JP4742389B2 - Fasteners and molded parts - Google Patents

Description

  The present invention relates to a fixing tool and a molded product member suitable for use by being fixed to a molded product member such as a mobile phone.

Conventionally, when a screw hole is formed in a member made of a synthetic resin molded product and a bolt is screwed in and fixed, it receives a tensile, torsional, vibration or other external force, or when it is attached or detached while reversing the bolt etc. Will be deformed or destroyed and become unusable.
Therefore, there is a nut-like metal fixing tool that can be securely fixed by inserting and fixing into a hole provided in a molded product member such as a synthetic resin, and can withstand repetitive attachment and detachment. It has been put into practical use. Furthermore, there has been proposed a method of providing a knurled or other irregularity on the outer peripheral surface of the fixing tool so that such a fixing tool bites into the hole of the molded product member and is fixed with sufficient strength (for example, Patent Documents). 1, 2).
For example, such stickers are often used in mobile phones.
However, in recent years, for example, the thickness of a casing of a mobile phone has been reduced, and the strength of the casing, which is a molded product member such as a synthetic resin, cannot be ensured. There was a problem that the required dimensions could not be secured.
Japanese Patent Laid-Open No. 50-85756 JP 58-124809 A

As described above, the thickness of a casing of a mobile phone or the like has been reduced, and the strength of the casing, which is a molded product member such as a synthetic resin, cannot be secured. There was a problem that the required dimensions of the tool could not be secured.
An object of the present invention is to provide a fixing tool and a molded product member that can secure the strength of the molded product member corresponding to the reduction in thickness and can further secure the necessary dimensions of the fixing tool.

According to the present invention, there are a fixing tool and a molded product member that are used in a casing such as a mobile phone and are fixed to a molded product member that is molded from a synthetic resin with a sheet metal as a core . A first curved surface portion and a second curved surface portion which are provided on both end surface sides of the cylindrical main body and are formed in an arc shape that protrudes obliquely outward from the end surface side with respect to the cylindrical axis; the first and the second large diameter part having a large number of irregularities Article on the outer peripheral surface of the second curved portion up to outside of the body smaller outer diameter than the diameter of the first large-diameter portion and the second A small-diameter portion provided between the large-diameter portion, and the sheet metal has an inner diameter smaller than the maximum outer diameter of the first and second curved surface portions and larger than the first and second large-diameter portions. Are provided with a plurality of holes,
When the fixing tool is fitted into a plurality of holes provided in the sheet metal, the fixing tool moves up and down in the column direction between the first curved surface portion and the second curved surface portion with respect to the sheet metal. enabling state, when the respective fastener set the position of the column direction vertical with respect to the sheet metal surface, each of fastener said by both sides synthetic resin of said sheet metal is shaped are set respectively pillar A fixing tool and a molded product member are provided which are fixed at positions in the upper and lower directions .
Further, according to the present invention, there is provided a fixing tool and a molding product member which are used in a casing such as a mobile phone and are fixed to a molding product member formed of a synthetic resin with a sheet metal as a core. The first and second maximum outer diameter portions, which are provided on both end surface sides of the cylindrical main body and increase the outer diameter from the end surface side to have a maximum outer diameter, and the first and second maximum outer diameters. A first and second large-diameter portion having a large number of irregularities on the outer peripheral surface of the main body, and the first large-diameter portion and the second large-diameter portion. A small-diameter portion provided between the first and second large-diameter portions, which is smaller than the maximum outer diameter of the first and second largest outer-diameter portions and larger than the outer diameter of the first and second large-diameter portions. a plurality of holes are provided in the inner diameter, when the fastener is fitted to the plurality of holes provided in the sheet metal, the fastener is first with respect to the sheet metal It becomes movable in the pillar direction vertically between the large outer diameter portion and the second maximum outer diameter, when the respective fastener set the position of the column direction vertical with respect to the sheet metal surface, of the sheet metal moldings member and fastener, characterized in that the respective fastener is secured to the set column direction vertical position, respectively is provided by double-sided synthetic resin is molded.

  The fixing tool and the molded product member according to the present invention can provide the fixing tool and the molded product member that can ensure the strength of the molded product member corresponding to the reduction in thickness and can further secure the necessary dimensions of the fixing tool. Become.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a half sectional view showing a fixing tool 1 called an insert according to the present invention. In other words, the fixing tool 1 is provided with projections 3 and 9 on a short cylindrical main body 2. Further, curved surface portions 4 and 8 cut into curved lines are provided. Furthermore, large-diameter portions 5 and 7 having knurls (uneven grooves) are provided on the outer peripheral surface of the main body 2. The knurls (concave and convex direction and flow direction) and shape (width and diameter) of the large diameter portions 5 and 7 and the shape (width and diameter) of the small diameter portion 6 can be changed according to the material of the molded product member to be fitted. . In this embodiment, there are two large-diameter portions. However, the present application only needs to be plural, and the outer diameters of the large-diameter portion and the small-diameter portion can also be changed depending on the material of the molded product member.

The outer diameter of the fastener 1 has the following relationship.
Maximum outer diameter of curved surface portions 4 and 8> large diameter portions 5 and 7> projection portions 3 and 9> small diameter portion 6
Further, the main body 2 is provided with a female screw 10 penetrating from the end surface a of the protruding portion 3 to the end surface b of the protruding portion 9. In addition, although the fixing tool 1 uses brass in the present embodiment, a relatively hard metal such as carbon steel, stainless steel, aluminum, or zinc may be used.

  FIG. 2 shows a panel (sheet metal) 11 used to reinforce the strength of a molded product member (details will be described later) formed of synthetic resin. Although the panel 11 is stainless steel having a thickness of 0.3 mm, a relatively hard metal such as carbon steel, brass, aluminum, or zinc that is strengthened may be used. The panel 11 is provided with a hole 12 into which the fixing tool 1 is fitted.

