JP4954769B2 - Connection structure, connection tool, and connection method - Google Patents

Description

  The present invention relates to a connection structure, a connection tool, and a connection method, and for example, relates to a connection structure, a connection tool, and a connection method that are used when maintaining a connection state of a pair of connected members.

As a pipe connection structure, a technique using a connection fitting for holding a connection between a pair of pipes is known. As this connection fitting, one having a structure in which an elastically deformable part is formed in an annular shape and a groove is provided in the circumferential direction is known (for example, see Patent Document 1). In the connection fitting of such a configuration, after fitting the pair of pipes so as to match the flanges formed respectively, while elastically deforming to open the connection fitting, in the connection part of the flange of the pair of pipes, A pair of flanges are fitted and used from the outer peripheral side of the pipe so that the pair of flanges fit into the grooves. The pair of flanges are fixed by the peripheral portion of the groove, and the connection of the pair of pipes is maintained.
JP-A-7-260071

  However, the above technique has the following problems. That is, after connecting a pair of pipes, the connection tool is put on the outer peripheral side and fitted, so that the number of steps required at the installation site is large.

  Then, an object of this invention is to provide the connection structure which can reduce the number of processes in the case of a connection, a connection tool, and the connection method.

A connecting device according to one aspect of the present invention connects a first connected member having an outer protruding portion that protrudes outward on an outer surface thereof, and a second connected member having an outer protruding portion that protrudes outward on an outer surface thereof. A plate-shaped member made of a metal material is formed into a curved shape having an opening, and has two pieces opposed to each other across a predetermined reference axis, and the pieces are in contact with each other. A first inner convex portion that is configured to be elastically deformable in a direction, and a portion on one side in the reference axial direction of the piece portion is bent inward and elastically deformable outward by the axial force. And the other inner side portion of the piece in the reference axis direction includes a second inner convex portion bent inward, and in a connected state, the two pieces are connected to a pair of the connected members. The connection part of the Wherein the sandwiching an outer projection of the outer projecting portion of the first connected member between the first inner protrusion and the second inner protrusion second connected member.

  The connection tool according to an aspect of the present invention is attached to the outer peripheral surface of the first connected member, and the second connected member is in a state where the first connected member is held between the two pieces. The first inner protrusion is pressed against the outer protrusion and elastically deformed outward by relative movement in the axial direction between the two pieces so as to be close to the first connected member. The outer protrusions get over the first inner protrusions so that the outer protrusions of the pair of connected members are disposed between the first and second inner protrusions, and the one piece is the It is mounted so as to straddle the outer periphery of the connection portion of the pair of connected members, and the variation of the relative position in the axial direction of the connection portion of the pair of connected members is regulated by the first and second inner convex portions. It is characterized by.

  In the connecting device according to one aspect of the present invention, the two pieces are configured in an arc shape, and the first inner convex portion is configured such that a portion on one side in the axial direction of the piece is an outer portion from a central portion in the axial direction. And the cut-out portion is inwardly of the outer protruding portion of the second connected member in the mounted state from the end portion in the axial direction toward the center side. The elastic tongue is bent so as to protrude obliquely, and the second inner convex portion is more than the outer protruding portion of the first connected member when the end portion on the other axial side of the piece is attached. Is a small-diameter portion that is bent inwardly so as to protrude inward and is curved in a small-diameter arc shape on the inner side.

  The connection tool according to an aspect of the present invention includes two claw portions that are configured such that portions of the piece portions that are separated from each other in the circumferential direction extend in the outer direction, and the claw portions are The openings are elastically deformed so that the openings of the connection tools are widened by forces that are close to each other.

