JPH0521475U - Electronic device housing - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a housing for an electronic device which is easily assembled. [Constitution] A printed circuit board is attached along a substantially rectangular bottom surface, and a chassis (4) provided with left and right side surfaces facing each other on the bottom surface and a back side surface sandwiched between the left and right side surfaces.
0), a plane attached to the chassis and parallel to the bottom surface, and a cover (30) having a cover side surface to be attached as a front side surface of the bottom surface. The chassis is provided with a latch hole (47), a screw hole (48) and a square hole (49), and the cover is a latch portion (34), an opening portion (35) and a convex side portion (37).
Is provided. At the time of assembly, engage the convex side with the square hole, then lock the latch part with the latch hole, temporarily fix the cover to the chassis, and finally screw in the opening and screw hole. Fasten them by screwing them together.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electronic device housing having a printed circuit board, and more particularly to simplifying an assembly work.

[0002]

[Prior Art]

 The applicant has proposed, for example, in Japanese Utility Model Laid-Open No. 2-50625, a housing for an electronic device including an inner base and a case. FIG. 6 is an assembly view of a conventional device in which the cover 10 is attached to the chassis 20. Edges are provided on three sides of the four sides of the cover 10 excluding the front side, and two screw holes 12 are provided near the edgeless side on the upper surface. Two pawls 14 are provided on the edge of the side opposite to the edgeless side (edge on the back surface). A tab portion 22 that abuts the screw hole 12 is provided on the opening surface of the chassis 20, and the screw 16 is screwed into the tab portion 22. The chassis 20 has a rear surface provided with an engagement hole 24 into which the pawl portion 14 is locked.

In such a device, the pawl portion 14 is locked in the engagement hole 24, then the screw hole 12 is aligned with the tab portion 22, and the screw 16 is screwed. As a result, the cover 10 is attached to the chassis 20.

[0004]

[Problems to be solved by the device]

 However, in the structure shown in FIG. 6, if the screws are not screwed, the cover 10 may easily come off the chassis 20, which may cause inconvenience during the assembly work. Moreover, the structure disclosed in the prior application accommodates a plurality of printed circuit boards. For example, when only one printed circuit board is accommodated in a power supply device, the heat dissipation characteristics are good and the assembly is good. The structure was desired. The present invention solves such a problem, and an object thereof is to provide a housing for electronic equipment which is easy to assemble.

[0005]

[Means for Solving the Problems]

 The present invention that achieves such an object is such that a printed circuit board is attached along a bottom surface of a substantially rectangular shape, and a chassis provided with left and right side surfaces facing each other on the bottom surface and a back side surface sandwiched between the left and right side surfaces. An electronic device casing having a flat surface attached to the chassis and parallel to the bottom surface, and a cover having a cover side surface to be attached as a front side surface of the bottom surface. It was done.

That is, in the chassis, the edges of the left and right side surfaces are bent inside the housing in parallel with the bottom surface, and the latch holes provided on the back and back side of this edge and the edges It has a screw hole provided approximately in the center and a square hole provided in a line at the edge of the bottom surface on the front side surface side. In addition, the cover is provided at a latch portion that is engaged with the latch hole provided on the back side surface of the plane and at a position that is an edge on the left and right side surfaces of the plane and is in contact with the screw hole. And a convex side portion provided at a position to be inserted into the square hole on the bottom surface side of the cover side surface.

[0007]

[Action]

 The components of the present invention have the following functions. Engage the convex side with the square hole and then latch the latch with the ratch hole to temporarily fix the cover to the chassis. Next, screws are screwed into the openings and the screw holes, and both are permanently fixed.

[0008]

【Example】

 The present invention will be described below with reference to the drawings. FIG. 1 is a configuration perspective view showing an embodiment of the present invention. In the figure, a chassis 40 has a substantially rectangular bottom surface 41, a left side surface 42 and a right side surface 43 provided on the long side of the bottom surface 41, and a back side surface 46 provided on the rear short side. There is. Each of the left and right side surfaces 42, 43 is formed with three punching portions 44 consisting of a pair of arches, and a printed circuit board is mounted between the arches of the punching portions 44. The board support base 45 is provided substantially at the center of the bottom plate 41, and holds the printed board in parallel with the bottom surface 41 together with the embossing section 44. The left and right side surfaces 42, 43 are provided with edges 53, 54 parallel to the long sides of the bottom surface 41, and the left and right side edges 53, 54 are bent in a state parallel to the bottom surface 41. The latch holes 47 are provided on the back side 46 side of the left and right side edges 53, 54, and one screw hole 48 is provided at each of the left and right side edges 53, 54 substantially at the center. The square holes 49 are provided in the vicinity of the short side on the front side of the bottom surface 41 and in parallel with the short side. Here, three square holes 49 are arranged in a vertical line. The tag portion 50 is provided at two places on the short side on the front side of the bottom surface 41, and is used when fixing this case to a rack or the like. The hypotenuse 51 is formed by notching the short side on the front side of the left and right side surfaces 42,43 and the angle formed by the left and right side edges 53,54. It was installed near the corner.

The cover 30 has a flat surface 31 mounted in parallel with the bottom surface 41, a cover side surface 32 mounted on the front side short side of the bottom surface 41 and the left and right side edges 53, 54, and between the both surfaces 31, 32. Has a slope 33 for communicating with each other. The latch portion 34 is provided on the long side of the flat surface 31 near the back side surface 46 and engages with the latch hole 47. The opening 35 is provided at a position facing the left and right side edges 53, 54 of the flat surface 31, and is used for screwing the screw 16 in cooperation with the screw hole 48. Since the window portion 36 is provided on the slope 33, it is used for connecting the built-in printed circuit board to the outside, for example, for connecting a connector. The convex side portion 37 is provided on the side of the cover side surface 32 on the side of the bottom surface 41, and is fitted into the square hole 49. The notch 38 is provided near the corner of the cover side surface 32 and the slope 33, and engages with the pawl portion 52.

