JP2020112207A - Joint and connection structure - Google Patents

Abstract

To provide a joint which can be downsized compared to a conventional joint and facilitates operation of screwing.SOLUTION: A joint 100 includes: a hollow body 101 forming a communication space 102 communicating from one end to the other end therein; a screw part 103 which is formed at one end side of the hollow body 101 and screwed into a screwed part 12 of a first connection object 11; a cylindrical part 104 formed at the other end side of the hollow body 102 and having a fixture margin for enabling a hollow cylindrical end part 16 of a second connection object 15 to be inserted thereinto or the cylindrical part 104 to be inserted into the cylindrical end part 16 to fix the cylindrical end part 16; and an engagement part 106 which is provided at the fixture margin, enables a shaft member 110 to be arranged so that the shaft member 110 intersects with a pipe axis of the cylindrical part 104, and may engage with the shaft member 110.SELECTED DRAWING: Figure 1

Description

The present invention relates to a joint and a connection structure to be connected via the joint.

2. Description of the Related Art Conventionally, various joints have been used to connect two or more objects to be connected to each other, such as a pipe material and a device.

For example, Patent Document 1 discloses a pipe joint that connects a synthetic resin pipe to another connection target with a screw. Hereinafter, in this paragraph, the reference numerals of Patent Document 1 are shown in parentheses. At one end of the joint body (5) of the pipe joint (10), the inner tube portion (2) into which the pipe end portion (1a) of the synthetic resin pipe (1) is inserted, and the outside of the pipe end portion (1a). A guide portion (3) for positioning the inserted state and a surplus thickness accommodating portion (4) for accommodating the surplus thickness of the synthetic resin pipe (1) are provided. The other end of the joint body (5) is provided with an intermediate portion (5a), a hexagonal portion (5b), a connecting screw portion (5c) and a main body inner peripheral portion (5d) for connecting to another connection target. There is. The intermediate portion (5a) is a portion in which the inner cylindrical portion (2) for connecting the synthetic resin pipe (1), the guide portion (3), and the excess thickness accommodating portion (4) are integrated. It is for connecting to the hexagonal part (5b), the connection screw part (5c), and the inner peripheral part (5d) of the main body in order to connect to another connection target. The hexagonal part (5b) is a part for applying a wrench for screwing the pipe joint (5) to the connection target, and the connection screw part (5c) is screwed into the female screw hole of the connection target. The inner peripheral portion (5d) of the main body is coaxially communicated with the inner peripheral portion (2c) of the insertion tube of the insertion tube portion (2).

JP, 2011-58599, A

However, in the conventional screw-type joint having at least one screw portion as in Patent Document 1, in order to screw the end portion of the joint to the connection target, a tool such as a spanner is engaged with the hexagonal portion. Therefore, it is necessary to rotate and tighten the body of the joint relative to the connection target. In other words, the joint requires the formation of hexagons in the body for screwing and fastening to the connection object. Therefore, the joint requires a space for forming the hexagonal portion and is inevitably increased in size. Furthermore, if the axial length of the joint is designed to be short, the width of the hexagonal part in the axial direction also becomes narrower, which makes it easier for the tool to come off the hexagonal part, making it difficult to screw it on. there were. That is, there is a problem in that the hexagonal portion is provided for screwing on the joint so that dimensional design is restricted and operability during work is deteriorated.

The present invention has been made to solve the above problems, and an object thereof is to provide a joint that can be made smaller than conventional ones and that facilitates screwing operation.

The joint according to claim 1 is a joint that connects a first connection target and a second connection target,
A hollow main body that internally forms a communication space that communicates from one end to the other end,
A threaded portion that is formed on one end side of the hollow body and that is screwed to the threaded portion that is the first connection target;
A tubular portion formed on the other end side of the hollow main body, the tubular portion having a fixing allowance for inserting or externally fixing the hollow tubular end portion of the second connection target;
The locking member is provided in the fixing allowance, the shaft member is arranged so as to intersect with the cylinder axis of the cylindrical portion, and a locking portion engageable with the shaft member is provided.

According to a second aspect of the present invention, in the joint according to the first aspect, the locking portion is a through hole formed apart from a tip of the tubular portion.