  The connection structure according to an aspect of the present invention includes the connection tool, a female circular tube portion having a female hole portion therein, and an outer periphery of the female circular tube portion as the outer protruding portion at the distal end portion of the female circular tube portion. A female pipe as the second connected member including a female flange having a larger diameter than
  A male tube having a male hole inside, a male flange formed at the tip of the male tube as the outer projecting portion and having a larger diameter than the outer periphery of the male tube, and the tip of the male tube A male pipe as the second connected member having a cylindrical insertion pipe portion having a smaller diameter than the female hole of the female pipe extending in the axial direction from
With
  The piece is mounted so as to cover the outer peripheral surface of the male flange from the outer peripheral side while elastically deforming in the separation direction, and the male flange is positioned between the first and second inner convex portions on both sides. Then, while being held by the connector, the insertion tube portion is inserted into the female hole portion, and the female tube is relatively close to the male tube inside the two pieces. By moving, the female flange passes over the first inner convex part while elastically deforming the first inner convex part, and the pair of flanges are arranged between the first and second inner convex parts, and the female The mold tube and the male tube are held by the two pieces from the outer peripheral side, and fluctuations in the relative position in the axial direction are restricted.

According to one aspect of the present invention, there is provided a connection method including: a first connected member having an outer protrusion protruding outward on an outer surface of the connection tool; and a second target having an outer protrusion protruding outward on the outer surface. The second connected member is brought close to the first connected member in the axial direction in a state where the second connected member is mounted on the outer periphery of the first connected member of the pair of connected members configured by the connecting member. By pressing the outer protruding portion over the first inner protruding portion while elastically deforming the first inner protruding portion, and the outer protruding portion is interposed between the first and second inner protruding portions. The relative position of the pair of connected members in the axial direction is regulated by being sandwiched and disposing the connecting tool across the connecting portion of the pair of connected members.

  According to the present invention, the number of steps for connection can be reduced.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In each drawing, the configuration is appropriately enlarged, reduced, or omitted. In the figure, arrows X, Y, and Z indicate three directions orthogonal to each other. Here, the arrow X is the axial direction, the arrow Y is the horizontal diameter direction, and the arrow Z is the vertical diameter direction.

  FIG. 1 schematically shows a connection fitting 10 according to the present embodiment. The connection fitting 10 is attached to the outer periphery of the connection portion of the pipes 20 and 30 in a state where the pair of female pipes 20 (second connected members) and the male pipe 30 (first connected member) are fitted to each other. And has the function of maintaining these connections. In the connection fitting 10, a rectangular thin plate member made of metal is bent and deformed into an Ω-shape, and extends in an arc shape from the upper knob portion 11 and the lower end of the knob portion through the bent portion in the figure, and is opposed to each other. The left and right curved portions 12 (one portion) and the return portion 13 bent from the lower ends 12a of the left and right curved portions 12 and extending outward in the left and right directions are integrally provided, and are configured symmetrically in the Z direction. In FIG. 1, the center axis C of the arc that is the center of the curved portions indicated by the imaginary line is the reference axis.

The knob portion is bent and formed in a U-shaped cross section that opens downward in FIG.
The left and right curved portions 12 are each curved in an arc shape, and a biasing portion (second inner convex portion) 14 that is curved with a smaller curvature than the outer surfaces of the flanges 23 and 33 and a larger curvature than the outer surfaces of the flanges 23 and 33. A curved flange peripheral portion 15 and an elastic tongue portion (first inner convex portion) 16 as a claw portion protruding radially inward from the curved portion 12 are integrally provided. The curved portion 12 other than the urging portion 14 and the elastic tongue portion 16 is curved with the same diameter as the flange peripheral portion 15. The biasing portion 14, the flange peripheral portion 15, and the elastic tongue 16 are arranged so that, in the mounted state, the biasing portion 14 is positioned on the male tube 30 side and the elastic tongue 16 is positioned on the female tube 20 side. Parallel to the direction. The connection fitting 10 can be elastically deformed in the outward direction indicated by an arrow A in FIG. 3 so that the lower ends 12a of the left and right curved portions 12 are separated from each other and the opening 10a between the lower ends 12a is widened.

  The urging portion 14 is configured such that an end edge of the bending portion 12 on the male tube 30 side protrudes inward in the radial direction and is curved and formed in an arc shape having a smaller diameter than the outer surface of the flange 33. The urging portion 14 has a predetermined length in the circumferential direction, and is disposed outside the male circular tube 31 in the mounted state.

