JP2002158454A - Electric apparatus case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric apparatus case which has a high shield effect and a front panel which can be easily and surely mounted. SOLUTION: An electric apparatus case is equipped with a front board 10 which is bent upwards from the leading edge of a base board 1a of a bottom chassis 1, a part around the leading edge of the top board 3a of a top cover 3 is bent downwards into the shape of an arc for the formation of a protuberant stripe 11 that extends up to all the width of the part, and a pair of bent plates 12 which are bent backwards from the upper end of the front board 10 extending nearly up to all the width of the front board 10 is made to bear elastically against the undersurface of the protuberant stripe 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for an electric device for housing a main body of a device such as a tuner for a digital television.

[0002]

2. Description of the Related Art Conventionally, as a technique of a housing for electric equipment, there is a technique described in Japanese Patent Application Laid-Open No. 3-95993.
An example thereof will be described with reference to FIGS. 8 and 9. This is combined with the front surface of a bottom chassis 1 made of a steel plate having a bottom plate 1 a and a pair of left and right side plates 1 b bent upward from both side edges of the bottom plate 1 a. A resin front panel 2 is fitted, and a steel plate top cover 3 having a top plate portion 3a and a pair of left and right side plate portions 3b bent downward from both side edges of the top plate portion 3a is fitted to the upper surface of the bottom cover 1. Have been combined.
Reference numeral 4 denotes a screw that passes through the side plate 3b of the top cover 3 and is screwed into a screw hole of the side plate 1b of the bottom chassis 1.
Are a plurality of lower projections projecting from the lower edge of the front panel 2 and are engaged with the bottom plate 1a.

[0003]

In the above configuration, the bottom chassis 1 and the top cover 3 made of a steel plate surround the equipment body (not shown) housed therein, thereby shielding external radio waves and shielding. Although the effect is produced, since the front surface of the bottom chassis 1 is open, there is a possibility that an external radio wave enters from the front panel 2 side.

Since the front surface of the bottom chassis 1 is open as described above, the attachment of the front panel 2 to the bottom chassis 1 tends to be insufficient.
Therefore, as shown in the figure, a substantially U-shaped reinforcing frame 6 is fixed to the bottom plate portion 1a, and a plurality of upper projecting pieces 7 projecting from the back surface of the front panel 2 are fixed to the reinforcing frame 6 with screws 8. However, this increases the number of parts,
The installation of the front panel 2 takes time and is troublesome, leading to an increase in cost.

SUMMARY OF THE INVENTION [0005] In view of the above-mentioned conventional disadvantages, an object of the present invention is to provide a housing for electric equipment which has a high shielding effect and can easily and securely mount a front panel.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a steel sheet bottom chassis having a bottom plate and a pair of left and right side plates bent upward from both side edges of the bottom plate. A front panel made of a synthetic resin is fitted to the front surface, and a steel plate top cover having a top plate and a pair of left and right side plates bent downward from both side edges of the top plate is fitted to the upper surface of the bottom cover. In the electrical device casing, a front plate portion that is bent upward from the front edge of the bottom plate portion to close the front surface of the bottom chassis is provided, and by bending a portion near the front edge of the top plate portion downward, A ridge is formed over substantially the entire width of the vicinity of the front edge, and a bent plate that is bent rearward from the upper end of the front plate is integrally provided over substantially the entire width of the front plate, and the ridge is formed. Under A plurality of through-holes penetrating through the front plate portion, and a plurality of protrusions of a plurality of printed circuit board locking members protruding from the front surface of the front panel with respect to the respective through-holes. Is fitted into the front panel by an end plate portion bent downward from the front edge of the top plate portion and an inclined plate portion extending diagonally upward toward the front from the lower end of the end plate portion. An end plate portion having an upper locking piece having a substantially J-shaped cross section and bent inward from front edges of both side plate portions of the top cover, and a protruding plate portion extending forward from the end plate portion. And a lateral locking piece having a substantially L-shaped cross section to be fitted into the front panel.

According to the above configuration, the bottom chassis and the top cover can cut off external radio waves entering from the top, bottom, left and right, and the front surface of the bottom chassis is closed by the front plate. External radio waves entering from the front panel side can also be blocked, the shielding effect can be further enhanced, and the front plate is formed integrally with the bottom plate of the bottom chassis. Costs can be reduced to the same extent as before.

