JPH01198098A - Mechanism for preventing erroneous insertion of printed board unit - Google Patents

Abstract

PURPOSE:To mechanically prevent erroneous insertion of a printed board unit, by providing a surface plate attached to the printed board unit with a projection particular thereto while providing a shelf with a notch corresponding to the projection. CONSTITUTION:Pieces projected from the upper and lower ends of a surface plate 7 to be attached to a printed board unit 2 are folded in U-shape to define U-shaped folded sections 71 having a predetermined height as measured from the upper and lower edge of the plate. Attaching pieces 73 are provided at tip ends of these U-shaped folded sections 71 so that the surface plate 7 is attached to the printed board unit 7 by means of them. Further, a projection 72 is provided on the upper or lower edge of the folded sections 71 opposing to a shelf 1. Position of the projection 72 is different for each unit. A notch 11 somewhat wider than the projection 72 is provided at the position corresponding to the projection 72 and the printed board unit 2 is inserted in the direction as indicated by the arrow along a guide groove 12 so that it is packaged in the shelf 1. Projections 72 of surface plates 7 of various printed board units 2 and notches 11 of the shelf 1 can be sized particularly for the respective printed board units, so that erroneous insertion of the units can be prevented reliably.

Description

[Detailed Description of the Invention] [Summary] Regarding a mechanism to prevent incorrect insertion of various types of printed circuit board units that are inserted and mounted in a shelf, a unique protrusion is provided on the surface plate attached to the printed board unit, and the shelf corresponds to the protrusion. The purpose is to mechanically prevent incorrect insertion by providing a notch to prevent incorrect insertion, and the top and bottom of the surface plate attached to the pudding unit have U-shaped folded parts at a predetermined height from the top and bottom ends. A mounting piece for the printed board unit is provided at the tip of the folded portion, and cutouts that pair with the insertion guide grooves of each printed board unit are formed at the front edge of the shelf into which the printed board unit is inserted, with different dimensions. In addition, protrusions corresponding to the notches of the shelf are provided on the edge of the folded portion facing the shelf.

[Industrial application field]

The present invention relates to a mechanism for preventing incorrect insertion of various types of printed board units that are inserted and mounted in a shelf.

Electronic devices are mounted by inserting various types of temporary print units with different circuit configurations along guide grooves provided on the shelf. However, since the printed board units inserted and mounted on the same shelf have the same shape and dimensions, the printed board units may be inserted at the wrong insertion position. Incorrect insertion and mounting as described above may cause electrical damage or malfunction.

[Conventional technology]

Figure 4 is a diagram illustrating a conventional mechanism for preventing incorrect insertion of a printed board unit. It is a diagram.

In FIG. 4(a), a protrusion 51 with a predetermined width B and a height H (H is slightly larger than the length of the pin of the connector 3) is formed on the side of the printed board unit 2 on which the connector 3 is attached. At the same time, a protrusion 51 is attached to the backboard 4 of the shelf 1 at a position corresponding to the protrusion 51 formed on the printed board side block 5.
A backboard side block 6 having a recess 61 having a slightly wider width B'(B'>B) is attached at a relative position.

Then, when the printed board unit 2 is inserted into the shelf 1 in the direction of the arrow, the protrusion 51 formed on the printed board side block 5 is inserted into the recess 61 of the backboard side block 6.
The connector 3 of the printed board unit 2 is connected to the connector 3' of the backboard 4, and the printed board unit 2 is operated.

In FIG. 4 fb), a backboard side block 6 is attached corresponding to another printed board unit 2 of the backboard 4, in which a recess 61 that does not correspond to the projection 51 is formed as shown in the figure.

In this way, even if the printed board unit 2 is inserted into the shelf 1 from the direction of the arrow, the protrusion 51 does not match the recess 61 of the backboard side block 6, so the connectors 3 and 3' are not connected and incorrect insertion can occur. Prevented.

[Problem to be solved by the invention]

In the above-mentioned conventional mechanism for preventing incorrect insertion of a printed board unit, the blocks to be attached to the printed board and the blocks to be attached to the backboard are individually positioned, which requires a large amount of man-hours for assembly. Since the block is attached to the mounting surface, there is a problem in that the mounting space for the components is reduced.

[Means to solve the problem]

The present invention solves the above problems and provides a mechanism for preventing incorrect insertion of a printed board unit, which is a simple mechanism and has a good space factor.

That is, on the upper and lower sides of the surface plate attached to the printed board unit, a U-shaped folded part is provided at a predetermined height from the upper and lower ends, and a mounting piece to the printed board unit is provided at the tip of the folded part. At the front edge of the shelf into which the printed board units are inserted, notches are formed to pair with the insertion guide grooves of each printed board unit, and have different dimensional relationships,
This problem is solved by providing protrusions corresponding to the notches of the shelf on the edge of the folded portion facing the shelf.

