JPH0793506B2 - PCB guide rails - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a guide rail for mounting a board such as a printed board.

[Prior Art] Conventionally, when a board such as a printed board is mounted in a case, side portions of the board are fixed by being inserted into grooves of guide rails provided on both sides of the case. Generally, in the case where the board is mounted in this way, a conductive material is used in order to remove the noise that is transmitted to the power supply line on the board and is electrically connected to the ground pattern on the board. There is. For example, as shown in FIG. 6, a case c is provided with a screw mounting portion a, and an earth pattern p on a board k formed in the guide rail g direction and the case c are electrically connected by a screw b. is there.

[Problems to be Solved by the Invention] However, in the case of using such an electrical connection by means of screws, when the board mounted on the guide rail is removed, the ground screw is purposely loosened by a driver and then the board is removed. Had to be pulled out, which was very troublesome. Especially when the boards are mounted in multiple stages, when removing the middle-level board, if you do not loosen and pull out the grounding screws in order from the top-level board, The screw could not be loosened, which was very time-consuming. In addition, if a metal guide rail is used and the ground pattern is configured to directly contact the metal guide rail, there will be no such trouble, but the ground pattern will be scraped off by the guide rail by repeated mounting and removal of the board. The scraped metal powder may cause a trouble such as a short circuit in an electric circuit.

The board guide rail of the present invention has an object to solve the above-mentioned problems and to easily handle and electrically connect the pattern formed on the board and the case.

Configuration of the Invention The configuration of the present invention that achieves the above object will be described below.

[Means for Solving the Problems] The board guide rail of the present invention is arranged in a case having a conductive portion, accommodates the board in the case, and forms a predetermined pattern on the board. A guide rail for a board that conducts electricity to the conductive part, the insulating rail body having a groove for inserting the board, and a rail mounted on the rail body when the board is mounted in the insertion groove. A conductive pressing member that presses the substrate; and the rail body that is provided with a back portion that abuts the case when the rail body is disposed in the case, and the rail main body projects from the back portion to form the insertion groove. A pair of guide portions, and the pressing member includes an abutment plate that is formed so as to be able to abut the back portion, and a side plate that is erected from the abutment plate and that is arranged along the guide portion. Projected at the tip of the side plate A pressing portion protruding toward the insertion groove, and a lateral plate extending from the contact plate and bent toward the side opposite to the side plate with respect to the surface of the contact plate, Further, the rail main body is provided with an attachment hole for inserting the side plate from the back side to attach the pressing member.

[Operation] In the board guide rail of the present invention having the above configuration, the pressing portion is attached to the rail body by inserting the side plate into the attachment hole provided in the rail body from the back side of the rail body. When the rail body is attached to the case, the contact plate comes into contact with the back portion of the rail body, and the horizontal plate is extended from the contact plate and bent toward the side opposite to the side plate (that is, the case side). Comes into contact with the case, and the lateral plate acts as a leaf spring, so that the end portion of the lateral plate presses the case.

On the other hand, the side plate inserted through the mounting hole is arranged in the insertion groove, and the pressing portion protruding at the tip thereof is in a state of protruding toward the inside of the insertion groove. Then, when the substrate is inserted into the insertion groove and the pressing portion is displaced by the substrate, the side plate acts as a leaf spring and presses the pressing portion against the surface of the substrate.

In other words, if the conductive portion and the predetermined pattern are formed such that the horizontal plate presses the conductive portion of the case and the pressing portion presses the predetermined pattern formed on the substrate, the conductive portion of the case and the substrate The predetermined pattern formed on is electrically connected via a pressing member.

[Embodiment] In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the board guide rail of the present invention will be described below.

