JPH05291770A - Mechanism of inserting circuit board into shelf - Google Patents

Abstract

PURPOSE:To improve insertion work efficiency and improve productivity by preventing the falling off of a circuit board from a shelf, in the insertion mechanism of the circuit board into the shelf. CONSTITUTION:This is a mechanism of inserting a circuit board, the lower part of which is a main circuit board, into the corresponding slot of a shelf, in which a plurality of circuit boards are connected through connectors, and the lever 33, which inserts the board 31 into the regular position with the cam action at the time when the lever 33 held at insertion and extraction is rotated in the specified position at insertion, is equipped with a lock lever 35 which can rotate in the shape of a seesaw in the same direction to the lever 33 at the T-shaped center. And, an elastic member 36 for separating the region from the lever 33 is installed in the region on one side of the top of the lock lever 35 which can be held with the lever 33, and at the other end of the top is made a notch 35b which engages with the notch 32b being made in the position above the lever fixing tool 32 corresponding to the other end of the top of the lock lever 35 in the lever position at the time when the board 31 is inserted into the regular position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for inserting a circuit board into a shelf on which a plurality of circuit boards are mounted. Particularly, the insertion workability is improved and the circuit board is prevented from falling off the shelf due to external force or the like. The present invention relates to a shelf insertion mechanism for a circuit board, which has improved reliability.

[0002] Various electronic equipments are often composed of a plurality of circuit boards (daughter boards), but in such a case, generally, a plurality of circuit boards are mounted on one or a few shelves of a main circuit board (daughter board). A means for connecting to a mother board) to reduce the size of the device and improve the workability of assembly is often used.

On the other hand, the number of various devices such as semiconductor devices mounted on individual circuit boards is increasing with the recent progress of electronic technology. This means that the number of input / output signals to / from the circuit boards is large. This means that the number of circuits connected to the main circuit board is increased and the number of cores of the connector is increased, and as a result, the insertion / removal force at the time of attachment / detachment between the circuit board and the main circuit board is increased.

In this case, the work of attaching and detaching the circuit board is usually carried out manually, but especially when an excessive insertion force is applied at the time of insertion, damage to the circuit board or the connector and thus the main circuit board may be induced, so that the insertion connection is made. Various techniques have been put into practical use for improving the workability at the time.

[0005]

2. Description of the Related Art FIG. 3 which is a sectional view of a part of a shelf is a view for explaining a conventional shelf insertion mechanism of a circuit board.
-1) is a diagram showing the circuit board alone, and (3-2) is a diagram showing the state when the shelf is installed.

In FIG. 3, a plurality of electronic devices such as semiconductor devices 11
A plurality of (two in the figure) jack connectors (hereinafter referred to as “jack connectors”) connected to the electronic devices 11 and mounted on a main circuit board 21 as a mother board are provided at one longitudinal end of the circuit board 1 as a daughter board on which are mounted. A connection electrode 1a that can be fitted and connected to a connector 22) is formed by patterning.

Further, lever fixing tools 12 are attached to both corners at the other end of the circuit board 1 by means of screwing or the like, and each lever fixing tool 12 has a shaft 12a planted therein. An L-shaped lever 13 which can be freely rotated by means of a claw portion 13b having a length shorter than that of the operating portion 13a is attached so as to face the width direction of the substrate 1.

In the lever 13, when the operating portion 13a is positioned parallel to the longitudinal direction of the substrate 1 as shown by the broken line A in the drawing, the tip 13b 'of the claw portion 13b has a side 1b in the width direction of the substrate 1.
The lever fixing device 12 so that it projects more by a predetermined length a.
The length of the claw portion 13b from the center of rotation of the claw portion 13b of the claw portion 13b when the lever 13 is rotated to the outer side in the width direction of the substrate 1 by, for example, about 45 degrees as indicated by an arrow b ₁ . The tip 13b 'is formed so as to be located near the side 1b of the substrate 1.

Accordingly, the lever 13 the distal end 13b 'of the claw portion 13b by reciprocally rotated so as to A That arrow b _1, b ₂ from addition B from A to B from the side 1b of the substrate 1 The protrusion can be eliminated or the protrusion can be eliminated.

