JPH05118176A - Synthetic resin snap hinge - Google Patents

Abstract

PURPOSE: To obtain a big spring force by forming a flexible element hinged to two parts for generating snap action into a shape constituted of at least one straight line as an element penetrating the element at least three points. CONSTITUTION: A lower side part 1 of a lid and a cap 2 are connected rotatably with each other with two film hinges disposed on a straight line. A plurality of flexible element comprising an L-shaped, U-shaped or V-shaped part are arranged between the hinges and the flexible elements are connected to the cap 2 and the lower side part 1 through two hinges 41, 42. By this constitution, a flexible element of a synthetic resin snap hinge that can be applied to a lid having a flat ceiling and a very large spout can be obtained.

Description

Detailed Description of the Invention

[0001]

[Industrial application] Large synthetic resin snap hinges
The present invention relates to the latter synthetic resin snap hinges, which are divided into two types, namely those in which the snap action is produced by a tension element and those in which an elastic bending element is produced.

[0002]

2. Description of the Prior Art Elastic bending elements which are U-shaped or L-shaped 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 geometry of the synthetic resin snap hinge, especially when employed in synthetic resin lids. Known bending elements cannot be employed, especially for lids with very large spouts and very flat ceilings.
In the case of an L-shaped bending element, the legs of the bending element, which extend on the ceiling surface of the cap, cannot be made long enough, because they project into the sealing area of the spout. In the case of U-shaped bending elements, the bending elements cannot be made sufficiently large. This is because the small cap height does not provide enough room to accommodate the bending element.

[0003]

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

[0004]

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

[0005]

1 to 5, one small spout 31 is shown.
A synthetic resin lid applied to a synthetic resin container 30 which has only one is shown. Such containers are especially utilized for direct skin cosmetics such as sunscreens and body lotions. This requires that the lid cap 2 be rotated at least 180 ° with respect to the closed position. The lid consists of a lower part 1 and a cap 2, which is arranged in line 2
Two film hinges 3 are pivotally connected to each other. Located between these two film hinges 3 is a bending element 4 which produces the spring force required for the snap action.

The lower part 1 of the lid is simply an annular vertical side wall 1
It consists of only 0 and has a conically extending collar 11. Even in the closed state, a gap 12 exists between the cap 2 and the lower portion 1. This gap 12 is necessary to allow the lid to be injection molded in the closed state. The collar portion 11 in the area opposite to the hinge 3 of the lower portion 1 is recessed to form a grip recess 13. The grip recess 13 is formed by moving the cap 2 from the bottom to the top with the thumb and beyond the unstable equilibrium position.
Allows it to be snapped into a fully open position as shown in FIG. 4 until it is opened.

The cap 2 and the spout 31 of the container 30 are hermetically sealed by the injection pin 21 under the ceiling surface 20.
Is done by. The closure pin 21 is provided with one or a plurality of seal rings 22 in order to enhance the sealing property and the holding force. The ceiling surface 20 is here concavely shaped from above for visual reasons and for increased strength. A plurality of support protrusions 23 are provided on the lower side of the ceiling surface 20 to determine the relative positions of the cap 2 and the container 30. These support projections 23 contact the container 30 in the assembled state of the lid and in the closed position of the cap 2.

In the case of the present invention, the bending element 4 can be stamped out even when the lid is closed. It has a U-shaped cross section,
Following that, the head is L-shaped. The U-shaped recess 40 extends exactly in the tool withdrawal direction. The bending element 4 is connected to the cap 2 via two hinge joints 41, 42.
To the lower part 1. The hinge joint 41 forming the connection between the side wall 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 hinge joint 42 connects the cap 2 to the bending element 4. As is clear from FIG. 4, both hinge joints 4
1, 42 are separated from the fixed film hinge 3 by the same distance. In the case of this arrangement structure, each hinge joint 41, 42
When the distance from the film hinge 3 to the film hinge 3 is a, the minimum distance between the hinge joints 41 and 42 is a.2. For example, in the unstable equilibrium position as shown in FIG. 3, the distance between the hinge joints 41 and 42 becomes maximum, which is just 2.a. This is the case when both hinge joints 41, 42 are located vertically above and below each other.

