JP2020070921A - Flexible tube joint and locking tool for joint - Google Patents

Abstract

To simplify a structure of a locking tool for a flexible tube joint, facilitate a production thereof, and reduce the production cost.SOLUTION: A flexible tube joint 2 to which a locking tool 30 is installed includes a joint body 10 and a nut 20 screwed thereto. A flexible tube 1 is inserted from a through hole 24 of the nut 20 into a connection hole 13 of the joint body 10. The locking tool 30 is made of metal, and includes an annular base part 31 and a plurality of locking pieces 32 provided along a peripheral direction of the base part 31. The plurality of locking pieces 32 are provided on a depth side in the connection hole 13 of the joint body 10 from the nut 20. It is inclined from the base part 31 to a bottom of the joint body 10 in a radial and inner directions. When the flexible tube 1 is inserted into the joint 2, the locking tool 30 elastically deforms the locking pieces 32 to allow the flexible tube 1 to pass to the bottom side, and the tip of the locking pieces 32 abuts against an outer peripheral face of the flexible tube 1 thereby locking the flexible tube 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a flexible pipe joint into which a bellows-shaped flexible pipe is inserted from a through hole of a support member attached to a joint body, and a locking tool for the joint.

  As a conventional flexible pipe joint, one disclosed in Patent Document 1 below has a joint body having a connection hole formed therein and a through hole formed therein, and the joint body is screwed to an end portion of the joint body. And a support member that supports the flexible tube. By inserting a flexible tube having a bellows shape into the connection hole from the through hole of the support member, the joint and the flexible tube can be connected with one touch.

  In such a flexible pipe joint, a locking tool for preventing the flexible pipe from coming out is mounted in the joint body. The locking member is formed in a ring shape as a composite member in which a metal member and a synthetic resin body are integrally molded, and is arranged inside the connection hole of the joint body on the inner side of the support member. The locking device includes an annular base portion having a notch formed in the longitudinal direction of the joint, and a locking piece protruding inward in the radial direction from a rear end of the base portion in a direction orthogonal to the longitudinal direction of the joint. I have it.

  When the flexible pipe is inserted through the through hole of the support member, the crest portion of the flexible pipe hits the locking piece and passes through it while expanding the diameter of the locking tool, and the flexible tube is engaged with the locking piece between the crest portion and the crest portion. Be stopped. As a result, the flexible pipe is connected to the joint in a retaining state. When a force is applied to the flexible tube in the direction of withdrawal, the locking piece receives the force from the crest portion of the flexible tube to the inlet side in the longitudinal direction of the joint and prevents the withdrawal.

JP 2002-250488 A

  In the above conventional technique, the locking tool is a composite member formed by integrally molding a metal member and a synthetic resin body, and has a complicated structure. Further, the locking piece of the locking tool projects in the direction orthogonal to the longitudinal direction of the joint. Therefore, when the flexible pipe passes through the locking tool, the outer diameter of the locking tool is expanded, so that a space such as an annular recess is formed in the connection hole of the joint body to allow the locking tool to expand its diameter. Need to be formed. Therefore, the joint body is increased in size. Further, since it is necessary to form the locking tool thick so as to withstand the force in the direction of pulling out, not only the locking tool but also the joint body to which this is mounted are further increased in size, and the flexible pipe is engaged. A large amount of force was required to pass the fastener deep inside.

The fastener of the present invention made to solve at least one of the above problems is mounted on a flexible pipe joint. The flexible pipe joint includes a joint body having a connection hole formed therein, and a support member attached to an end of the joint body having a through hole formed therein and the connection hole being opened. A flexible tube having a bellows shape is inserted into the connection hole through the through hole of the support member.
The locking tool is made of a metallic material, and includes an annular base portion and a plurality of locking pieces arranged along the circumferential direction of the base portion. The plurality of locking pieces are arranged on the inner side of the support member in the connection hole of the joint body, and are inclined so as to advance inward in the radial direction from the base toward the inner side of the joint body. There is.
When the flexible tube is inserted into the joint, the flexible piece is allowed to pass backward by elastically deforming the locking piece, and the tip of the locking piece hits the outer peripheral surface of the flexible tube to be flexible. Characterized by locking the tube.

  According to the above configuration, the structure of the locking tool for the flexible pipe joint is simplified. Further, since the locking piece of the locking tool has elasticity and is inclined, the flexible tube can be easily passed to the back side of the locking tool, and the flexible tube can be easily inserted into the joint. Is becoming At this time, since the outer diameter of the locking tool is not expanded, it is not necessary to form a space for accommodating the expanded diameter portion of the locking tool in the connection hole, and the joint body is not increased in size. Since the tip of the locking piece hits the outer peripheral surface of the flexible tube, when a force in the direction of withdrawal acts on the flexible tube, a force acts on the locking piece in the direction along the surface, and the locking piece has high strength and is flexible. Can be locked to prevent it from coming out.

Preferably, the annular base portion has a seat portion facing or abutting the tip end surface of the support member in the inner peripheral portion, and an outer peripheral plate portion in the outer peripheral portion, the plurality of the plurality of from the inner peripheral side of the seat The locking piece extends, and the outer peripheral plate portion is formed by bending the outer peripheral side of the seat portion in a direction intersecting the radial direction of the seat portion.
According to the above configuration, the outer peripheral portion of the base portion of the locking member is formed with the outer peripheral plate portion that is bent in a direction intersecting the radial direction of the seat portion of the inner peripheral portion, so that the shape of the locking member can be changed in the radial direction. The size of the joint can be reduced, and the size of the joint can be reduced.

