JPS608472Y2 - Device to prevent incorrect insertion of printed wiring boards - Google Patents

Description

[Detailed description of the invention] When a printed wiring board is formed of, for example, one mother port and a plurality of daughter ports and these are connected with a detachable connector, a terminal is formed with printed wiring on one edge of the daughter ports. In this case, erroneous insertion of other daughter ports can be prevented by, for example, providing a cut groove on the edge and forming a protruding piece on the connector of the motherboard that fits into the groove.

However, if the connector has a large number of terminals, a connector consisting of a plug and a jack is required to increase the reliability of contact, so incorrect insertion cannot be easily prevented as described above.

Therefore, the present invention provides a device that can prevent erroneous insertion of daughter ports, etc., especially in such cases.

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a front view of the printed wiring board in Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. FIG. 5 is an enlarged cross-sectional view taken along line BB in FIG. 2.

That is, a printed circuit board motherboard 2 is attached to a base 1, and a plurality of rectangular daughter ports 3, 3 are attached at right angles to the motherboard 2, which is a printed wiring board.
・・・・・・ is the installation.

The daughter ports 3, 3... have both sides fitted into the guide grooves 4, 4... of the base, as shown by arrows X in Figure 1. Then, the connector 5 of the motherboard 2 and the connector 6 of the daughter port are fitted together.

That is, the connectors 5 and 6 are provided to face the mounting base 1 and the bottom of the daughter port 3, respectively, but when the center point of the daughter port 3 is p,
The connectors 5 and 6 are arranged asymmetrically, as shown in FIGS. 1 and 2, with respect to a straight line passing through the center point p and parallel to both sides.

A pin is planted near the position where a straight line q passing through the point p intersects both sides of the port to form protrusions 7, 7, and the port is attached to the side of the guide groove 4 in the base 1. 3
A stepped portion 8.8 is provided which engages with the protrusions 7, 7 when the daughter port is inserted to a predetermined position, and the position of the straight line q is made different for each daughter port.

Figures 6 and 7 explain the operation of the present invention.
The board 3, which has protrusions at points a and b on the straight line q as shown by points a and b in the figure, connects to the motherboard 2 with the connectors 5 and 6 properly mated as shown in FIG. Connected.

However, as shown in Fig. 7, a point Ct on a different straight line r
When the board 3 provided with the protrusion 7 at d is inserted into the guide groove 4 as shown by the solid line in FIG. 6, the connector 5,
6 is fitted, a protrusion 7 at the bottom of the figure engages with the step 8 to prevent insertion of the board.

Also, like the straight line S in Fig. 7, there are protrusions 7 at points e and f on a straight line that is inclined in the opposite direction to the straight line r with respect to the straight line q.
In the case of the board provided with this, the protrusion at the upper part of the figure engages with the stepped portion 8, as shown by the chain line in FIG. 6, and the fitting of the connectors 5 and 6 is similarly prevented.

Furthermore, assuming that the above straight lines q and r are inclined in opposite directions by the same angle, if the connectors 5 and 6 are arranged symmetrically with respect to a straight line that passes through point p and is parallel to both sides, then , when a board having protrusions at points c and d on straight line r is turned over and inserted into the position of a board having protrusions at points a and b on straight line q, the connectors will fit together and erroneous insertion will occur.

However, since the device of the present invention has the connectors arranged asymmetrically, the positions of the connectors 5 and 6 will be different when the connectors are inserted inside out as described above, and their mating will be prevented.

In this way, the device of the present invention can detect the center point p of the rectangular printed wiring board.
A pair of protrusions are formed at the portions where a straight line passing through the guide groove intersects both sides, and a stepped portion is provided on the side of the guide groove so as to face the protrusions, and the connectors are arranged asymmetrically.

Therefore, by making the position of the straight line different for each wiring board, it is possible to reliably prevent incorrect insertion and eliminate the risk of burnout, and also to form protrusions by planting pins on the printed wiring board. Therefore, a large number of holes can be provided in advance on both sides of the wiring board, and after the wiring is completed, pins can be implanted in desired holes depending on the content of the wiring.

Therefore, not only is the structure simple and easy to manufacture, but also the production efficiency of wiring boards is improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a front view of the printed wiring board in Fig. 1, Fig. 3 is a sectional view taken along line A-A in Fig. FIG. 5 is an enlarged cross-sectional view taken along line BB in FIG. 2, and FIGS. 6 and 7 are diagrams for explaining the operation of the present invention. In the figure, 1 is a base, 2 is a motherboard, 3 is a daughter board, 4 is a guide groove, 5 and 6 are connectors, 7 is a projection, and 8 is a stepped portion.

Claims (1)

[Scope of utility model registration request] Protrusions are formed by planting pins on each side of a rectangular printed wiring board on a straight line passing through the center point of the printed wiring board, and the both sides of the printed wiring board are fitted together. a step portion that engages with the protrusion to prevent insertion of the printed wiring board is formed on the side of the guide groove in the mounting base that holds the printed wiring board; A device for preventing incorrect insertion of a printed wiring board, in which a connector provided at a portion facing the bottom side is arranged asymmetrically with respect to a straight line passing through the center point and parallel to both sides.