JPS6090148A - Snap type hinge device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a snap-type hinge device used, for example, as a bottle cap.

[Background]

In the present invention, two hinge parts are connected to each other by a main connecting part, both ends of at least 1-1 elastic connecting pieces are connected to both hinge parts by both side connecting parts, and the opening connecting part is
from an unstable equilibrium position, in a direction perpendicular to the axis of articulation, each at a distance from the main articulation, by means of which said hinge part is included in its pivot range, into one horizontal position or another end position; This invention relates to a snap-type hinge device integrally molded with synthetic resin, which moves in a snap-type manner. In this type of snap-type hinge device, the connecting portion that connects both hinge parts to each other and the elastic connecting piece to both hinge parts is formed by a synthetic resin material hoof 11 hinge. . For example, in the case of bottle caps, snap-on hinges have traditionally been manufactured solely from polypropylene, since they must withstand a large number of opening and closing movements during their lifetime. was. Other synthetic resins did not have sufficient stress resistance.

The snap hinge device described above is often used as a cap for a bottle or container. Polypropylene is relatively hard. If a backing cone formed integrally with the cap is used to seal the mouth of a bottle made of a fragile material, such as glass or polyvinyl chloride, there is a risk that the mouth of the bottle will be damaged when the cap is screwed on. Therefore, the snap-on hinge device is made from a material softer than polypropylene.
There is a demand for manufacturing in such a way that the snap function is not impaired.

Polypropylene also has poor stability with certain types of fillers, such as aromatic hydrocarbons, which precludes the use of polypropylene caps for storage of any type of filler.

〔assignment〕

There is a need in the art for a cap or spout or other snap-on hinge device that is resistant to the aforementioned materials and other materials that cannot be brought into contact with polypropylene in particular.

The main object of the invention is to provide a snap-on hinge device integrally molded from a soft synthetic resin having properties of the type mentioned at the beginning of the description and having a range of applications different from polypropylene.

[Solution]

[Background] In the snap-type hinge device of the type described at the beginning, the hinge device is made of low-density polyethylene (L).
DPE), the main connecting portion is formed as a strip made of a synthetic resin material, and the length of the strip is considerably larger than the thickness. Surprisingly, low-density polypropylene can withstand extremely high repetition rates of bending motion when a polyethylene band whose length is greater than its thickness is used in place of a traditional film hinge. was found to be resistant to This strip may thus have a considerably greater length than in conventional membrane hinges.

The main type of such snap-type hinge device 7Lr-Gun Sushi consists of a main connecting part consisting of two sections placed half a distance apart along the axis, and a single elastic connecting piece in the middle. It is equipped with However, it is also possible to adopt the opposite configuration, that is, to increase the width of the main connecting portion and to arrange two elastic connecting pieces on both sides thereof.

It is not obvious from the state of the art to form the joint as a strip. This is because with this configuration, there is no accurate axis. However, it has been found that the snap function is not lost even if the main joint becomes somewhat unstable. Like the conventional one, it has an open position and a closed position,
The hinge portion naturally snaps into one of these positions on either side of the unstable equilibrium position and is automatically held in this position.

The primary articulation, in many applications, pivots through an angle of about 180°, while the secondary articulation only needs to pivot through an angle of about 90°. Therefore, the construction type of the sub-connection and its sustained load capacity are not very important. According to a preferred embodiment of the invention according to claim 2, the secondary articulation is also formed as a strip, so that the sustained load capacity of the snap-on hinge device is even higher.

According to another preferred embodiment of the invention as defined in claim 3, good results are also obtained if the length-to-thickness ratio of the stripes is set to a certain value.

〔Example〕

Next, preferred embodiments of the present invention illustrated in the accompanying drawings will be described.

The snap hinge device comprises a lower part 2 and a lid 4. These lower parts and the lid are connected to each other by a main connecting part 6, and the main connecting part 6 includes two main connecting pieces 6a and 6b along the main axis, as shown in FIG. There is. According to FIG. 3, the elastic connecting piece 8 in the form of an angular spiral spring is arranged between the two main connecting pieces 6a, 6b.

The elastic connecting piece 8 is connected to the lower part 2 and to the lid 4 by a secondary abutment 10.12.

In FIG. 4, the configuration is reversed. There is only a single main articulation 6 and on both sides of the main articulation 6 there are in this example two
arc-shaped elastic connecting pieces 8a.

8b, and the elastic connecting pieces 8a, 8b are the secondary welding parts 10.1.
2 is connected to the lower part 2 and the lid 4.

When the lid 4 is pivoted from the illustrated open position towards the lower part 2, the elastic connecting piece 8 is elastically deformed. Connecting piece 8
acts like a tension spring. The snap hinge device reaches an unstable equilibrium position in which the axis of the main articulation 6 and the axis of the secondary articulation are contained in a common plane approximately in the middle of its pivot path. From this position, the lid 4 snaps into the closed position or returns to the open position.

In the known technology, as shown in FIG.
Since the secondary contact part 10.12 is formed as a thin-film hinge, the length of the connecting part 6.10.12 in the direction perpendicular to the pivot axis is short. On the contrary, the main joint 6'' in FIG.
It is 8 times more. For example, the strip 16 can have a thickness of 0.3 mm and a length of 1 to 2 mm. By-birth part 10', 1
The same length-to-thickness ratio applies when forming the 2" strips as strips.

[Brief explanation of drawings]

1 is a partial cross-sectional view showing a snap-type hinge device according to the invention taken in a direction perpendicular to the articulation axis; FIG.
Figure 3 is a similar partial cross-sectional view of a conventional snap-type hinge device; Figures 3 and 4 are perspective views showing a conventional snap-type hinge device with a main joint and a secondary joint according to the present invention; It is a diagram. Explanation of the sign 260. Lower part (hinge part). 499. Lid (hinge part). 6°0. Main connection. 819. Elastic connection piece. 169. band. Applicant: Zener Plastique Köhn, Grebner Land Co., Patent Attorney: Asami KatoFIG, 1 11. I FIG, 2 FIG, 3 Mu FIG, 4

Claims (1)

Claims: 1) a) the two hinge parts are connected to each other by a main joint, b) both ends of at least one elastic joint are connected to both hinge parts by double-sided joints, and C) the two hinge parts are connected to each other by a main joint; the opening abutments are each at a distance from said main articulation in a direction perpendicular to the pivot axis, d) whereby said hinge part is moved from an unstable equilibrium position included in its pivot range to one end position; or another end position, the snap-type hinge device is made of integrally molded synthetic resin, the snap-type hinge device being made of low-density polyethylene (LD);
PE), and f) the main connecting part (6”) is formed as a strip (16) made of synthetic resin material, and the strip (16) is made of synthetic resin material.
6) A snap-type hinge device characterized in that its length is considerably larger than its thickness. 2) The snap-type hinge according to claim 1, characterized in that the open contact portions (10', 12'') are formed as strips (18, 20) whose length is considerably larger than their thickness. 3) A snap-type hinge device according to claim 1 or 2, characterized in that the length of the strip is 3 to 8 times, preferably about 6 times, the thickness of the strip.