Preferably, the outer peripheral plate portion of the base portion is bent in the axial direction of the base portion so as to cover the outer periphery of the distal end portion of the support member, and a radial direction is provided between the outer peripheral plate portion and the outer periphery of the distal end portion. There is play.
According to the above configuration, since there is radial play between the outer peripheral plate portion of the engaging member and the outer periphery of the tip end portion of the supporting member, the tip end hits the inclined engaging piece when the flexible tube is inserted. At this time, the axis of the fastener is aligned with the axis of the flexible tube. Thereby, the insertion load of the flexible pipe can be reduced and the flexible pipe can be easily inserted. Further, even if the support member rotates about the axis with respect to the joint body, it is possible to prevent the locking tool from rotating together. As a result, it is possible to prevent the flexible tube locked by the locking tool from rotating together with the flexible tube from being twisted.

Preferably, slits extending from the seat portion to the outer peripheral plate portion are formed in the base portion at a plurality of positions along the circumferential direction.
When inserting the flexible pipe into the back side of the locking device, the seat portion tends to fall inward in the radial direction as the locking piece elastically deforms outward in the radial direction. If there is no slit, the receding of the seat part is blocked by the outer peripheral plate part, and the repulsive force acts on the locking piece, but according to the above configuration, the repulsive force of the locking piece is weakened by the formation of the slit, and the insertion resistance is reduced. The flexible tube can be made smaller and inserted into the fitting.

Preferably, a relaxation hole is formed in the seat portion between the base end portions of the adjacent locking pieces.
According to the above configuration, the relaxation hole is formed so that the length of the locking piece in the radial direction is substantially lengthened, and when the flexible tube is inserted into the back side of the locking tool, the repulsion that acts on the locking piece. The force can be weakened, the insertion resistance can be reduced, and the flexible pipe can be inserted into the joint.

Another aspect of the present invention has a joint main body having a connection hole formed therein, and a support member attached to an end of the joint main body having a through hole formed therein and the connection hole being opened. A flexible pipe joint in which a bellows-like flexible pipe is inserted into the connection hole, wherein the locking member is mounted in the connection hole, and the base of the locking device in the connection hole of the joint body is A taper-shaped lock receiving portion is formed on the back side, the diameter of which decreases toward the back side, and the outer peripheral portion of the base of the locking tool can contact the lock receiving portion.
According to the above configuration, when the flexible pipe is inserted deeper than the locking device, the outer peripheral portion of the base portion of the locking member abuts the tapered lock receiving portion, so that, for example, the seat of the inner peripheral portion of the base portion is abutted. Compared with the case where the portion is brought into contact with a flat surface, the locking piece is more likely to be deformed radially outward, the insertion resistance is reduced, and the flexible pipe can be inserted into the joint.

Another aspect of the present invention has a joint main body having a connection hole formed therein, and a support member attached to an end of the joint main body having a through hole formed therein and the connection hole being opened. Is a flexible pipe joint in which a bellows-shaped flexible pipe is inserted into the connection hole, wherein the locking member is mounted in the connection hole, and the joint is provided on the inner peripheral side of the tip end surface of the support member. An annular protrusion extending toward the inner side of the main body is provided, and a radially outer portion of the annular protrusion is a tapered surface that reduces in diameter toward the inner side of the joint body. The locking piece and the seat portion of the locking tool can contact the tip end surface, respectively.
According to the above configuration, in the locking tool that locks the flexible tube when the force in the pull-out direction acts on the flexible tube, the locking piece and the seat portion respectively contact the tapered surface and the tip end surface of the support member. As a result, the locking piece is less likely to be deformed inward in the radial direction, and the flexible pipe can be more difficult to come out of the joint.

Another aspect of the present invention has a joint main body having a connection hole formed therein, and a support member attached to an end of the joint main body having a through hole formed therein and the connection hole being opened. Is a flexible pipe joint in which a bellows-shaped flexible pipe is inserted into the connection hole, the locking member is mounted in the connection hole, and the flexible pipe is inserted from the through hole of the support member into the connection hole. When the flexible pipe is inserted into the locking member, the ridge portion of the flexible tube is inserted into the inner peripheral surface of the connection hole on the inner side of the locking piece of the locking tool and on the front side of the locking piece. The flexible pipe is supported by being brought into contact with the inner peripheral surface of the through hole of the support member.
According to the above configuration, the flexible pipe connected to the joint is supported at two points, the inner peripheral surface of the connecting hole of the joint main body and the inner peripheral surface of the through hole of the supporting member, sandwiching the locking piece of the locking tool. Therefore, the robustness against the bending load applied to the flexible pipe is enhanced, and the locking performance can be enhanced.