FIG. 1 is a perspective view showing a state in which a board guide rail as one embodiment is attached to a board housing case. The main body of the resin guide rail 1 is integrally formed of guide portions 3 and 5 facing each other along the longitudinal direction thereof and a back portion 7 connecting the guide portions 3 and 5 in a U-shape.
The guide portions 3 and 5 and the back portion 7 form a groove portion 9 surrounded on three sides. On the back surface of the guide rail 1, two locking portions 11 integrally formed with the back portion 7 are provided so as to project. As shown in FIG. 2, the locking portion 11 is composed of two facing locking claws 13 and 15, and the elasticity of the locking claws 13 and 15 allows the locking claws 13 and 15 to bend in the directions of arrows a and b. There is. The locking claw 13 is a plate-shaped projection plate that is provided so as to project from the back portion 7.
13a and a wedge-shaped claw portion 13 provided on the top of the protruding plate 13a.
Similarly, the locking claw 15 includes a protrusion plate 15a and a claw portion 15b.
Consists of.

For the sake of description below, the direction of arrow a or b will be referred to as the width direction, the axial direction of the guide rail 1 will be simply referred to as the axial direction, and the protruding direction of the locking portion 11 will be referred to as the thickness direction.

The guide portions 3 and 5 of the guide rail 1 are formed with holes 17 and 19 which are long in the axial direction and which sandwich the locking portion 11 in the width direction.

In the holes 17 and 19, the pressing metal fitting 21 shown in FIG.
Inserted from the side. The pressing fitting 21 includes side plates 23 and 25 facing each other, an insertion plate 29 having the square holes 27 formed in the center by connecting the side plates 23 and 25 in a U-shape, and both sides of the insertion plate 29. Horizontal plates 31,33,35,37 extending in pairs of the same shape, and side plates 2
3 and contact plates 39, 41 extending in the side plate 25 and facing each other and bent in a substantially triangular shape. Each of these plates is integrally formed of a metal such as phosphor bronze, which is electrically conductive and does not easily form an oxide insulating coating on the surface. Further, the guide rail 1 corresponds to the rail body of the present invention, the pressing fitting 21 corresponds to the pressing member, the contact plates 39 and 41 correspond to the pressing portions, and the insertion plate 29 corresponds to the contact plate.

The rectangular hole 27 formed in the insertion plate 29 has a lateral length slightly longer than the axial length of the locking portion 11 and a vertical length of the locking portion 11 shown in FIG. It is formed to be slightly longer than the maximum length in the width direction when pressed in the direction of the arrow b, and shorter than the maximum length in the width direction when released from the press. Also, insert plate
The horizontal plates 31, 33, 35, 37 extended to 29 are bent on the side of the insertion plate 29 opposite to the side plates 23, 25.

The contact plates 39, 41 have contact parts 39a, 41a facing each other and bent in a "V" shape. The contact plates 39, 41 each have two bent parts so that the contact plates 39, 41 can function as a leaf spring. , Contact part
The force acting to widen the gap between 39a and 41a acts in the opposite direction, that is, to reduce the gap. The distance between the contact portions 39a and 41a is made smaller than the thickness of the board B mounted on the guide rail 1. Also, contact plate 3
The distance from 9,41 to the insertion plate 29 is slightly larger than the thickness of the back portion 7 of the guide rail 1.

Next, a method of mounting the guide rail 1 in the case C for housing the board will be described with reference to FIG.

First, the pressing fitting 21 is inserted from the back 7 side of the guide rail 1. That is, the locking claw 13 and the locking claw 15 of the locking portion 11 are compressed in the direction of arrow a and inserted into the rectangular hole 27 of the insertion plate 29, and the contact plates 39 and 41 are inserted into the holes 17 and 19, respectively. To do. At this time, the contact portions 39a, 41a are compressed in the surface direction of the side plates 23, 25 to form holes 17, 19
To insert. When the contact portions 39a, 41a reach the groove 9, the contact portions 39a, 41a are located in the groove 9 due to the action of the springs of the contact plates 39, 41 to reduce the distance between them. Then, once the press fitting 21 is inserted into the guide rail, the claw portions 13b, 15b of the locking portion 11 are inserted.
Is locked to the insertion plate 29, and the contact portions 39a, 41a contact the side surface of the groove 9 of the back portion 7, so that the pressing metal fitting 21 cannot be disengaged from the guide rail 1.