  The flange peripheral portion 15 is provided at a central portion in the axial direction of the left and right curved portions 12 and has a larger diameter than the flanges 23 and 33. The width of the flange peripheral portion 15, that is, the dimension in the axial direction indicated by the arrow X in the figure is set in accordance with the sum of the width of the female flange 23 and 33 of the male flange. The flange peripheral portion 15 is located on the outer periphery of the flanges 23 and 33 in the mounted state.

  The elastic tongue portion 16 is formed on the female tube 20 side of the bending portion 12. The elastic tongue 16 is formed with a U-shaped notch that opens toward the female tube 20 in a part of the curved portion 12, and a rectangular tongue formed by the notch is obliquely bent radially inward. Composed. The elastic tongue 16 can be elastically deformed in the direction so that the tip thereof moves radially outward as indicated by an arrow B in FIG. The elastic tongue 16 has a function of urging the female tube 20 from the outer peripheral side by its elastic restoring force and holding the female flange 23 from the distal end portion so as not to be separated from the male tube 30 in the axial direction.

  An opening 13 a reaching the return portion 13 is formed in the axial center portion of the bending portion 12 and below the flange peripheral portion 15. The axial dimension of the opening 13a is set in accordance with the total width of the female flange 23 and the male flange 33. A pair of flanges 23, 33 are provided inside the flange peripheral portion 15 in the mounted state. Be placed.

  A procedure of a connection structure and a connection method for connecting the female pipe 20 and the male pipe 30 using the connection fitting 10 configured as described above will be described. A female tube 20 shown in FIG. 2 includes a circular female tube 21 whose axial center extends in the X direction in the drawing, and a female hole that is provided inside the female tube 21 and forms a flow channel extending in the axial direction. A portion 22 and a female flange 23 (outer protruding portion) formed at the end of the female tube 20 on the side connected to the male tube 30 and having a larger diameter than the female tube 21 are provided. .

  The male tube 30 includes a circular male tube 31 having an axial center extending in the X direction in the drawing, a male hole portion 32 that is provided inside the male circular tube 31 and constitutes a channel extending in the axial direction, A male flange 33 (outer protruding portion) having a larger diameter than the circular tube 31 and a cylindrical insertion tube portion 34 having a smaller diameter than the male circular tube 31 and inserted into the female hole portion 22 of the female circular tube 21. And integrated. The outer peripheral surface of the insertion tube portion 34 has a diameter slightly smaller than the inner diameter of the female hole portion 22, and the plurality of groove portions 34 a formed on the outer periphery of the insertion tube portion 34 have a female hole portion in a connected state. A plurality of O-rings 35 are provided as sealing materials that are in close contact with the inner wall of 22. The male hole portion 32 reaches the distal end surface of the insertion tube portion 34 and communicates with the female hole portion 22 in the connected state. A portion of the male circular pipe 31 that is separated from the male flange 33 and further separated from the male flange 33 by a predetermined distance in the male circular pipe 31 constitutes a large diameter portion 36 having the same diameter as the flange. The urging portion 14 of the connection fitting 10 is locked in the groove portion 37 formed between the flange 33.

  In the connection process of the present embodiment, first, the connection fitting 10 is mounted so as to cover the end of the male tube 30 from the outer peripheral side. Here, for example, the lower ends of the bending portions 12 on both sides of the connection fitting 10 are pressed against the outer periphery of the end portion of the male pipe 30 and pressed in the Y direction perpendicular to the axial direction, for example, so that the lower ends of the bending portions 12 are separated from each other. The connector fitting 10 is mounted while moving downward along the outer periphery of the male tube 30 while spreading. In the mounted state, the pressing force is released, the flange peripheral portion 15 is disposed on the outer periphery of the male flange 33, and the biasing portion 14 is disposed on the groove portion 37 on the outer periphery of the male circular tube 31 in the vicinity of the male flange 33. At this time, the direction of the reference axis C and the axial direction of the male tube 30 coincide with each other along the X direction.

