joint pipe main body portion 12. The flange portion 14 is made of resin and formed integrally with the joint pipe main body portion 12, and projects outward from the outer peripheral surface of the joint pipe main body portion 12 in the radial direction. The flange portion 14 is formed in a circular shape (see FIG. 2) as viewed in the axial direction of the joint tube body portion 12 (thickness direction of the flange portion 14), it is formed on the outer diameter D ₁ floor member 50 It is larger than the diameter D ₂ of the through hole 52. Thereby, when the joint pipe main-body part 12 is inserted in the through-hole 52 of the flooring 50, the outer peripheral part of the flange part 14 is hooked on the edge of the through-hole 52. FIG.

  A mounting hole 30 for penetrating the screw member is formed in the outer peripheral portion of the flange portion 14. The mounting hole 30 is a circular hole that penetrates the flange portion 14 in the plate thickness direction, and a countersunk screw 70 as a screw member can be passed therethrough. As shown in FIG. 2, a plurality of attachment holes 30 (three in the present embodiment) are formed at predetermined intervals in the circumferential direction of the flange portion 14. By inserting the countersunk screws 70 into the mounting holes 30 from the upper surface 14A side of the flange part 14 and screwing the countersunk screws 70 into the flooring 50, the flanges 14 are screwed (fixed) to the flooring 50. Yes.

  On the other hand, as shown in FIG. 1, the other axial end portion (lower end portion) of the joint pipe main body portion 12 has an outer diameter smaller than that of the one axial end portion of the joint pipe main body portion 12, and the flange portion 14. Is fixed to the floor material 50 so as to extend downward from the floor material 50. At the other axial end of the joint pipe main body part 12, a pipe insertion part 20 is provided as a second pipe connection part to which the lower water supply pipe 62 is connected. By inserting the pipe insertion part 20 into the upper end part 62A of the lower water supply pipe 62, the lower water supply pipe 62 is connected to the joint pipe main body part 12 in a watertight manner. Further, a water supply / hot water supply pipe connection part 16 is attached to the pipe insertion part 20. The water supply / hot water supply pipe connection portion 16 is made of resin and formed in a cylindrical shape, and an upper end portion 62A of the lower water supply pipe 62 is inserted therein. Further, a lock mechanism (not shown) is provided inside the water / hot water supply pipe connection portion 16, and the upper end portion 62 </ b> A of the lower water supply pipe 62 is prevented from coming out of the pipe insertion portion 20 by this lock mechanism.

  Here, the configuration of the mounting hole 30 formed in the flange portion 14 will be described in detail.

  As shown in FIGS. 3A and 3B, a counterbore portion 32 that houses the head 72 of the countersunk screw 70 is formed on the edge on the upper surface 14 </ b> A side of the flange portion 14 in the mounting hole 30. Yes. The counterbore part 32 has a truncated cone shape (tapered shape) that gradually decreases in diameter from the front side in the insertion direction of the countersunk screw 70 toward the back side in the insertion direction according to the taper shape of the seating surface 72A of the head 72 of the countersunk screw 70. Shape) holes.

  When the countersunk screw 70 is inserted into the mounting hole 30, the inner peripheral surface 32 </ b> A of the counterbore part 32 faces the seating surface 72 </ b> A of the head 72 of the countersunk screw 70. As shown in FIG. 3 (B), the inner peripheral surface 32A of the counterbore part 32 is in a cross-sectional view along the insertion direction of the countersunk screw 70, according to the inclination angle of the seating surface 72A of the countersunk screw 70. The countersunk screw 70 is inclined from the front side in the insertion direction to the back side in the insertion direction (arrow G direction) and radially inward of the mounting hole 30 (in the direction opposite to the arrow R direction).

