JP2012163174A - Clamp device for connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp device 1 for connection which secures uniform winding/fastening distribution for a hose and maintains initial excellent fastened state over a long period of time.SOLUTION: In a fastening mechanism 5 for attaching a housing 4 to a strap band 3, no large bending moment is generated around a protrusion 6 and a tongue portion 7 even in tightening the strap band 3 to the hose with large tightening force for fitting the protrusion 6 of the housing 4 in the first hole portion 9 of the strap band 3 and inserting the tongue portion 7 into the second hole portion 10. Therefore, a gap between the protrusion 6 and the first hole portion 9 and a gap between the tongue portion 7 and the second hole portion 10 are not widened. Uniform winding/fastening distribution for a hose 2 is secured. Circulating medium such as gas refrigerant is not likely to leak to the outside.

Description

  The present invention relates to a connection clamp device that winds a strap band around a connection portion between a tubular member and a metal tube or the like and winds the strap band with a constant tightening force, and more particularly to a connection clamp device having an improved housing mounting structure with respect to the strap band. .

In recent years, in connection clamping devices, since the hose that is a fastened object is required to have high durability, in order to improve the mechanical strength of the hose, the rubber hardness of the hose is increased or reinforcement embedded in the hose. The number of threads is increased, and an adhesive composite structure in which a rubber hose is integrated with a resin hose is used.
For this reason, unlike a normal rubber hose, a high tightening force is required for the hose, which makes it difficult to tighten the hose. As a connection clamping device used for this, for example, there is a screw tightening type tightening band disclosed in Patent Document 1.

  In this screw tightening type tightening band, as shown in FIGS. 12A and 12B, the leg portion 51a of the housing 51 is folded and accommodated in the bulging portion 50 integrally formed with the band 49. The housing 51 is attached to the band 49. The thickness of the leg portion 51 a is set substantially equal to the depth Dp of the bulging portion 50 so that the leg portion 51 a does not protrude into the band 49.

JP-A-52-8255

In the above-described screw tightening type tightening band, when a large tightening force is required for the band 49, a large tension is applied to the band 49. Therefore, the left and right edge portions 50a, 50b of the bulging portion 50 receive a large tensile force P. Then, a bending moment M in the tensile direction is applied to each of the edge portions 50a and 50b {see FIG. 12 (a)}.
As a result, as shown in FIG. 12B, the edge portions 50a and 50b are expanded and deformed to the left and right in the drawing, and the gap Gp is formed between the leg portion 51a and the edge portions 50a and 50b. As a result, the winding distribution on the hose as an object to be fastened becomes non-uniform, and there is a risk that a circulating medium such as a gas refrigerant leaks from the hose whose surface pressure is partially reduced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projection and a first hole even when the strap band is fastened to an object to be fastened with a large fastening force even though the housing is attached to the strap band. There is no possibility that the gap between the tongue portion and the tongue side portion and the second hole portion will be widened, and a uniform winding distribution with respect to the object to be fastened will be ensured, and a circulating medium such as a gas refrigerant may leak out. It is another object of the present invention to provide a connection clamping device that can maintain a good initial tightening state over a long period of time.

(About claim 1)
The end-like annular strap band is wound around an object to be fastened, and a cylindrical housing is provided in a tangential direction on one end side. The screw is inserted from one end opening of the housing and is disposed so as to be rotatable in the housing, and has a helical tooth formed with a predetermined pitch width.
The tooth row portion is provided on the other end portion side which is inserted outside the housing and is located outside the one end portion side of the strap band, traverses the strap band in the width direction, and meshes with the spiral teeth in the circumferential direction. It consists of a plurality of teeth that have a matching angle and are arranged in parallel along the circumferential direction to engage the helical teeth. When the screw is rotated, the other end side slides relative to the one end side, so that the strap band is reduced in diameter and the object to be fastened is tightened.
The fixing mechanism is provided from the housing to the strap band and attaches the housing to one end side of the strap band. The housing side of the fixing mechanism includes a protrusion formed so as to protrude from the bottom portion of the housing to the back surface side, and an insertion side portion formed on the bottom portion and extending along the circumferential direction of the strap band. The strap band side of the fixing mechanism has a first hole portion that is provided on one end portion side of the strap band and that fits and positions the protrusion and a second hole portion into which the insertion side portion is inserted.

