WO2014142226A1

WO2014142226A1 - Tube-fastening structure

Info

Publication number: WO2014142226A1
Application number: PCT/JP2014/056621
Authority: WO
Inventors: 伸二瀧本
Original assignee: 株式会社トヨックス
Priority date: 2013-03-13
Filing date: 2014-03-13
Publication date: 2014-09-18
Also published as: TW201447158A; TWI573948B; JP5641552B1; CN105074308B; HK1213036A1; JPWO2014142226A1; MY172693A; SG11201506993TA; CN105074308A

Abstract

The present invention prevents marring of the outer surface of a tube while reliably preventing pull-out with a simple structure regardless of diameter-constricting deformation of the tube. Even if the clip body (2) is moved along the outer surface (A1) of a tube (A) into which a nipple (1) is inserted, the tip surface (41d) of a bent section (41) does not strike the outer surface (A1) of the tube (A). The clip body (2), with the diameter expanded using manipulator parts (3) thereof, is moved toward a locking flange (12) of the nipple (1). When the bent section (41) of the hook (4) rides over the locking flange (12) in the axial direction, the diameter of the clip body (2) undergoes diameter-constricting deformation elastically by releasing the diameter expansion of the clip body using the operating parts (3) and as a result, the tip surface (41d) of the bent section (41) enters an engaging groove (13) of the nipple (1). At the same time, the bent section (41) engages with the locking flange (12) in the axial direction and becomes immovable. Even if subsequently the clip body (2) digs into the outer surface (A1) of the tube (A) or the tube (A) undergoes diameter-constricting deformation in association with aged deterioration, the bent section (41) moves radially inward along the locking flange (12) and the engagement of the two is maintained.

Description

Pipe fastening structure

The present invention relates to a tube fastening structure that prevents an elastically deformable tube body such as a hose or a tube from coming off with a clip.

Conventionally, as this type of pipe fastening structure, a circular fastening part capable of fastening the hose from the outer periphery to a clip for fastening the hose fitted on one end of the pipe by reducing the diameter from the outer circumference, and circular fastening L-shaped hooks extending in the axial direction and extending in the circumferential direction from the axial end of the part are integrally provided, and the flare nut provided in the pipe is provided with an L-shaped notch, and the L-shaped notch Some hooks are engaged with each other so as not to move in the axial direction by inserting the hook into an L-shaped notch in the axial direction and then rotating in the circumferential direction (see, for example, Patent Document 1).
Also, a clamp part obtained by bending a long strip-shaped plate material into a C-shape, an engagement part (engagement hole, convex rib, concave groove) formed adjacent to the clamp part, and a pipe into which a hose is inserted Provided with an engaged portion (engagement protrusion, recessed groove, protruding rib) provided on the outer peripheral surface adjacent to the tip of the hose, and the engaging portion of the clamp portion from the radially outer side to the engaged portion of the pipe In some cases, the engaging portion and the engaged portion are unevenly fitted in the radial direction of the hose by engaging with each other (see, for example, Patent Document 2).

JP 2010-169175 A JP 2006-57798 A

In the first place, flexible hoses and tubes formed of elastic materials such as synthetic resin and rubber have a tendency to cause dimensional errors in the inner diameter, outer diameter, and wall thickness at the time of manufacture. When tightened from the outer periphery, the elastic material at the tightened portion is compressed and deformed, and the clip or the like bites into it. The elastic material that has been compressed and deformed by this biting has the property that it escapes to a place adjacent to the tightening part and rises and deforms, the property that the wall thickness decreases with long-term use, and the outer surface is slightly deformed. It has the property of being easily ruptured due to scratching.
However, in such a conventional pipe fastening structure, in the case of Patent Document 1, since the L-shaped hook and the L-shaped notch are rotatably engaged in the circumferential direction, the hose is in use. When the is rotated and twisted, the L-shaped hook is displaced in the circumferential direction together with the hose, and the engagement with the L-shaped notch is easily released.
In particular, when the L-shaped hook is not sufficiently rotated by the operator in the circumferential direction and is not completely engaged with the L-shaped notch, the L-shaped hook is more easily detached from the L-shaped notch. Become. When the hose is pulled in this state, the hose is pulled out together with the clip from the pipe, and there is a problem that the pulling strength is lowered.
Further, in the case of Patent Document 2, even if the clamp part is bitten into the outer peripheral surface of the hose as the clamp part is tightened or the clamp part is further reduced in diameter due to the shrinkage deformation due to the secular change of the hose, the engagement part Is supported by the engaged part and is difficult to move radially inward, so the clamp part cannot be smoothly reduced in diameter, thereby causing a gap between the outer peripheral surface of the hose and the inner peripheral surface of the clamp part. And tightening force is reduced.
In particular, when a hose having an outer diameter smaller than the standard size is used due to a manufacturing error, a gap is more likely to occur between the outer peripheral surface of the hose and the inner peripheral surface of the clamp portion. When the hose is pulled in this state, the hose is pulled out from between the clamp part and the pipe, and there is a problem that the pulling strength is lowered.
Furthermore, in the case of Patent Document 2, if the elastic material that has digged into the outer peripheral surface of the hose as it is tightened by the clamp part escapes to a place adjacent to the tightened part and rises and deforms, the clamp part is inclined overall. There is also a problem that the engaging portion is easily detached from the engaged portion.

