JP4068183B2 - Synthetic resin hinge cap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a synthetic resin hinge cap that is used by being plugged into an opening of a container in which contents such as a liquid are accommodated, and can be easily detached from the opening of the container at the time of separate collection.
[0002]
[Prior art]
The container in which the contents such as the liquid are stored is sealed at its opening by, for example, a synthetic resin cap so that the contents do not leak. The synthetic resin cap is generally attached by being plugged into the container opening. When using a container in which the contents are present, the cap needs to be securely attached and not easily removed while maintaining a sufficiently secure seal against the container opening. On the other hand, after the contents are consumed, the cap is required to be easily removed from the opening of the container in order to separate and collect the resources for reuse of resources and environmental preservation.
[0003]
Examples of the synthetic resin cap for satisfying the above requirements include those disclosed in Japanese Utility Model Publication No. 6-59247. The synthetic resin cap disclosed in the above publication is composed of a main body (spout port) and an upper lid (overcap). The main body is a discharge guide wall (a collar) standing upright on the top wall (top plate), a planned opening (opening) opened by a fractured part, and a container opening by standing down on the periphery of the top wall An outer mounting wall (outer peripheral portion) mounted on the outer mounting wall, and an outer cylinder projecting above the outer mounting wall and having a screw portion. The upper lid has a length that covers the outer cylinder and the outer mounting wall, and is provided with a screw part that can be screwed to the screw part of the outer cylinder, and is connected to the side wall through a hinge part so as to be freely opened and closed. A lid. The outer mounting wall of the main body is formed in a divergent shape. Alternatively, a plurality of cuts (cuts) are formed in the outer mounting wall. When the upper lid is screwed to the main body, the side wall presses the outer mounting wall, and the main body is mounted to the container opening.
[0004]
[Problems to be solved by the invention]
The above-mentioned conventional synthetic resin cap is a so-called synthetic resin hinge cap. When the upper lid is screwed onto the main body, the side wall presses the outer mounting wall and the diameter is reduced to reduce the main body. Since the cap is configured to be attached to the container opening, it is possible to obtain an excellent effect that the cap is firmly attached to the container opening and does not easily come off. However, after the contents are consumed, in order to separate the cap from the container opening for separation and collection, the upper lid is attached to the main body attached to the container opening before the main body is removed from the container opening. It must be relatively rotated at the screwed portion and removed from the main body, the removal operation is relatively troublesome, and the rotation of the upper lid with respect to the main body becomes difficult because the side wall presses the outer mounting wall. There is probably a fear. That is, there is a possibility that the cap cannot be easily detached from the container opening during the separation and collection.
[0005]
In addition, the conventional synthetic resin hinge cap is originally composed of a single integrally molded part, but as described above, the main body and the top cover are integrated by being screwed together. Since it is made of a separate member, it is composed of two parts despite being a synthetic resin hinge cap. As a result, the above-described conventional synthetic resin hinge cap has an increased number of parts and cannot be integrally molded as a whole by a conventional molding method, resulting in an increase in manufacturing cost.
[0006]
The present invention has been made on the basis of the above-mentioned facts, and the main purpose of the present invention is that when the container in which the contents are present is used, it is sufficiently attached to the opening of the container and is not easily detached, To provide a novel synthetic resin hinge cap that can be easily separated from the container opening during separation and collection and can be manufactured at a relatively low cost.
[0007]
[Means for Solving the Problems]
In order to achieve the above main object, according to the present invention, the main body includes a main body and an upper lid that is integrally formed with the main body through a hinge portion so as to be openable and closable, and the main body is formed from the top surface wall and the periphery of the top surface wall. An annular outer mounting wall that extends downward, a planned opening portion formed on the top wall, an annular discharge guide wall that extends upward from the periphery of the planned opening portion, and an upper side from the outside of the discharge guide wall A locking protrusion formed on the outer peripheral surface of the extending annular locking wall, and the upper cover is formed on the top wall portion, a skirt portion extending downward from the periphery of the top wall portion, and an inner peripheral surface of the skirt portion A locking ridge formed on the outer peripheral surface of the container opening on the inner peripheral surface of the outer mounting wall of the main body. In the hinge cap made of synthetic resin in which the locking projection to be locked to the part is formed,
The outer mounting wall of the main body has a smaller outer diameter than the outer diameter of the partial circumferential area by a predetermined radial width, except for the partial circumferential area where the hinge portion is formed. And the axial length of the skirt portion of the upper lid corresponds to the other peripheral area so that the outer peripheral surface of the small-diameter portion of the outer mounting wall can be covered when the upper lid is closed. A portion to be defined is longer than a portion corresponding to the partial circumference ,
When the container opening is plugged into the main body with the upper lid closed, the locking projection formed on the inner peripheral surface of the outer mounting wall is placed on the outer peripheral surface of the container opening. The skirt portion of the upper lid is configured to cover the outer peripheral surface of the small-diameter portion so as to restrain the outer peripheral surface of the small-diameter portion of the outer mounting wall when overcoming the formed locking jaw portion.
