JPH06219458A - Structure of hinge part of resin molded product - Google Patents

Abstract

(57) [Abstract] [Purpose] In the structure of the hinge part of the resin molded product composed of the rotating shaft and the bearing fitted on the outer periphery of the shaft, even if the shaft and the bearing wear, To obtain a structure of a hinge portion in which a gap is less likely to occur between the bearing and the bearing. [Structure] A rotating shaft formed of resin, and a bearing that is fitted to the outer periphery of the shaft and uses a resin material that is softer and more elastic than the resin material of the rotating shaft. Alternatively, a rotating cylindrical shaft formed of resin and a resin material that is fitted to the outer periphery of the shaft and is softer and more elastic than the resin material of the rotating shaft are used, and a hole for inserting the shaft is further used. Comprises a rectangular tubular bearing whose opposite side is smaller than the diameter of the shaft and whose diagonal is larger than the diameter of the shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a hinge portion of a resin molded product having a rotating shaft and a bearing fitted around the shaft.

[0002]

2. Description of the Related Art FIG. 4 is a front view showing the structure of a conventional hinge portion of a resin molded product, and FIG. 5 is a side view of FIG. 4 taken along the line EE. In FIGS. 4 and 5, a movable body 1 made of resin is integrally formed with a resin of the same material as the movable body 1, and a main body 2 made of resin is fitted into the outer circumference of the shaft 1A. And a bearing 2A integrally formed with each other form a hinge, and the movable body 1 rotates with respect to the main body 2. The shaft 1A and the bearing 2A are both made of the same resin material.

[0003]

In such a conventional structure, when the movable body 1 is frequently rotated, both the shaft 1A and the bearing 2A are worn because they are made of the same material, and a gap is formed in the hinge portion. Occurs, and the performance of the hinge is deteriorated. Therefore, an object of the present invention is to provide a structure of a hinge portion in which a gap between the shaft and the bearing is less likely to occur even when the shaft and the bearing are worn, and the performance is stable for a long period of time.

[0004]

In order to achieve the above-mentioned object, the present invention provides a structure of a hinge portion of a resin molded product which comprises a rotating shaft and a bearing fitted on the outer periphery of the shaft. The bearing is made of a resin material that is softer and more elastic than the resin material of the rotating shaft. Further, in this case, the rotating shaft is formed in a cylindrical shape, the bearing is in the shape of a rectangular tube, and the hole into which the shaft is inserted has an opposite side distance smaller than the diameter of the shaft and a diagonal distance smaller than the diameter of the shaft. Largely formed.

[0005]

According to the structure of the present invention, since the bearing fitted to the outer periphery of the rotating shaft is made of a softer and more elastic material than the material of the rotating shaft, the shaft pushes the bearing and spreads it out. Can be inserted. Therefore, even if the shaft and the bearing are worn, the elasticity of the bearing material restores the amount by which the shaft spreads the bearing, and a gap is less likely to occur between the shaft and the bearing.

[0006]

1 is a front view showing the structure of an embodiment of the present invention, and FIG. 2 is a side view of FIG. 1 taken along the line FF. Figure 1
In addition, in FIG. 2, a cylindrical shaft 1A is integrally molded with a resin made of the same material as the movable body 1 made of resin. A bearing 3 which is manufactured separately from the main body 2 and is molded from a resin material softer and more elastic than the resin material of the shaft 1A is fitted around the outer periphery of the shaft 1A, and the bearing 3 is fixed to the main body 2. ing.

FIG. 3 is an enlarged view showing the shapes of the shaft and the bearing as seen from the line GG in FIG. In FIG. 3, the shape of the hole into which the shaft 1A of the bearing 3 is inserted is formed in a rectangular tube shape in which the opposite side distance C is smaller than the diameter D of the shaft 1A and the diagonal distance H is larger than the diameter D of the shaft 1A. The cylindrical shaft 1A is designed to be inserted by expanding a part of the rectangular cylindrical hole of the bearing 3. With such a configuration, even if the shaft and the bearing are worn, the amount by which the elastic bearing is expanded by the shaft is restored, and a gap is less likely to be formed between the shaft and the bearing.

Further, although FIG. 3 shows an example in which the shape of the hole of the bearing is quadrangular, it may be polygonal.

[0009]

According to the structure of the present invention, even if the shaft and the bearing are worn, a gap is unlikely to be formed between the shaft and the bearing, and a structure of the hinge portion having stable performance for a long period of time can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing the structure of an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1 seen from the line FF.

FIG. 3 is an enlarged view showing the shapes of a shaft and a bearing when FIG. 2 is viewed from the line GG.

FIG. 4 is a front view showing a structure of a conventional example of a hinge portion of a resin molded product.

FIG. 5 is a side view of FIG. 4 seen from the line EE.

[Explanation of symbols]

 1 movable body 1A shaft 2 main body 3 bearing

Claims (2)

[Claims] 1. In a structure of a hinge portion of a resin molded product composed of a rotating shaft and a bearing fitted on the outer periphery of the shaft, the bearing is softer than the resin material of the rotating shaft and A structure of a hinge portion of a resin molded product, which is formed of a resin material having elasticity. 2. The shaft according to claim 1, wherein the rotating shaft is formed in a cylindrical shape, the bearing is a rectangular cylinder, and the hole into which the shaft is inserted has an opposite side distance smaller than the diameter of the shaft. A structure of a hinge portion of a resin molded product, wherein a distance is formed larger than a diameter of the shaft.