JP2003191991A - Cap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap in which everybody can understand that a lid body is in a favorably opened condition. <P>SOLUTION: An elastic piece 30 is erected from a tip surface of a rib 32 having a hinge part 16 along the inner side of the rib 32. The elastic piece 30 is located on the moving locus of a beam 40 of a contact member 42, and the beam 40 is brought into contact with an inner side of the tip of the elastic piece 30 when a lid body 14 is opened by a predetermined angle. When the lid body 14 is further opened from this condition, the beam 40 allows the elastic piece 30 to be elastically-deformed, and when the beam 40 passes a tip corner part of the elastic piece 30, the elastic piece 30 is flicked to generate a click sound. By generating the click sound with the position of the beam 40 brought into contact with the inner side of the tip of the elastic piece 30 being a reference opening angle of the lid body 14, it is objectively understood that the lid body 14 is opened over the reference opening angle, the lid body 14 is not opened more than required, and the hinge piece 16 is less easily broken. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cap attached to a discharge port of a container.

[0002]

2. Description of the Related Art As shown in FIG. 13, a lid body 104 is integrally formed on a main body 102 of a cap 100 and is rotatable with respect to a main body 102 around a hinge portion 106. An elastic member 108 is provided upright in the vicinity of the hinge portion 106 of the lid body 104, and a groove portion 108A is provided in the central portion.
Are formed.

On the other hand, on the main body 102, a hook 110 having a width that allows engagement with the groove 108A and having a substantially L-shaped cross section is located on the movement locus of the elastic member 108, and the lid 104 is fixed at a predetermined angle. When closed, the hook 110 and the groove 108A are engaged with each other.

When the hook 110 and the groove 108A are engaged with each other, the tip of the elastic member 108 is hooked by the hook 11
When the tip portion of 0 is pressed and elastically deformed to get over the tip portion, the tip portion of the hook 110 is temporarily caught on the peripheral portion of the groove portion 108A and then engages with the groove portion 108A. In this state,
The elastic member 108 moves along the rib 112 formed below the hook 110.

When the hook 110 is disengaged from the groove 108A, the hook 11 is attached to the peripheral edge of the groove 108A.
0 is hooked to elastically deform the hook 110 in the direction to open the angle, and the tip of the elastic member 108 is hooked to the hook 11.
The groove portion 108A is adapted to be disengaged by overcoming the front end portion of 0.

At this time, the hook 110 hooked on the peripheral edge of the groove 108A is repelled, and a click sound is generated. On the other hand, when the hook 110 and the groove 108A are engaged, the tip of the elastic member 108 rides over the tip of the hook 110, and the tip of the hook 110 is inserted into the groove 10.
Since it is caught on the peripheral portion of 8A, the hook 110 is not repelled and almost no click sound is generated.

By the way, the elastic member 108 is formed by the lid 104.
Is opened, the tip portion is slightly curved toward the hook 110 side, and the direction of the urging force of the elastic member 108 is reversed in the process in which the tip portion of the elastic member 108 slides on the rib 112. When the lid body 104 is opened until it passes the (reversal position), the lid body 104 is automatically opened to a predetermined angle.
Conversely, when the lid 104 is closed to the reverse position, the lid 1
04 automatically closes to a predetermined angle.

For this reason, when the lid 104 exceeds the inversion position when an object collides with the lid 104 during use,
The lid 104 automatically closes to a predetermined angle, and in the case of a blind person, the contents are poured out without knowing that the lid 104 is closed to the predetermined angle, and the lid 104 is closed. There is a risk that the contents will get over.

[0009]

SUMMARY OF THE INVENTION In consideration of the above facts, it is an object of the present invention to provide a cap which makes it possible for anyone to know that the lid is in a suitably opened state.

[0010]

According to the first aspect of the present invention, the main body attached to the discharge port of the container is provided with an opening for discharging the contents, and the opening is rotated by the hinge portion. It can be opened and closed by a lid that is connected to the main body.

Here, a contact member is provided upright from the back surface of the lid. On the other hand, a member to be contacted is formed on the main body, which is located on the movement trajectory of the contact member, and when the lid is opened beyond the opening reference angle, the contact member is hit and a click sound is generated.

By thus generating the clicking sound, anyone can know that the lid has been opened beyond the opening reference angle. Therefore, a suitable opening angle of the lid is objectively known, the lid is not opened more than necessary, and the hinge portion is less likely to be damaged.

