JPS5911497Y2 - Mechanism to prevent incorrect insertion of printed circuit boards - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mechanism for preventing incorrect insertion when a printed circuit board is housed and mounted in a housing.

The plug-in printed circuit board mounting method involves inserting and sliding the printed circuit board into the guide rails provided on the top and bottom inside of the shelf housing, and then connecting the connector provided on the back of the shelf housing with the connector section of the printed circuit board. The common method is to connect the electrical circuits by fitting them together.

When there are a plurality of these plug-in type printed circuit boards, there are also a plurality of guide rails, and it is difficult to determine which guide rail the corresponding printed circuit board should be inserted into.

Therefore, the name, abbreviation, etc. of the printed circuit board to be mounted on or near the guide rail is displayed, or a color-coded mark is applied to prevent incorrect insertion of the printed circuit board.

However, even if there is an indication, if the printed circuit board is inserted and slid onto the guide rail at the wrong location and the printed circuit board is inserted and slid, the incorrect insertion may occur, resulting in damage to the electrical circuit.

Therefore, this display method is not perfect as a measure to prevent incorrect insertion of printed circuit boards.

An object of the present invention is to provide a mechanism for preventing incorrect insertion of a printed circuit board, which prevents the connector from fitting and connecting even if the printed circuit board is incorrectly inserted, thereby preventing electrical connection.

This will be explained below with reference to the drawings.

Figure 1 is a front view of the shelf housing.The housing 1 has a guide rail 2 on the inside upper surface for guiding the insertion of the printed circuit board, and a guide rail 2 on the lower surface side that is symmetrical to the upper surface. A plurality of guide rails 3 are provided respectively.

In FIG. 1, there are six guide rails 2 and 3 each.

Furthermore, a connector 4 for electrical connection to a printed circuit board is provided on the inner back surface of the casing 1.

Furthermore, L metal fittings 5 and L metal fittings 6 are fixed to the back surface with the left end side facing upward and the right end side facing downward, with an inclination downward to the right.

FIG. 2 is a sectional view taken along the line AA in FIG. 1.

The L bracket 5 is attached to the inner rear surface of the housing 1, and the tip 5a of the L bracket 5, which is on the opposite side of the mounting surface, is a dimension A from the connection insertion surface 4a of the connector 4, which is also provided on the rear surface of the housing 1. It's jumping out.

This is related to the connector connection portion of the printed circuit board, which will be described later.

FIG. 3 is an external view of the printed circuit board 10, which has a connector connection portion 10a, and has a notch 10b at a location facing the inner back surface of the housing 1 toward the insertion direction of the printed circuit board 10. .

The size of this notch 10b is such that the tip 5a of the L fitting 5 provided on the inner back surface of the housing 1 fits therein.

The position where this notch 10b is provided differs depending on each Pnont board.

FIG. 4A is a side view of various printed circuit boards, showing that the positions of the notches are different from 10 C and 10 d, respectively.

Further, dimension B shown in FIG. 4A is slightly smaller than dimension A, which is the dimension between the tip 5a of the L fitting 5 and the insertion connection surface 4a of the connector 4 described above.

In addition, although the L metal fitting 5 has been mainly explained, the earth metal fitting 6 also has the following:
It has the same structure as L fitting 5.

Also, in this explanation, there are two L fittings 5 and 6, but this is because the mounting position of the connector 4 is located in the center between the top and bottom, so it is not possible to install the connector 4 upward or downward. Once placed, the earthen metal fittings can be passed from left to right at an angle and fixed in place.

An example of inserting and mounting a printed circuit board into a casing constructed in this way will be described with reference to FIGS. 1 and 4, A, and FIG. 5, A and B.

FIG. 5A is a side view of the mounted state in which the printed circuit board shown in FIG. 4A is inserted into the guide rail portion 1 in FIG. 1 and the connector connection is completed.

At this time, the tip end 5a of the L fitting matches the notch provided in the printed circuit board.

If the printed circuit board at the opening in Figure 4 is inserted into the guide rail section 1 in Figure 1 by mistake, the notch 10d provided on the printed circuit board will not match the tip 5a of the L metal plate provided on the housing. Therefore, as shown by the opening in FIG. 5, the tip 5a of the L metal stops the printed circuit board just before the connector connecting portion of the printed circuit board is inserted into the connector.

By fixing the L fitting to the inner back surface of the casing with an inclination in this manner, the position of the tip portion 5a is different with respect to each guide rail due to the inclination.

Therefore, the printed circuit board that is inserted and mounted on each guide rail requires a unique notch that matches each guide rail.
This is a printed circuit board dedicated to each guide tray.

As described above, by using the mechanism of the present invention, even if a printed circuit board is inserted incorrectly, the tip of the L metal plate and the notch do not match, so it cannot be inserted any further, so no electrical connection is made, and the electrical connection of the printed circuit board is prevented. It is also effective in preventing circuit damage.

[Brief explanation of the drawing]

Fig. 1 is a front view of a shelf board housing to which L fittings according to the present invention are fixed, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a printed circuit board with a cutout according to the present invention. External view, Figure 4 (a) is a plan view of the printed circuit board showing the different states of the notches unique to each printed board, and Figure 5 (a) is a cross section showing the state in which the casing and printed circuit board are installed in the proper state. Figures 5 and 5 are cross-sectional views showing a state in which mounting is impossible when a printed circuit board is inserted by mistake. In the figure, 1 is a housing, 2 and 3 are guide rails, 4 is a connector, 5 and 6 are L fittings, 10 is a printed circuit board, 10
a is the connector connection part, 10 b , 10 C , 10
d is a notch.

Claims (1)

[Scope of utility model registration request] An L-bracket is fixed at an angle to the inner back surface of a shelf housing in which a plurality of printed circuit boards are mounted, and a notch is provided at a location facing the inner back surface of the housing in the direction in which the printed circuit boards are inserted. A mechanism for preventing erroneous insertion of a printed circuit board, characterized in that erroneous insertion of the printed circuit board is prevented by a fitted state between a notch of the circuit board and the tip of the L metal part.