JPH05259654A - Electrical apparatus housing - Google Patents

Abstract

PURPOSE:To form a plating layer for preventing heat-radiation and noise only in a required part of the inner surface. CONSTITUTION:An outer layer 11 and an inner layer 12, namely two colors, are formed of different materials. A part of the outer layer 11 mode of a material adaptive for plating is exposed to the inner plate through an opening part formed in the inner layer 12 made of a material resistant to plating to perform plating. At this time, not only the outer surface but also the inner surface of the outer layer 11 exposed to the inner surface through the opening part formed in the inner layer 12 are plated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for a small electric device such as an electric razor.

[0002]

2. Description of the Related Art In a small electric device such as an electric razor, a housing is made of synthetic resin.
In order to prevent problems such as temperature rise and noise caused by the electronic components housed inside, an aluminum plate was attached to the inner surface of the housing to obtain heat dissipation and noise prevention effects.

[0003]

However, when an aluminum plate is used, the number of parts is increased and a step of attaching is required, which inevitably increases the cost. For this reason, it is conceivable that the inner surface of the housing is plated to prevent heat dissipation and noise with a plating layer made of a metal material. However, applying plating means that the plating layer is formed on the entire outer surface and inner surface of the housing. This will cause a short circuit of the internal circuit, and it is not preferable that the outer surface and the inner surface of the housing are electrically connected by the plating layer.

The present invention has been made in view of the above points, and an object thereof is to provide a housing of an electric device in which a plating layer for heat dissipation and noise prevention can be applied only to a required portion of the inner surface. There is

[0005]

SUMMARY OF THE INVENTION The present invention, however, comprises two-color molding in which an outer layer and an inner layer are formed of different materials, and a part of the outer layer made of a parent plating material is made of a non-parent plating material. It is characterized in that it is exposed to the inner surface through an opening formed in the inner layer.

[0006]

According to the present invention, when plating is performed, at this time, not only the outer surface but also the inner surface of the outer layer exposed to the inner surface through the opening formed in the inner layer is plated. The plating layer can be formed only on a part of the inner surface.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. The illustrated embodiment is an electric shaver having two blade heads 2 and 2 at its upper end as shown in FIG. A switch handle 15 which is vertically slidable is disposed on the rear side, and a trimmer block 5 which is also slidable vertically is disposed on the back side.
In the housing 1, as shown in FIG. 3, a motor 31 and a pair of secondary batteries 3 located on both sides of the motor 31.
2, 32, a driver element 6 which is located above the motor 31 and which converts the movement of an eccentric shaft 35 attached to the output shaft of the motor 31 into a reciprocating motion is arranged. The charging circuit module 33 is arranged on the lower side, and charging terminal pins 34 connected to the charging circuit module 33 are provided in the recesses on the lower surface.

Outer blade blocks 20, 20 of each blade head 2 are attached to the upper end of the housing 1 via an outer blade frame 40 and a mounting frame 41. on the other hand,
From the upper end surface of the housing 1, a pair of cylindrical connecting bushes 60, 60 protruding from the upper surface of the driver 6 project, and the inner blade blocks 21, 21 are respectively provided on the upper ends of the connecting bushes 60. It is installed. The blade head 2 is formed by the inner blade block 21 and the outer blade block 20. Reference numeral 16 in FIG. 3 denotes an engaging protrusion that detachably attaches the outer cutter frame 40 to the housing 1, and 42 denotes a hook for attaching the outer cutter frame 40 to the outer cutter frame 40. A reference numeral 18 denotes a dustproof rubber which is formed on the upper surface of the housing 1 and closes an opening through which the connecting bush 60 is projected upward.