  Next, the female tube 20 is moved in the axial direction so as to be close to the male tube 30 so that the insertion tube portion 34 is inserted into the female hole portion 22. At this time, when the tip of the female flange 23 of the female tube 20 presses the elastic tongue 16 in the axial direction by the axial pressing force, the elastic tongue 16 is elastically deformed so that the tip moves in the pressing direction and outward. . When the female flange 23 passes over the elastic tongue 16 and reaches the flange peripheral portion 15 while further pressing, the elastic tongue 16 returns to the inner side due to the elastic restoring force and the front end of the elastic tongue 16 and the rear end of the female flange 23. Engage. In this mounted state, a pair of flanges 23, 33 are arranged inside the flange peripheral portion 15, and the flange 23 is formed by the biasing portion 14 and the elastic tongue 16 that protrude inward from the flange peripheral portion 15 on both axial sides thereof. 33 are sandwiched and fixed. Thereby, the connection state of a pair of piping 20 and 30 is maintained firmly.

  When releasing the connection, for example, a force is applied in the opposite direction to the connection in the radial direction while elastically deforming the lower ends of the bending portions 12 of the connection fitting 10 so that the bending portions 12 spread. It can be removed from the connecting portion by moving in the Y direction along the outer circumference of the pipes 20 and 30 while being elastically deformed. As a result, the holding state is released, and the connection of the pair of pipes is released.

The connection fitting 10, the connection structure, and the connection method according to the present embodiment have the following effects. That is,
By attaching the connecting fitting 10 to the male pipe 30 in advance, it is possible to connect the male pipe 30 only by the axial movement of inserting the male pipe 30 into the female hole portion 22 via the connecting fitting 10 at the time of pipe connection. Therefore, the number of processes at the pipe connection site can be reduced. Moreover, since it can connect only by the insertion movement of an axial direction, it can connect easily also when the space around the connection part of piping is small.

  In addition, since the elastic tongue portion 16 that is obliquely folded inwardly is formed, the elastic tongue portion 16 can be easily inserted and can be firmly fixed only by being inserted in the axial direction. Furthermore, the connection fitting 10 is easy to manufacture because it can be formed integrally by cutting and bending a thin plate-like member.

  Furthermore, in this embodiment, since the structure and the process for attaching the connection fitting 10 to the male tube 30 side in advance are used, it can be inserted without coming into contact with the O-ring 35. As a result, damage to the O-ring can be prevented.

  The connection fitting 10 of this embodiment can also be attached so that the connection part of a pair of piping 20 and 30 may be covered from an outer peripheral side. Therefore, it can be properly used according to conditions such as environment and space when connecting pipes.

[Second Embodiment]
Next, a connection fitting 40, a connection structure, and a connection method according to a second embodiment of the present invention will be described with reference to FIGS. In each drawing, the configuration is appropriately enlarged, reduced, or omitted. In the figure, arrows X, Y, and Z indicate three directions orthogonal to each other. Here, the arrow X is the axial direction, the arrow Y is the horizontal diameter direction, and the arrow Z is the vertical diameter direction. About the matter common to the connection metal fitting 10 in Embodiment 1, the corresponding member name and related code | symbol are used, and the detailed description is abbreviate | omitted.

  As in the case of the connection fitting 10, the connection fitting 40 is formed by bending and deforming a rectangular thin plate member made of metal into an Ω-shape, and via an upper knob portion 41 in the drawing and a lower end of the knob portion 41 via a bent portion. The left and right curved portions 42 that extend in an arc shape and the return portion 43 that is bent from the lower ends 42a of the left and right curved portions and extends to the left and right sides are integrally provided, and are configured symmetrically.

  An urging portion 44, an opening 43a, and an elastic tongue 46 are formed in the left and right curved portions, respectively.

  The opening 43a is a central portion in the axial direction of the bending portion 42, and is formed in a long hole shape extending in the circumferential direction at a portion where the flanges 23 and 33 are disposed at the time of mounting. The dimension in the axial direction of the opening 43 a is set in accordance with the total dimension of the widths of the female flange 23 and the male flange 33. The male tube 30 side of the curved portion 42 with respect to the opening 43 a is curved so that the inner surface thereof has a smaller curvature than the outer peripheral surface of the male flange 33, thereby constituting the biasing portion 44. The female pipe 20 side of the opening 43 a is curved with a larger curvature than the female flange 23.