An object of the present invention is to cope with such a problem, and reliably prevents the tubular body from coming off regardless of the diameter reduction deformation of the tubular body while preventing damage to the outer surface of the tubular body. The purpose is to do.

In order to achieve such an object, the present invention includes a nipple inserted into an elastically deformable tube, a clip body that is elastically deformable in a radial direction and clamps the tube between the nipple, An operating portion for elastic deformation provided in the clip body and a hook provided so as to protrude from the clip body, and the nipple is provided at an insertion portion to be inserted into the tube body and at an end of the insertion portion. And an engaging groove provided on the opposite side of the insertion portion across the locking rod, and the hook is adapted to deform the locking rod along with the radial deformation of the clip body. A bending portion that extends in an axial direction, and a distal end surface of the bending portion is disposed on an axial extension line of an inner peripheral surface of the clip body, and is radially between the locking rod and the engaging groove Opposite across the space Characterized in that it is urchin arranged.

In the present invention having the above-described features, even if the clip main body is moved along the outer surface of the tubular body in which the nipple is inserted, the distal end surface of the bent portion does not hit the outer surface of the tubular body. While the clip body is expanded and deformed at the operation part, it moves toward the locking nipple of the nipple, and after the bent part of the hook gets over the locking hook in the axial direction, the clip body is released from the enlarged diameter at the operation part. As a result, the clip body is elastically contracted to reduce its diameter, and at the same time, the distal end surface of the bent portion enters the engaging groove of the nipple, and at the same time, the bent portion engages with the locking rod and moves in the axial direction. It becomes impossible. After that, even if the tube body shrinks due to the bite of the clip body against the outer surface of the tube body or secular change, the bent part moves radially inward along the locking rod and the engagement state of both is maintained. Is done.
Therefore, it is possible to reliably prevent the tube body from coming off regardless of the diameter reduction deformation of the tube body with a simple structure while preventing the outer surface of the tube body from being damaged.
As a result, the L-shaped hook and the L-shaped notch are engaged with each other so as to be rotatable in the circumferential direction, or even if the clamp portion is about to undergo diameter reduction deformation as the hose diameter changes. The joint part is supported by the engaged part and difficult to move inward in the radial direction, and when the part adjacent to the tightening part on the outer peripheral surface of the hose rises and deforms due to tightening by the clamp part, the clamp part tilts and engages Compared to the conventional one in which the portion is easily disengaged from the engaged portion, it is possible to maintain an excellent pullout strength over a long period of time and to prevent an accident due to the tube being pulled out.

It is explanatory drawing which shows the whole structure of the pipe fastening structure which concerns on embodiment of this invention, (a) is a front view, (b) is a vertical side surface which follows the (1B)-(1B) line | wire of Fig.1 (a) FIG. 4C is a longitudinal front view taken along the line (1C)-(1C) in FIG. It is a perspective view of a disassembled state, (a) is a perspective view of the whole, (b) is a perspective view of the clip seen from the reverse direction, (c) is a perspective view showing an expanded state of the clip, (d) is a clip It is the perspective view seen from the reverse direction in the diameter expansion state. It is the perspective view and side view which show the connection process of the pipe body with respect to a nipple, (a) is a perspective view before inserting a nipple in a pipe body, (b) is a side view of the same state, (c) is a pipe body A perspective view after inserting a nipple, (d) is a side view of the same state, (e) is a perspective view after rotating a clip, and (f) is a side view of the same state. It is a perspective view which expands and shows the modification of a clip. It is an expansion perspective view which expands and shows other modifications of a clip. It is a vertical front view which shows the modification of a nipple. It is a vertical front view which shows the other modification of a nipple.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
As shown in FIGS. 1 to 5, the pipe fastening structure according to the embodiment of the present invention inserts the nipple 1 of the joint B into the connection end of the pipe body A, and then uses the clip C to connect the pipe to the nipple 1. The connection end of the body A is prevented from coming off.
That is, after the joint B is inserted into the tube A, the tube A is fastened (coupled) to the nipple 1 with the clip C so that the tube A cannot be moved in the removal direction F.
More specifically, the pipe fastening structure according to the embodiment of the present invention is in the radial direction in which the pipe body A is sandwiched and tightened between the nipple 1 of the joint B inserted into the elastically deformable pipe body A and the nipple 1. The clip main body 2 of the clip C which can be elastically deformed, the operation part 3 for elastic deformation provided in the clip main body 2, and the hook 4 provided protruding from the clip main body 2 are provided as main components.

