JP5961546B2 - cap - Google Patents

Description

  The present invention relates to a cap.

  2. Description of the Related Art Conventionally, for example, as shown in Patent Document 1 below, a mounting cylinder that is attached to a mouth portion of a container in which contents are stored, and a lid that is connected to the mounting cylinder via a hinge are provided. The cap is known. The mounting cylinder is formed with an extraction hole communicating with the inside of the mouth of the container. In order to ensure the sealing performance in the container until use, the take-out hole is normally sealed so that it can be opened by a plug-out portion when the cap is manufactured, and this plug-out portion is removed during use.

JP-T-57-502163

  However, the above-described conventional cap has room for improvement in maintaining the lid open with respect to the mounting cylinder and making it easier for the operator to obtain a feel when opening and closing the lid.

  The present invention has been made in view of such circumstances, and can stably maintain a state where the lid is opened with respect to the mounting cylinder, and can easily give the operator a feel when the lid is opened and closed. It aims to provide a cap that can be.

In order to solve the above problems, the present invention proposes the following means.
That is, the cap of the present invention comprises: a mounting cylinder that is mounted on the mouth of a container in which contents are stored; and a lid that covers the opening of the mouth and is connected to the mounting cylinder via a hinge. The hinge includes a main hinge portion located at a central portion in a circumferential direction around the cap axis of the hinge, and a pair of sub hinge portions located on both sides in the circumferential direction of the main hinge portion. The sub hinge portion is formed such that an inner portion located on the main hinge portion side is thinner than an outer portion located on the opposite side of the main hinge portion, and the main hinge portion is It is characterized by being formed thicker than the outer portion of the sub hinge portion.

In the cap of the present invention, when the lid is rotated and opened with respect to the mounting cylinder around the hinge, the auxiliary hinge portions located on both sides in the circumferential direction of the main hinge section are the mounting cylinder and the lid. Are pulled apart and elastically deformed as they are slightly separated in the vicinity of the sub hinge portion.
Here, since the inner part of the sub hinge portion is thin and easily deforms elastically, it is easy to rotate the lid around the hinge. On the other hand, since the outer portion of the sub hinge portion is thicker than the inner portion, the strength of the inner portion is ensured from the outer side in the circumferential direction, and the lid is rotated to be in the open state. A large restoring deformation force (tensile force) is generated, and it is easy to stably maintain the lid in the open state.
In addition, due to the above-described configuration and function of the sub hinge portion, the rotation torque when the lid body is rotated around the hinge is likely to fluctuate greatly, and the lid body is in an open state and closed. The operator can easily recognize that the state has been reached.
Further, since the main hinge part is thicker than the outer part of the sub hinge part and has higher rigidity, the main hinge part has a shorter tensile amount than the sub hinge part when the lid is opened. It is possible to generate a large tensile force in the hinge part, and it is possible to maintain the lid body more stably in the open state, and to change the amount of fluctuation of the turning torque when the lid body is rotated around the hinge. It is easy to ensure a large size, and the operator can be surely recognized that the lid is in an open state and a closed state.

  In the cap of the present invention, of the peripheral edges of the outer portion of the sub hinge portion, the outer edge on the opposite side of the main hinge portion along the circumferential direction is the main hinge along the circumferential direction. It may be formed in a curved shape that is convex toward the opposite side of the part.

  In this case, when the lid is opened, the outer edge of the outer portion of the sub hinge portion, which is the most pulled portion of the hinge, is formed in a curved shape as described above, so that it is sufficiently stretched. It becomes easy to secure the cost, and it is possible to prevent this portion from being easily broken.

  According to the cap of this invention, it can maintain stably in the state which opened the cover body with respect to the mounting cylinder, and can make it easy for an operator to obtain the touch at the time of opening and closing of a cover body.

It is a side view which shows the cap which concerns on one Embodiment of this invention. It is a rear view which shows the cap which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which mounted | wore the container of the cap of FIG.1 and FIG.2. It is a top view which shows the principal part of the cap of FIGS. 1-3 as a cross section. It is a side view explaining the state (open state of a cover body) which turned the cover body around the hinge in the cap of FIGS. The modification (cap with a cap) of the cap of the present invention is shown, and this cap with a cap is attached to the mouth of the container and is a longitudinal sectional view as seen from one side. It is the longitudinal cross-sectional view which looked at the inner stopper of the cap with an inner stopper of FIG. 6 from the one side. It is the semi-longitudinal sectional view which looked at the inner cap of the cap with an inner cap of FIG. 6 from the other side. It is a bottom view which shows the inside stopper of the cap with an inside stopper of FIG.