In the fixing mechanism for attaching the housing to the strap band, the protrusion of the housing is fitted into the first hole of the strap band, and the insertion side is inserted into the second hole. Even when tightening and applying a tensile force, a large bending moment in the tensile direction does not occur at the protrusion or the insertion side.
Accordingly, the gap between the protrusion and the first hole and between the insertion side and the second hole does not widen, and a uniform winding distribution with respect to the object to be fastened is ensured. Thus, there is no possibility that the circulating medium leaks to the outside, and the initial good tightening state can be maintained for a long time.
Moreover, since it is a simple structure which forms the 1st hole part and the 2nd hole part in the one end part side of a strap band, while being advantageous in cost, it can suppress that the rigidity of a strap band increases.

(About claim 2)
An extended side portion opposite to the insertion side portion at the bottom portion of the housing is fixed to one end portion side of the strap band by attachment means such as welding.
By fixing the extended side portion to the strap band, the housing is firmly and firmly attached, and it is possible to cope with the case where the strap band is tightened with a large tightening force.

(Claim 3)
Instead of inserting the insertion side portion into the second hole portion, it is fixed to one end portion side of the strap band by attachment means such as welding.
By fixing the insertion side portion to the strap band, as in the second aspect, the housing is firmly and firmly attached, and it is possible to cope with the case where the strap band is tightened with a large tightening force.

(About claim 4)
The insertion side portion is provided as a tongue side portion, and the second hole portion is provided by cutting and raising, so that the cut and raised formation functions as a guide member, and the insertion side portion can be easily inserted into the second hole portion. The mounting workability of the housing with respect to is improved.

(Claim 5)
The insertion side portion is provided by half shearing means such as coining, and the second hole portion is provided by cutting and raising, so that the chip is not discharged at the time of manufacturing, and the work process for processing the chip at the time of manufacturing is performed. Omitted as compared with the case of having.

(About claim 6)
On the other end side of the strap band, an end fold band portion composed of a first side portion and a second side portion is formed by folding the other end portion double and fixing them together, and the tooth row portion is also folded. By matching, the tooth portion on the first side portion and the tooth portion on the second side portion correspond to the thickness direction.
In the normal case, the other end side of the strap band forms a dentition portion, and the helical teeth of the screw engage with the dentition portion to receive a load, so that the strength on the other end side is supplemented. There is a need.
On the other hand, in claim 6, since the other end portion side is folded twice, the thickness of the end fold band portion is increased, and the other end portion side can be reinforced with a simple configuration.
In addition, the reinforcement on the other end side is realized by folding and folding only the other end side, so that the rigidity of the entire strap band does not increase rapidly, and good flexibility can be maintained. .

In general, in order to strengthen the dentition, it is conceivable to increase the thickness of the extended portion corresponding to the dentition of the strap band. However, it is difficult to set only the extended part thick in the rolling process for manufacturing the strap band, and even if it is possible, the manufacturing process becomes complicated and the productivity is lowered, which is disadvantageous in terms of cost. There are circumstances to become.
In view of this point of view, the fact that the other end side of the strap band is double-folded and integrally fixed is used to reinforce the other end side having the dentition portion while reducing the thickness of the strap band. It is a clever and excellent means.

(Example 1) which is a perspective view which shows the clamp apparatus for a connection. (A) is a longitudinal cross-sectional view which shows the principal part of the clamp apparatus for a connection, (b) is a top view which shows the one end part side of a strap band regarding a fixing mechanism (Example 1). (Example 1) which is an exploded perspective view which shows a housing and the one end part side of a strap band in relation to a fixing mechanism. (Example 1) which is a cross-sectional view which follows the NN line | wire of Fig.2 (a). (A)-(c) is a perspective view which shows the process of folding and overlapping the other end part side of a strap band twice (Example 1). (Example 2) which is an exploded perspective view which shows a housing and the one end part side of a strap band in relation to a fixing mechanism. (A) is a bottom view of the housing, (b) is a side view showing the bottom of the housing, (c) is a longitudinal sectional view taken along line RR of (a), and (d) is one end side of the strap band. The top view to show, (e) is a longitudinal cross-sectional view which follows the VV line of (d) (Example 2). (Example 3) which is an exploded perspective view which shows a housing and the one end part side of a strap band in relation to a fixing mechanism. (A) is a bottom view of the housing, (b) is a side view showing the bottom of the housing, (c) is a longitudinal sectional view taken along line U1-U1 in (a), and (d) is one end side of the strap band. The top view to show, (e) is a longitudinal cross-sectional view which follows the U2-U2 line of (d) (Example 3). (Example 4) which is a longitudinal cross-sectional view which shows the principal part of the clamp apparatus for a connection. (Example 5) which is a longitudinal cross-sectional view which shows the principal part of the clamp apparatus for a connection. (A), (b) is a broken sectional view which shows the principal part of the clamp apparatus for a connection as a prior art.