Another aspect of the present invention has a joint main body having a connection hole formed therein, and a support member attached to an end of the joint main body having a through hole formed therein and the connection hole being opened. A flexible pipe joint in which a bellows-shaped flexible pipe is inserted into the connection hole, wherein the locking member is mounted in the connection hole, and the support member is screwed into the connection hole of the joint body. A wall portion, which is attached and in which the tip of the flexible tube abuts, is formed in the connection hole of the joint body on the back side of the locking tool, and the flexible tube extends from the through hole of the support member to the connection hole. Is inserted into the wall portion, abuts against the wall portion, and is locked to the locking tool, and the support member is screwed toward the back side of the connection hole, so that the flexibility on the back side of the locking tool is increased. The pipe is the locking piece and the wall It is crushed by a flexible tube is connected by the joint body and the airtight state.
According to the above configuration, when the locking tool crushes the flexible tube by the screwing operation of the support member, the locking tool for locking the flexible tube applies the tip of the locking piece to the outer peripheral surface of the flexible tube. Therefore, the reaction force from the flexible tube acts in the direction along the surface of the locking piece, and the locking piece can crush the flexible tube with high strength. Further, when the outer peripheral plate portion of the base portion of the locking tool is bent so as to cover the outer periphery of the tip end portion of the support member, there is a radial play between the outer peripheral plate portion and the outer periphery of the tip end portion of the support member. Therefore, even if the support member is screwed, the locking tool can be prevented from rotating together. As a result, it is possible to prevent the flexible tube locked by the locking tool from rotating together with the flexible tube from being twisted.

  According to the present invention, the structure of the locking tool for the flexible pipe joint is simplified, the manufacturing thereof can be facilitated, and the manufacturing cost can be reduced.

It is sectional drawing of the joint for flexible pipes, and the locking tool attached to the same joint concerning 1st Embodiment of this invention. It is a figure which shows the same locking tool, (A) is a perspective view, (B) is a top view, (C) is sectional drawing which follows CC line of FIG. 2 (B), (D) is a bottom view. Is. It is sectional drawing which shows the connection process of the flexible pipe to the said joint for flexible pipes, (A) shows the state which the said flexible pipe passes the same locking tool, (B) shows FIG. 3 (A). It is an enlarged view of the circle part B. FIG. 6 is a cross-sectional view showing the same connecting step, showing a state in which the flexible pipe is locked by the locking tool and the connection to the joint is completed. (A) It is sectional drawing which shows the state in which the force of the pull-out direction acted on the same flexible pipe connected to the joint for the same flexible pipe. (B) It is an enlarged view of the circle part B of FIG. 5 (A). It is sectional drawing of the joint for flexible pipes, and the locking tool attached to the same joint concerning 2nd Embodiment of this invention. (A) It is sectional drawing of the nut and the locking tool of the joint for flexible pipes. (B) It is an enlarged view of the circle part B of FIG. 7 (A). It is a figure which shows the same locking tool, (A) is a perspective view, (B) is a top view, (C) is sectional drawing which follows CC line of FIG. 8 (B). FIG. 4A is a cross-sectional view showing a step of connecting the flexible pipe to the flexible pipe joint, showing (A) a state in which the flexible pipe is locked to the locking tool at an initial tightening position of the nut of the joint. 9B shows a state in which the nut is tightened until the joint body of the flexible pipe and the joint body of the joint are in an airtight state, and the connection is completed. It is sectional drawing of the joint for flexible pipes, and the locking tool attached to the same joint concerning 3rd Embodiment of this invention. It is a figure which shows the 1st modification of the locking tool which concerns on this invention, (A) is a bottom view, (B) is sectional drawing which follows the BB line of FIG. 11 (A). It is a figure which shows the 2nd modification of the locking tool which concerns on this invention, (A) is a bottom view, (B) is sectional drawing which follows the BB line of FIG. 12 (A). It is a figure which shows the 3rd modification of the locking tool which concerns on this invention, (A) is a bottom view and (B) is a side view. It is a top view which shows the 4th modification of the locking tool which concerns on this invention. It is a top view which shows the 5th modification of the locking tool which concerns on this invention. It is a figure which shows the 6th modification of the locking tool which concerns on this invention, (A) is a top view, (B) is sectional drawing which follows the BB line of FIG. 16 (A). It is sectional drawing which shows the state which the 7th modification of the locking tool which concerns on this invention was mounted in the joint for flexible pipes.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
The flexible pipe joint 2 shown in FIG. 1 is called a one-touch joint in which the pipe and the joint are connected only by inserting the flexible pipe 1. The joint main body 10 and the flexible joint that is attached to the joint main body 10 by screwing. A nut 20 (supporting member) that supports the pipe 1 is a main constituent element. The flexible tube 1 is composed of a thin metal bellows tube 1a and a resin covering tube 1b that covers the outer periphery of the bellows tube 1a. The bellows tube 1a has a mountain portion 1m and a valley portion 1v. The flexible pipe 1 is connected to the joint 2 in a state where the covering pipe 1b is removed from several peaks of the bellows pipe 1a.

  In the joint 2, the joint body 10 is formed of a metal such as brass into a tubular shape, and a taper male screw 11 is formed on the outer circumference at one end side (the left side in FIG. 1) to be attached to other pipes or instruments. It is designed to be used. The joint body 10 is formed with a gas hole 12 extending from one end to the other end to an intermediate portion and a connection hole 13 extending from the intermediate portion to the other end, and the connection hole 13 has a larger diameter than the gas hole 12. There is.

  In the connection hole 13 of the joint body 10, a female screw portion 13a, a locking tool receiving portion 13b, a locking projection 13c, and a sealing material accommodating portion 13d are arranged in this order from the opening on the other end side toward the inner side. , And a bellows tube housing portion 13e. As shown in FIG. 3B, the locking projection 13c projects radially inward from the inner peripheral surface of the connection hole 13, and on the opening side, the tapered surface 13f (engaged) decreases in diameter toward the rear side. (Stop portion) is formed.

