JPS6228797Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chassis for electronic equipment, and particularly to a chassis to which electronic equipment components such as printed circuit boards are attached.

As is well known, a large number of circuit components are attached to printed wiring boards used in electronic devices.
Then, the main body of the circuit component is mounted on the component mounting surface of the printed wiring board in a protruding state, and the terminal of the circuit component is soldered to the wiring pattern with the protruding state on the wiring pattern surface (back side) of the printed wiring board. ing. Therefore, when a printed wiring board or the like is attached to the chassis, it is necessary to configure the printed wiring board to be attached at a position separated from the chassis by a certain space.

FIG. 1 shows a conventional chassis for electronic equipment, in which a bent piece 3 having a substantially L-shaped cross section is integrally provided on a base plate 2 of a chassis 1 made of a sheet metal by bending. The vertical portion 3a of the bent piece 3 is bent upward at a substantially right angle with respect to the substrate portion 2, and the horizontal portion 3b of the bent piece 3 is bent substantially at a right angle to the vertical portion 3a, so that the substrate It is arranged in a substantially horizontal state with respect to part 2. Further, screw insertion holes 4 are provided at appropriate locations in this horizontal portion 3b. Although not shown,
A plurality of bent pieces 3 as described above are provided at appropriate locations on the base plate portion 2.

Thus, as shown in FIG. 1, a printed wiring board 5 is placed on the horizontal portion 3b of the bent piece 3 and fixed with a set screw 6.

However, in the case of such a chassis 1, the printed wiring board 5 is attached to the horizontal portion 3b of the bent piece 3.
When tightening the set screw 6 using a driver 7 as shown in FIG. 2 in order to attach it to the Piece 3
is likely to be forcibly bent in the direction of arrow B in FIG. In addition, if the printed circuit board 5, circuit components, etc. accidentally come into contact with the bending piece 3 during the installation work of the printed circuit board wiring board 5, the bending piece 3 is likely to be deformed accordingly. Therefore, there was a problem in that it was very difficult to attach the printed wiring board 5 to the bent piece 3.

The present invention was devised in order to solve the above-mentioned problems, and even if thrust is applied to the bent part for attaching the part when attaching the part to the chassis, or if the part unexpectedly hits the bent part. The present invention aims to provide a chassis for electronic equipment that is configured to reliably prevent bending and deformation of the bent portions, and to efficiently and reliably perform component mounting operations.

An embodiment in which the present invention is applied to a chassis of a switching regulator will be described below with reference to FIGS. 3 to 9.

As shown in FIG. 3, the chassis 10 is made of a sheet metal, and a component mounting portion 13 is integrally provided on a base plate portion 11 of the chassis 10 by bending. That is,
A U-shaped notch 15 is formed in the edge 11a of the base plate 11 of the chassis 10.
A bent portion 16 having a substantially L-shaped cross section is integrally provided on one side of the holder with a bent portion 17 interposed therebetween. The bent portion 16 having a substantially L-shaped cross section includes a vertical portion 18 bent at a substantially right angle to the substrate portion 11 and a vertical portion 18 bent at a substantially right angle to the vertical portion 18 to the substrate portion 11. The horizontal part 19 is arranged substantially horizontally and is provided with a screw insertion hole 22.
The above-mentioned horizontal portion 19 is configured as a component mounting surface, and the printed wiring board 12 is mounted on this mounting surface. Therefore, the printed wiring board 12 is fixedly arranged at a position separated from the board part 11 by a certain space.

Further, a pair of leg portions 20 and 21 are integrally provided on both sides of the distal end of the horizontal portion 19 of the bent portion 16 by bending. The pair of leg portions 20 and 21 are bent approximately at right angles to the horizontal portion 19 and are suspended toward the substrate portion 11.

On the other hand, as clearly shown in FIGS. 3 and 6, bent pieces 23 and 24 are formed at the lower ends of the pair of leg portions 20 and 21, which are bent at substantially right angles in opposite directions (outward directions). has been done. Furthermore, leg part 2
0 and 21 are provided with cut and raised pieces 25 and 26 corresponding to these bent pieces 23 and 24, respectively. And the above-mentioned bent piece 23 and cut and raised piece 25
And mutually opposing edges 15a, 1 of the U-shaped notch 15 between the bent piece 24 and the cut and raised piece 26
5b is inserted.