A synthetic resin hinge cap is provided.
[0008]
The synthetic resin hinge cap according to the present invention is installed by being plugged into the opening of the container in which the contents are stored with the upper lid closed with respect to the main body. The outer diameter of the outer mounting wall, especially the outer diameter of the small-diameter part, is instantly enlarged during plugging, but it is constrained by the upper lid skirt covering the outer peripheral surface, preventing excessive enlargement, and instantly Since it is returned to the diameter, there is no risk of breakage (when the cut formed in the outer mounting wall is a score).
[0009]
In addition, the outer peripheral surface of the small-diameter portion of the outer mounting wall is covered with the skirt portion of the upper lid with the upper lid closed after the stoppering, so that the expansion of the outer mounting wall in the radially outward direction is restricted, and the locking protrusion The holding force of the container opening to the locking jaw is sufficiently maintained. As a result, the hinge cap is firmly attached to the container opening to maintain the sealing performance, and does not easily come off.
[0010]
On the other hand, at the time of separation and collection, the upper lid is opened with respect to the main body, the skirt portion of the upper lid is opened from the position covering the outer peripheral surface of the small diameter portion of the outer mounting wall, and then the small diameter portion of the outer mounting wall of the main body, particularly the hinge The outer mounting wall can be easily detached from the container opening by forcibly moving the lower end of the part facing the part in the radial direction with the fingertip in the axial direction away from the container opening. Therefore, the entire hinge cap can be easily detached from the container opening.
[0011]
The synthetic resin hinge cap according to the present invention is also composed of a single part in which the main body and the upper lid are connected via a hinge part, and can be integrally formed by a conventional molding method (injection molding). Can be manufactured at low cost.
[0012]
Furthermore, the locking ridge of the upper lid is locked by moving over the locking ridge of the main body in the axial direction, so that when the upper lid is closed with respect to the main body, it adheres to the periphery of the locking ridge of the main body. Even if liquid such as soy sauce is about to splash outside due to the pressure at the time of locking (so-called liquid splashing is generated), the portion corresponding to the other peripheral area of the peripheral edge of the top wall of the main body is as follows: Since the upper lid is covered by the relatively long skirt portion in the axial direction, liquid splash is surely prevented.
[0013]
In the present invention, the outer lid is plugged into the opening of the container that is manufactured to have an outer diameter that has the maximum plus tolerance that allows the locking jaw to be closed with the upper lid closed. Even when the outer diameter of the outer peripheral surface of the small-diameter portion of the wall is substantially maximized, the outer diameter of the outer peripheral surface of the small-diameter portion is the inner diameter of the inner peripheral surface of the skirt portion. It is preferable that a gap is provided in advance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the small diameter portion so as not to substantially exceed the dimension.
[0014]
According to the synthetic resin hinge cap of the present invention, the outer peripheral surface of the small-diameter portion of the outer mounting wall even when the outer diameter of the locking jaw portion is plugged into the container opening manufactured to the maximum allowable size Therefore, it can be reliably prevented that the resistance of the upper lid is opened and closed by pushing the inner peripheral surface of the skirt portion radially outward, so that the upper lid can be opened and closed smoothly as desired. It is done.
[0015]
In the present invention, when the clearance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the small diameter portion is S, and the tolerance of the outer diameter of the locking jaw portion of the container opening is Z, The relationship between S and Z is
S ≧ 1 / 2Z
It is preferable that it is prescribed | regulated.