  As shown in FIG. 1, the bellows tube accommodating portion 13e has a smaller diameter than the sealing material accommodating portion 13d and has the same outer diameter as that of the bellows tube 1a. It is configured so that it can be brought into contact with and housed. The gas hole 12 is opened in the inner wall 13g (wall portion) of the bellows tube housing portion 13e. A ring-shaped fire-resistant expansion packing 3 and a rubber ring-shaped packing 4 (sealing member) are housed in the sealing material housing portion 13d in a press-fitted state. The inner diameter of the packing 4 is smaller than the outer diameter of the bellows tube 1a. An annular groove 4a is formed on the outer periphery of the packing 4.

  The nut 20 is formed of a metal such as brass into a tubular shape, and has an external thread 21 that can be screwed into the internal thread 13a of the joint body 10 on the outer peripheral surface of the intermediate portion in the axial direction. .. A tip portion 22 on one end side (left side in FIG. 1) of the nut 20 has a smaller diameter than the male screw portion 21. A head portion 23 having a diameter larger than that of the male screw portion 21 is formed on the other end side of the nut 20. In the present embodiment, the head has a circular cross section, but it may have a hexagonal cross section. A watertight O-ring 5 is attached to the outer peripheral surface between the male screw portion 21 and the head portion 23 of the nut 20.

  The nut 20 is formed with a through hole 24 for inserting the flexible tube 1 in the axial direction thereof. The through hole 24 is formed with a groove 24a on the other end side in which the T-type watertight packing 6 is mounted. One end side of the through hole 24 is a bellows tube support portion 24b, which is formed to have the same outer diameter as the bellows tube 1a so that the mountain portion 1m of the bellows tube 1a abuts on the inner peripheral surface thereof. ..

  As shown in FIGS. 3 (B) and 5 (B), a flat tip surface 22a is formed on the tip portion 22 of the nut 20, and an annular protruding portion 22b is provided on the inner side in the radial direction. There is. A radially outer portion of the annular protruding portion 22b is a tapered surface 22c whose diameter decreases toward the tip.

  When the nut 20 is screwed into the joint body 10 as shown in FIG. 1, as shown in FIGS. 3 (B) and 5 (B), the inner peripheral surface of the locking tool receiving portion 13b and the locking projection are A space S surrounded by 13c, the outer peripheral surface of the tip portion 22 of the nut 20, the tip surface 22a, and the annular protruding portion 22b is formed. In this space S, a part of the outer circumference of the annular locking member 30 is arranged.

  As shown in FIG. 2, the locking tool 30 is formed by pressing a thin metal plate material, and has an annular base 31 and a plurality of locking pieces integrally formed with the base 31. 32 and 32. The base portion 31 has a seat portion 33 on its inner peripheral portion and an outer peripheral plate portion 34 on its outer peripheral portion. The seat portion 33 has a flat surface, and the outer peripheral plate portion 34 is bent on the outer peripheral side of the seat portion 33 in a direction orthogonal to the flat surface of the seat portion 33 (axial direction of the base portion 31). In this embodiment, the outer peripheral plate portion 34 is bent to the other end side (the right side in FIG. 1) in the longitudinal direction of the joint 2 in a state where the locking tool 30 is attached to the joint 2. The inner diameter of the outer peripheral plate portion 34 is slightly larger than the outer diameter of the tip portion 22 of the nut 20.

  The plurality of locking pieces 32 extend from the inner peripheral side of the seat portion 33 and are arranged along the circumferential direction of the seat portion 33 with a narrow slit 35 interposed therebetween. As shown in FIG. 1, the locking piece 32 is inclined so that the locking piece 30 is attached to the joint 2 so that the locking piece 32 advances radially and inward from the seat portion 33 toward the inner side of the joint 2. There is. Although each locking piece 32 has the same shape and the inclination angle of each locking piece 32 is set to the same angle, the shape and the inclination angle of each locking piece 32 may be different. The diameter of the inscribed circle at the tips of the plurality of locking pieces 32 is formed to be smaller than the outer diameter of the mountain portion 1m of the bellows tube 1a.

Next, a case where the joint body 2 is constituted by the joint body 10, the nut 20, and the locking tool 30 having the above-described configuration will be described.
First, the rubber annular packing 4 and the fireproof expansion packing 3 are fitted in the sealing material housing portion 13d in the joint body 10, the locking tool 30 is put in the coupling body 10, and the outer peripheral plate of the locking tool 30 is inserted. The part 34 is arranged in the catch receiving part 13b. When the nut 20 is screwed into the joint body 10 in this state, the state shown in FIG. 1 is obtained, and the base portion 31 of the locking tool 30 is housed in the space S (FIG. 3 (B)). When the base 31 is accommodated in the space S, the locking tool 30 has its axial direction aligned with the axial direction of the connection hole 13, and the outer peripheral plate portion 34 of the locking tool 30 has radial play. In this state, the outer periphery of the tip 22 of the nut 20 is covered. The locking member 30 can slightly move in the longitudinal direction of the connection hole 13 in the space S, and the seat portion 33 faces or abuts against the tip end surface 22 a of the nut 20.