Hereinafter, a cap 1 according to an embodiment of the present invention will be described with reference to the drawings.
The cap 1 of this embodiment is attached to the mouth 3 of a bottomed cylindrical container 2 in which contents such as liquid are accommodated, and seals the mouth 3 so that it can be opened and closed.
As shown in FIGS. 1 to 5, the cap 1 covers the mounting cylinder 4 mounted on the mouth 3 of the container 2 and the opening of the mouth 3 and is connected to the mounting cylinder 4 via the hinge 5. And a lid 6.
In the illustrated example, the mounting cylinder 4 is extrapolated to the mouth 3 of the container 2. The cap 1 is provided with a seal cylinder 8 that hangs down from the lid 6 and fits into the mouth 3. The mounting cylinder 4, the hinge 5, the lid body 6, and the seal cylinder 8 are integrally formed.

  Here, the central axes of the mouth portion 3, the mounting cylinder 4, the lid 6 and the seal cylinder 8 of the container 2 are located on a common axis. In this specification, this common axis is referred to as a cap axis O, a direction along the cap axis O is referred to as a vertical direction, a lid body 6 side of the cap 1 along the vertical direction is referred to as an upper side, and a lid body along the vertical direction. The direction opposite to 6 is referred to as the lower side, the direction orthogonal to the cap axis O is referred to as the radial direction, and the direction around the cap axis O is referred to as the circumferential direction.

First, the container 2 to which the cap 1 is attached will be described.
As shown in FIG. 3, the mouth 3 of the container 2 has annular protrusions 9, 10, 11 that protrude outward in the radial direction and extend in the circumferential direction with a space in the vertical direction. A plurality are formed. In this embodiment, the three protrusions 9-11 are provided, and among these protrusions 9-11, the lower protrusion 11 located on the lowermost side is the upper protrusion 9 located on the uppermost side, and Compared with the middle protrusion 10 located between the lower protrusion 11 and the upper protrusion 9, the amount of protrusion toward the radially outer side is larger.
Further, the upper end portion 12 of the mouth portion 3 is warped outward in the radial direction so as to gradually increase in diameter toward the upper side. In the longitudinal sectional view shown in FIG. 3, the upper end opening edge of the mouth portion 3 has a sharp shape that gradually decreases in thickness toward the outside in the radial direction. Of the surface of the upper end portion 12 of the mouth portion 3, the upper surface facing upward is formed in a curved surface shape that is convex upward.

The mounting cylinder 4 is fitted on the middle protrusion 10 in the mouth 3 of the container 2, and the lower end opening edge of the mounting cylinder 4 approaches or abuts on the upper surface of the lower protrusion 11.
As shown in FIG. 1 and FIG. 3, the rear portion of the mounting cylinder 4 to which the hinge 5 is connected has a length (height) along the vertical direction from other portions other than the rear portion along the circumferential direction. ) Is getting bigger. The lower end opening edge of the mounting cylinder 4 has the same position along the vertical direction over the entire circumference. As shown in FIG. 3, the rear portion of the mounting cylinder 4 is externally fitted to both the upper protrusion 9 and the middle protrusion 10, and other portions other than the rear portion along the circumferential direction are intermediate protrusions. Only the part 10 is externally fitted.

  Specifically, a plurality of annular projections 13 and 14 that protrude inward in the radial direction and extend in the circumferential direction are formed at the lower end of the mounting cylinder 4 at intervals in the vertical direction. In the present embodiment, two annular protrusions 13 and 14 are provided, and these annular protrusions 13 and 14 are arranged so as to sandwich the radially outer end of the middle protrusion 10 from the vertical direction. 10 can be engaged.

In the illustrated example, of the annular protrusions 13, 14, the projecting amount toward the radially inner side of the annular protrusion 14 that engages with the middle protrusion 10 from below is engaged with the middle protrusion 10 from above. The protrusion amount of the annular protrusion 13 is larger. With such a configuration, the mounting cylinder 4 is undercut fitted to the mouth 3 of the container 2.
In the present embodiment, the protrusion that can be engaged with the upper protrusion 9 is not provided on the inner peripheral surface of the mounting cylinder 4, but such a protrusion may be provided.

