JPH11274764A - Fixing structure of printed board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fixing structure of a prinded board which improves workability and can shorten working time. SOLUTION: A cabinet 1 is constituted of a main body 2 formed in a box shape, in which an aperture 2a is arranged on the front surface, and a door 3 with which the aperture 2a of the main body 2 is freely opened and closed. A retaining hole 10 is bored in a pedestal 9 fixed on a bottom part of the main body 2, and a protrusion 24 is protruded on the lower end of a bracket 17 where a printed board 16 is mounted on the back. In the bracket 17, the protrusion 24 is pivotally supported with the retaining hole 10, and the upper part is attached with a screw on a fixing member 11 fixed on the main body 2. The width L2 of both side portions 23 of the bracket is formed slightly larger than the distance L1 between the inner surface of the back 2b of the main body 2 and the end surface of the front side of the retaining hole 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board fixing structure for fixing a printed circuit board via a bracket in a housing having an opening formed on one surface.

[0002]

2. Description of the Related Art In general, in a printed circuit board fixing structure of this type, when a maintenance person contacts a printed circuit board during maintenance and inspection, electronic components mounted on the printed circuit board may be adversely affected. It is fixed via a bracket for protection. The bracket is also used when it is desired to attach an operation manual explaining the operation of switches mounted on the printed circuit board.
That is, a printed circuit board is once mounted on a bracket, a manual is attached to the surface of the bracket to form a printed circuit board unit, and the bracket is fixed to a fixing member provided in the housing with screws.

[0003]

However, in the above-described conventional printed circuit board fixing structure, the bracket is fixed only at the upper and lower positions or at the left and right positions with only screws, so that the screwing operation is performed at two positions. It is necessary to adjust the positions of the screw holes, and the operation is complicated. In particular, when the printed circuit board is fixed to the deepest part of the housing, the work cannot be performed at hand, so that the work is further complicated and requires skill.
It required a lot of work time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a printed circuit board fixing structure which improves workability and shortens work time.

[0005]

In order to achieve this object, the present invention is directed to a printed circuit board fixing structure for fixing a printed circuit board in a housing having an opening formed on one side via a bracket. In the housing, a locking portion for locking one end of the bracket and a fastening portion for fastening the other end of the bracket are provided, and a bracket is sandwiched between the locking portion and an inner surface of the housing. is there. Therefore, when one end of the bracket is locked and the other end is brought into contact with the fastening portion, the other end is aligned with the fastening portion, so that when the fastening portion is fastened, the bracket strongly contacts the inner surface of the housing,
The bracket is firmly held by the locking portion and the inner surface of the housing. According to a second aspect of the present invention, in the first aspect of the present invention, a locking portion is provided on a bottom side of the housing having an opening formed on the front surface, a fastening portion is provided on an upper side of the housing, and the bracket is provided on the bracket. Both sides are formed so as to be in contact with the inner surface of the rear surface of the housing, and a bracket is sandwiched between the locking portion and the inner surface of the rear surface of the housing. Therefore, the printed circuit board is surrounded by both sides of the bracket and the back of the housing, and no gap is generated between both sides of the bracket and the back of the housing.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a housing to which a printed circuit board fixing structure according to the present invention is applied, and FIG.
FIG. 3 is a perspective view showing the same part in an exploded view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 illustrates the operation of assembling the printed circuit board unit in the housing. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1.

[0007] A housing indicated by reference numeral 1 is a main body 2 formed in a box shape by a metal having an opening 2a formed on the front side.
And a door 3 formed of a metal that allows the opening 2a of the main body 2 to be opened and closed. Door 3
The lower end is rotatably supported about a support shaft 6 by a hinge 5 fixed on a base member 4 attached to the lower end of the opening 2 a of the main body 2. A receiving portion 7 is attached to the door 3. The opening 3 a of the main body 2 is closed by the door 3, and a lock (not shown) provided on a side portion of the main body 2 is rotated by a key, thereby receiving the receiving portion 7. A locking plate (not shown) is engaged with the portion 7 and is configured to be locked.

