JPH07302984A - Fitting structure of enclosure - Google Patents

Abstract

PURPOSE:To obtain a fitting structure whose fitting strength is enhanced by a method wherein a claw part which is formed at a cover is force-fitted to a recessed part which is formed at a chassis, the claw part is bent inside the recessed part, extended parts on both sides of the claw part are bent in the recessed part and the extended parts are brought into contact with sidewalls in the recessed part at the chassis. CONSTITUTION:In a cover 11, claw parts 15 which have been formed by a stamping operation by means of a press are formed, in two parts each, at lower parts of two faces, i.e., one side face 16 on the cover and a side face opposite to it. In a chassis 12, recessed parts 18 to which the claw parts 15 at the cover 11 are force-fitted, bent and coupled are formed in four parts which correspond to the individual claw parts 15 at the cover 11 in bottom peripheral edge parts of the chassis 12. The claw parts 15 come into contact with upper parts of the recessed parts 18, extended parts 33 hit edge parts and sidewalls of the recessed parts 18, they are bent, they come into contact with the sidewalls of the recessed parts 18, the chassis 12 and the cover 11 are fitted, and the assembly operation of an enclosure is completed Thereby, the enclosure can be fitted surely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing structure, and more particularly to a housing fitting structure composed of a cover and a chassis.

[0002]

2. Description of the Related Art A conventional housing, for example, a metal housing for accommodating a printed circuit board on which electronic components and the like are mounted, has a two-body structure including a cover and a chassis. FIG. 6 is an exploded perspective view showing a structure of a case including a cover and a chassis of a conventional example, and FIG. 7 is a schematic cross-sectional view of a state where the case is assembled.

The housing 61 comprises a metallic cover 62 and a metallic chassis 63, and a claw 65 is formed at the center of the lower end of each side surface 64 of the cover 62. The chassis 63 which covers the cover 62 and constitutes the housing 61 includes
Protrusions 66 having a predetermined height are provided at the four corners, and further, the protrusions 66 are provided with screw holes (burring or the like) 67. In addition, a printed circuit board 68 on which electronic components and the like are mounted
In this case, insertion holes 69 for inserting screws 71 for screwing the printed circuit board 68 to the chassis 63 are provided near the four corners.

A method of accommodating the printed circuit board 68 in the housing 61 in the housing thus constructed will be described. First, the insertion hole 69 of the printed circuit board 68 and the chassis 63
The screw holes (burring or the like) 67 are aligned with each other and the screws 71 are tightened in the screw holes (burring or the like) 67 to fix the printed circuit board 68 to the chassis 63. Next, the cover 62 is covered on the chassis 63 from the printed circuit board 68 side, and the claws 65 are bent inwardly at a substantially right angle toward the lower side of the chassis 63 so that the claws 65 are engaged with the chassis 63, and the cover 62 is covered. It is fitted to the chassis 63.

[0005]

However, in the conventional housing fitting structure as described above, in order to securely fit the housing, in order to prevent the front and rear and left and right movements of the bent portion of the claw, It is necessary to provide one or more claws on each side. Therefore, there is a problem that the number of steps for bending the claws increases and the assembling work becomes complicated. Further, in the conventional fitting structure of the housing, there is a problem that the claw is slightly returned to its original state due to the elasticity of the material after bending the claw, that is, so-called spring back occurs, and the fitting becomes unsatisfactory. An object of the present invention is to solve such a problem, to improve the efficiency of assembly work, reduce the number of parts, and improve the fitting strength.

[0006]

The present invention achieves the above-mentioned object, and in a fitting structure of a housing composed of a cover and a chassis, the recess provided in the chassis and the recess provided in the cover are provided. A claw portion that is bent into the recess provided in the chassis to engage the cover and the chassis, and is extended to a side of the claw portion, and the claw portion is bent into the recess. An extension portion that bends with respect to the claw portion and abuts the side wall of the recess, and after the cover and the chassis are aligned, the claw portion is press-fitted into the recess to press the claw portion. And the extending portion is bent, the claw portion and the recess are engaged with each other, and the extending portion is brought into contact with the side wall of the recess.

According to a second aspect of the present invention, the claw portion is integrally formed with the cover, and a first notch hole for facilitating bending of the claw portion is provided between the claw portion and the cover portion. It is characterized by A third aspect of the invention is characterized in that a second cutout hole that facilitates bending of the extending portion is provided between the claw portion and the extending portion.

[0008]

According to the present invention, when the claw portion provided on the cover is press-fitted into the concave portion provided on the chassis, the claw portion is bent into the concave portion, and further, the extending portions are provided on both sides of the claw portion. The installation portion is also bent into the recess, and the extension portion abuts the side wall of the recess of the chassis. Therefore, the fitting strength between the chassis and the cover is increased.