  A plurality (four in this embodiment) of protrusions 40 are provided on the inner peripheral surface 32 </ b> A of the counterbore part 32. These protrusions 40 protrude from the inner peripheral surface 32 </ b> A of the counterbore part 32 and have substantially the same height (projection amount). Thereby, when the countersunk screws 70 are inserted into the mounting holes 30, the protrusions 40 come into contact with the seating surface 72 </ b> A of the countersunk screws 70 substantially simultaneously. The protrusions 40 are arranged substantially evenly in the circumferential direction of the mounting hole 30 when viewed from the front side in the insertion direction of the countersunk screw 70, and radiate from the mounting hole 30 along the inner peripheral surface 32 </ b> A of the counterbore part 32. It extends. Thereby, when the seating surface 72A of the countersunk screw 70 comes into contact with each projection 40, the inclination of the countersunk screw 70 is suppressed. Furthermore, the height and width of each protrusion 40 is set so that it will be crushed when it receives a pressing force of a predetermined value or more from the seat surface 72A of the countersunk screw 70 toward the back side of the countersunk screw 70 in the insertion direction. It is a crushing protrusion. Furthermore, the width of the tip of the protrusion 40 is narrower than the width of the base of the protrusion 40. Thereby, the front-end | tip part of the projection part 40 becomes easy to be crushed.

  Next, the effect | action of the pipe joint which concerns on this embodiment is demonstrated, contrasting with a comparative example.

  As shown in FIG. 4 (A), the pipe joint 10 according to this embodiment is configured by screwing the countersunk screws 70 into the flooring 50 through the mounting holes 30 formed in the resin flange portion 14. By engaging the seating surface 72 </ b> A of the head 72 with the protrusion 40 provided on the inner peripheral surface 32 </ b> A of the counterbore portion 32, the flange portion 14 is screwed to the flooring 50.

At this time, as in the comparative example shown in FIG. 5, the head 72 of the countersunk screw 70 is engaged with the counterbore 32 in the configuration in which the protrusion 40 is not provided on the inner peripheral surface 32 </ b> A of the counterbore 32. At this time, a pressing force F ₀ is applied from the seat surface 72A of the countersunk screw 70 to the inner peripheral surface 32A of the counterbore part 32 toward the back side in the insertion direction of the countersunk screw 70. If this pressing force F ₀ increases due to excessive screwing of the countersunk screw 70 with respect to the floor material 50, cracks or the like may occur in the counterbore part 32. In particular, in a configuration in which the inner peripheral surface 32A of the counterbore part 32 is inclined, a component force F ₁ (see FIG. 5) acting outward in the radial direction of the mounting hole 30 acts on the inner peripheral surface 32A. That is, the component force F _{1 in the} direction of expanding the counterbore part 32 acts on the inner peripheral surface 32 A of the counterbore part 32. Therefore, cracks are likely to occur in the counterbore part 32.

  Further, when the countersunk screw 70 is screwed into the flooring 50 using an electric screwdriver or the like, the screwing speed of the countersunk screw 70 relative to the flooring 50 (the counterbore portion) is compared with the case where the operator manually turns the screwdriver or the like. 32), the seating surface 72A of the countersunk screw 70 may collide with the inner peripheral surface 32A of the counterbore part 32. In general, the resin is often weak against such a collision load. In particular, a high-strength resin reinforced with glass fiber is brittle and easily cracked. Therefore, when the seat surface 72A of the countersunk screw 70 collides with the inner peripheral surface 32A of the counterbore part 32, a crack or the like is more likely to occur in the counterbore part 32.

On the other hand, in the pipe joint 10 according to the present embodiment, as shown in FIG. 4A, a plurality of protrusions 40 are provided on the inner peripheral surface 32 </ b> A of the counterbore part 32. These protrusions 40 protrude from the inner peripheral surface 32 </ b> A of the counterbore part 32. Therefore, when the countersunk screw 70 is screwed into the flooring 50 through the mounting hole 30, the seating surface 72 </ b> A of the countersunk screw 70 comes into contact with the protrusion 40 before the inner peripheral surface 32 </ b> A of the counterbore part 32. When the countersunk screw 70 is further screwed in this state, a frictional force (friction resistance) is generated between the seating surface 72A of the rotating countersunk screw 70 and the protrusion 40. Due to this frictional force, the rotational speed of the countersunk screw 70 is reduced, and the screwing speed of the countersunk screw 70 with respect to the flooring 50 is reduced. Therefore, since excessive twisting with respect to the flooring 50 is suppressed, the pressing force F ₀ (see FIG. 5A) acting on the inner peripheral surface 32A of the counterbore portion 32 is reduced.

