JP2001056011A - Parts mounting structure - Google Patents

Abstract

(57) [Problem] To improve a structure in which molded parts such as a cover and a case of a printer or the like are fastened with self-tapping screws so that they can be reused any number of times. SOLUTION: It is possible to easily recycle parts by using small separate parts 10 separately molded in screw holes of parts 11 and replacing the different parts 10 when the parts 11 are reused. A stepped hole 12 is formed in the part 11 for attaching another part 10. The separate component 10 also has a stepped shape, and is attached to the component 11 from a direction opposite to the direction in which the tapping screw 3 is attached.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component mounting structure for fastening components using a self-tapping screw, and more particularly to a component for facilitating recycling of a component when a thread is damaged.

[0002]

2. Description of the Related Art In printers and the like, a structure in which a cover is attached to a main body frame, which is a resin molded member, by self-tapping screws is often used. FIG. 1 is a perspective view showing an example of this type of conventional component mounting structure. As shown in FIG. 1, when the molded resin component 1 is to be fastened to the component 2 with the self-tapping screw 3, the component 2 has a long hole in consideration of the alignment accuracy with the screw hole 4 of the component 1. 5 and
Generally, the tapping screw 3 is screwed in from the component 2 side.

However, in such a structure, even if the mechanical parts of the printer have reached the end of their service life, the exterior parts such as the main body frame and the cover are reused instead of discarding the entire parts. However, even if an attempt is made to reuse the main body frame, the cover, or the like, the inner surface of the mounting hole formed in the mold member is often damaged due to repeated screwing and removal of the screw, and cannot be reused.

When the mounting hole of the mold member is damaged, the mold member and other members are joined using an adhesive, or the inner surface of the mounting hole is cut with a reamer or the like to make the mounting hole usable again. Although there are examples, the bonding work and the reaming work are very troublesome.

[0005] In the example disclosed in Japanese Patent Application Laid-Open No. 10-259810, a plurality of holes having different diameters are formed in a multi-stage in a molded part, and when reused, screws which are sequentially used in larger screw holes are used. However, since the number of engagements between the screw and the screw thread is smaller than usual, there is a trouble that the screw is easily loosened and that various types of screws must be prepared. Further, there is an inconvenience that only the number of holes formed in multiple stages can be reused.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to propose a component mounting structure that can be easily replaced many times.

[0007]

According to a first aspect of the present invention, there is provided a component mounting structure in which parts are fastened with self-tapping screws to achieve the above object. Another feature is that a separate component for forming a screw hole can be replaced in a portion where the thread is cut by the tapping screw when attaching another component.

According to a second aspect of the present invention, in order to achieve the above object, the separate component is formed in a shape that cannot rotate around the axis of the tapping screw.

According to a third aspect of the present invention, in order to achieve the above-mentioned object, the separate component is provided with a rotation stopper for preventing the separate component from rotating around the axis of the tapping screw. And

According to a fourth aspect of the present invention, in order to achieve the above object, the separate component is provided with a snap-fit member for attaching the separate component to the one component by snap-fitting. .

According to a fifth aspect of the present invention, in order to achieve the above object, the separate component has a shape that can be inserted into the one component from a direction in which the tapping screw is assembled.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. In the following, portions common to the related art are denoted by the same reference numerals, and redundant description is omitted. FIG. 2 is a perspective view showing a first embodiment of the component mounting structure according to the present invention. As shown in the figure, in the present embodiment, a small separate component 10 separately formed in the screw hole portion is used, and when the component 11 is reused, the separate component 10 is replaced, so that the component can be easily recycled. The component 11 is basically the same as the component 1 of FIG. 1, but has a stepped hole 12 for attaching another component 10 as shown in FIG. 3. The other component 10 also has a stepped shape as shown in FIG. 2, and is attached to the component 11 from a direction opposite to a direction in which the tapping screw 3 is attached.

