JP3048662B2 - Synthetic resin snap hinge - Google Patents

Abstract

Two parts (1, 2) are joined together, on the one hand, via a single-part or multi-part main hinge (3) and, on the other hand, via a snap-action bending element (4). The bending element (4), in turn, is linked via film hinges (41) to the part (1) and via a film hinge (42) to a second part (2). The bending element has a multi-folded shape which is such that there is always a straight line which penetrates the resilient bending element at at least three different points. The construction allows plastic closures to be designed with a flat cap (2) with an extremely large opening angle and a strong snap action. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial application] Synthetic resin snap hinge is large 2
The present invention relates to the latter plastic snap hinges, which are divided into two types, namely those in which the snap action is generated by a tension element and those which are generated by an elastic bending element.

[0002]

2. Description of the Related Art U-shaped or L-shaped elastic bending elements are known. The dimensions of this bending element are mainly related to the desired elastic deformation distance and spring force. However, there are other peripheral conditions that significantly affect the geometric shape of the plastic snap hinge, especially when employed in plastic lids. Especially in the case of lids with very large spouts and very flat ceilings, the known bending elements cannot be employed.
In the case of an L-shaped bending element, the legs of the bending element, which extend over the ceiling surface of the cap, cannot be formed long enough because they project into the sealing area of the spout. In the case of a U-shaped bending element, the bending element cannot be formed sufficiently large. Because the small cap height does not provide enough space to accommodate the bending element.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to form a bending element which can be used for the above-mentioned applications.

[0004]

According to the invention, this object is achieved by means of the characterizing part of claim 1. Advantageous embodiments of the invention are described in the other claims.

[0005]

1 to 5 show one small spout 3;
A synthetic resin lid applied to a synthetic resin container 30 having only one is shown. Such containers are used in particular for cosmetics which apply directly to the skin, such as, for example, sun creams and body lotions. This provides that the cap 2 of the lid is pivoted at least 180 ° with respect to the closed position. The lid comprises a lower part 1 and a cap 2, which is pivotally connected to the lower part via two first thin hinges 3 arranged in a straight line. This first thin hinge 3 is
By being formed thinner than the cap 2 and the cap 2, flexibility is imparted, and by bending at this portion, it functions as a hinge. Between these two thin hinges 3 is located a bending element 4 which generates the spring force required for the snap action.

The lower part 1 of the lid is merely an annular vertical side wall 1.
0, which has a flange 11 extending conically. Even in the closed state, there is a gap 12 between the cap 2 and the lower part 1. This gap 12 is necessary so that the lid can be injection molded in the closed state. The flange 11 in the area of the lower part 1 opposite the hinge 3 is recessed to form a grip recess 13. The grip recess 13 is provided so that the cap 2 can be moved upward from below with the thumb and over the unstable equilibrium position.
Can be pushed to the fully open position as shown in FIG. 4 until it is snapped open.

The sealing between the cap 2 and the spout 31 of the container 30 is performed by closing the injection pin 21 below the ceiling surface 20.
Has been done by The closing pin 21 is provided with one or a plurality of seal rings 22 in order to enhance the sealing performance and the holding force. The ceiling surface 20 is here formed concavely from above for visual reasons and to increase the strength. In order to determine the relative position between the cap 2 and the container 30, a plurality of support protrusions 23 are provided below the ceiling surface 20. These support projections 23 are in contact with the container 30 in the assembled state of the lid and in the closed position of the cap 2.

The bending element 4 has a cross section S as shown in FIG.
It is formed in a bent shape such that one straight line MN crosses at least three places in a sectional view. In the case of the present invention, the bending element 4 can be die-cut even with the lid closed. As shown in FIG. 2, the bending element 4 has an S-shaped cross section, which is composed of a U-shaped section and a subsequent inverted L-shaped section. The depression 40 of the U-shaped part is open upward and extends in the vertical direction, which is exactly the direction in which the mold of the forming tool is withdrawn. Therefore, when performing injection molding, in FIG. 2, if the die is removed in the vertical direction, such a synthetic resin lid can be manufactured by one molding. The bending element 4 is connected to the lower part 1 via two second thin hinges 41,42.
Are connected to the vertical side wall surface 10 and the ceiling surface 20 of the cap 2, respectively. The thin hinge 41, which forms the connection between the vertical side wall surface 10 and the bending element 4, is located approximately at the height of the upper edge of the container 30 when the lid is attached. A thin hinge 42 connects the cap 2 and the bending element 4.
As shown in FIG. 2 or FIG. 4, when the cap 2 is completely closed or when the cap 2 is completely opened by 180 °, the two second thin hinges 41 and 42 are connected to the first thin hinges 41 and 42.
Is separated from the thin hinge 3 by the same distance a. In the case of FIG. 2 or FIG. 4, the distance between the thin hinge 41 and the thin hinge 42 is about a · ａ2, which is the minimum. on the other hand,
As shown in FIG. 3, when the cap 2 is standing vertically, that is, when the hinges 41 and 42 are positioned vertically above and below each other, the distance between the thin hinge 41 and the thin hinge 42 is set. Is about 2a, which is the maximum. For this reason, in the state shown in FIG. 3 as compared to the state shown in FIGS. 2 and 4, the bending element 4 is elastically stretched, so that the cap 2 is moved from the equilibrium state in FIG. Or, it is biased toward one of the states of FIG. In this way, a snap action is added to the cap 2.