The joint according to claim 3 is the joint according to claim 1 or 2, wherein the tubular portion is configured to be inserted into the tubular end portion of the second connection target, and the tubular portion and the threaded portion. An intermediate restricting portion that engages with the cylindrical end portion and restricts the movement of the second connection target toward the one end side is provided between the cylindrical portion and the cylindrical end portion.

The joint according to claim 4 is a joint for connecting a connection target and a hollow cylindrical pipe,
A hollow main body that internally forms a communication space that communicates from one end to the other end,
A threaded portion which is formed on one end side of the hollow body and which is screwed to the threaded portion to be connected,
A tubular portion that is formed on the other end side of the hollow main body and that fixes the tubular end portion of the hollow cylindrical tube by inserting or externally inserting it,
And a locking portion which is provided in the tubular portion, into which the shaft member can be inserted into the tubular portion, and which is engageable with the inserted shaft member.

The joint according to claim 5 is the joint according to any one of claims 1 to 4, wherein the tubular portion can bond the tubular end portion of the second connection target or the hollow cylindrical tube. It is characterized by having an adhesive surface.

The joint according to claim 6 is the joint according to any one of claims 1 to 5, wherein a distance between a proximal end of the threaded portion and a proximal end of the tubular portion is equal to that of the threaded portion. It is characterized in that it is shorter than the length of the portion and the tubular portion.

The connection structure according to claim 7 is a connection structure for connecting a first connection target and a second connection target via a joint,
The joint is
A hollow main body that internally forms a communication space that communicates from one end to the other end,
A threaded portion formed on one end side of the hollow body and screwed to the threaded portion of the first connection target;
A tubular portion having a fixing allowance, which is formed on the other end side of the hollow main body and in which the hollow tubular end portion of the second connection target is fixed by being inserted or externally attached,
In the fixing allowance, a penetrating portion that communicates the tubular portion inside and outside is formed, and the penetrating portion is closed by the tubular end portion.

The connection structure according to claim 8 is the joint according to any one of claims 1 to 6,
A first connection target screwed to one end of the hollow main body of the joint via a screwed portion,
A second connection target or a hollow cylindrical pipe fixed to the other end of the hollow main body of the joint via a tubular end portion.

According to the invention as set forth in claim 1, the shaft member is arranged so as to intersect with the cylinder axis of the tubular portion in the fixed margin of the tubular portion formed on the other end side of the hollow body, and is engaged with the shaft member. A locking portion that can be fitted is provided. With this, by engaging the shaft member with the locking portion from the intersecting direction of the tubular portion, the threaded portion of the joint is firmly fastened to the threaded portion of the first connection target, and both are easily screwed together. can do. Furthermore, since the locking portion and the fixing allowance are formed in the same region, it is not necessary to separately secure a region in which the locking portion is provided, and it is possible to further reduce the size of the entire joint. Therefore, the joint of the present invention can be made smaller in size than conventional ones, and facilitates the screwing operation.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, since the locking portion is formed of the through hole, the shaft member is inserted into the through hole and locked on the end surface of the through hole. Thus, the threaded portion of the joint can be firmly tightened on the threaded portion to be first connected.

According to the invention of claim 3, in addition to the effect of the invention of claim 1 or 2, the restricting portion engages with the tubular end portion of the second connection target to move to the one end side of the second connection target. By restricting the movement, it is possible to reliably fix the tubular end portion to the tubular portion.

According to the invention described in claim 4, the shaft member can be inserted into the cylindrical portion formed on the other end side of the hollow body, and the shaft member can be engaged with the inserted shaft member. A stop is provided. Thus, the shaft member is inserted into the tubular portion via the locking portion, and the shaft member inserted inside the tubular portion is engaged with the locking portion, so that the joint portion is joined to the threaded portion of the first connection target. The threaded portion of can be firmly tightened, and both can be easily screwed together. Further, since the locking portion is formed in the tubular portion, it is not necessary to separately secure a region in which the locking portion is provided, and it is possible to further reduce the size of the joint as a whole. Therefore, the joint of the present invention can be made smaller in size than conventional ones, and facilitates the screwing operation.

According to the invention of claim 5, in addition to the effect of any one of claims 1 to 4, the tubular portion is connected to the tubular end portion or the hollow cylindrical tube of the second connection target via the adhesive surface. It can be fixed by adhesion.

According to the invention of claim 6, in addition to the effect of any one of claims 1 to 5, the distance between the base end of the threaded portion and the base end of the tubular portion is set to The length of the joint as a whole can be effectively shortened by making it shorter than the length of the tubular portion.