  The connection clamping device of the present invention is embodied by the embodiments in which the housing mounting structure to the strap band is improved.

[Configuration of Example 1]
A first embodiment of the present invention will be described with reference to FIGS.
In view of the recent situation where high durability is required for the hose 2 to be fastened, the connecting clamp device 1 in FIG. And so on. For this reason, it is suitable when the hose 2 requires a large surface pressure tightening force as the tightening force, for example, an engine with a supercharger (not shown), in order to increase the air filling rate, This is applied when an intercooler for cooling the compressed air and an intake pipe (both not shown) are connected.

  The connection clamping device 1 includes an end-like annular strap band 3 wound around a hose 2. The strap band 3 is formed in a band shape having a desired width and length by an elastic material such as a SUS304 stainless steel plate. Hereinafter, “winding” and “tightening” of the strap band 3 with respect to the hose 2 are used as words having the same meaning.

  A cylindrical housing 4 is attached to one end side 3A of the strap band 3 along the tangential direction of the one end side 3A. The housing 4 has a round roof portion 4a and attachment sides 4b and 4c on both sides extending from the base portion of the round roof portion 4a (see, for example, FIGS. 3 and 4).

2 to 4, the fixing mechanism 5 is provided from the housing 4 to the strap band 3, and fixes the attachment sides 4b and 4c of the housing 4 to the one end portion side 3A of the strap band 3 in a press-contact state. Is.
In this fixing mechanism 5, a protrusion 6 protruding outward from the bottom 4d, which is the mounting sides 4b and 4c of the housing 4, is formed by half shearing means Q such as coining {FIG. 2 (a) and FIG. 3}.

  As shown in FIG. 3, a tongue portion 7 that slightly inclines with respect to the strap band 3 is formed to extend from the far end portion 4 h on the far side from the protrusion 6 of the bottom portion 4 d. Further, an extended side portion 4e is formed at the near end portion 4k on the near distance side from the protrusion 6 of the bottom portion 4d. The tongue side portion 7 is located on the side opposite to the head portion 8a of the screw 8 described later as an insertion side portion, and is curved in a gentle arc shape according to the curvature of the one end portion side 3A.

A first hole 9 for fitting and positioning the protrusion 6 is provided on one end side 3A of the strap band 3, and the tongue 7 is inserted so as to push up and push up the side 10a. The formed second hole 10 is formed by cutting and raising {see FIG. 2 (b) and FIG. 3}.
The extended side 4e of the bottom 4d opposite to the tongue side 7 is formed by projection welding, resistance welding, arc welding, plasma welding, seam welding or TIG welding, for example, as shown by symbol G in FIG. It is being fixed to 3 A of one end parts by attachment means, such as.

  The dentition portion 11 composed of a plurality of tooth portions 11 a is provided on the other end portion side 3 </ b> B located outside the one end portion side 3 </ b> A of the strap band 3 through the inner bottom portion of the housing 4. The tooth portion 11a has a slit shape, traverses the strap band 3 in the width direction W with a predetermined inclination angle, and is arranged in parallel along the circumferential direction. That is, the tooth portion 11 a has an angle that meshes with the helical tooth 8 s of the screw 8 with respect to the circumferential direction of the strap band 3.

  As shown in FIGS. 5A to 5C, the other end portion side 3B of the strap band 3 is folded and folded twice around the folded portion 3E so as to be integrally fixed. Thus, an end fold band portion 3C composed of the first side portion 3a and the second side portion 3b is formed. The tooth row part 11 is also folded and fixed integrally, whereby the tooth part 11a of the first side part 3a and the tooth part 11a of the second side part 3b face each other so as to communicate with each other in the thickness direction. As a result, the second side portion 3 b of the end fold belt portion 3 </ b> C is positioned so as to be in sliding contact with the one end portion side 3 </ b> A of the strap band 3.

