JPH0211832Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printed circuit board removal tool for removing a printed circuit board incorporated in a housing of an electronic device from the housing.

Printed circuit boards used in electronic devices are usually removably attached to the housing of the electronic device.
When a failure occurs in the electronic device, the printed circuit board can be removed from the electronic device to facilitate repairs such as parts replacement, or electronically, a printed circuit board with different specifications can be selectively installed. Therefore, it is possible to freely change the specifications of the entire electronic device.

When attaching or detaching a printed circuit board to the housing of an electronic device, conventionally an integrally molded attaching/detaching tool made of synthetic resin or light alloy with holes into which the mounting pins are fitted and fixed is pre-printed with the mounting pins. Those that were rotatably attached to mounting holes in the board were often used.

This item uses a separate metal part for the mounting pin,
Either the mounting pin and the mounting/detaching tool are fixed by making the hole of the mounting/detaching tool somewhat smaller than the outer diameter of the mounting pin, or the hole of the mounting/detaching tool is made slightly larger than the outer diameter of the mounting pin, and the A method of fixing the mounting pin and the detachable tool is adopted by using a headed pin as the mounting pin and caulking the insertion end of the mounting pin. Therefore, when attaching the attachment/detachment tool to the printed circuit board using attachment pins, a pin driving operation is required. Since pinning work naturally requires jigs and tools, this pinning work has become troublesome and time-consuming when manufacturing electronic devices that require a considerable number of printed circuit boards.

On the other hand, as technology advances, electronic devices have become more complex and the density of packaging on printed circuit boards has also increased. Therefore, the number of electrodes connecting the printed circuit board and the power supply has also increased.

Removing the printed circuit board from the casing of an electronic device means removing the electrode section of the printed circuit board from the connector, and requires enough force to overcome the pressing force of the connector terminal that is in contact with the electrode section. You need to pull it out. Therefore, as the number of electrodes on printed circuit boards has increased in recent years, the number of connector terminals has also increased, and as a result, it is necessary to increase the force required to remove the printed circuit board from the connector (that is, from the housing of the electronic device). It has arisen. To achieve this, it has become necessary not only to simply increase the length of the lever portion that uses the mounting pin of the extractor/detach tool as a fulcrum, but also to have a large strength sufficient to withstand the stress generated as a reaction.

Therefore, as a way to simplify the above-mentioned pin driving operation, a synthetic resin product in which the mounting pin and the extraction tool are integrally molded from the beginning has been considered, but this method was not strong enough.

In other words, in the case where the mounting pin and the extraction tool are integrally molded as shown in FIG. It is made of synthetic resin and is connected by a thin-walled hinge 5 having a diameter of 1.5 mm, and when this extractor is attached to a printed circuit board, the thin-walled hinge 5 is on the back side as shown in Figure 2, and the mounting pin 1 is press-fitted into the hole 3. It is fixed so that it can rotate freely. Therefore,
The force applied to the extractor is due to the thin hinge 5 and the mounting pin 1.
This will depend on the strength of the fit between the hole 3 and the hole 3. In addition, when removing the printed circuit board from the connector, the lever part 6 of the extraction tool is pulled up, so the mounting hole (not shown) of the printed circuit board and the mounting pin 1 are rotated. In order to allow free movement, the fitting is loose, and the removal tool may move out of the same plane parallel to the printed circuit board (hereinafter simply referred to as lateral movement), causing twisting. Therefore, considering the case where torsional force is applied, the thin hinge 5 itself has no rigidity, and even the strength of the fit between the mounting pin 1 and the hole 3 cannot be said to be strong because both are made of synthetic resin. In other words, in situations where a large extraction force is required, the torsional force is also likely to be large, so the conventional mounting pin and extraction tool that are integrally molded from synthetic resin are insufficient in strength and cannot be put to practical use. It had become a thing. Therefore, as before, a combination of an extractor and a metal mounting pin is used, and the pin driving work has not disappeared.

The present invention has been made to eliminate the above-mentioned drawbacks, and aims to provide a strong extraction tool that can withstand large extraction forces and facilitates installation work. In other words, in a printed circuit board extractor that is rotatably attached to a printed circuit board and that removes the printed circuit board from the housing of an electronic device, the main body of the extractor is divided into two parts, and the side wall of one divided body is A support shaft is integrally formed, the other divided body is integrally formed with a clamping piece provided with a hole into which the support shaft is inserted, and each divided body has an engaging claw and the engaging claw engages with the other divided body. In addition to providing an engaging stepped portion for stopping,
Each divided body is characterized in that at least two rectangular protrusions and dovetail grooves into which the protrusions fit are provided in parallel to the spindle.

The details of the present invention will be explained below by giving examples thereof and referring to the drawings.