According to the invention as set forth in claim 7, a penetrating portion that connects the tubular portion to the inside and the outside is formed in the fixing margin of the tubular portion formed on the other end side of the hollow main body of the joint. By inserting the shaft member into the through portion and locking the shaft member to the end surface of the through portion, when the connection structure is constructed, the threaded portion of the joint is firmly fixed to the threaded portion of the first connection target. Both can be easily screwed together. Moreover, since the locking part and the fixing allowance are formed in the same region of the joint, it is not necessary to separately secure a region for providing the locking part, and the size of the joint as a whole is reduced, resulting in a smaller connection structure. It becomes possible to do. Further, by fixing the cylindrical end portion to the fixing allowance, the penetrating portion formed in the fixing allowance is closed by the cylindrical end portion of the second connection target, and the communication space is exposed to the outside through the penetrating portion. Is effectively prevented.

According to the invention described in claim 8, the effect of any one of claims 1 to 6 can be exhibited as a connection structure. That is, the size of the connection mechanism of the present invention can be made smaller than that of the related art, and the screwing operation is facilitated when the connection mechanism is constructed.

The schematic perspective view of the joint of one embodiment of the present invention. The (a) top view of the joint of FIG. 1, (b) front view, (c) side view, and (d) bottom view. (A) AA sectional drawing of the joint of FIG. 2, and (b) BB sectional drawing. The schematic sectional drawing of the connection structure of one embodiment of the present invention. FIG. 5 is a schematic view showing a process of constructing the connection structure of FIG. 4. The schematic sectional drawing which shows the joint of another embodiment of this invention, and a connection structure. The schematic sectional drawing which shows the joint of another embodiment of this invention, and a connection structure. The schematic diagram showing the joint of another embodiment of the present invention. The schematic diagram showing the joint of another embodiment of the present invention. The schematic diagram showing the joint of another embodiment of the present invention. The schematic sectional drawing which shows the joint of another embodiment of this invention, and a connection structure. The schematic sectional drawing which shows the joint of another embodiment of this invention. FIG. 6 is a schematic exploded view showing a joint and a connection structure according to another embodiment of the present invention. The schematic sectional drawing which shows the connection structure of FIG.

An embodiment of the present invention will be described below with reference to the drawings. The shapes of the respective drawings referred to in the following description are conceptual diagrams or schematic views for explaining preferable shape dimensions, and the dimensional ratios and the like do not necessarily match the actual dimensional ratios. That is, the present invention is not limited to the dimensional ratios in the drawings.

A joint 100 according to an embodiment of the present invention is a threaded joint having at least one threaded portion, and is a connection end portion 11 of a device that is a first connection target and a hollow cylinder that is a second connection target. It is used to connect the pipe 15 to each other. However, the application is merely an example, and the first and second connection targets can be arbitrarily selected, and the joint of the present invention may be used for various applications. Hereinafter, the joint 100 of the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a schematic perspective view of the joint 100 of this embodiment. 2A to 2D are a plan view, a front view, a side view, and a bottom view of the joint 100. FIG. 3 is an AA vertical sectional view and a BB horizontal sectional view of the joint.

As shown in FIG. 1, a joint 100 according to one embodiment of the present invention includes a hollow main body 101 that linearly extends in a cylindrical shape from one end to the other end. The hollow main body 101 has a cylindrical peripheral wall whose one end and the other end are open, and forms a communication space 102 that communicates with the inside of the hollow main body 101 from one end to the other end. That is, the communication space 102 is a space that allows fluids such as gas and liquid and particles to pass from one end of the hollow main body 101 to the other end.

On one end side of the hollow main body 101, a screwing portion 103 that is screwed to a screwed portion (union nut 12) of the connection end portion 11 of the device that is the first connection target is provided. The threaded portion 103 extends in a predetermined length from the base end to the tip end along the axial direction. In the present embodiment, the threaded portion of the connecting end portion 11 extending in a tubular shape is the union nut 12 (see FIG. 5), and the threaded portion 103 is formed as a male threaded tubular body corresponding to this. There is.

