JP2005035628A - Hinge structure of cap with lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To give a turning property with a large opening degree to a hinge interconnecting a cap body to a lid as well as to improve the durability of the hinge, in a hinge structure of a cap with a lid. <P>SOLUTION: In the synthetic resin cap with a lid wherein the mutual outer walls of a cylindrical cap body 1 and the bottomed cylindrical lid 2 covering the cap body are integrally connected with a hinge 3, the hinge 3 comprises one rigid main hinge 4 having a foldable groove 6 and substantially evenly thin elastic films 5, 5 each connected to the opposite sides of the main hinge and connected to the respective outer walls of the cap body and the lid, and the elastic films are formed to be substantially linear in the open state of the lid and slightly curved in a closed state. Circular through holes 7 are formed near the ends of the foldable groove 6 in each elastic film 5. Stable folding is performed with the rigid main hinge 4, and the turning property with a wide opening is provided with the elastic films 5, absorbing distortion occurring at the elastic films when the lid is opened and closed with the circular through hole 7. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cap with a lid made of a synthetic resin that fits into a mouth of a container or the like, and more particularly to an improvement in a hinge structure that connects a lid and a cap body.

  A cap with a lid made of a synthetic resin that fits into the mouth of a container such as a bottle is convenient because there is no need to search for the lid removed from the mouth after the lid is opened and the liquid in the container is used. However, depending on how the lid and the cap body are connected, it may take time to open and close the lid or reduce the degree of opening of the lid. When the lid is connected to the mouth side, the lid obstructs the pouring of liquid or the like when the degree of opening of the lid is small, and it is difficult to check the amount of liquid or the like poured out.

Accordingly, the present inventors have developed a hinge structure for a cap with a lid that can move the lid between the closed position and the open position with momentum, and can ensure a large opening when the lid is opened. (See Patent Document 1).
JP 2001-233367 A

According to the above prior art, there is an advantage that the lid can be easily opened and closed and a large opening can be obtained when the lid is opened, but further improvement in durability has been desired.
The present invention has been made in view of the above demands, and an object of the present invention is to provide a hinge structure of a cap with a lid that can improve durability without losing the above-described advantages.

  In order to achieve the above object, according to the first aspect of the present invention, a substantially cylindrical cap main body and an outer wall of a bottomed substantially cylindrical lid covering the cap main body are integrally connected by a hinge. A cap with a lid, wherein the hinge is joined to one rigid main hinge, both sides of the main hinge, and both sides are joined to the cap body and the outer wall of the lid, respectively. The main hinge has a groove that is bent in a direction crossing at an intermediate position between the cap body and the lid on the flat surface when the lid is in an open state, and the upper surface is a substantially flat surface. Each having a side surface defined by a surface orthogonal to the folding groove on both sides, and each of the elastic membranes has one end portion on the side surface of the main hinge when the lid is open. Along the flat surface of the main hinge The other end portion is located at a portion inclined downward and outward from the one end portion, and the other end portion is substantially linear when the lid is open, and is slightly curved outward when the lid is closed. In the elastic membrane, in the vicinity of the end of the bent groove on the extended line of the bent groove, a thin part or a transparent part including a circular shape and an elliptical shape formed by a curved line at the edge is formed. Each of the holes is formed.

  According to a second aspect of the present invention, in the hinge structure of the cap with a cap according to the first aspect, the thin portion or the through hole is circular, the elastic membrane has a joining length of 2 mm to 3 mm with the side surface of the main hinge, and the cap When the joining lengths of the main body and the outer wall of the lid are 4 mm to 6 mm, respectively, the circular diameter is 0.3 mm to 1.0 mm.

  According to the hinge structure of the present invention (Claim 1), when the lid is closed so as to cover the cap body (see FIG. 8), in the center of the rigid main hinge 4, along the direction intersecting with the connecting direction of the hinges. And folded around the bending groove 6 (trajectory R1). The elastic film 5 having a substantially uniform thickness located on both sides of the main hinge 4 is rotated around the folding groove 6 in the vicinity of the main hinge 4, but the elastic film 5 is substantially uniform in the vicinity of the outermost end. So it will bend all over. Further, the outermost edge 5A of the elastic film 5 has a rotation trajectory (R2) around the bending groove 6 and a rotation trajectory R3 of the outer edge of the elastic film 5 where a portion connected to the cap body 1 is assumed to be a fixed position. Take a compound trajectory with. Here, since the locus R3 is located inside the locus 2 with the folding groove 6 as the center, the elastic film 5 rotates while being tensioned to a certain angle (thought point), and after that point, the tension disappears and the lid is removed. 2 is located so that the cap main body 1 upper direction may be covered. After that, if the lid 2 is pressed against the cap body 1 with a finger, the lid 2 is engaged and fixed to the cap body 1 while covering the cap body 1. In this state, the outermost edge 5A of the elastic film 5 is curved outward.