[0016]
According to the synthetic resin hinge cap of the present invention, the above effect is more specifically achieved. However, the small-diameter portion of the outer mounting wall of the main body and the skirt portion of the upper lid are manufactured with predetermined dimensions without error.
[0017]
In the present invention, it is preferable that a flange portion protruding outward in the radial direction is formed at least at a portion of the lower end portion of the small diameter portion facing the hinge portion in the radial direction.
[0018]
In the synthetic resin hinge cap according to the present invention, when separating and collecting, as described above, when the lower end of the outer mounting wall is forcibly moved in the axial direction away from the container opening by the fingertip, the flange portion is used as a hooking portion of the fingertip. It is possible to make it easier to detach from the container opening. The present invention is particularly useful when an overhang ring (transfer ring) is formed in the container opening.
[0019]
In the present invention, it is preferable that the outer mounting wall is formed with notches extending from the lower end to the upper half part at intervals in the circumferential direction.
[0020]
In the synthetic resin hinge cap according to the present invention, the outer mounting wall can be more easily detached from the container opening during separation and collection. Therefore, the whole hinge cap can be more easily detached from the container opening.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a synthetic resin hinge cap constructed according to the present invention will be described in more detail with reference to the accompanying drawings. The synthetic resin hinge cap, indicated as a whole by number 2, comprises a main body 4 and an upper lid 6 integrally formed on the main body 4 through a hinge portion 5 so as to be opened and closed. The main body 4 and the upper lid 6 can be integrally formed from an appropriate synthetic resin such as polypropylene or polyethylene. The main body 4 includes a top wall 8 that extends substantially horizontally. A breakable score 10 is formed on the top wall 8. As shown in FIG. 5, the score 10 is formed in a loop shape having an appropriate shape when viewed from the axial direction, and constitutes a scheduled opening portion 12. A pull ring 14 for opening extending upward is formed in the planned opening portion 12. The top wall 8 further includes an annular discharge guide wall 16 extending upward from the periphery of the planned opening portion 12, an annular locking wall 18 extending upward from the periphery of the discharge guide wall 16, and extending downward from the periphery of the top wall 8. An annular inner mounting wall 22 extending downward from the inner side of the outer mounting wall 20 in the annular outer mounting wall 20 and the top wall 8 is formed. A locking protrusion 24 is formed on the outer peripheral surface of the annular locking wall 18. An annular gap is formed between the outer mounting wall 20 and the inner mounting wall 22.
[0022]
The upper lid 6 includes a top wall 30 that extends substantially horizontally. The top wall portion 30 is formed with a skirt portion 32 extending downward from the periphery thereof and a cylindrical sealing wall 34 extending downward from the inside of the skirt portion 32. Note that “upper and lower” or “upper and lower” with respect to the upper lid 6 that opens and closes with respect to the main body 4 means the vertical direction in a state where the upper lid 6 closes the main body 4 as shown in FIGS. And A locking protrusion 36 is formed on the inner peripheral surface of the skirt portion 32. Between the lower end outer edge portion of the partial peripheral area C1 (see FIG. 1) of the skirt portion 32 of the upper lid 6 and the upper end outer edge portion of the corresponding partial peripheral area C1 at the peripheral edge of the top wall 8 of the main body 4. A hinge portion 5 is interposed.
[0023]
A locking projection 37 is formed on the inner peripheral surface of the outer mounting wall 20 of the main body 4 over the entire periphery. A plurality of cuts 38 extending from the lower end of the outer mounting wall 20 to the upper half including the locking projection 37 are formed at intervals in the circumferential direction. In this embodiment, the cut 38 is a slit that is completely broken in the radial direction, but of course, it may be a score that is partially broken in the radial direction. In addition, since the outer mounting wall 20 is thinner than a normal cap, even after the slit or score is not formed, it is easier to remove after use (at the time of separate collection) than the conventional cap. Needless to say. Furthermore, instead of forming slits and scores, there may be an embodiment in which one or a plurality of thin portions extending relatively widely in the circumferential direction are formed at intervals in the circumferential direction.