The conductive case C is provided with a rectangular hole CH having the same size as the rectangular hole 27 of the pressing member 21. The locking portion 11 of the guide rail 1 on which the pressing fitting 21 is mounted is aligned with this square hole CH, and the locking portion 11 is inserted into the square hole CH as it is. At this time, the locking pawls 13 and 15 are pressed in the direction of the arrow a and elastically deformed and inserted into the rectangular hole CH, but the pawl portions 13b and 15b are inserted into the rectangular hole C.
When it passes through H, its deformation returns, so it opens in the direction of arrow b and engages with the case C. Thus, the guide rail 1
Is attached to the case C. In this state, press fitting 21
The end portions of the horizontal plates 31, 33, 35, 37 are pressed against the inner surface of the case C by the action of the leaf springs. Therefore, the pressing fitting 21 and the case C are electrically connected.

Next, the operation when the board B is inserted into the guide rail 1 attached to the case C in this way will be described with reference to FIGS.
It will be described with reference to the drawings. As shown in FIG. 4, the contact portions 39 a and 41 a of the pressing metal fitting 21 are located in the groove 9 when the board B is not inserted into the pressing metal fitting 21. From this state, when the board B is inserted in the direction of the arrow c, the tip of the board B contacts the contact plates 39 and 41 of the pressing fitting 21, and the contact plate 3
Spread 9,41 in the direction of arrow d. Then, the substrate B is inserted while the contact portions 39a and 41a are in pressure contact with the surface (front and back) of the substrate B.

When the board B is inserted into the predetermined position, the pressing metal fitting 21
A plan view of the vicinity is shown in FIG. On the substrate B, a pattern P printed as a circuit for connecting each element such as an IC is formed. The ground pattern EP (hatched) of the pattern P is extended to a position where the contact portion 39a of the pressing fitting 21 mounted on the guide rail 1 presses the board B. Therefore, the contact portion 39a of the pressing fitting 21 presses the earth pattern EP, so that the earth pattern EP is case C.
Electrically connected to.

According to the board guide rail as the present embodiment described above, the locking portion 11 of the guide rail 1 is formed in the rectangular hole of the pressing fitting 21.
By inserting the contact plates 39 and 41 of the pressing member 21 into the holes 17 and 19 of the guide rail 1 while inserting the pressing member 21 into the hole 27, the pressing member 21 can be easily attached to the guide rail 1. By inserting the locking portion 11 into the rectangular hole CH of the case C, the board guide rail can be easily attached to the case C. At the same time, when the board guide rail is attached to the case C, the horizontal plates 31, 33, 35, 37 of the pressing metal fitting 21 prevent the pressing metal fitting 2 from being connected without wiring.
The conduction between 1 and the case C can be secured. Further, it is not necessary to provide a special mounting member for mounting the pressing fitting 21 on the guide rail 1. For this reason, the work of assembling the board guide rail and the attachment to the case can be easily performed, and the productivity is improved.

Further, the board guide rail attached to the case C can electrically connect the case C and the ground pattern EP on the board B by the pressing metal fitting 21 only by mounting the board B in the groove 9. As a result, when the board B is inserted and removed,
The screwing work, which has been performed to secure the electrical connection between the board B and the case C, is unnecessary, and the operability when inserting and removing the board B can be improved.

In addition, the pressing metal fitting 21 attached to the guide rail 1
The contact plates 39 and 41 are located in the groove 9 and the guide rail 1
If the case is attached to the case C, the insertion plate 29 and the lateral plates 31,3
Since 3,35,37 are located between the back portion 7 of the guide rail 1 and the case C, there is no portion protruding from the guide rail 1 to the outside. Therefore, when the board B is inserted or removed, the worker does not touch the pressing metal fitting 21 to get injured, and the work can be performed safely. Further, since the front and back surfaces of the substrate B are clamped by the pressing metal fitting 21, the connection with the ground pattern EP is possible irrespective of the thickness of the substrate B, and the clamping pressure also prevents the rattling of the substrate B. . On the other hand, in the substrate B,
It is not necessary to provide the earth pattern EP widely along the case C, but it is sufficient to extend the earth pattern EP at a position facing the pressing fitting 21. Of course, even a substrate having an earth pattern all around, such as an analog circuit, can be used.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. For example, instead of the configuration in which the earth pattern EP is connected, the power source pattern is connected to the case C, and The configuration may be such that the power source for the board B is taken from the case C. Also in this case C, the main body is made of synthetic resin, and a metal plate or the like is provided at a position where the pressing metal fitting 21 abuts to connect to another circuit.
It may be configured to be grounded. Further, in the present embodiment, the pressing metal fitting 21 is inserted into the locking portion 11 to be attached, but an attaching hole may be provided at an arbitrary position of the back portion 7 to be attached, within a range not departing from the gist of the present invention. Of course, it can be implemented in various modes.