Further, since the lower surface of the ridge formed substantially over the entire width near the front edge of the top plate abuts against the front plate, it is likely to enter from between the top plate and the front plate. External radio waves can be reliably blocked, and the projections can be reinforced so that the top plate is not bent.

Further, since the upper surface of the bent plate integrally projecting over substantially the entire width of the front plate portion is elastically brought into contact with the ridge portion of the top plate portion, a gap between the front plate portion and the top plate portion is provided. Even if there is an error in the interval, the error can be absorbed and the shielding effect can be maintained more reliably.

In addition, the front panel can be easily positioned on the front surface of the bottom chassis simply by fitting the projections of the printed circuit board locking members projecting from the back surface of the front panel into the respective through holes of the front plate portion. It can be locked up and down and left and right so that it does not accidentally swing. Also, since the printed board locking member is also used for positioning and locking the front panel and locking the printed board, it is also used for that purpose. The structure is simpler and the production cost is lower.

[0011] Then, by simply inserting the upper locking piece and the horizontal locking piece into the front panel from diagonally rearward to make the front panel horizontal, the top plate portion and both side plate portions of the top cover are integrated with the front panel. Can be locked.

According to a second aspect of the present invention, in the first aspect of the invention, a plurality of bent pieces bent rearward from an upper end portion of the front plate portion have a predetermined interval along a width direction of the front plate portion. And a plurality of openings are opened at predetermined intervals along the width direction of the front plate portion at the lower end of the front plate portion. A plurality of upper protruding pieces facing the bent piece and a plurality of lower protruding pieces facing each opening are protruded, and the engaging portion provided on each of the upper protruding pieces is provided on each of the bent pieces. In addition to engaging with the engaged portion, each lower projection piece is inserted into each of the openings, and the engagement portion provided on each lower projection piece is engaged with the engaged portion provided on the bottom plate portion. It is characterized by doing.

According to the above construction, the engaging portions of the upper projecting pieces projecting from the rear surface of the front panel are engaged with the engaged portions of the bending pieces integrally projecting from the upper end of the front plate. At the same time, the front panel can be integrally connected to the front plate simply by engaging the engaging portions of the respective lower protrusions with the engaged portions of the bottom plate through the respective openings of the front plate. .

According to a third aspect of the present invention, in the first and second aspects of the present invention, a plurality of lower surface abutting pieces are provided which project rearward from a lower edge of the front panel and abut against a lower surface of the bottom plate. It is characterized by having.

According to the above construction, each lower surface contacting piece projecting rearward from the lower edge of the front panel is brought into contact with the lower surface of the bottom plate to prevent the front panel from floating and coming off the bottom plate. be able to.

According to a fourth aspect of the present invention, a synthetic resin front panel is fitted to a front surface of a steel plate bottom chassis having a bottom plate portion and a pair of left and right side plates bent upward from both side edges of the bottom plate portion. In a housing for an electric device, a steel plate top cover having a pair of left and right side plates bent downward from both side edges of the plate and the top plate is fitted to an upper surface of the bottom cover. A front plate portion is provided, which is bent upward from a front edge and closes a front surface of the bottom chassis.

According to the above configuration, the bottom chassis and the top cover can cut off external radio waves entering from the top, bottom, left and right, and the front surface of the bottom chassis is closed by the front plate. External radio waves entering from the front panel side can also be blocked, and the shielding effect can be further enhanced. Further, since the front plate portion is formed integrally with the bottom plate portion of the bottom chassis, the number of parts does not increase, and the manufacturing cost can be reduced to the same extent as the conventional case.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, a ridge portion is formed over substantially the entire width of the vicinity of the front edge by bending a portion near the front edge of the top plate downward. And the lower surface of the ridge portion is in contact with the front plate portion.

According to the above construction, the lower surface of the ridge formed substantially over the entire width near the front edge of the top plate is brought into contact with the front plate. Can reliably block external radio waves that try to invade from
The ridges can also reinforce the top plate so as not to bend.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a bent plate that bends rearward from an upper end of the front plate portion is integrally protruded over substantially the entire width of the front plate portion. The upper surface of the bent plate is elastically brought into contact with the lower surface of the ridge.