The housing 1 here is formed by combining the front and rear halves of the housings 1a and 1b.
Each of a and 1b is composed of an outer layer 11 and an inner layer 12
Color molding, that is, the inner layer 12 is first molded and then the inner layer 1
2 is formed by molding the outer layer 11 as a base, and the outer layer 11 is a parent-plating material (plating grade) having excellent adhesion of plating to the surface thereof, such as ABS.
The inner layer is formed of a resin, whereas the inner layer is formed of a non-philic plating material (non-plating grade), such as PC (polycarbonate), on which plating does not adhere. Further, the inner layer 12 on the housing 1b side has an opening at the position where the charging circuit module 33 is located, and by allowing the outer layer 11 to enter this opening, the outer layer is formed on a part of the inner surface of the housing 1. 11 is exposed.

The housing 1 formed in this way
Is subjected to plating for its surface finish. This is done by immersing it in a plating bath and then forming two outer runners (not shown) integrally with the outer layer 11 when molding the outer layer 11. ) By applying voltage. The runner part is finally removed. Here, as described above, since the outer layer 11 is made of a parent-plating material and the inner layer 12 is made of a non-plating material, the plating adheres only to the surface of the outer layer 11 and does not adhere to the surface of the inner layer 12. Also, this plating is applied not only on the outer surface side of the housing 1 covered with the outer layer 11,
It also adheres to a part of the inner surface side of the housing 1, that is, a part where the outer layer 11 is exposed through the opening in the inner layer 12. The shaded portions in FIGS. 4 and 5 indicate the portions to which the plating is attached. Since the plating layer attached to the inner surface of the housing 11 is made of a metal material such as Cu, Ni, Cr, the heat dissipation from the charging circuit module 33 arranged in the housing 1 and the leakage of noise to the outside are prevented. Will be prevented.

Reference numeral 19 in FIG. 6 denotes a screw receiving portion which is integrally projected from the inner surface of the housing 1. When the screw receiving portion is brought into contact with the printed circuit board in the charging circuit module 33, the printed circuit board is lifted and the thickness direction of the housing 1 varies. Prevents lagging. Also, the outer blade frame 40 in FIG.
Step 1 formed on the outer wall of the upper end of the housing 1 covered with
4 is for reducing the spillage of the beard scraps when the outer blade frame 40 is removed from the housing 1. That is, if there is no step portion 14, as shown in FIG. 8, whiskers accumulate at the step of fitting the outer cutter frame 40 in the housing 1, and the whiskers immediately spill when the outer cutter frame 40 is removed. However, if the step portion 14 is provided, as shown in FIG. 7, whiskers accumulate on the step portion 14, and even if the outer blade frame 40 is removed, the whiskers on the step portion 14 are at the fitting step. Although it spills, the amount of further spillage from the mating stage is small.

[0012]

As described above, according to the present invention, since a part of the outer layer made of the electrophilic plating material is exposed to the inner surface through the opening formed in the inner layer made of the non-electrophilic plating material, the plating is performed. If this is done, not only the outer surface of the outer layer but also the inner surface of the outer layer exposed to the inner surface through the opening formed in the inner layer is plated at this time. This plating layer can prevent heat dissipation and noise without requiring other parts such as an aluminum plate, and the plating layer on the inner surface is formed only on a part of the inner surface. Therefore, it is possible to prevent the possibility of a short circuit of the internal circuit and the electrical connection between the outer surface and the inner surface of the housing by the plating layer.

[Brief description of drawings]

1 is a horizontal sectional view taken along the line AA in FIG. 2, showing an embodiment.

FIG. 2 is a vertical sectional view of the above.

FIG. 3 is a transverse sectional view of the above.

FIG. 4 is a front view of the above housing.

FIG. 5 is a rear view of the above housing.

FIG. 6 is a horizontal sectional view taken along the line BB in FIG.

7 (a) and (b) are partial cross-sectional views showing the operation of the step portion.

8A and 8B are partial cross-sectional views showing the operation when there is no step.

[Explanation of symbols]

 1 Housing 11 Outer layer 12 Inner layer

Claims (1)

[Claims] 1. An outer layer and an inner layer formed of different materials 2
An electric equipment housing, which is formed by color molding and in which a part of an outer layer made of a parent-plating material is exposed to an inner surface through an opening formed in an inner layer made of a non-plating material.