JPH1016996A - Cap of wide-mouthed container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hinge type cap of a wide-mouthed container provided with a hinge structure excellent in a snap property, durability, and manipulation. SOLUTION: The hinge structure of a cap 10 is constituted of a hinge body movably supporting an overcap 14 against a cap skirt 12 and a three-point hinge provided with elastic pieces at both sides. Respective ends of the elastic pieces are connected arcuately or linearly along the outer peripheral face of the corresponding cap skirt 12 and the overcap 14. The elastic piece forms a nearly arcuate shape between the cap skirt 12 and the over cap 14, in the state opened 180 degrees. The elastic piece becomes thicker as the ends approach. And hence, the stress distribution is made uniform. It is favorable that the connection part of the elastic piece like the cap skirt 12 is formed to shape a part of a cylindrical face or a conical face.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap from which the contents can be taken out without removing it from a wide-mouthed container. Here, the wide-mouthed container refers to a container having a large outlet for taking out contents, and also includes a container such as Tupperware (registered trademark).

[0002]

2. Description of the Related Art As a cap of a wide-mouthed container, a cap skirt fitted on the upper peripheral edge of an opening of the wide-mouthed container, an overcap covering the peripheral edge of the cap skirt, and the overcap can be swung with respect to the cap skirt. Conventionally, a hinge mechanism which is integrally formed of a synthetic resin with a hinge mechanism for supporting the hinge mechanism is known. With such a hinged cap, when removing the contents of the container, the overcap only needs to be swung about the swinging axis of the hinge mechanism, and there is no need to remove the entire cap from the wide-mouthed container. For this reason, in recent years, it has been used as a cap for containers of pasty foods such as miso.

As a hinge mechanism of a hinge-type cap used in a wide-mouthed container, for example, Japanese Utility Model Laid-Open No. 7-2635.
As disclosed in Japanese Patent Publication No. 5 and Japanese Utility Model Laid-Open Publication No. Hei 6-78297, a hinge body for swingably supporting an overcap with respect to a cap skirt is provided.
As disclosed in JP-A-53182, there is a so-called snap type having an elastic piece for swinging an overcap in an open state or a closed state.

[0004]

In order for the hinge-type cap having the snap-type hinge mechanism to be used in a wide-mouthed container, it is preferable to satisfy the following requirements as much as possible. That is, the peripheral edge width of the cap skirt must be reduced so that the outlet for taking out the contents of the container becomes larger. Further, for example, it is necessary that the hinge mechanism be provided as small as possible without protruding outside the cap and be small so that the hinge mechanism does not become an obstacle when storing the container with the cap attached. In addition, when the contents of the container are taken out, operating characteristics (snap properties) when the overcap moves from the conceivable point to the closed state or from the conceived point to the open state, and a resistance felt when the overcap exceeds the conceived point. The feeling (click feeling) needs to be an excellent hinge mechanism. However, the conventional wide-mouthed container cap does not sufficiently satisfy these requirements.

Accordingly, an object of the present invention is to provide a cap for a wide-mouthed container which satisfies the above requirements as much as possible.

[0006]

In order to achieve the above object, a cap for a wide-mouthed container according to the present invention has an opening for taking out the contents of the wide-mouthed container, and has an outer peripheral surface including a curved portion. An annular cap skirt, an outer cap including an outer peripheral surface including a curved surface portion, and an overcap provided over an upper peripheral edge of the cap skirt to close the opening; and an overcap for the cap skirt. And a hinge mechanism for swingably supporting the lid between a closed state and an open state. In a cap integrally formed of synthetic resin, the hinge mechanism can swing the cap skirt and the overcap with respect to each other. And a pair of hinge bodies disposed on both sides of the hinge body and having both ends joined to a cap skirt and an overcap, respectively. A three-point hinge having a sexual piece, and has along each end of the elastic piece to the outer circumferential surface of the corresponding cap skirt and overcap and joining at an arc. Also, remove the overcap from the closed state by one.
In the 180-degree open state where the lid is swung by 80 degrees, the elastic piece is formed to be substantially arc-shaped between the cap skirt and the overcap, and the thickness of the elastic piece is gradually increased toward the end. ing. Note that the 180-degree open state is a state immediately after the cap is taken out of the mold of the injection molding apparatus, and since the elastic piece has no stress or is minimal, the 180-degree open state is referred to in this specification. It is in the reference state. Also, the curved portion of the cap skirt and the curved portion of the overcap may be a part of a cylindrical surface or a conical surface defined by an axis extending substantially parallel to a central axis of each of the cap skirt and the overcap. Features.

