JP2004136976A - Screw type lid structure, screw type lid section using the same, and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw type lid structure capable of easily opening the lid of a container, a screw type lid section using the same and a method for manufacturing the same. <P>SOLUTION: The screw type lid structure is provided with a cylindrical mouth section 22 having externally protruded spiral lines 24 on its periphery and the lid section 10 which blocks the section 22 having internally protruded spiral lines 14 internally protruding and spirally fitting into the lines 24. The lines 24 continuously run in a spiral direction, the lines 14 are provided with a plurality of main protruded lines 15 intermittently disposed in the spiral direction. In addition, sub protruded lines thinner than the lines 15 which connect adjacent main protruded lines 15 on the release side of the section 10 to form spirals may be provided. The lines 24 and the lines 14 may continuously run in the spiral direction to form a plurality of spaced-out recesses which are in non-contact with the external protruded lines in the spiral direction on the side closer to the sealed side of the section 10 out of the lines 24. <P>COPYRIGHT: (C)2004,JPO

Description

(4) The present invention relates to a screw-type lid structure used for opening and closing a container for storing foods and drinks such as honey and jam, a screw-type lid using the same, and a method of manufacturing the same. More specifically, a screw-type lid having a cylindrical mouth having a spiral outer ridge on the outer periphery and a lid closing the mouth having a spiral inner ridge protruding inward and screwing into the spiral ridge. The present invention relates to a structure, a screw-type lid using the same, and a method for manufacturing the same.

Conventionally, as a screw-type lid structure of a container for storing and preserving foods and the like, there is known a structure in which the container is sealed using a cap 100 called a “screw cap” shown in FIGS. The screw type lid structure includes a container 110 having an outwardly projecting helical screw 113 on an outer peripheral surface 112 of a container mouth 111 and a cap having an inwardly projecting helical screw 102 on a side wall inner peripheral surface 101 of the cap. 100, the helical screw 102 of the cap 100 is screwed into the helical screw 113 of the container 110, whereby the container mouth is sealed by the cap.

By the way, as shown in FIG. 12, the container sealed by the same structure is in a state where the lower side 113a of the helical screw of the container and the upper side 102a of the helical screw of the cap are completely in contact over almost the entire circumference of the screw. Become. As a result, the contact length between the screw between the cap and the mouth becomes longer, so that it becomes very difficult to open due to frictional resistance. In particular, when the inside of the container is in a vacuum state or when the contents are attached to the helical screw, the rotation resistance of the lid is considerably large.

On the other hand, in a cap called a “twist cap” shown in FIG. 13A, the claw portions 121 are provided at several places on the peripheral portion. On the other hand, the mouth 132 of the bottle 130 is provided with a plurality of screws (projections) 133 intermittently in the peripheral direction. The screw 133 has a shape protruding in the outer peripheral direction. When viewed from the side, the upper side 133a is inclined upward, the lower side 133b of the left end is horizontal, and the lower side 133b of the right end is horizontal. Each is formed so as to be inclined upward. Then, as shown in FIG. 13, the claw portion 121 of the cap is sandwiched between the adjacent screws 133 and 133 to cover the mouth portion 132.

According to this configuration, since the contact length (contact area) between the claw portion 121 and the screw 133 is small, the cap can be easily opened. However, since the length that can be engaged is short, high manufacturing accuracy is required for manufacturing the claw portion 121 and the screw 133, and quality control is difficult.

In addition, when listing other conventional techniques for reference, it is described that the "ink can" described in Patent Document 1 utilizes the elasticity of the lid to open the lid by releasing the engagement between the container body and the lid. ing. However, the technology does not form a spiral, and is a different technology from the present case.
JP 2000-272646 A

Further, in the “synthetic resin cap” described in Patent Literature 2, grooves are provided at equal intervals in the threads on the inner peripheral surface of the cap. However, such a groove is intended to release gas at the time of opening, and has a different purpose from the present invention.
JP-A-8-34455

In view of such a conventional situation, an object of the present invention is to provide a screw-type lid structure capable of easily opening a lid of a container, a screw-type lid portion using the same, and a method of manufacturing the same.

In order to achieve the above object, a first characteristic configuration of the screw type lid structure according to the present invention includes a cylindrical mouth having a spiral outer ridge on an outer periphery, a spiral projecting inward and screwing with the spiral ridge. In a structure having a lid for closing the mouth having an inner ridge, the spiral outer ridge is continuous in the spiral direction, and the spiral inner ridge is intermittently arranged in the spiral direction. It consists of multiple main ridges.

