JP3868795B2 - Board mounting device for electronic equipment housing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mounting device for an electronic device casing for storing and holding a circuit board in the casing of the electronic device such as a communication module for exchanging signals between various field devices and a central control device. It is.
[0002]
[Prior art]
In general, in order to send a detection signal from a sensor of a field device installed in a factory to the central controller and to send a control signal from the central controller to the field device, an input / output module between the field device and the central controller, An electronic device including a communication module or the like is connected.
[0003]
FIG. 6 is a perspective view of a communication module exemplified for explaining a conventional substrate mounting device for an electronic device casing. In the figure, 4 is a communication module, 8 is an electronic equipment casing, 9 is a circuit board housed in the electronic equipment casing 8, and 16 is a female connector provided on the circuit board 9. The circuit board 9 is stored in the electronic device casing 8 in a free state, and no means for preventing the circuit board 9 is provided. This is because a communication module generally has a small number of products, and thus providing a retaining structure increases costs. The electronic device casing 8 has a thin box shape in which ventilation holes 10 are formed on both right and left side walls and an opening is formed in the lower part. The communication module 4 is attached to a mother board (not shown) by a fixing member 5 locked to a pair of locking pieces 14 formed on the left and right side walls of the electronic device casing 8, and the connector 16 of the circuit board 9. Is inserted into a connector pin (not shown) on the motherboard.
[0004]
[Problems to be solved by the invention]
Since the conventional electronic device casing is in a free state in which the circuit board 9 is not fixed to the electronic device casing 8 as described above, when the electronic device casing 8 is removed from the motherboard at the time of replacement, it is connected to the connector pin of the motherboard. The circuit board 9 remains on the mother board by the female connector thus made, and only the electronic device casing 8 is removed. Therefore, it is necessary to remove the circuit board 9 again and replace it, and the replacement work is troublesome. Further, since a part of the fixing member 5 is only locked between the pair of locking pieces 14, there is a possibility that the fixing member 5 may be dropped and lost during transportation.
[0005]
Therefore, as another conventional example, an attachment piece portion for the electronic device casing is formed on the circuit board, and the attachment piece portion is screwed to the electronic device casing, or the electronic device casing is divided into two, There is a method of opening the halved housing and storing the circuit board in the housing, and then joining the 20% housing together and screwing them together. In either case, screwing is required. There is a problem that the circuit board is attached to and fixed to the electronic device casing, and the circuit board is attached and detached at the time of board replacement or maintenance, which is very troublesome and has poor workability.
[0006]
The present invention has been made to solve the above-described problems. By fixing the circuit board to the electronic device casing by simple means, the replacement work on the mother board is facilitated, and the mounting screw is provided. An object of the present invention is to obtain a substrate mounting device for an electronic device casing that prevents the loss of the device.
[0007]
[Means for Solving the Problems]
According to another aspect of the present invention, there is provided a substrate mounting device for an electronic device casing, a fixing member including a cylindrical spacer, a screw member inserted into the spacer, a stopper piece fitted into the spacer, and the spacer as the electronic device casing. And an insertion hole formed in a side wall of the electronic device casing so as to be inserted into the body and to lock the circuit board.
[0008]
According to the present invention, there is provided a substrate mounting device for an electronic device casing, a fixing member including a cylindrical spacer, a screw member inserted into the spacer, a stopper piece fitted into the spacer, and a side wall of the electronic device casing. A locking piece for locking the formed screw member; and an insertion hole formed in a side wall of the electronic device casing so as to insert the spacer into the electronic device casing to lock the circuit board. It is a thing.
[0009]
In the electronic apparatus housing substrate mounting apparatus according to the present invention, an opening having a size smaller than the diameter of the insertion hole is formed in the stopper piece so as to communicate with the hole into which the spacer is inserted.
[0010]
In the substrate mounting device for an electronic device casing according to the present invention, a rib is formed on the insertion hole surface of the stopper piece so that the stopper piece is in sliding contact.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
FIG. 1 is a perspective view of a signal conversion device to which a substrate mounting device for an electronic device casing according to Embodiment 1 of the present invention is applied. The same members or the same functions as those in FIG. Description is omitted.
In FIG. 1, A is a signal converter, 1 is a number of input / output (I / O) modules attached to the motherboard 2, 3 is a terminal block, 4 is a communication module attached to the motherboard 2, and 5 is a fixing member. is there. The mother board 2 is attached to a control panel (not shown) of the central control device through the attachment hole 6. Then, the control panel and the communication module 4 are connected and connected to various field devices via the terminal block 3 of the input / output module 1.
[0012]
Details of the communication module 4 are shown in FIGS. 2 and 3, reference numeral 8 denotes an electronic device casing of the communication module 4, and 9 denotes a circuit board accommodated in the electronic device casing 8. The electronic device casing 8 has a thin box shape in which ventilation holes 10 are formed in the left and right side walls and an opening 11 is formed in the lower part. And the latching convex part 12 is formed in the lower end part of a right-and-left both-side wall, and the attachment hole 13 facing the up-down direction is formed in this latching convex part 12. As shown in FIG. If necessary, a pair of locking pieces 14 are formed on the side wall of the electronic device casing 8 so as to be positioned above the locking projection 12 as indicated by an imaginary line.
