JPH0453031Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] This invention is an electronic circuit package in which the electronic circuit package is prevented from being removed by a leaf spring attached to the electronic circuit package, and the retention is released by bending and deforming the leaf spring. In the retaining device, in order to prevent excessive deformation of the leaf spring due to overload and injury when releasing the retainer, a block is provided in the electronic circuit package to regulate the amount of deflection of the leaf spring. A lever is attached to the tip to release the lock.

[Industrial application field]

The present invention relates to an improvement in a device for retaining an electronic circuit package inserted into an electronic circuit unit frame.

[Conventional technology]

Generally, an electronic circuit package is equipped with a connector for an interface at its end, and a back board provided at the rear of the electronic circuit unit frame having an opening on the front side has a receiving connector that fits with the connector of the electronic circuit package. installed. Usually, an upper protruding wall and a lower protruding wall that extend parallel to each other are provided on the front surface of the electronic circuit unit frame, and a plurality of notches that oppose each other are formed in the upper protruding wall and the lower protruding wall. .
The electronic circuit package is inserted into the unit frame through the notch in the upper projecting wall and the notch in the lower projecting wall, and the connector of the electronic circuit package is inserted into the receiving connector of the backboard.

Electrical connectors were used in conventional general electronic circuit packages, and the contact holding force between the electrical connector and the receiving connector was the holding force for the electronic circuit package. There was no particular need to prevent it from coming off. However, in recent years, with the shift to optical interfaces, the number of electronic circuit packages using optical plug-in connectors has increased.

Generally, optical plug-in connectors are
There is a built-in spring on the jack side to minimize connection point loss, and the structure is such that the spring always presses the connection point with a constant force. For this reason, a force is exerted to push the electronic circuit package back toward the front of the unit frame, and a structure for preventing the electronic circuit package from slipping out has become necessary.

On the other hand, from the viewpoint of high-density mounting of electronic circuit packages within the unit frame, maintainability, safety, etc., the structure for preventing package removal requires miniaturization, ease of locking and unlocking operations, and safety. It is said that

FIGS. 4 and 5 each show a conventional example of a structure for preventing the electronic circuit package from coming off. In these figures, a projecting wall 2 is provided at the upper part of the front surface of the unit frame 1, and a notch 2a for passing an electronic circuit package 3 is provided at the lower edge of the projecting wall 2.

The retaining device shown in FIG. 4 includes a substantially L-shaped metal fitting 5 fixed to the unit frame 1 with rivets or the like 4, and a block 6 fixed to the electronic circuit package 3. The block 6 is provided with a hole through which a screw 7 is passed, and the metal fitting 5 is provided with a screw hole into which the screw 7 is screwed. In this conventional example, after the package 3 is inserted into the unit frame 1, the screw 7 passed through the block 6 is screwed into the screw hole of the metal fitting 5, thereby preventing the package 3 from coming off.

The retaining device shown in FIG. 5 includes a leaf spring 9 fixed to the electronic circuit package 3 with rivets or the like 8, and the leaf spring 9 is attached to a first arm 9 extending diagonally upward.
a and a second arm 9b extending obliquely downward from the base of the first arm 9a. In this conventional example, when the package 3 is inserted into the unit frame 1, the distal end side of the first arm 9a of the leaf spring 9 comes into contact with the lower edge of the protruding wall 2 and is bent downward. After the insertion of the package 3 is completed, the first plate spring 9 is
When the arm 9a returns upward and the tip of the first arm 9a comes into contact with the back surface of the protruding wall 2 of the unit frame 1, it is locked and the package 3 is prevented from coming off. On the other hand, when pulling out the package 3 forward from within the unit frame 1, the tip of the second arm 9b of the leaf spring 9 is pushed down with a finger to bend and deform the first arm 9a downward. As a result, the first arm 9a and the protruding wall 2 are disengaged and the lock is released.

