JPH02943Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a mechanism for preventing incorrect insertion of a printed wiring board when a printed wiring board carrying a plurality of electronic components mounted on an electronic device is inserted into a basket.

A conventional printed wiring board erroneous insertion prevention mechanism is shown in FIG. That is, a female connector 2 is mounted on a printed wiring board (hereinafter referred to as a printed board) 1 on which electronic components are mounted, and a key plug 3 can be freely inserted into the female connector. The female connectors include male connectors 4a, 4b, 4c, 4d... (as an example, 24
The basket 6 can be removably inserted into the basket 6 by means of its protruding connector pin 5.
is equipped with the male connector so that a plurality of printed circuit boards 1 can be stored therein.

Therefore, it is necessary to insert the printed board 1 into the determined male connector 4a via the female connector 2, but the adjacent male connectors 4b, 4 may be mistakenly inserted.
There is a possibility that it can be inserted into either C or 4D.

To prevent this incorrect insertion, first insert the key plug 3 into a predetermined position of the female connector 2, and at the same time cut the connector pin 5 protruding from the male connector 4a corresponding to the plug position. By doing so, the female connector can be inserted into the male connector, while the female connector cannot be inserted into other male connectors, so that incorrect insertion can be avoided.

However, in recent years, as electronic components mounted on printed circuit boards have become more dense, connectors have also become more dense.
As a result, when inserting a printed circuit board into a connector installed in a card basket, a greater insertion force is required than before, and insertion jigs have become necessary. There is. If this insertion jig is used, the key plug in the conventional erroneous insertion prevention mechanism described above will destroy the connector pin, resulting in insertion being carried out, and the conventional prevention mechanism will no longer be able to fulfill its role. ing.

This invention was devised in view of these points, and the purpose is to provide a mechanism for preventing incorrect insertion of printed wiring boards that can reliably and easily prevent incorrect insertion, regardless of the density of the connector. It is something to do.

In the present invention, a flange is provided in the basket opening along the direction in which the printed wiring boards are arranged, and a front plate having a portion facing the flange is provided on the side that becomes the front side when the printed wiring boards are inserted. , a regular polygonal hole is bored in the opposing part, a tapered part is provided at the tip, a root base having a shape corresponding to the regular polygonal hole is provided at the other end, and a protruding part is provided in the central part in the axial direction on the outer periphery. An incorrect insertion prevention pin having a protruding columnar portion is fixed to the regular polygonal hole such that the position of the protrusion in the circumferential direction is different for each printed wiring board, and each printed wiring on the basket flange is fixed to the regular polygonal hole. When the board is inserted into a predetermined position, a mis-insertion prevention pin engaging hole is drilled at a position corresponding to each of the mis-insertion prevention pins, into which only the columnar part of the prevention pin whose protrusion is oriented in a specific circumferential direction can be fitted. By establishing this system, the above objectives have been achieved.

Next, an explanation will be given with reference to drawings showing an embodiment of this invention. In Figs. 2, 3 and 4, a regular polygonal prevention pin mounting hole 8 is bored in the front plate 7 of the printed board 1. , the mounting hole has a third
A mounting female threaded hole 1 having the same shape as the mounting hole of the incorrect insertion prevention pin 9 shown in the figure, into which a freely insertable root base 12 is fitted and screwed into the center of the root base.
A male fixing screw 14 is screwed into the pin 3 so that it can be fixed freely.Therefore, when attaching the prevention pin to the front plate 7, there are as many attachment methods as there are sides of the regular polygon, as shown in FIG. Square root base 12
In this case, it can be installed by rotating it in four ways. Further, the prevention pin has a round bar portion 17 having a tapered tip and forming a tapered portion 11 at the root base.
are concentrically protruding, and a protrusion 10 is protruded from the outer periphery of the round bar in the axial direction. Projections 1 with the same number of sides as part 12
There is a protrusion direction of 0. On the other hand, male connectors 4a, 4b, 4 are attached to the front flange of the basket 6.
Incorrect insertion prevention pin engagement holes 15a, 15b, 15c, and 15d are formed at positions corresponding to connectors c and 4d (four connectors are provided in FIGS. 2 and 4), respectively. Prevention pin protrusion 1
A round bar portion 17 with a protruding number 0 is formed to be able to be inserted freely, and at this time, a notch portion 16 attached to the engagement hole is formed.
The protrusion is inserted into the holder. Also,
In FIG. 4, the engagement hole 15a is upward, the engagement hole 15b is downward, the engagement hole 15c is to the left, and the engagement hole 15d is to the right. Although the base 12 is oriented in four different directions, it is oriented in the same number of directions as the number of sides of the regular polygon of the root base 12.