On the other end side of the hollow main body 101, a tubular portion 104 to which the hollow tubular end portion 16 of the hollow cylindrical tube 15 which is the second connection target is fixed is provided. The tubular portion 104 extends along the axial direction from the base end to the tip with a predetermined length. The tubular portion 104 has a fixing allowance for inserting and fixing the tubular end portion 16 of the hollow cylindrical tube 15 over the entire axial direction. The fixed margin is a region where the tubular portion 104 and the tubular end portion 16 overlap each other when the tubular end portion 16 is externally inserted into the tubular portion 104. Then, at least a part of the outer surface of the fixing margin is formed as a smooth adhesive surface that can be adhered to the inner surface of the tubular end portion 16 with an adhesive.

An intermediate regulation portion 105 is provided in an intermediate region between the screwing portion 103 and the tubular portion 104 of the hollow body 101. The intermediate restricting portion 105 is located in an intermediate region between the base end of the threaded portion 103 and the base end of the tubular portion 104, and corresponds to the distance between the base end of the threaded portion 103 and the end of the tubular portion 104. It has an axial length. The axial length of the intermediate restriction portion 105 is preferably shorter than the lengths of the threaded portion 103 and the tubular portion 104. By shortening the intermediate regulating portion 105, the overall length of the connection structure 10 can be reduced, and in the connection structure 10, the joint 100 itself is made inconspicuous, which contributes to the improvement of its appearance. Further, the intermediate regulation portion 105 has a diameter larger than that of the threaded portion 103 and the tubular portion 104, and forms a step at the boundary thereof. The lower surface of the intermediate regulation portion 105 functions as a locking surface with which the end surface of the tubular end portion 16 abuts, and regulates the relative axial movement of the tubular end portion 16 toward the threaded portion 103 side. Further, a pair of recesses 108 are provided on the lower surface of the intermediate regulation portion 105. The pair of recesses 108 are located on opposite sides in the radial direction. The recess 108 may function as a groove for being fixed to the tubular portion 104 with an adhesive or for hooking a tool for prying and pulling out the tubular end portion 16 (see FIG. 4) that has been press-fitted. On the other hand, the upper surface of the intermediate restricting portion 105 can also function as a restricting surface that locks the screwed portion in the screwing direction when connected to the connection end portion provided in the device. However, in the connection structure 10 of the present embodiment, the union nut 12 crushes and stops the packing 18 before contacting the upper surface of the intermediate restriction portion 105. Sometimes it does not have to act as a regulatory aspect.

A locking portion 106 is provided in the fixed margin of the cylindrical portion 104. In the present embodiment, the locking portion 106 is composed of a pair of through holes formed in the central portion of the tubular portion 104 in the axial direction. Each through hole has a circular shape when viewed from the front, and is formed so as to be separated from the tip end edge of the tubular portion 104 toward the base end side. As shown in FIG. 3B, the pair of through holes are arranged on the opposite side in the radial direction of the tubular portion 104. In other words, the pair of through holes are arranged on a straight line passing through the center of the tubular portion 104 and define a linear through passage that penetrates the communication space 102 in the radial direction. That is, the locking portion 106 can dispose the linear shaft member 110 through the pair of through holes, and can lock the shaft member 110 in the rotation direction (or the circumferential direction).

Next, the connection structure 10 of one embodiment of the present invention will be described. FIG. 4 is a schematic cross-sectional view of the connection structure 10. The connection structure 10 connects the first connection target and the second connection target in a communicating state by the joint 100. In the present embodiment, the first connection target is, for example, the connection end portion 11 of a device (not shown) such as a water heater or a gas device. The connection end 11 discharges fluid or the like to the outside of the device, or flows fluid or the like from the outside to the inside of the device. The connection end portion 11 has a threaded portion including a union nut 12. In particular, the connecting end 11 is a flexible pipe made of steel (so-called stainless flexible pipe), and has a bendable hollow cylindrical shape that holds a union nut 12 that is a nut body having a female screw rotatably at the end. It may be a tubular body. Further, in the present embodiment, the second connection target is the hollow cylindrical pipe 15 such as a vinyl chloride pipe, a socket, a flexible pipe, or a pipe. Here, the hollow cylindrical tube 15 is a vinyl chloride tube. The hollow cylindrical tube 15 transports fluid or the like discharged from the outside of the device or transports fluid or the like from the outside to the inside of the device. The hollow cylindrical tube 15 has a tubular end portion 16 which is open at the tip. In the connection structure 10, the joint 100 connects the connection end 11 and the hollow cylindrical tube 15 in a watertight or airtight state.

