JP2005005324A - Housing of electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the housing of an electronic apparatus which can prevent a printed circuit board from dropping out with a simple structure. <P>SOLUTION: The housing of the electronic apparatus includes an upper guide rail 2a and a lower guide rail 3a laid on opposed positions of upper and lower surfaces of the housing 100 of the electronic apparatus to introduce the printed circuit board to the housing 100 of the electronic apparatus by engaging a printed board 9, an upper guide beam 5 and a lower guide beam 6 installed at side edges of one end side of the upper guide rail 2a and the lower guide rail 3a and having cutout grooves 11 for grasping the printed board 9 at the position corresponding to the ends of both the guide rails, and an elastic element 8 for fixing an installing position of the upper guide beam 5 to the housing 100 of the electronic apparatus so as to be adjustable in a vertical direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electronic device casing.
[0002]
[Prior art]
Generally, a printed circuit board on which electronic components are arranged can be attached to and detached from a housing of an electronic device. This is to improve workability such as maintenance and inspection of the printed circuit board. A guide rail is provided on the outer frame of the electronic device casing as a device to make it easy to attach and detach the printed circuit board to and from the electronic device casing, and the side edge of the guide board is fitted into the groove of the guide rail. It is done by inserting while making it. The accommodated printed circuit board is supported by the groove of the guide rail, and is fixed by being connected to a connector provided on a backboard or the like on the back of the housing.
[0003]
However, when a plurality of printed circuit boards are mounted on the electronic device housing, the bottom surface portion of the housing bends downward due to the weight of the printed circuit board. By the way, when the electronic device casing is installed on a host device or when adjustment work is performed, the printed circuit board may be supported only by the guide rail and not connected to the connector provided on the backboard or the like. At this time, if the frame of the housing is bent due to the weight of the printed circuit board, etc., the printed circuit board falls off the guide rail and falls to the side, and the printed circuit board is brought into contact with the adjacent printed circuit board to print. There is a problem that the substrate is damaged.
[0004]
As a solution to the above problem, for example, in the board mounting apparatus disclosed in Patent Document 1, it is formed integrally with guide rails provided on the upper and lower surfaces of the casing that supports the printed circuit board, and maintains a predetermined interval between the upper and lower surfaces. A technique for preventing the printed board from being detached from the guide rail by providing the interval holding means is disclosed.
[0005]
[Patent Document 1]
JP-A-2001-284856 [0006]
[Problems to be solved by the invention]
However, in the method disclosed in Patent Document 1, since it is necessary to provide interval holding means for each guide rail, the structure of the housing becomes complicated, the number of parts increases, and there is a disadvantage in cost. It was. Conventionally, a method of cutting and raising a sheet metal is often used for manufacturing a guide rail. However, when the above method is applied to a casing manufactured by this method, there is a problem that man-hours increase.
[0007]
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electronic device casing that can prevent the printed circuit board from falling off with a simple structure.
[0008]
[Means for Solving the Problems]
An electronic device casing according to the present invention is an electronic device casing for storing a printed circuit board on which electronic components are arranged in the casing, and is laid longitudinally in the front-rear direction at positions facing each other above and below the casing. An upper guide and a lower guide for guiding the printed circuit board to connect to a connector in the housing, and a notch groove capable of gripping the upper edge or the lower edge of the printed circuit board when the printed circuit board is inserted or removed. A beam that corresponds to the position of the guide and is supported by the front end of the housing so that it can move up and down, and is moved by the printed circuit board when it is inserted and removed, and when the printed circuit board is not connected to the connector, And an elastic part that urges the beam toward the printed circuit board according to the amount.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1A is a perspective view of an electronic device casing 100 according to Embodiment 1 of the present invention, and FIG. 1B is an enlarged view of a portion B in FIG. 1A. 2 is a front view of the electronic device casing 100 as viewed from the front, FIG. 3A is a cross-sectional view of the electronic device casing 100 taken along the line AA in FIG. 2, and FIG. It is an enlarged view of the C section in 3 (a). The electronic device casing 100 has a box shape with an open front surface. In the electronic device casing 100, an outer frame is formed by the upper plate 2, the lower plate 3, and the two side plates 4. The upper plate 2 and the lower plate 3 are symmetrical. The front end portion of the side plate 4 is bent outward to form a flange portion 4a for attaching the electronic device casing 100 to a rack (not shown).
[0010]
On the upper plate 2, upper guide rails 2 a extending in the front-rear direction are provided between the front end portion and the rear end portion in the lateral direction at a predetermined interval. Further, the lower plate 3 is provided with a lower guide rail 3 a similarly to the upper plate 2. As many printed circuit boards 9 as the number of the upper guide rails 2a and the lower guide rails 3a can be accommodated. The upper guide rail 2a and the lower guide rail 3a are formed by raising the upper plate 2 and the lower plate 3.