Therefore, according to the configuration of this invention, although the printed board 1 must be inserted into the specified male connector 4a, it is possible to accidentally insert the printed board 1 into the adjacent male connector 4a.
b, 4c, or 4d, and to prevent this, the front plate 7 of the printed board is
Insert the incorrect insertion prevention pin 9 into the prevention pin mounting hole 8 of the front plate by inserting its base 12 into the protrusion 1 of the prevention pin.
0 is inserted so that it is oriented upward, and then fixed with the fixing male screw 14, the prevention pin engagement hole 15 drilled in the front surface of the basket 6 is inserted.
Notch part 1 among a, 15b, 15c, 15d
Since the prevention pin 9 can be inserted only into the engagement hole 15a in which the pin 6 faces upward, the female connector 2 of the printed board 1 can be inserted only into the male connector 4a, while the other Since the orientation directions of the cutout portions of the matching holes are different from each other, insertion cannot be performed, and erroneous insertion can be prevented. Note that the tapered portion 11 at the tip of the prevention pin 9 corrects the misalignment between the prevention pin and the engagement hole 15a to facilitate smooth insertion. 8 and the root base 12 are rectangular in shape, but by forming them into hexagonal or even polygonal shapes, the prevention pin 9 can be attached in a variety of ways, and the prevention pins 9 can be attached in two or more locations to allow even more types of attachment methods. Furthermore, by press-fitting the base into the mounting hole, the fixing screw 14 becomes unnecessary, and the mounting is simplified.

As mentioned above, this invention can prevent incorrect insertion of the board, and since the mating part of the prevention mechanism is provided on the front, it is easy to operate because the correct position can be confirmed while being inserted visually. In addition, the number of parts is small and installation is simple, and therefore the cost is low and a durable product can be obtained, which has great practical benefits.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional printed wiring board prevention mechanism, FIG. 2 is a perspective view of an embodiment of this invention, and FIG. 3 is a perspective view of a conventional printed wiring board prevention mechanism. FIG. 4, an enlarged perspective view of the prevention pin, is an explanatory diagram similarly showing the prevention pin engagement hole and the male connector from the front. 1... Printed board, 6... Basket, 9...
Misinsertion prevention pin, 10... protrusion, 11... taper part, 12... root base, 15a, 15b, 15
c, 15d...Preventing pin engagement hole, 16...Notch portion, 17...Round bar portion. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claim for Utility Model Registration] Prevention of incorrect insertion of printed wiring boards to prevent printed wiring boards from being inserted into incorrect positions when multiple printed wiring boards are inserted and stored at predetermined positions in a basket. In the mechanism, a flange is provided in the basket opening along the direction in which the printed wiring boards are arranged, and a front plate is provided on the side that becomes the front side when the printed wiring board is inserted, and has a portion facing the flange. A regular polygonal hole is bored in the opposing part, a tapered part is provided at the tip, a root base with a shape corresponding to the regular polygonal hole is provided at the other end, and a protrusion is provided in the central part in the axial direction on the outer periphery. An incorrect insertion prevention pin having a protruding columnar part is fixed to the regular polygonal hole such that the circumferential position of the protruding part is different for each printed wiring board, and Erroneous insertion prevention pin engagement in which only the columnar portions of the prevention pins with protrusions facing in a specific circumferential direction can be fitted into positions corresponding to the respective erroneous insertion prevention pins when each printed wiring board is inserted into a predetermined position. A printed wiring board misinsertion prevention mechanism characterized by having a hole.