On the other hand, the corners of the above-mentioned U-shaped cutout 15 are chamfered to form arcuate surfaces 11b and 11c to facilitate the manufacture of the component mounting portion. Note that these corners 11b and 11c may be chamfered to form linear inclined surfaces.

Further, although not shown in the drawings, the chassis 10 is provided with a plurality of component mounting portions 13 having the above-described structure at appropriate locations.

Next, the procedure for forming the above-mentioned component mounting portion 13 will be explained with reference to FIGS. 5 to 9.

First, by pressing a sheet metal, a bending line 28 is formed on the substrate portion 11 as shown in FIG.
A sheet metal member 10' is manufactured in which a T-shaped component mounting portion 13' is integrally connected via a T-shaped component mounting portion 13'.
By this press working, notches 29 and 30 are respectively formed between the board part 11 and the component mounting part 13, and a screw insertion hole 22 is formed, and at the same time, U-shaped notches 31 and 32 are formed. Form.

Thereafter, the T-shaped component attachment portions 13' are bent downward along the pair of bending lines 33 and 34, respectively, at substantially right angles to form the leg portions 20 and 21 (see FIG. 6). . At this time, as shown in FIG. 6, the bent pieces 23 and 24 are formed by bending them at substantially right angles in opposite directions (toward the outside) along the bending lines 35 and 36, respectively, and the above-mentioned cuts are made. piece 25' formed by 31, 32;
26' is bent outward along bending lines 39 and 40 to form cut and raised pieces 25 and 26, respectively.

Next, as shown in FIG.
1, thereby forming a vertical portion 18 and a horizontal portion 19, respectively. Along with this, as shown in Figures 7 and 8,
The legs 20 and 21 are the U-shaped notches 15 in the base plate 11.
The fold line 3 of the cut and raised pieces 25 and 26
The portions 9 and 40 are brought into contact with the lower surface of the substrate portion 11.

Under this condition, the pair of legs 20, 21
As shown in FIG. 9, a bar-shaped push-up member 43 is inserted into the recess formed by the and horizontal portion 19, and the tip of this push-up member 43 pushes the horizontal portion 19 upward. In this case, the width l ₁ of the push-up member 43
(See Figure 9) is the width l ₂ between the pair of legs 20 and 21
(See Figure 8). Therefore, when pushing up the horizontal portion 19 with the push-up member 43, as shown in FIG.
are guided by the arcuate surfaces 11b and 11c of the base plate 11, respectively, while the legs 20 and 21 are bent at the bent portion 20.
Due to the elasticity of a and 21a, they are bent in the directions of arrows C and C', respectively. In addition, at this time,
The cut and raised pieces 25 and 26 will be crimped to the notch 15 of the base plate part 11, but these cut and raised pieces 2
Since the lengths 5 and 26 are much shorter than the lengths of the legs 20 and 21, the cut and raised pieces 25 and 26 remain in their cut and raised state.

In this way, the horizontal portion 19 continues to be pushed up, and the cut and raised pieces 25 and 26 climb over the base plate portion 11, and at the same time, the leg portions 20 and 21 move to the bent portions 20a and 20.
It is elastically returned to its original position by the elastic restoring force of 1a. As a result, as shown in FIG. It is arranged between the bent piece 24 and the lower end surface 26a of the cut and raised piece 26, and is sandwiched therebetween.

According to the chassis 10 configured in this manner, the component mounting portion 13 is reinforced by the pair of legs 20 and 21. Therefore, as shown in FIG.
9 using a screwdriver 45 or the like with the set screw 46, even if a fairly large thrust in the direction of arrow A is applied to the component mounting portion 13 through the driver 45, the component mounting portion 13 will not There is no risk of it being bent and deformed. That is, arrow A
When a thrust in the direction is applied to the component mounting portion 13,
Lower end surfaces 2 of cut and raised pieces 25, 26 of legs 20, 21
5a, 26a engage with the base plate 11, this thrust is applied to the pair of legs 20, 21 and the vertical portion 1.
8 will definitely be accepted. Also, when installing the printed wiring board 12, this board 1
2, or even if a circuit component (not shown) attached to this board 12 is accidentally caught on the component mounting portion 13 and a force other than the direction of the arrow A is applied, the legs 20 and 21 will not bend. The engagement between the pieces 23 and 24 and the substrate portion 11 reliably prevents the component mounting portion 13 from bending and deforming.