[0011]
In addition, as shown in FIG. 2, a backboard 10 that contacts the rear end portions of the upper plate 2, the lower plate 3, and the side plates 4 and closes the back portion is provided on the back portion of the electronic device casing 100. . A connector 10a is attached to the back board 10 at a position on the extension of the upper guide rail 2a and the lower guide rail 3a, and each connector 10a is electrically connected via a connection circuit on the back board 10. .
[0012]
An upper guide beam 5 and a lower guide beam 6 having notch grooves 11 corresponding to the positions of all the upper guide rails 2a and the lower guide rails 3a are attached to the front end portions of the upper plate 2 and the lower plate 3, respectively. Yes. The installation position of the upper guide beam 5 projects forward from the lower guide beam 6 as shown in FIG. The upper guide beam 5 and the lower guide beam 6 are used for positioning when the printed circuit board 9 is inserted and have a function of gripping the stored printed circuit board 9.
[0013]
As shown in FIG. 1B, the upper guide beam 5 is attached to the upper plate 2 by a pin 7 and an elastic body 8 (elastic portion). The upper guide beam 5 can be pushed up in the direction away from the upper plate 2, that is, in the upper side. In the pushed-up state, a force for returning the upper guide beam 5 downward is generated by the effect of the elastic body 8. . Here, the elastic body 8 is, for example, a coil spring. The lower end of the pin 7 is fixed to the upper plate 2, and the pin 7 passes through the upper guide beam 5 and the coil spring. A head having a wider cross-sectional area than the others is formed at the top of the pin 7, and a coil spring is compressed between the head and the upper guide beam 5.
[0014]
A printed circuit board connector 9a is attached to the printed circuit board 9 accommodated in the electronic device casing 100. By accommodating the printed circuit board 9 in the electronic device casing 100, the printed circuit board connector 9a and the connector 10a are fitted, Both wirings are electrically connected.
[0015]
Next, the storing operation of the printed circuit board 9 in the electronic device casing 100 will be described. 4 and 5A are views for explaining the storage of the printed circuit board in the electronic device casing 100. FIG. FIG. 5B is an enlarged view of a portion D in FIG.
[0016]
When the printed circuit board 9 is stored in the electronic device casing 100, first, the upper end of the printed circuit board 9 is fitted into the cutout groove 11 of the upper guide beam 5 as shown in FIG. 4. Next, as shown in FIG. 5A, the lower end of the printed circuit board 9 is fitted into the notch groove 11 of the lower guide beam 6 by the weight of the printed circuit board 9.
[0017]
When the printed circuit board 9 is fitted in the upper and lower cutout grooves 11 as shown in FIG. 5A, the upper guide beam 5 resists the force of the elastic body 8, as shown in FIG. Is pushed up by the printed circuit board 9. At this time, a downward force is applied to the upper guide beam 5 by the elastic body 8, and the upper guide beam 5 moderately presses the printed circuit board 9 from above.
[0018]
When the electronic device casing 100 is installed on a host device or when adjustment work is performed, for some printed circuit boards 9, the printed circuit board connector 9a and the connector 10a are not connected, and only the upper guide rail 2a and the lower guide rail 3a are connected. The state of supporting with occurs. In a state where a plurality of printed circuit boards 9 are housed in the electronic device casing 100, the upper edge of the printed circuit board 9 is located on the upper side due to the bending of the printed circuit board 9 due to the weight of the printed circuit board 9, the gap between the upper plate 2 and the lower plate 3. The guide rail 2a may be easily detached.
[0019]
However, as described above, the upper guide beam 5 moderately presses the printed circuit board 9 from above due to the effect of the elastic body 8, so that the upper edge of the printed circuit board 9 can be prevented from coming off from the upper guide rail 2a.
[0020]
Further, as shown in FIGS. 4 and 5A, the installation position of the upper guide beam 5 is in front of the installation position of the lower guide beam 6, so that the printed circuit board 9 is simultaneously fitted to the upper and lower guide beams. There is no need, and mounting work is easy.
[0021]
When the printed circuit board 9 is fitted in the notch grooves 11 of the upper and lower guide beams, the printed circuit board 9 is slid along the upper guide rail 2a and the lower guide rail 3a in this state. By completely pushing the printed circuit board 9, the printed circuit board connector 9a is fitted into the connector 10a, and the storage is completed.
[0022]
Since the length of the printed circuit board 9 in the front-rear direction is smaller than the distance from the connector 10a to the cutout groove 11 of the upper guide beam 5, in the state where the printed circuit board connector 9a is fitted to the connector 10a, FIG. As shown in b), the upper front end of the printed circuit board 9 is not caught in the notch groove 11 of the upper guide beam 5. For this reason, even when one or more printed circuit boards 9 are stored in a state where the printed circuit board connector 9a and the connector 10a are fitted, the upper guide beam 5 presses the printed circuit board 9 from which the connector is not fitted from above. be able to.