  The elastic tongue 46 formed on the female tube 20 side of the curved portion 42 is a rectangular tongue formed by two cuts and a long hole formed on the peripheral edge of the opening 43a on the female tube 20 side. Is configured to be folded inwardly.

  For example, the connection fitting 40 having the above-described configuration is formed by forming two elongated hole-shaped openings 43a in a metal plate-like member, and then bending both sides thereof with different diameters and bending the tongue portion inwardly. Consists of.

  The connection method for connecting the male tube 30 and the female tube 20 using the connection fitting 40 according to the present embodiment is performed by mounting the connection fitting 40 on the male tube 30 in advance, as in the first embodiment. The female tube 20 is pressed in the axial direction so that the insertion tube portion 34 of the male tube 30 with the connection fitting 40 attached thereto is inserted into the female hole portion 22. At this time, the elastic tongue portion 46 is easily deformed by being deformed, and the connection state is firmly maintained by the biasing portion 44 and the elastic tongue portion 46.

  Also in the present embodiment, the same effect as in the first embodiment can be obtained.

[Third Embodiment]
Next, a connection fitting 50, a connection structure, and a connection method according to a second embodiment of the present invention will be described with reference to FIGS. In each drawing, the configuration is appropriately enlarged, reduced, or omitted. In the figure, arrows X, Y, and Z indicate three directions orthogonal to each other. Here, the arrow X is the axial direction, the arrow Y is the horizontal diameter direction, and the arrow Z is the vertical diameter direction. About the matter common to the connection metal fitting 10 in Embodiment 1, the corresponding member name and related code | symbol are used, and the detailed description is abbreviate | omitted.

  As with the connection fitting 10, the connection fitting 50 is formed by bending a rectangular thin plate member made of metal into an Ω-shape and extending in a circular arc shape from the lower end of the knob portion 51 and the knob portion 51 via a bent portion. The left and right curved portions 52 and the return portion 53 that is bent from the lower ends 52a of the left and right curved portions and extends outward in the left and right directions are integrally provided, and are configured symmetrically. The left and right curved parts 52 are respectively formed with an urging part 54, an opening 53a, a flange peripheral part 55, and an elastic tongue part 56.

  The opening 53a is a central portion in the axial direction of the bending portion 52, and is a long hole portion 53b having a long hole shape extending in a circumferential direction at a portion where the flanges 23 and 33 are disposed at the time of mounting, and the long hole portion 53b. An L-shaped L-shaped hole 53c extending from the upper end to the male side and extending in the Y-axis direction, and two cuts extending in the axial direction from the peripheral edge on the male tube 30 side of the central portion in the vertical direction of the long hole portion 53b A notch 53d is provided. The tongue part constituted by the notch part 53d is bent inward as in the first and second embodiments to constitute the elastic tongue part 56. A rectangular piece formed above the flange peripheral portion 55 by the opening 53 a is bent in the outward direction of the bending portion 52 to form a claw portion 58. By pinching the left and right claw portions 58 close to each other, the connection fitting 50 can be easily held with one hand, and can be easily elastically deformed to widen the lower opening of the connection fitting 50.

  For example, the connection fitting 50 having the above-described configuration is formed by forming two openings 53a in a metal plate-like member, then bending both sides in the axial direction with different diameters and bending the tongue portion inwardly to form a rectangular piece. It is configured by bending and deforming the part outward.

  When the male pipe 30 and the female pipe 20 are connected using the connection fitting 50 according to the present embodiment, the opening of the connection fitting 50 is widened by pinching the claw portion 58 in advance, and the first embodiment and the first embodiment. Similarly, the male tube 30 is attached to the outer periphery of the male tube 30, the female tube 20 is pressed in the axial direction on the male tube 30 in the fitting state, and the insertion tube portion 34 is inserted into the female hole portion 22. At this time, the elastic tongue portion 56 can be easily mounted by being deformed, and the connection state is firmly maintained by the biasing portion 54 and the elastic tongue portion 56.