The lid body 6 has a top tube shape, and includes a top wall 6a, a peripheral wall 6b, a seal tube 8 provided on the top wall 6a, and an opening / closing operation piece 6c provided on the peripheral wall 6b. .
The top wall 6a has a disk shape, and the seal cylinder 8 projects from the lower surface of the top wall 6a.
The lower end portion of the outer peripheral surface of the seal cylinder 8 is formed in a taper shape that gradually decreases in diameter toward the lower side. In the longitudinal sectional view as shown in FIG. It has a sharp shape that gradually decreases in thickness as it goes to.

  Further, in a state where the lid 6 is closed, the seal cylinder 8 is fitted in the upper end portion 12 of the mouth portion 3 of the container 2, and the upper surface of the upper end portion 12 of the mouth portion 3 is the top wall 6 a. Of the lower surface of the seal cylinder 8 is in contact with or close to a portion located on the radially outer side of the seal cylinder 8. In the illustrated example, a gap is provided between the radially outer end of the upper end 12 of the mouth 3 and the peripheral wall 6b.

As shown in FIGS. 1 and 3, the rear portion of the peripheral wall 6 b of the lid 6 to which the hinge 5 is connected is longer in the vertical direction than other portions other than the rear portion along the circumferential direction. (Height) is getting smaller. And as FIG. 3 shows, the said back part is located above the upper protrusion 9 of the opening part 3 of the container 2 among the surrounding walls 6b, and the said other part is the opening part 3 of the container 2. As shown in FIG. It is fitted on the upper projection 9.
An opening / closing operation piece 6c that protrudes outward in the radial direction and extends along the circumferential direction at a portion of the lower end portion of the peripheral wall 6b that is located on the opposite side of the rear portion sandwiching the cap shaft O in the radial direction. Is formed. In the present embodiment, the opening / closing operation piece 6c has a rectangular plate shape or an arc plate shape.
In addition, a protrusion 16 that protrudes radially inward and extends along the circumferential direction is formed at the lower end of the other portion of the peripheral wall 6b. In the present embodiment, the protrusions 16 are individually formed at positions where the opening / closing operation piece 6c is sandwiched from both sides in the circumferential direction among the lower ends of the other portions of the peripheral wall 6b.

As shown in FIGS. 1, 2, and 4, the hinge 5 includes a main hinge portion 17 located at a central portion in the circumferential direction of the hinge 5, and a pair of hinges 5 located on both sides in the circumferential direction of the main hinge portion 17. And a sub hinge portion 18, which is formed to be elastically deformable.
The inner and outer peripheral surfaces of the main hinge portion 17 are flush with the inner and outer peripheral surfaces of the peripheral wall 6b of the lid body 6 and the inner and outer peripheral surfaces of the mounting cylinder 4, and the main hinge portion 17, the peripheral wall 6b of the lid body 6 and the mounting cylinder. The thickness of each 4 is equal to each other.

The sub hinge portion 18 has an inner portion 20 located on the main hinge portion 17 side and an outer portion 21 located on the opposite side of the main hinge portion 17.
And as FIG. 4 shows, the thickness of the inner part 20 of the subhinge part 18 is formed thinner than the thickness of the outer part 21. As shown in FIG.

The inner peripheral surface of the sub hinge portion 18 is flush with the inner peripheral surfaces of the peripheral wall 6 b of the lid body 6, the mounting cylinder 4 and the main hinge portion 17.
On the other hand, the outer peripheral surface of the sub hinge portion 18 is recessed from the outer peripheral surfaces of the portions (the peripheral wall 6b, the mounting cylinder 4 and the main hinge portion 17) located around the sub hinge portion 18 (retreats radially inward). Thus, the sub hinge portion 18 is thinner than the peripheral wall 6 b of the lid body 6, the mounting cylinder 4, and the main hinge portion 17.
Here, of the surface of the main hinge portion 17, the side end surface 19 facing in the circumferential direction rises substantially vertically from the outer peripheral surface of the inner portion 20 of the sub hinge portion 18 in a cross-sectional view as shown in FIG. 4. Yes.
Further, of the outer peripheral surface of the sub hinge portion 18, the inner portion 20 is recessed relative to the outer portion 21, whereby the inner portion 20 is thinner than the outer portion 21.