On the other hand, the innermost part of the main circuit board (motherboard) 21 on which a plurality (two in the figure) of the above-mentioned connectors 22 corresponding to the circuit board 1 are aligned in parallel at a constant pitch is mounted. The shelf 2, which is a wall surface, is formed by inserting the above-mentioned circuit board 1 into the connector 22.
A board guide frame 23 in which a guide groove 23a is formed in parallel with each other to guide and insert the board 1 at a position corresponding to the side edge 1b of the board, and the circuit board 1 when the circuit board 1 is inserted into the connector 22. Claw part 13 of L-shaped lever 13 explained in (3-1) of board 1
The board fixing frame 24 having the wide groove 24a formed in the thickness direction of the board 1 at the position corresponding to b and the main circuit board 21 maintain their relative positional relationship with the housing 25.
It is configured to be fixed to.

Particularly, in this case, the position of the wide groove 24a of the board fixing frame 24 with respect to the claw portion 13b is such that the board 1 insertion side wall surface 24a 'of the groove 24a inserts the board 1 into the normal position of the connector 22. The L-shaped lever 13 in the state
Tip 13 of the claw part 13b when it is positioned at
It comes into direct contact with b '.

This means that when the L-shaped lever 13 is positioned at the position indicated by the solid line B in (3-1), the circuit board 1 is inserted into the shelf 2 along the guide groove 23a. In other words, when the insertion force increases sharply, in other words, the L-shaped lever 13 is rotated in the b ₂ direction at a position where the tip side 1a 'of the connection electrode 1a forming region of the substrate 1 contacts a terminal (not shown) of the connector 22. The rotation of the claw portion 13b means that the circuit board 1 itself is pushed into the shelf 2 and then to the connector 22.

Therefore, the substrate 1 can be inserted into a predetermined position of the connector 22 by locating the lever 13 at the position A in the drawing. In this case, the length of the claw portion 13b is the same as that of the operating portion as described above. It is formed shorter than 13a.

Therefore, the turning force of the lever 13 in the b ₂ direction can be made smaller than the insertion force with respect to the connector 22, and the mechanical shock can be eliminated by performing the rotation slowly, resulting in the insertion workability. A good circuit board shelf insertion mechanism is now configurable.

When the circuit board in the inserted state is taken out, it can be easily carried out by manually pulling out the free circuit board after rotating the lever 13 in the b ₁ direction.

[0016]

However, in the shelf insertion mechanism of the circuit board having the conventional structure, since the L-shaped lever 13 is in a free state in which it can rotate with respect to the circuit board 1.
When inserting a single circuit board, there is a problem in that the lever 13 must be fixed with a finger or the like and improvement in insertion workability cannot be expected, and in the inserted circuit board 1, there is a problem. Since the lever 13 is not fixed, there is a problem that the lever 13 may rotate in the width direction of the circuit board due to external force or vibration of the device, and the circuit board 1 may drop from the connector 22 and then the shelf 2. there were.

[0017]

SUMMARY OF THE INVENTION The above-mentioned problems are solved in a shelf in which a bottom is a main circuit board as a mother board and a plurality of circuit boards as daughter boards orthogonal to the main circuit board can be connected in parallel through connectors. In a corresponding shelf insertion mechanism of the circuit board, a cam action of the lever of the circuit board gripped at the time of insertion / removal into / from the shelf is rotated in a direction along the board surface at a predetermined position during insertion. The lever of the circuit board, which has means for inserting the circuit board to the proper position, has a low side view.
The lock lever is formed in a letter shape and can rotate in a seesaw shape in the same direction with respect to the lever at its substantially central protruding portion. The lock lever can be grasped together with the lever. An elastic member that always acts to separate the lock lever from the lever is attached, and the other end of the top side of the lock lever has the top of the lock lever at the lever position when the circuit board is inserted to the normal position. This is achieved by a shelf insertion mechanism for a circuit board, which is formed by forming a hook that engages with a notch formed at a position on the lever fixture corresponding to the other end of the side portion.

[0018]

If the L-shaped lever of the circuit board can be positioned with respect to the board both when the board is inserted and when it is inserted into the shelf, the workability of inserting the circuit board into the shelf can be improved. It is possible to prevent the inserted circuit board from falling off the shelf.

Therefore, in the present invention, the L-shaped lever that rotates with respect to the lever fixture fixed to the circuit board is pressed in one direction by the spring material to position the fixture at the same time.
A lock lever attached to the L-shaped lever is hooked to a lever fixing tool for positioning and fixing the L-shaped lever to the fixing tool with respect to the circuit board inserted into the shelf and further to the connector.

