JPH067283U - Metal case device - Google Patents

Abstract

(57) [Abstract] [Purpose] Even in a metal case with a non-conductive coating formed on its surface, the component mounting brackets fixed to it can be electrically connected well to the metal case, but scratches appear on the metal case. There is no fear. [Structure] _On the back surface of a panel 13 made of, for example, anodized aluminum material, which is a part of a metal case,
When the chassis 4 having a protrusion 5 at the edge fixed with screws 3, the chassis 4 is pushed towards the panel 1 _3, since the projections 5 break the non-conductive coating surface bite into the panel 1 _3,
Chassis 4 is good electrical contact with the panel 1 _3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal case device used for electronic devices and the like.

[0002]

[Prior art]

 As shown in FIG. 5, a lower case a having no side wall is fitted with an upper case b having no side wall in the same direction, and is fastened with a screw d via a toothed washer c to be joined together. The panel e is fitted into the openings of the lower case a and the upper case b, and is fastened with the screw d via the toothed washer c, and at the same time, the chassis f is fixed to the panel e with the screw d. The fixing hardware h of the jack g is fixed with the screw d through the toothed washer c, and the toothed washer c provides good electrical continuity between the upper case b, the panel e or the mounting hardware h and the lower case a. There is known a metal case device.

When the lower case a and the upper case b are made of anodized aluminum, after the back side of the lower case a that comes into contact with the mounting hardware h of the jack g is ground with a grinder or the like. It is fixed with a screw d.

In FIG. 5, i is a wiring board on which an electrical component j is mounted, which is attached to the chassis f 1.

[0005]

[Problems to be solved by the device]

 Since the above-mentioned conventional metal case device uses the toothed washer c, the lower case a, the upper case b, the panel e, etc. and the chassis f, the jack mounting bracket h, etc., or the lower case a, the upper case b are screwed. There is a disadvantage in that the scratches caused by the toothed washer c may come out from the head of the screw d or the like when it is fixed by the d or the like, and the appearance may be unsightly. Further, when the lower case a, the upper case b and the panel e are made of alumite-treated aluminum material, there is an inconvenience that the number of processing steps is increased because they are polished.

An object of the present invention is to provide a conventional metal case device that does not have such inconvenience.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the invention according to claim 1 is a metal case device in which a component mounting bracket is fixed to a metal case with a screw or the like to electrically connect the component mounting bracket to the metal case. The invention as set forth in claim 2, wherein the component mounting bracket is provided with a protrusion that bites into the metal case when the component mounting bracket is secured to the metal case. In a metal case device in which the component mounting bracket is electrically connected to a metal case, the metal case is composed of a plurality of members, and when one member of the metal case is fixed to another member, It is characterized by the provision of protrusions that bite into the member.

[0008]

[Action]

 When the protrusions provided on the one member of the component mounting bracket and the metal case are fixed to the metal case of the component mounting bracket and one member of the metal case to another member by screws, respectively, the metal case and the metal case By biting into the other members respectively, good electrical continuity can be obtained between the component mounting bracket and the metal case, and between one member of the metal case and the other member. When a metal material having a non-conductive film such as alumite-treated aluminum on the surface is used for the metal case, the non-conductive film is broken due to the protrusions penetrating into the metal case, and good electrical conduction is obtained.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

1 to 4, 1₁1₂Is a lower case and an upper case made of metal such as a vinyl chloride coated steel plate, 1₃Is a panel made of metal such as aluminum plate which has been anodized.₁, Upper case 1₂And panel 1₃The metal case 1 is composed of. Lower case 1₁Upper case 1₂The protrusion 2 is formed in the fitting part of the lower case 1₁And upper case 1₂When fixing with a screw 3, the protrusion 2 is the upper case 1 ₂ The bottom surface of the lower case 1₁Is the top case 1₂On the other hand, electrical continuity is improved. Panel 1₃Is the fixed bottom case 1₁And upper case 1₂Lower case 1 with screws 3 so as to close the opening formed by₁The metal chassis 4 is attached to the panel 1 at the same time with these screws 3.₃Attached to. A plurality of protrusions 5 are formed on the opening edge of the chassis 4 as shown in FIG. 2, and four protrusions 5 are formed on both sides in the illustrated example (one side is omitted in the drawing). Panel 1₃When attached to the panel 1, as shown in FIG.₃Since the through holes 6 of the chassis 4 are formed so as to be biased with respect to the screw holes 7 of the chassis 4, the chassis 4 is mounted on the panel 1₃Is pressed toward and the protrusion 5 is attached to the panel 1.₃Bite into the back of the chassis, chassis 4 and panel 1₃It has good electrical continuity with. Also, lower case 1₁For example, a jack mounting member 8 is attached with a screw 3. As shown in FIG. 4, the jack mounting bracket 8 has a lower case 1₁A protrusion 10 is formed around a through hole 9 into which a screw 3 on a mounting surface of the jack 3 is screwed. ₁ When attached to the bottom with screws 3, lower case 1₁Bite into the case, the galvanized coating is broken, for example, and the jack mounting metal 8 comes to the lower case 1.₁And electrically connected well. The jack 11 and the wiring board 12 are mounted on the jack mounting bracket 8.

[0011] Incidentally, the chassis 4, the wiring board 1 4 electrical components 13 are mounted is fitted in the illustrated example, a portion of the electrical component 13 that protrude from the through hole 15 of the panel 1 _3.

[0012]

[Effect of device]

 According to a first aspect of the present invention, a protrusion is provided on the component mounting bracket, and when the component mounting bracket is fixed to the metal case, the protrusion is allowed to bite into the metal case. Since a protrusion is provided on one member of the metal case consisting of, the non-conductive coating is formed on the surface of the metal case because when one member is fixed to another member, the protrusion bites into the other member. However, good electrical continuity can be obtained, and there is an effect that the surface of the metal case is not likely to be scratched unlike the conventional case.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partial perspective view of the chassis of the above embodiment.

FIG. 3 is a sectional view of a panel fixing portion of the chassis in the above embodiment.

4A and 4B are a partial side view and a partial plan view of the jack mounting bracket in the above embodiment.

FIG. 5 is a sectional view of a conventional metal case device.

[Explanation of symbols]

1 Metal case 1 ₁ Lower case 1 ₁ 1 ₂
Upper case 1 ₃ Panel 2 Protrusion
3 Screw 4 Chassis 5 Protrusion 8 Jack mounting bracket 10
Protrusion

Claims (2)

[Scope of utility model registration request] 1. A metal case device, comprising: a component mounting bracket fixed to a metal case with screws or the like to electrically connect the component mounting bracket to the metal case.
A metal case device characterized in that a projection is provided to allow the metal case to bite when it is fixed to the metal case. 2. A metal case device comprising a metal case, to which a component mounting bracket is fixed by screws or the like so that the component mounting bracket is electrically connected to the metal case, wherein the metal case is composed of a plurality of members. A metal case device, wherein one member of the case is provided with a protrusion that allows the member to bite into another member when the member is fixed to the other member.