According to the second aspect of the present invention, when the lid body is closed from the opened reference angle beyond the open reference angle to the open reference angle, the contacted member hits the contact member and a click sound is generated. . This makes it possible for anyone to know that the lid has been closed beyond the reference opening angle.

Therefore, even when the lid body is opened beyond the opening reference angle and the lid body is in a partially closed state by hitting an object, the lid body is opened from the opening reference angle. A click sound is generated in the process of closing the lid from the state to the reference opening angle, so it was found that the lid was closed beyond the reference opening angle even if the eyes were blind, and the lid was closed halfway. There is no fear of pouring out the contents without knowing the condition.

According to the third aspect of the invention, the contacted member is an elastic piece that stands upright from the main body. As a result, the contacted member is easily repelled, and the click sound can be increased.

According to the fourth aspect of the invention, the elastic piece is provided with a plurality of step portions, and the contact member abuts on each of the step portions to generate a plurality of click sounds. This allows the contents to be identified by the number of clicks, even if the caps are used for containers with different contents and the same shape, and the contents are easy even if they are visually impaired. Can be identified.

In the invention according to claim 5, the main body is provided with a guide member positioned on the movement trajectory of the contact member.
This guide member deforms the contact member that slides when opening and closing the lid from the closed state to the opening reference angle, and moves the lid in the closing direction or the opening direction depending on the opening and closing angle of the lid. Energize. That is, the spring effect is obtained by the deformation of the contact member when the lid is opened and closed, and the lid can be opened and closed with a slight force.

According to the sixth aspect of the invention, the contact member is composed of a pair of legs and a beam member. The legs are erected from the back surface of the lid, and the legs are provided with reinforcing ribs.
Further, a beam member is bridged over the upper part of the leg portion, and the beam member contacts the contacted member.

According to the invention of claim 7, the reinforcing rib is provided with a radius R, and at least one contact portion of the reinforcing rib and the guide member is mirror-finished. As a result, the frictional resistance when the tip portion of the reinforcing rib slides on the guide member is reduced, and the contact member can move smoothly.

According to the eighth aspect of the invention, the both ends of the guide member are provided with ridges that bulge in the direction away from the hinge portion, and the thickness of the guide member is uniform. As a result, the convex portion of the mold formed to provide the space between the guide member and the hinge can be made thicker, and the life of the mold can be extended.

According to the ninth aspect of the invention, the raised portion has an arc shape. As a result, compared with the case where the raised portion is formed in a horn shape, even if the content adheres to the guide member, it can be wiped off immediately.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An outline of a cap according to this embodiment will be described.

As shown in FIGS. 2 and 3, the cap 10
Is roughly divided into a substantially cylindrical main body 12, a cylindrical lid 14 that covers the upper surface portion 12A of the main body 12, and a hinge piece 16 that connects the lid 14 to the main body 12 so as to be rotatable. ing.

A female screw portion 12B (not shown in FIG. 4) is formed on the inner peripheral surface of the main body 12, while, as shown in FIG.
A male screw portion 20A into which a female screw portion 12B can be screwed is formed in the mouth portion 20 of the container 18, and the cap 10 is screwed in and fixed to the container 18.

As shown in FIG. 2, the body 1 of the cap 10
A cylindrical discharge port 22 is provided so as to project from the upper surface portion 12A of No. 2 so that the contents in the container 18 can be discharged.
The discharge port 22 is arranged at a position displaced from the hinge piece 16 of the lid body 14 to reduce the opening angle of the lid body 14 which is at least necessary for discharging the contents.

On the other hand, from the rear surface of the lid body 14, an annular rib 24 is formed.
When the opening angle of the lid body 14 becomes θ ₁ (see FIG. 5) when closing the opened lid body 14, the annular rib 24 is inserted into the discharge port 22 and the annular rib 24 The outer peripheral surface slides on the inner peripheral surface of the discharge port 22.

A projecting portion 22A is formed along the circumferential direction on the inner peripheral surface of the discharge port 22, while a projecting portion 24A is formed along the circumferential direction on the outer peripheral surface of the annular rib 24. There is. Here, when the lid 14 is closed, the annular rib 24
When the projecting portion 24A of the vehicle crosses over the projecting portion 22A of the discharge port 22, a click sound (note that this click sound is different from the click sound that is a feature of the present invention) is generated, and at the same time, the lid 1
4 is completely closed, and the discharge port 22 is closed (see FIG. 4). Therefore, when the lid 14 is closed, it can be seen that the lid 14 is completely closed due to the generation of the click sound.