In such a configuration, the thickness of the elastic piece is
Since the stress is larger on the end side where stress concentration is more likely to occur, the stress distribution is made uniform.

Further, in the present invention, the curved portions of the cap skirt and the overcap are part of a cylindrical surface or a conical surface. In each curved surface portion, the radius of curvature of the cylindrical surface or the conical surface is set to 100 mm to 500 mm. Is good. Thereby, the hinge mechanism of a large area can be attached to the cap of the wide-mouthed container along the swing axis.

Further, when the value of a factor (W / d) determined by the thickness (W) of the end portion of the elastic piece and the thickness (d) of the central portion of the elastic piece is 1.1 to 5.0. In addition, uneven extension deformation of the end of the elastic piece is prevented, and no excessive resistance is generated when the lid is closed.

In addition, a center point (R1, R2) for defining the arc of the arc-shaped portion of the elastic piece and a swing axis (B) of the hinge body.
And the distance (L, L) between the intermediate point (M) of the hinge body and the side surface of the elastic piece.
I, LH) of the factor (PI / LI, PH / LH) is 0.01 to 0.9, preferably 0.04 to 0.
When it is 3, uneven expansion and deformation between the inner surface and the outer surface of the elastic piece is prevented, and a snapping force for ensuring the opening or closing of the lid is obtained.

[0011] Even when the joint surface between each end of the elastic piece and the corresponding cap skirt and overcap is inclined toward the hinge body, uneven extension between the inner surface and the outer surface of the elastic piece is also possible. Deformation can be prevented.

Further, when the lid is opened at 180 degrees, a concave portion may be formed on the upper surface of the hinge body along the pivot axis. In such a case, the resistance of the hinge body against the engagement of the folded over cap at the time of closing the lid is reduced. This resistance is referred to as a lid-closing resistance sensation, and a good lid-closing resistance sensation indicates that the resistance when the overcap is closed is small.
On the other hand, a poor closing resistance feeling not only indicates that the resistance when closing the overcap is large, but also indicates that the overcap once locked releases the locking.

In the above configuration, the shape of the joint of the elastic pieces is formed as an arc, but may be formed as a straight line.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

In FIGS. 1 and 2, reference numeral 10 denotes a hinge-type cap, which is a synthetic resin integrally molded product comprising a cap skirt 12, an overcap 14, and a hinge mechanism 16. It is.

The cap skirt 12 is formed of a substantially rectangular annular body whose outer periphery is smoothly curved, and has an upper peripheral edge of a wide-mouthed container opening 22 serving as an outlet for taking out a paste-like material such as miso stored in the wide-mouthed vessel 18. It is directly attached by fitting. More specifically, FIGS. 4 and 5
As shown in FIG. 2, an annular projection 20 is provided at the lower portion of the inner peripheral wall of the cap skirt 12 in the circumferential direction and is spaced apart in the circumferential direction. The cap skirt 1
2 is attached to the wide-mouthed container 18 in a substantially adhered state. The projection 20 has a point-like projection, a linear projection,
Band-shaped projections or these may be provided with an undercut portion to reduce the force required for fitting.