According to the second invention, the claw portion and the cover, which are integrally formed, can be easily bent by being guided by the second cutout hole by the first cutout hole. Therefore, the claw portion can be easily bent along the concave portion. Further, according to the third invention, by the second notch hole,
Since the bent portion is easily bent by being guided by the first notch hole, the extending portion can be easily bent along the concave portion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a housing according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in a state where the housing is assembled. Also, FIGS. 3 (a) and 3 (b)
[Fig. 6] is a front view of a cover claw before and after assembly. Further, FIG. 4A is a partial cross-sectional view (non-cutting of the claw portion) taken along the line BB before the engagement of the claw portion of the cover and the concave portion of the chassis, and FIG.
FIG. 7 is a cross-sectional view taken along the line CC of the cover after the engagement of the claw and the recess of the chassis.

Reference numeral 11 is a cover, and 12 is a chassis, which is formed by pressing metal such as an iron plate. A chassis 13 is formed by the chassis 12 and the cover 11 covering the chassis 12, and a printed circuit board 14 on which electronic components and the like are mounted is housed in the chassis 13. Cover 11
Has a claw portion 15 formed by punching with a press.
Are provided at two locations on the lower side of one side surface 16 of the cover 11 and two side surfaces facing the side surface 16. Specifically, as shown in FIGS. 3 and 4A, the claw portion 15 is provided at a position corresponding to a recess 18 of the chassis 12 described later. Further, extending portions 33 are integrally provided on both sides of the claw portion 15 when the claw portion 15 is press-molded. Further, the notch holes 31 and 32 for easily and accurately bending the claw portion 15 with respect to the cover 11 and the extending portion 33 with respect to the claw portion 15 are provided at the same time when the claw portion 15 is press-molded. .

Incidentally, the A dimension of the claw portion 15 is made slightly shorter than the depth dimension of the concave portion 18 so that it does not come into contact with the inner wall of the concave portion 18 of the chassis 12 when folded, and the B dimension is the extended portion when bent. 33 is formed to have a length (slightly smaller than the width of the recess 18) so as to strongly contact both side walls of the recess 18. Further, the C dimension of the extension portion 33 is formed so as not to project from the bottom surface of the chassis 12 when bent (slightly shorter than the height of the concave portion 18). Further, the cover 11 is provided with protruding surfaces 17 on the inner surface by recessing the four corners inward, and is formed so that the upper surfaces of the four corners of the printed circuit board 14 abut.

The chassis 12 has a claw portion 15 of the cover 11.
The recess 18 for press-fitting and bending-engaging the
It is provided at four locations on the peripheral edge of the bottom surface of 2 corresponding to the claw portions 15 of the cover 11. Further, the upper edge portion 19 is formed so as to contact the lower edge portion of the printed board 14 and hold the printed board 14 together with the protruding surface 17 of the cover 11 from above and below. In addition, at two locations near the center of the upper edge portion 19 on the two opposite side surfaces of the chassis 12,
A protrusion 20 extending upward is provided for regulating the position of the printed board 14.

The printed circuit board 14 has an outer circumference that is substantially the same as the outer circumference of the chassis 12, and has a shape and size that are close to the inner surface of the cover 11, and the projection 20 is engaged with a position corresponding to the projection 20 of the chassis 12. The engaging portion 21 for
It is formed by a recess slightly larger than zero. To assemble the fitting structure of the housing having the above-described configuration, the chassis 12
The engaging portion 21 of the printed circuit board 14 is fitted into the protrusion 20 of the printed circuit board 14 to attach the printed circuit board 14 to the upper peripheral edge portion 19 of the chassis 12.
Place on top. Then, the cover 11 is placed on the chassis 12 from above so that the projections 17 of the cover 11 come into contact with the upper surfaces of the four corners of the printed circuit board 14 so that the claw portions 15 of the cover 11 overlap the recesses 18 of the chassis 12. Next, the claw portions 15 at the four positions are bent by pressing the chassis 12 into the concave portion 18. Specifically, as shown in FIGS. 3 and 4B, when the claw portion 15 is bent inward by a jig or the like of a predetermined size until it comes into contact with the upper surface of the recess 18 of the chassis 12, The portion 15 abuts on the upper surface of the recess 18, and the extended portion 33 abuts the edge and side wall (side surface) of the recess 18 and bends to abut the side wall of the recess 18, so that the chassis 12 and the cover 11 are fitted to each other. Body assembly is complete.

