WO2013031859A1

WO2013031859A1 - Pipe joint

Info

Publication number: WO2013031859A1
Application number: PCT/JP2012/071890
Authority: WO
Inventors: 建郎飯塚
Original assignee: 株式会社ブリヂストン
Priority date: 2011-08-31
Filing date: 2012-08-29
Publication date: 2013-03-07
Also published as: JP2013050196A; JP5674599B2; CN103732967B; CN103732967A

Abstract

A pipe joint (10) is provided with: a joint body (12); a resin flange (14) extended from the joint body (12) toward the outer side in the radial direction; an attachment hole (30) formed in the flange (14) allowing passage of a screw member for screwing the flange (14) to an attachment member; a primary slit-shaped part (36) formed on the flange (14), extending from the attachment hole (30) to the outer edge of the flange (14); and secondary slit-shaped parts (44, 46) formed on the flange (14), extending from the attachment hole (30) but not reaching the outer edge of the flange (14).

Description

Pipe fitting

The present invention relates to a pipe joint.

2. Description of the Related Art Conventionally, a metal pipe joint including a cylinder body in which a screw hole to which a pipe or the like is connected is formed and a flange portion provided in the cylinder body is known (for example, JP 2010-65732 A). Publication). 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, the countersunk screw is screwed into the flooring or the like through the mounting hole, and the flange is fixed to the flooring or the like by engaging the seating surface of the countersunk screw with the edge of the mounting hole.

By the way, it is conceivable that the pipe joint is formed of 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 countersunk screw seat surface increases due to excessive screwing of the countersunk screw against the flooring or the like, the edge of the mounting hole is caused by the tapered countersunk screw seating surface. There is a possibility that cracks or the like may occur at the edge of the mounting hole.

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

The pipe joint according to the first aspect of the present invention includes a joint pipe main body portion, a resin flange portion projecting radially outward from the joint pipe main body portion, the flange portion, and the flange portion being attached thereto. A screw member penetrating attachment hole to be screwed to the member, a main slit-like portion formed in the flange portion and extending from the attachment hole to an outer edge portion of the flange portion, formed in the flange portion, and from the attachment hole And a sub-slit-shaped portion that extends and does not reach the outer edge portion of the flange portion.

According to the first aspect, for example, by screwing a screw member into an attachment member such as a flooring through an attachment hole formed in the flange portion, by engaging the head of the screw member with the edge of the attachment hole, The flange portion is screwed (fixed) to the mounting member.

Here, the flange portion is formed with a main slit-like portion extending from the attachment hole to the outer edge portion of the flange portion, and a sub-slit-like portion extending from the attachment hole and not reaching the outer edge portion of the flange portion. Thereby, for example, when the attachment hole is pushed and widened by the head portion of the screw member, the main slit-shaped portion and the sub-slit-shaped portion are opened. Therefore, since the stress generated at the edge of the mounting hole is reduced, damage to the edge of the mounting hole is suppressed.

Thus, by forming the main slit-shaped portion and the sub-slit-shaped portion in the flange portion, it is possible to suppress damage to the edge of the mounting hole while reducing the weight of the pipe joint.

The pipe joint according to the second aspect of the present invention is the pipe joint according to the first aspect, wherein the sub slit-like portion extends from the mounting hole to the outside of the joint pipe main body portion.

According to the second aspect, since the sub slit-like portion extends from the attachment hole to the outside of the joint pipe main body portion, even if a crack occurs in the flange portion along the sub slit-like portion, the crack is generated in the joint pipe main body. It becomes difficult to reach the department. Therefore, since the breakage of the joint pipe main body portion is suppressed, leakage of liquid and gas from the joint pipe main body portion is suppressed.

The pipe joint according to a third aspect of the present invention is the pipe joint according to the first aspect or the second aspect, wherein the main slit-like part and the sub-slit-like part have the flange part in the plate thickness direction. It is a slit that penetrates through.

According to the third aspect, the main slit-shaped portion and the sub-slit-shaped portion are more easily opened by using the main slit-shaped portion and the sub-slit-shaped portion as slits. Therefore, since the stress generated at the edge of the mounting hole is further reduced, damage to the edge of the mounting hole is suppressed.