Next, a process of connecting the flexible pipe 1 to the joint 2 will be described.
As shown in FIG. 1, the flexible pipe 1 in a state in which it is cut at the valley portion 1v of the bellows pipe 1a and the covering pipe 1b for several peaks at the tip is removed is inserted into the through hole 24 from the head 23 side of the nut 20. To insert. Then, the mountain portion 1 m at the tip of the bellows tube 1 a hits the surface of the locking piece 32 of the locking tool 30 and moves the locking tool 30 to the inner side of the connection hole 13. Then, as shown in FIG. 3, the corner portion 36 (the outer peripheral portion of the base portion) formed by the seat portion 33 and the outer peripheral plate portion 34 of the locking tool 30 contacts the tapered surface 13f of the locking projection 13c.
When the ridge 1m at the tip of the bellows tube 1a hits the inclined locking piece 32, radial play is generated between the outer peripheral plate portion 34 of the locking tool 30 and the outer periphery of the tip portion 22 of the nut 20. As a result, the axis of the locking device 30 is aligned with the axis of the bellows tube 1a. Thereby, the insertion load of the flexible tube 1 is reduced, and the flexible tube 1 is easily inserted.

  When the flexible tube 1 is further inserted in this state, the locking piece 32 is expanded by the peak portion 1m of the bellows tube 1a. That is, the locking piece 32 is elastically deformed, and the mountain portion 1 m of the bellows tube 1 a passes through the inner circumference of the locking piece 32. At this time, since the locking piece 32 has elasticity and is inclined, it can be easily pushed and spread, the mountain portion 1m of the bellows tube 1a can easily pass through the locking tool 30, and the flexible tube 1 can be connected to the joint 2. It is easy to insert. In addition, since the corner portion 36 of the locking tool 30 contacts the tapered surface 13f, the locking piece 32 is positioned radially outside as compared with a case where the seat portion 33 inside the corner portion 36 is contacted with a flat surface or the like. Therefore, the flexible tube can be inserted with reduced insertion resistance.

  As shown in FIG. 4, the flexible tube 1 is inserted into the joint 2 by inserting the flexible tube 1 until the tip of the bellows tube 1a contacts the inner wall 13g of the bellows tube housing 13e. At this time, the tip of the locking piece 32 hits the inclined outer peripheral surface of the bellows tube 1a, so that the locking tool 30 locks the flexible tube 1 and is in a retaining state. Further, the annular packing 4 is crushed by the bellows tube 1a and seals between the outer peripheral surface of the bellows tube 1a and the inner peripheral surface of the connection hole 13. The recessed groove 4a of the packing 4 functions as a relief during crushing, and can also be used for adjusting the insertion resistance when the flexible tube 1 passes through the packing 4. Furthermore, the inner peripheral surface of the bellows tube housing portion 13e of the joint body 10 and the inner peripheral surface of the bellows tube support portion 24b of the nut 20 abut the mountain portion 1m of the bellows tube 1a, whereby the flexible pipe 1 is joined. It is supported by 2. That is, by supporting the flexible tube 1 at two points sandwiching the locking tool 30 and the packing 4, the robustness against the bending load applied to the flexible tube 1 is improved, and the locking performance and the sealing performance are improved. Will be maintained.

Next, a case where a force in the direction of withdrawing from the joint 2 acts on the flexible pipe 1 will be described.
As shown in FIG. 5 (A), when a force in the withdrawal direction acts on the flexible tube 1, the locking tool 30 that locks the outer peripheral surface of the bellows tube 1a is slightly moved to the nut 20 side. Then, as shown in FIG. 5 (B), the base end portion and the seat portion 33 of the locking piece 32 of the locking tool 30 contact the tapered surface 22c and the distal end surface 22a of the annular protrusion 22b of the nut 20, respectively. .. As a result, the locking piece 32 is less likely to be deformed inward in the radial direction, and the flexible tube 1 is more difficult to come out of the joint 2.

  When the locking tool 30 locks the flexible tube 1, the tip of the locking piece 32 contacts the inclined outer peripheral surface of the bellows tube 1a. Since a force acts on the flexible tube 1 along the surface thereof, the locking piece 32 can lock the flexible tube 1 with high strength and prevent the flexible tube 1 from coming off.

  In this embodiment, when the bellows tube 1a passes through the locking tool 30 when it is inserted into the joint 2, the outer diameter of the locking tool 30 does not increase, so that the locking tool 30 is inserted into the connection hole 13 of the joint body 10. It is not necessary to form a space such as an annular recess that accommodates the expanded diameter portion. Therefore, the joint body 10 is not increased in size. Further, the locking tool 30 is made smaller in the axial direction by being formed of a metal plate material, and the base portion 31 is bent so that the outer peripheral portion becomes the outer peripheral plate portion 34. Has been converted. As a result, the joint 2 is downsized. Therefore, according to this embodiment, the structure of the locking tool 30 for the flexible pipe joint 2 can be simplified, the manufacturing thereof can be facilitated, and the manufacturing cost can be reduced. As a result, the structure of the flexible pipe joint 2 can be simplified, its manufacture can be facilitated, and the manufacturing cost can be reduced.

  Next, another embodiment of the present invention will be described. It should be noted that, in the following embodiments, only the configurations different from the above-described embodiments will be described, and the same components will be denoted by the same reference numerals and the description thereof will be omitted.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.
The flexible pipe joint 2A shown in FIG. 6 is called a two-touch joint in which the flexible pipe 1 and the joint body 10A are hermetically connected by inserting the flexible pipe 1 and screwing the nut 20A into the joint body 10A. ..

  The connection hole 13 of the joint body 10A is provided with a female screw portion 13a and a bellows tube accommodating portion 13e in order from the opening on the other end side (right side in FIG. 6) toward the back side. The airtight packing 7 is attached to the step portion 13h formed on the inner wall 13g (wall portion) of the bellows tube housing 13e so as to be flush with the inner wall 13g. The airtight packing 7 constitutes a wall portion with which the tip of the bellows tube 1a abuts.