[For production]

With this mechanism for preventing incorrect insertion of a printed board unit, if a printed board unit of the same shape but with a different circuit is inserted, the protrusion and the notch will not match, and therefore the printed board unit cannot be inserted.

〔Example〕

Figures 1 to 3 are diagrams for explaining one embodiment of the present invention. Figure 1 is an external perspective view, Figure 2 is a perspective view of the main part where the protrusion and notch match, and Figure 3 is the protrusion. This is a perspective view of a main part where the notches do not match, and the same reference numerals are given to the same parts as in FIG. 4.

FIG. 1 shows U-shaped folded parts 7 at a predetermined height from the upper and lower ends on the upper and lower sides of the surface plate 7 attached to the printed board unit 2.
1, a mounting piece 73 for attaching to the printed board unit 2 is provided at the tip of the folded part 71, and protrusions 72 are formed at different positions on the upper edge or lower edge of the folded part 71 facing the shelf 1. .

Then, the printed board unit 2 with the surface plate 7 fixed thereto is inserted and mounted on the front bent part of the shelf 1 (the surface that the surface plate 7 comes into contact with) at a position corresponding to the protrusion 72 provided on the surface plate 7. A notch 11 having a width slightly wider than the width of the protrusion 72 is provided, and the printed board unit 2 is inserted into the guide groove 1.
2, insert and mount in the direction of the arrow.

FIG. 2 shows the surface Fi explained in FIG. 1, specific to the U-shaped folded portion 71 (the depth W is formed slightly larger than the length of the pin of the connector) (determined individually by the printed board unit). Protrusion 72 of dimension (A) and shelf 1
The position of the notch II, which has a width (D') slightly larger than the width (D) of the projection 72, coincides with the position corresponding to the projection 72 on the front edge (the surface in contact with the surface plate 7). There is.

Therefore, when the printed board unit 2 is inserted from the direction of the arrow along the guide groove 12 provided in the shelf 1, the protrusion 72 of the top plate 7 is inserted into the notch 11 of the shelf 1, and the connector (not shown) is inserted into the connector of the bank board. Connected.

Printed board unit 2 with surface plate 7 provided with 72
When another printed board unit 2 with a notch 11 (B) formed on the front edge of the shelf 1 is inserted into the part where it should be inserted, the notch 11 and the protrusion 72 do not align as shown in the figure. , the protrusion 72 comes into contact with the front bent portion of the shelf 1 and is not inserted by the depth W of the U-shaped bent portion 71, so that the connector (not shown) is not connected.

Therefore, the connector (not shown) attached to the printed board unit 2 is not connected to the connector of the bank board.

In this way, the protrusions 7 on the surface plate 7 of the printed board unit 1
Since the notch 2 and the notch 11 of the shelf l are formed to have specific dimensions, it is possible to reliably prevent incorrect insertion.

In this embodiment, the surface plate 7 provided with the notch 11 and the protrusion 72 is attached to the upper edge of the printed board unit 2. However, in order to prevent incorrect insertion of various types of printed board units 2, They may be provided not only on the upper edge but also on the lower edge of the surface plate 7, or on both the upper and lower edges.

〔Effect of the invention〕

As is clear from the above explanation, according to the present invention, there is no need for assembly work or parts to prevent incorrect insertion, so work efficiency and component mounting space factor are improved, and there is an advantage that incorrect insertion can be confirmed from the front. be.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams for explaining one embodiment of the present invention. Figure 1 is an external perspective view, Figure 2 is a perspective view of the main part where the protrusion and notch match, and Figure 3 is the protrusion. Fig. 4 is a perspective view of the main part where the notches do not match, and Fig. 4 explains the mechanism for preventing incorrect insertion of a conventional printed board unit. ) is an exploded side sectional view when the blocks do not match. In the figure, 1 is a shelf, 2 is a printed board unit,
3, 3' are connectors, 4 is a backboard, 5 is a printed board side block, 6 is a backboard side block, 7 is a surface plate, 11 is a notch, 12 is a guide groove, 51 is a protrusion, 6
1 is a concave portion, 71 is a U-shaped folded portion, 72 is a protrusion, 7
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Claims (1)

[Claims] U-shaped folded portions (7) at a predetermined height from the upper and lower ends are provided on the upper and lower sides of the surface plate (7) attached to the printed board unit (2).
1), a mounting piece (73) for attaching to the printed board unit (2) is provided at the tip of the folded part (71), and a mounting piece (73) for attaching to the printed board unit (2) is provided at the front edge of the shelf (1) into which the printed board unit (2) is inserted. The notch (11) that pairs with the insertion guide groove (12) of the printed board unit (2) is formed with a mutually different dimension relationship, and the shelf (1) is formed on the edge of the folded portion (71) opposite to the shelf (1). A mechanism for preventing incorrect insertion of a printed board unit, characterized in that projections (72) corresponding to the notches (11) of (1) are provided.