JPH0344514Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention rotatably connects two plastic molded members, such as a main body having a storage section and a lid body that closes the storage section. , and relates to an integral hinge of a plastic molded product that is integrally molded with both molded members.

Prior Art Figures 6 and 7 show conventional examples.The integral hinge a shown in Figure 6 has the same thickness in cross section in the direction of rotation, and can be bent at any part. Furthermore, the integral hinge b shown in FIG. 7 had a linear bent portion c in the direction of the rotation axis.

Problems to be Solved by the Invention Among the above conventional examples, in the former example shown in FIG. When closed, the lid d is misaligned with respect to the main body e, and it is necessary to provide positioning means such as a stepped joint between the lid d and the main body e.

On the other hand, since the latter shown in FIG. 7 is bent at one bending part c, the positioning of the lid body d with respect to the main body e is done when closing, but it is repeatedly folded at only this one bending part c. Because it is bent, this bent part c
However, there was a problem in that it turned white due to fatigue and had a short lifespan.

Means and Effects for Solving the Problems The present invention has been developed in view of the above-mentioned problems, and the rotating shaft is fixed and the rotating member such as the lid is fixed in the closed state with respect to the fixed member such as the main body. The purpose is to provide an integral hinge for a plastic molded product that is well positioned and has improved repeated bending strength, and its configuration is as follows:
The integral hinge of the integrally molded plastic molded product is rotated by a planar bending part that can be bent at any position in the rotation direction and a linear bending part that is linearly bent in the rotation axis direction. The structure is arranged in the direction of the moving axis,
When the rotating member is rotated relative to the fixed member, it is gently bent at the planar bending portion, and bent at the linear bending portion with the rotating shaft fixed.

Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 5.

In the figure, 1 is a lid formed into a hollow double wall structure by blow molding, 2 is a mounting piece for attaching this lid 1 to the main body 3 side, and this mounting piece 2 is integrally molded by blow molding. They are connected by a living hinge 4. The attachment piece 2 is adapted to be attached to the outer surface of the main body 3 with a rivet 5. 6 is a hole for a rivet.

The above-mentioned integral hinge 4 has a planar bent portion 4a whose cross-sectional shape in the rotation direction (X direction) has the same thickness, for example, 0.3 to 0.9 mm, and can be bent at any position.
Then, a folded line is provided in which the cross-sectional shape in the rotating direction becomes linear in the rotating axis direction (Y direction) by gradually thinning the wall thickness from both sides in the rotating direction (for example, 0.1 to 0.7 mm). Linear bent portion 4b bent along
are arranged alternately in the direction of the rotation axis. In particular, the linear bent portion 4b is thinner than the planar bent portion 4a (for example, the linear bent portion is 0.3 mm thick,
In terms of repeated bending strength and positioning of the rotating member, it is preferable to have a planar bent portion (0.6 mm). The two bent portions 4a, 4b have a long planar bent portion 4a in the middle portion in the rotation axis direction, and short linear bent portions 4b, 4b on both sides thereof. Further, as shown in FIG. 5, short planar bent portions 4a, 4a may be provided on the outside of the linear bent portions 4b, 4b on both sides.

In the above configuration, the lid 1 is attached to the main body 3 via the attachment piece 2. The lid body 1 is then rotated by an integral hinge 4. At this time, the integral hinge 4 is
It is gently bent into a planar shape at the planar bending part 4a, and bent linearly at the linear bending part 4b with the rotating shaft fixed.

Therefore, positioning of the lid 1 with respect to the main body 3 in the closed state is performed by the linear bent portion 4b. Further, the bending stress is dispersed in the planar bent portion 4a, and the linear bent portion 4b
The bending stress acting on the bending stress is reduced.

In the above embodiment, an example was shown in which the lid 1 is connected to the main body 3 via the mounting piece 2 connected by the integral hinge 4, but as shown in FIG. Alternatively, it may be directly connected to the main body 3' via the main body 3'.

In addition, the lid body 1 and the main body 3 are hollow 2 made by blow molding.
Although a heavy-walled structure is shown, the present invention is not limited to the above embodiments, and may include extrusion molding,
It may also be molded by other molding means such as injection molding.

In addition, materials constituting the plastic molded article according to the present invention include polyethylene, polypropylene, ethylene-vinyl acetate copolymer, styrene-vinyl acetate copolymer,
Thermoplastic plastics such as butadiene resins are used.

Effects of the invention According to the invention, the rotation axis is fixed and the main body 3,
The rotating members such as the lids 1 and 1' can be well positioned in the closed state with respect to the fixed members such as 3', and the repeated bending strength can be improved.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a perspective view, Figure 2 is a perspective view of the lid assembled to the main body, and Figure 3 is the same as Figure 1. 4 is an assembled sectional view taken along the line - in FIG. 1, FIG. 6
7 are perspective views showing a conventional example. 1 and 1' are the lid body, 2 is the mounting piece, 3 and 3' are the main body,
4, 4' are integral hinges, 4a is a planar bent part, 4b
is a linear bend.

Claims (1)

[Scope of utility model registration request] In an integral hinge of a plastic molded product in which one plastic member is rotatably connected to the other plastic member and integrally molded with both members, the integral hinge 4 can be folded at any position in the rotational direction. It is characterized by having a configuration in which a planar bending part 4a that is bendable and a linear bending part 4b that is bent along a linear bending line in the direction of the rotation axis are arranged in the direction of the rotation axis. Integral hinge made of plastic molding.