[0024]
Other peripheral area C2 (other than the partial area in the circumferential direction) other than the partial circumferential area C1 (partial area in the circumferential direction) of the outer mounting wall 20 of the main body 4 where the hinge portion 5 is formed. ) Is formed with a small-diameter portion 40 whose outer diameter is partially smaller than the outer diameter of the peripheral region C1 by a predetermined radial width. A flange portion 42 is formed at the lower end portion of the small diameter portion 40 so as to protrude substantially horizontally outward in the radial direction. The outer diameter of the flange portion 42 is defined to be the same as the outer diameter of the partial circumferential region C1 of the outer mounting wall 20 and is continuous with each other. The upper surface 42 a of the flange portion 42 extends obliquely upward in the axial direction at both circumferential ends of the flange portion 42, and is continuous with the annular upper surface 8 a at the periphery of the top wall 8. The top surface 8a of the top wall 8 is positioned on the same plane orthogonal to the axis.
[0025]
The skirt portion 32 of the upper lid 6 has an annular lower surface 6a. The lower surface 6a of the upper lid 6 is positioned on the same plane orthogonal to the axis. The skirt portion 32 of the upper lid 6 is formed such that a portion 32a corresponding to the other peripheral region C2 hangs further downward in the axial direction from the lower surface 6a. That is, the axial length of the skirt portion 32 of the upper lid 6 is such that when the upper lid 6 is closed via the hinge portion 5, the outer circumferential surface C2 can be covered with the outer peripheral surface of the small diameter portion 40 of the outer mounting wall 20. The part corresponding to is defined longer than the part corresponding to the peripheral area C1. As shown in FIGS. 3 and 4, the upper lid 6 is attached to the main body 4 by locking the locked ridge 36 of the skirt portion 32 to the locking ridge 24 of the main body 4. The upper part is closed. In a state where the upper lid 6 is closed, the lower surface 6a of the skirt portion 32 is positioned so as to substantially contact the annular upper surface 8a of the main body 4, and the lower end surface of the portion 32a corresponding to the other circumferential region C2 in the skirt portion 32. 32b is positioned so as to face the upper surface 42a of the flange portion 42 with a slight gap or substantially in contact therewith. With the upper lid 6 closed as described above, the outer peripheral surface of the skirt portion 32a covering the outer peripheral surface of the small diameter portion 40 of the outer mounting wall 20 is substantially the same as the outer peripheral surface of the partial peripheral region C1 of the outer mounting wall 20. It is positioned on the same circumferential surface. A tab 33 for opening the upper lid 6 is formed at the lower end portion of the peripheral area of the skirt portion 32a facing the hinge portion 5 in the radial direction.
[0026]
As shown in FIG. 4, a container 50 formed of an appropriate synthetic resin such as polyethylene terephthalate or glass has a container opening 52. A locking jaw 54 is formed on the outer peripheral surface of the container opening 52. An overhang ring (transfer ring) 56 is formed on the outer peripheral surface of the container opening 52 below the locking jaw 54. The hinge cap 2 is mounted by plugging the container opening 52 after the contents such as the liquid are accommodated in the container 50. By the stopper of the hinge cap 2, the outer peripheral surface of the inner mounting wall 22 is press-fitted into the inner peripheral surface of the container opening 52, and the locking projection 37 of the outer mounting wall 20 is formed on the outer peripheral surface of the container opening 52. It is positioned at a position over the locking jaw 54.
[0027]
When the locking projection 37 of the outer mounting wall 20 gets over the locking jaw 54 of the container opening 52, the outer diameter of the outer mounting wall 20, particularly the outer diameter of the small diameter portion 40, is instantaneously enlarged. It is restrained by the skirt portion 32 of the upper lid 6 covering the cover, in particular, the skirt portion 32a, and excessive expansion is prevented, and the original outer diameter is immediately restored, so there is no risk of breakage (formed on the outer mounting wall 20). If the cut 38 is a score).
[0028]
After the cap 2 is struck, the outer peripheral surface of the small-diameter portion 40 of the outer mounting wall 20 is covered with the skirt portion 32a of the upper lid 6 with the upper lid 6 closed, so that the outer mounting wall 20 expands outward in the radial direction. Is restrained, and the holding force of the locking projection 37 against the locking jaw 54 of the container opening 52 is sufficiently maintained.