EFFECTS OF THE INVENTION As described in detail above, according to the board guide rail of the present invention, the board guide rail can be easily assembled only by inserting the side hole into the insertion hole of the rail body, and moreover, the board guide rail can be installed in the case. Simply by attaching the pressing member to the case, the pressing member can be electrically connected to the conductive portion of the case without wiring. Therefore, it is possible to easily assemble the board guide rail and attach it to the case.

In addition, the board guide rail attached to the case is
Only by mounting the board in the insertion groove, the case conductive portion and the predetermined pattern on the board can be electrically connected by the pressing member. As a result, the work of attaching and detaching screws, which was performed to secure the electrical connection between the board and the case when inserting and removing the board, becomes unnecessary, and the operability when inserting and removing the board is improved. You can

Further, in the pressing member attached to the rail main body, the side plate is located in the insertion groove, and when the rail main body is attached to the case, the contact plate and the horizontal plate are located between the back part and the case. Therefore, there is no part protruding to the outside. For this reason, the worker does not get injured by touching the pressing member when the substrate is inserted or removed, and the work can be performed safely.

Moreover, since the electrically conductive pressing member is partially attached to the insulating rail, the substrate mounted in the case can be effectively used. That is, when a conductive rail is used to ground the substrate, a portion other than the ground pattern cannot be formed on the portion of the substrate that comes into contact with the rail. Other than the portion to be pressed, for example, signal lines may be formed, and the substrate can be used freely. Further, since the pressed pattern and the conductive part of the case are kept at the same potential, if the conductive part of the case is grounded and the pressing member is connected to the ground pattern, it is useful for noise prevention. By connecting the conductive portion of the case to the power source pattern by the pressing member, it is possible to supply power to another substrate.
Furthermore, since the substrate is pressed by the pressing member, rattling of the substrate is also prevented.

[Brief description of drawings]

FIG. 1 is a perspective view when a guide rail is attached to a case, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a perspective view of a pressing metal fitting, and FIG. 4 is a partial front view of the guide rail. FIG. 5 is a partial plan view for explaining the connection between the earth pattern and the pressing fitting, and FIG. 6 is a plan view for explaining the conventional technique. 1 ... Guide rail, 9 ... Groove 21 ... Press fitting, 39,41 ... Contact plate 31,33,35,37 ... Horizontal plate C ... Case, B ... Board P ... Pattern, EP ... … Earth pattern

Claims (1)

[Claims] 1. A case having a conductive part is disposed,
A guide rail for a board that accommodates the board in the case and electrically connects a predetermined pattern formed on the board to the conductive portion, and an insulative rail body having a board insertion groove. A conductive pressing member that is attached to the rail main body and presses the board when the board is mounted in the insertion groove; A back portion that abuts on the case; and a pair of guide portions that project from the back portion and that form the insertion groove; and the pressing member includes an abutting plate that is abuttable on the back portion. A side plate that is erected from the contact plate and is arranged along the guide portion, a pressing portion that protrudes from the tip end portion of the side plate and projects toward the insertion groove, and extends from the contact plate. The side above the surface of the contact plate And a lateral plate bent toward the opposite side, and further, the rail body is provided with a mounting hole for mounting the pressing member by inserting the side plate from the back side. Characteristic board guide rails.