The overcap 14 covers the entire upper surface of the cap skirt 12 and has a cap skirt opening 24.
And is swingably attached to the cap skirt 12 via a hinge mechanism 16. In the present embodiment, as clearly shown in FIGS. 5 and 6, the edge of the overcap 14 and the upper edge of the cap skirt 12 are each provided with a stepped end 26.
And a stepped portion 28 is formed. These parts 2
6, 6 are complementary to each other, so that when the overcap 14 is placed over the cap skirt 12, they engage and close the cap skirt opening 24.
As shown in FIG. 6, a concave portion 30 is provided on the inner surface of the end portion 26 of the overcap 14. The concave portion 30 is located at a position substantially opposed to a mounting portion of the hinge mechanism 16. On the other hand, as shown in FIG. 5, a convex portion 32 is provided on the vertical outer surface of the cap skirt 12. The convex portion 32 is arranged so as to fit with the concave portion 30 when the lid is closed. As described above, when the lid is closed, the convex portion 32 and the concave portion 3
0 is fitted and the step-like portions 26 and 28 are engaged with each other, so that the closed state of the cap 10 is maintained, and leakage of the contents is prevented.

The hinge mechanism 16 is a three-point hinge, and includes a hinge body 32 and elastic pieces 34 arranged on both sides of the hinge body 32. The hinge body 32
As clearly shown in FIG. 3 and FIG.
32a projecting outward along the upper edge of the annular body
And a portion 32b protruding outward along the upper edge of the overcap (the edge on the side in contact with the cap skirt 12 when the lid is closed), and these portions 32a and 32b They are integrally connected. The overcap 14 is swung about a horizontal axis on the coupling surface A as a swing axis B. In this embodiment, as shown in FIG.
“b” has a substantially triangular prism shape facing each other, and is configured so that the connecting portion is the thinnest. A concave portion 32c is formed on the upper surface of the coupling portion along the direction of the swing axis B. Due to the concave portion 32c, resistance to folding of the hinge body 32 and closing of the overcap when the lid is closed is small. Become.

Both ends of each elastic piece of the hinge mechanism 16 are connected to the cap skirt 12 and the overcap 14 respectively.
Is joined to. More specifically, when the lid is opened at 180 degrees, both ends of the elastic piece 34 extend along the outer peripheral surfaces of the cap skirt 12 and the overcap 14 as shown in FIGS. 2, 3, and 7 to 9. They are joined in an arc. Cap skirt 12 and overcap 14 to which each joint end 34a, 34b is joined
Is a part of a substantially cylindrical surface (including not only a cylindrical surface but also a conical surface) defined by an axis parallel to the central axes X and Y of the cap skirt 12 and the overcap 14. . Therefore, each joint end 34a, 34b
The center of the arc made by passes along the axis of the curved surface.
Further, as shown in FIG. 7, the cross-sectional shape of the central portion of the elastic piece 34 is substantially rectangular.

Further, as shown in FIG.
The side surface (hereinafter, referred to as “inner surface”) 34c and the opposite side surface (hereinafter, referred to as “outer surface”) 34d of the inner side (the hinge body 32 side) 34d are respectively formed by the middle point M of the hinge body 36 and the cap. Skirt 12 or overcap 1
4 is located on a plane (plane C and plane B in FIG. 3) opposite to a vertical reference plane P formed by the center axis of FIG.

Further, in the 180-degree opened state, when viewed from the direction of the swing axis B of the hinge main body 32, the shape of the elastic piece 34 is substantially arc-shaped. More specifically, as shown in FIG. 8 which is an end view along line VI-VI of FIG. 3 or FIG. 7, and FIG. 9 which is an end view along line VII-VII of FIG. 3 or FIG. In addition, the lower surface of the elastic piece 34 is
From the other end 34b. In addition, the upper surface of the elastic piece 34 also has arbitrary intersections X1 and X that intersect the upper surface of the elastic piece 34 when a point on an intersection line where the lower surface of the elastic piece 34 intersects with the horizontal plane is extended vertically upward.
2 and 2 have an arc shape. Further, the upper surface of the elastic piece 34 extends linearly from the intersection X1 to the joint end 34a. The direction of this linear portion substantially matches the normal direction at the intersection X1 of the arc. Similarly, the space between the intersection X2 and the joint end 34b is also linear. Thereby, the thickness of the elastic piece 34 becomes larger toward the joint ends 34a and 34b.