The tube A is, for example, a hose or a tube formed of a flexible soft material such as vinyl chloride or a flexible soft material such as silicone rubber or other rubber, and the outer surface A1 and the inner surface A2 thereof are A flat one is preferred.
As a specific example of the tube A, as shown in FIGS. 1 to 3, a hose having a single layer structure is used.
Although not shown as another example, a laminated hose in which a plurality or a single synthetic resin blade (reinforcing yarn) is embedded in a spiral as an intermediate layer between the transparent or opaque outer layer and inner layer. (Blade hose), a spiral reinforcing hose (forlan hose) in which a belt-like reinforcing material such as a synthetic resin or metal cross-sectional rectangle and a linear reinforcing material such as a circular cross-section are spirally wound and integrated as an intermediate layer It is also possible to use a spiral reinforcing hose in which a metal wire or a hard synthetic resin wire is embedded in a spiral shape.

The joint B has a nipple 1 on one end side in the axial direction.
The nipple 1 is made of a non-deformable rigid material such as a metal such as brass or a hard synthetic resin, and is formed in a substantially cylindrical shape having an outer diameter substantially the same as the inner diameter of the tube A, or deformable such as stainless steel. A plate material made of a rigid material is formed into a thin cylindrical shape by pressing or other forming process.
Further, on the outer peripheral surface of the nipple 1, an insertion portion 11 inserted into the connection end portion of the tube body A, a locking rod 12 formed at the end of the insertion portion 11, and an insertion portion sandwiching the locking rod 12 11 and an engagement groove 13 provided on the opposite side in the axial direction (insertion direction G opposite to the withdrawal direction F).
The locking rod 12 protrudes in the radial direction on the outer peripheral surface of the nipple 1 and has an annular shape, and has a notch portion 12a through which a bent portion 41 (second flange side surface 12d) of the hook 4 described later can pass in the axial direction. Is preferred. As shown in FIGS. 1 to 3, the notch 12 a is preferably formed in a concave shape so that the bottom surface thereof is disposed shallower than the depth of the inner bottom surface of the engagement groove 13. Although not shown in the drawings as another example, the bottom surface of the cutout portion 12a may be formed in a concave shape so as to be shallower than the illustrated example, or the cutout portion 12a may not be formed in a concave shape.
Furthermore, it is preferable that at least one or more (single or plural) concave portions 12a are formed in the circumferential direction of the locking rod 12 in the notch 12a.
The engaging groove 13 is formed in the circumferential direction so as to be adjacent to the locking rod 12, and is set deeper than the protruding amount of the locking rod 12 and shallower than the outer peripheral surface of the nipple 1.

The clip C includes at least one clip body 2 disposed so as to cover the outer periphery of the connection end of the tube body A, an operation unit 3 for elastically deforming the clip body 2, and one end in the axial direction of the clip body 2. The hook 4 provided as described above (single or plural).
The clip body 2 is formed by bending an annular material made of a metal having excellent elastic repulsion such as spring steel or other elastic material into an annular shape, and has an inner peripheral surface 2a that can be elastically deformed in the radial direction. is doing.
An operation portion 3 is provided at both ends or one end in the circumferential direction of the band-shaped material that is bent into an annular shape to become the clip body 2, and the operation portion 3 is moved in the circumferential direction against the spring force of the clip body 2. The annular belt-like material is elastically deformed in the radial direction to increase the inner diameter of the clip body 2.
In the example shown in FIGS. 1 to 3, the clip body 2 and the hook 4 are integrally formed so that the hook 4 can be elastically deformed.
Although not shown as another example, the clip body 2 and the hook 4 may be formed separately and integrated by welding or fixing them. Also in this case, the hook 4 is preferably formed of a material that can be elastically deformed.

When the diameter of the clip body 2 is reduced when the operation portion 3 is not moved, the nipple 1 is inserted as shown in FIGS. 2 (a), 2 (b) and 3 (a), 3 (b). It is set to be substantially the same as or slightly smaller than the outer diameter of the tube A in the initial state. As shown in FIGS. 1A to 1C and FIGS. 3E and 3F, in the connected state in which the nipple 1 is arranged so as to cover the outer periphery of the inserted tube A, the tube A It is set to be smaller than the outer diameter, and the connecting end portion of the tube body A is sandwiched in the radial direction between the insertion portion 11 and elastically tightened.
Further, when the diameter of the operation unit 3 is increased in the circumferential direction, as shown in FIGS. 2C and 2D and FIGS. 3C and 3D, the nipple 1 is inserted into the clip body 2 in the inner diameter. Not only the outer diameter of the tube body A in the initial state, but also the outer diameter of the tube body A into which the nipple 1 is inserted is set. As a result, a gap is formed between the inner peripheral surface 2a of the clip body 2 and the outer surface A1 of the tube A in which the nipple 1 is inserted, and the clip is applied to the outer surface A1 of the tube A in which the nipple 1 is inserted. The C clip body 2 can be freely moved in the axial direction and in the circumferential direction.