Therefore, it is possible to realize a shelf insertion mechanism for a circuit board, which can improve productivity by improving insertion workability and preventing the circuit board from falling off due to external force or the like.

[0021]

1 is a view for explaining a shelf insertion mechanism of a circuit board according to the present invention, and FIG. 2 is a view for explaining the operation principle of FIG. 1 in time series.

In each of the drawings, the case of the circuit board corresponding to the shelf 2 described in FIG. 3 is taken as an example, and therefore, in FIG. 1, only circuit boards involved in the present invention are extracted and shown in order to avoid redundant description. In addition, in FIGS. 1 and 2, the same target members and parts as those in FIG. 3 are represented by the same symbols.

At one longitudinal end of a circuit board 31 as a daughter board on which a plurality of electronic devices not shown in FIG. 1 are mounted, the connection electrode 31a described with reference to FIG. 3 is formed by patterning.

Lever fixtures 32 similar to those shown in FIG. 3 are attached to both corners at the other end of the circuit board 31 by screwing means. Further, each lever fixture 32 has a recess except the screwing region. An L-shaped lever 33, which can be freely rotated by sandwiching the step surface 32 'on both sides by a shaft 32a implanted in the step surface 32' region of the step portion 32 ', has a shorter length than the operating portion 33a as in FIG. A bifurcated claw portion 33b is attached so as to face outward in the width direction of the substrate 31.

The lever 33 has an operating portion 33a shown in FIG.
Is attached to the fixture 32 so that the tip 33b 'of the claw portion 33b protrudes from the side 31b in the width direction of the substrate 31 by a predetermined length a when positioned at the position indicated by the broken line A in FIG. The length of the portion 33b from the center of rotation is such that when the lever 33 is positioned at the position shown by the solid line B in FIG.
Similar to the case of FIG. 3, b'is located near the side 31b of the substrate 31.

Therefore, by rotating the lever 33 back and forth between A and B in FIG.
It can be projected or eliminated from 31b. Further, as shown in the partial extraction sectional view (a) on the rear surface side of the protruding portion of the claw portion 33b of the lever 33, at the portion of the concave hole 33c formed along the front wall surface, the side wall surface of the concave hole 33c region is formed. A lock lever 35 having a T-shape with a low side view, which can be freely rotated with respect to the lever 33 by a fixed shaft 34 passing through, is mounted.

The long top portion 35a of the lock lever 35
Has an inwardly bent hook 35b formed at its end on the lever fixture side, and the hook 35b abuts when the lock lever 35 is rotated. A notch 32b having a shape to which the hook 35b is hooked is provided.

A U-shaped spring 36 is fitted in the vicinity of the other end of the apex portion 35a of the lock lever 35 between the recess 33c of the lever 33 and the other apex portion of the apex portion 35a. The end side is always positioned so as to be separated from the L-shaped lever 33.

This means that the L-shaped lever 33 has a broken line A in FIG.
When in the position shown by, the hook 35 of the lock lever 35 is
It is shown that b is locked by pressing the notch 32b portion of the lever fixture 32 described above.

Therefore, the lock lever 35 is attached to the U-shaped spring.
Unless it is rotated against 36, the lock lever 35 and thus the L-shaped lever 33 cannot rotate. Therefore, when the lock lever 35 is rotated with respect to the L-shaped lever 33, the hook 35b of the lock lever 35 is notched on the side surface of the lever fixture 32.
Since it is disengaged from 32b, the L-shaped lever 33 can be rotated with respect to the lever fixing member 32.
Since the 35 must be consciously rotated, the L-shaped lever 33 can be prevented from rotating due to an unexpected external force or the like.

Therefore, the L-shaped lever 13 described with reference to FIG. 3 is replaced with the L-shaped lever 33 provided with the lock lever 35, and the lever fixing tool 12 of FIG. 3 is replaced with the lever fixing tool 32 having the notch 32b. The required circuit board 31 can be configured with.

FIG. 2 for explaining the operation principle in time series shows a state in which a part of the circuit board 31 explained in FIG. 1 and a part of the board fixing frame 24 of the shelf 2 explained in FIG. It is extracted and shown, (a) shows a state when the circuit board 31 is inserted into the shelf 2, and (b) shows a state when the circuit board 31 is inserted to a predetermined position. The state when the lock lever 35 described in 1 is rotated is further (d)
Represent the states when the L-shaped lever 33 is rotated.