FIGS. 6 and 7 show different lid embodiments according to the invention. It has almost the same features as the lid shown in FIGS. 1 to 5 and described above. This lid is suitable for a container 30 'having a thick container neck 32 (shown in broken lines). The lower part 1 must therefore be formed such that it surrounds the container neck 32.
For this purpose, the side wall 10 of the lower part 1 which contacts the container 30 '
Is a ceiling surface 14 having an annular wall 15 oriented vertically downwards
It has. The annular wall 15 hermetically surrounds the container neck 32 of the container 30 '. A spout 16 is provided in the ceiling surface 14 of the lower part 1 inside the area bounded by the annular wall 15. It is further closed by pins 21 formed on the ceiling surface 20 of the cap 2. In this case, the sealing is not effected between the container and the cap, but rather between the lower part 1 and the cap 2 as is usual in plastic lids. Lower part 1
Does not allow the lid to be manufactured in a closed state. It is injection molded in the fully open state as shown in FIG. This is possible because the bending element 4 is arranged such that the bending element 4 can be cut out even when the lid is completely opened. The recess 40 visible from the outside when the lid is closed is now located on the side wall 10 of the lower part 1. Moreover, in the fully opened position, the bending element 4 is flipped outward by 90 ° about the hinge joint 41. The recess 40 extends vertically downward, and thus extends parallel to the side wall 10 in the direction in which the mold is extracted.

In this embodiment, a bending element having the same geometric shape is used. Although only general and most utilized shapes are shown herein, the concepts of the present invention are generally set forth. It is self-evident that it is not necessary to extend the parts of the bending element in parallel. This means that a V-shaped part can be employed instead of a U-shaped part. Here, the portion extending straight can also be curved.
In principle, the bending element 4 is formed in the form of a bellows with repeated bending and therefore always has a straight line passing through the bending element at three different points. Only bending elements that fulfill this geometrical condition guarantee a bellows-like shape that allows them to stretch significantly in small spaces, and guarantee a large force for the snap action.

[0011]

A bending element of a synthetic resin snap hinge which can be applied to a lid having a very large spout and a flat ceiling is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a synthetic resin lid having a snap hinge according to the present invention.

FIG. 2 is a sectional view through a bending element in a closed state of a lid in FIG. 1;

FIG. 3 is a sectional view of the lid in a half-open state.

FIG. 4 is a cross-sectional view of the lid in a fully opened state.

FIG. 5 is a cross-sectional view of the lid in FIG. 1 over a container.

FIG. 6 is a cross-sectional view of a synthetic resin lid of a different embodiment in a closed state.

FIG. 7 is a cross-sectional view of the lid in FIG. 6 in a fully opened state.

FIG. 8 is an enlarged view of a bending element part in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower part 2 Cap 3 Thin hinge 4 Bending element 10 Side wall of lower part 20 Ceiling surface 30 Container 40 Depression

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 2-45266 (JP, U) JP-A 50-126602 (JP, U) JP-A 56-143369 (JP, U) (58) Survey Field (Int.Cl. ⁷ , DB name) E05D 1/02-9/00 E05F 1/10-1/14

Claims (6)

(57) [Claims] At least one first thin hinge (3)
A lower portion (1) and a cap (2) coupled via a lower portion (1) and the cap (2), and the lower portion (1) and the cap Bending element (4) coupled to (2) and a second thin hinge (41, 42), respectively, to generate a snap action
Wherein: a) said first thin hinge (3) is, in cross-section,
Located on the outer circumference or in cross section of said lower part (1) or said cap (2), b) said bending element (4) is provided between said two second thin hinges (41, 42) And attached to the side wall (10) of the lower part (1) and the ceiling surface (20) of the cap (2) via these two second thin hinges (41, 42), respectively. A synthetic resin snap hinge characterized in that the bending element (4) is formed in a bent shape such that one straight line intersects at least three places in a sectional view. 2. The synthetic resin snap hinge according to claim 1, wherein the bending element has an S-shaped cross section. 3. The container according to claim 1, wherein the cap (2) directly seals a spout (31) provided in the container (30) when the lid is closed. Synthetic resin snap hinge. 4. The closure according to claim 1, wherein in a closed state of the lid, the cap (2) directly seals a spout (16) provided in a lower part (1) of the lid. Synthetic resin snap hinge according to any of the above. 5. A depression (40) in the bending element (4) having an S-shaped cross-section extending from the outside in the closed state of the lid and extending vertically, and a depression in the ceiling surface (20) of the cap (2). The synthetic resin snap hinge according to claim 3 or 4, characterized in that the hinge is visible. 6. In the closed state of the lid, the depression (40) in the bending element (4) having an S-shaped cross-section extending from the outside extends in the horizontal direction, and the circumferential surface (10) of the lower part (1). The synthetic resin snap hinge according to claim 3 or 4, wherein the hinge is visible.