As a specific example of the clip C, as shown in FIGS. 1 to 5, a pair of operation portions 3 that are bent at both ends in the circumferential direction of the ring-shaped material that is bent into an annular shape to become the clip body 2, and the belt-shaped material A through hole 2b formed from one circumferential end to one operating portion 3, and the other circumferential end of the belt-like material can be moved in the circumferential direction within the through hole 2b continuously with the other operating portion 3. The movable part 2c is formed.
When the diameter of the operation unit 3 is reduced due to non-operation, as shown in FIGS. 2A and 2B and FIGS. 3A and 3B, the through hole 2b and the movable unit 2c overlap in the axial direction, The operation units 3 are arranged so as to be separated from each other. As shown in FIGS. 2 (c) (d) and 3 (c) (d), the two operating parts 3 are moved closer to each other with a tool or a finger to move the movable part within the through hole 2b. 2c moves smoothly, the amount of overlap with the through-hole 2b decreases, and the diameter is increased. Further, by releasing the knob of the operation unit 3 from this expanded diameter state, the diameter of the clip body 2 is reduced and deformed by the spring force.
Although not shown in the drawings as other examples, the operation unit 3 may be formed only at one end in the longitudinal direction of the belt-shaped material to be the clip body 2, or the shape of the through hole 2b, the movable unit 2c, or the operation unit 3 may be changed. Is also possible.

One or a plurality of hooks 4 are integrally formed or fixed integrally so as to protrude in a part in the circumferential direction at one end in the axial direction of the clip body 2 in the axial direction and the radial direction. The hook 4 has a bent portion 41 that extends in the radial direction along the locking rod 12 of the nipple 1 and can ride over the locking rod 12 in the axial direction along with the radial deformation of the clip body 2. Yes.
The bent portion 41 includes a first protrusion 41a extending radially outward along the first flange side surface 12b of the locking rod 12, and an axis along the outer surface 12c of the locking rod 12 from the tip of the first protrusion 41a. A cylindrical portion 41b extending in the direction, and a second protrusion 41c extending radially inward from the tip of the cylindrical portion 41b toward the engagement groove 13 of the nipple 1 along the second flange side surface 12d of the locking rod 12. have.
The second protrusion 41c of the bent portion 41 causes the locking rod 12 to move in the axial direction along with the movement in the axial direction with respect to the outer surface A1 of the tubular body A into which the nipple 1 has been inserted due to the diameter expansion deformation of the clip body 2. It is set so as to get into the engaging groove 13 as the clip main body 2 is reduced in diameter after the ride.

Furthermore, the second protrusion 41 c of the bent portion 41 has a tip surface 41 d that faces the inner bottom surface of the engagement groove 13 of the nipple 1 in the radial direction. The distal end surface 41d of the second protrusion 41c is connected to the engagement rod 12 and the engagement groove 13 in a state where the second protrusion 41c enters the engagement groove 13 of the nipple 1 as the clip body 2 is reduced in diameter. Are arranged so as to face each other across the space portion S in the radial direction.
In the example shown in FIGS. 2 (a) to 2 (d), the tip surface 41d of the second protrusion 41c is arranged substantially in the same axial direction as the inner peripheral surface 2a of the clip body 2.
Further, although not shown as another example, it is also possible to dispose the tip end surface 41d of the second protrusion 41c in a concave shape radially outward from the axial extension line of the inner peripheral surface 2a of the clip body 2.
The space portion S includes a first space S1 that is defined between the tubular portion 41b of the bent portion 41 and the outer surface 12c of the locking rod 12, and the second projecting portion 41c of the bent portion 41 and the engaging groove 13. It consists of 2nd space S2 dividedly formed between the inner bottom face. When the pipe body A clamped between the clip body 2 and the insertion portion 11 of the nipple 1 is reduced in diameter, the tubular portion 41b of the bent portion 41 is linked to the outer surface 12c of the locking rod 12 in conjunction with the deformation. At the same time, the second protrusion 41c of the bent portion 41 approaches the inner bottom surface of the engagement groove 13, and the second protrusion 41c of the bent portion 41 extends along the second flange side surface 12d of the locking rod 12. Thus, it can be moved radially inward.
Further, in the bent portion 41, a rotation space 41e wider in the axial direction than the locking rod 12 of the nipple 1 is formed between the first protrusion 41a and the second protrusion 41c, and the second protrusion 41c is engaged. It is preferable to rotationally move along the second flange side surface 12 d of the stop rod 12 and the engagement groove 13.

And in the pipe fastening structure which concerns on embodiment of this invention, the connection method of the pipe body A with respect to the joint B is demonstrated according to process order.
First, in the initial state shown in FIG. 3A, the tube body A is inserted through the clip body 2 of the clip C, and then the nipple 1 of the joint B is inserted into the connection end of the tube body A. In the example shown in FIG. 3A, the connecting end of the tube A is pushed in the insertion direction G with respect to the nipple 1 of the joint B.
In this initial state, as shown in FIG. 3B, the clip main body 2 is reduced in diameter because the operation portion 3 of the clip C is not moved. At this time, when the inner diameter of the clip body 2 is set to be substantially the same as the outer diameter of the tube body A, the inner peripheral surface 2a of the clip body 2 slides along the outer surface A1 of the tube body A. Smooth insertion of C becomes possible.
Further, when the inner diameter of the clip body 2 is set to be slightly smaller than the outer diameter of the tube A, the clip body 2 is expanded and deformed by moving the operating portion 3 of the clip C closer, Since a gap is generated between the inner peripheral surface 2a of the clip main body 2 and the distal end surface 41d of the bent portion 41 and the outer surface A1 of the tubular body A, the clip C can be smoothly inserted.