As described above, according to this embodiment,
Since the printed circuit board 14 is sandwiched in the housing 13 by the projecting surfaces 17 of the cover 11 and the upper end peripheral portion 19 of the chassis 12 that are in contact with the upper surfaces of the four corners of the printed circuit board 14, a screw for fixing the printed circuit board 14 is provided. And the like, and the fitting work is not necessary, and since the fitting is performed by the engagement between the claw portion 15 and the recessed portion 18 and between the extended portion 33 and the recessed portion 18, the fitting is ensured, and By the engagement of the extended portion 33, the movement of the recess 18 in the width direction is suppressed, so that the claw portion on all side surfaces (the side surface adjacent to the side surface where the recess 18 is provided),
Since it is not necessary to provide an engaging structure such as a recess, it is possible to reduce the number of parts or the number of assembly work steps. Further, the engagement between the extended portion 33 and the recess 18 suppresses the springback after the claw bending work, so that the reduction of the fitting strength due to the springback can be prevented.

FIG. 5A is a front view before assembling the claw portion of the cover of the housing in another embodiment, and FIG.
It is a typical side view after engagement of a claw part of a cover and a crevice of a chassis. In the above-described embodiment, the concave portion 18 is provided on the peripheral portion of the bottom surface of the chassis 12, but in the present embodiment, the concave portion 51 is provided at a portion slightly apart from the bottom surface of the chassis 52, and the cover 53 is further provided.
The claw 54 has an upper extension 55. Further, in the above-described embodiment, the notch holes 31 and 32 are provided to facilitate the bending of the claw portion 15 and the extension portion 33, but in the present embodiment, the notch holes 31 and 32 are further bent along the folding curve 56 of the upper extension portion 55. A small bent hole 57 is opened for ease. Therefore,
According to the present embodiment, the upper extended portion 55 comes into contact with the upper surface 58 (in some cases, also on the inner surface) of the recessed portion 51, the fitting strength is improved, and the vertical movement is restricted by other means. It can be suppressed without a structure. It should be noted that the recess 51 may be provided at any position on the side surface of the chassis 52. In that case, the claw 54 of the cover 53 may be provided at a position corresponding to the recess 51. Further, in the above-described embodiment, the claw portion 15 of the cover 11 is bent so as to be pushed up,
It is also possible to bend it so that it is pushed down in the opposite direction.

[0017]

As described above in detail, in the fitting structure of the housing according to the present invention, the extending portions provided on both sides of the claw portion come into contact with the side wall (side surface) of the concave portion of the chassis. Therefore, the movement of the recess in the side wall direction can be suppressed, and the number of contact portions between the chassis and the cover increases, so that the housing can be reliably fitted.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a housing according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA in a state where the housing in FIG. 1 is assembled.

FIG. 3 is a front view of a claw portion of a cover of a housing, (a) is a front view before assembly, and (b) is a front view after assembly.

FIG. 4 is a cross-sectional view showing a claw portion of the cover and a recessed portion of the chassis in FIG. 3, FIG.
B is a partial cross-sectional view (without cutting the claw portion). (B) is CC sectional drawing after engagement of a claw part and a recessed part.

FIG. 5 is a view showing a fitting structure of a housing in another embodiment of the present invention, (a) is a front view of a cover claw portion before assembly,
(B) is a typical side view after the engagement of the claw portion and the concave portion.

FIG. 6 is an exploded perspective view showing a structure of a housing including a cover and a chassis of a conventional example.

FIG. 7 is a schematic cross-sectional view of a state where a conventional casing is assembled.

[Explanation of symbols]

 11 Cover 12 Chassis 13 Housing 14 Printed Circuit Board 15 Claw Part of Cover 11 16 One Side of Cover 11 17 Projecting Surface of Cover 11 18 Recess of Chassis 12 19 Upper Edge Perimeter of Chassis 12 20 Projection of Chassis 12

Claims (3)

[Claims] 1. A fitting structure for a housing comprising a cover and a chassis, wherein a recess provided in the chassis and a recess provided in the cover and bent in the chassis are bent to form the cover and the cover. A claw part that engages with the chassis, and extends laterally of the claw part. When the claw part is bent into the recess, the claw part bends with respect to the claw part and contacts the side wall of the recess. An extension part, and after fitting the cover and the chassis, the claw part is press-fitted into the recess to bend the claw part and the extension part, and the claw part and the recess are engaged with each other. A housing fitting structure, wherein the extended portion is brought into contact with a side wall of the recess. 2. The claw portion is integrally formed with the cover,
The fitting structure for a housing according to claim 1, wherein a first notch hole is provided between the claw portion and the cover portion to facilitate bending of the claw portion. 3. The fitting of the housing according to claim 1, wherein a second notch hole is provided between the claw portion and the extension portion to facilitate bending of the extension portion. Construction.