JP3116271U - Connecting structure and connecting tool for outer tube and inner tube - Google Patents

Abstract

An outer tube-inner tube connection structure and a connector capable of reliably and stably performing connection and disassembly.
An outer tube, an inner tube to be inserted into the outer tube, an elastic annular portion that is supported by being pushed into the inner tube, and an engagement protrusion that protrudes outward from the surface of the annular portion. After the connecting tool is pushed into the inner tube and the engaging projection is movably engaged with the through hole formed in the inner tube, the inner tube is inserted into the outer tube, and the outer tube is formed. Engagement protrusions protruding from the through hole formed in the inner tube are movably engaged with the through hole.
[Selection] Figure 1

Description

The present invention relates to a connecting structure for connecting an outer pipe and an inner pipe and a connecting tool thereof, and is used, for example, when connecting a pipe joint that is a part of a pipe shelf and a pipe.

Conventionally, various connection structures and connectors are used to connect the outer tube and the inner tube.
For example, as shown in FIG. 9, Patent Document 1 discloses a configuration that includes a pipe 40, a pipe joint 41, and a V-shaped connector 42 that connects these pipes.

Registered Utility Model 3031487

The connector 42 includes a leaf spring main body 43 and an engagement protrusion 44 protruding from the outer side of the leaf spring main body, and has elasticity.
Then, the connector 42 is pressed into the support pipe 45 of the pipe joint 41 while being crushed and elastically deformed. The pipe 40 and the pipe joint 41 are connected by inserting the pipe 45 and engaging the engagement protrusion 44 protruding from the through hole 45a formed in the support pipe 45 with the through hole 40a formed in the pipe 40. doing.
Thereby, the pipe 40 and the pipe joint 41 are connected by the action of the elastic restoring force of the V-shaped connector 42.

When disassembling, the engaging projection 44 protruding from the through-hole 40a formed in the pipe 40 is pressed and moved (while the engagement between the through-hole 40a and the engaging projection 44 is released). The support tube 45 may be pulled out. At this time, the engagement between the through-hole 45a formed in the support tube 45 and the engagement protrusion 44 is not released, and the connection tool 42 remains and is fixed in the support tube 45, so that reconnection is easy. .

However, the above-described configuration has the following problems.
Since the connecting tool 42 is V-shaped and one end side is in an open state, the engaging protrusion 44 is excessively pressed or repeatedly connected and disassembled to easily deform and cause a decrease in elastic force. As a result, the connection between the pipe 40 and the pipe joint 41 is rattled or unexpectedly released.

Further, during the connection operation, the engagement protrusion 44 that has jumped out of the through hole 45a is pressed with a finger to elastically deform the connection tool 42, and the support tube 45 of the pipe joint 41 is inserted into the pipe 40 while maintaining this state. However, when the engaging protrusion 44 is pressed with a finger, the bending moment A acts on the engaging protrusion 44 because the connecting tool 42 is V-shaped as shown in FIG. As a result, the engagement protrusion 44 hits or gets caught in the through hole 45a of the support tube 45. As a result, inconveniences such as the inability to press the engagement protrusion 44 occur. Similarly, during the disassembling work, when the engaging projection 44 of the coupling tool 42 is pressed with a finger as shown in FIG. 10B, the bending moment is applied to the engaging projection 44 because the coupling tool 42 has a V shape. A works, and the engaging projection 44 hits or gets caught in the through hole 40a of the pipe 40 or the through hole 45a of the support tube 45. As a result, inconveniences such as the inability to press the engagement protrusion 44 occur.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an outer tube-inner tube connection structure and a connector that can be reliably and stably connected and disassembled.

  In order to solve the above-mentioned problem, in the connection structure of the outer tube and the inner tube according to claim 1 of the present invention, the outer tube, the inner tube inserted into the outer tube, and the inner tube are pushed and supported. A connecting portion having an annular portion having elasticity and an engaging protrusion protruding outward from the surface of the annular portion, and the connecting member is pushed into the inner tube, and a penetration formed in the inner tube. After the engagement protrusion is movably engaged with the hole, the inner tube is inserted into the outer tube, and the through-hole formed in the outer tube is ejected from the through-hole formed in the inner tube. The engagement protrusion is movably engaged.

  In the connection structure of the outer tube and the inner tube according to claim 2, the center of gravity of the annular portion is located on an extension line in the movement direction of the engagement protrusion.