Further, the collision energy of the head 72 of the countersunk screw 70 against the counterbore part 32 is absorbed by the frictional force between the seating surface 72 </ b> A of the countersunk screw 70 and the protrusion 40. Furthermore, in this embodiment, when the pressing force F ₀ (see FIG. 5) acting on the protrusion 40 from the seating surface 72A of the countersunk screw 70 becomes a predetermined value or more, the protrusion 40 is shown in FIG. 4B. Collapses. Thereby, the collision energy of the head 72 of the countersunk screw 70 against the counterbore part 32 is further absorbed.

  Thus, in the pipe joint 10 according to the present embodiment, by providing the protrusion 40 on the inner peripheral surface 32A of the counterbore part 32, excessive twisting of the countersunk screw 70 with respect to the flooring 50 is suppressed, and the counterbore The collision energy of the head 72 of the countersunk screw 70 against the portion 32 is reduced. Therefore, the crack etc. which generate | occur | produce in the counterbore part 32 can be suppressed, reducing the weight of the pipe joint 10. FIG.

  Furthermore, in the present embodiment, the protrusion 40 is extended in the radial direction of the mounting hole 30 along the inner peripheral surface 32 </ b> A of the counterbore 32, so that the contact area between the protrusion 40 and the seat surface 72 </ b> A of the countersunk screw 70 is increased. growing. Thereby, the frictional force generated between the protrusion 40 and the seat surface 72A of the countersunk screw 70 increases. Therefore, the rate of reduction of the rotational speed of the countersunk screw 70 is increased, and the impact energy absorbing performance of the head 72 of the countersunk screw 70 against the counterbore part 32 is improved.

  In addition, the protrusions 40 have substantially the same height (projection amount) and are disposed substantially evenly in the circumferential direction of the mounting hole 30. As a result, the seat surface 72A of the countersunk screw 70 comes into contact with the protrusions 40 substantially simultaneously. Further, the head 72 of the countersunk screw 70 is supported by the protrusions 40 along the radial direction of the seating surface 72A. Therefore, the inclination of the countersunk screw 70 is suppressed as compared with the configuration in which the protrusion 40 contacts only one side of the head 72 of the countersunk screw 70. Therefore, the countersunk screw 70 can be easily screwed into the flooring 50, so that workability is improved.

  Further, for example, the operator can easily recognize the screwing amount of the countersunk screw 70 with respect to the flooring material 50 by a contact sound or the like generated when the seating surface 72A of the countersunk screw 70 contacts the protrusion 40. By adjusting the amount of screwing of the countersunk screw 70 with respect to the flooring material 50 by this contact sound or the like, it is possible to suppress excessive twisting of the countersunk screw 70 with respect to the flooring material 50 while improving workability. it can. It should be noted that the rotational load of the countersunk screw 70 due to the frictional resistance between the seating surface 72A of the countersunk screw 70 and the protruding part 40, or the breaking sound generated when the protruding part 40 is crushed or the operator through a tool such as a screwdriver. The operator can also recognize the screwing amount of the countersunk screw 70 with respect to the floor material 50 also by the impact transmitted.

  Furthermore, in this embodiment, the counterbore part 32 is formed in the edge of the attachment hole 30, and the head 72 of the countersunk screw 70 can be accommodated in the counterbore part 32, so that the appearance of the flange part 14 is improved.

  Next, a modification of the pipe joint according to the above embodiment will be described.

  In the said embodiment, although the height of the some projection part 40 was made substantially the same, the height of the some projection part 40 may differ. Moreover, although the some protrusion part 40 was formed in 32 A of internal peripheral surfaces of the counterbore part 32, at least one protrusion part 40 should just be sufficient and the number and arrangement | positioning can be changed suitably.