The pipe joint according to a fourth aspect of the present invention is the pipe joint according to any one of the first to third aspects, wherein the main slit-shaped portion sandwiches the attachment hole. The sub slit portion is formed on the opposite side of the tube main body portion, and extends symmetrically with respect to the main slit portion.

According to the fourth aspect, when the edge of the mounting hole is pushed and widened by the head of the screw member, the main slit-shaped portion and the sub slit-shaped portion extending symmetrically with respect to the main slit-shaped portion are opened. Therefore, since the stress generated at the edge of the mounting hole is further reduced, damage to the edge of the mounting hole is suppressed.

A pipe joint according to a fifth aspect of the present invention is the pipe joint according to the fourth aspect, wherein the flange portion has a circular shape concentric with the joint pipe main body when viewed from the axial direction of the joint pipe main body. The main slit-shaped portion is formed along the radial direction of the flange portion, and the sub-slit-shaped portion extends in a direction orthogonal to the main slit-shaped portion.

According to the fifth aspect, the main slit-shaped portion extends in the radial direction of the flange portion, so that the main slit-shaped portion extends in the direction inclined with respect to the radial direction of the flange portion. The length of the slit-like part is shortened. Therefore, the strength reduction of the flange portion due to the main slit-like portion can be minimized.

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 main slit-like portion and a sub-slit-like portion in one embodiment of the present invention, and (B) is a sectional view taken along line 3B-3B in FIG. 3 (A). is there. It is an enlarged plan view of Drawing 3 (A) showing the state where the main slit-like part in one embodiment of the present invention opened. It is sectional drawing equivalent to FIG. 3 (B) which shows the state which the bearing surface of the countersunk screw contacted with the internal peripheral surface of the counterbore part in a comparative example. It is a top view equivalent to Drawing 3 (A) showing a modification of a sub slit shape part in one embodiment of the present invention. It is sectional drawing orthogonal to the longitudinal direction of the main slit-shaped part which shows the modification of the main slit-shaped part in one Embodiment of this invention.

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 the edge of a through hole 52 for piping formed in a wooden floor material 50, and is an upper drain pipe as a pipe that is piped above the floor material 50. 60 and a lower drain 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 pipe cover 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 connecting hole 18 as a first pipe connecting portion to which the upper drain pipe 60 is connected is formed at one end portion (upper end portion) in the axial direction of the joint pipe main body portion 12. The inner peripheral surface of the connection hole 18 is a female screw part in which a female screw is cut, and a male screw part (not shown) provided at the lower end 60A of the upper drain pipe 60 is screwed into the connection hole 18. The upper drain pipe 60 is connected to the joint pipe main body 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) concentric with the connection hole 18 when viewed from the axial direction of the joint pipe main body portion 12 (the plate thickness direction of the flange portion 14). Further, the outer diameter D ₁ of the flange portion 14 is larger than the diameter D ₂ of the through hole 52 formed in the flooring 50. 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 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. The flange part 14 is fixed to the flooring 50 by inserting the countersunk screw 70 into the mounting holes 30 from the upper surface 14 A side of the flange part 14 and screwing the countersunk screw 70 into the flooring 50. Further, the flange portion 14 is formed with a main slit-shaped portion 36 and two sub-slit-shaped

portions

40 and 44 which will be described later.

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 end in the axial direction 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 drain pipe 62 is connected. By inserting the pipe insertion portion 20 into the upper end portion 62A of the lower drainage pipe 62, the lower drainage pipe 62 is connected to the joint pipe main body 12 in a watertight manner. In addition, a pipe cover portion 16 is attached to the pipe insertion portion 20. The pipe cover portion 16 is made of resin and formed in a cylindrical shape, and the upper end portion 62A of the lower drain pipe 62 is inserted therein. Further, a lock mechanism (not shown) is provided inside the pipe cover portion 16, and the upper end portion 62 A of the lower drain 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, the main slit-shaped portion 36, and the two sub-slit-shaped

portions

40, 44 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 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.