According to this characteristic configuration, when the mouth is closed, the contact area (contact area) between the spiral outer protrusion and the spiral inner protrusion is smaller than when the spiral inner protrusion on the lid side is continuous in the spiral direction. Length) can be reduced, and the resistance friction between the two can be reduced when the cover is opened and closed. In particular, this structure is suitable for a case where a lid formed by molding a metal plate is used for an opening made of glass or a hard resin. Due to the moderate elastic deformation of the lid when opening and closing, the resistance friction between the spiral outer ridge and the spiral inner ridge is easily reduced, and the processing of the ridge is easier with a metal plate than with glass etc. It is.

In the meantime, when the main ridges are intermittently arranged in the spiral direction, a mode in which discontinuous portions (separation portions) are provided by separating the main ridges adjacent in the spiral direction is also included. For example, in such an embodiment, when the lid is inclined by the automatic capper, the spiral outer ridge may start biting from a portion other than the separation portion where the height difference is the largest, and in this case, the screwing is performed normally. The inconvenience of not being able to do so may occur.

Therefore, in addition to the first characteristic configuration, a sub-projection that is thinner than the main projection for connecting the adjacent main projections on the release portion side of the lid to form a spiral is provided. Good. According to this feature, when screwing the spiral outer ridge and the spiral inner ridge, screwing is started from the open end of the spiral inner ridge, so that the lid is securely closed even by an automatic capper or the like. Can be.

に In addition to any one of the above-described features, it is preferable that the main ridge be disposed at a point symmetrical position with respect to the center axis of the lid when viewed in the direction of the helical central axis. According to this characteristic configuration, the forces from the spiral inner ridges acting on the main ridges on both sides of the helical central axis become substantially the same, so that the screw force balance is stabilized.

A second characteristic configuration of the screw-type lid structure according to the present invention includes a cylindrical mouth, a spiral outer ridge formed on an outer periphery of the mouth, a lid for closing the mouth, and a lid. And a spiral inner ridge that projects inward and is screwed into the spiral ridge. The spiral outer ridge and the spiral inner ridge are both continuous in the spiral direction, and the lid of the spiral inner ridge is A plurality of concave portions for non-contact with the outer ridges are formed on the side closer to the sealing portion side of the portion so as to be separated from each other in the spiral direction.

According to this feature, when the mouth is closed, the concave portion is not in contact with the spiral inner protrusion, so that the contact area (contact length) between the spiral outer protrusion and the spiral inner protrusion can be reduced. When the cover is opened and closed, the frictional friction between the two can be reduced.

The characteristic configuration of the screw type lid according to the present invention is used for the screw type lid structure according to any one of the above, wherein a plurality of main parts in which the spiral inner ridges are intermittently arranged in the spiral direction. It consists of ridges.

A feature of the method for manufacturing the screw-type lid according to the present invention is that, in the method for manufacturing the screw-type lid, a lid outer metal provided with a plurality of main protrusions intermittently arranged in a spiral direction. It is another object of the present invention to form a spiral inner ridge of the lid by inserting a plate material between a mold and an inner mold having a spiral for receiving the main ridge.

As described above, according to the first characteristic configuration of the screw-type lid structure according to the present invention, the contact area (contact length) between the spiral outer ridge and the spiral inner ridge is reduced, so that the lid can be easily formed. It became possible to open.

Further, by providing a sub-projection smaller than the main projection for connecting the adjacent main projections on the opening portion side of the lid to form a spiral, a screw is formed from the end of the spiral inner projection. Start a match. Therefore, the lid can be securely closed, and troubles particularly when the automatic capper is used can be prevented.

On the other hand, according to the second characteristic configuration of the screw-type lid structure according to the present invention, the concave portion is not in contact with the spiral inner ridge. Therefore, the resistance friction between the ridge and the screw can be reduced, and the lid can be easily opened and closed similarly to the first feature. In addition, the trouble of the automatic capper can be avoided at the same time.

の 他 Other objects, configurations and effects of the present invention will become apparent in the following embodiments of the present invention.