When the lid 2 is opened, if the lid 2 is opened to a degree slightly exceeding approximately 90 degrees, the portion of the elastic film 5 that contacts the arc-shaped outer wall of the lid 2 or the cap body 1 and the side surface of the main hinge 4 is hardly distorted. Since it is a part, when it passes through the thought point resulting from the trajectory difference of the elastic film 5 by the other elastic film part, the reversing force automatically opens up to an opening range of around 170 degrees at a stretch. Become. In this state, the outermost edge 5A of the elastic film 5 is substantially linear. In FIG. 8 (FIGS. 5 and 6), since the opening is about 180 degrees, the outermost edge 5A of the elastic membrane 5 has a slightly warped arc shape.
The lid 2 can be easily opened and closed by the action of the hinge structure (mainly the elastic films 5 and 5) accompanying the opening and closing of the lid 2 as described above.

  A thin part such as a circle or an ellipse formed in the vicinity of the end of the bending groove on the extension line of the bending groove 6 or the through-hole 7 of the elastic film 5 is distorted in the elastic film 5 when the lid 2 is opened and closed ( When stress occurs, it deforms and absorbs the strain. Therefore, the concentration of stress on a specific portion of the elastic film 5 can be alleviated, and the durability of the elastic film 5 and thus the hinge is enhanced.

  In the hinge structure according to claim 2, the thin portion or the through hole is circular, the joining length L1 (see FIG. 4) with the side surface of the main hinge is 2 mm to 3 mm, and the joining length with the cap body and the outer wall of the lid When the circular diameter is 0.3 mm to 1.0 mm for the elastic film 5 having a thickness L2 (see FIG. 4) of 4 mm to 6 mm, good durability is obtained for the elastic film.

According to the first aspect of the present invention, the hinge is bent around a bending groove formed on the rigid main hinge, and the elastic film integrally joined to the rigid main hinge follows this movement. It is bent at the center. When opening the lid, the difference between the rotation trajectory on the lid side and the outermost edge rotation trajectory of the elastic membrane causes a sudden rotation when the thought point is exceeded, and a large opening of around 170 degrees is obtained. It becomes convenient to.
In addition, in a hinge provided with such an elastic film, the shape of the elastic film formed by a curved line at the edge, including a circle and an ellipse, in the vicinity of the end of the bent groove on the extended line of the bent groove A thin portion or a through hole was formed. Therefore, when a strain (stress) is generated in each elastic film during opening and closing of the lid, the thin portion or the through hole can be deformed to absorb the strain, and the durability of the hinge can be enhanced.
According to the second aspect of the present invention, good durability can be obtained for the elastic film (the elastic film whose dimensions are specified) of the hinge structure of the actual cap with lid.

Embodiments of a hinge structure for a cap with a lid according to the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol shows the same or equivalent part between each figure referred in this specification.
1, 2 and 3 are a right side view, a rear view and a plan view showing an example of a cap with a lid to which the hinge structure of the present invention is applied.
The illustrated cap is integrally formed of polyethylene synthetic resin or polypropylene synthetic resin. As shown in the figure, the cylindrical cap body 1 and the cylindrical portion covering the cap body 1 have the same diameter as the cap body 1. The bottomed cylindrical lid 2 is connected by a hinge 3 integrally joined to the outer wall.

The hinge 3 includes a single rigid main hinge 4 and elastic films 5 and 5 integrally formed on both sides of the main hinge 4. The elastic films 5 and 5 are shown in FIG. As described above, both side portions are integrally joined to the outer wall of the cap body 1 and the lid 2, respectively.
As shown in FIGS. 4 to 7, the main hinge 4 is formed so that the top surface of the main hinge 4 becomes a substantially flat surface when the lid 2 is opened, and the cap body is formed on the flat surface. A bending groove 6 is formed in a direction crossing at an intermediate position between 1 and the lid 2.
Further, as shown in FIG. 5, the lower surface of the main hinge 4 is formed in an inverted V shape that is inclined from the mounting position toward the back surface of the bending groove 6. That is, the cross section of the main hinge 4 has a shape in which two substantially right triangular prisms are butted. Since FIG. 5 is an enlarged view, the lower surface of the main hinge 4 is drawn in a trapezoidal shape, and it is difficult to say that the cross section of the main hinge 4 necessarily has a shape in which two substantially right triangular prisms are butted. According to the naked eye, it has a substantially inverted V shape, and has a shape in which two substantially right triangular prisms are butted. The hinge 3 is opened and closed exclusively around the bending groove 6 of the rigid main hinge 4.

Each elastic film 5 has one end portion integrally joined to each side surface of the main hinge 4 in a direction along the upper surface (flat surface) of the main hinge 4, and the other end portion of the lid 2. In the open state, the entire surface is inclined downward and outward, and its outermost edge (the other end) 5A is curved horizontally or slightly upward in a side view (see FIG. 6).
Each elastic film 5 is a thin plate having a substantially uniform thickness e, and effectively utilizes the elasticity of the material by making it thin, and has a substantially trapezoidal shape in plan view (FIG. 4). . Since each elastic membrane 5 is fixed between the side surface of the main hinge 4 and each outer peripheral wall of the cap body 1 and the lid 2, the portions in contact with the side surfaces and the outer peripheral wall are portions that are not easily distorted. The reversing operation accompanying the rotation of the lid 2 is assisted.