  Also in this embodiment, the same effect as the first embodiment and the second embodiment can be obtained. Further, since the claw portion 58 is formed, it can be easily elastically deformed and can be easily mounted with one hand. Moreover, when removing, it can be easily removed with one hand. Therefore, the removal work in a narrow place is facilitated, and the drop-off is prevented during the removal work.

[Fourth Embodiment]
Next, a connection fitting 60, a connection structure, and a connection method according to a fourth embodiment of the present invention will be described with reference to FIGS. Since the connection metal fitting 60 of this embodiment is the same as that of the connection metal fitting 10 in Embodiment 3 except for the extension part 69, the related code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  An extension part 69 made of, for example, a synthetic resin is provided at the tip of the claw part 68 of the connection fitting 60. Concavities and convexities extending in the axial direction are formed on the outer surface of the extending portion 69 to constitute a non-slip portion 69a.

  Also in this embodiment, the same effect as the third embodiment can be obtained. Furthermore, since the extension part 69 is formed, even when the connection fitting 60 is small as a whole or when the claw part 68 is small, it can be easily grasped and can be elastically deformed with a small force. It becomes.

  The present invention is not limited to the above-described embodiments as they are. In an implementation stage, the present invention may be embodied by modifying constituent elements such as specific shapes and materials of the respective parts without departing from the scope of the invention. it can.

The perspective view which shows the connection metal fitting concerning 1st Embodiment of this invention. The perspective view which shows the structure of the female type | mold pipe | tube concerning 1st Embodiment of this invention, and a male type | mold pipe | tube. The front view which shows the structure of the connection metal fitting concerning 1st Embodiment of this invention. The rear view which shows the structure of the connection metal fitting. The side view which shows the structure of the connection metal fitting. The top view which shows the structure of the connection metal fitting. The bottom view which shows the structure of the connection metal fitting. Sectional drawing which shows the connection process concerning 1st Embodiment of this invention. Sectional drawing which shows the connection process concerning 1st Embodiment of this invention. The front view which shows the structure of the connection metal fitting concerning 2nd Embodiment of this invention. The rear view which shows the structure of the connection metal fitting. The side view which shows the structure of the connection metal fitting. The top view which shows the structure of the connection metal fitting. The bottom view which shows the structure of the connection metal fitting. The front view which shows the structure of the connection metal fitting concerning 3rd Embodiment of this invention. The rear view which shows the structure of the connection metal fitting. The side view which shows the structure of the connection metal fitting. The top view which shows the structure of the connection metal fitting. The bottom view which shows the structure of the connection metal fitting. The front view which shows the structure of the connection metal fitting concerning 4th Embodiment of this invention. The rear view which shows the structure of the connection metal fitting. The side view which shows the structure of the connection metal fitting. The top view which shows the structure of the connection metal fitting. The bottom view which shows the structure of the connection metal fitting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Connection metal fitting, 12 ... Bending part (one part), 14 ... Energizing part, 15 ... Flange peripheral part,
16 ... elastic tongue, 20 ... female tube, 21 ... female tube, 22 ... female hole, 23 ... female flange,
30 ... Male pipe, 31 ... Male circular pipe, 32 ... Male hole part, 33 ... Male flange, 34 ... Insertion pipe part,
36 ... large diameter portion, 37 ... groove, 40 ... connecting bracket, 42 ... curved portion, 44 ... biasing portion, 46 ... elastic tongue, 50 ... connecting bracket, 52 ... curved portion, 54 ... biasing portion, 55 ... Flange peripheral part, 56 ... elastic tongue part, 58 ... claw part, 60 ... connection fitting, 68 ... claw part, 69 ... extension part.