According to the above configuration, the upper surface of the bent plate integrally projecting over substantially the entire width of the front plate portion is elastically brought into contact with the ridge portion of the top plate portion. Even if there is an error in the interval between the parts, the error can be absorbed and the shielding effect can be maintained more reliably.

According to a seventh aspect of the present invention, in the invention according to any one of the fourth to sixth aspects, a plurality of through holes are provided in the front plate portion, and each of the through holes protrudes from the back surface of the front panel. It is characterized in that the plurality of provided projections are fitted respectively.

According to the above configuration, the front panel can be easily positioned on the front surface of the bottom chassis simply by fitting the plurality of projections projecting from the rear surface of the front panel into the respective through holes of the front plate portion. It can be locked up, down, left and right so that it does not move unexpectedly.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention, the plurality of projections are formed integrally with a printed board locking member projecting from the back surface of the front panel. I have.

According to the above construction, a plurality of projections for positioning and locking the front panel are formed integrally with the printed board locking member projecting from the back surface of the front panel. Is also used for positioning and locking of the front panel and locking of the printed circuit board, so that the structure is simplified and the manufacturing cost is reduced by the shared use.

According to a ninth aspect of the present invention, in the invention according to any one of the fourth to eighth aspects, an end plate portion bent downward from a front edge of the top plate portion and a lower end of the end plate portion are provided. An inclined plate portion extending obliquely upward toward the front is provided with an upper locking piece having a substantially J-shaped cross section and fitted into the front panel.

According to the above configuration, the upper locking piece having a substantially J-shaped cross section provided at the front edge of the top plate portion is inserted obliquely from the rear into the front panel to be in a horizontal state. The top plate can be integrally locked.

The invention according to claim 10 is the invention according to claims 4 to 9
In the invention according to any one of the above, an end plate portion bent inward from front edges of both side plate portions of the top cover, and a protruding plate portion extending forward from the end plate portion, and are provided in the front panel. It is characterized by having a lateral locking piece having a substantially L-shaped cross section to be fitted.

According to the above-described structure, the two lateral locking pieces having a substantially L-shaped cross section provided at the front edges of the both side plates of the top cover are simply inserted into the front panel, and the top cover of the top cover is attached to the front panel. Both side plate parts can be integrally locked.

[0030] The invention according to claim 11 is the invention according to claims 4 to 1.
In the invention according to any one of the first to third aspects, a plurality of bent pieces that bend rearward from an upper end of the front plate portion are integrally protruded at predetermined intervals along a width direction of the front plate portion. A plurality of upper projections are provided on the back surface of the front panel so as to face each bent piece, and an engagement portion provided on each of the upper projections is an engaged portion provided on each of the bent pieces. Is characterized in that it is adapted to be engaged.

According to the above configuration, the engaging portion of each upper protruding piece projecting from the back surface of the front panel is engaged with the engaged portion of each bent piece integrally protruding from the upper end of the front plate portion. By itself, the upper portion of the front panel can be integrally connected to the upper end portion of the front plate portion.

The twelfth aspect of the present invention relates to the fourth to the first aspects.
In the invention according to any one of the first to third aspects, a plurality of openings are formed at predetermined intervals along a width direction of the front plate portion at a lower end portion of the front plate portion, and the openings are opposed to the openings. A plurality of lower projections project from the back surface of the front panel, and each of the lower projections is fitted into each of the openings, and an engagement portion provided on each of the lower projections is provided on the bottom plate. It is characterized in that it is made to engage with the joint.

According to the above construction, the engaging portions of the lower projecting pieces projecting from the rear surface of the front panel are merely engaged with the engaged portions of the bottom plate through the respective openings of the front plate. The lower part of the front panel can be integrally connected to the bottom plate part.

[0034] The invention of claim 13 provides the invention according to claims 4 to 1
2. The invention according to any one of 2), wherein a plurality of lower surface contact pieces projecting rearward from a lower edge portion of the front panel and contacting a lower surface of the bottom plate portion are provided.

According to the above construction, each lower surface contacting piece projecting rearward from the lower edge of the front panel is brought into contact with the lower surface of the bottom plate to prevent the front panel from floating and coming off the bottom plate. be able to.