FIG. 2 is a side view of the cover 30, in which (A) shows a case where the bending angle cross control is positive and (B) shows a negative case. Here, the cover 30 is bent in two steps, the angle α is the angle formed by the cover side surface 32 and the slope 33, and the angle β is the angle formed by the plane 31 and the slope 33. When the tolerance control is positive with respect to the bending angles of the angles α and β, the locking piece 343 of the latch portion 34 faces the opposite side to the cover side surface 32. On the other hand, when the tolerance control is negative, the locking piece 343 of the latch portion 34 faces the cover side surface 32 side. The cover 30 may be bent in one step and the slope 33 may be omitted.

FIGS. 3A and 3B are perspective views of the main parts for explaining the engagement relationship between the latch hole 47 and the latch portion 34. FIG. 3A shows the state before engagement and FIG. 3B shows the state after engagement. The latch hole 47 is formed by notching both the left side surface 42 and the left side surface edge 53, and has a quadrilateral shape here. The latch portion 34 is provided with a protrusion on the flat surface 31, and a notch 341 is provided at the base of the protrusion to facilitate bending of the bending surface 342. The bent surface 342 is substantially parallel to the left side surface 42, and the locking piece 343 is provided in the direction described with reference to FIG.

In such a configuration, first, the latch portion 34 is moved in the direction of arrow A to be loosely inserted in the latch hole 47, and then is moved in the direction of arrow A ′ which is perpendicular to the direction of arrow A to move the locking piece 343. Are engaged with the latch holes 47. As a result, the cover 30 is temporarily fixed to the chassis 40.

FIG. 4 is a perspective view of the essential parts for explaining the engagement relationship between the square hole 49, the convex side portion 37, and the pawl portion 52 and the notch portion 38. The convex side portion 37 is inserted into the square hole 49. At this time, the notch portion 38 and the pawl portion 52 are engaged with each other, and the engagement between the convex side portion 37 and the square hole 49 is further strengthened. This means that the notch portion 38 and the convex side portion 37 having a protrusion amount commensurate with the manufacturing tolerance of the notch portion 38 are provided.

FIG. 5 is an explanatory view of a state in which the cover 30 is attached to the chassis 40. (A) shows a state in which the convex side portion 37 is inserted in the square hole 49, and (B) rotates in the direction of arrow B. It represents the state. When the convex side portion 37 is inserted into the square hole 49 and the cover 30 is rotated in the direction of the arrow B, the claw portion 52 and the notch portion 38 are engaged with each other, and the latch hole 47 and the latch portion 34 are locked. .. At this time, it is preferable that a barring force is generated in association with the engagement between the latch hole 47 and the latch portion 34. For example, if the distance between the convex side portion 37 and the latch portion 34 is made slightly larger than the distance between the square hole 49 and the latch hole 47, the spring force will be increased when the cover 30 is temporarily fixed to the chassis 40. Occur. In this state, the screw hole 48 and the opening 35 are aligned with each other, so that the screw 16 is used for screwing and final fixing.

[0015]

[Effect of the device]

 As described above, according to the present invention, the convex side portion 37 is inserted into the square hole 49, and the pawl portion 52 and the notch portion 38 are engaged and temporarily fixed, so that the case is not reversed. The cover 30 does not fall off the chassis 40, which facilitates the assembly work. In addition, screwing by screws also requires a small fastening force due to the fact that it cooperates with temporary fixing, which improves assembly.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of an embodiment of the present invention.

FIG. 2 is a side view of a cover 30.

FIG. 3 is a perspective view of a main part configuration for explaining an engagement relationship between a latch hole 47 and a latch portion 34.

FIG. 4 is a perspective view of a main configuration for explaining an engagement relationship between a square hole 49, a convex side portion 37, a pawl portion 52 and a cutout portion 38.

FIG. 5 is an explanatory diagram showing a state in which the cover 30 is attached to the chassis 40.

FIG. 6 is an assembly view of a conventional device.

[Explanation of symbols]

 30 ... Cover 34 ... Latch 35 ... Opening 37 ... Convex side 40 ... Chassis 47 ... Latch hole 48 ... Screw hole 49 ... Square hole

Claims (1)

[Scope of utility model registration request] 1. A printed circuit board is attached along a substantially rectangular bottom surface, and left and right side surfaces (42, 43) facing each other on the bottom surface (41) and a back side surface (46) sandwiched between the left and right side surfaces are provided. Chassis (40) and this chassis
A flat surface (3
1) and a cover (30) having a cover side surface (32) attached as a front side surface of the bottom surface, wherein the left and right side edges are parallel to the bottom surface inside the housing. Latch hole (47) provided on the back and back side of this edge, a screw hole (48) provided substantially at the center of the edge, and a line at the edge on the front side surface side of the bottom surface. A chassis having a square hole (49) provided on the side, a latch portion (34) engaging with the latch hole provided on the back side of the plane, and edges on the left and right side of the plane. There is an opening (3
5) and the cover having a convex side portion (37) provided at a position to be inserted into the square hole on the bottom side of the side surface of the cover, and an electronic device comprising: Case.