By the way, from the upper surface portion 12A of the main body 12, a substantially rectangular guide portion 26 is erected in a plan view. The guide portion 26 includes a guide member 28, an elastic piece 30 as a contacted member, and a rib 32 that serves as a base portion of the hinge piece 16.
It consists of and.

The rib 32 extends along the outer peripheral surface of the main body 12, and a pair of thin hinge pieces 16 are provided on the tip end surface of the rib 32 so that the rib 32 extends toward the outside of the rib 32 and can be bent. Has become. A lid 14 is continuously provided on the free end side of the hinge piece 16, the lid 14 and the main body 12 are continuously provided by the hinge piece 16, and the lid 14 is rotatable with respect to the main body 12. .

Further, the guide member 28 is provided so as to face the rib 32.
Are arranged, and both ends of the guide member 28 and the ribs 32 are arranged.
It is bridged by the side wall 34 with the both ends of the and forms a space 36. On the other hand, a pair of leg portions 38 are erected from the back surface of the lid body 14 on the main body 12 side, and the tip end portions of the leg portions 38 are bridged by beam members 40. The leg member 38 and the beam member 40 form a contact member 42.

A space 36 formed by the rib 32, the guide member 28 and the side wall 34 is located on the movement locus of the contact member 42. When the lid 14 is opened and closed,
The contact member 42 can be inserted through the space 36.

As shown in FIGS. 4 to 9, the contact member 42 moves in the space 36 between the closed state of the lid 14 and the opening angle θ ₂ . Here, as shown in FIG. 3, the inside of the leg portion 38 forming the contact member 42 (the side opposite to the main body 12).
A reinforcing rib 50 is provided along the longitudinal direction of the leg portion 38 to reinforce the leg portion 38.

Here, as shown in FIG. 5, when the opening / closing angle of the lid 14 becomes θ ₁ , the reinforcing ribs 50 come into contact with the inner wall of the guide member 28, and as shown in FIGS. The inner wall 28A of the member 28 slides. Therefore, the lid 1
4 is guided by the guide member 28 via the contact member 42 so that the lid 14 does not wobble when opening and closing.

By the way, as shown in FIG. 2, a step portion 44 is provided on the peripheral edge of the upper surface portion 12A of the main body 12, and is formed so as to be one step lower than the upper surface portion 12A. This step 4
The width of 4 is substantially the same as the wall thickness of the peripheral wall of the lid body 14,
When the lid 14 is closed, the outer peripheral surface of the lid 14 and the outer peripheral surface of the main body 12 are flush with each other (see FIG. 1).

As shown in FIGS. 1 and 4, the main body 1
On the outer peripheral surface of 2, a gentle concave portion 46 is provided on the side opposite to the hinge portion 16 on the upper surface portion 12A side. On the other hand, on the outer peripheral surface of the lid body 14, a flange portion 48 having a width substantially the same as that of the recess portion 46 formed in the main body 12 projects from the front end surface of the peripheral wall. The lid 14 that has been closed is opened by pushing it up from.

The gist of the cap according to this embodiment will be described.

As shown in FIGS. 2 and 4, the elastic piece 30 is erected from the tip end surface of the rib 32 along the inside of the rib 32. The elastic piece 30 is located on the movement trajectory of the beam member 40 that constitutes the contact member 42. As shown in FIG. 8, when the lid 14 is opened to the opening angle θ ₃ , the beam member 4 is released.
0 contacts the inside of the tip of the elastic piece 30, and when the lid 14 is further opened from this state, as shown in FIG.
0 elastically deforms the elastic piece 30, and the beam member 40 makes the elastic piece 30.
When passing through the tip corner portion of the elastic piece 30, the elastic piece 30 is repelled, thereby generating a click sound.

Here, the opening angle θ ₃ shown in FIG.
4 and the lid 14 has the opening reference angle θ.
_When it exceeds ₃ , click sound is generated. As a result, it can be objectively known that the lid 14 has reached the opening reference angle θ ₃ , and the lid 14 will not be opened more than necessary.
The hinge piece 16 is less likely to be damaged.

