JP2000074016A - Mounting structure for thin type member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mounting structure for a thin type member capable of easily tightening it without generating a crack in the periphery of a prepared hole of a base by a simple constitution. SOLUTION: In a mounting structure 10 for a thin type member constituted by a base 11, thin type member 12 of leaf spring, circuit board, etc., which must be mounted to the base, and a tapping screw 13 inserted in a mounting hole 12a formed in the thin type member and screwed in a prepared hole 11a formed in the base, the mounting structure 10 for the thin type member is constituted in such a manner that the prepared hole formed in the base has at least one radially extended slit 11b, 11c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a thin member for mounting a thin member such as a thin substrate or a leaf spring of an electronic device to a resin base.

[0002]

2. Description of the Related Art In recent years, as electronic devices and the like have been reduced in size and thickness, substrates used for these devices have also been reduced in thickness. When attaching such a thin member such as a thin substrate or a leaf spring to a resin base, for example, an attachment structure as shown in FIG. 4 is generally used.

[0003] In FIG. 4, the mounting structure of the thin member includes a resin base 1, a thin member 2 such as a leaf spring or a thin substrate to be mounted on the base 1, and a thin member 2 attached to the base 1. And a tapping screw 3 to be fastened. According to the thin member mounting structure having such a configuration, the tapping screw 3 is inserted into the mounting hole 2 a provided in the thin member 2 and screwed into the prepared hole 1 a provided in the base 1 in advance. It is. Thereby, the thin member 2
Can be fixedly held to the base 1.

[0004]

However, the above-mentioned base 1 is generally made of a resin material such as PPS or LCP mixed with a glass filler or the like in order to increase its rigidity. Here, such a resin material generally has a property of being hard and brittle. Therefore, the tapping screw 3 is provided with the prepared hole 1a provided in the base 1.
When the screw is screwed into the base, the pilot hole 1a expands and deforms.
4A cannot be tolerated, and cracks 4 are formed around the prepared hole 1a as shown in FIG. For this reason, there has been a problem that the tightening force of the tapping screw 4 is reduced, and in some cases, the cracks 4 may be broken due to the progress of the cracks 4.

In order to prevent such cracks 4 from occurring, there is a method of strictly controlling the diameter of the pilot hole 1a in accordance with the diameter of the tapping screw 3.
However, there is a problem that the processing cost is increased.

On the other hand, for example, as shown in FIG.
A large hole 1b is opened in the base 1 in advance, a screw 5 is inserted from the mounting hole 2a side of the thin member 2, and a nut 6 is fitted to the tip of the screw 5 from the back side of the base 1, There is also a method of tightening 6. However, in this method, the screw 5 and the nut 6 are required, the number of parts is increased, and an operation of holding or rotating the nut 6 on the back side of the base 1 is required. There was a problem that would be.

SUMMARY OF THE INVENTION In view of the above, the present invention provides a thin member mounting structure in which a thin member can be easily fastened with a simple structure without cracks around a pilot hole of a base. It is intended to provide.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided, according to the present invention, a base, a thin member such as a leaf spring or a thin substrate to be mounted on the base, and a mounting hole formed in the thin member. And a tapping screw that is screwed into a pilot hole formed in the base, wherein the pilot hole formed in the base has at least one radially extending slit. This is achieved by a mounting structure for a thin member, characterized by the following.

In the mounting structure for a thin member according to the present invention, preferably, the tip of the slit is formed to be round.

In the thin member mounting structure according to the present invention, the tip of the slit preferably has a circular portion having a diameter larger than the slit width.

According to the above construction, a thin member such as a leaf spring or a circuit board is placed at a predetermined position on the base, and the mounting hole of the thin member is aligned with the lower hole of the base. And screwed into the pilot hole of the base. Thereby, the tapping screw is tightened while forming a thread on the inner wall of the pilot hole. Thus,
The thin member is fixedly held at a predetermined position on the base.