Next, as shown in FIGS. 3 (c) and 3 (d), the clip body 2 and the hook 4 are connected to the locking rod 12 of the nipple 1 while the clip body 2 is enlarged and deformed by the operation portion 3 of the clip C. By moving in the insertion direction G so as to approach, the bent portion 41 (second protrusion 41c) of the hook 4 gets over the locking rod 12 in the axial direction.
In the illustrated example, the tip end surface 41d of the second protrusion 41c that is arranged substantially in the same axial direction as the inner peripheral surface 2a of the clip body 2 is moved in the insertion direction G so as to come into contact with the bottom surface of the notch 12a. It is configured so as to pass smoothly in the axial direction and easily over the locking rod 12.
Although not shown in the drawings as another example, the tip of the second protrusion 41c can be obtained by partially elastically deforming the entire hook 4 or at least the bent part 41 (second protrusion 41c) and moving it in the insertion direction G. The surface 41d may be changed so that the bent portion 41 (second projecting portion 41c) of the hook 4 rides over the locking rod 12 in the axial direction beyond the bottom surface of the notched portion 12a formed shallower and concave than the illustrated example. Is possible.
If the deformation amount of the clip body or the hook 4 is large, the notch 12a does not have to be formed in a concave shape.

With this movement, after the bent portion 41 of the hook 4 gets over the locking rod 12 in the insertion direction G, the operating portion 3 is moved backward as shown in FIGS. When the diameter expansion deformation of 2 is released, the clip main body 2 is elastically contracted to reduce the diameter, and the connection end of the tube A is sandwiched between the nipple 1 of the joint B and tightened.
At the same time, the front end surface 41 d of the bent portion 41 enters the engagement groove 13 of the nipple 1.
As a result, the second protrusion 41c of the bent portion 41 engages with the second flange side surface 12d of the locking rod 12 in the removal direction F and becomes immovable. Therefore, the connection end portion of the pipe body A is prevented from coming off by the clip C with respect to the nipple 1 of the joint B, and the pipe body A is securely connected to the joint B.

According to such a pipe fastening structure according to the embodiment of the present invention, in the preparation step of setting the clip C to the connection end portion of the pipe body A in which the nipple 1 of the joint B is inserted, the outer surface of the pipe body A Even if the clip body 2 is moved in the insertion direction G along A1, the distal end surface 41d of the bent portion 41 does not hit the outer surface A1 of the tube A. Therefore, the outer surface A1 of the tubular body A can be prevented from being damaged.
Next, the clip body 2 is moved toward the locking rod 12 of the nipple 1 while the diameter of the clip body 2 is deformed by the operation portion 3, and the bent portion 41 of the hook 4 gets over the locking rod 12 in the insertion direction G. Then, the diameter expansion of the clip body 2 is canceled by the operation unit 3. As a result, the clip body 2 is elastically deformed and reduced in diameter, and the distal end surface 41 d of the bent portion 41 enters the engaging groove 13 of the nipple 1 by using the clip body 2. At the same time, the bent portion 41 (the second protrusion 41c) engages with the locking rod 12 (the second flange side surface 12d) in the axial direction and becomes immovable.
After the connection end of the tube A is connected and fixed to the joint B with the clip C, the connection end of the tube A is reduced in diameter as the clip body 2 bites into the outer surface A1 of the tube A and changes over time. Even if it deform | transforms, the 2nd projection part 41c of the bending part 41 moves to radial inside along the 2nd collar side surface 12d of the latching rod 12, and both engagement state is maintained.
Accordingly, it is possible to reliably prevent the tubular body A from coming off regardless of the diameter reduction deformation at the connection end portion.
Therefore, excellent pullout strength can be maintained over a long period of time, and an accident caused by the tube A coming off can be prevented.

In particular, as shown in the figure, the locking rod 12 of the nipple 1 has a notch 12a through which the bent portion 41 of the hook 4 can pass in the axial direction, and the bent portion 41 rotates wider than the locking rod 12. When the working space 41e is provided, as shown in FIG. 3C, the bent portion 41 (second projecting portion 41c) of the hook 4 is passed in the axial direction along the notch 12a of the locking rod 12. Accordingly, the bent portion 41 (second projecting portion 41c) rides over the locking rod 12 in the axial direction.
Further, when the notch 12a is formed in a concave shape that is shallower than the depth of the engaging groove 13, the hook C can be operated without forcibly moving the operating portion 3 of the clip C and expanding the clip body 2 more than necessary. 4 bent portions 41 (second projecting portions 41 c) get over the locking rod 12. When the knob of the operation portion 3 is released at this point, the tip end surface of the bent portion 41 can be obtained without rotating the hook 4 along the locking rod 12 (second rib side surface 12d) in accordance with the rotation operation of the clip body 2. 41d enters the engaging groove 13 of the nipple 1 and the bent portion 41 (second protrusion 41c) engages with the locking rod 12 (second rod side surface 12d) in the axial direction and becomes immovable.
Therefore, even if the diameter expansion deformation amount of the clip main body 2 by the operation portion 3 is small, it can be securely engaged with the locking rod 12 without coming off.
Thereafter, as shown in FIG. 3 (e), the clip body 2 is further rotated to rotate the hook 4 along the locking rod 12 (second rib side surface 12d), and the bent portion 41 (second protrusion). It is preferable to move the portion 41c) to a location where the notch 12a is not present in the locking rod 12 (second flange side surface 12d).
In this case, the bent portion 41 (second projecting portion 41c) is more reliably engaged with the locking rod 12 (second flange side surface 12d) in the axial direction, thereby improving the integrity.
In addition, when the hook 4 is configured such that the tip surface 41d of the second protrusion 41c is disposed in a concave shape radially outward from the axial extension line of the inner peripheral surface 2a of the clip body 2, The tip end surface 41d of the protrusion 41c and the outer surface A1 of the tube A are further separated.
Thereby, it is possible to reliably prevent the outer surface A1 of the tubular body A from being damaged by the tip surface 41d of the second protrusion 41c.
In addition, when the bent part 41 (second protrusion 41c) of the hook 4 gets over the locking rod 12 by the entire or partial elastic deformation of the hook 4, as shown in FIG. 3 (e). Furthermore, there is no need to further rotate the clip body 2.