  In the connection structure of the outer tube and the inner tube according to claim 3, the annular portion is axisymmetric with respect to the extension line in the movement direction of the engagement protrusion.

  In the connection structure of the outer tube and the inner tube according to claim 4, the annular portion has a width wider than the width of the other portion of the annular portion at a position opposite to the position where the engagement protrusion protrudes. The contact portion is formed.

6. The connection structure of an outer tube and an inner tube according to claim 5, wherein a prevention wall for preventing the connector from being excessively pushed is pushed into the inner tube more than a position where the connector is supported. It is characterized by being formed on the back side in the direction.

In the connecting device for connecting the outer tube and the inner tube according to claim 6, the connecting device includes an annular portion having elasticity and an engaging protrusion protruding outward from the surface of the annular portion. The connector is pushed into the inner tube, and the engaging projection is movably engaged with a through-hole formed in the inner tube, and then the inner tube is inserted into the outer tube to form the outer tube. The engaging projection protruding from the through hole formed in the inner pipe is movably engaged with the through hole formed.

  As described above, in the connection structure of the outer tube and the inner tube according to claim 1 of the present invention, since the connector having the annular portion having elasticity is used, one end side is in an open state as in the prior art. Therefore, the elastic restoring force can be improved. Thereby, even if it presses an engagement protrusion too much or it repeats connection and decomposition | disassembly, it can prevent that a connector deform | transforms and elastic force falls. Therefore, connection and disassembly can be performed reliably and stably.

  In the connection structure of the outer tube and the inner tube according to claim 2, since the center of gravity of the annular portion is on the extension line in the movement direction of the engagement protrusion, when the engagement protrusion is pressed during the connection operation and the disassembly operation, It is possible to press straight in the moving direction without generating a bending moment. As a result, the engagement protrusion does not hit or get caught in the through hole, so that connection and disassembly can be performed smoothly.

  Even in the connection structure of the outer tube and the inner tube of claim 3, the same effect as described above can be obtained.

In the connection structure of the outer tube and the inner tube according to claim 4, since the wide contact portion is in contact with the inner surface of the inner tube over a wide range, the displacement of the connector 3 in the front-rear and left-right directions is suppressed and supported The state can be made more stable.

  In the connection structure of the outer tube and the inner tube according to the fifth aspect, when the connector is pushed into the inner tube during the connection operation, the connector can be prevented from entering deeper than a predetermined place.

  In the connecting device for connecting the outer tube and the inner tube according to claim 6, since the connecting device has an annular portion having elasticity, the elastic restoring force can be improved as compared with the prior art. . Thereby, even if it presses an engagement protrusion too much or it repeats connection and decomposition | disassembly, it can prevent that a connector deform | transforms and elastic force falls. Therefore, connection and disassembly can be performed reliably and stably.

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a connection structure between a pipe joint and an inner pipe according to the present embodiment, which connects both using a connecting tool, and can be connected and disassembled as necessary.

The coupling structure of the pipe joint and the inner pipe includes an L-shaped pipe joint 1, an inner pipe 2 inserted into the pipe joint 1, and a connector 3 that is pushed into and supported by the inner pipe 2.

The pipe joint 1 is integrally formed of a plastic such as ABS or PP, and an outer pipe portion 4 having a hollow circular shape in a sectional view into which the inner pipe 2 is inserted is formed in two directions at right angles. A through hole 5 that penetrates from the outer surface toward the inner surface is formed in the outer tube portion 4, and the size of the through hole 5 is such that an engagement protrusion 9 of the connector 3 described later can be movably engaged. It is a size. Further, a ring-shaped bulging portion 6 is formed outwardly around the outer surface where the through hole 5 is formed. In addition, the cross-sectional shape of the outer tube | pipe part 4 has various aspects, such as cross-sectional hollow square shape and cross-sectional view hollow triangular shape other than the above-mentioned shape.

The inner tube 2 is a metal tube having a hollow circular shape in cross section, the surface of which is covered with a plastic such as ABS or PVC, and the outer diameter of the inner tube 2 is slightly smaller than the inner diameter of the outer tube portion 4. Further, the inner tube 2 is formed with a through hole 7 penetrating from the outer surface toward the inner surface, and the size of the through hole 7 is such that an engagement protrusion 9 of the connector 3 described later is movable. The size can be matched. In addition to the above-described shape, the inner tube 2 may have various shapes such as a hollow square shape in cross section and a hollow triangular shape in cross section, but the main shape is a shape that can be inserted into the outer tube portion 4. Anything is acceptable. Further, the through hole 5 and the through hole 7 overlap in a state where the inner tube 2 is inserted into the outer tube portion 4.