In this way, bending and deformation of the component mounting portion 13 is reliably prevented even if an acting force is applied in any direction to the component mounting portion 13, so that the work of mounting the printed wiring board 12 to the component mounting portion 13 is performed easily and reliably. becomes possible. Moreover, parts mounting part 1
Since the bending and deformation of the printed circuit board 3 can be reliably prevented, the printed wiring board 12 can be accurately fixed and arranged at a position separated from the board part 11 by a predetermined space.

In particular, when the chassis 10 is configured to be thin in order to reduce the cost of the chassis 10,
The work of forming the component mounting portion 13 is simple, and the chassis 10 made of sheet metal can be effectively reinforced, which is very practical.

Although the present invention has been described above with reference to one embodiment, the present invention is not limited to this embodiment, and various modifications can be made based on the technical idea of the present invention.

For example, in this embodiment, a pair of legs 20,
21, but the present invention is not limited to this, and three or more legs may be provided.
It goes without saying that the present invention is not limited to the chassis of switching regulators, but can also be applied to chassis of various other electronic devices.

As described above, the present invention has the following features: (a) a vertical portion that is integrally provided with the base plate of the chassis and is bent at a substantially right angle to the base plate; (b) a bent portion having a substantially L-shaped cross section, which is formed integrally with both sides of the horizontal portion, and is formed from the horizontal portion to the substrate; (c) bent pieces integrally provided at the lower ends of the legs; (d) at least two legs hanging down toward the lower ends of the legs; a cut and raised piece provided, a part of the base plate is sandwiched between the bent piece of the leg part and the cut and raised piece, and the horizontal part of the bent part is By attaching the parts to the board part, the parts are placed at a position spaced apart from the board part. Therefore, according to the chassis of the electronic device of the present invention, the horizontal portion on which the components are attached is reinforced by the engagement of the bent and raised pieces of the base plate and the legs, making it easier to attach the components. Even if a considerable force is applied to the horizontal portion and other portions from any direction, the horizontal portion will not be bent and deformed. Therefore, the parts can be easily, efficiently, and reliably attached to the chassis, and the parts can be reliably fixed at a position separated from the base plate of the chassis by a predetermined space. . In particular, if the present invention is applied to the case where the chassis is made thinner by using sheet metal etc. in order to reduce the cost of the chassis, it will be possible to reliably reinforce the parts attachment parts, making it very practical and effective. It is.

[Brief explanation of the drawing]

1 and 2 show a conventional chassis for electronic equipment, in which FIG. 1 is a perspective view of the main parts of the chassis, and FIG. 2 is a sectional view taken along the line -- in FIG. 1. 3 to 9 show an embodiment in which the present invention is applied to a chassis of a switching regulator, in which FIG. 3 is a perspective view of the main parts of the chassis, and FIG. 4 is a perspective view of the main part of the chassis. 5 is a perspective view of a sheet metal for manufacturing a chassis, FIG. 6 is a perspective view of the sheet metal with the legs bent, and FIG. A side view for explaining the bending process, Figure 8 is the 7th
9 is a sectional view taken along the - line in the figure, and FIG. 9 is a sectional view similar to FIG. 8, showing a state in which the component mounting portion is pushed up. In addition, in the symbols used in the drawings, 10
... Chassis, 11 ... Board part, 12 ... Printed wiring board, 13 ... Component mounting part, 16 ... Bent part, 18 ... Vertical part, 19 ... Horizontal part, 20,
21... Leg portion, 23, 24... Bent piece, 25,
26...It is a cut and raised piece.

Claims (1)

[Claims for Utility Model Registration] (a) A vertical portion that is integrally provided on the base plate of the chassis and is bent at a substantially right angle to the base plate; (b) a bent portion having a substantially L-shaped cross section, which is formed of a horizontal portion that is bent and arranged approximately horizontally with respect to the substrate portion; (b) a bent portion that is integrally provided on both sides of the horizontal portion; at least two legs hanging down toward the base plate, (c) bent pieces integrally provided at the lower ends of the legs, and (d) at least two legs attached to the legs so as to correspond to the bent pieces. A portion of the base plate is sandwiched between the bent piece of the leg portion and the cut-and-raised piece, and the bent portion of the bent portion is 1. A chassis for electronic equipment, characterized in that the components are mounted on a horizontal portion so that the components are placed at a position spaced apart from the substrate portion.