Further, since the beam member 40 elastically deforms the elastic piece 30 and passes through the tip corner portion of the elastic piece 30, the lid body 14 is opened beyond the opening reference angle θ ₃ and the lid body 14 is opened.
Even if is rotated in the direction of closing the lid 14 by the restoring force of the hinge piece 16, as shown in FIG.
Since 0 stops in a state of contacting the tip end surface of the elastic piece 30, the lid body 14 does not close without permission.

By the way, when the lid body 14 is opened beyond the opening reference angle θ ₃ and then rotated in a direction of closing the lid body 14, the beam 40 is in contact with the tip end surface of the elastic piece 30. Then, as shown in FIG. 11, when the elastic piece 30 is elastically deformed and the beam 40 passes through the tip corner portion of the elastic piece 30, the elastic piece 30 is repelled, and thereby a click sound is generated. Therefore, it is objectively understood that the lid body 14 is closed beyond the opening reference angle θ ₃ .

Therefore, as shown in FIG. 10, when the lid body 14 is opened beyond the opening reference angle θ ₃ , the lid body 14 hits an object, and as shown in FIG. Even if the lid 14 is closed, a click sound is generated in the process of closing the lid 14 beyond the reference opening angle θ ₃ from the state opened from the reference opening angle θ ₃ (see FIG. 10). Even if the eyes were blind, it was found that it closed beyond the opening reference angle θ ₃ and the lid 1
Without knowing that 4 is in the half closed state,
There is no fear of pouring out the contents.

By erecting the elastic piece 30 along the inside of the rib 32, the amount of bending of the tip of the elastic piece 30 can be increased, the elastic piece 30 is easily repelled, and a click sound is generated. Can be large.

By the way, as shown in FIGS. 4 to 9, the contact member 42 moves within the space 36 until the opening angle θ ₂ is reached from the closed state of the lid body 14, and the contact member 42 moves. When the opening / closing angle is θ ₁ (see FIG. 5), the reinforcing rib 50 contacts the inner wall of the guide member 28. When the lid 14 is further opened from this state, as shown in FIG.
The second leg portion 38 is elastically deformed and the tip portion 50 of the reinforcing rib 50 is
A slides on the inner wall 28A.

On the other hand, the tip portion 50A of the reinforcing rib 50 of the contact member 42 is rounded, whereby the reinforcing rib 5 is formed.
When 0 slides on the inner wall 28A, the leg portion 38 of the contact member 42 moves along the curved surface formed by the R of the tip portion 50A of the reinforcing rib 50 so that the lid body 14 moves through the tip portion 50A of the reinforcing rib 50. It is urged in the opening direction (see FIG. 7) or the closing direction (see FIG. 5). That is, a spring effect is obtained by elastically deforming the contact member 42 when the lid 14 is opened and closed, and the lid 14 can be opened and closed with a slight force.

Further, at least one of the tip portion 50A of the reinforcing rib 50 and the inner wall 28A of the guide member 28 is mirror-finished. The level of this mirror finish is J
MR-3 (the range of surface roughness is 0.24 to 0.48 μR _Z ) is designated as a symbol indicating the surface roughness according to the IS standard. As a result, the frictional resistance when the tip portion 50A of the reinforcing rib 50 slides on the guide member 28 is reduced, and the lid 14 can be smoothly opened and closed via the reinforcing rib 50.

By the way, as shown in FIG. 3, at both ends of the guide member 28, there are provided ridges 52 which bulge in an arc shape in the direction away from the rib 32. Rib 3 also on the inner wall side of the guide member 28.
2 and the guide member 28.
Has a uniform thickness. As a result, in the space 36 provided by the guide portion 26, the distance from the rib 32 is long at both ends of the guide member 28.

Further, in order to form the space 36 provided by the guide portion 26, a protrusion (not shown) is provided in a mold for molding the cap 10, but ribs are provided at both ends of the guide member 28. By increasing the distance from 32, both ends of the convex portion can be made thicker.

Therefore, the life of the mold can be extended. Further, since the raised portion 52 has an arc shape, compared to the case where the raised portion 52 has a rectangular shape, even if the content adheres to the guide member 28, it can be wiped off immediately.