As a fixing means 3F for folding and fixing the other end side 3B integrally, as shown in FIG. 2A, a cylindrical portion 3c formed by burring, for example, at the tip of the first side 3a. An attachment hole 3d is formed in the second side portion 3b so as to correspond to the cylindrical portion 3c. The cylindrical portion 3c is attached to the attachment hole portion 3d by press fitting or caulking, and fixes the first side portion 3a integrally with the second side portion 3b.
In the following description, the wording on the one end side 3A and the other end side 3B is used as it is, omitting the description of the strap band 3.

  As shown in FIG. 2A, the screw 8 is disposed in the housing 4 so as to be rotatable, and is formed with a predetermined pitch width H corresponding to the tooth portion 11 a forming the slit shape of the tooth row portion 11. It has a helical tooth 8s. The helical tooth 8s of the screw 8 is engaged over a part of the tooth part 11a of the second side part 3b from the tooth part 11a of the first side part 3a.

  One end opening 4f of the housing 4 is integrally formed with a ring-shaped end flange portion 12, and the other end opening is integrally formed with a bent ring portion 4g. When the screw 8 is disposed on the housing 4, the base end portion of the head portion 8a is supported by the inner peripheral edge portion 12A of the end flange portion 12, and the tip end of the shaft portion 8b is inserted and supported by the bent ring portion 4g. .

When the screw 8 is rotated in the direction indicated by the arrow Y in FIG. 1 in the tightening process of the screw 8 with respect to the hose 2, the spiral tooth 8s presses and slides on the inner edge of the slit-like tooth portion 11a, and the other end 3B is at one end. By sliding relative to the portion side 3A in the direction of arrow Z in FIG. 1, the strap band 3 is reduced in diameter and the hose 2 is wound up.
As the strap band 3 is reduced in diameter, the cut-and-raised side portion 10a is pushed down by the other end portion side 3B to press the tongue side portion 7, thereby strengthening the pressure contact state of the attachment sides 4b and 4c with respect to the one end portion side 3A. To promote equalization of tightening distribution.

[Effect of Example 1]
In the fixing mechanism 5 for attaching the housing 4 having the above configuration to the strap band 3, the protrusion 6 of the housing 4 is fitted into the first hole 9 of the strap band 3, and the tongue 7 is inserted into the second hole 10. Even when the strap band 3 is fastened to the hose 2 with a large tightening force and a tensile force is applied, a large bending moment in the pulling direction does not occur in the protrusion 6 and the tongue side portion 7.

Thereby, the clearance gap between the protrusion 6 and the 1st hole part 9 and the gap between the tongue part 7 and the 2nd hole part 10 does not expand, and the uniform winding distribution with respect to the hose 2 is ensured. In addition, there is no possibility that a circulating medium such as a gas refrigerant leaks to the outside, and the initial good tightening state can be maintained over a long period of time.
Moreover, since it is a simple structure which forms the 1st hole part 9 and the 2nd hole part 10 in the one end part side 3A, while being advantageous in cost, it can suppress that the rigidity of the strap band 3 increases. .

  By fixing the extended side portion 4e to the one end side 3A of the strap band 3, the mounting state of the housing 4 becomes strong and robust, and it is possible to cope with the case where the strap band 3 is tightened with a large tightening force.

  Since the second hole portion 10 is provided by cutting and raising, the cutting and raising side portion 10 a functions as a guide portion for the tongue side portion 7. For this reason, it becomes easy to insert the tongue side part 7 in the 2nd hole part 10, and the attachment workability | operativity of the housing 4 with respect to the strap band 3 improves. In addition, since the cut and raised side portion 10a is not discharged as chips, it is not necessary to process the cut and raised side portion 10a, and processing time can be saved.

Here, referring to the other end side 3B, in the normal case, the other end side 3B of the strap band 3 forms the tooth row part 11, and the helical tooth 8s of the screw 8 is the tooth part 11a. Therefore, it is necessary to supplement the strength of the other end 3B.
In the first embodiment, the other end 3B is double-folded and fixed integrally so that the thickness of the end fold band 3C is increased, and the other end 3B can be reinforced with a simple configuration.
Moreover, the reinforcement of the other end side 3B is realized by folding and fixing only the other end side 3B in an integral manner, so that the rigidity of the strap band 3 as a whole does not increase rapidly and is good. Flexibility can be maintained.