  As shown in FIGS. 6 and 7, a fitting recess 22d is formed in an annular shape on the outer peripheral surface of the tip 22 of the nut 20A. An outer peripheral plate portion 34 of the locking member 30A having an inner diameter slightly larger than the outer diameter of the tip portion 22 is provided with a fitting protrusion 34a annularly protruding in the radial direction and the inward direction. By fitting the fitting convex portion 34a and the fitting concave portion 22d of the nut 20A with each other, the locking tool 30A is connected to the tip portion 22 of the nut 20A with radial play. At this time, the seat portion 33 of the locking tool 30A comes into contact with the tip surface 22a of the nut 20A.

  Next, the case where the joint 2A is configured by the joint body 10A, the nut 20A, and the locking tool 30A having the above-described configurations will be described. First, in the joint body 10A, the airtight packing 7 is attached to the stepped portion 13h, and the nut 20A is connected to the tip 30 of the locking tool 30A. In this state, the nut 20A is screwed into the joint body 10A to a predetermined initial position to form the joint 2A as shown in FIG.

Next, a process of connecting the flexible pipe 1 to the joint 2A will be described.
As a first step, the flexible tube 1 is inserted into the joint 2A shown in FIG. 6, the locking tool 30A is passed through, and the tip of the bellows tube 1a is made airtight in the bellows tube housing portion 13e as shown in FIG. 9A. Abut the packing 7. At this time, the tip of the locking piece 32 abuts on the inclined outer peripheral surface of the bellows tube 1a, so that the locking tool 30A locks the flexible tube 1 and is in a retaining state.

  As the second step, the nut 20A in the initial position is screwed into the joint body 10A. As shown in FIG. 9 (B), the locking piece 32 pushes the mountain portion 1m of the bellows tube 1a, and the tip of the bellows tube 1a is sandwiched between the tip of the locking piece 32 and the airtight packing 7 and pushed. Crush. As a result, the bellows tube 1a and the joint body 10A are in an airtight state, and the connection of the flexible tube 1 to the joint 2A is completed.

  At this time, since the locking tool 30A is connected to the nut 20A with radial play, the locking tool 30A is rotatable with respect to the nut 20A. Therefore, when the locking tool 30A connected to the nut 20A crushes the bellows tube 1a, the locking tool 30A does not rotate together with the nut 20A. Therefore, the bellows tube 1a locked by the locking tool 30A does not rotate together with the nut 20A, and the twisting of the bellows tube 1a can be prevented.

  Further, when the locking tool 30A crushes the bellows tube 1a, the tip of the locking piece 32 contacts the inclined outer peripheral surface of the bellows tube 1a, so that the reaction force from the bellows tube 1a is in the direction along the surface of the locking piece 32. The locking piece 32 can crush the bellows tube 1a with high strength.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
In the first and second embodiments, screwing is used to attach the support member (nut 20, 20A) to the joint body 10, 10A, but in the present embodiment, a stop ring is used instead of screwing. ..

  The flexible pipe joint 2B shown in FIG. 10 is the one-touch joint described above, and the fixed cylinder 20B is attached to the joint body 10B as a support member. A female screw portion is not formed on the inner peripheral surface of the connection hole 13 of the joint body 10B, and the stop ring groove 13i is formed around the entire circumference at a position slightly rearward from the opening on the other end side (right side in FIG. 10). It is formed over.

  The outer diameter of the intermediate portion of the fixed cylinder 20B in the axial direction is formed to be the same as or slightly smaller than the inner diameter of the joint body 10B on the opening side of the connection hole 13. No male screw portion is formed on the outer peripheral surface of the intermediate portion of the fixed barrel 20B, the stop ring groove 25 is formed over the entire circumference, and when the fixed barrel 20B is attached to the joint body 10B, the joint It faces the stop ring groove 13i of the main body 10B.

  The stop ring 8 is attached between the stop ring groove 25 of the fixed barrel 20B and the stop ring groove 13i of the joint body 10B to prevent the fixed barrel 20B from moving in the axial direction. The stop ring 8 is C-shaped, has elasticity and is formed to be expandable / contractible, and is attached in a reduced diameter state from a natural state.

Next, a case will be described in which the joint 2B is configured by the joint body 10B, the fixed barrel 20B, and the locking tool 30 having the above-described configuration.
First, after accommodating the annular packing 4, the fireproof expansion packing 3, and the locking member 30 in the joint body 10B, the stop ring 8 is compressed and fixed in the stop ring groove 25 of the fixed cylinder 20B. The tip 22 of the tube 20B is inserted from the opening of the connection hole 13 of the joint body 10B.

  When the stop ring groove 25 of the fixed barrel 20B and the stop ring groove 13i of the joint body 10B face each other, the stop ring 8 slightly expands to fit in the stop ring groove 13i, and between the stop ring grooves 13i and 25. Will be located. As a result, the fixed barrel 20B is fixed to the joint body 10B while being prevented from moving in the axial direction of the joint body 10B. As a result, the fixed barrel 20B cannot be removed from the joint body 10B.

[Modification]
Next, modified examples of the locking tools 30, 30A according to the present invention will be described. In addition, about the following modified examples, only the structure different from the said locking tools 30 and 30A is demonstrated.

  FIG. 11 is a modified example of the locking tool 30 (FIG. 2) and shows a locking tool 30B as a first modified example. In this locking tool 30B, the base portion 31 is composed only of the seat portion 33 extending in the radial direction.