More specifically, as shown in FIG. 4, the union nut 12, which is a threaded portion, is screwed to the threaded portion 103 at one end of the joint 100. An annular packing 18 is arranged between the opening end surface of the connection end portion 11 and the opening end surface of the screwing portion 103. The union nut 12 is screwed toward the base end side of the screwing portion 103 and is firmly tightened so as to crush the packing 18. The union nut 12 is stopped before the intermediate regulation portion 105. In this way, one end of the joint 100 is connected to the connection end 11 in a watertight or airtight state.

Further, as shown in FIG. 4, the tubular end portion 16 is externally attached and adhered to the tubular portion 104 at the other end of the joint 100. The open end surface of the tubular end portion 16 abuts on the lower surface of the intermediate regulation portion 105, and the outer surface of the tubular portion 104 closer to the base end than the locking portion 106 contacts the inner surface of the tubular end portion 16 at the distal end side. It is glued together. Since the tubular portion 104 is formed in a tapered shape, in FIG. 4, a gap is formed between the lower edge of the locking portion 106 and the tubular end portion 16. Since (in the drawing) is filled in this gap and solidified, the entire peripheral edge of the through hole is joined to the inner surface of the cylindrical end portion 16. That is, the locking portion 106 is closed by the inner surface of the tubular end portion 16. Therefore, there is no need to separately close the locking portion 106. In this way, the other end of the joint 100 is connected to the tubular end portion 16 in a watertight or airtight state. Further, a recess 108 is arranged between the open end surface of the tubular end portion 16 and the lower surface of the intermediate regulation portion 105. The joint 100 and the hollow cylindrical tube 15 can be separated by inserting a tool such as a flat-blade screwdriver into the recess 108 and prying.

The connection structure 10 of the present embodiment is suitable for application to a drainage pipe because the first and second connection targets are firmly connected in a watertight state, and can be applied even in an environment where a certain amount of water pressure is applied. .. Further, in the configuration in which the tubular portion 104 is externally inserted into the tubular end portion 16 as shown in FIG. 4, for example, when the tubular portion 104 is used for natural drainage in a place where water pressure is not applied, the tubular portion 104 is attached to the tubular end portion 16. It may be inserted without being adhered. In such a case, a small gap is formed between the peripheral edge of the through hole of the locking portion 106 and the outer surface of the cylindrical end portion 16, and the locking portion 106 is not closed. Since the locking portion 106 is located inside the tubular end portion 16, the fluid passing through the communication space 102 of the joint 100 can also pass through the locking portion 106. However, since the through hole is located in the hollow portion of the tubular end portion 16 and is isolated from the external space by the peripheral wall of the tubular end portion 16, drainage does not leak to the outside. Therefore, there is no need to separately close the locking portion 106.

Next, with reference to FIG. 5, a method for constructing the connection structure 10 according to the embodiment of the present invention will be described.

First, the joint 100 is connected to the union nut 12 of the connecting end 11 (before connecting to the tubular end 16 of the hollow cylindrical tube 15). As shown in FIG. 5A, for example, a rod-shaped shaft member 110 such as a driver is inserted into the pair of through holes of the locking portion 106. At this time, the shaft member 110 penetrating the pair of through holes of the locking portion 106 is arranged in the locking portion 106 so as to be engageable with the end surface of the through hole. That is, the shaft member 110 can be locked by the locking portion 106 when rotating in the circumferential direction with respect to the joint 100. Then, the opening end of the connection end portion 11 is aligned with the opening end of the screwing portion 103, and the union nut 12 is rotated and screwed into the screwing portion 103. Then, the union nut 12 is screwed forward with respect to the screwing portion 103, and the shaft member 110 is strongly pressed while being tightened with a tool such as a spanner. At this time, since one shaft member 110 penetrates through holes formed at two locations on the peripheral wall, rotation of the hollow main body 101 of the joint 100 around the shaft is restricted, and the union nut 12 Effectively support tightening with other tools. Although the shaft member 110 preferably penetrates both of the pair of through holes as illustrated, it may be inserted into only one of the through holes depending on the situation.