Claims (6)

A first connected member having an outer protrusion protruding outward on an outer surface thereof, a second connector for connecting the connected member having an outer protrusion protruding outward on the outer surface thereof,
A plate-shaped member made of a metal material is configured in a curved shape having an opening, has two pieces opposed to each other with a predetermined reference axis, and is configured to be elastically deformable in a direction in which the two pieces come into contact with and away from each other. And
A first inner convex portion configured such that a portion on one side of the one portion in the reference axial direction is bent inward and elastically deformable outward by the axial force;
A portion on the other side of the one portion in the reference axis direction includes a second inner convex portion bent inward;
In the connected state, the connection portions of the pair of connected members are held from the outer periphery by the two pieces, and the first covered portion is interposed between the first inner protruding portion and the second inner protruding portion in the reference axis direction. A connection tool characterized by sandwiching an outer protrusion of the connection member and an outer protrusion of the second connected member. The second connected member is attached to the outer peripheral surface of the first connected member , and the second connected member comes close to the first connected member in a state where the first connected member is held between the two pieces. said by between the two support sections move relative to the axial direction, the first inner protrusion is pushed is elastically deformed outwardly to the outer protrusions, wherein the outer projecting portion of the first inner projection by overcoming the section, the outer circumference of the outer protrusion is disposed between the first and second inner protrusions, the piece part is connected portions of the pair of the connecting members of a pair of the connected member mounted to span connection of claim 1, wherein the regulating the variation of the relative position in the axial direction of the connecting portion of the pair of the connected member by said first and second inner protrusions Ingredients. The both pieces are configured in an arc shape,
The first inner convex portion is cut out in a U-shape in which a portion on one side in the axial direction of the piece portion opens from a central portion to an outer portion in the axial direction , and the cut-out portion is in the axial direction. An elastic tongue that is bent so as to protrude obliquely inward from the outer protruding portion of the second connected member in the mounted state from the edge portion to the center side,
The second inner convex portion is bent inward so that the end portion on the other axial side of the piece portion protrudes inwardly from the outer protruding portion of the first connected member in the mounted state. The connecting tool according to claim 1, wherein the connecting tool is a small-diameter portion curved in a small-diameter arc shape . It has a two claws portions away from each other configured bent so that each extends in the outward direction in the circumferential direction of the front Kihen portion, the said connecting device by force to close the claw portion to each other 4. The connector according to claim 1, wherein the connector is elastically deformed so that the opening is widened . A connection tool according to any one of claims 1 to 4,
A female circular tube portion having a Mesuana portion therein, the distal end portion of the female circular tube portion, said second object connection and a female flange having a diameter larger than the outer circumference of the female circular pipe section as the outer protrusion A female tube as a member ;
A male tube having a male hole inside, a male flange formed at the tip of the male tube as the outer projecting portion and having a larger diameter than the outer periphery of the male tube, and the tip of the male tube the male tube as the second connected member having an insertion tube portion, a cylindrical small diameter than Mesuana of the female pipe extending axially from,
With
The piece is mounted so as to cover the outer peripheral surface of the male flange from the outer peripheral side while elastically deforming in the separation direction, and the male flange is positioned between the first and second inner convex portions on both sides. Then, while being held by the connector, the insertion tube portion is inserted into the female hole portion, and the female tube is relatively close to the male tube inside the two pieces. By moving, the female flange passes over the first inner convex part while elastically deforming the first inner convex part, and the pair of flanges are arranged between the first and second inner convex parts, and the female The connection structure, wherein the mold tube and the male tube are held by the two pieces from the outer peripheral side, and variation in relative position in the axial direction is restricted. The connector according to any one of claims 1 to 4 ,
Of the pair of connected members configured by a first connected member having an outer protruding portion protruding outward on the outer surface and a second connected member having an outer protruding portion protruding outward on the outer surface. In a state of being mounted on the outer periphery of the first connected member,
By pressing the second connected member so as to be close to the first connected member in the axial direction, the outer protruding portion elastically deforms the first inner convex portion inside the two pieces. while overcoming the outer protrusion is sandwiched between the first and second inner protrusions, by disposing across the connector to the connection portion of the front Symbol pair of the connected member, of the pair to be The connection method characterized by restricting the relative position of the connecting member in the axial direction.

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