JPH0534148Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Summary] This invention is a combination of protrusions that are attached to the front plate of units with the same width but different functions when inserting printed wiring board units (hereinafter abbreviated as units) into storage casings. This prevents incorrect insertion of the unit.

[Industrial Application Field] The present invention relates to an improvement in a structure for preventing incorrect insertion of a unit into a storage case.

Inadvertent insertion of a unit can cause serious problems such as destruction or burnout of the unit or malfunction of the equipment, and there is a strong need for an inexpensive and simple preventive measure that can detect errors before they occur and prevent incorrect insertion. .

[Conventional technology]

Conventionally, as shown in the perspective view of FIG. 2, in order to prevent incorrect insertion of the unit 1, which has front plates 2' of the same width and different functions, several types of grooves 1b are combined in a printed wiring board 1a to form a back board. 7, or by a combination of the blind pin hole 8a and pin 9a of the male and female connectors 8 and 9 to be connected, or by making the mounting position of the connector vertically asymmetrical, or by making the mounting position of the connector asymmetrical in the vertical direction. Erroneous insertion is prevented by comparing the displayed characters A and B of 2' with the displayed characters A and B at the insertion position.

[Problem that the invention attempts to solve]

However, according to the above structure,
The identification point for incorrect insertion is located in the back of the storage case and cannot be seen directly, so it is difficult to identify whether it is incorrect insertion or not, so it is difficult to identify, and it may be damaged if it is forcibly inserted without noticing. .

Another problem was that the provision of several types of grooves on printed wiring boards and the modification of connector pins and attachment methods made it difficult to standardize printed wiring boards and units.

The present invention provides a structure for preventing incorrect insertion of a printed wiring board unit in order to solve the above-mentioned problems.

[Means for solving problems]

The above-mentioned problem with the conventional structure is that the width of the front plate of the printed wiring board unit is taken as a unit width, and the front plates whose width is twice, three times, ... an integer multiple of the unit width are arranged in parallel and the mounting holes are equidistantly spaced. On the other hand, the mounting frame of the storage case to which the printed wiring board unit is attached is provided with equally spaced insertion holes and mounting screw holes corresponding to the mounting holes, and at least one protrusion is assembled and mounted in the mounting hole. However, by inserting a dummy screw into the insertion hole/mounting screw hole that does not correspond to the projection, it is possible to mount the units in combination even if they have the same front panel width but different functions. If the protrusion does not match the insertion hole of the mounting frame of the storage case, it cannot be inserted, so it can be identified as incorrect insertion.

〔Example〕

The gist of the present invention will be specifically explained below with reference to an embodiment shown in the drawings.

As shown in the front view of Figure 1, the front plate 2 of No. 1
-1, four mounting holes 2a are provided at predetermined positions, and four mounting screw holes 2b corresponding to the mounting holes 2a are provided in the mounting frame 6 of the storage case to which the unit is mounted.

The left side of the front plate 2-1 of No. 1, one upper and lower mounting hole 2a are for the mounting screw 5, and the other two mounting holes 2
A also serves as a hole for attaching a protrusion to prevent incorrect insertion, for example, a guide pin 3, and the guide pin 3 is attached to the upper or lower side, and the mounting screw hole 2b of the mounting frame 6 corresponding to this guide pin 3 is a guide pin. It also serves as an insertion hole into which the tip of No. 3 is inserted.

A dummy screw 4 is screwed into the mounting screw hole 2b of the mounting frame 6 that does not correspond to the guide pin 3, and the dummy screw 4 is placed so that the incorrect guide pin 3 will not be inserted.

In the case of the unit with the front plate 2-1 of No. 1 explained above, it is possible to prevent incorrect insertion of the unit having two types of functions A' and B', but if the number of guide pins 3 is further increased, the Needless to say, the number of combinations of guide pins 3 increases, and it is possible to prevent incorrect insertion of units having a wide variety of different functions.

In addition, the width of the front plate 2-1 of No. 1 is the unit width,
Width is 2 times, 3 times, ... an integer multiple of this unit width 2
Attach the front plates 2-2, 2-3, etc. of No., No. 3, ... to various units, and attach these front plates 2-1, 2.
-2, 2-3, ... are arranged in parallel, the intervals in the parallel direction of the mounting holes 2a of the front plate 2-1 of No. 1 in the above explanation are set to be equal intervals, and the corresponding equally spaced mounting holes 2a are set. By providing the mounting screw holes 2b in the mounting frame 6 of the storage case, the front plates 2-1, 2-2, 2-
3,... and the mounting frame 6 can be standardized as individual standard parts.

[Effect of idea]

As described above, according to the present invention, incorrect insertion can be easily determined from the front position where it can be seen directly, so there is no damage to the unit.Furthermore, the front plate can be standardized, and the material of the back board and unit can be Since it is possible to standardize printed wiring boards and connectors, it has extremely useful practical effects such as lower manufacturing costs.

[Brief explanation of the drawing]

Figure 1 is a front view of one embodiment of the present invention;
The figure is a perspective view according to the prior art. In the figure, 2 is the front plate, 2a is the mounting hole, 2b
3 indicates a mounting screw hole/insertion hole, 3 indicates a guide pin, 4 indicates a dummy screw, 5 indicates a mounting screw, and 6 indicates a mounting frame.

Claims (1)

[Scope of utility model registration request] The width of the front plate 2-1 of the printed wiring board unit is taken as a unit width, and the front plates 2-2, 2-3, etc. whose width is twice, three times, ... an integral multiple of the unit width are arranged in parallel at equal intervals. At least one mounting hole 2a is provided in the mounting hole 2a of the mounting hole 2a, and on the other hand, the mounting frame 6 of the storage case to which the printed wiring board unit is mounted is provided with equally spaced insertion holes and mounting screw holes 2b corresponding to the mounting hole 2a. A structure for preventing incorrect insertion of a printed wiring board unit, characterized in that one protrusion 3 is attached in combination, and a dummy screw 4 is screwed into the insertion hole/attachment screw hole 2b that does not correspond to the protrusion 3.