A state in which the lock lever 35 is gripped together with the L-shaped lever 33 and rotated in the direction of the L-shaped lever 33- (d) in the figure.
Insert the circuit board 31 into the shelf 2 in the state shown by
When the L-shaped lever 33 is rotated together with the lock lever 35 in the arrow C direction (b ₂ direction in FIG. 3) at the position where the insertion force described in FIG. 3 becomes heavy, the tip 33b ′ of the claw portion 33b of the L-shaped lever 33 is rotated. Is in contact with the insertion side wall surface 24a 'of the wide groove 24a of the board fixing frame 24 to be in the state shown in (a).
As a result, there is a non-inserted area of α between the shelf 2 and the circuit board 31 corresponding to the connection area of the connector.

Then, when the L-shaped lever 33 is further rotated,
Although relatively the substrate 31 since the distal end 33b 'has the insert side wall 24a' pushes up the can be lowered to the normal shown in (b) the state as shown by the arrow C _1, in this state the lock lever 35 Since the hook 35b of the L-shaped lever 33 is locked in the notch 32b of the lever fixing member 32, the L-shaped lever 33 does not rotate.

On the other hand, when the circuit board 31 is removed, if the lock lever 35 is gripped together with the L-shaped lever 33, the lock lever 35 rotates in the direction of the L-shaped lever 33 and the lock lever 35 rotates.
The locked state between 35 and the lever fixture 32 can be released to the state shown in (c).

Therefore, when the L-shaped lever 33 is rotated together with the lock lever 35 in the direction of arrow D, the tip 33b 'of the lever 33 can be removed from the wide groove 24a of the substrate fixing frame 24 (e).
In this state, the circuit board 31 can be removed as it is as D ₁ .

After that, when the gripping of the L-shaped lever 33 is stopped, the lock lever 35 is returned by the U-shaped spring 36 as shown by the broken line E, and the hook 35b of the lock lever 35 is released from the lever fixing tool.
Since it abuts on the upper surface of 32, the L-shaped lever 33 is also positioned and its free rotation can be suppressed.

[0038]

As described above, according to the present invention, there is provided a shelf insertion mechanism for a circuit board which improves the productivity by improving the insertion workability and preventing the circuit board from falling off due to external force during the work. be able to.

In the description of the present invention, the elastic member for pressing the lock lever in one direction is a U-shaped spring. However, the elastic member is not limited to the U-shaped spring, and the material itself such as a coil spring or rubber may be used. The same effect can be obtained by interposing an elastic material.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a shelf insertion mechanism of a circuit board according to the present invention.

FIG. 2 is a diagram for explaining the operation principle of FIG. 1 in time series.

FIG. 3 is a diagram illustrating a conventional shelf insertion mechanism of a circuit board.

[Explanation of symbols]

31 Circuit board (daughter board) 31a Connection electrode 32 Lever fixture 32 'Concave step surface 32a Shaft 32b Notch 33 L-shaped lever (lever) 33a Operating part 33b Claw part 33b' Tip 33c Recessed hole 34 Shaft 35 Lock lever 35a Top side 35b Hook 36 U-shaped spring (elastic member)

Claims (1)

[Claims] 1. A shelf insertion of the above-mentioned circuit board corresponding to a shelf whose bottom surface is a main circuit board as a mother board and a plurality of circuit boards as daughter boards which are orthogonal to the main circuit board can be connected in parallel through connectors. Mechanism that holds the lever (3
The circuit board is moved by the cam action of the lever (33) when 3) is rotated in a direction along the board surface at a predetermined position during insertion.
The circuit board (3) provided with means for inserting the (31) into the proper position.
The lever (33) of 1) is configured as a T-shape having a low side view, and is provided with a lock lever (35) capable of pivoting in a seesaw shape in the same direction with respect to the lever (33) at a substantially central protrusion thereof. , The top side (35a) of the lock lever (35) that can be gripped together with the lever (33) is located on one side of the lever (33) at all times.
When an elastic member (36) acting in the direction of separating from 3) is mounted, and the circuit board (31) is inserted to the regular position at the other end of the top side (35a) of the lock lever (35). Notch (32b) formed at a position on the lever fixture (32) corresponding to the other end of the top side of the lock lever (35) in the lever position of
A shelf insertion mechanism for a circuit board, characterized in that a hook (35b) for engaging with is formed.