In the rear view shown in FIG. 2, the step portion forming the boundary line between the inner portion 20 and the outer portion 21 in the sub hinge portion 18 is convex toward the opposite side of the main hinge portion 17 along the circumferential direction. It is formed in a curved shape.
Note that the stepped portion of the sub hinge portion 18 may be formed in a curved shape that protrudes toward the main hinge portion 17 along the circumferential direction.

Furthermore, in this embodiment, the outer end edge 21a on the opposite side to the main hinge part 17 along the circumferential direction is the main hinge part along the circumferential direction among both peripheral end edges of the outer part 21 of the sub hinge part 18. 17 is formed in a curved shape that is convex toward the opposite side. The outer edge 21 a of the outer portion 21 is connected to the peripheral wall 6 b of the lid 6 via a breakable hinge weakening portion 22.
The outer edge 21a of the outer portion 21 may be formed in a curved shape that is convex toward the main hinge portion 17 side along the circumferential direction.
Further, the connection portion between the upper end of the outer portion 21 and the peripheral wall 6b of the lid body 6 and the connection portion between the lower end of the outer portion 21 and the mounting cylinder 4 are gradually increased from the outer side toward the inner side in the radial direction. It extends toward the inside in the vertical direction.
A connection portion between the upper end of the inner portion 20 and the peripheral wall 6b of the lid body 6 and a connection portion between the lower end of the inner portion 20 and the mounting cylinder 4 extend in the radial direction.

The other portions of the peripheral wall 6b of the lid body 6 and the mounting cylinder 4 respectively include a breakable main weakening portion 24 extending in the circumferential direction, and both peripheral ends of the main weakening portion 24 and the hinge weakening portion 22. They are connected by a pair of breakable sub weakening portions 25 that are connected separately.
The sub weakening portion 25 includes an inclined portion that gradually extends upward from the peripheral end of the main weakening portion 24 toward the rear side of the hinge 5 along the circumferential direction, an upper end of the inclined portion, and a lower end of the hinge weakening portion 22. And a vertical portion extending in the vertical direction. In addition, the shape of the sub weakening part 25 is not limited to the example of illustration, For example, you may form in the shape of a curve.

  The mounting cylinder 4 extends downward from a connection portion between one peripheral end of the main weakening portion 24 and the sub weakening portion 25 and can be broken to reach the lower end opening edge of the mounting tube 4. A portion 28 is formed. The mounting cylinder 4 is divided in the circumferential direction by breaking the classification weakening portion 28. The separation weakening portion 28 is provided for the purpose of use when separating the cap 1 from the mouth portion 3 of the container 2. The classification weakening part 28 should just reach | attain the lower end opening edge of the mounting cylinder 4 from at least one of the peripheral edge parts of the main weakening part 24, and the shape, arrangement | positioning, and number are not limited to the example shown in figure.

  Next, a procedure for opening the cap 1 attached to the mouth 3 of the container 2 will be described.

First, the operator pulls up the opening / closing operation piece 6c with respect to the mounting cylinder 4 and rotates the lid body 6 around the hinge 5 with respect to the mounting cylinder 4, whereby the main weakening portion 24, the sub weakening portion 25, and the hinge. The weakened portion 22 is broken, the lid 6 is opened, and the cap 1 is opened.
Here, in the initial stage of opening the lid body 6, the first coupling portion of the lid body 6 coupled to the upper end of the sub hinge portion 18 and the lower end of the sub hinge portion 18 of the mounting cylinder 4 are coupled. As the second connecting portion is separated from each other, the sub hinge portion 18 is pulled and elastically deformed. Thereby, at the initial stage of opening the lid body 6, the rotational torque necessary for rotating the lid body 6 around the hinge 5 gradually increases. After the rotation of the lid body 6 exceeds a predetermined position, the first connection portion of the lid body 6 and the second connection portion of the mounting cylinder 4 are brought closer to each other, and the sub hinge portion 18 is moved. By restoring and deforming, the lid body 6 is vigorously opened without applying rotational torque. By such an action, the state in which the lid 6 is opened is maintained in the posture of the cap 1 shown in FIG.