  The connector 3 is integrally formed of an engineer plastic such as polyacetal, and has a horizontally long elliptical annular portion 8 having a belt shape around the entire periphery, and an engaging projection protruding outward from the outer surface of the annular portion 8. 9.

The annular portion 8 has elasticity, and when the outer surface is pressed toward the inner surface, it is elastically deformed as shown in FIG. Further, a thick portion 10 is formed in the annular portion 8 and plays a role of reinforcing to prevent bending during elastic deformation. The thick portion 10 is thickened inward from the inner surface of the annular portion 8. Further, a disc-shaped contact portion 11 is formed at a position opposite to the position where the engagement protrusion 9 protrudes. Since the contact portion 11 is wider than the width of the other portion of the annular portion 8, when the connector 3 is pushed into and supported by the inner tube 2, the contact surface 11 is applied to the inner surface of the inner tube 2 over a wide range. The support state can be stabilized by contact.

  The pipe joint 1, the inner pipe 2 and the connector 3 formed as described above are connected as follows.

First, as shown in FIG. 3, the connector 3 is pushed into the inner tube 2. At the time of pushing in, the connector 3 is elastically deformed so as to be crushed in the vertical direction, and is put into the opening of the inner tube 2 while maintaining the state. Thereafter, the connector 3 is pushed into the inner tube 2 to engage the engaging protrusion 9 with the through hole 7 formed in the inner tube 2. As a result, the engaging projection 9 jumps out of the through hole 7, and the connector 3 is restored to its original shape by the restoring force and is supported by the inner tube 2 at that position. At this time, since the contact portion 11 of the connector 3 is in contact with the inner surface of the inner tube 2 over a wide range, the front / rear and right / left deviations of the connector 3 are suppressed and the support state can be further stabilized. .

Next, as shown in FIG. 4, the inner pipe 2 is inserted into the outer pipe portion 4 of the pipe joint 1. At the time of insertion, the connecting tool 3 is elastically deformed by pressing the engaging protrusion 9 that has jumped out of the through hole 7, and the inner tube 2 is inserted into the outer tube portion 4 while maintaining the state. Thereafter, the inner tube 2 is pushed into the outer tube portion 4 until the through-hole 7 formed in the inner tube 2 overlaps the through-hole 5 formed in the outer tube 4, and is engaged with the through-hole 5. The protrusion 9 is engaged. As a result, the engagement protrusion 9 is exposed from the through hole 5, and the connector 3 returns to its original shape by the restoring force. The exposed engagement protrusion 9 may or may not protrude from the distal end portion of the bulging portion 6 of the outer tube portion 4. Thus, the pipe joint 1 and the inner pipe 2 are connected by the connector 3 as shown in FIG. In addition, since the annular portion 8 of the coupler 3 is formed in a horizontally long oval shape, when the engaging protrusion 9 exposed from the through hole 7 is pressed, it is pressed straight in the moving direction without generating a bending moment. Can do. Thereby, since the engagement protrusion 9 does not hit or get caught on the periphery of the through-hole 7, the connection can be performed smoothly. This is because the annular portion 8 has a horizontally long elliptical shape so that the center of gravity of the annular portion 8 is positioned on the extension line of the engagement protrusion 9 or the annular portion 8 extends in the movement direction of the engagement protrusion. This is due to the line symmetry with respect to the line.

  In this way, the inner pipe 2 can be connected to the two outer pipe portions 4 of the pipe joint 1 respectively.

On the other hand, the pipe joint 1 and the inner pipe 2 connected as described above can be disassembled as follows.