  Furthermore, the shape of the protrusion 40 can be changed as appropriate. For example, in the modification shown in FIGS. 6A and 6B, a plurality (three in this modification) of the protrusions 42 are provided in the mounting holes when viewed from the front side of the countersunk screw 70 in the insertion direction. 30 are arranged substantially evenly in the circumferential direction. As shown in FIG. 6 (B), each projection 42 has a top 42A in the cross-sectional view along the insertion direction of the countersunk screw 70, and the front side in the insertion direction of the countersunk screw 70 (the direction opposite to the arrow G direction). ). The protrusion 40 has an upper end surface 42 </ b> B substantially flush with the upper surface 14 </ b> A of the flange portion 14, and a side end face 42 </ b> C substantially flush with the inner peripheral surface of the mounting hole 30.

  In this way, the protrusion 42 can be easily crushed by turning the top 42A of the protrusion 42 toward the front side in the insertion direction of the countersunk screw 70 and bringing the seating surface 72A of the countersunk screw 70 into contact with the top 42A first. It is.

  Further, in the modification shown in FIGS. 7A and 7B, the protrusions 44 are formed in an annular shape along the circumferential direction of the mounting hole 30, and are spaced apart in the radial direction of the mounting hole 30. A plurality of (two in this modification) are formed. Each protrusion 44 has substantially the same height (projection amount), and as shown in FIG. 7B, the top 44 </ b> A is formed as a dish in a sectional view along the insertion direction of the countersunk screw 70. The screw 70 is formed in a substantially triangular shape toward the front side in the insertion direction.

  By forming the projection 44 in an annular shape along the circumferential direction of the mounting hole 30 in this manner, the contact area between the projection 40 and the seating surface 72A of the countersunk screw 70 is increased. The frictional force generated between the seating surface 72A and the seating surface 72A increases. Therefore, the rate of reduction of the rotational speed of the countersunk screw 70 is increased, and the energy absorption performance of the head 72 of the countersunk screw 70 with respect to the counterbore part 32 is improved.

  In addition, the seat surface 72A of the countersunk screw 70 contacts the protrusions 44 substantially simultaneously. Further, the head 72 of the countersunk screw 70 is supported by the protrusions 44 along the circumferential direction of the seating surface 72A. Thereby, the inclination of the countersunk screw 70 is suppressed compared with the structure where a projection part contacts only one side of the seating surface 72A of the countersunk screw 70. Accordingly, the countersunk screw 70 is easily screwed into the floor material 50, so that workability is improved.

  The protrusion 44 is not limited to an annular shape, and a plurality of protrusions extending in the circumferential direction of the mounting hole 30 may be formed at intervals in the circumferential direction.

  Further, in the modification shown in FIGS. 8A and 8B, the protrusions 46 are formed in a hemispherical shape (dome shape), and a plurality of protrusions 46 are spaced apart in the circumferential direction of the mounting hole 30. (Four in this modification) are formed. As described above, the shape of the protrusion can be changed as appropriate.

  Next, in the said embodiment, although 32 A of internal peripheral surfaces of the counterbore part 32 were inclined, it is not restricted to this. For example, when using a screw whose head seat surface is not inclined (for example, a screw 80 shown in FIG. 9B), the counterbore 32 may be a cylindrical hole.

  Moreover, the counterbore part 32 can also be abbreviate | omitted like the modification shown by FIG. 9 (A) and FIG. 9 (B). In this configuration, when the screw 80 is inserted into the mounting hole 30, the seat surface 82 </ b> A of the head 82 of the screw 80 is opposed to the edge 14 </ b> A <b> 1 on the upper surface 14 </ b> A side of the flange portion 14 in the mounting hole 30. The screw 80 is a pan screw whose seating surface 82A is not tapered (inclined).

  A plurality of protrusions 48 are provided on the edge 14 </ b> A <b> 1 of the mounting hole 30. The protrusions 48 extend in the circumferential direction of the mounting hole 30 and are formed in a plurality (four in this modification) at intervals in the circumferential direction of the mounting hole 30. As shown in FIG. 9B, each protrusion 48 is formed in a substantially triangular shape in a cross-sectional view along the insertion direction of the screw 80, and its upper surface 48 </ b> A is outward in the radial direction of the mounting hole 30. It inclines toward the back in the insertion direction of the screw 80.