The inner peripheral surface 32 A of the counterbore part 32 is engaged with the seat surface 72 A of the head 72 of the countersunk screw 70 when the countersunk screw 70 is inserted into the mounting hole 30. 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).

Further, as shown in FIG. 3A, the counterbore part 32 includes a main body 32U and two first slits by a main slit-like part 36 and two sub-slit-

like parts

40, 44 provided in the flange part 14. It is divided (partitioned) into a moving unit 32M1 and a second moving unit 32M2. The main slit-shaped portion 36 is a slit that penetrates the flange portion 14 in the plate thickness direction, and is formed on the opposite side of the connection hole 18 with the attachment hole 30 interposed therebetween. The main slit 36 extends from the mounting hole 30 to the outer edge 14E of the flange 14 and is linear along the radial direction of the flange 14 so that its length (length in the longitudinal direction) is the shortest. Is formed. Thereby, the strength reduction of the flange part 14 by the main slit-shaped part 36 is suppressed to the minimum.

Two sub slit

portions

40 and 44 are formed on the connection hole 18 side of the flange portion 14 with respect to the main slit portion 36. These sub slit-

like portions

40 and 44 are slits that penetrate the flange portion 14 in the plate thickness direction. Moreover, two sub-slit-shaped

portion

40, 44 facing the direction of and the mounting hole 30 connecting hole 18 (the direction of arrow K), i.e., the center axis _{C 1} of the central axis _{C 2} and the connecting holes 18 of the mounting hole 30 Are formed on the opposite side of the straight line connecting the two. Further, the sub slit-

like portions

40 and 44 extend symmetrically with respect to the main slit-like portion 36 from the attachment hole 30 and extend to the outside of the connection hole 18 (joint pipe main body portion 12).

The sub slit-like portion 40 extends linearly to one side (right side in FIG. 3A) in a direction substantially orthogonal to the main slit-like portion 36, and in the counterbore portion 32 between the main slit-like portion 36. The first moving unit 32M1 is divided (divided). Further, the sub slit portion 40 divides (partitions) the counterbore main body portion 32 U on the connection hole 18 side in the counterbore portion 32 with the sub slit portion 44. With this sub-slit-like portion 40, the first moving portion 32M1 moves (rotates) radially outward of the mounting hole 30 with respect to the counterbore main body portion 32U, with the tip 40T of the sub-slit-like portion 40 as a fulcrum (rotating shaft). It is possible.

On the other hand, the sub-slit portion 44 extends linearly to the other side (left side in FIG. 3A) in the direction substantially orthogonal to the main slit-shape portion 36, and the counterbore portion is between the main slit-shape portion 36. The second moving unit 32M2 at 32 is divided (partitioned). The sub slit-like portion 44 allows the second moving portion 32M2 to rotate outwardly in the radial direction of the mounting hole 30 with respect to the counterbore main body portion 32U with the tip end portion 44T of the sub-slit-like portion 44 as a fulcrum (rotating shaft). ing.

Note that the sub slit-

like portions

40, 44 referred to here extend from the attachment hole 30 to the outside of the connection hole 18 (joint pipe main body portion 12), so that the sub slit-

like portions

40, 44 extend from the attachment hole 30 to the connection hole 18. It means extending in a direction where there is no (joint pipe main body portion 12). That is, the sub slit-

like portions

40 and 44 are formed in the flange portion 14 so that the connection hole 18 (joint pipe main body portion 12) does not exist on the extension line of the sub slit-

like portions

40 and 44.

Next, the operation of the pipe joint according to the present embodiment will be described in comparison with the comparative example.

As shown in FIGS. 3 (A) and 3 (B), the pipe joint 10 according to the present embodiment twists the countersunk screw 70 onto the flooring 50 through the mounting hole 30 formed in the resin flange 14. The flange portion 14 is screwed (fixed) to the flooring 50 by engaging the seating surface 72A of the head 72 of the countersunk screw 70 with the inner peripheral surface 32A of the counterbore portion 32.