[Problem that the invention attempts to solve]

In the case of the conventional retaining structure shown in Fig. 4, work efficiency is poor because a screwdriver is required to tighten the screws.Furthermore, it is necessary to attach the metal fitting 5 to the unit frame 1, which increases the cost and the installation work. The drawback was that it became troublesome. Furthermore,
Since the area for mounting components on the package 3 is narrowed by the downward protruding width D of the metal fitting 5 shown in the shaded area in FIG. 4, there is a problem in that the density of mounting components on the package 3 is reduced.

On the other hand, in the case of the conventional example shown in FIG. 5, it is necessary to use a relatively thin leaf spring to ensure flexibility. However, if an overload is applied to the second arm 9b of such a thin leaf spring 9 during the unlocking operation, the first arm 9a and the second arm 9b will undergo plastic deformation, causing the locking by the first arm 9a or its release. The problem was that it became difficult. Another drawback is that the thin leaf spring 9 is susceptible to plastic deformation due to impacts during transportation or handling. Furthermore, since the leaf spring 9 is thin, the edge of the second arm 9b, which is operated by fingers, becomes sharp, which poses a safety problem.

[Means for solving problems]

In view of the above problems, the present invention has developed an electronic device that prevents excessive deformation of the leaf spring due to overload, prevents the locking and release functions of the leaf spring from being impaired, and ensures the safety of the lock release operation. The purpose of the present invention is to provide a circuit package retaining device.

According to the present invention, there is provided a retaining device for an electronic circuit package inserted into a unit frame through a notch provided in a protruding wall defining an opening on the front surface of the unit frame. It has a proximal end portion fixed to the electronic circuit package so as to be able to pass through the opening, and a distal end portion that can come into contact with the inner wall surface of at least one protruding wall of the unit frame, and the distal end portion side is connected to the unit frame. A leaf spring that can be flexibly deformed toward the opening side, and a lever for releasing the retainer that has one end attached to the tip of the leaf spring in order to flexibly deform the tip portion of the leaf spring toward the opening side of the unit frame. There is provided an electronic circuit package retaining device comprising: a block fixed to the electronic circuit package and regulating the amount of deflection deformation of a leaf spring.

[Effect]

In the electronic circuit package removal prevention device according to the present invention, when the electronic circuit package is inserted, the tip end side of the leaf spring comes into contact with the edge of the opening side of the protruding wall of the unit frame, and is deformed toward the opening side, thereby preventing the unit from being removed. Pass through the opening in the frame. Then, when the insertion of the electronic circuit package is completed, the leaf spring returns to its original position, and its tip comes into contact with the inner surface of the protruding wall, thereby preventing the electronic circuit package from coming off. On the other hand, when pulling out the electronic circuit package from within the unit frame, the lever is operated to flex and deform the leaf spring, thereby displacing the tip portion of the leaf spring toward the opening of the unit frame. This allows the leaf spring to pass through the opening in the unit frame. In other words, the retention by the leaf spring is released. Since the amount of flexural deformation of the leaf spring is regulated by the block fixed to the electronic circuit package, even if an overload is applied to the leaf spring, excessive deformation of the leaf spring can be prevented. Therefore, it is possible to prevent the lock function and lock release function from being impaired due to plastic deformation of the leaf spring. Furthermore, since the lock can be released by operating a lever separate from the leaf spring, the safety of operation will not be reduced even if a relatively thin leaf spring is used.

Preferably, the proximal portion of the leaf spring is attached to the block. This simplifies the structure of the retaining device itself, and also facilitates attachment of the retaining device to the electronic circuit package.

Preferably, the lever has a substantially U-shaped portion on which the operator's fingers are placed. By placing a finger on this substantially U-shaped portion, the leaf spring can be easily released from being prevented from coming off.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. First, referring to FIG. 1, the unit frame 21 has an upper wall 21a, a lower wall 21b, and both side walls 21c, 21d. An upper protruding wall 22 and a lower protruding wall 23 defining an opening are provided, respectively. The upper protruding wall 22 and the lower protruding wall 23 each have a plurality of notches 22 that open toward the opening side of the unit frame 21.
a, 23a are provided at intervals along the longitudinal direction of the protruding wall, and the notches 2 of the upper protruding wall 22
2a and the notch 23a of the lower protruding wall 23 face each other.