Next, the present invention will be described in more detail with reference to the accompanying drawings. First, a first embodiment of the screw-type lid structure according to the present invention will be described with reference to FIGS. In the present embodiment, a case will be described in which the mouth 22 of the glass bottle 20 that stores honey, jam, and the like is closed with the lid 10.

The lid 10 generally includes a disk-shaped sealing portion 12 and an annular side wall 11 hanging down from the peripheral edge of the sealing portion 12, and is rounded so that an edge 11 a at a tip end thereof protrudes in the outer peripheral direction of the side wall. . The side wall 11 has four protruding ridges 15a to 15d protruding on the inner surface side functioning as the spiral inner ridge 14. These four ridges are formed discontinuously along an inclined spiral trajectory from the sealing portion 12 side to the protrusion 11a side from the first ridge 15a in the side view direction to the fourth ridge 15d in order. Have been. The space between adjacent ridges is hereinafter referred to as first to fourth separation portions 16a to 16d.

In the present embodiment, these four ridges are arranged so as to be point-symmetric with respect to the central axis S1 when viewed in the direction of the spiral central axis S1 of the lid, and the first ridge 15a and the third ridge 15c are arranged. The second ridge 15b and the fourth ridge 15d are positioned so as to face each other via the spiral center axis S1. Further, a packing 13 is adhered to a peripheral edge of the inner surface 12a of the sealing portion 12 to abut and seal a mouth upper end 23 described later.

The bottle 20 generally includes a bottle body 21 and a mouth 22, and the bottle body 21 and the mouth 22 are integrally formed. A continuous screw (outer ridge) 24 protruding outward is formed on the outer peripheral surface of the cylindrical mouth portion 22. The screw 24 has a spiral shape inclined from the mouth upper end 23 toward the bottle body 21.

When closing the mouth 22 of the bottle 20 with the lid 10, the mouth 22 is closed by screwing the end of the first main ridge 15 a of the lid 10 to the screw 24 from the upper end side. FIG. 2 is a sectional view of a threaded portion between the main ridge 15 and the screw 24. As can be seen from the figure, the upper side 15x of the ridge 15 is in contact with the lower side 24b of the screw 24, and the lower side 24b of the screw 24 located on the separation portion 16 between the adjacent ridges 15 Is in non-contact. Therefore, since the frictional force acting when the lid 10 is opened is increased as the contact length (area) between the ridge 15 and the screw 24 is increased, the provision of the separating portion 16 enables The frictional force when opening can be reduced.

Here, the manufacturing apparatus and the manufacturing method of the screw-type lid according to the present invention will be briefly described with reference to FIG. First, a screw mold 30 having a spiral screw groove 31 on the side surface 30a is inserted into a concave portion of a plate material 10x that has been press-formed in a cap shape in advance. Then, the outer mold 35 having a plurality of convex portions 36 protruding outward on the side surface 35a is formed by pressing the outer mold 35 while rotating both of them while contacting the outer surface of the plate material 10x.

In the case where the screw-type lid in the first embodiment is formed, a plurality of the protrusions 36 are formed intermittently in the spiral direction. When the screw-type lid according to the following embodiment is created, it can be formed in the same manner by changing the shape of the projection 36.

Next, a second embodiment according to the present invention will be described with reference to FIGS. In the following embodiments, parts that are different from the above embodiment will be mainly described, and the same members as those in the above embodiment will be denoted by the same reference numerals.

The second embodiment according to the present invention is an invention made to solve the inconvenience of the screw-type lid structure in the first embodiment when closing the lid 22 of the container using a high-speed automatic capper. In the screw-type lid structure according to the first embodiment, when screwing is started from the first main ridge 15a to the opening-side end portion 25 of the screw 24 in order, the two are securely screwed. However, since the adjacent main ridges 15a to 15d forming the spiral inner ridges 14 are separated by the separation portions 16a to 16d, when the lid is tilted in the case of using the high-speed rotating automatic capper, the other main ridges 15a to 15d are separated from each other. Any of the protrusions 15b to 15d may be screwed into the end 25 of the screw 24 first. In such a case, the lid 10 is not completely screwed, causing trouble.