At this time, as in the comparative example shown in FIG. 5, when the head 72 of the countersunk screw 70 is engaged with the counterbore part 32, the countersink 70 moves from the seat surface 72 A to the inner peripheral surface 32 A of the counterbore part 32. pressing force F ₀ toward the insertion direction rear side of the screw 70 acts. Further, when the inner peripheral surface 32 A of the counterbore part 32 is inclined, a component force F ₁ directed outward in the radial direction of the attachment hole 30 acts on the inner peripheral surface 32 A. 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. Accordingly, the component force F ₁ such as by narrowing excessive screw countersunk screw 70 with respect to the floor material 50 is increased, a crack or the like occurs in the counterbore portion 32, the flange portion 14 may be damaged. Further, when the crack reaches the connection hole 18, drainage or the like may leak from the connection hole 18.

In particular, 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 with respect to the flooring 50 (the counterbore part) is compared with the case where the operator manually turns the screwdriver or the like. (The approach speed of the head 72 of the countersunk screw 70 with respect to the inner peripheral surface 32A of 32) increases, and the head 72 of the countersunk screw 70 may collide with the inner peripheral surface 32A of the counterbore part 32. In general, many resins are weak against such a collision load. In particular, a high-strength resin reinforced with glass fibers is brittle with respect to the above-described collision load and easily breaks. Therefore, when the head 72 of the countersunk screw 70 collides with the inner peripheral surface 32 A of the counterbore part 32 as described above, a crack or the like is likely to occur in the counterbore part 32.

On the other hand, in the pipe joint 10 according to this embodiment, as shown in FIG. 4, the main slit-shaped portion 36 and the sub-slit-shaped

portions

40 and 44 are formed in the flange portion 14. Accordingly, when the component force F ₁ (see FIG. 5) acting on the inner peripheral surface 32A of the counterbore portion 32 becomes a predetermined value or more due to excessive screwing of the countersunk screw 70 with respect to the flooring 50, the following occurs. That is, as indicated by a two-dot chain line, the main slit-like portion 36 and the sub-slit-like portion 40 are opened, and the first moving portion 32M1 in the counterbore portion 32 is attached to the attachment hole with the tip portion 40T of the sub-slit-like portion 40 as a fulcrum. 30 moves radially outward (arrow P direction). Similarly, as indicated by a two-dot chain line, the main slit-shaped portion 36 and the sub-slit-shaped portion 44 are opened, and the second moving portion 32M2 in the counterbore portion 32 is a fulcrum on the tip portion 44T of the sub-slit-shaped portion 44. As shown in FIG. Thus, the component force F ₁ acting on the inner peripheral surface 32A of the countersunk portion 32 is reduced, the collision energy of the head 72 of the countersunk screw 70 against the counterbore portion 32 is absorbed. Therefore, the crack etc. which generate | occur | produce in the counterbore part 32 are suppressed.

As described above, in the pipe joint 10 according to the present embodiment, the main slit-shaped portion 36 and the sub-slit-shaped

portions

40 and 44 are formed in the flange portion 14, whereby the component force F acting on the inner peripheral surface 32 A of the counterbore portion 32. ₁ is reduced, and the collision energy of the head 72 of the countersunk screw 70 against the counterbore part 32 is absorbed. Therefore, the crack etc. which generate | occur | produce in the counterbore part 32 are suppressed.

Also, the first moving part 32M1 and the second moving part 32M2 move to the outside in the radial direction of the mounting hole 30 with respect to the counterbore main body part 32U. Therefore, for example, even if the movement amount (rotation amount) of the first moving portion 32M1 in the arrow P direction is excessive, a crack is generated from the tip portion 40T of the sub slit-like portion 40 toward the outer edge portion 14E of the flange portion 14. To do. Therefore, breakage of the connection hole 18 is suppressed.

Further, the sub slit-

like portions

40 and 44 extend from the attachment hole 30 to the outside of the connection hole 18. In other words, the connection hole 18 does not exist on the extension line of the sub slit-

like portions

40 and 44. Therefore, even if a crack occurs in the flange portion 14 along the sub slit-

like portions

40 and 44, the crack does not reach the connection hole 18. Therefore, breakage of the connection hole 18 is suppressed.