  FIG. 12 is a modified example of the locking tool 30 and shows a locking tool 30C as a second modified example. In this locking tool 30C, the outer peripheral plate portion 34 is different from the outer peripheral plate portion of the locking tool 30 in the opposite direction, that is, the same direction as the extending direction of the locking piece 32, and the fitting main body at the time of mounting. It is bent to one end side (back side) of 10.

  FIG. 13 is a modified example of the locking tool 30 and shows a locking tool 30D as a third modified example. In this locking tool 30D, a slit 37 extending from the outer peripheral portion of the seat portion 33 to the tip of the outer peripheral plate portion 34 is formed. When the flexible tube 1 is inserted into the back side of the attached locking device 30D, the seat portion 33 tries to fall inward in the radial direction as the locking piece 32 elastically deforms outward in the radial direction. To do. If the slit 37 is not provided, the seat portion 33 is prevented from falling down by the outer peripheral plate portion 34, and a repulsive force acts on the locking piece 32. However, in the locking tool 30D, the repulsive force of the locking piece 32 is weakened due to the formation of the slit 37, the insertion resistance is reduced, and the flexible tube 1 can be inserted into the locking tool 30D.

  FIG. 14 is a modified example of the locking tool 30 and shows a locking tool 30E as a fourth modified example. In this locking tool 30E, relaxation holes 38 are formed between the base ends of the adjacent locking pieces 32 in the seat 33 of the base 31, and a plurality of relaxation holes 38 are arranged along the circumferential direction. In the locking tool 30E, the relaxation hole 38 is formed so that the radial length of the locking piece 32 is substantially lengthened, and the repulsive force acting on the locking piece 32 when the flexible tube 1 is inserted is weakened. Therefore, the insertion resistance can be reduced and the flexible tube 1 can be inserted.

  FIG. 15 is a modified example of the locking tool 30 and shows a locking tool 30F as a fifth modified example. In this locking tool 30F, both the slit 37 and the relaxation hole 38 of the third and fourth modified examples are formed.

  FIG. 16 is a modified example of the locking tool 30A (FIG. 8) and shows a locking tool 30G as a sixth modified example. In this locking tool 30G, a fitting piece 34b extending inward in the radial direction from the tip of the outer peripheral plate portion 34 is formed instead of the fitting convex portion 34a of the outer peripheral plate portion 34 of the locking tool 30A described above. ..

  FIG. 17 shows a modified example of the locking tool 30 (FIG. 2) and shows a state in which a locking tool 30H as a seventh modified example is mounted on the flexible pipe joint 2C. This locking tool 30H is provided on the seat portion 33 of the locking tool 30C (FIG. 12) of the second modified example, similarly to the locking tool 30E of the fourth modified example, in the base end of the adjacent locking piece 32. Relaxation holes 38 are formed between the portions, and a plurality of relaxation holes 38 are arranged along the circumferential direction.

  Similar to the joint 2B (FIG. 10) of the third embodiment, a flexible pipe joint 2C shown in FIG. 17 has a joint body 10C and a fixed cylinder 20C, which is a support member, attached by a stop ring 8. In the fixed cylinder 20B (FIG. 10) of the joint 2B described above, the outer diameter of the distal end portion 22 is formed to be smaller than that of the intermediate portion in order to accommodate the outer peripheral plate portion 34. Since the outer peripheral plate portion 34 of the tool 30H is bent backward, the outer diameter of the tip portion 22 of the fixed cylinder 20C is formed to be the same as the intermediate portion.

  In the flexible pipe joint 2C, when the flexible pipe 1 is connected, the tip of the outer peripheral plate portion 34 of the locking tool 30H contacts the tapered surface 13f of the locking projection 13c.

  The structures of the joint body 10 and the nut 20 are appropriately changed in order to apply the fasteners as the first to seventh modifications. Moreover, you may combine the characteristic of the 1st-7th modification suitably.

  It should be noted that the present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the scope of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a flexible pipe joint in which a bellows-shaped flexible pipe is inserted from a through hole of a support member attached to a joint body, and a locking tool for the joint.

1 Flexible pipe 1m Mountain part 2, 2A, 2B, 2C Flexible pipe joint 4 Packing (annular seal member)
7 Airtight packing (wall)
10, 10A, 10B, 10C Joint body 13 Connection hole 13f Tapered surface (Lock receiving part)
13e Bellows tube housing 13g Back wall (wall)
13h Step (wall)
20,20A nut (support member)
20B, 20C Fixed cylinder (support member)
22 Tip part 22a Tip surface 22b Annular protrusion 22c Tapered surface 24 Through hole 24b Bellows tube support part 30, 30A, 30B, 30C, 30D, 30E, 30F, 30G, 30H Locking tool 31 Base part 32 Locking piece 33 Seat part (base)
34 Peripheral plate part (base part)
36 Corner 37 Slit 38 Relaxation hole

Claims (12)