Next, each embodiment of the present invention will be described with reference to the drawings.
In the first embodiment, as shown in FIGS. 1 to 3, in the insertion portion 11 of the nipple 1, the end portion 2d of the clip body 2 positioned in the axial direction by the hook 4 with respect to the locking rod 12 and the radial direction. An annular recess 11a that fits in the radial direction with the tubular body A fastened by the clip body 2 is provided in a circumferential direction at a position facing the tubular body A.

In the example shown in FIGS. 1 to 3, a plurality of annular recesses 11 a are formed in the insertion portion 11, and one of the annular recesses 11 a and the clip body 2 on the opposite side of the hook 4 in the direction F of the tube A is removed. The end 2d disposed at the end is disposed so as to face the radial direction.
More specifically, a plurality (a pair) of concave grooves 11b are formed as the annular concave portions 11a at predetermined intervals in the axial direction, and the first of the concave grooves 11b arranged in the pulling direction F of the tubular body A most. An end edge as the end portion 2d of the clip body 2 is disposed so as to face the step portion 11c in the radial direction.
Further, the first step portion 11c arranged in the recessing direction F of the tubular body A most in the concave groove 11b is raised substantially perpendicular to the radial direction from the inner bottom surface of the concave groove 11b. In these concave grooves 11b, the second step portions 11d disposed in the opposite direction to the pulling-out direction F, that is, in the insertion direction G of the tubular body A with respect to the nipple 1, gradually move from the inner bottom surface of the concave groove 11b toward the insertion direction G. Inclined to expand the diameter.
As a result, the tube body A is tightened toward the insertion portion 11 by the clip body 2 including the movable portion 2c, and elastically deforms along the annular recess 11a, so that the inner surface A2 of the tube body A is fitted with the annular recess 11a. Thus, the end portion 2d of the clip body 2 opposite to the hook 4 and the first step portion 11c of the groove 11b are engaged in the axial direction.
Although not shown in the drawings as another example, one or more annular recesses 11a are formed in the insertion portion 11, and these step portions are arranged so as to face the end portion 2d of the clip body 2 in the radial direction. It is also possible.

According to such a pipe fastening structure according to the first embodiment of the present invention, the clip body 2 positioned in the axial direction by the hook 4 with respect to the locking rod 12 of the nipple 1 is elastically reduced in diameter and deformed. 2 end 2d fits in the radial direction with the annular recess 11a (first step portion 11c) of the insertion portion 11 across the tube A, so that the axis of the inner surface A2 of the tube A with respect to the insertion portion 11 of the nipple 1 The frictional resistance in the direction is further increased.
Accordingly, it is possible to make it difficult for the tube body A to be removed from the nipple 1.
As a result, there is an advantage that the pull-out strength of the tubular body A with respect to the nipple 1 can be further improved.

In particular, in the example shown in FIGS. 1 to 3, the engagement hole 2 e is penetrated and opened separately from the through hole 2 b in the band-shaped material that becomes the clip body 2.
The engagement hole 2e is disposed so that a part of the hole edge faces the first step portion 11c, which is raised substantially perpendicular to the radial direction from the inner bottom surface of the groove 11b, with the tube body A interposed therebetween. .
The shape of the engagement hole 2e is not limited to the illustrated example, and can be changed.
As a result, the engagement hole 2e is tightened by tightening the clip body 2 against the outer surface A1 of the tube A into which the nipple 1 is inserted, as shown in FIGS. 1 (a) to 1 (c) and FIGS. 3 (e) and (f). The edge of the hole bites into and increases the frictional resistance between the outer surface A1 and the clip body 2, and at the same time, part of the edge of the engagement hole 2e sandwiches the tube body A and the first step portion 11c of the annular recess 11a. Therefore, the frictional resistance in the axial direction of the inner surface A2 of the tubular body A with respect to the insertion portion 11 of the nipple 1 is further increased.
As another example, as shown in FIG. 4, the engagement hole 2e may not be provided.