Furthermore, in this embodiment, the counterbore part 32 is formed at the edge of the mounting hole 30, and the head 72 of the countersunk screw 70 can be stored in the counterbore part 32, thereby improving the appearance of the flange part 14.

In addition, in the said embodiment, although the two sub slit shaped

parts

40 and 44 were formed in the flange part 14, you may abbreviate | omit either of the sub slit shaped

parts

40 and 44. FIG. In this case, for example, as in the modification shown in FIG. 6, the auxiliary slit-shaped portion is located on the screwing direction (arrow J direction) side of the upper drain pipe 60 with respect to the facing direction of the mounting hole 30 and the connection hole 18. It is desirable to form 40. When the upper drainage pipe 60 is screwed into the connection hole 18 and the flange portion 14 rotates integrally with the upper drainage pipe 60 (in the direction of the arrow L), a sub slit is formed with respect to the facing direction of the mounting hole 30 and the connection hole 18. This is because the edge of the mounting hole 30 on the side opposite to the shape portion 40 may collide with the countersunk screw 70 and the edge may be damaged. Therefore, when omitting one of the two

sub-slit portions

40, 44, it is desirable to omit the sub-slit portion 44 (see FIG. 3A).

Furthermore, in the said embodiment, although the main slit-shaped part 36 and the sub slit-shaped

parts

40 and 44 were comprised by the slit which penetrates the flange part 14 in a plate | board thickness direction, these main slit-shaped part 36 and the sub-slit-shaped part You may comprise 40 and 44 by the groove | channel which does not penetrate the flange part 14 in a plate | board thickness direction. Specifically, as shown in FIG. 7, the main slit-shaped portion may be constituted by a groove 38 having a bottom wall 38A. In this case, when the component force F ₁ (see FIG. 5) acting on the inner peripheral surface 32A of the counterbore part 32 becomes a predetermined value or more, the bottom wall 38A of the groove 38 constituting the main slit-like part cracks. The depth of the groove 38 may be set as appropriate so that the groove 38 opens.

Further, in a screw member having a taper on the seating surface 72 A like the countersunk screw 70, the seating surface 72 A of the countersunk screw 70 is at the edge of the mounting hole 30 even when the mounting hole 30 does not have the counterbore portion 32. When engaged, a pressing force in the direction of expanding the attachment hole 30 acts on the edge. Therefore, by forming the main slit-shaped portion 36 and the sub-slit-shaped

portions

40 and 44 even in the mounting hole 30 having no such counterbore portion 32, cracks and the like generated at the edge of the mounting hole 30 are suppressed. Can do.

The entire disclosure of the Japanese application (Japanese Patent Application No. 2011-189594) is incorporated herein by reference.
In addition, all documents, patent applications, and technical standards described in this specification are the same as when individual documents, patent applications, and technical standards are specifically and individually described to be incorporated by reference. Incorporated herein by reference.

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.

Claims

A joint pipe body,
A flange portion made of resin projecting radially outward from the joint pipe body portion;
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 main slit-shaped portion formed on the flange portion and extending from the mounting hole to an outer edge portion of the flange portion;
A sub-slit-shaped portion that is formed in the flange portion and extends from the mounting hole and does not reach the outer edge of the flange portion;
A pipe fitting comprising:
The pipe joint according to claim 1, wherein the sub slit-like part extends from the attachment hole to the outside of the joint pipe main body part.
The pipe joint according to claim 1 or 2, wherein the main slit-shaped portion and the sub-slit-shaped portion are slits penetrating the flange portion in the plate thickness direction.
The main slit-shaped part is formed on the opposite side to the joint pipe body part across the mounting hole,
The pipe joint according to claim 3, wherein the sub slit-like portion extends symmetrically with respect to the main slit-like portion.
The flange portion is formed in a circular shape concentric with the joint pipe main body when viewed from the axial direction of the joint pipe main body,
The main slit-shaped portion extends along the radial direction of the flange portion,
The pipe joint according to claim 4, wherein the sub slit-like portion extends in a direction orthogonal to the main slit-like portion.