Each elastic membrane 5 is formed with a circular thin portion or through-hole, and here, a through-hole 7 is formed. The through-holes 7 and 7 are formed at symmetrical positions in the vicinity of the end of the bent groove on the extension line of the bent groove 6 with the bent groove 6 interposed therebetween.
The through-holes 7 and 7 are deformed when the elastic film 5 is strained (stress) when the lid 2 is opened and closed with respect to the cap body 1 and absorbs the strain. Accordingly, the concentration of local stress (to a specific portion) of the elastic film 5 is alleviated, and the durability of the elastic film 5 and thus the hinge is enhanced.
In the illustrated example, the through-holes 7 and 7 are formed at symmetrical positions with the bending groove 6 interposed therebetween, because the elastic films 5 and 5 having the same material, thickness, shape, dimensions and the like are illustrated in the bending groove 6 ( This is because, when it is formed symmetrically across the main hinge 4), it is considered that the strain (stress) generated in each elastic film 5 when the lid 2 is opened and closed is also generated symmetrically between the elastic films 5 and 5.
The optimum values such as the diameter of the through-holes 7 and 7 (diameter and thickness dimensions in the case of a thin part) and the distance from the end of the bending groove 6 are the material, thickness, shape and dimensions of the elastic film 5. Since it may vary depending on the factors, etc., it is selected as appropriate by experiments. According to the experiments by the inventors, the joining length L1 (see FIG. 4) with the side surface of the main hinge 4 is 2 mm to 3 mm, and the joining length L2 with the outer wall of the cap body 1 and the lid 2 (see FIG. 4). When the diameter of the circular through hole 7 was 0.3 mm to 1.0 mm for the elastic membrane 5 having a diameter of 4 mm to 6 mm, good durability was obtained for the elastic membrane 5.
The through-holes 7 and 7 do not necessarily have a circular shape, and may have a shape other than a circle, such as an ellipse, as long as the strain generated in each elastic film 5 when the lid 2 is opened and closed can be absorbed. However, if the edge portion has a corner portion, cracks and the like are likely to occur from the corner portion, so that at least the edge portion is shaped by a curved line. When the through-holes 7 and 7 are formed in an elliptical shape, whether the major axis direction is directed to the extending direction of the bent groove 6 or the direction orthogonal thereto may be determined by experiments or the like.
Even when the reference numerals 7 and 7 are formed as thin portions instead of the through holes, the same actions and effects as when the through holes are formed can be exhibited.

It is a right view which shows an example of the cap with a lid to which the hinge structure of this invention was applied. It is a rear view of a cap same as the above. It is also a plan view. It is an enlarged plan view of the state where the lid was opened in the hinge structure of the present invention. It is sectional drawing which follows the VV line of FIG. It is an enlarged side view of the hinge vicinity of FIG. It is an expanded sectional view which follows the VII-VII line of FIG. It is action | operation explanatory drawing of this invention hinge.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cap main body 2 Lid 3 Hinge 4 Main hinge 5 Elastic film 6 Bending groove 7 Through-hole

Claims (2)

A cap with a lid made of synthetic resin, in which a substantially cylindrical cap main body and an outer wall of a bottomed substantially cylindrical lid covering the cap main body are integrally connected by a hinge,
The hinge is composed of one rigid main hinge and an elastic film having a substantially uniform thickness joined to both sides of the main hinge and both sides joined to the cap body and the outer wall of the lid, respectively.
The main hinge is
In the open state of the lid, the opened upper surface becomes a substantially flat surface, and has a folding groove on the flat surface in a direction crossing at an intermediate position between the cap body and the lid, and a surface orthogonal to the folding groove. With both sides defined by
The elastic membranes are respectively
In the open state of the lid, one end portion thereof is joined to the side surface of the main hinge along the flat surface of the main hinge, and the other end portion is inclined downward from the one end portion. The other end is substantially linear when the lid is open, and is slightly curved outward when the lid is closed.
In the elastic membrane, thin portions or through-holes each having a shape formed by a curved line at the edge, including a circle and an ellipse, are formed in the vicinity of the end of the bent groove on the extended line of the bent groove. A hinge structure of a cap with a lid, characterized by comprising: The hinge structure of the cap with a lid according to claim 1,
The thin part or through hole is circular,
When the elastic membrane has a joint length of 2 mm to 3 mm with the side surface of the main hinge and a joint length of 4 mm to 6 mm with the cap body and the outer wall of the lid,
A hinge structure of a cap with a lid, wherein the circular diameter is 0.3 mm to 1.0 mm.

Images