FIG. 4 is a perspective view showing a second embodiment of the component mounting structure according to the present invention. If the shape is such that it can rotate around the axis of the tapping screw 3 as in the separate part 10 of the first embodiment, it may rotate with the tapping screw 3 during assembly, making it difficult to cut the screw. . Therefore, the separate component 20 of the present embodiment has a stepped quadrangular outer shape that cannot rotate as shown in the figure. Needless to say, the stepped hole 12 formed in the component 11 is also formed in a square shape corresponding to another component 20.

FIG. 5 is a perspective view showing a third embodiment of the component mounting structure according to the present invention. In the case of the separate components 10 and 20 of the first and second embodiments, when the screws are actually assembled, they must be held from behind the components 11 so as not to fall. Therefore, another component 3 of the present embodiment
No. 0 is provided with the snap-fit members 31, 31 so that the snap-fit members 31 are not removed from the component 11 even when pressed when the tapping screw 3 is assembled.

FIG. 6 is a perspective view showing a fourth embodiment of the component mounting structure according to the present invention. In the case of the above-described embodiment, all of the separate parts 10, 20, and 30 are attached to the stepped holes 12 from behind the part 11, but in this embodiment, as shown in FIG. Then, the direction of the stepped hole 12 is reversed from the above-described embodiment,
The separate component 40 can be mounted from the mounting direction of the tapping screw 3. The separate part 40 is basically the same as the separate part 30 of the third embodiment,
1 and 31 are provided so that they are not removed from the component 11 even if they are pushed when the tapping screw 3 is assembled. With this structure, the worker does not need to put his / her hand behind the component 11 to mount another component, thereby improving workability.

[0016]

According to the first aspect of the present invention, as described above, a screw hole is formed in a portion where a thread is cut by a tapping screw when one component is fastened to another component by the tapping screw. Since it is possible to replace a different part for forming a part, there is an effect that even a part formed by molding, which has been difficult to reuse until now, can be reused any number of times using another part which can be easily replaced.

In the component mounting structure according to the second aspect, as described above, the separate component has a shape that cannot be rotated around the axis of the tapping screw. There is an effect of improving.

In the component mounting structure according to the third aspect, as described above, since a separate component is provided with a rotation stopping portion that makes it impossible to rotate around the axis of the tapping screw, a common feature with the first aspect is provided. In addition to the effect, there is an effect that workability at the time of assembly is improved.

In the component mounting structure according to the fourth aspect, as described above, the snap-fit member is provided to be mounted on another component by snap-fitting. This has the effect of improving the workability.

As described above, the component mounting structure according to the fifth aspect has a shape that allows another component to be inserted into the component from the direction in which the self-tapping screw is to be assembled. Easier,
There is an effect that the working efficiency is further increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a conventional component mounting structure.

FIG. 2 is a perspective view showing a first embodiment of the component mounting structure according to the present invention.

FIG. 3 is an enlarged sectional view of the same.

FIG. 4 is a perspective view showing a second embodiment of the component mounting structure according to the present invention.

FIG. 5 is a perspective view showing a third embodiment of the component mounting structure according to the present invention.

FIG. 6 is a perspective view showing a fourth embodiment of the component mounting structure according to the present invention.

FIG. 7 is an enlarged sectional view of the same.

[Explanation of symbols]

 1, 2, 11 parts 3 self-tapping screws 4 screw holes 5 long holes 10, 20, 30, 40 separate parts 12 stepped holes 31 snap-fit members

Claims (5)

[Claims] In a component mounting structure in which components are fastened with a tapping screw, a screw hole is formed in a portion of one component where a thread is cut by the tapping screw when another component is mounted. A component mounting structure characterized in that components can be replaced. 2. The component mounting structure according to claim 1, wherein said another component has a shape that cannot rotate around the axis of said tapping screw. 3. The component mounting structure according to claim 1, wherein said another component is provided with a rotation stopping portion for preventing said another component from rotating around the axis of said tapping screw. 4. The component mounting structure according to claim 1, wherein said another component is provided with a snap-fit member for attaching said another component to said one component by snap-fitting. 5. The component mounting structure according to claim 1, wherein said another component has a shape capable of being inserted into said one component from a direction in which said tapping screw is assembled.