The inner tube 2 is pulled out from the outer tube portion 4. When pulling out, the connecting projection 3 may be elastically deformed by pressing and moving the engaging protrusion 9 exposed from the through hole 5, and the inner tube 2 may be pulled while maintaining the state. Then, the engaging projection 9 enters the outer tube portion 4 and is pressed against the inner surface of the outer tube portion 4 and is elastically deformed, and the inner tube 2 is engaged with the through hole 7 of the inner tube 2. At the same time, it is pulled out in the pulling direction, and finally disassembled into the state shown in FIG. After the disassembly, the engaging protrusion 9 jumps out of the through hole 7, and the connector 3 returns to the original shape by the restoring force. In addition, since the annular portion 8 of the connector 3 is in the shape of a horizontally long ellipse, when the engaging protrusion 9 exposed from the through hole 5 is pressed, it is pressed straight in the moving direction without generating a bending moment. Can do. As a result, the engagement protrusion 9 does not hit or get caught by the peripheral edges of the through hole 5 and the through hole 7, so that the connection can be performed smoothly. This is because the annular portion 8 has a horizontally long elliptical shape so that the center of gravity of the annular portion 8 is positioned on the extension line of the engagement protrusion 9 or the annular portion 8 extends in the movement direction of the engagement protrusion. This is due to the line symmetry with respect to the line.

  If the connector 3 is damaged, etc., the connector 3 can be pulled out from the inner tube 2 as needed. However, considering reconnection after disassembly, the connector 3 is supported by the inner tube 2. It is better to leave it.

By connecting and disassembling, the annular portion 8 of the connector 3 is elastically deformed many times. However, since the thick portion 10 is formed in the annular portion 8, Bending can be prevented.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a view showing a connecting structure between a pipe joint and a rod body according to the second embodiment, which connects both using a connecting tool, and can be connected and disassembled as necessary. Yes. In addition, the description is abbreviate | omitted about the part which has the substantially same function and structure as 1st Embodiment.

The coupling structure of the pipe joint and the rod body includes a three-pronged pipe joint 21, a rod body 22 including a cylinder body 26 inserted into the pipe joint 21, and a connector 23 that is pushed into and supported by the cylinder body 26. It is configured.

In the pipe joint 21, an outer pipe portion 24 into which an inner pipe portion 27 of a cylindrical body 26 to be described later is inserted is formed at each of the three fork portions. A through hole 25 penetrating from the outer surface toward the inner surface is formed in the outer tube portion 24. The size of the through hole 25 is such that an engagement protrusion 32 of a connector 23 described later can be movably engaged. It is a size.

The rod body 22 is a round bar formed of wood, plastic or the like, and a cylinder body 26 is screwed to the end portion thereof. The cylindrical body 26 is integrally formed of a plastic such as ABS or PP. As shown in FIG. 7, the inner pipe portion 27 inserted into the outer pipe portion 24 of the pipe joint 21 and the end portion of the rod body 22 are inserted and fixed. And a wall portion 29 that partitions the inner tube portion 27 and the fixing recess 28. The outer diameter of the inner tube portion 27 is formed slightly smaller than the inner diameter of the outer tube portion 24. Further, the inner tube portion 27 is formed with a through hole 30 penetrating from the outer surface toward the inner surface, and the size of the through hole 30 is such that an engagement protrusion 32 of the connector 23 described later is movable. The size is such that it can be engaged. The through hole 25 and the through hole 30 overlap in a state where the inner tube portion 27 is inserted into the outer tube portion 24.

  The connector 23 includes a semicircular annular portion 31 having a belt shape around the entire periphery, and an engagement protrusion 32 that protrudes outward from the outer surface of the annular portion 30. The annular portion 31 is formed by an arc portion 33 having an engaging protrusion 32 and a flat portion 34.

  The pipe joint 21, the rod body 22, and the connector 23 formed as described above are basically connected and disassembled in the same procedure as in the first embodiment of the present invention.

The difference from the first embodiment is that, as shown in FIG. 8, the coupling tool 23 is pushed into the inner tube portion 27 of the cylindrical body 26, and the engagement protrusion 32 is inserted into the through hole 30 formed in the inner tube portion 27. When engaging, since the wall part 29 is formed in the back of the inner tube, it is possible to prevent the connecting tool 23 from entering the back by hitting the wall part 29. The wall portion 29 is formed on the far side in the pushing direction from the position where the connector 23 is supported by the inner tube portion 27 and close to the connector.

  As mentioned above, although this invention was demonstrated based on the typical Example, this invention can have various aspects besides having mentioned above.

  For example, in the first and second embodiments, the connection between the pipe joint, the inner tube, and the rod has been described, but the same can be said for the connection between the tube and the tube or between the tube and the rod. In short, any combination may be used as long as one member has a portion serving as an outer tube and the other member has a portion serving as an inner tube.

  Moreover, also about the annular part of a coupling tool, a rounded round rectangular shape, a rounded triangular shape, etc. are mentioned other than the above-mentioned shape. In short, any shape may be used as long as the center of gravity of the annular portion is positioned on the extension line of the engaging projection in the moving direction, or the annular portion is symmetrical with respect to the extension line of the engaging projection in the moving direction. .