When such an elastic piece 34 swings the overcap 14 from the open state of 180 degrees to the closed state, the linear distance between the joint ends 34a and 34b gradually increases to the conceivable point. Go. Since the elastic piece 34 is made of an elastic material and has a minimum stress in the 180-degree opened state, the elastic restoring force increases as the distance between the joining ends 34a and 34b increases. Go. Therefore, from the 180-degree opened state to the conceived point, a pulling force acts on the overcap 14 to return to the 180-degree opened state.

When the overcap 14 reaches a conceivable point,
The distance between the joint ends 34a and 34b of the elastic piece 34 is maximized. At this time, the elastic piece 34 is in a substantially linear state. When the overcap 14 is further swung, a pulling force acts on the overcap 14 in a direction to close the lid. Thus, even if the hand is released from the overcap 14, the overcap 14 automatically swings in the direction of the closed state. Although the cover is not completely closed due to the resistance of the hinge body 32, the cover is finally closed by forcibly fitting the overcap 14 to the cap skirt 12. At this time, the elastic pieces 34 protrude outward.

The overcap 14 is moved from the closed state to 18
In the case where the overcap 14 is swung to the 0-degree open state, resistance is added to the swing of the overcap 14 up to the expected point, and when the point exceeds the expected point, the overcap 14 is automatically opened (not necessarily the 180-degree open state). And stabilize in that state.

When the overcap 14 is swung in this manner, the hinge mechanism 16 according to the present invention employs the elastic piece 3
4, the inner surface 34c and the outer surface 34d, particularly the inner surface 34c
And the end of the outer surface 34d is located at the midpoint M of the hinge body 32.
Move on the planes C and D parallel to the reference plane P passing through the elastic piece 32, the elastic piece 32 hardly twists. For this reason, there is no loss of the tensile force due to the twist, and a better snap property or a click feeling can be obtained. In addition, there is an effect that stress due to twisting does not occur.

Further, as described above, in the present invention, the thickness of the elastic piece 34 is increased toward the joint ends 34a and 34b. When the overcap 14 is rocked, the elastic piece 34 generates greater stress at the joint ends 34a and 34b. Therefore, by increasing the thickness of the joint ends 34a and 34b, the stress distribution can be made uniform. Become. Now, the thickness of the joining end portions 34a and 34b with respect to the inner surface 34c is set to W.
I, the thickness of the joining ends 34a, 34b with respect to the outer surface 34d is WH, the average thickness of the joining ends 34a, 34b is W,
When the thickness of the central portion of the elastic piece 34 is d (see FIGS. 8 and 9), a factor (W / d = (W
When I + WH) / 2d) is small, specifically, smaller than 1.1, stress is concentrated on the joint ends 34a and 34b of the elastic piece 34 when the overcap 14 swings, and the joint end There is a possibility that uneven elongation deformation or cutting of 34a and 34b may occur. On the other hand, when the factor (W / d) is large, specifically, when the factor (W / d) is larger than 5.0, the resistance at the time of closing the cover may become too large, and the operability may be deteriorated.
Therefore, if the shape of the elastic piece 34 is determined so that the factor (W / d) is 1.1 to 5.0, the resistance at the time of closing the lid is suppressed and the stress on the joint ends 34a and 34b is reduced. Concentration can be prevented, which is preferable.