A base member 8 is attached to the bottom of the main body 2, and a base 9 made of metal and having a substantially inverted L-shaped cross section is fixed on the base member 8. Are provided with three rectangular support holes 10 arranged side by side in the left-right direction. The width l1 of the support hole 10 is formed slightly larger than the width of a projection 24 of the bracket 17 described later, and the depth l2 is formed larger than the thickness of the projection 24. The distance from the inner surface of the back surface 2b of the main body 2 to the locking surface 10a, which is the front end surface of the support hole 10, is formed at L1.

A fixing member 11 having an inverted L-shaped section made of metal is fixed to the rear inner surface of the upper portion of the main body 2 by welding, and a front portion 12 of the fixing member 11 has a pair of screw holes. 13 and 13 are screwed, and the distance from the surface of the front part 12 to the inner surface of the back part 2b of the main body 2 is formed at L1.

In FIG. 3, the reference numeral 15 designates a printed circuit board unit, which is a printed circuit board unit.
And a bracket 17 for mounting and protecting it. Three switches 18 and four indicators 19 are mounted on the printed circuit board 16, and seven through holes 20 through which screws 32 are inserted are formed at the peripheral end and the center. The bracket 17 has a front part 22 and two side parts 2
3 and is formed in a U-shape in plan view by metal,
The width L2 of both side portions 23 is formed slightly larger than L1 described above.

The lower end of the front portion 22 is provided with the support hole 10 described above.
And three projections 24 that are engaged with the switch 18 are provided at a lower portion on one side of the front portion 22.
A plurality of square windows 25 and a rectangular window 26 into which the above-described display 19 is engaged are formed. An operation manual 27 is attached to the front portion 22 and describes an operation method of the switch 18 and the like. 28a to 28c are windows for connecting a plug to a jack (not shown) of a connector of the printed circuit board 16,
29 and 30 are through holes into which screws 33 are inserted, and 31 is a sleeve interposed between the bracket 17 and the printed circuit board 16.

The switch 18 of the printed circuit board 16 has a window 25
The display 19 is engaged with the window 26, and the screw 32 inserted through the through hole 20 is inserted into the sleeve 31.
The printed circuit board 16 is attached to the back surface side of the bracket 17 by being screwed into the screw hole 30 of the bracket 17 through the, and the printed circuit board unit 15 is formed. The mounted printed circuit board 16 is mounted on the bracket 1
7 is surrounded by the front part 22 and both side parts 23,23.

In such a configuration, as shown in FIG. 5, the printed circuit board unit 15 is inserted into the inside of the main body 2 through the opening 2a of the main body 2, and the projection 24 is engaged with the support hole 10 of the base 9, By pivoting the upper side clockwise in the drawing with the support hole 10 as a pivot point, the bracket 1
The upper part of the front part 22 of 7 is brought into contact with the front part 12 of the fixing member 11. At this time, since the shoulder 24a of the projection 24 is placed on the upper surface of the base 9, the through hole 29 of the bracket 17 and the screw hole 13 of the fixing member 11 are aligned in the height direction. Further, the width of the projection 24 of the bracket 17 is
Is slightly smaller than the width l1 of the support hole 10, the protrusion 24 engaged in the support hole 10 restricts the movement of the support hole 10 in the width direction, and the through hole 29 and the screw hole 1
3 is performed in the left-right direction.