In general, in order to strengthen the dentition part 11, it is conceivable to increase the band length portion corresponding to the dentition part 11 of the strap band 3. However, in the rolling process for manufacturing the strap band 3, it is difficult to set only the band length portion thick, and even if it is possible, the manufacturing process becomes complicated, the productivity is lowered, and the cost is disadvantageous. There are circumstances that become.
In view of this point of view, folding the other end 3B of the strap band 3 in a double manner reinforces the other end 3B having the tooth row portion 11 while reducing the thickness of the strap band 3. A clever and excellent tool.

[Example 2]
6 and 7 show a second embodiment of the present invention. The second embodiment is different from the first embodiment in that instead of the tongue side portion 7, the relief side portion 14 is formed at the far end portion 4 h of the bottom portion 4 d of the housing 4 by the half shearing means Q such as coining as an insertion side portion. It is that.
When the housing 4 is attached to the strap band 3, the protruding portion 6 of the housing 4 is fitted into the first hole portion 9 and the embossed side portion 14 is inserted into the second hole portion 10 as in the first embodiment. .

  In Example 2, the embossed side portion 14 is provided by coining, and the second hole portion 10 is provided by cutting and forming, so that the chips are not discharged during the production thereof, and the chips at the production time are removed. Omitted as compared with the case of having a work process to be processed.

Example 3
8 and 9 show a third embodiment of the present invention. Example 3 is different from Example 2 in that two embossed side portions 15 having the same shape are provided.
The relief side 15 is formed on both sides along the direction perpendicular to the axis L of the housing 4 at the far end 4h of the bottom 4d of the housing 4 (see FIGS. 8 and 9A to 9C).

As shown in FIGS. 9D and 9E, two second hole portions 16 corresponding to the embossed side portions 15 are cut and raised on the one end portion side 3A of the strap band 3 by molding. Yes. When the housing 4 is attached to the strap band 3, the protruding portion 6 of the housing 4 is fitted into the first hole portion 9, and the embossed side portion 15 is cut up and slidably contacts the side portion 16a. Plugged into.
Even in the third embodiment, chips are not discharged when the embossed side 15 and the second hole 16 are manufactured, and the process of processing the chips at the time of manufacturing is eliminated, so that the omission can be achieved.

Example 4
FIG. 10 shows a fourth embodiment of the present invention. The difference between the fourth embodiment and the first embodiment is that the other end portion 3B of the strap band 3 is not double-folded but extended along the one end portion 3A without being folded. Even if comprised in this way, about the fixing mechanism 5, the effect similar to 1st Example is acquired.
As for the fixing mechanism 5, the fixing mechanism 5 described in the second and third embodiments may be applied to the fourth embodiment.

Example 5
FIG. 11 shows Embodiment 5 of the present invention. The fifth embodiment is different from the first embodiment in that the second hole portion 10 and the cut and raised side portion 10a are omitted from the one end side 3A of the strap band 3, and the tongue side portion 7 is disposed along the upper surface of the one end side 3A. In other words, it is fixed by the welding means G1.
By fixing the tongue portion 7 to the strap band 3, as in the first embodiment, the housing 4 is firmly and firmly attached, and it is possible to cope with the case where the strap band 3 is tightened with a large tightening force.
The configuration in which the tongue portion 7 is fixed to the one end side 3A by the welding means G1 may be applied not only to the fifth embodiment but also to the fourth embodiment.

(Modification)
(A) The strap band 3 in Example 1 may be formed of a reinforced synthetic resin, a copper plate, or various metal alloys instead of the SUS304 stainless steel plate. The housing 4 is not limited to a cylindrical shape, and may be a triangular cylindrical shape, a rectangular cylindrical shape, a pentagonal cylindrical shape, or a polygonal cylindrical shape.
(B) Although the housing 4 is mounted in the tangential direction of the one end side 3A, geometrical accuracy is not required, and a slight deviation from the tangential direction is within an allowable range. That's fine.