Therefore, in the lid portion 10 according to the present embodiment, a position corresponding to the separation portion 16 between the adjacent main ridges 15 is closer to the opening portion side of the lid portion than the main ridge for forming a spiral. Thin sub-projections 17a to 17c are provided. The sub-projection 17 is configured such that the lower side is connected to the main projection 15 so that the lid 10 can be screwed smoothly. Further, in the present embodiment, the width of the sub-projection 17 in the vertical direction is formed to be about １ ／ of the width of the main projection 15. As a result, since the contact area (contact length) between the screw 24 and the spiral inner ridge of the cap is the same as that of the first embodiment due to the presence of the concave portion 19, the lid 10 can be easily opened and closed, and furthermore, the automatic capper is provided. The lid can be securely screwed in even when using the.

Next, a third embodiment according to the present invention will be described with reference to FIG. As shown in FIG. 8A, the spiral inner ridge 14 of the lid 10 according to the present embodiment includes four main ridges 15 a to 15 d intermittently interposed between the spiral sub-ridges 17. , Exhibiting a continuous spiral structure as a whole. The sub-projections 17 located at both ends of the spiral inner projections 14 indicated by reference numerals 17d and 17e overlap in the direction of the lid rotation axis, so that the lid can be securely screwed even when an automatic capper is used. .

(4) The width of the main ridge 15 and the sub ridge 17 is substantially the same in a side view of the lid portion 10, and this point is also excellent in suitability of the automatic capper. The sub-projection 17 is formed such that the central portion thereof has a gentle and substantially triangular shape protruding toward the inner surface in the cross section of FIG. 8C, and does not contact the spiral outer projection 24. On the other hand, each of the main ridges 15a to 15d makes the upper side 15x project more steeply in the inner surface direction than the sub ridge 17 in the cross section of FIG. 8B, and the upper side 15x and the lower side of the spiral outer ridge 24. 24b are formed so as to be in contact with each other. In this way, the main ridges 15a to 15d are configured to protrude more largely than the sub ridges 17 on the upper side 15x, so that the concave portion 19 is formed between the main ridges 15a to 15d. By forming the upper side 17x of the sub-projection 17 more gently than the lower side y as shown in the figure, a larger concave portion 19 can be formed on the upper side 17x side. The main ridge 15 may be formed so that the entire height is deeper than the sub ridge 17.

Next, the possibility of another embodiment of the present invention will be described. In the above embodiment, the four main ridges 15 are formed on the side wall of the cap 10, but the number of the main ridges can be appropriately changed according to the diameter of the bottle, such as in the case of five as shown in FIG. However, as in the above-described embodiment, by arranging the even number of main ridges 15 point-symmetrically with respect to the central axis S1 in the helical central axis direction, the spiral ridges 24 acting on the main ridges 15 facing each other can be obtained. Are almost the same. As a result, the above-described embodiment is superior in that the force balance of screwing is stabilized.

In the second embodiment, the main ridges 15 and the sub-ridges 17 having different thicknesses are alternately and continuously arranged. However, as shown in FIG. May be formed. In this case, the ridge 15 comes into contact with the screw 24 of the container only at the corrugated top portion 15z, so that the lid can be easily opened. In addition, since there is no gap in the spiral direction, even when the lid is closed with an automatic capper or the like, it is possible to securely screw together.

In the above embodiment, the combination of the glass bottle as the container and the metal cap as the lid has been described. However, various combinations other than these materials are possible. For example, a cap made of a synthetic resin, such as a plastic bottle, may be used. However, when a hard material such as a glass bottle is used, if the lid is also made of a hard material, both materials are inflexible and it is difficult to open and close the lid. Therefore, it is desirable to use a lid made of an elastic material such as a metal cap as in the above-described embodiment.

The reference numerals in the claims are merely for convenience of comparison with the drawings, and the present invention is not limited to the configuration of the attached drawings.

ね じ It can be used as a screw-type lid structure for closing the mouth of a glass bottle or the like having a helical screw structure and a screw-type lid using this.