Therefore, as shown in FIG.
The upper part of the bracket 17 by the front part 1 of the fixing member 11
When attaching to 2, the positioning becomes unnecessary, and the attaching work becomes easy. In addition, the screw tightening work is
Since only the upper side of the bracket 7 is provided, parts such as fixing members and screws on the lower side of the bracket 17 can be reduced. Here, the width L2 of both sides 23 of the bracket 17 is formed to be larger than the distance L1 between the locking surface 10a of the support hole 10 and the inner surface of the back surface 2b of the main body 2. Therefore, when the upper portion of the bracket 17 is fastened to the front portion 12 of the fixing member 11 by the screw 33, both side portions 23 of the bracket 17 are slightly elastically deformed, and the end surfaces of the both side portions 23 are pressed against the inner surface of the back portion 2b. . For this reason, the end surfaces of the both sides 23 and the front surface 24 b of the projection 24 are formed by the locking surface 10 a of the support hole 10 and the main body 2.
The bracket 17 is firmly fixed in the main body 2 above and below the bracket 17 by being clamped by the rear part 2b of the bracket 17 and the upper part being attached to the fixing member 11 by the screw 33.

Therefore, even when the printed circuit board 16 is attached to the deepest portion on the rear side in the main body 2, the protrusions 24 of the bracket 17 are merely engaged with the support holes 10 of the base 9, and the through holes 29 of the bracket 17 are provided. And the screw hole 13 of the fixing member 11 are aligned, so that the bracket 17
Can be easily mounted. Further, the printed circuit board 1 is formed by both side portions 23 of the bracket 17 and the rear portion 2b of the main body 2.
6, the printed circuit board 16 is protected by these members, and the side portions 23 abut against the rear portion 2b of the main body 2, so that no gap is generated between the end surfaces of both side portions 23 and the rear portion 2b. Protection is more secure.

In this embodiment, the bracket 17
Although the projection 24 is formed at the lower end of the bracket 17 and the lower end of the bracket 17 is used as the pivot, the upper end may be used as the pivot or the side part may be used as the pivot. Further, although the end surfaces of both side portions 23 of the bracket 17 are abutted against the back surface of the main body 2, they may be abutted against both side portions of the main body 2. In order to lock the bracket 17, a projection 24 is provided on the bracket 17, and a support hole 10 for rotatably supporting the projection 24 is provided on the base 9. A bent portion is provided at the lower end of the bracket 17. A support hole is formed in the bent portion, and the base 9 is formed.
May be provided with a projection that engages with the support hole.

[0017]

As described above, according to the first aspect of the present invention, it is not necessary to perform a screw tightening operation while performing positioning, so that assembly is facilitated. In addition, since screw tightening is performed at one location, parts such as fixing members and screws can be reduced.

According to the second aspect of the present invention, the printed circuit board can be easily fixed at the deepest portion of the housing.
In addition, the printed circuit board is surrounded by both sides of the bracket and the rear part of the housing, so the printed circuit board is protected. The protection is more secure.

[Brief description of the drawings]

FIG. 1 is a front view of a housing to which a printed circuit board fixing structure according to the present invention is applied.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view showing an essential part of the printed circuit board fixing structure according to the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a cross-sectional view taken along the line IV-IV in FIG. 1 for explaining an operation of assembling the printed circuit board unit in the housing in the printed circuit board fixing structure according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Main body, 3 ... Door, 10 ... Support hole, 10a ...
Locking surface, 11 fixing member, 15 printed circuit board unit, 16 printed circuit board, 17 bracket, 23 side part, 24 projection.

Claims (2)

[Claims] 1. A printed circuit board fixing structure for fixing a printed circuit board via a bracket in a housing having an opening formed on one surface, and a locking portion for locking one end of the bracket in the housing. A fixing structure for a printed circuit board, comprising: a fastening portion for fastening the other end of the bracket; and the holding portion and an inner surface of the housing sandwiching the bracket. 2. The printed circuit board fixing structure according to claim 1, wherein a locking portion is provided on a bottom side of the housing having an opening formed on the front surface, a fastening portion is provided on an upper side of the housing, and the bracket is provided on a bracket. A printed circuit board fixing structure, wherein both sides of the rear surface are in contact with each other, and a bracket is sandwiched between the locking portion and the inner surface of the rear surface of the housing.