FIG. 3 is a cross-sectional view of the hole 12 provided in the panel 11. The inner diameter of the hole 12 is smaller than the maximum outer diameter of the curved surface portions 4 and 8 of the fixing tool 1 and larger than the large diameter portions 5 and 7.
With this configuration, the fixing tool 1 is fitted into the hole 12 of the panel 11 in this embodiment.

  FIG. 4 shows a cross section in a state where the fixing tool 1 is fitted in the hole 12 of the panel 11. That is, when the fixing tool 1 is fitted into the hole 12 of the panel 11, the maximum outer diameter of the curved surface portion 4 or the curved surface portion 8 of the fixing tool 1 is larger than the hole diameter of the hole 12, so that there is a fitting resistance but as shown in FIG. Further, since the curved surface portion 4 or the curved surface portion 8 is cut out into a curved line (on the drawing), it can be easily fitted. Then, the fixing tool fitted in the hole 12 of the panel 11 is in a state in which it can move up and down (in the drawing) between the curved surface portions 4 and 8.

Next, this embodiment will be described in detail from the state in which the fastener 1 is fitted in each of the six locations of the holes 12 of the panel 11.
FIG. 5 shows a cross section in a state where a synthetic resin is molded on the panel 11 to form a molded product member 13. That is, the synthetic resin 14 is molded on both surfaces of the panel 11, and the fixing tool 1 is fixed by molding the synthetic resin. As a result, knurls are formed on the large diameter portions 5 and 7 of the fixing tool 1 and the small diameter portion 6 is further provided, so that the fixing tool 1 is firmly fixed to the molded product member 13. Moreover, since the molded product member 13 is closely fixed to the panel 11, the strength is ensured.
In FIG. 5, the fixing tool 1 is fixed upward in the drawing, but the position where the fixing tool 1 is fixed between the curved surface portions 4 and 8 can be changed as necessary.
FIG. 6 is an example in which the fixing tool 1 is fixed downward in the drawing.

  As described above, according to the embodiment of the invention, the strength of the molded product member is secured by molding a synthetic resin by adding a panel (sheet metal) in fixing the molded product member and the fixing tool, Since the position of the fixing tool is fixed at the time of molding the synthetic resin, it becomes possible to secure the necessary dimensions.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. In addition, the embodiments may be combined as appropriate as possible, and in that case, the combined effect can be obtained. Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be obtained as an invention.

1 is a half sectional view showing an example of a fixing tool to which an embodiment of the present invention can be applied. The figure which shows the example of a shape of a panel. Sectional drawing for demonstrating the hole of a panel. The half sectional view which shows the state which inserted the fixing tool in the panel. The half sectional view which shows the shape of the molded article member to which the fixing tool was fixed. The half sectional view which shows the shape of the molded article member to which the fixing tool was fixed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fastening tool, 2 ... Main body, 3, 9 ... Projection part, 4, 8 ... Curved surface part, 5, 7 ... Large diameter part, 6 ... Small diameter part, 10 ... Female screw, 11 ... Panel, 12 ... Hole, 13 ... Molded product member, 14 ... synthetic resin.

Claims (2)

A fixing tool and a molded product member that are used in a casing such as a mobile phone, and are fixed to a molded product member that is molded from a synthetic resin with a sheet metal as a core ,
The fixing tool includes first and second curved surface portions which are provided on both end surfaces of the cylindrical main body and are formed in an arcuate shape that protrudes obliquely outward from the end surface to the cylindrical axis. a first having a plurality of irregularities Article on the outer peripheral surface of the first and second curved portions maximum outer diameter the body outer diameter is smaller than the second large diameter portion, the first large-diameter A small-diameter portion provided between the portion and the second large-diameter portion,
The sheet metal is provided with a plurality of holes having an inner diameter smaller than the maximum outer diameter of the first and second curved surface portions and larger than the first and second large diameter portions,
When the fixing tool is fitted into a plurality of holes provided in the sheet metal, the fixing tool moves up and down in the column direction between the first curved surface portion and the second curved surface portion with respect to the sheet metal. Ready to go
When the respective fasteners are set in the vertical direction in the column direction with respect to the sheet metal surface , synthetic resin is molded on both surfaces of the sheet metal, so that the respective fasteners are respectively set in the vertical direction in the column direction. A fixing tool and a molded product member characterized by being fixed. A fixing tool and a molded product member that are used in a casing such as a mobile phone, and are fixed to a molded product member that is molded from a synthetic resin with a sheet metal as a core ,
The fixing tool is provided on both end surfaces of the cylindrical main body, and the first and second maximum outer diameter portions having the maximum outer diameter by increasing the outer diameter from the end surface side, and the first and second First and second large diameter portions having a large number of irregularities on the outer peripheral surface of the main body, the outer diameter being smaller than the maximum outer diameter of the maximum outer diameter portion, the first large diameter portion and the second large diameter A small diameter portion provided between the diameter portion and
The sheet metal is provided with a plurality of holes having an inner diameter smaller than the maximum outer diameter of the first and second maximum outer diameter portions and larger than the outer diameter of the first and second large diameter portions,
When the fixing tool is fitted into a plurality of holes provided in the sheet metal, the fixing tool is a column between the first maximum outer diameter portion and the second maximum outer diameter portion with respect to the sheet metal. It can move up and down the direction,
When the respective fasteners are set in the vertical direction in the column direction with respect to the sheet metal surface , synthetic resin is molded on both surfaces of the sheet metal, so that the respective fasteners are respectively set in the vertical direction in the column direction. A fixing tool and a molded product member characterized by being fixed.

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