JPS61214595A - Construction of box body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a structure of a box in which screws are not used for attaching a front panel.

[Prior art]

For example, a case for electrical equipment is constructed by attaching a front panel to the front of a chassis that forms the back plate and bottom plate, and covering it with a cover that forms the top and both sides, and houses the required number of printed wiring boards inside. be done.

However, in the past, screws were used to attach the front panel, which required work to secure the front panel to the chassis.

[Purpose of the invention]

An object of the present invention is to provide a case structure in which a front panel can be securely fixed only by engagement without using screws.

[Structure of the invention]

For this purpose, the structure of the box of the present invention is such that a cover engaging part is provided at the upper part of the back end of the front panel, a chassis engaging part is provided at the lower part of the front end, and the cover engaging part is provided with the cover engaging part at the lower part of the front end. The front end of the chassis is configured by engaging the front end of the chassis with the chassis engaging portion.

〔Example〕

Examples of the present invention will be described below. Figure 1 is a sectional view showing the structure of the box, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a perspective view showing the relationship between the chassis and the front panel, and Figure 4. FIG. 2 is a perspective view showing the relationship between the back of the chassis and the printed wiring board.

A is a chassis, B is a front panel, C is a cover, and D is a printed wiring board. First, the chassis A is composed of a back plate part 1 and a bottom plate part 2. A predetermined number of guide parts 3 for guiding the rear end of the printed wiring board are formed on the back plate part 1 by cutting and bending. A board holding piece 5 having a claw 5a that engages with a hole 4 formed in the printed wiring board
is formed by cutting and bending (FIG. 3), and a truncated conical support portion 6 is further formed by rolling. In addition, a bent piece 7 is formed at the tip of the bottom plate portion 2 to the chassis, and a part thereof has a notch 8 for attaching the front panel B and an opening 9 corresponding to the notch 8, which is arranged in the lateral direction. Multiple sets have been formed. 10 is a side piece.

On the other hand, the front panel B has a plurality of cover engaging pieces 12 formed in the upper part thereof in the lateral direction, which constitute a cover engaging part for receiving the bent piece 11 at the front end of the cover C. This cover engagement piece 12 is formed with a notch facing upward. Further, in the lower part of the front panel B, a plurality of board holding pieces 13 for receiving the tips of the printed wiring boards are formed laterally, and further below the position where the board holding pieces 13 are lined up, elastic claws 14 are formed. A plurality of sets are formed in the horizontal direction corresponding to the notches 8 of the chassis A. 15 is a pressing piece, and 16 is a lip formed at an inner corner portion. The set of the elastic claw 14 and the pressing piece 15 constitutes a chassis engaging portion.

Predetermined circuit wiring and electronic components are mounted on the printed wiring board, and a transformer E is soldered to a predetermined position.

The cover C is a top cover 16 that forms the top and both sides of the box.
and a side part 17.

Now, in this embodiment, first, the bent piece 7 of the chassis A is
Assemble front panel B on the side. For this purpose, chassis A
When the elastic pawl 15 of the front panel B is engaged from above the opening 9, the pressing piece 15 is positioned below the opening 9, so that the chassis A is eventually held between the elastic pawl 15 and the pressing piece 15. Become.

Then, when the elastic claw 14 engages with the opening 9, pulling out is restricted.

Next, attach the rear end of the printed wiring board to the back plate part 1 of chassis A.
At the same time, the hole 4 is engaged with the claw 5a of the board holding piece 5 of the chassis A, and the tip of the printed wiring board is engaged with the board holding piece 13 of the front panel B. let This allows the printed wiring board to be installed in the correct position.

Then, the flange portion 18 of the transformer E is collinearly aligned with the chassis A from the printed wiring board using screws F. Since the transformer E is relatively heavy, it is collinear with the truncated conical support section 6 of the chassis A. As a result, the printed wiring board supports the transformer E at the portion directly resting on the chassis A, so that no bending occurs.

Next, insert the cover C so that the bent piece 11 at the front end fits into the cover engagement piece 12 of the front panel B, and the bent piece 19 at the rear end fits into the upper end of the back plate part 1 of the chassis A. , and fix both sides to chassis A with screws G.

As described above, since the front panel B is attached to the chassis A and the cover C while being fitted therein, there is no need for any screws there. Also, since the printed wiring board will be sandwiched between the back plate l of chassis A and the front panel B in the direction along the surface, it is not necessary to fix it with screws, but it is necessary to do so. Even in this case, by tightening the screw F for mounting the transformer E, the lines will be collinear.

〔Effect of the invention〕

As described above, according to the structure of the box of the present invention, the front panel is attached to the chassis while being engaged with the cover, so there is no need to use screws there, and assembly and disassembly are facilitated. It has a unique characteristic.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of the box of the present invention, Fig. 2 is a sectional view taken along line nn in Fig. 1, and Fig. 3 is a sectional view of a part of the front end of the chassis and a corner part of the front panel. A partial perspective view showing the relationship;
FIG. 4 is a partial perspective view showing the relationship between the back plate portion and bottom plate portion of the chassis and the printed wiring board. A...Chassis, B...Front panel, C...Cover, D...Printed wiring board, E...Transformer, F%
G...screw.

Claims (3)

[Claims] (1) In the structure of the box, the lower surface is formed by a chassis, the upper surface and both side surfaces are formed by a cover, and the front surface is formed by a front panel, in which a cover engaging part is provided at the upper part of the back end of the front panel, and The structure of the box includes a chassis engaging portion provided at a lower portion of the back end, a front end of the cover engaging the cover engaging portion, and a front end of the chassis engaging the chassis engaging portion. (2) The box according to claim 1, wherein the cover engaging portion has a notch facing upward, and the bent piece at the front end of the cover engages with the notch. structure. (3) The chassis engaging portion includes an elastic claw and a pressing piece, the elastic claw engages an opening formed in the front end of the chassis from one side, and the pressing piece presses the vicinity of the opening from the other side. The structure of the box according to claim 1, wherein the structure is as follows.