[0029]
When separating and collecting the hinge cap 2, the upper lid 6 is rotated around the hinge portion 5 with respect to the main body 4, and the locking protrusion 36 of the upper lid 6 is released from the locking to the locking protrusion 24 of the main body 4. Thus, the skirt portion 32a of the upper lid 6 is opened from the position covering the outer peripheral surface of the small diameter portion 40 of the outer mounting wall 20. Next, the small diameter portion 40 of the outer mounting wall 20 of the main body 4, particularly the lower end of the portion facing the hinge portion 5 in the radial direction, that is, the flange portion 42 is axially separated from the container opening 52 by the fingertip (upward in FIG. 4). ), The outer mounting wall 20, and hence the hinge cap 2, can be easily detached from the container opening 52. The flange portion 42 can be used as a hook portion of a fingertip, and can be further easily detached from the container opening 52. This configuration is particularly useful when an overhang ring 56 is formed on the outer peripheral surface of the container opening 52 as shown in FIG. In addition, if this flange part 42 is formed in the at least one part surrounding area (especially the surrounding area which opposes the hinge part 5 radially) of the lower end part of the outer side mounting wall 20, it can achieve the said function. it can. Of course, there may be an embodiment in which the flange portion 52 is not formed. When removing the hinge cap 2 from the container opening 52, the main body 4 and thus the hinge cap 2 can be removed via the hinge portion 5 by pulling the upper lid 6 instead of the flange portion.
[0030]
The hinge cap 2 is also composed of a single part in which the main body 4 and the upper lid 6 are connected via the hinge portion 5 and can be integrally formed by a conventional molding method (injection molding). Manufacturable at cost.
[0031]
Furthermore, in the hinge cap 2, the upper lid 6 is closed with respect to the main body 4 by the locked protrusion 36 of the upper lid 6 being locked by moving over the locking protrusion 24 of the main body 4 in the axial direction. At this time, even if liquid such as soy sauce adhering to the periphery of the locking protrusion 24 of the main body 4 is scattered outside (so-called liquid jumping) due to the pressure at the time of the locking, the top wall 8 of the main body 4 Since the portion corresponding to the other peripheral region C2 of the peripheral edge of the upper cover 6 is covered with the skirt portion 32a having a relatively long axial length, the liquid splash is reliably prevented.
[0032]
In the hinge cap 2, the container opening manufactured in the outer diameter D having the maximum plus tolerance (+ Zmax when the tolerance is Z) in which the locking jaw portion 54 is allowed with the upper lid 6 closed. Even if the outer diameter of the outer peripheral surface of the small-diameter portion 40 of the outer mounting wall 20 is substantially maximized by being plugged into the portion 52, the outer diameter of the outer peripheral surface of the small-diameter portion 40 is the skirt. A gap S is provided in advance between the inner peripheral surface of the skirt portion 32a and the outer peripheral surface of the small-diameter portion 40 so as not to substantially exceed the inner diameter of the inner peripheral surface of the portion 32a. Therefore, even when the outer diameter D of the locking jaw portion 54 is plugged into the container opening 52 manufactured to the maximum allowable size, the outer peripheral surface of the small diameter portion 40 of the outer mounting wall 20 is the skirt portion 32a. It is reliably prevented that the inner peripheral surface is pressed radially outward to increase the resistance when the upper lid 6 is opened and closed.
[0033]
The relationship between the clearance S between the inner peripheral surface of the skirt portion 32a and the outer peripheral surface of the small-diameter portion 40 of the outer mounting wall 20 and the tolerance Z of the outer diameter D of the locking jaw portion 54 is S ≧ 1 / It is preferable to be defined as 2Z. The tolerance Z is a diameter tolerance, and the gap S is a gap on one side in the radial direction. In this configuration, it is assumed that the small-diameter portion 40 of the main body 4 and the skirt portion 32 of the upper lid 6 are manufactured with predetermined dimensions without error.
[0034]
The preferred embodiment of the apparatus for forming the annular cut surface in the synthetic resin product configured according to the present invention has been described above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiment, Various changes and modifications can be made without departing from the scope of the invention.
