JPH0731596Y2 - Printed circuit board storage case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a printed circuit board housing case, and more particularly to a structure of a guide rail for inserting and holding a printed circuit board.

[Prior Art] As shown in FIGS. 4 (a) and 4 (b), the conventional printed circuit board storage case has guide rails 12 on inner wall surfaces 10-1 and 10-2 facing each other of the housing 10, respectively. , 14 are provided, and a pressing portion 18 for pressing the printed circuit board 16 from above is projected from the central portion of the rear side wall 10-3 of the housing 10. The lower surface 18a of the pressing portion 18 has a guide rail 12,
It is provided slightly below the height of the traveling path lower surfaces 12a, 14a of the printed circuit board 14 and therefore, when the printed circuit board 16 is inserted along the guide rails 12, 14,
Due to the lower surface 18a of the pressing portion 18, the printed circuit board 16 warps downward in a convex manner, and is fixed and held by its own elastic force at this time.

5A and 5B show another conventional example. According to this conventional example, the front end portion of the lower wall 100-4 of the housing 100 and the correspondence after the printed circuit board 160 is inserted. Mounting holes 20 and 22 are formed in the portions, respectively, and a spacer 24 is interposed between the lower surface of the housing 100 and the printed circuit board 160 so that the printed circuit board 160 is provided.
The metal fitting 26 was disposed on the upper surface of the above, and the screw 28 was securely fixed from the lower side of the housing 100.

[Problems to be Solved by the Invention] Conventional Problems However, in the above-mentioned conventional example of FIGS. 4 (a) and 4 (b), the printed circuit board is generally paper impregnated with phenol, or Since glass fiber is impregnated with epoxy and is easily bent, but has a small elasticity, when it is fixed and held by the elastic force of the printed circuit board itself, it is loosened between itself and the guide rail due to aging. In addition, there is a problem in that the bending of the substrate causes stress in the soldered portion of the electronic component.

In the conventional example shown in FIGS. 5 (a) and 5 (b), the first
In addition, it is necessary to tighten screws to fix and hold the printed circuit board, which requires spacers and metal fittings, increasing the number of parts and increasing costs. Secondly, the spacer for receiving the tightening screw is required in a specific portion of the printed circuit board, so that electronic parts cannot be mounted in this portion and so-called dead space is generated. Thirdly, there is a problem in that a horizontal connector cannot be attached to the screw tightening portion due to the above space.

The purpose of the present invention is to solve the above-mentioned problems, and by providing a protrusion having a chevron cross section along a guide rail for inserting the printed circuit board, it is possible to reduce the cost and to prevent the printed circuit board from bending or rattling. It is an object of the present invention to provide a printed circuit board storage case that does not occur.

[Means and Actions for Solving Problems] In order to achieve the above object, the present invention provides a printed circuit board storage case in which printed circuit boards are inserted and held in guide rails respectively provided on inner wall surfaces of a housing that face each other. ,
The printed circuit board insertion path of the guide rail is partially provided with a ridge portion having a mountain-shaped cross section along the insertion direction.

Before the printed circuit board is inserted, the ridges have a mountain-shaped cross section of a series of linear lines, and the gap between the mountain-shaped top and the wall surface of the guide rail facing the mountain-shaped top is the same as that of the printed circuit board to be inserted. It is formed to be slightly smaller than the thickness. When the printed circuit board is inserted in this state, the chevron top is crushed by the insertion pressure at this time, and the printed circuit board is properly held between the ridge and the guide rail wall facing it along the direction orthogonal to the printed circuit board. It will be clamped and held by force. In addition, the substrate does not bend because it is a continuous line.

As described above, the printed circuit board can be reliably accommodated in the guide rail at a low cost without causing the printed circuit board to bend, play, or bend. Further, since the height of the ridge portion is gradually increased from the front surface of the housing toward the rear portion, the board can be easily inserted.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of a printed circuit board storage case according to the present invention. In the figure, guide rails 34, into which a plurality of printed circuit boards 32 are inserted and held, are provided on inner wall surfaces 30-1 and 30-2 of the housing 30 which face each other. The guide rails 34 are generally made of resin, and the housing 30 is made of a metal plate or resin. And the housing 30
When is made of a metal plate, the guide rail 34 is fixed by forming a mounting hole in its side wall, and when it is made of resin as in this embodiment, it is formed integrally with the housing 30.