The electronic circuit package 24 is a printed wiring board 25
have. In the illustrated embodiment, an optical connector 26 and an electrical connector 2 are provided at one end of the printed wiring board 25.
7 are arranged above and below. Although not shown, the backboard attached to the rear of the unit frame 21 is provided with receiving connectors compatible with these connectors 26 and 27. Illustrations of other electronic circuit components disposed on the printed wiring board 25 are omitted.

When inserting the electronic circuit package 24 shown by the solid line in FIG. 1 into the unit frame 21,
The upper and lower ends of the printed wiring board 25 pass through mutually opposing notches 22a and 23a. Connector 2
6 and 27 are connected to the receiving connector, the insertion of the electronic circuit package 24 is completed, as shown by the chain line in FIG. Since the illustrated electronic circuit package 24 has an optical connector 26 on its upper side, the spring force applied to the connection between the optical connector 26 and the receiving connector exerts a pushing force on the upper part of the electronic circuit package 24.

Printed wiring board 25 of electronic circuit package 24
is provided with a retaining device 28 for preventing the electronic circuit package 24 from coming off against the above-mentioned push-back force. Referring to FIGS. 2 and 3, the retaining device 28 includes a leaf spring 29 and a block 30.
and a lever 31. The block 30 is positioned on the printed wiring board 25 so that it passes through the opening of the unit frame 21 when the printed wiring board 25 passes through the notches 22a and 23a, and is secured by screws 32 shown in FIG. It is fixed to a printed wiring board 25.

The block 30 has front and rear end surfaces 30a and 30 in the insertion direction of the electronic circuit package 24.
b, an upper surface 30c, and a lower surface 30d. The top surface 30c and end surface 30a of the block 30 are connected by a rounded corner portion 30e. Also, the end surface 30b and the lower surface 30 of the block 30 are
A notch 30 consisting of two orthogonal surfaces is provided between the
f is formed.

The base end portion 29a of the leaf spring 29 is fixed to the front end surface 30a of the block 30 by a screw 33, and thereby fixed to the printed wiring board 25 of the electronic circuit package 24. Leaf spring 2
9 is curved near the corner 30e of the block 30 to match the roundness of the corner 30e, as indicated by the reference numeral 29b. The leaf spring 29 has an intermediate portion 29c that extends obliquely upward from the curved portion 29b toward the end surface 30b of the block 30, and the tip portion 29d of the leaf spring 29 extends from the upper end of the intermediate portion 29c. It extends downward so as to face the rear end surface 30b of the block 30.

The upper end portion 31a of the lever 31 is attached to the tip portion 29d of the leaf spring 29 by a rivet 34. Other methods for attaching the lever 31 include spot welding and the like. Lever 31
The lower part 31b is bent into a substantially U-shape so that the fingers of the operator's hand can be easily caught inside the lower part 31b. The approximately U-shaped portion 31b is the block 30.
It is possible to engage with the notch 30f of.

The tip portion 29d of the leaf spring 29 is in a position where it can come into contact with the inner surface of the upper protruding wall 22 of the unit frame 21, as shown by the solid line in FIG. Below 22,
That is, it can be displaced toward the opening of the unit frame 21. When the leaf spring 29 is bent downward to the extent that it can pass through the opening of the unit frame 21, the lower surface of the intermediate portion 29c of the leaf spring 29 comes into contact with the upper surface 30c of the block 30. Therefore, the leaf spring 29 will not bend downward any further.

In the above embodiment, the electronic circuit package 24
When the upper protruding wall 22 is inserted, the lower edge of the upper protruding wall 22 comes into contact with the upper surface of the intermediate portion 29c of the leaf spring 29, so that the leaf spring 29
bends downward. Then, the tip portion 2 of the leaf spring 29
When the spring 9d passes the lower edge of the upper protruding wall 22, it returns to its original position due to its spring properties, so that when the electronic circuit package 24 is inserted, the tip portion 29d of the leaf spring 29 comes into contact with the inner surface of the upper protruding wall 22. ,
To prevent the electronic circuit package 24 from coming off.