Further, in order to obtain a further snapping property and a click feeling in this embodiment, the hinge mechanism needs to occupy a large area along the axial length direction of the swing shaft. Therefore, in the cap 10 of the wide-mouthed container to which the hinge mechanism is applied, the radius of curvature of the substantially cylindrical surface forming the curved surface portion of each of the cap skirt 12 and the overcap 14 is 100 m.
It is more preferable that the distance is from m to 500 mm.

Further, both ends 34a, 34b of the elastic piece 34
Are joined to the outer peripheral surfaces of the cap skirt 12 and the overcap 14, respectively. At this time, the elastic piece 34
The difference between the total lengths of the inner side surface 34c and the outer side surface 34d is made large in advance.
This is because the purpose is to suppress the concentration of stress caused by the difference between the maximum elongation between the joining ends 34a and 34b for c and the maximum elongation between the joining ends 34a and 34b for the outer surface 34d.

In the present invention, the distances in the direction of the swing axis from the intermediate point M of the hinge body 32 to the inner side surface 34c and the outer side surface 34d of the elastic piece 34 are LI and LH, respectively (see FIG. 3). The shortest distance from the extension of the swing axis B of the hinge body 32 to the center points R1 and R2 defining the arcs of the inner surface 34c and the outer surface 34d of the elastic piece 34 is P
I and PH (see FIGS. 8 and 9), and the factors (PI / LI) and (PH / LH) determined by these distances are 0.01.
０．９0.9. This factor (PI
/ LI) and (PH / LH) are experimentally obtained. When the ratio is smaller than 0.01, the snapping force is small, and the resistance when the overcap 14 exceeds the expected point, that is, the clicking feeling, is reduced. Not only is it small, but the position of the overcap 14 in the open state is not determined and becomes unstable. If the factors (PI / LI) and (PH / LH) exceed 0.9, the elastic piece 34 has a non-uniformly elongated shape in the direction of extension, and a loss occurs in the tensile force of the elastic piece 34. As a result, the snap property deteriorates. Therefore, the factors (PI / LI) and (PH / LH) are 0.01 to 0.5.
9 is preferable, but when it is more preferably 0.04 to 0.3, a sharper click feeling is obtained, and it is difficult to form a shape that is unevenly extended by repeated swinging. It is even more preferred.

The inventors of the present application have described a cap 1 as described above.
0 was actually manufactured, but injection molding was performed using a synthetic resin having properties of a density of 0.90 g / cm ³ , a melt index of 30, and a crystal melting temperature of 145 ° C. Was. In the injection molding process, a Netomat series model N800 / 200 injection molding machine manufactured by Sumitomo Heavy Industries, Ltd. was used, a single-piece mold was mounted on the injection molding machine, a mold clamping force of 200 ton, a nozzle set temperature of 220 ° C., and a cycle. Molding was performed in a time of 12 seconds.

The shapes of the cap skirt 12 and the overcap 1 are substantially similar to those shown in the figure.
4 had a side of about 130 mm. Also, the hinge mechanism 16
Three types of caps 10 were manufactured in order to examine the characteristics of. Each cap 10 has a factor (PI /
LI) and the average value of the factors (PH / LH), which were 0.04, 0.18, and 0.60, respectively.

These caps 10 had slight differences in snapping properties and click feeling when the lid was opened or closed by hand, but all were within a practical range.
Also, as a result of the experiment, it was found that the device had sufficient practical performance even after the lid was opened and closed 500 times.

Further, a drawn body obtained by plug-assist deep drawing of a sheet made of polyethylene having a thickness of about 500 μm is used as a wide-mouthed container, and the cap skirt 12 of the cap 10 is fitted to the upper peripheral edge of the opening. Assembled. The drawn molded body has a shape similar to that of FIG. 2 in which the bottom surface is substantially rectangular, and the side surfaces and corners are curved surfaces.

Then, about 80% of the molded body was filled with raw miso containing live yeast, and the cap 10 was closed.
When the filled container was stored at room temperature for one week in a dark place, the container did not swell or the cap did not come off due to the generated carbon dioxide gas.