[0036]

1 to 4 show a housing for an electric device according to an embodiment of the present invention.
The main body (not shown) of the digital TV tuner is housed therein. The front body 10 has a front plate 10 bent upward from a front edge of a bottom plate 1 a of the bottom chassis 1. By bending a portion near the front edge of the portion 3a downward, a projecting portion 11 having a substantially arc-shaped cross section having a predetermined length h over substantially the entire width of the portion near the front edge is formed. A pair of left and right bent plates 12 of a predetermined length d covering substantially the entire width of the front plate portion 10 that bends rearward from the front side elastically abut on the lower surface of the ridge portion 11 (FIGS. 5 and 6). reference). Reference numeral 9 denotes a rear cover fixed to the rear surface of the bottom chassis 1 with screws 9a. The same components as those shown in FIGS. 8 and 9 are denoted by the same reference numerals except for those described above, and description thereof will be omitted.

According to the above configuration, the bottom chassis 1 and the top cover 3 can cut off external radio waves entering from above, below, left and right, and the front surface of the bottom chassis 1 is closed by the front plate 10. As a result, external radio waves entering from the front panel 2 side can also be blocked, and the shielding effect can be further enhanced.
Since 0 is formed integrally with the bottom plate 1a of the bottom chassis 1, the number of parts does not increase, and the manufacturing cost can be reduced to the same extent as the conventional case.

Further, the front plate portion 1a is positioned on the lower surface of the ridge portion 11 formed substantially over the entire width near the front edge of the top plate portion 3a.
0, the upper surface of the bent plate 12 integrally projecting over substantially the entire width of the front plate portion 10 and the top plate portion 3 are elastically brought into contact with each other.
If there is an error in the space between the front plate 10a and the top plate 3a, the error is absorbed, and external radio waves that are going to enter from between the front plate 10 and the top plate 3a are reliably blocked to enhance the shielding effect. The top plate 3a can be reinforced by the ridge 11 so as not to bend.

As shown in FIGS. 5 and 6, the front plate 1
A plurality of (two in this embodiment) through-holes 14 are provided at predetermined intervals in the central portion of the front panel 2, and a plurality of printed circuit board locking members The protrusion 15 a is integrally formed on the tip of each printed board locking member 15 and is fitted into each through hole 14.

According to the above configuration, the projection 15 a of the printed board locking member 15 protruding from the back surface of the front panel 2.
The front panel 2 can be easily positioned on the front surface of the bottom chassis 1 and locked so as not to be unexpectedly swung up and down, left and right, by merely fitting the front panel 2 into each through hole 14 of the front plate portion 10. , Printed board locking member 15
Are also used for positioning and locking of the front panel 2 and locking of the printed circuit board 16, so that the structure is simplified and the manufacturing cost is reduced by the shared use.

As shown in FIGS. 2, 4 and 6, an end plate portion 18a bent downward from the front edge of the top plate portion 3a and an obliquely upward direction from the lower end of the end plate portion 18a toward the front. An upper locking piece 18 having a substantially J-shaped cross-section is fitted into the front panel 2 and is formed by extending the inclined plate portion 18b, and is bent inward from the front edges of the both side plate portions 3b of the top cover 3. The end plate portion 19a and a protruding plate portion 19b extending forward from the end plate portion 19a have a lateral locking piece 19 having a substantially L-shaped cross section and fitted into the front panel 2. .

According to the above configuration, as shown by the phantom line in FIG. 6, the upper locking piece 18 and the horizontal locking piece 19 are simply inserted into the front panel 2 from diagonally rearward to be in a horizontal state. Top plate 3 of top cover 3 on front panel 2
a and both side plate parts 3b can be integrally locked.

As shown in FIG. 4 and FIG. 7, a plurality of bent pieces 21 bent rearward from the central portion of the upper end of the front plate portion 10 and both sides of the upper end thereof are integrally provided and provided. A plurality of openings 22 are opened at the lower center and at both lower ends of the lower end 10, and on the back surface of the front panel 2, a plurality of upper projections 23 facing the respective bent pieces 21 and opposing the respective openings 22. The lower projection piece 24 is provided in a protruding manner,
Engagement holes (engagement portions) 23a provided in the respective upper projecting pieces 23
Is engaged with an engaging claw (engaged portion) 21 a formed by cutting and raising each bent piece 21, and each lower projecting piece 24 is inserted into each opening 22, and The provided convex portion (engaging portion) 24a is engaged with an engaging hole (engaged portion) 25 provided in the bottom plate portion 1a.