When removing the electronic circuit package 24 from within the unit frame 21, the leaf spring 29 is bent downward by hooking a finger on the inside of the lower U-shaped portion 31b of the lever 31 and pushing the lever 31 downward. As a result, the tip portion 29d of the leaf spring 29
comes off from the upper protruding wall 22 and the retainer is released,
The electronic circuit package 24 can now be removed.

When releasing the retainer or when electronic circuit package 2
Even if an excessive force is applied to the lever 31 during transportation of the device 4, the block 30 prevents the leaf spring 29 from being excessively bent and deformed. There is no loss of functionality.

The leaf spring 29 is made of a relatively thin spring material so that it can be easily bent with a light force, but the lever 31 is made of a hard plate material, thereby preventing the lever 31 from being deformed. Furthermore, by making the lever 31 from a relatively thick plate material, the edge of the lever 31 can be rounded, eliminating the risk of the operator operating the lever 31 injuring his or her fingers.

Although the illustrated embodiments have been described above, the present invention is not limited to the embodiments described above. For example, the block may be formed from a relatively thin, rigid plate. Alternatively, the leaf spring may be fixed to the top surface of the block. Alternatively, the leaf spring and the block may be overlapped and fixed to the printed wiring board at the same time using common rivets, screws, etc. Furthermore, if necessary, a retaining device may be provided at the upper and/or lower portion of the electronic circuit package.

[Effect of idea]

As is clear from the above description, according to the present invention, since the amount of deflection of the leaf spring is regulated by the block fixed to the electronic circuit package, even when an overload is applied to the leaf spring, It is possible to prevent the leaf spring from being excessively deformed. Therefore,
It is possible to prevent the lock function and lock release function from being impaired due to plastic deformation of the leaf spring. Also,
Since the lock can be released by operating a lever separate from the leaf spring, the safety of operation is not reduced even if a relatively thin leaf spring is used. Therefore, it is possible to provide a highly reliable and safe electronic circuit package retaining device.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an application example of an electronic circuit package retaining device according to an embodiment of the present invention;
FIG. 2 is a partially sectional side view showing the use state of the retaining device shown in FIG. 1, FIG. 3 is an exploded perspective view showing the retaining device shown in FIG. 2 in the middle of assembly, and FIGS. Each figure is a perspective view showing a conventional example of a retaining device. In the figure, 21 is a unit frame, 22 and 23 are protruding walls, 22a and 23a are notches in the protruding walls, and 24
28 is an electronic circuit package, 28 is a retaining device, 29 is
29a is a leaf spring, 29a is a base end portion of the leaf spring, 29d is a tip end portion of the leaf spring, 30 is a block, 31 is a lever, and 31b is a substantially U-shaped portion of the lever.

Claims (1)

[Claims for Utility Model Registration] 1. Notches 22a and 2 provided in the protruding walls 22 and 23 defining the front opening of the unit frame 21
A retaining device 28 for the electronic circuit package 24 inserted into the unit frame 21 through 3a
A base end portion 29a fixed to the electronic circuit package 24 so as to be able to pass through the opening of the unit frame 21, and a distal end portion capable of abutting against the inner wall surface of at least one protruding wall 22 of the unit frame 21. 2
9d, the tip end portion 29d side of which is flexibly deformable toward the opening side of the unit frame 21; a lever 31 for releasing the retainer, one end of which is attached to the tip portion 29d of the leaf spring 29; and a block 30 fixed to the electronic circuit package 24 to regulate the amount of deflection deformation of the leaf spring 29.
A device for retaining an electronic circuit package, comprising the following. 2 The base end portion 29a of the leaf spring 29 is connected to the block 30.
The device for preventing the electronic circuit package from coming off as set forth in claim 1, wherein the device is attached to the electronic circuit package. 3. The electronic circuit package retaining device according to claim 1, wherein the lever 31 has a substantially U-shaped portion 31b on which the operator's finger is placed.