6 and 7 show different lid embodiments according to the invention. It has substantially the same features as the lid shown in FIGS. 1-5 and described above. This lid is suitable for a container 30 '(shown in phantom) having a thick container neck 32. Therefore, the lower part 1 must be formed such that it surrounds the container neck 32.
To that end, the side wall 10 of the lower part 1 which is in contact with the container 30 '
Is a ceiling surface 14 having an annular wall 15 vertically facing downward.
Is equipped with. The annular wall 15 hermetically encloses the container neck 32 of the container 30 '. A spout 16 is provided on the ceiling surface 14 of the lower portion 1 inside the area bounded by the annular wall 15. It is further closed by a pin 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 between the lower part 1 and the cap 2, as is customary in synthetic resin lids. Lower part 1
Of course, the ceiling surface 14 present in the above does not allow the lid to be manufactured in a closed condition. It is injection molded in the fully open condition as shown in FIG. This is possible due to the fact that the bending element 4 is arranged such that it can be shaped even when the lid is fully opened. The recess 40, which is visible from the outside in the closed state of the lid, is now located on the side wall 10 of the lower part 1. Moreover, in the position where the lid is fully opened, the bending element 4 is flipped up 90 ° about the hinge joint 41. The recess 40 extends vertically downward, and thus extends parallel to the side wall 10 in the mold withdrawal direction.

Also in this embodiment, bending elements of the same geometry are used. Although only general and most utilized shapes are shown herein, the inventive concept is generally described. It is self-evident that it is not necessary to unconditionally extend the parts of the bending element in parallel. This means that instead of the U-shaped part, V
It means that the glyph part can be adopted. It is also possible to bend the straight extension here. In principle, the bending element 4 is shaped like a harmonica, so that it always forms a straight line through the bending element at three different points. Only bending elements that satisfy this geometrical condition guarantee a harmonica-like shape that allows a large extension in a small space and a great force for the snap action.

[0011]

Advantages of the Invention A bending element of a synthetic resin snap hinge is obtained which can be applied to lids with very large spouts and flat ceilings.

[Brief description of drawings]

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

2 is a cross-sectional view through the bending element in the closed state of the lid in FIG.

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

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

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

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

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

[Explanation of symbols]

 1 Lower part 2 Cap 3 Film hinge 4 Bending element 10 Side wall of lower part 20 Ceiling surface 30 Container 40 Recess

Claims (7)

[Claims] 1. Two parts (1, 2) connected via at least one hinge (3) and both parts (1, 2).
A synthetic resin snap hinge comprising a bending element (4) hinged to 2) and generating a snap action, wherein the bending element (4) penetrates the bending element (4) at least at three points. A synthetic resin snap hinge, characterized in that it is shaped as formed by the bending element (4). 2. A synthetic resin snap hinge according to claim 1, characterized in that the bending element is composed of a plurality of L-shaped, U-shaped or V-shaped parts and guarantees a harmonica-like extension movement. 3. A one-piece synthetic resin lid having a lower portion (1) and a cap (2) connected thereto,
2. A plastic snap hinge according to claim 1, characterized in that the bending element (4) is mounted on the ceiling surface (20) of the cap (2) and on the side wall (10) of the lower part (1). 4. Synthetic resin snap hinge according to claim 3, characterized in that the bending element (4) is S-shaped in cross section. 5. A synthetic resin snap hinge for a solid or deformable container, wherein the lower part (1) surrounds the container neck (30) and the cap (2) directly seals the container spout (31). The synthetic resin snap hinge according to claim 4. 6. The indentation (40) in the bending element (4) having an S-shaped cross section, which is visible from the outside in the closed state of the lid, is visible as an indentation in the ceiling surface (20) of the cap (2). Item 5. A synthetic resin snap hinge according to item 5. 7. Synthetic resin snap hinge according to claim 4, characterized in that the recess (40) visible from the outside is visible on the cylindrical surface (10) of the lower part (1).