According to the above configuration, the engaging hole 23a of each upper projecting piece 23 is engaged with the engaging claw 21a of each bent piece 21 and the convex portion 24a of each lower projecting piece 24 is Only by engaging with the engagement hole 25 through each opening 22 of
The front panel 2 can be integrally connected to the front plate 10. Reference numeral 26 denotes a connecting tool such as a screw for integrally connecting the bent piece 21 and the upper protruding piece 23.

As shown in FIGS. 3 and 6, a plurality of lower surface contact pieces 28 are provided which project rearward from the lower edge of the front panel 2 and abut against the lower surface of the bottom plate 1a.

According to the above configuration, the front panel 2 can be prevented from floating and coming off the bottom plate portion 1a by contacting each lower surface contact piece 28 with the lower surface of the bottom plate portion 1a. Reference numeral 29 denotes a fastener for fastening each lower surface contact piece 28 to the bottom plate 1a, and may be omitted.

In the above-described embodiment, the description has been given by taking as an example the case of the electric device housing the device main body of the digital TV tuner. However, the present invention is not limited to this. Can also be applied.

[0048]

According to the first aspect of the present invention, the bottom chassis and the top cover can block external radio waves invading from above, below, right and left, and the front surface of the bottom chassis is closed by the front plate. Since it is detached, it can also block external radio waves entering from the front panel side, further enhance the shielding effect, and because the front plate is integrally formed with the bottom plate of the bottom chassis, the number of parts can be reduced. Does not increase, and the manufacturing cost can be reduced to the same extent as before.

Further, since the lower surface of the ridge formed substantially over the entire width near the front edge of the top plate abuts against the front plate, it is likely to enter from between the top plate and the front plate. External radio waves can be reliably blocked, and the projections can be reinforced so that the top plate is not bent.

Further, since the upper surface of the bent plate integrally projecting over substantially the entire width of the front plate portion is elastically brought into contact with the ridge portion of the top plate portion, a gap between the front plate portion and the top plate portion is provided. Even if there is an error in the interval, the error can be absorbed and the shielding effect can be maintained more reliably.

Furthermore, the front panel can be easily positioned on the front surface of the bottom chassis simply by fitting the projections of the printed circuit board locking members projecting from the back surface of the front panel into the respective through holes of the front plate portion. It can be locked so that it does not accidentally swing up, down, left and right, and the printed circuit board locking member is also used for positioning and locking of the front panel and locking of the printed circuit board. The structure is simpler and the production cost is lower.

Then, by simply inserting the upper locking pieces and the horizontal locking pieces into the front panel from diagonally rearward to make them horizontal, the top panel of the top cover and both side plates are integrated with the front panel. Can be locked.

According to the second aspect of the present invention, the engaging portions of the upper projections projecting from the rear surface of the front panel are engaged with the bent pieces integrally projecting from the upper end of the front plate. And the front panel is integrally connected to the front plate simply by engaging the engagement portion of each lower protruding piece with the engaged portion of the bottom plate through each opening of the front plate. can do.

According to the third aspect of the present invention, each of the lower surface contacting pieces projecting rearward from the lower edge portion of the front panel is brought into contact with the lower surface of the bottom plate portion, so that the front panel is lifted and detached from the bottom plate portion. Can be prevented.

According to the fourth aspect of the present invention, the bottom chassis and the top cover can block external radio waves entering from above, below, right and left, and the front surface of the bottom chassis is closed by the front plate. Therefore, external radio waves entering from the front panel side can be blocked, and the shielding effect can be further enhanced. Further, since the front plate portion is formed integrally with the bottom plate portion of the bottom chassis, the number of parts does not increase, and the manufacturing cost can be reduced to the same extent as the conventional case.

According to the fifth aspect of the present invention, the lower surface of the ridge formed over substantially the entire width in the vicinity of the front edge of the top plate abuts on the front plate, so that the top plate and the front plate are in contact with each other. It is possible to reliably block an external radio wave that is going to intrude from between the upper and lower portions, and it is also possible to reinforce the top plate portion so as not to bend by the protrusion.