Incidentally, the cap skirt 12 of the cap 10 used for the wide-mouthed container needs to have a large opening in order to take out the contents as much as possible. Thus, the width of the annular body forming the cap skirt 12 is preferably as small as possible. In the cap of the publication described in the section of the prior art, not only the opening is enlarged, but also the width of the annular body is reduced to obtain the snap property and the click feeling as in the present invention, and the arc-shaped elastic piece is formed. Must be aligned with the pivot axis of the hinge body. However, the strength is reduced by reducing the width. Therefore, at the time of opening and closing the overcap, the cap skirt is subjected to a kind of twisting movement such as yawing, which may lead to breakage of the cap.
However, since the hinge mechanism 16 of the present embodiment is mounted symmetrically with the swinging axis while keeping the strength of the annular body and keeping its width as small as possible, the annular body is not damaged by a decrease in strength. Absent.

In order to make the elastic axis of such a cap coincide with the swing axis of the hinge main body, it is conceivable to provide the entire hinge mechanism so as to protrude largely outside the overcap and the cap skirt. This leads to a decrease in the operability and handleability of the cap, as well as a reduction in appearance or smoothness. On the other hand, in the present embodiment, the small elastic piece 34 is arranged symmetrically with respect to the swing axis so that the elastic restoring force can be efficiently used. Can be smaller. Therefore, the overcap 12
And it does not protrude greatly outside the cap skirt 14.

Further, in the conventional cap disclosed in Japanese Unexamined Utility Model Publication No. 7-26355, a swing mechanism is realized by providing a concave portion in a mounting portion of the hinge mechanism. For this reason, a notch portion is present in the concave portion, and a groove is provided on a peripheral edge of an inner surface of the overcap, and fitted to the upper surface of the cap skirt in order to improve sealing of the cap in a closed state. A step-like portion was provided. However, since the opening of the cap skirt needs to be enlarged, a groove and a step-like portion cannot be provided in the mounting portion of the hinge mechanism.
Insufficient sealing performance. On the other hand, in the present embodiment, since no hinge mechanism is provided inside the cap, such a notch does not exist. For this reason, a sufficient sealing property is easily achieved in the closed state of the cap, and the section formed by the opening of the cap skirt and the hinge mechanism is adjusted according to the rigidity of the synthetic resin cap skirt and the overcap. The width of this section can be provided so as to obtain mechanical strength. So far, what has been contained in wide-mouth containers has been limited to paste-like with no or little fluidity, but powdery, granular,
Alternatively, a fluid such as a liquid may be used.

When the contents of the wide-mouthed container are food, gas such as carbon dioxide gas may be released depending on the type. For example, in the case of the above-mentioned miso, it is common to heat-treat the yeast contained therein so that it can be distributed at room temperature. I have. This raw miso generates carbon dioxide gas due to its metabolism, and the inside of a closed container is filled with carbon dioxide gas, and the container or cap may be subjected to a large load. In this embodiment, in this case, the cap skirt 12
Further, the overcap 14 is fitted only when the lid is closed by the concave portion 28 and the convex portion 30 which are separately provided.
Even if the pressure becomes higher than the pressure at which carbon dioxide gas is generated,
Such a load is suppressed because the air can be ventilated to the outside from the mere engagement portion of the cap skirt 12 and the overcap 14. It is clear from the above-mentioned experimental results that even if a gas such as carbon dioxide gas is released, the contents of the container are preserved and stored without any problem. In addition, foods that generate such carbon dioxide gas include, besides raw miso, skinned garlic, yam, unheated natural cheese, roasted coffee beans, and the like.

Although the preferred embodiments of the present invention have been described in detail, it goes without saying that the present invention is not limited to the above embodiments. For example, in the above embodiment, as shown in FIG. 8 or FIG.
Although a and 34b are arcs centered on the center axis of the cap 10 on both sides, the arcs may be formed on one side only. Alternatively, a concave portion is provided on the outer peripheral surface and an elastic piece is provided therein. You may make it arrange | position. Such a form is referred to herein as "form an arc along the outer peripheral surface".