[0013]
A female connector 16 is provided at the lower part of the circuit board 9, and notches 17 are formed at both corners of the lower end edge. The circuit board 9 is inserted into the electronic device casing 8 from the opening 11.
[0014]
As shown in FIG. 4, the fixing member 5 includes a screw member 18, a sleeve-like spacer 19, and a stopper piece 20. The screw member 18 has a shape in which a head portion 22 is formed at the upper end of the shaft portion 21 and a female screw portion 23 is formed at the lower portion of the shaft portion 21, and is loosely inserted into the spacer 19. The stopper piece 20 is formed with an insertion hole 30 into which the spacer 19 is loosely fitted. The illustrated example includes a part of the insertion hole 30 and cuts a part of the stopper piece 20 (dotted line portion 20a shown in FIG. 4). Thus, an opening 30 a having a width t smaller than the outer diameter of the spacer 19 communicating with the insertion hole 30 is formed. The stopper piece 20 can be formed at low cost by using the waste material of the circuit board 9.
[0015]
Next, the mounting procedure of the fixing member 5 will be described with reference to FIG.
As shown in FIG. 3A, the screw member 18 is inserted into the spacer 19, and the stopper piece 20 is inserted below the spacer 19. At this time, since the width t of the opening 30 a of the insertion hole 30 is smaller than the outer diameter of the spacer 19, the stopper piece 20 does not come out in the direction of the arrow X perpendicular to the axis of the spacer 19. Further, since the stopper piece 20 is reduced by the dimension W, it does not protrude to the outside during assembly and has a good appearance.
[0016]
Next, the fixing member 5 configured as described above is attached to the electronic device casing 8 in which the circuit board 9 is inserted as shown in FIG. That is, the spacer 19 is fitted between the locking piece 14 and the locking projection 12, the shaft portion 21 of the screw member 18 is positioned between the locking pieces 14, 14, and the stopper piece 20 is Insert a little into the insertion hole 24 which is the ventilation hole at the lower end.
[0017]
When the entire fixing member 5 is pushed in the direction of the electronic device casing 8 from the state of FIG. 3B, the spacer 19 is located between the locking piece 14 and the locking projection 12 as shown in FIG. The shaft portion 21 of the screw member 18 is fitted between the locking pieces 14 and 14 against the elastic force, and the stopper piece 20 is inserted into the electronic device casing 8 from the insertion hole 24. The bottom surface of the notch 17 of the circuit board 9 is locked. As a result, the circuit board 9 is locked by the stopper piece 20 and is fixed in the electronic device casing 8. The stopper piece 20 is prevented from coming off because the inner surface of the insertion hole 30 contacts the outer surface of the spacer 19. In this case, as shown in FIG. 5, two ribs 27 are formed on the upper surface of the insertion hole 24, so that even if there is a dimensional error between the stopper piece 20 and the insertion hole 24, the rib 27 is used as a stopper piece. By applying a strong frictional force to the stopper 20, the stopper piece 20 can be held without play.
[0018]
In this way, as shown in FIG. 3C, the spacer 19 is locked in the insertion hole 30 of the stopper piece 20, and is frictionally locked between the locking piece 14 and the locking convex portion 12 to be electronic. It will be in the state fixed to the apparatus housing | casing 8. FIG. Further, the screw member 18 is prevented from coming off upward when the stepped portion 23a (see FIG. 4) of the female screw portion 23 hits the locking piece 14. In the illustrated example, as indicated by an imaginary line, a pair of locking pieces 14 are formed on the side wall of the electronic device housing 8 to lock the shaft portion 21 of the screw member 18 that is a component of the fixing member 5. Accordingly, the screw member 18 is firmly held, and the loss of the screw member during transportation is reduced. However, if the holding by the stopper piece 20 is sufficient, the locking piece 14 may be omitted.
[0019]
As shown in FIG. 3C, the communication module 4 configured as described above is mounted on the mother board 2. That is, by inserting the female connector 16 of the circuit board 9 into the connector pin 26 and fitting the hole 13 of the locking projection 12 into the male screw 25 on the mother board 2 and rotating the screw member 18 of the fixing member 5, The female screw portion 23 is screwed into the male screw 25 and fixed.
[0020]
As described above, according to the first embodiment, the spacer 19 of the fixing member 5 is fitted into the side wall of the electronic device casing 8, and the stopper piece 20 attached to the spacer 19 is inserted from the insertion hole 24 on the side wall into the electronic device casing. Since the circuit board 9 is inserted into the body and the circuit board 9 is locked, and the screw member 18 in the spacer 19 is screwed into the bolt 25 of the mother board 2, the circuit board 9 is fixed to the electronic device casing 8. 4 can be easily replaced, and the single fixing member 5 can fix the electronic device casing 8 to the mother board 2 and the circuit board 9 to the electronic device casing 8. Can be produced.