In the cap 1 of the present embodiment described above, the inner portion 20 of the sub hinge portion 18 is thin and easily elastically deformed. Therefore, the lid body 6 can be easily rotated around the hinge 5, while the sub hinge portion Since the outer portion 21 of the 18 is thicker than the inner portion 20, when the lid body 6 is rotated and opened from the outer side in the circumferential direction while the strength of the inner portion 20 is secured. A large restoring deformation force (tensile force) is generated, and the lid body 6 is easily maintained stably in the open state.
In addition, due to the above-described configuration and function of the sub hinge portion 18, the rotation torque when the lid body 6 is rotated around the hinge 5 is likely to fluctuate greatly, and the lid body 6 is in an open state. And the operator can easily recognize that it is in the closed state.

Furthermore, since the main hinge portion 17 is formed thicker than the outer portion 21 of the sub hinge portion 18 and has higher rigidity, the lid body 6 is opened when compared with the sub hinge portion 18. A large pulling force can be generated in the main hinge portion 17 having a short pulling amount, the lid body 6 can be maintained more stably in the opened state, and the lid body 6 is rotated around the hinge 5. It is easy to ensure a large fluctuation amount of the turning torque at the time, and the operator can be surely recognized that the lid body 6 is in an open state and a closed state.
Further, when the lid 6 is opened, the outer edge 21a of the outer portion 21 of the sub hinge portion 18, which is the most pulled portion of the hinge 5, is formed in a curved shape as described above. It is easy to secure a sufficient allowance for elongation, and this portion can be prevented from being easily broken.

In this embodiment, instead of the stopper portion, a lid body 6 is provided in which a seal cylinder 8 that fits in the mouth portion 3 of the container 2 is suspended, and the cap body 6 is opened by opening the lid body 6 in use. 1 is opened.
Accordingly, there is no need for an unplugging operation for pulling up the pull top and removing the unplugging portion during use as in the prior art.
Moreover, in this embodiment, since the cover body 6 and the seal cylinder 8 are configured to directly seal the mouth portion 3 of the container 2, the sealing performance is enhanced and the sealing function at the time of manufacturing the cap 1 is improved. Management risk is reduced.

  Further, since the mounting cylinder 4 and the lid body 6 are connected to each other without any gap over the entire circumference by the hinge 5, the main weakening portion 24, the sub weakening portion 25, and the hinge weakening portion 22, for example, the content heated in the container 2 Even when the internal pressure of the container 2 after the cap 1 is mounted may change, such as when cooling after filling with an object, the lid 6 of the cap 1 may open (lid opening phenomenon), or the lid 6 It is possible to prevent water or the like from being sucked into the container 2 from outside the container 2 through the space between the mounting cylinder 4 and the mounting cylinder 4 (water suction phenomenon).

In this cap 1, the mounting cylinder 4, the hinge 5, the lid body 6, and the seal cylinder 8 are integrally formed. At the time of molding, the cap body 6 is closed with respect to the mounting cylinder 4. Yes. Therefore, in the present embodiment, the process of assembling the mounting cylinder in a closed state with respect to the mounting cylinder after molding as in the prior art is unnecessary, and the manufacturing process can be simplified.
Further, since the conventional plug-out portion is unnecessary, the amount of the resin can be reduced and the manufacturing cost can be reduced.

Further, since the mounting cylinder 4 is undercut fitted to the mouth 3 of the container 2, the structure of the cap 1 can be further simplified, and the mounting work of the cap 1 to the mouth 3 of the container 2 is facilitated.
Moreover, according to this structure, the sealing performance of the cap 1 with respect to the opening | mouth part 3 of the container 2 can be improved reliably. The mounting cylinder 4 may be screwed into the mouth 3 of the container 2.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the configuration in which only the cap 1 is attached to the mouth portion 3 of the container 2 has been described. However, the present invention is not limited to this. The cap 2 may be attached to the mouth 3 of the container 2 as a cap with a stopper (cap with stopper during transition).

Here, FIG. 6 is a modified example of the present invention showing a cap 30 with an inner plug formed by mounting the inner plug 31 on the cap 1 described in the above embodiment, and FIGS. 31 is shown. The inner plug 31 is disposed coaxially with the cap 1. In the following description, only a configuration different from that of the above-described embodiment will be described.
In FIG. 6, the upper end 32 of the mouth 3 of the container 2 extends substantially straight in the vertical direction, and protrudes radially outward from the upper end 32 and extends along the circumferential direction. 33 is formed.