Next, as shown in FIG. 5B, the hollow cylindrical tube 15 is connected to the joint 100 connected to the connection end 11. First, the adhesive is applied to the outer surface of the tubular portion 104 of the joint 100 on the proximal end side or the inner surface of the tubular end portion 16 of the hollow cylindrical tube 15. The tubular end portion 16 of the hollow cylindrical tube 15 is externally inserted into the tubular portion 104 of the joint 100, and the tubular end portion 16 is pushed in the axial direction until the end surface comes into contact with the locking surface of the intermediate regulation portion 105. The tubular end portion 16 is arranged so as to overlap with the fixing margin of the tubular portion 104. Then, the tubular portion 104 and the tubular end portion 16 can be fixed by solidifying the adhesive with the passage of time, thermosetting, or the like. Through the above steps, the connection structure 10 shown in FIG. 4 can be easily constructed.

Hereinafter, an operation effect in joint 100 of one embodiment concerning the present invention is explained.

According to the joint 100 of the present embodiment, the shaft member 110 is arranged so as to intersect the tubular axis of the tubular portion 104 in the fixed margin of the tubular portion 104 formed on the other end side of the hollow main body 101, and A locking portion 106 that can be engaged with the member 110 is provided. As a result, by engaging the shaft member 110 with the locking portion 106 from the direction in which the tubular portion 104 intersects, the threaded portion of the joint 100 is screwed onto the threaded portion (the union nut 12 in the present embodiment) that is the first connection target. The joint portion 103 can be firmly tightened and both can be easily screwed together. Further, since the locking portion 106 and the fixing allowance are formed in the same region, it is not necessary to separately secure a region in which the locking portion 103 is provided, and the joint 100 as a whole can be further downsized. Therefore, the joint 100 of the present embodiment can be made smaller in size than conventional ones, and can be easily screwed.

Further, in the joint 100 of the present embodiment, the tubular portion 104 has an adhesive surface for adhering the tubular portion 104 that is the second connection target, and the screwing portion 103 is the screwed portion (union nut) that is the first connection target. 12) Screw on. That is, the joint 100 connects the first and second connection targets with connection means having different adhesion and screwing. In the case of a joint, which does not have a structure corresponding to the locking portion of the present invention and which connects two connection targets with different bonding and screwing connection means, as in the related art, between the bonding portion and the screwing portion of the joint body. It was necessary to engage a wrench on the hexagonal portion and screw the first connection target onto the joint. At the time of this screwing operation, the spanner may slip from the hexagonal portion and come into contact with the second connection target (for example, a PVC pipe), so that the screwing connection can be performed after the adhesive is completely dried. Takes time. On the other hand, the joint 100 of the present embodiment is configured so that the shaft member 110 is engaged with the locking portion 106 formed on the tubular portion 104 at the time of screwing connection, and therefore, the screw engagement is performed. The work is performed before the bonding work, and thereafter, the adhesive is applied to the outer surface (or the inner surface) of the cylindrical portion 104, and the hollow cylindrical tube 15 is externally inserted (or inserted) and left alone. I'm done. Therefore, the joint 100 of the present embodiment is also improved in terms of the process of connection work.

[Other Embodiments/Modifications]
The present invention is not limited to the above embodiment, and various embodiments and modifications can be adopted. Hereinafter, another embodiment and modification of the present invention will be described. In addition, in each of the embodiments, a component whose last two digits are common among components indicated by three digits has the same or similar characteristic unless otherwise described, and the description thereof is partially omitted.

(1) The joint and connection structure of the present invention are not limited to the above-described embodiment, and the tubular end portion of the first connection target may be externally inserted and connected to the tubular portion. FIG. 6 shows a connection structure 20 with a joint 200 according to the second embodiment of the present invention. The joint 200 of FIG. 6 is configured such that the tubular end portion 26 is inserted into the tubular portion 204 and bonded to the joint 100 of the first embodiment. As shown in FIG. 6, the locking portion 206 (through hole) formed in the fixing margin of the tubular portion 204 (the overlapping region with the tubular end portion 26) is fixed to the adhesive by the tubular wall of the tubular end portion 26. Have been closed through. As a result, the internal space of the connection structure 20 is isolated from the external space in a sealed state. As shown in FIG. 6, when the tubular end portion 26 is inserted into and connected to the tubular portion 204, the packing is provided on the proximal end side of the locking portion 206 of the tubular portion 204 regardless of the adhesion. The communication space 202 can be made watertight also by separately providing (not shown).