It is a figure showing the screw type lid structure concerning a first embodiment of the present invention, (a) is a perspective view of a screw type lid part, and (b) is a front view of a container. FIG. 2 is a cross-sectional view in a state where a mouth of a container is covered with a screw-type lid shown in FIG. 1. (A) is a bottom view of the screw-type lid shown in FIG. 1 (a), (b) is a side view, and (c) is a developed side view. It is explanatory drawing of the manufacturing method of the screw-type lid part concerning this invention. It is a figure showing the screw type lid structure concerning a second embodiment of the present invention, (a) is a perspective view of a screw type lid part, and (b) is a front view of a container. FIG. 6 is a cross-sectional view in a state where the mouth of the container is covered with the screw-type lid shown in FIG. 5. FIG. 6 is a side developed view of the screw-type lid shown in FIG. It is a figure which shows the screw type lid part concerning 3rd embodiment of this invention, (a) is a side view development view of a screw type lid part, (b) is XX sectional drawing of (a), (c) It is a YY sectional view of (a). It is a figure which shows the screw-type lid part concerning other embodiment of this invention, (a) is a bottom view, (b) is an expanded side view. It is an expanded side view of the screw type lid concerning another embodiment of the present invention. It is a figure which shows the conventional screw type lid structure, (a) is a perspective view of a cap (screw cap), (b) is a front view of a container. It is sectional drawing at the time of sealing the container in the screw-type lid structure shown in FIG. It is a figure which shows the conventional screw type lid structure, (a) is a top view of a cap (twist cap), (b) is a front view of a container.

Explanation of reference numerals

1: screw type lid structure, 10: lid portion, 10x: plate material, 11: side wall, 11a: edge portion, 12: sealing portion, 13: packing, 14: spiral inner ridge, 15: main ridge, 15a to d: first to fourth protrusions, 15x: upper side, 15y: lower side, 15z: top-like part, 16: separating part, 16a to d: first to fourth separating part, 17, 17a to e: Sub-protrusion, 17x: upper side, 17y: lower side, 19: recess, 20: container, 21: container body, 22: mouth, 23: upper end of the mouth, 24: spiral outer protrusion (spiral screw) , 24a: upper side, 24b: lower side, 25: end, 30: screw die, 31: screw groove, 32: rotary shaft, 35: molding die, 36: convex portion, 37: rotary shaft, 100 : Lid: 101: inner peripheral surface, 102: screw, 110: container body, 111: mouth, 112: mouth outer wall, 113: screw, 120: cover, 121 The claw portion, 122: Packing 130: a container, 132: mouth, 133: screw, 133a: upper side, 133b: lower side, S1: helical center axis

Claims (7)

A cylindrical mouth (22) having a spiral outer ridge (24) on the outer periphery; and a mouth (22) having a spiral inner ridge (14) projecting inward and screwing with the spiral outer ridge (24). And a lid (10) for closing the spiral. The spiral outer ridge (24) is continuous in the spiral direction, and the spiral inner ridge (14) is in the spiral direction. A screw-type lid structure comprising a plurality of main ridges (15) intermittently arranged. An auxiliary ridge (17) smaller than the main ridge (15) for connecting the adjacent main ridges (15) on the open portion side of the lid (10) to form a spiral is provided. The screw type lid structure according to claim 1. 3. The main ridge (15) according to claim 1, wherein the main ridge (15) is disposed in a point-symmetric relationship with respect to the central axis (S <b> 1) when viewed in a spiral central axis direction of the lid (10). 4. The screw-type lid structure according to 1. A cylindrical mouth (22), a spiral outer ridge (24) formed on the outer periphery of the mouth (22), a lid (10) for closing the mouth (22), and a lid ( 10) a screw-type lid structure including a spiral inner ridge (14) projecting inside and screwing with the spiral outer ridge (24), wherein the spiral outer ridge (24) and the spiral inner ridge are provided. The ridges (14) are both continuous in the spiral direction, and the helical inner ridges (14) are not in contact with the helical outer ridges (24) on the side closer to the sealing portion side of the lid (10). The screw type lid structure, wherein a plurality of concave portions (19) are formed at a distance from each other in the spiral direction. The said mouth part (22) and spiral outer ridge (24) consist of glass or hard resin, The said lid part (10) is formed by shaping | molding a metal plate, The any one of Claims 1-4 characterized by the above-mentioned. A screw-type lid structure according to Crab. The screw-type lid used in the screw-type lid structure according to claim 1, wherein the inner spiral ridge comprises a plurality of main ridges (15) intermittently arranged in a spiral direction. Screw-type lid. A method for manufacturing a screw-type lid for manufacturing the screw-type lid according to claim 6, comprising a plurality of main ridges (15) intermittently arranged in a spiral direction. A spiral inner ridge of the lid is formed by inserting a plate (10x) between (35) and an inner mold (30) having a spiral for receiving the main ridge. Manufacturing method of screw-type lid.

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