The beam member 40 of the contact member 42 is used here.
Generated a click sound by flipping the elastic piece 30,
For example, as shown in FIG. 12, a plurality of step portions 56 may be provided inside the elastic piece 54, and the beam member 58 may hit each step portion 56 to generate a plurality of click sounds.

As a result, even if the caps are used for containers having different contents and having the same shape, the contents can be identified by the number of click sounds, and the contents can be identified even if the eyes are blind. Objects can be easily identified.

Next, a method of opening and closing the lid of the cap according to this embodiment will be described.

First, a method for opening the closed lid 14 will be described.

As shown in FIG. 4, the flange portion 48 protruding from the outer peripheral surface of the lid body 14 is pushed up by a finger to open the lid body 14 in the direction of arrow A. As a result, the engagement state between the annular rib 24 provided on the lid 14 and the discharge port 22 provided on the main body 12 is released. At this time, since the protrusion 24A formed on the annular rib 24 rides over the protrusion 22A formed on the ejection port 22, a click sound is generated.

When the lid 14 is further opened from this state, the tip portion 50A of the reinforcing rib 50 contacts the inner wall of the guide member 28 as shown in FIG. Then, when the lid 14 is further opened, as shown in FIG.
Of the leg portion 38 of the reinforcing rib 50 elastically deforms,
The lid 14 is urged in the opening direction along the arrow R to open the lid 14 to the opening angle θ ₄ as shown in FIG. 7.

When the lid body 14 is further opened from this state, as shown in FIG. 8, the beam member 40 of the contact member 42 comes into contact with the inner side of the tip of the elastic piece 30, and the lid body 14 opens at the reference opening angle θ.
Reach ₃ Then, as shown in FIG.
Is elastically deformed, and the opening angle of the lid 14 becomes the opening reference angle θ.
_When it exceeds ₃ , as shown in FIG. 10, the beam member 40 passes through the tip corner portion of the elastic piece 30, the elastic piece 30 is repelled, and a click sound is generated.

Here, in the state where the lid body 14 is further opened from the state shown in FIG. 10, even if the lid body 14 is rotated in the closing direction by the restoring force of the hinge piece 16, the beam member 40 is elastic. The lid 14 is not closed any more while it is still in contact with the tip surface of the.

Next, a method of closing the opened lid 14 will be described.

When the lid 14 which has been opened beyond the opening reference angle θ ₃ is closed, as shown in FIG.
The second beam member 40 contacts the tip end surface of the elastic piece 30. When further closed from this state, as shown in FIG. 11, the elastic piece 30 elastically deforms, and when the beam member 40 passes through the tip corner portion of the elastic piece 30, the elastic piece 30 is repelled and a click sound is generated. . As a result, it can be seen that the lid 14 is closed beyond the opening reference angle θ ₃ .

When the lid 14 is further closed from this state, the reinforcing rib 50 provided on the leg portion 38 of the contact member 42 comes into contact with the inner wall of the guide member 28, as shown in FIG. Then, when the lid body 14 is further closed, as shown in FIG. 6, the leg portion 38 elastically deforms to urge the lid body 14 in the closing direction along the R of the tip end portion 50A of the reinforcing rib 50,
As shown in FIG. 5, the lid 14 is closed to the opening angle θ ₁ .

When the upper surface of the lid 14 is pressed in this state,
Projection 24A of annular rib 24 provided on the back surface of lid 14
Rides over the projection 22A of the discharge port 22 of the main body 12, a click sound is generated, and the lid 14 is completely closed.

[0061]

According to the present invention, which has the above-described structure,
In the invention described in (1), since it is possible for anyone to know that the lid has been opened beyond the opening reference angle, the suitable opening angle of the lid can be objectively understood, and the lid can be opened more than necessary. It will not be opened, and the hinge will be less likely to be damaged.

According to the second aspect of the present invention, since it is known to anyone that the lid has been closed beyond the reference opening angle, the lid is opened beyond the reference opening angle. In this state, even if the lid collides with an object and is in a half-closed state, a click sound will be generated when the lid is closed from the open reference angle. Even if it is inconvenient, there is no fear of pouring out the contents without knowing that the lid has been closed beyond the reference angle for opening and the lid is in the half closed state.