Further, in the example shown in FIGS. 1 to 3, a tool engaging portion 14 that engages a tool (not shown) such as a spanner or a wrench on the other end side in the axial direction than the engaging groove 13 in the nipple 1. The connecting portions 15 for connecting to other pipe connection ports (not shown) made of different devices or different pipe bodies are integrally formed.
A hex nut is formed as the tool engaging portion 14.
When the internal thread is engraved on the inner peripheral surface of the pipe connection port in other equipment or other pipes connected to the joint B, the connection portion 15 is engraved with an external screw corresponding thereto, When an external screw is engraved on the outer peripheral surface of the pipe connection port, an internal screw corresponding to this is engraved. In the illustrated example, an external screw is engraved as the connecting portion 15.
Although not shown as another example, the nipple 1 and the joint B can be formed separately, and the nipple 1 and the joint B can be detachably attached.

Furthermore, by connecting the nipple 1 of the joint B with another device or another pipe body by the connecting portion 15, it is also possible to electrically connect them.
In particular, when the clip body 2 and the hook 4 of the joint B and the clip C are formed of a conductive material such as metal, the clip that contacts the outer surface A1 of the pipe body A in the connected state of the pipe body A and the joint B. Since the hook 4 of the main body 2 is in contact with the locking rod 12 of the nipple 1, the outer surface A1 of the tube body A is electrically connected to the nipple 1 or other equipment or other tube body via the clip body 2. It becomes a communication state.
In addition, in order to remove static electricity generated by the transfer of fluid passing through the tube A, when the conductive portion or outermost layer made of a conductive material is provided on the outer surface A1 of the tube A, the transfer of the fluid The generated static electricity can be grounded from the outer surface A1 of the tube A to the nipple 1 side through the clip body 2. Thereby, the pipe fastening structure excellent in safety can be provided.

When the connecting portion 15 is connected to another pipe connection port with a screw, depending on the screwing state of the connecting portion 15, the notch portion 12a of the locking rod 12 may be disposed at an angle that is difficult to be seen by the operator. is there.
Therefore, in the illustrated example, a plurality (a pair) of notches 12a are formed in the locking rod 12 at predetermined intervals in the circumferential direction.
Although not shown as another example, it is possible to form three or more notches 12a in the locking rod 12 at predetermined intervals in the circumferential direction.

In the second embodiment, as shown in FIG. 5, a plurality of hooks 4 are provided at one end in the axial direction of the clip body 2 at predetermined intervals in the circumferential direction. Alternatively, a configuration in which a larger number of notches 12a are formed at predetermined intervals in the circumferential direction is different from the first embodiment shown in FIGS. 1 to 4, and other configurations are shown in FIGS. The same as in Example 1.

In the example shown in FIG. 5, a pair of hooks 4 are formed at one end in the axial direction of the clip body 2 at predetermined intervals in the circumferential direction so as to face a pair of notches 12 a formed in the locking rod 12. Yes.
Further, although not shown as another example, it is possible to form three or more hooks 4 at one end in the axial direction of the clip body 2 at predetermined intervals in the circumferential direction.

According to such a pipe fastening structure according to the second embodiment of the present invention, the clip body 2 is engaged with the hooks 12 of the nipple 1 with a plurality of hooks 4 in a balanced manner in the circumferential direction, and the nipple 1 is locked. It is possible to prevent the clip body 2 from rattling with respect to the flange 12.
As a result, the tightening by the clip body 2 is more stable than that of the first embodiment shown in FIGS. 1 to 4, and an excellent pulling strength can be maintained over a longer period, and an accident due to the pulling out of the tube A can be prevented. There is.
In the example shown in FIG. 5, the engagement hole 2 e is penetrated and opened in the band-shaped material that becomes the clip body 2, but the present invention is not limited to this, and there is no engagement hole 2 e as in the example shown in FIG. 4. May be.

As shown in FIG. 6 and FIG. 7, in Example 3, the clip body 2 positioned in the axial direction by the hook 4 with respect to the locking rod 12 and the pipe body A in the radial direction are inserted into the insertion portion 11 of the nipple 1. A configuration in which an annular sealing material 16 that is in pressure contact with the inner surface A2 of the tubular body A clamped by the clip body 2 in the radial direction is provided at a position opposed to the clip body 2 is shown in the first embodiment shown in FIGS. Unlike the second embodiment shown in FIG. 5, the other configurations are the same as those of the first embodiment shown in FIGS. 1 to 4 and the second embodiment shown in FIG.

In the example shown in FIG. 6, the annular protrusion 11 e is formed in the insertion part 11, and the annular sealing material 16 is embedded in the annular protrusion 11 e so that the outer peripheral end protrudes from the outer peripheral surface of the insertion part 11. The arrangement positions of the annular convex portion 11e and the annular sealing material 16 are aligned so as to overlap in the radial direction with the band-shaped material of the clip main body 2 positioned in the axial direction by the hook 4 with respect to the locking rod 12.
More specifically, the annular protrusion 11e is provided with an engaging groove 11f in an annular shape, and the annular seal member 16 is fitted into the engaging groove 11f, so that the outer peripheral end of the annular seal member 16 is an annular protrusion. It is held so as not to move in the axial direction so as to partially protrude from the outer peripheral surface of 11e.
As the annular sealing material 16, it is preferable to use a packing 16a made of an elastically deformable O-ring made of an elastic body such as rubber. The packing 16a is disposed so as to face the movable portion 2c and the like disposed at a substantially central portion in the axial direction of the clip body 2 with the tubular body A sandwiched in the radial direction.