In this case, since the pilot hole is provided with at least one radially extending slit, when the pilot hole of the base is expanded and deformed by screwing in the tapping screw,
The base is slightly elastically deformed in the area of the slit, thereby suppressing the expanded deformation of the pilot hole. Accordingly, cracks are not generated around the pilot hole by dispersing the stress applied around the pilot hole by the slit when the tapping screw is tightened. Therefore,
For example, when attaching a thin member to a base made of a highly rigid and brittle resin material with a tapping screw,
The tapping screw can be securely tightened and the occurrence of cracks can be prevented without strictly controlling the diameter of the pilot hole and using a nut as in the related art.

When the tip of the slit is round, the stress applied around the pilot hole when the tapping screw is tightened does not concentrate on the tip of the slit. Cracks can be effectively prevented from being generated from the tip of the wire.

In the case where the tip of the slit has a circular portion having a diameter larger than the slit width, the stress applied around the pilot hole when the tapping screw is tightened is applied to the circular portion at the tip of the slit. The cracks can be more effectively prevented from being generated from the tip of the slit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows a first embodiment of a thin member mounting structure to which the present invention is applied. In FIG. 1, a thin member mounting structure 10 includes a base 11, a thin member 12 to be mounted on the base 11, and a tapping screw 13 for fastening the thin member 12 to the base 11.

Here, the base 11 is made of a resin material such as PPS or LCP mixed with a glass filler or the like in order to increase rigidity, and has a prepared hole 11a into which a tapping screw 13 is screwed. ing. The thin member 12 is, for example, a leaf spring or a thin circuit board, and has a mounting hole 1 through which the tapping screw 13 is inserted.
2a.

The above structure is substantially the same as the conventional thin member mounting structure shown in FIG. 4, but in the thin member mounting structure 10 according to the embodiment of the present invention, the base 11 is connected to the thin member mounting structure 10 shown in FIG. As shown in (B), it has at least one, and in the case shown, two slits 11b and 11c extending radially from the pilot hole 11a. This slit 1
1b and 11c, in the case of the drawing, extend in opposite directions to each other and have rounded tips. In the case of three or more slits, the slits are preferably arranged at equal angular intervals.

The thin member mounting structure 10 according to the embodiment of the present invention is configured as described above. When the thin member 12 is mounted on the base 11, the mounting operation is performed as follows. First, the thin member 12 is placed at a predetermined position on the base 11, and the mounting hole 12a of the thin member 12 is provided.
And the base 11a of the base 11 are aligned. Thereafter, the tapping screw 13 is inserted into the mounting hole 12a of the thin member 12, is inserted into the lower hole 11a of the base 11, and is screwed into the lower hole 11a. Thereby, the tapping screw 13 forms a screw thread on the inner wall of the pilot hole 11a,
Be tightened. Thus, the thin member 12 is
At a predetermined position.

In this case, since the prepared hole 11a of the base 11 has two slits 11b and 11c, the prepared hole 11
When a is expanded and deformed, the base 11 is slightly elastically deformed in the areas of the slits 11b and 11c as shown by an arrow A in FIG. Thereby, the expansion deformation of the pilot hole 11a is suppressed, and the stress applied around the pilot hole 11a when the tapping screw 13 is tightened is dispersed by the slits 11b and 11c. Accordingly, cracks do not occur around the pilot hole 11a, and a decrease in the tightening force of the tapping screw 13 and breakage of the base 11 such as cracks can be prevented. Since the tips of the slits 11b and 11c are rounded, the stress does not concentrate on the tips of the slits 11b and 11c, and therefore, cracks do not occur from the tips. In this way, when attaching the thin member 12 to the base 11 with the tapping screw 13, the tapping screw 13 can be used without strictly controlling the prepared hole diameter and using a nut as in the related art.
Can be securely tightened, and generation of cracks around the pilot hole can be prevented.

FIG. 2 shows a base of a thin member mounting structure according to a second embodiment of the present invention. In FIG. 2, a base 20 has four slits 22, 23, 23, extending radially from a pilot hole 21 and at equal angular intervals from each other.
24 and 25, and the other configuration is the same as the thin member mounting structure 10 shown in FIG.

According to the thin member mounting structure having such a configuration, when the tapping screw 13 is tightened, the slit 2
In the regions 2, 23, 24 and 25, the base 20 is slightly elastically deformed as shown by the arrow B in FIG. Thereby, the expansion deformation of the pilot hole 21 is suppressed, and the stress applied to the periphery of the pilot hole 21 when the tapping screw 13 is tightened is dispersed by these slits 22, 23, 24, 25. . Accordingly, cracks do not occur around the pilot hole 21, and a reduction in the tightening force of the tapping screw 13 and a breakage of the base 20 such as a crack can be more effectively prevented.