[0021]
Further, since the stopper piece 20 is formed by removing a part of the insertion hole 30 to form the opening 30a having a size smaller than the outer diameter of the spacer 19, the protrusion to the outside is not caused when the stopper piece 20 is assembled to the electronic device casing 8. There is no appearance. The spacer 19 is locked inside the insertion hole 30 and does not come out outward, and is securely locked to the electronic device casing 8. In addition, since the rib 27 on which the stopper piece 20 is slidably contacted is formed in the insertion hole 24 of the electronic device casing 8, even if there is a slight dimensional error between the stopper piece 20 and the insertion hole 24, the rib 27 The stopper piece 20 can be reliably held by the frictional contact between the stopper piece 20 and the stopper piece 20. In addition, since the insertion hole 24 should just use the original ventilation hole, it is not necessary to form again.
[0022]
【The invention's effect】
As described above, according to the present invention, the spacer of the fixing member is fitted into the side wall of the electronic device casing, and the stopper piece attached to the spacer is inserted from the insertion hole of the side wall to lock the circuit board. As a result, the circuit board is fixed to the electronic device casing. Therefore, it is easy to replace the communication module as the electronic communication device, and the fixing of the electronic device casing to the motherboard and the circuit board with one set of fixing members. Can be fixed to the electronic device casing, and a fixing member having a simple configuration can be manufactured at low cost.
[0023]
In addition, according to the present invention, since the locking piece for locking the screw member which is a component of the fixing member is formed on the side wall of the electronic device casing, the screw member is firmly held, and the screw member during transportation or the like This has the effect of reducing the loss of dropping.
[0024]
Further, according to the present invention, the stopper piece communicates with the spacer insertion hole and is formed with an opening having a size smaller than the outer diameter of the spacer, so that the spacer is locked inside the insertion hole and is aligned with the axis of the spacer. It does not come off in the orthogonal direction and is securely locked to the electronic device casing, and when the stopper piece is inserted into the insertion hole of the electronic device casing, there is no protrusion to the outside and the appearance is good. effective.
[0025]
Further, according to the present invention, since the rib on which the stopper piece slides is formed on the insertion hole surface, even if there is a slight dimensional error between the stopper piece and the insertion hole, the rib and the stopper member There is an effect that the stopper piece can be securely held without play by frictional contact.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of a signal converter exemplified for explaining a mounting board device for an electronic device casing according to Embodiment 1 of the present invention;
FIG. 2 is a perspective view of a substrate mounting device for an electronic device casing according to the present invention.
FIG. 3 is a cross-sectional view showing a mounting procedure of a fixing member in the electronic apparatus housing mounting apparatus according to the present invention.
FIG. 4 is an exploded perspective view of a fixing member.
FIG. 5 is an enlarged view of a side wall portion of the electronic device casing.
FIG. 6 is a perspective view showing a conventional substrate mounting apparatus for an electronic device casing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Input / output module 2 Motherboard 3 Terminal block 4 Communication module 5 Fixing member 6 Mounting hole 8 Electronic equipment housing 9 Circuit board 10 Ventilation hole 11 Opening part 12 Locking convex part 13 Hole 14 Locking piece 16 Female connector 17 Notch part 18 Screw member 19 Spacer 20 Stopper piece 21 Shaft portion 22 Head portion 23 Female screw portion 24 Insertion hole 27 Rib 30 Insertion hole 30a Opening portion A Signal converter

Claims (4)

In the board mounting device for an electronic device casing in which the circuit board is detachably accommodated from the opening end in the electronic equipment casing having one end opened, and the circuit board is fixedly held on the electronic equipment casing.
A fixing member composed of a cylindrical spacer, a screw member inserted into the spacer, a stopper piece fitted into the spacer, and the stopper piece inserted into the electronic device casing to lock the circuit board. And an insertion hole formed in the side wall of the electronic device casing. In the board mounting device for an electronic device casing in which the circuit board is detachably accommodated from the opening end in the electronic equipment casing having one end opened, and the circuit board is fixedly held on the electronic equipment casing.
A fixing member comprising a cylindrical spacer, a screw member inserted into the spacer, a stopper piece fitted into the spacer, and a locking piece for locking the screw member formed on the side wall of the electronic device casing And an insertion hole formed in a side wall of the electronic device casing so as to insert the stopper piece into the electronic device casing and lock the circuit board. apparatus. 3. The substrate of the electronic device casing according to claim 1, wherein the stopper piece communicates with a hole into which the spacer is inserted and has an opening having a size smaller than the outer diameter of the spacer. Mounting device. 4. The board mounting of an electronic device casing according to claim 1, wherein a rib on which the stopper piece slides is formed on the insertion hole surface of the stopper piece. apparatus.

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