According to the sixth aspect of the present invention, the upper surface of the bent plate integrally projecting over substantially the entire width of the front plate portion is elastically brought into contact with the ridge portion of the top plate portion. Even if there is an error in the interval between the part and the top plate part, absorb the error,
The shielding effect can be maintained more reliably.

According to the seventh aspect of the present invention, the front panel can be easily mounted on the front surface of the bottom chassis only by fitting a plurality of projections projecting from the rear surface of the front panel into the respective through holes of the front plate. And can be locked so that it does not unexpectedly swing up, down, left, or right.

According to the eighth aspect of the present invention, a plurality of projections for positioning and locking the front panel are formed integrally with the printed board locking member projecting from the back surface of the front panel. Since the locking member is used for both positioning and locking of the front panel and locking of the printed circuit board, the structure is simplified and the manufacturing cost is reduced by the shared use.

According to the ninth aspect of the present invention, the upper locking piece having a substantially J-shaped cross section provided at the front edge of the top plate portion is inserted obliquely from the rear into the front panel so as to be horizontal.
The top plate can be integrally locked to the front panel.

According to the tenth aspect of the present invention, the front panel can be obtained by simply inserting both L-shaped lateral locking pieces provided at the front edges of both side plates of the top cover into the front panel. The two side plates of the top cover can be integrally locked.

According to the eleventh aspect of the present invention, the engaging portions of the upper projections projecting from the rear surface of the front panel are engaged with the bent pieces integrally projecting from the upper end of the front plate. , The upper portion of the front panel can be integrally connected to the upper end of the front plate portion.

According to the twelfth aspect of the present invention, the engaging portions of the lower projecting pieces projecting from the rear surface of the front panel are engaged with the engaged portions of the bottom plate through the respective openings of the front plate. Just by doing so, the lower part of the front panel can be integrally connected to the bottom plate part.

According to the thirteenth aspect of the present invention, the front panel is lifted off the bottom plate by contacting the lower surface contact pieces projecting rearward from the lower edge of the front panel to the lower surface of the bottom plate. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a side view showing an electric device housing according to an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a bottom view of the same.

FIG. 4 is an exploded perspective view of the same.

FIG. 5 is a view as viewed in the direction of arrows AA in FIG. 1;

6 is a view taken in the direction of arrows BB in FIG. 2;

FIG. 7 is a view taken in the direction of the arrows CC in FIG. 2;

FIG. 8 is a side view showing a conventional example.

FIG. 9 is a view as seen in the direction of arrows DD in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bottom chassis 1a Bottom chassis bottom plate part 1b Bottom chassis side plate part 2 Front panel 3 Top cover 3a Top cover top plate part 3b Top cover side plate part 10 Front plate part 11 Protrusion part 12 Folding plate 14 Through hole 15 Printed circuit board locking member 15a Projection 18 Upper locking piece 18a End plate portion of upper locking piece 18b Inclined plate portion of upper locking piece 19 Side locking piece 19a End plate portion of horizontal locking piece 19b Side Projection plate portion of locking piece 21 Folding piece 21a Engaging claw (engaged part) of bent piece 22 Opening 22 23 Upper protruding piece 23a Engaging hole (engaging part) of upper protruding piece 24 Lower protruding piece 24a Projecting portion (engaging portion) of lower projection piece 25 Engaging hole (engaged portion) 28 Lower surface contact piece 29 Fastener

Claims (13)