Further, the joining ends 34a, 34 of the elastic pieces 34
The shape of b does not need to be an arc shape, and may be a straight line along the outer peripheral surface of the cap skirt 12 or the overcap 14 according to the outer peripheral surface of the cap 10. The term “straight along the outer peripheral surface” refers to a mode in which the horizontal cross-sectional shape of at least one surface of the elastic piece 34 is a chord centered on the center axis of the cap or the horizontal shape of at least one surface of the elastic piece 34. A mode in which the cross-sectional shape is a straight line. Of course, it is also possible to adopt a configuration in which an arc is formed on one surface side and a straight line is formed on the other surface side. Here, "along the outer peripheral surface" means substantially along the outer peripheral surface,
For example, when knurling is applied for anti-slip,
The meaning is along the outer peripheral surface assuming a flat surface without this processing.

Further, in the above embodiment, the elastic piece 34
When the shape is elongated, the shape becomes substantially rectangular. However, from the viewpoint of making the stress distribution uniform, the shape may be such that the width is narrowest at the middle portion and becomes larger toward the end portion.

[0042]

As described above, according to the present invention, since the elastic piece of the hinge mechanism is prevented from being twisted, the elastic restoring force generated in the elastic piece is efficiently used as a snap force for pulling the overcap. It is possible to do. Therefore, a good snap property and a click feeling can be obtained.

Further, the elastic piece is provided at a position symmetrical to the pivot axis of the cap, and the elastic restoring force can be efficiently used, whereby the size of the elastic piece can be reduced. For this reason, the hinge mechanism can be made smaller with respect to the cap. This improves the handleability or the operability, and has an excellent effect in that the appearance or smoothness is good (that is, the ratio of the hinge mechanism protruding outward from the outer peripheral surface of the cap is small).

Further, in connection with the size reduction and the mounting position of the elastic piece, the opening of the cap skirt can be easily enlarged and the cap can be easily sealed.

Further, according to the present invention, since the distribution of the stress generated in the elastic piece is made uniform, it can sufficiently withstand repeated use.

[Brief description of the drawings]

FIG. 1 is a top view of a wide-mouthed container according to the present invention in a 180-degree opened state.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged top view showing details of a hinge mechanism of the cap of FIG. 1;

FIG. 4 is an enlarged partial cross-sectional view showing details of an S portion in the cap of FIG. 2;

FIG. 5 is an enlarged partial cross-sectional view showing details of a portion T in the cap of FIG. 2;

FIG. 6 is an enlarged partial cross-sectional view showing details of a U portion in the cap of FIG. 2;

7 is a top view showing details of an elastic piece of the hinge mechanism of FIG. 3, and a cross-sectional view taken along line III-III of the top view.

FIG. 8 is a view showing the elastic piece in the hinge mechanism, taken along the line VI-VI in FIG. 4;
It is an end elevation along a line.

FIG. 9 shows the elastic piece in the hinge mechanism, and is VII-VI in FIG.
FIG. 3 is an end view along a line I.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Cap, 12 ... Cap skirt, 14 ... Over cap, 16 ... Hinge mechanism, 18 ... Wide-mouth container, 2
2: wide mouth container opening, 24: cap skirt opening,
32: hinge body, 34: elastic piece.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyuki Hidaka 18-13 Kamitamari, Tamari-mura, Niigata-gun, Ibaraki Pref.Resin Processing Technology Center, Kureha Chemical Industry Co., Ltd. (72) Inventor Shigeharu Masuda Nihonbashi, Chuo-ku, Tokyo 2-2-2 Horidomecho Sanko Molding Co., Ltd.