According to the third aspect of the present invention, the contacted member is easily repelled and the click sound can be increased. In the invention according to claim 4, even when the cap is used for containers having different contents and the same shape,
You can identify the contents by the number of clicks,
The contents can be easily identified even if they are blind. In the invention according to claim 5, the spring effect is obtained by the deformation of the contact member when the lid is opened and closed, and the opening and closing operation of the lid can be performed with a slight force.

According to the seventh aspect of the invention, the frictional resistance when the tip of the reinforcing rib slides on the guide member is reduced so that the contact member can move smoothly.
In the invention according to claim 8, the convex portion of the mold formed to provide the space between the guide member and the hinge portion can be made thick, and the life of the mold can be lengthened. .
In the invention according to claim 9, compared with the case where the raised portion is formed in a horn shape, even if the content adheres to the guide member, it can be wiped off immediately.

[Brief description of drawings]

FIG. 1 is a perspective view showing a cap and a container according to the present embodiment.

FIG. 2 is a perspective view showing a cap according to the present embodiment.

FIG. 3 is a plan view showing a cap according to the present embodiment.

FIG. 4 is a cross-sectional view showing a state in which the lid of the cap according to the present embodiment is closed.

FIG. 5 is an opening angle θ ₁ of the lid of the cap according to the present embodiment.
It is a cross-sectional view showing the state of.

FIG. 6 is a cross-sectional view showing a state where the contact member of the cap according to the present embodiment is elastically deformed.

FIG. 7 shows an opening angle of the lid of the cap according to the present embodiment is θ ₄
It is a cross-sectional view showing the state of.

FIG. 8 is an opening reference angle θ of the lid of the cap according to the present embodiment.
FIG. ₄ is a sectional view showing ₃ .

FIG. 9 shows that the opening angle of the lid of the cap according to the present embodiment is θ _2.
It is a cross-sectional view showing the state of.

FIG. 10 is a cross-sectional view showing a state in which the lid body of the cap according to the present embodiment is opened beyond the opening reference angle.

FIG. 11 is a cross-sectional view showing a state in which the lid body of the cap according to the present embodiment is closed by being opened beyond the opening reference angle.

FIG. 12 is a cross-sectional view showing another example of the cap according to the present embodiment.

FIG. 13 is a perspective view showing a conventional cap.

[Explanation of symbols]

10 cap 12 body 14 Lid 16 Hinge piece (hinge part) 28 Guide member 28A inner wall (contact part) 30 Elastic piece (contacted member) 38 Legs (contact member) 40 Beam material (contact member) 42 Contact member 50 Reinforcing rib 50A Tip (contact part) 52 Raised part 54 Elastic piece (contacted member) 56 steps 58 Beam material (contact member)

Claims (9)

[Claims] 1. A main body having an opening attached to an outlet of a container for discharging contents, and a lid for opening and closing the opening,
A hinge portion that rotatably connects the lid body to the main body;
And a contact member that is erected from the back surface of the lid body, is formed on the main body, is located on the movement trajectory of the contact member, and opens the lid body beyond an opening reference angle. And a contacted member that generates a clicking sound when hitting the contact member. 2. The contacted member hits the contact member and generates a click sound when the cover is closed to the open reference angle from a state where the cover is opened beyond the open reference angle. The cap according to claim 1. 3. The cap according to claim 1, wherein the contacted member is an elastic piece that stands upright from the main body. 4. The cap according to claim 3, wherein the elastic piece is provided with a plurality of step portions, and the contact member abuts on each of the step portions to generate a plurality of click sounds. 5. The contact member, which is located on the moving path of the contact member and slides when the cover member is opened and closed between the closed state and the opening reference angle, is deformed to change the cover member. The cap according to claim 1, wherein the main body is provided with a guide member for urging the lid body in a closing direction or an opening direction according to an opening / closing angle. 6. The contact member comprises a pair of legs provided upright from the back surface of the lid and provided with reinforcing ribs, and a beam member that is bridged above the legs and hits the contacted member. It was comprised, The cap in any one of Claims 1-5 characterized by the above-mentioned. 7. The cap according to claim 6, wherein a rounded portion is attached to a tip portion of the reinforcing rib, and a contact portion of at least one of the reinforcing rib and the guide member is mirror-finished. 8. The thickness of the guide member is made uniform while providing both ends of the guide member with ridges protruding toward the direction away from the hinge portion. The cap described in any one. 9. The cap according to claim 8, wherein the raised portion has an arc shape.