  In the first and second embodiments, it has been described that the engagement protrusions 9 and 32 can be movably engaged with the through holes 5, 7, 25 and 30, but this movement is illustrated in FIG. 2 to 5 and the vertical direction of FIG.

Various products that can be connected and disassembled by using the outer tube and inner tube connection structure and connector of the present invention, such as a pipe shelf such as a tire rack composed of a pipe joint and a pipe pipe, and a pipe joint A fence composed of a rod or the like, or a clothesline composed of a pipe tube and a pipe tube can be provided.

1 is a perspective view showing a first embodiment of the present invention. It is a front view which shows the state which the connector of the embodiment elastically deformed. It is sectional drawing which shows the process until it pushes and supports a connection tool in an inner pipe in the connection operation | work of the embodiment. It is sectional drawing which shows the state in the middle of inserting the inner pipe | tube in the outer pipe | tube in the connection operation | work of the embodiment. It is sectional drawing which shows the state after the completion of a connection in the connection operation | work of the embodiment. It is a perspective view which shows 2nd embodiment of this invention. It is sectional drawing which shows the structure of the cylinder of the same embodiment. In the connection operation of the same embodiment, when the connection tool is pushed into and supported by the cylindrical body, the connection tool is prevented from entering the back by colliding with the wall portion. It is a perspective view which shows the prior art. It is sectional drawing which shows the prior art. In addition, (a) is a figure which shows the state which the bending moment is acting on the engagement protrusion, when pressing an engagement protrusion with a finger | toe in a connection operation | work. (B) is a figure which shows the state which the bending moment is acting on the engagement protrusion, when pressing an engagement protrusion with a finger in disassembly work.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Inner pipe 3 Connection tool 4 Outer pipe part 5 Through-hole (outer pipe part) 6 Swelling part 7 Through-hole (inner pipe) 8 Annular part 9 Engagement protrusion 10 Thick part 11 Contact part 21 Pipe joint 22 Bar body 23 Connecting tool 24 Outer pipe part 25 Through hole (outer pipe part) 26 Cylindrical body
27 Inner pipe portion 28 Fixing concave portion 29 Wall portion 30 (Inner tube portion) through hole 31 Annular portion 32 Engagement projection 33 Arc portion 34 Flat portion 40 Pipe 40a (Pipe) through hole 41 Pipe joint 42 Connector 43 Plate Spring body 44 Engaging projection 45 Support tube 45a (support tube) through hole A Bending moment

Claims (6)

  An outer tube, an inner tube inserted into the outer tube, a resilient annular portion that is pushed and supported by the inner tube, and an engaging projection that protrudes outward from the surface of the annular portion The coupling tool is pushed into the inner tube, and the engaging projection is movably engaged in a through hole formed in the inner tube, and then the inner tube is inserted into the outer tube, A connecting structure of an outer tube and an inner tube, wherein the engaging protrusion protruding from the through hole formed in the inner tube is movably engaged with a through hole formed in the outer tube.   The connection structure of the outer tube and the inner tube according to claim 1, wherein the center of gravity of the annular portion is located on an extension line of the engagement protrusion in the moving direction.   The connection structure of the outer tube and the inner tube according to claim 1, wherein the annular portion is axisymmetric with respect to an extension line in the movement direction of the engagement protrusion. The contact portion wider than the width of the other portion of the annular portion is formed in the annular portion at a position opposite to the position where the engagement protrusion protrudes. The connection structure of the outer tube and the inner tube according to any one of 3 above.   5. The inner pipe is formed with a prevention wall for preventing the connector from being excessively pushed in at a depth side in a pushing direction from a position where the connector is supported. The connection structure of the outer tube and the inner tube according to any one of the above.   A connector for connecting an outer tube and an inner tube, wherein the connector includes an elastic annular portion and an engagement protrusion protruding outward from the surface of the annular portion, and is connected to the inner tube. The coupling tool is pushed in, and the engaging projection is movably engaged with a through hole formed in the inner tube, and then the inner tube is inserted into the outer tube, and the through hole formed in the outer tube is inserted into the through hole formed in the outer tube. A connecting tool for connecting an outer tube and an inner tube, wherein the engaging protrusion protruding from a through hole formed in the inner tube is movably engaged.

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