[0035]
【The invention's effect】
The hinge cap made of synthetic resin according to the present invention is not securely attached to the opening of the container and will not come off when using the container containing the contents, but easily removed from the opening of the container at the time of separate collection. And can be manufactured at a relatively low cost.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a synthetic resin hinge cap constructed according to the present invention, and showing a state in which an upper lid is opened with respect to a main body.
FIG. 2 is a cross-sectional view taken along the line AA in FIG.
3 is a cross-sectional view showing a state in which the upper lid is closed in the hinge cap shown in FIG. 2;
4 is a cross-sectional view showing a state in which the hinge cap shown in FIG. 3 is plugged into the container opening. FIG.
FIG. 5 is a bottom view of FIG. 1 viewed from the back side.
6 is a side view of FIG. 1 viewed from below. FIG.
FIG. 7 is a view of FIG. 1 as viewed from the left.
[Explanation of symbols]
2 Synthetic resin hinge cap 4 Main body 5 Hinge part 6 Top cover 8 Top wall 12 Opening scheduled part 16 Discharge guide wall 18 Annular locking wall 20 Outer mounting wall 24 Locking ridge 30 Top wall part 32, 32a Skirt part 36 Engagement Stop protrusion 37 Locking protrusion 38 Notch 40 Small diameter portion 42 Flange portion 50 Container 52 Container opening 54 Locking jaw portion C1 Partial peripheral region C2 Other peripheral region S The inner peripheral surface of the skirt portion and the outer peripheral surface of the small diameter portion Gap D between the outer diameter Z D of the locking jaw

Claims (5)

A main body and an upper lid formed integrally with the main body through a hinge portion so as to be openable and closable. The main body is formed on a top wall, an annular outer mounting wall extending downward from the periphery of the top wall, and the top wall. And a latch formed on the outer peripheral surface of the annular discharge guide wall extending upward from the periphery of the planned opening portion and the annular locking wall extending upward from the outside of the discharge guide wall. The upper lid is formed on the top wall portion, a skirt portion extending downward from the periphery of the top wall portion, and an inner peripheral surface of the skirt portion, and is locked to the locking ridge of the main body. A locking protrusion that is locked to a locking jaw formed on the outer peripheral surface of the container opening is formed on the inner peripheral surface of the outer mounting wall of the main body. In the synthetic resin hinge cap
The outer mounting wall of the main body has a smaller outer diameter than the outer diameter of the partial circumferential area by a predetermined radial width, except for the partial circumferential area where the hinge portion is formed. And the axial length of the skirt portion of the upper lid corresponds to the other peripheral area so that the outer peripheral surface of the small-diameter portion of the outer mounting wall can be covered when the upper lid is closed. A portion to be defined is longer than a portion corresponding to the partial circumference ,
When the container opening is plugged into the main body with the upper lid closed, the locking projection formed on the inner peripheral surface of the outer mounting wall is placed on the outer peripheral surface of the container opening. The skirt portion of the upper lid is configured to cover the outer peripheral surface of the small-diameter portion so as to restrain the outer peripheral surface of the small-diameter portion of the outer mounting wall when overcoming the formed locking jaw portion.
A synthetic resin hinge cap. The small-diameter portion of the outer mounting wall is plugged into the container opening that is manufactured to have an outer diameter dimension in which the upper jaw is closed and the locking jaw portion has a maximum allowable plus tolerance. Even if the outer diameter of the outer peripheral surface of the skirt portion is substantially maximized, the outer diameter of the outer peripheral surface of the small diameter portion substantially exceeds the inner diameter of the inner peripheral surface of the skirt portion. The synthetic resin hinge cap according to claim 1, wherein a gap is provided in advance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the small-diameter portion so as not to occur. When the clearance between the inner peripheral surface of the skirt portion and the outer peripheral surface of the small diameter portion is S, and the tolerance of the outer diameter of the locking jaw portion of the container opening is Z, S and Z The synthetic resin hinge cap according to claim 2, wherein the relationship is defined as S ≧ 1 / 2Z. The flange part which protrudes to radial direction outward is formed in the site | part which opposes at least to this hinge part and radial direction of the lower end part of this small diameter part of any one of Claims 1-3. Synthetic resin hinge cap. The synthetic resin hinge cap according to any one of claims 1 to 4, wherein a cut extending from the lower end to the upper half is formed in the outer mounting wall at intervals in the circumferential direction.

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