In the example shown in FIG. 7, a plurality (a pair) of annular seal members 16 are embedded in the plurality of annular recesses 11 a formed in the insertion portion 11 so that the outer peripheral ends protrude from the inner bottom surface of the recess groove 11 b. is doing. The arrangement positions of the annular convex portion 11e and the annular sealing material 16 are aligned so as to overlap in the radial direction with the band-shaped material of the clip main body 2 positioned in the axial direction by the hook 4 with respect to the locking rod 12.
More specifically, the groove 11b of each annular recess 11a is provided with a locking groove 11f in an annular shape, and the annular sealing material 16 is fitted into each locking groove 11f, whereby the outer periphery of the annular sealing material 16 is The end is held so as not to move in the axial direction so as to partially protrude from the inner bottom surface of the groove 11b.
As the annular sealing material 16, it is preferable to use a packing 16b made of an elastically deformable O-ring made of an elastic material such as rubber. The plurality of (a pair of) packings 16b are disposed so as to face both end portions in the axial direction of the clip body 2 with the tubular body A sandwiched in the radial direction.

According to such a pipe fastening structure according to the third embodiment of the present invention, the clip body 2 positioned in the axial direction by the hook 4 with respect to the locking rod 12 of the nipple 1 is elastically reduced in diameter and deformed. The inner surface A2 of the body A is strongly pressed against the annular sealing material 16 (the outer peripheral ends of the

packings

16a and 16b), and the inner surface A2 of the tubular body A and the annular sealing material 16 are strongly adhered to each other.
Therefore, the inner surface A2 of the tube body A and the insertion portion 11 of the nipple 1 can be reliably sealed by appropriate tightening of the clip body 2.
As a result, it is possible to prevent leakage with the tubular body A more than the embodiment 1 shown in FIGS. 1 to 4 and the embodiment 2 shown in FIG. Even when the inner surface A2 of the tubular body A is permanently strained and the elastic repulsion force is lowered due to long-term use such as the above, the annular sealing material 16 continues to be strongly crimped thereto, so that no gap is generated, It is possible to maintain a pipe connection with no leakage over the entire area.
As a result, even a flexible tube A such as a synthetic resin hose can be used as a piping material in places where piping is left connected for a long period of time, such as indoor piping in a house. There is an advantage that you can.
In the example shown in FIG. 6, one annular sealing material 16 is arranged so as to face the central portion in the axial direction of the clip body 2 in the radial direction. In the example shown in FIG. 7, the shaft of the clip body 2 is arranged. Two (a pair of) annular seal members 16 are disposed so as to face both ends in the direction, but the present invention is not limited to this, and faces the portions other than the substantially central portion in the axial direction of the clip body 2 and both end portions in the axial direction. It is also possible to arrange the annular sealing material 16 as described above, or arrange or change the number of the annular sealing materials 16 by three or more.

A tube body A2 inner surface 1 nipple 11 insertion portion 11a annular recess 12 locking rod 12a notch portion 13 engagement groove 2 clip body 2a inner peripheral surface 2d end portion 3 operation portion 4 hook 41 bent portion 41d tip end surface 41e space for rotation 16 annular seal material S space

Claims

A nipple inserted into an elastically deformable tube;
A clip body that is elastically deformable in the radial direction and clamps the tube body between the nipple and the nipple;
An operation portion for elastic deformation provided in the clip body;
A hook provided to project from the clip body,
The nipple includes an insertion portion to be inserted into the tubular body, a locking rod provided at an end of the insertion portion, and an engagement groove provided on the opposite side of the insertion portion with the locking rod interposed therebetween. Have
The hook has a bent portion that rides over the locking rod in the axial direction along with the radial deformation of the clip body,
A distal end surface of the bent portion is disposed on an axially extending line of the inner peripheral surface of the clip body, and is opposed to the locking rod and the engaging groove with a space portion therebetween in the radial direction. A pipe fastening structure characterized by being arranged.
The locking rod of the nipple has a cutout portion through which the bent portion of the hook can pass in the axial direction, and the bent portion has a wider space for rotation than the locking rod. The pipe fastening structure according to claim 1.
The insertion portion of the nipple is tightened by the clip body at a position facing the end of the clip body that is axially positioned by the hook with respect to the locking rod and a position facing the radial direction across the tube body. The pipe fastening structure according to claim 1, wherein an annular concave portion that fits in the radial direction with the pipe body is provided in the circumferential direction.
In the insertion portion of the nipple, the tube clamped by the clip body at a position opposed to the clip body in the radial direction across the tube body and the clip body positioned axially by the hook with respect to the locking rod. The pipe fastening structure according to claim 1, 2 or 3, wherein an annular sealing material is provided in pressure contact with the inner surface of the body in the radial direction.