7 to 9, the inner plug 31 includes a dispensing cylinder 34 and a cover cylinder 35.
The extraction cylinder 34 has a bottomed cylindrical shape, and includes a peripheral wall 34a and a bottom wall 34b in which an outlet 34c is formed. As shown in FIG. 6, the peripheral wall 34 a is fitted in the upper end portion 32 of the mouth portion 3 in a state in which the cap 30 with the inner stopper is attached to the mouth portion 3 of the container 2, and the peripheral wall 34 a. Inside, the seal cylinder 8 of the lid body 6 is fitted.

  Of the peripheral wall 34a, the upper end portion 36 located above the mouth portion 3 warps outward in the radial direction so as to gradually increase in diameter toward the upper side. In the longitudinal sectional view shown in FIG. 6, the upper end opening edge of the peripheral wall 34a has a sharp shape that gradually decreases in thickness toward the outer side in the radial direction. Of the surface of the upper end portion 36 of the peripheral wall 34a, the upper surface facing upward is formed in a curved surface that is convex upward. The upper surface of the upper end portion 36 of the peripheral wall 34 a abuts or approaches a portion of the lower surface of the top wall 6 a of the lid body 6 that is located on the radially outer side of the seal cylinder 8.

  7 and 8, the bottom wall 34b has a bowl shape that gradually decreases in diameter from the lower end portion of the peripheral wall 34a toward the lower side, and a spout 34c is formed at the lower end thereof. In this modification, the spout 34c has a long hole shape, but is not limited thereto.

In the longitudinal sectional view shown in FIG. 7, the cover tube 35 protrudes from the peripheral wall 34 a at a portion located below the upper end portion 36 so as to gradually go downward as it goes radially outward. . An annular protrusion 37 that protrudes radially inward and extends along the circumferential direction is formed at the lower end of the cover cylinder 35. In FIG. The upper end 32 is engaged with the annular projection 33 from below.
Further, an annular flange 38 that protrudes radially outward and extends in the circumferential direction is formed at the lower end portion of the cover cylinder 35. In FIG. 6, the flange 38 is the circumferential wall 6 b of the lid body 6. And abutting against the mounting cylinder 4.

  According to the cap 30 with the inner stopper described with reference to FIGS. 6 to 9, the peripheral wall 34 a of the pouring cylinder 34 is fitted in the upper end portion 32 of the mouth portion 3, and the seal cylinder 8 is disposed on the pouring cylinder 34. Since it fits in the surrounding wall 34a, the sealing performance in the container 2 can be ensured reliably.

In the above embodiment, the seal cylinder 8 is provided on the lid 6, but the seal cylinder 8 may not be provided, and the other portions of the peripheral wall 6 b of the lid 6 and the mounting cylinder 4 are connected to the main weakening portion 24. And it is not necessary to connect by the sub weakening part 25. FIG.
Instead of the embodiment, for example, the other portions of the peripheral wall 6b of the lid body 6 and the mounting cylinder 4 may be connected to each other by a connection piece that can be excised over the entire circumference.
A closing plate in which the opening of the mouth portion 3 of the container 2 is closed to the cap, and an outlet hole for the contents is formed; and a plugging portion that is removably connected to the closing plate and seals the outlet hole; , May be provided.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 1 Cap 2 Container 3 Mouth part 4 Mounting cylinder 5 Hinge 6 Lid 8 Seal cylinder 17 Main hinge part 18 Sub hinge part 20 Inner part 21 Outer part 21a Outer edge O Cap shaft

Claims (2)

A mounting cylinder to be mounted on the mouth of the container in which the contents are stored;
A lid that covers the opening of the mouth and is connected to the mounting cylinder via a hinge;
A cap comprising:
The hinge is
A main hinge portion located at a central portion in the circumferential direction along the cap axis of the hinge;
A pair of sub hinge portions located on both sides in the circumferential direction of the main hinge portion,
The sub hinge portion is formed such that the inner portion located on the main hinge portion side is thinner than the outer portion located on the opposite side of the main hinge portion.
The said main hinge part is formed thicker than the outer part of the said sub hinge part, The cap characterized by the above-mentioned. The cap according to claim 1,
Out of the peripheral edges of the outer portion of the sub hinge portion, the outer end edge on the opposite side of the main hinge portion along the circumferential direction faces the opposite side of the main hinge portion along the circumferential direction. A cap characterized by being formed in a convex curved shape.

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