A flexible pipe having a joint body having a connection hole and a support member having a through hole formed therein and attached to an end of the joint body having the connection hole opened, and a flexible pipe having a bellows shape from the through hole of the support member. A fitting for fitting to a flexible pipe joint inserted into the connection hole,
A ring-shaped base portion formed of a metal material, and a plurality of locking pieces arranged along the circumferential direction of the base portion,
The plurality of locking pieces are arranged on the inner side of the support member in the connection hole of the joint body, and are inclined so as to advance inward in the radial direction from the base toward the inner side of the joint body. Cage,
When the flexible tube is inserted into the joint, the flexible piece is allowed to pass backward by elastically deforming the locking piece, and the tip of the locking piece hits the outer peripheral surface of the flexible tube to be flexible. A locking tool for a flexible pipe joint, which locks a pipe. The annular base portion has a seat portion facing or abutting the tip surface of the support member on the inner peripheral portion, and an outer peripheral plate portion on the outer peripheral portion,
The plurality of locking pieces extend from the inner peripheral side of the seat portion,
The locking tool for a flexible pipe joint according to claim 1, wherein the outer peripheral plate portion is formed by bending the outer peripheral side of the seat portion in a direction intersecting a radial direction of the seat portion. ..   The outer peripheral plate portion of the base portion is bent in the axial direction of the base portion so as to cover the outer periphery of the tip portion of the support member, and there is radial play between the outer peripheral plate portion and the outer periphery of the tip portion. The locking tool for a flexible pipe joint according to claim 2.   The locking for flexible pipe joints according to claim 2 or 3, wherein slits extending from the seat portion to the outer peripheral plate portion are formed in the base portion at a plurality of positions along the circumferential direction. Ingredient   The seat part is provided with a relaxation hole between the base ends of the adjacent locking pieces, and the fitting for a flexible pipe joint according to any one of claims 2 to 4, wherein: Stop. A flexible pipe having a joint body having a connection hole and a support member having a through hole formed therein and attached to an end of the joint body having the connection hole opened, and a flexible pipe having a bellows shape from the through hole of the support member. A flexible pipe joint inserted into the connection hole,
The locking tool according to any one of claims 2 to 5 is mounted in the connection hole,
A taper-shaped lock receiving portion that reduces in diameter toward the back is formed on the inner side of the base of the locking tool in the connection hole of the joint body, and the base of the locking tool is formed in the lock receiving section. A flexible pipe joint, wherein the outer peripheral portion of the joint can contact. A flexible pipe having a joint body having a connection hole and a support member having a through hole formed therein and attached to an end of the joint body having the connection hole opened, and a flexible pipe having a bellows shape from the through hole of the support member. A flexible pipe joint inserted into the connection hole,
The locking tool according to any one of claims 2 to 5 is mounted in the connection hole,
On the inner peripheral side of the tip surface of the support member, an annular protrusion extending toward the inner side of the joint body is provided, and the radially outer portion of the annular protrusion is on the inner side of the joint body. A joint for a flexible pipe, characterized in that it has a taper surface that decreases in diameter toward the tip end surface, and that the locking piece and the seat portion of the locking tool can contact the tapered surface and the tip end surface, respectively. The flexible pipe joint according to claim 6,
On the inner peripheral side of the tip surface of the support member, an annular protrusion extending toward the inner side of the joint body is provided, and the radially outer portion of the annular protrusion is on the inner side of the joint body. A joint for a flexible pipe, characterized in that it has a taper surface that decreases in diameter toward the tip end surface, and that the locking piece and the seat portion of the locking tool can contact the tapered surface and the tip end surface, respectively. A flexible pipe having a joint body having a connection hole and a support member having a through hole formed therein and attached to an end of the joint body having the connection hole opened, and a flexible pipe having a bellows shape from the through hole of the support member. A flexible pipe joint inserted into the connection hole,
The locking tool according to any one of claims 1 to 5 is mounted in the connection hole,
When the flexible tube is inserted into the connection hole from the through hole of the support member and locked by the locking tool, the mountain portion of the flexible tube is connected to the connection hole on the back side of the locking piece of the locking tool. The flexible pipe joint is characterized in that the flexible pipe is supported by contacting the inner peripheral surface of the flexible pipe with the inner peripheral surface of the through hole of the support member on the front side of the locking piece. The flexible pipe joint according to any one of claims 6 to 8,
When the flexible tube is inserted into the connection hole from the through hole of the support member and locked by the locking tool, the mountain portion of the flexible tube is connected to the connection hole on the back side of the locking piece of the locking tool. The flexible pipe joint is characterized in that the flexible pipe is supported by contacting the inner peripheral surface of the flexible pipe with the inner peripheral surface of the through hole of the support member on the front side of the locking piece. A flexible pipe having a joint body having a connection hole and a support member having a through hole formed therein and attached to an end of the joint body having the connection hole opened, and a flexible pipe having a bellows shape from the through hole of the support member. A flexible pipe joint inserted into the connection hole,
The locking tool according to any one of claims 1 to 5 is mounted in the connection hole,
The support member is attached to the connection hole of the joint body by screwing,
In the connection hole of the joint body, a wall portion is formed on which the tip of the flexible pipe abuts on the far side from the locking tool,
The flexible tube is inserted into the connection hole from the through hole of the support member, abuts against the wall portion, and is locked by the locking tool, with the support member facing toward the back side of the connection hole. By being screwed, the flexible pipe on the inner side of the locking tool is crushed by the locking piece and the wall portion, and the flexible pipe is connected to the joint body in an airtight state. Pipe fittings. The flexible pipe joint according to claim 7,
The support member is attached to the connection hole of the joint body by screwing,
In the connection hole of the joint body, a wall portion is formed on which the tip of the flexible pipe abuts on the far side from the locking tool,
The flexible tube is inserted into the connection hole from the through hole of the support member, abuts against the wall portion, and is locked by the locking tool, with the support member facing toward the back side of the connection hole. By being screwed, the flexible pipe on the inner side of the locking tool is crushed by the locking piece and the wall portion, and the flexible pipe is connected to the joint body in an airtight state. Pipe fittings.

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