[Claims] 1. A synthetic resin front panel is fitted to a front surface of a steel plate bottom chassis having a bottom plate portion and a pair of left and right side plate portions bent upward from both side edges of the bottom plate portion, and a top plate portion and the top plate A top cover made of steel having a pair of left and right side plates bent downward from both side edges of the bottom portion, the upper cover being bent upward from a front edge of the bottom plate. A front plate portion for closing the front surface of the bottom chassis is provided. By bending a portion near the front edge of the top plate portion downward, a ridge portion is formed over substantially the entire width near the front edge, and the front plate portion is formed. A bent plate that bends rearward from the upper end of the portion is integrally protruded over substantially the entire width of the front plate portion, elastically abuts the lower surface of the ridge portion, and a plurality of through holes are formed in the front plate portion. Is pierced The projections of a plurality of printed circuit board locking members projecting from the back surface of the front panel are fitted into the respective through holes, and an end plate bent downward from the front edge of the top plate. An inclined plate portion extending obliquely upward from the lower end of the end plate portion toward the front, having an upper locking piece having a substantially J-shaped cross section fitted into the front panel, and both side plates of the top cover; A lateral locking piece having a substantially L-shaped cross-section, which is fitted into the front panel and includes an end plate portion bent inward from a front edge of the portion and a protruding plate portion extending forward from the end plate portion. A housing for electrical equipment, characterized by having: 2. A plurality of bent pieces bent rearward from an upper end portion of the front plate portion are integrally protruded at predetermined intervals along a width direction of the front plate portion, and the front plate portion is provided. A plurality of openings are formed at predetermined intervals along the width direction of the front plate portion at a lower end of the front panel, and a plurality of upper protrusions and each opening facing the respective bent pieces are provided on the back surface of the front panel. A plurality of lower protruding pieces opposing to each other, the engaging portions provided on the respective upper protruding pieces are engaged with the engaged portions provided on the respective bent pieces, and the respective lower protruding pieces are provided. 2. An electric device as claimed in claim 1, wherein each of said lower projections is fitted into said opening so that an engagement portion provided on each of said lower projections is engaged with an engaged portion provided on said bottom plate. Housing. 3. The electric apparatus according to claim 1, wherein a plurality of lower surface contact pieces are provided which project rearward from a lower edge of the front panel and abut against a lower surface of the bottom plate. Housing. 4. A synthetic resin front panel is fitted to the front surface of a steel bottom chassis having a bottom plate and a pair of left and right side plates bent upward from both side edges of the bottom plate, and a top plate and the top plate A top plate made of steel having a pair of left and right side plate portions bent downward from both side edges of the bottom portion, the upper cover being bent upward from a front edge of the bottom plate portion. A housing for electrical equipment, wherein a front plate portion is provided to close a front surface of the bottom chassis. 5. A ridge portion is formed over substantially the entire width of the vicinity of the front edge by bending a portion near the front edge of the top plate portion downward, and a lower surface of the ridge portion is connected to the front plate portion. 5. The housing for an electric device according to claim 4, wherein the housing is in contact with the housing. 6. A bent plate that bends rearward from an upper end of the front plate portion over substantially the entire width of the front plate portion, and an upper surface of the bent plate is elastically attached to a lower surface of the ridge portion. 6. The electrical equipment casing according to claim 5, wherein the electrical equipment casing is brought into contact with each other. 7. A plurality of through holes are provided in the front plate portion,
7. The electrical equipment casing according to claim 4, wherein a plurality of projections projecting from the back surface of the front panel are fitted into the respective through holes. 8. The electrical equipment casing according to claim 7, wherein the plurality of projections are formed integrally with a printed board locking member protruding from a back surface of the front panel. 9. An end plate portion bent downward from a front edge of the top plate portion and an inclined plate portion extending obliquely upward and forward from a lower end of the end plate portion and fitted into the front panel. The electrical device casing according to any one of claims 4 to 8, further comprising an upper locking piece having a substantially J-shaped cross section. 10. A cross-section fitted into a front panel, comprising an end plate portion bent inward from the front edges of both side plate portions of the top cover, and a protruding plate portion extending forward from the end plate portion. The electrical device casing according to any one of claims 4 to 9, further comprising a lateral locking piece having a substantially L-shaped surface. 11. A plurality of bent pieces bent rearward from an upper end portion of the front plate part are integrally protruded at predetermined intervals along a width direction of the front plate part. A plurality of upper protruding pieces are protrudingly provided on the back surface of the front panel so that the engaging portions provided on the respective upper protruding pieces are engaged with the engaged portions provided on the respective bent pieces. The housing for an electric device according to any one of claims 4 to 10, wherein: 12. A plurality of openings are formed at predetermined intervals along a width direction of the front plate portion at a lower end portion of the front plate portion,
A plurality of lower protruding pieces are protrudingly provided on the back surface of the front panel so as to face the respective openings, and the respective lower protruding pieces are inserted into the respective openings to provide engagement with the respective lower protruding pieces. The electric device casing according to any one of claims 4 to 11, wherein the portion is engaged with an engaged portion provided on the bottom plate portion. 13. A plurality of lower surface contact pieces projecting rearward from a lower edge portion of the front panel and abutting against a lower surface of the bottom plate portion.
The electrical equipment casing according to any one of the above.