  Thus, by providing the protrusion 48 on the edge 14A1 of the mounting hole 30, the same effect as in the above embodiment can be obtained.

  Further, in the above embodiment, the flange portion 14 is formed in a circular shape (see FIG. 2) when viewed from the plate thickness direction, but the shape of the flange portion 14 may be elliptical when the flange portion 14 is viewed from the plate thickness direction. Further, it may be a polygon such as a triangle or a rectangle.

  Moreover, in the said embodiment, although the joint pipe main-body part 12 was formed with resin, you may form the joint pipe main-body part 12 with a metal. Moreover, the shape of the joint pipe main-body part 12 is not restricted to what was mentioned above, For example, you may make it bend in L shape. Moreover, although the internal thread part 18 and the pipe insertion part 20 were provided in the joint pipe main-body part 12 as an example of a 1st pipe connection part and a 2nd pipe connection part, a 1st pipe connection part and a 2nd pipe connection part are provided. Various known connection structures can be applied. Furthermore, it is good also as a branch joint which provides a joint pipe main-body part with three or more pipe connection parts, and branches a flow path.

  Furthermore, in the above embodiment, the case where the flange portion 14 is fixed to the wooden floor 50 has been described as an example. However, for example, the flange portion may be fixed to a concrete floor (slab), a wall, a column, or the like. Alternatively, the flange portion may be fixed to an attachment member such as a cross member passed between the columns. In this case, the flange portion may be provided in the joint pipe main body according to the shape of the mounting member. For example, a flat flange portion is provided on the outer peripheral surface of the joint pipe main body so as to face the outer peripheral surface. May be.

  Furthermore, in the above embodiment, the countersunk screw 70 is used as the screw member, but a truss screw, a tapping screw, a drill screw, or the like can be used. Further, the flange portion 14 may be abutted against an attachment member such as a connecting flange provided at the end of the pipe and fixed with a bolt and a nut. In this case, a bolt as a screw member is passed through the mounting hole 30 formed in the flange portion 14, and the head of the bolt is engaged with the edge of the mounting hole 30. Therefore, by providing a protrusion on the edge of the mounting hole 30, excessive tightening of the bolt is suppressed, so that cracks and the like of the edge of the mounting hole 30 are suppressed.

  As mentioned above, although one embodiment of the present invention was described, the present invention is not limited to such an embodiment, and one embodiment and various modifications may be used in combination as appropriate, and the gist of the present invention will be described. Of course, various embodiments can be implemented without departing from the scope.

DESCRIPTION OF SYMBOLS 10 Pipe joint 12 Joint pipe main-body part 14 Flange part 14A1 Attachment hole edge 30 Attachment hole 32 Counterbore part 40 Projection part 42 Projection part 44 Projection part 46 Projection part 48 Projection part 70 Countersunk screw (screw member)
80 screws (screw members)

Claims (7)

A joint pipe body,
A resin flange provided in the joint pipe body, and
An attachment hole for passing through a screw member that is formed in the flange portion and screwed the flange portion to the attachment member;
A protrusion that is integrally provided on the edge of the mounting hole, and that partially hits the head of the screw member;
A pipe fitting comprising:   The pipe joint according to claim 1, wherein the protrusion is provided on a counterbore formed around the attachment hole.   The pipe joint according to claim 1 or 2, wherein the protrusion is a crushing protrusion that is crushed when a pressing force of a predetermined value or more is received from the head of the screw member.   The pipe joint according to any one of claims 1 to 3, wherein the protrusion extends in a radial direction of the mounting hole.   The pipe joint according to claim 4, wherein the plurality of protrusions are arranged uniformly in the circumferential direction of the mounting hole.   The pipe joint according to any one of claims 1 to 3, wherein the protrusion extends in a circumferential direction of the mounting hole.   The pipe joint according to any one of claims 1 to 6, wherein a width of a distal end portion of the protruding portion is narrower than a width of a base portion of the protruding portion.

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