[0023]
As described above, according to the first embodiment, the lower edge portion of the printed circuit board 9 is fitted to the lower guide beam 6 and the lower guide rail 3a by the weight of the printed circuit board 9 itself, and the upper edge portion is By pressing the printed circuit board 9 with the upper guide beam 5 and the elastic body 8, it is possible to prevent the printed circuit board 9 from falling off the upper guide rail 2a.
[0024]
When the upper guide beam 5 is installed in front of the lower guide beam 6 and the printed circuit board connector 9a is fitted to the connector 10a, the upper front end of the printed circuit board 9 is formed in the cutout groove 11 of the upper guide beam 5. Since it is not hung, even when one or more printed circuit boards 9 are stored in a state where the printed circuit board connector 9a and the connector 10a are fitted, the printed circuit board 9 not fitted with the connector can be pressed from above. it can. Further, since the printed circuit board 9 can be inserted without being fitted to the upper guide beam 5 and the lower guide beam 6 at the same time, the operation of mounting the printed circuit board 9 can be facilitated.
[0025]
Further, since the upper guide beam 5 and the lower guide beam 6 can be configured regardless of the shape of the guide rail, for example, the guide rail may be formed by integrally extracting a sheet metal, and the guide beam may be a separate part. . Thereby, the existing method can be utilized for manufacture of an electronic device housing | casing. In addition, since the guide rail can be formed without being crafted, the number of parts can be reduced, and there is an effect that it can be implemented at a low cost.
[0026]
In the first embodiment, the upper guide beam 5 is attached to the upper plate 2 with the pin 7 and the elastic body 8, and the upper guide beam 5 pushes down the printed circuit board 9 against the force of the elastic body 8. The lower guide beam 6 may be attached to the lower plate 3 with the pin 7 and the elastic body 8 so that the lower guide beam 6 pushes up the printed circuit board 9.
Further, the guide beam may be provided only on the surface opposite to the side where the guide beam is attached so as to be movable up and down with the pin 7 and the elastic body 8 without providing the guide beam.
[0027]
【The invention's effect】
As described above, according to the present invention, there is an effect that it is possible to obtain an electronic device casing that prevents the printed board from falling off with a simple configuration and prevents the printed board from being damaged.
[Brief description of the drawings]
1A is a perspective view of an electronic device casing according to Embodiment 1 of the present invention, and FIG. 1B is an enlarged view of a portion B in FIG.
FIG. 2 is a front view of the electronic device casing as viewed from the front according to the first embodiment of the present invention;
3A is a cross-sectional view of the AA cross section in FIG. 2 of the electronic device casing according to Embodiment 1 of the present invention, and FIG. 3B is an enlarged view of a portion C in FIG. 3A. is there.
FIG. 4 is a view for explaining accommodation of the printed circuit board in the electronic device casing according to the first embodiment of the present invention.
5A is a view for explaining accommodation of a printed circuit board in an electronic device casing according to Embodiment 1 of the present invention, and FIG. 5B is an enlarged view of a portion D in FIG. 5A. FIG.
[Explanation of symbols]
2 Upper plate, 2a Upper guide rail, 3 Lower plate, 3a Lower guide rail, 4 Side plate, 4a Flange, 5 Upper guide beam, 6 Lower guide beam, 7 Pin, 8 Elastic body, 9 Printed circuit board, 9a Printed circuit board connector 10 Backboard, 10a Connector, 11 Notch groove, 100 Electronic equipment casing.

Claims (3)

An electronic device housing that houses a printed circuit board on which electronic components are arranged in the housing,
An upper guide and a lower guide that are laid longitudinally in the front-rear direction at positions opposite to each other above and below in the housing, and guide the printed circuit board to connect to a connector in the housing;
Has a notch groove that can hold the upper edge or lower edge of the printed circuit board when the printed circuit board is put in and out, corresponds to the position of the upper guide and the lower guide, and can be moved up and down to the front end of the housing A beam supported and moved by the printed circuit board at the time of loading and unloading;
An electronic device housing comprising: an elastic portion that biases the beam toward the printed circuit board according to the amount of movement of the beam by the printed circuit board when the printed circuit board is not connected to the connector. body. The beam supported so as to be movable in the vertical direction is an upper beam that grips the upper edge of the printed circuit board.
Comprising a lower beam in which a notch groove is formed for gripping the lower edge of the printed circuit board when the printed circuit board is slid along the upper guide and the lower guide;
2. The electronic device casing according to claim 1, wherein the lower beam is disposed at a fixed position in front of the upper guide and the lower guide and rearward of the upper beam. When the printed circuit board is connected to the connector, the printed circuit board is held in a notch groove formed in the lower beam, and when the printed circuit board is removed from the connector, the printed circuit board is connected to the upper beam and the lower beam. The electronic device casing according to claim 2, wherein the electronic device casing is gripped by a notch groove formed in the base.

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