Claims (8)

[Claims] Claims: 1. A wide-mouthed container is directly attached to an upper peripheral edge of the container,
An annular cap skirt having an opening serving as an outlet for taking out the contents of the wide-mouthed container and having an outer peripheral surface including a curved surface portion, and an outer peripheral surface including a curved surface portion, and an upper peripheral edge of the cap skirt An overcap for covering the opening and closing the opening, and a hinge mechanism for swingably supporting the overcap with respect to the cap skirt between a closed state and an open state, and a synthetic resin. Wherein the hinge mechanism comprises a hinge body that supports the cap skirt and the overcap so that they can swing relative to each other; and a cap skirt that is disposed on both sides of the hinge body and has both ends. A pair of elastic pieces joined to the overcap, wherein each end of the elastic pieces corresponds to the cap scar. And are joined in an arc along the curved surface portion of the overcap, and in the 180-degree open state in which the overcap is swung 180 degrees from the closed state, the elastic piece is connected to the cap skirt. The elastic piece has a substantially arc shape with the overcap, and the thickness of the elastic piece is gradually increased toward the end, and the curved surface portion of the cap skirt and the curved surface portion of the overcap are the cap skirt and the overcap. And a part of a cylindrical or conical surface defined by an axis extending substantially parallel to the respective central axis of the jar. 2. It is attached directly to the upper periphery of the wide-mouthed container,
An annular cap skirt having an opening serving as an outlet for taking out the contents of the wide-mouthed container and having an outer peripheral surface including a curved surface portion, and an outer peripheral surface including a curved surface portion, and an upper peripheral edge of the cap skirt An overcap for covering the opening and closing the opening, and a hinge mechanism for swingably supporting the overcap with respect to the cap skirt between a closed state and an open state, and a synthetic resin. Wherein the hinge mechanism comprises a hinge body that supports the cap skirt and the overcap so that they can swing relative to each other; and a cap skirt that is disposed on both sides of the hinge body and has both ends. A pair of elastic pieces joined to the overcap, wherein each end of the elastic pieces corresponds to the cap scar. And is joined in a straight line along the curved surface portion of the overcap, and in the 180-degree open state in which the overcap is swung 180 degrees from the closed state, the elastic piece is connected to the cap skirt. The elastic piece has a substantially arc shape with the overcap, and the thickness of the elastic piece is gradually increased toward the end, and the curved surface portion of the cap skirt and the curved surface portion of the overcap are the cap skirt and the overcap. And a part of a cylindrical or conical surface defined by an axis extending substantially parallel to the respective central axis of the jar. 3. The wide-mouthed container according to claim 1, wherein a radius of curvature of a cylindrical surface or a conical surface of the curved portion of the cap skirt and the curved portion of the overcap is 100 mm to 500 mm. cap. 4. A factor (W / d) determined by a thickness (W) of an end portion of the elastic piece and a thickness (d) of a central portion of the elastic piece.
The cap for a wide-mouthed container according to any one of claims 1 to 3, wherein a value of the cap is 1.1 to 5.0. 5. A concave portion is formed in a curved surface portion of the cap skirt and a curved surface portion of the overcap, and an end of the elastic piece is joined by the concave portion. The cap for a wide-mouthed container according to any one of claims 4 to 4. 6. A distance (PI, PH) between a center point (R1, R2) defining an arc of the arc-shaped portion of the elastic piece and an extension of a swing axis (B) of the hinge body. , A factor (PI / LI, PH) determined by a distance (LI, LH) between an intermediate point (M) of the hinge body and a side surface of the elastic piece.
The cap of claim 1, wherein the value of (/ LH) is 0.01 to 0.9. 7. The hinge according to claim 1, wherein a joint surface between each end of the elastic piece and the corresponding cap skirt and the overcap is inclined toward the hinge body. A cap for a wide-mouthed container according to claim 1. 8. The wide-mouthed container according to claim 1, wherein a concave portion is formed on the upper surface of the hinge body along the pivot axis in a 180-degree opened state. cap.