(C) In the fixing mechanism 5, the first hole 9 for fitting and positioning the protrusion 6 may be a bottomed hole as a recess that does not penetrate inside and outside. The protrusion 6 and the first hole 9 may be rectangular, triangular, circular, pentagonal, hexagonal, or polygonal as long as they have the same shape.
(D) The first side portion 3a and the second side portion 3b in the first embodiment are various welds (resistance welding, projection welding, arc welding, TIG welding, seam welding, plasma welding), etc., instead of the fixing means 3F. You may make it fix both using the attachment means. Various weldings can be applied to the welding means G1 of Example 5 as described above.

(E) In Examples 1 to 5, the shaft portion 8b of the screw 8 is formed in a drum shape, making the shaft portion 8b easy to follow along the circumferential direction of the strap band 3, and the number of engagement of the helical teeth 8s with the tooth portion 11a. May be increased.

  In the fixing mechanism of the connecting clamp device, the protrusion is fitted into the first hole, and the insertion side is inserted into the second hole. Therefore, even if the strap band is fastened to the object to be fastened with a large tightening force, the protrusion In addition, a large bending moment in the tensile direction does not act on the insertion side, and the gap between the projection and the first hole and between the insertion side and the second hole does not expand. Thereby, the uniform winding distribution with respect to a to-be-fastened thing is ensured, and there is no possibility that circulating media, such as a gas refrigerant, may leak outside. The demand of related companies is stimulated by the excellent tightening function of the strap band, which can be applied to the machine industry through the distribution of related parts.

1 Clamping device for connection 2 Hose (fastened object)
DESCRIPTION OF SYMBOLS 3 Strap band 3a 1st side part 3b 2nd side part 3d Attachment hole part 3A One end part side of a strap band 3B The other end part side of a strap band 3C End folding band part 4 Housing 4b, 4c Housing attachment side 4d Housing bottom part 4e Extension side 4f Housing one end opening 5 Fixing mechanism 6 Projection 7 Tongue side (insertion side)
8 Screw 8a Screw head 8b Screw shaft 8s Spiral tooth 9 First hole 10, 16 Second hole 10a, 16a Cut and raised side 11 Tooth row 11a Tooth 12 Ended flange 14, 15 Relief side (insertion side)
H Pitch width of spiral tooth L Housing axis perpendicular direction W Strap band width direction

Claims (6)

An endless annular strap band that is wound around an object to be fastened by providing a cylindrical housing in the tangential direction on the one end side on the one end side;
A screw that is inserted from one end opening of the housing and is rotatably arranged in the housing, and has helical teeth formed with a predetermined pitch width;
An angle inserted through the inside of the housing and provided on the other end side located outside the one end side of the strap band, traverses the strap band in the width direction, and meshes with the helical teeth in the circumferential direction And a dentition portion composed of a plurality of tooth portions arranged in parallel along the circumferential direction to engage the helical teeth,
In the connection clamp device for tightening the object to be fastened by reducing the diameter of the strap band by sliding the other end side relatively with respect to the one end side during the rotation operation of the screw,
A fixing mechanism provided from the housing to the strap band for attaching the housing to the one end side of the strap band,
A protrusion formed to protrude from the bottom of the housing to the back side;
An insertion side portion formed on the bottom portion and extending along the circumferential direction of the strap band, and a first hole provided on the one end portion side of the strap band for fitting and positioning the protrusion. And a second hole part into which the insertion side part is inserted.   The extension side part on the opposite side to the said insertion side part in the said bottom part of the said housing is being fixed to the said one end part side of the said strap band by attachment means, such as welding. Clamp device for connection.   2. The connection clamping device according to claim 1, wherein, instead of inserting the insertion side portion into the second hole portion, the strap band is fixed to one end portion side of the strap band by welding means or the like.   The connection clamping device according to claim 1, wherein the insertion side portion is provided as a tongue side portion, and the second hole portion is provided by cutting and raising.   The connection clamping device according to claim 1, wherein the insertion side portion is provided by half shearing means such as coining, and the second hole portion is provided by cutting and raising. The other end portion side of the strap band is formed with an end fold band portion composed of a first side portion and a second side portion which are fixed integrally by folding the other end portion double. The connecting clamp device according to claim 1, wherein the tooth portion of the first side portion and the tooth portion of the second side portion correspond to the thickness direction by folding the portion as well.

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