FIG. 3 shows a base in a third embodiment of the thin member mounting structure according to the present invention. In FIG. 3, a base 30 has two slits 32, 33 extending radially in opposite directions from a pilot hole 31 thereof.
Circular portions 34 and 35 having a diameter larger than the widths 2 and 33 are provided. Other configurations are the same as those of the thin member mounting structure 10 shown in FIG.

According to the thin member mounting structure having such a configuration, when the tapping screw 13 is tightened, the slit 3
In the regions 2 and 33, the base 20 is slightly elastically deformed as shown by an arrow C in FIG. Thereby, the pilot hole 31
Of the tapping screw 13
The stress applied to the periphery of the pilot hole 31 at the time of the tightening of
5 distributed. Therefore, no crack is generated around the pilot hole 31 and the tapping screw 13
, And destruction such as cracking of the base 20 can be more effectively prevented.

In the above embodiment, the case where the number of slits is two or four has been described.
Obviously, only one slit may be provided, or three or more slits may be provided.

In the above embodiment, the tapping screw 13 has been described. However, the present invention is not limited to this, and it is apparent that the present invention can be applied to a case where a screw made of a screw or the like is used.

[0026]

As described above, according to the present invention, a thin member such as a leaf spring or a circuit board is placed at a predetermined position on the base, and the mounting hole of the thin member is aligned with the base hole of the base. After that, a tapping screw is inserted into the mounting hole of the thin member and screwed into the prepared hole of the base. Thereby, the tapping screw is tightened while forming a thread on the inner wall of the pilot hole. Thus, the thin member is fixedly held at a predetermined position on the base.

In this case, since the pilot hole is provided with at least one radially extending slit, when the pilot hole of the base is expanded and deformed by screwing in the tapping screw,
The base is slightly elastically deformed in the area of the slit, thereby suppressing the expanded deformation of the pilot hole. Accordingly, cracks are not generated around the pilot hole by dispersing the stress applied around the pilot hole by the slit when the tapping screw is tightened. Therefore,
For example, when attaching a thin member to a base made of a highly rigid and brittle resin material with a tapping screw,
The tapping screw can be securely tightened and the occurrence of cracks can be prevented without strictly controlling the diameter of the pilot hole and using a nut as in the related art.

Thus, according to the present invention, an extremely excellent mounting structure for a thin member, in which a thin member can be easily fastened with a simple structure without generating a crack around a base hole of the base. Can be provided.

[Brief description of the drawings]

1A and 1B show a first embodiment of a thin member mounting structure according to the present invention, wherein FIG. 1A is a sectional view of a main part, and FIG.

FIG. 2 is a plan view of a base in a second embodiment of the thin member mounting structure according to the present invention.

FIG. 3 is a plan view of a base in a third embodiment of the thin member mounting structure according to the present invention.

FIG. 4 shows an example of a conventional thin member mounting structure;
(A) is a sectional view of a main part, and (B) is a diagram showing a crack in a pilot hole generated by tightening of a tapping screw.

FIG. 5 is a cross-sectional view of a main part showing another example of a conventional thin member mounting structure.

[Explanation of symbols]

Reference Signs List 10 Mounting structure of thin member 11, 20, 30 Base 11a, 21, 31 Prepared hole 11b, 11c, 22, 23, 24, 25, 32, 33
Slit 12 Thin member 12a Mounting hole 13 Tapping screw 34, 35 Circular part

Claims (3)

[Claims] 1. A base, a thin member such as a leaf spring or a thin substrate to be attached to the base, and tapping inserted into a mounting hole formed in the thin member and screwed into a pilot hole formed in the base. A mounting structure for a thin member, comprising a screw and a screw, wherein the pilot hole formed in the base has at least one radially extending slit. 2. The thin member mounting structure according to claim 1, wherein the slit has a rounded tip. 3. The slit according to claim 1, wherein the tip of the slit has a circular portion having a diameter larger than the slit width.
3. The mounting structure for a thin member according to claim 1.