What is characteristic of the present invention is that the printed circuit board insertion path of the guide rail 34 is partially provided with a protrusion having a chevron cross section along the insertion direction.

That is, in this embodiment, as shown in FIG. 2 (a), the board insertion path is the upper guide 34a of the guide rail 34.
And the lower guide 34b and the inner wall of the housing 30. The protrusions 36 are provided near the end of the lower guide 34b along the insertion direction of the printed circuit board 32. This ridge 3
6 is made of a resin such as polyacetal or polypropylene, and has a chevron cross section and has a plan view as shown in FIG. 2 (b). Then, the starting end portion thereof is formed in a sloping slope portion 36a along the insertion direction so that the printed circuit board 32 can be easily transferred. Top 3 of this ridge 36
The height of 6b can be constant along the longitudinal direction, or can be formed so as to gradually increase in the depth direction.

In this way, by gradually increasing the height of the top portion 36b, it is possible to facilitate the insertion of the printed circuit board 32 and more firmly hold the printed circuit board 32 when the insertion is completed.

In addition, it is preferable that the width of the bottom surface is wide at the portion where the height of the top is low, and the width of the bottom surface is narrow at the portion where the height of the top is low to stabilize the ridge portion 36.

The vertical gap H of the printed board insertion path is formed to be larger than the thickness t of the board 32, and the upper guide 34a
The gap t'between the lower surface of the printed circuit board and the upper portion of the protrusion 36 is equal to
Is formed to be slightly smaller than the thickness t.

In the embodiment of the present invention having the above construction, before inserting the printed circuit board, as shown in FIG. 3 (a), there is a gap t'between the lower surface of the upper guide 34a and the top 36b of the protrusion 36. However, when the printed circuit board 32 is inserted, as shown in FIG.
b is crushed, which causes the printed circuit board 32 to move to the upper guide 32a.
Thus, the ridge portion 36 and the ridge portion 36 are clamped and held with an appropriate elastic force.

As described above, according to the embodiment of the present invention, the printed circuit board is clamped and held in the vertical direction by the guide rails, so that the circuit board is not bent and therefore electronic components are mounted. No stress is generated in the soldered part, which is excellent in reliability, and does not cause problems such as poor contact. Further, since the guide rail is provided only with the ridge portion, the above effect can be achieved at low cost. Furthermore, since the elastic force of the printed circuit board itself is not used to fix the printed circuit board as in the conventional case, there is no fear that looseness will occur due to aging.

[Effects of the Invention] As described above, the present invention provides a printed circuit board insertion path of a guide rail with a protrusion having a chevron cross section along the insertion direction, so that the printed circuit board can be reliably stored and held at low cost. Therefore, the reliability can be improved. Further, since the height of the ridge portion is gradually increased from the front surface of the housing toward the rear portion, the board can be easily inserted.

[Brief description of drawings]

1 is a front view of a printed circuit board storage case according to the present invention, FIG. 2 (a) is an enlarged perspective view of a guide rail, FIG. 2 (b) is a plan view of a ridge portion, and FIG. 3 (a). , (B) are views showing states before and after insertion of the printed circuit board, respectively, FIG. 4 (a) is a front view of a conventional printed circuit board storage case, and FIG. 4 (b) is along its AA cross section. FIG. 5 (a) is a front view showing another conventional example, and FIG. 5 (b) is an exploded perspective view thereof. 30… Housing 32… Printed circuit board 34… Guide rail 36… Projection

Claims (2)

[Scope of utility model registration request] 1. A printed circuit board storage case in which a printed circuit board is inserted and held in guide rails respectively provided on opposing inner side walls of a housing, wherein the guide rails are two flat surfaces facing each other in a direction orthogonal to the printed circuit board. Part of the flat surface of the guide rail is provided along one side of the guide rail with a mountain-shaped cross section and is a series of linear ridges. Is provided in the vicinity of the front opening of the housing so as to gradually increase from the front of the housing toward the rear, and the top has a crushing margin that is crushed by the insertion pressure of the printed circuit board. A printed circuit board storage case, characterized in that the printed circuit board is pressed against the other flat surface portion of the guide rail by the ridges and held by being pinched. 2. A printed circuit board storage case according to claim 1 wherein the heights of the protrusions are the same except for the inclined portions.