(2) The joint and the connection structure of the present invention are not limited to the above-mentioned embodiment, and the threaded portion to be the first connection target may be inserted and connected to the threaded portion. FIG. 7 shows a connection structure 30 using a joint 300 according to the third embodiment of the present invention. The joint 300 of FIG. 7 is configured such that the joint portion 100 of the first embodiment is configured such that the threaded portion 303 is internally inserted with the threaded portion 32 that is the first connection target, and is screwed. That is, in the joint 300, the threaded portion 303 is formed as a female threaded tubular body, and the threaded portion 32 is formed as a male threaded tubular body. In this embodiment, by inserting the shaft member into the locking portion 306, the screwing operation can be facilitated as in the above embodiment.

(3) The joint of the present invention is not limited to the above embodiment, and the dimensions and shape thereof may be changed arbitrarily. FIG. 8 shows a joint 400 according to the fourth embodiment of the present invention. The joint 400 of FIG. 8 differs from the joint 100 of the first embodiment in the shape of the locking portion 406. For example, the locking portion 406 of the present embodiment includes a pair of rectangular through holes. The shape is optimum when the shaft member has a rectangular cross section. That is, those skilled in the art can arbitrarily select the shape of the locking portion. Moreover, the number of through holes may be one or three or more as long as the locking portion functions to lock the shaft member. Furthermore, the shape of each through hole may not be uniform.

(4) The joint of the present invention is not limited to the above embodiment, and the locking portion may be formed in a groove shape. FIG. 9 shows a joint 500 according to the fifth embodiment of the present invention. The joint 500 of FIG. 9 differs from the joint 100 of the first embodiment in the shape of the locking portion 506. The locking portion 506 is a pair of grooves cut out from the leading edge of the tubular portion 504 to the base end side. In the present embodiment, by disposing the shaft member in the groove of the locking portion 506, the shaft member can be locked in the rotation direction (circumferential direction) with respect to the hollow main body 501 of the joint 500. Since the locking portion 506 is a groove, there is an advantage that the shaft member can be easily arranged in the groove of the locking portion 506, but the shaft member is easily pulled out from the groove of the locking portion 506. There are drawbacks.

(5) The joint of the present invention is not limited to the above embodiment, and the locking portion may be formed so as to project from the tip of the tubular portion. FIG. 10 shows a joint 600 according to the sixth embodiment of the present invention. The joint 600 of FIG. 10 differs from the joint 100 of the first embodiment in the shape of the locking portion 606. The locking portions 606 are a pair of annular bodies protruding from the tip edge of the tubular portion 604. The lower end of the annular body may be opened to form the groove. In the present embodiment, by disposing the shaft member in the ring of the locking portion 606, the shaft member can be locked in the rotation direction (circumferential direction) with respect to the hollow main body 601 of the joint 600.

(6) The joint and connection structure of the present invention are not limited to the above embodiment, and the tubular portion may be connected to the tubular end portion of the second connection target by another connecting means. FIG. 11 shows a connection structure 70 using a joint 700 according to the seventh embodiment of the present invention. The joint 700 of FIG. 11 is configured such that the tubular end portion 76 is press-fitted and connected to the tubular portion 704 with respect to the joint 100 of the first embodiment. In this way, the connecting means between the tubular portion of the joint and the tubular end portion of the second connection target is not limited to bonding, and various connecting means can be selected.

(7) The joint of the present invention is not limited to the above embodiment, and the configuration thereof may be changed arbitrarily. FIG. 12A shows a joint 800 according to the eighth embodiment of the present invention. The joint 800 of FIG. 12 is different from the joint 100 of the first embodiment in that the intermediate regulating portion is changed. As shown in FIG. 12A, the intermediate restricting portion 805 may be configured as a locking surface between the screwing portion 803 and the tubular portion 804 without extending in the axial direction. The intermediate restriction portion 805 can function to lock the tubular end portion of the second connection target by its locking surface. Further, as shown in FIGS. 12B, 12C, and 12D, the tubular portions 904, A04, and B04 may have an external thread or internal thread tubular shape. That is, the tubular portion of the present invention and the tubular end portion of the second connection target are not limited to the adhesive means, and may be configured to be connected by the screwing means.

(8) In the joint of the present invention, the intermediate regulation portion may be provided with a polygonal outer surface or flat surfaces facing each other so that a spanner can be hung. The intermediate regulation portion may be used as an auxiliary in addition to the locking portion during the screwing operation. For example, FIGS. 13 and 14 show a connection structure C0 and a joint C00 according to another embodiment of the present invention. As shown in FIG. 13, the joint C00 includes an intermediate restriction portion C05 having a hexagonal outer surface. In this embodiment, the first connection target is the drainage drain connection end C1 of the water heater, and the second connection target is the indirect drainage joint C5. As shown in FIG. 14, the threaded portion C03 of the joint C00 is connected to the union nut C2 of the connection end portion C1, and the tubular portion C04 is inserted in the tubular end portion C6 of the indirect drainage joint C5. In this connection structure C0, the union nut C2 can be removed by applying a spanner to the intermediate regulation portion C05. At this time, the contacted portion of the indirect drainage joint C5 with which the lower surface of the intermediate regulation portion C05 abuts (the outer surface adjacent to the intermediate regulation portion C05) can function as the wrench prevention.

(9) In the above embodiment, the joint extends linearly in the axial direction, but in the present invention, the hollow body is bent or bent so that the threaded portion and the tubular portion of the joint extend at different angles. You may have.

(10) In the above-described embodiment, the joint is provided with one threaded portion and one tubular portion, but the threaded portion and the tubular portion of the joint are not departing from the technical scope of the present invention. One or both of them may be formed in plural.

The present invention is not limited to the above-described embodiments and modified examples, and can be implemented in various modes within the technical scope of the present invention.

10 connection structure 11 connection end (first connection target)
12 Union nut (threaded part)
15 Hollow cylindrical pipe (second connection target)
16 Cylindrical End 18 Packing 100 Joint 101 Hollow Body 102 Communication Space 103 Threading Part 104 Cylindrical Part 105 Intermediate Limiting Part 106 Locking Part (Through Hole, Through Part)
108 recess 110 shaft member

Claims (8)

A joint for connecting the first connection target and the second connection target,
A hollow main body that internally forms a communication space that communicates from one end to the other end,
A threaded portion that is formed on one end side of the hollow body and that is screwed to the threaded portion that is the first connection target;
A tubular portion formed on the other end side of the hollow main body, the tubular portion having a fixing allowance for inserting or externally fixing the hollow tubular end portion of the second connection target;
A joint provided on the fixing allowance, the shaft member being arranged so as to intersect with the cylinder axis of the cylindrical portion, and a locking portion engageable with the shaft member. The joint according to claim 1, wherein the engaging portion is a through hole formed apart from the tip of the tubular portion. The tubular portion is configured to be inserted into the tubular end portion of the second connection target, and is engaged with the tubular end portion between the threaded portion and the tubular portion, The joint according to claim 1 or 2, further comprising: an intermediate restriction portion that restricts movement of the second connection target toward one end. A joint for connecting a connection target and a hollow cylindrical pipe,
A hollow main body that internally forms a communication space that communicates from one end to the other end,
A threaded portion which is formed on one end side of the hollow body and which is screwed to the threaded portion to be connected,
A tubular portion that is formed on the other end side of the hollow main body and that fixes the tubular end portion of the hollow cylindrical tube by inserting or externally inserting it,
A joint provided on the tubular portion, into which the shaft member can be inserted into the tubular portion, and which is engageable with the inserted shaft member. The joint according to any one of claims 1 to 4, wherein the tubular portion has an adhesive surface capable of adhering the tubular end portion of the second connection target or the hollow cylindrical tube. The distance between the base end of the threaded portion and the base end of the tubular portion is shorter than the length of the threaded portion and the tubular portion. Fitting described in paragraph. A connection structure for connecting a first connection target and a second connection target via a joint,
The joint is
A hollow main body that internally forms a communication space that communicates from one end to the other end,
A threaded portion formed on one end side of the hollow body and screwed to the threaded portion of the first connection target;
A tubular portion formed on the other end side of the hollow main body, the tubular portion having a fixing margin in which the hollow tubular end portion of the second connection target is inserted or externally fixed.
A connection structure, wherein a through portion that communicates the inside and outside of the tubular portion is formed in the fixing margin, and the through portion is closed by the tubular end portion. A joint according to any one of claims 1 to 6,
A first connection target screwed to one end of the hollow main body of the joint via a screwed portion,
A second connecting object or a hollow cylindrical tube fixed to the other end of the hollow main body of the joint via a cylindrical end portion, the connecting structure.

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