3 and 4 show an embodiment of the invention. Reference numeral 7 designates one of the divided bodies, in which a side wall 9 is vertically provided at one end of the back plate 8, and a support shaft 10 parallel to the plane of the back plate 8 is provided.
is integrally formed on the side wall 9. Engaging step portions 11 and 12 are provided above and below the back plate 8. 13
is the other divided body, and has a clamping piece 15 vertically provided with a groove 14 into which a printed circuit board is inserted, and a hole 16 into which the support shaft 10 is inserted relatively loosely. . Further, the engagement step portions 11 and 12 are formed within the thickness of the abdominal plate 17 and
Engagement claws 18 and 19 that engage with are provided on the head and side portions of the belly plate 17, respectively.

As is clear from the above structure, the extractor according to the present invention functions by integrating two divided bodies, and at that time, the support shaft 10 is inserted into the hole 16.
It is necessary to insert it into the Therefore, in order to facilitate this work, it is recommended to provide a guide mechanism, so in this embodiment, rectangular protrusions 20, 20 are provided on the plane of the side wall 9 side of the back plate 8 of one of the divided bodies 7.
0, and a dovetail groove 21 that fits into the projections 20, 20 at a position corresponding to the projections 20, 20 on the plane part on the opposite side to the clamping piece 15 of the belly plate 17 of the other divided body 13, There are 21. It is desirable that these protrusions and dovetail grooves be provided in at least two or more locations in order to quickly integrate the divided bodies with each other.

Since the present invention has the above-described structure, when it is used, the holding piece 15 of the divided body 13 is placed in the corresponding part of the printed circuit board 22 (the part in which the mounting hole has been made in advance), and the said printed circuit board is placed in the groove 14. Place the board 22 in such a way that the mounting hole (not shown) on the printed circuit board 22 side overlaps the hole 16 of the divided body 13, and insert the support of the divided body 7 so that it passes through the mounting hole and the hole 16. Insert the shaft 10. At that time, the order is to insert the protrusions 20, 20 into the dovetail grooves 21, 21,
By gradually bringing the one divided body 7 and the other divided body 13 closer together, the support shaft 10 can be easily inserted into the mounting hole and the hole 16 of the printed circuit board. Next, when the divided body 7 and the divided body 13 are integrated without a gap, the engaging claws 18 and 19 are elastically deformed and engaged with the engaging steps 11 and 12, thereby fixing them.

According to the extractor according to the present invention, as described above, it is possible to apply the tool to the corresponding part of the printed circuit board and to attach it to the printed circuit board at the same time as the work of integrating the divided bodies. The work can be done easily by hand, without the need for jigs or tools, as all that is required is to bring the two divided bodies into contact until the engaging pawl locks into the engaging step part due to the elastic restoring force of the engaging pawl. I can do it. In addition, unlike the conventional method of tight fitting between a mounting pin and a hole, the fixing of both split bodies is achieved reliably by an engaging pawl and an engaging step, and is provided in at least two locations. The rectangular protrusion and dovetail groove ensure sufficient strength and are integrated into one piece, so even if a lateral force is applied to the extraction tool and a torsional force is applied, both parts will not disassemble. There's no need to worry. This is because, in the extractor according to the present invention, the printed circuit board is supported by the clamping pieces provided on one divided body, so the printed circuit board is supported in the gap where the divided bodies are in contact with each other as in the conventional method. This is because the torsional force does not directly cause the separation of the divided bodies as in the case.

In addition, if you want to further increase the strength, the support shaft 10
In order to increase the shear and bending stress of
It is also conceivable to embed 3 in the support shaft 10.

As a result of the above, it has become possible to obtain a structure that is strong against torsional force without requiring pin driving work, and to provide an extraction tool that can cope with an increase in extraction force.

[Brief explanation of the drawing]

Figures 1 and 2 show a conventional extraction/extraction tool that is integrally molded, Figure 1 is a perspective view of the extraction/extraction tool when it is molded, and Figure 2 is a diagram showing the extraction/extraction tool attached to a printed circuit board. It is a perspective view of a state. 3 to 5 show the extraction tool according to the present invention, FIG. 3 is an exploded perspective view of the extraction tool seen from the spindle side, and FIG. 4 is the operation side of the extraction tool. FIG. 5 is an exploded perspective view as seen from above, and FIG. 5 is a perspective view of the extraction tool attached to the printed circuit board. 7 and 13 are divided bodies, 9 is a side wall, 10 is a support shaft, 1
1 and 12 are engagement steps, 15 is a clamping piece, 16 is a hole,
18 and 19 are engaging claws.

Claims (1)

[Scope of utility model registration request] In a printed circuit board extractor that is rotatably attached to a printed circuit board and that removes the printed circuit board from a housing of an electronic device, the main body of the extractor is divided into two parts, and a support shaft is attached to the side wall of one of the divided parts. The other divided body is integrally formed with a clamping piece provided with a hole into which the support shaft is inserted, and the engaging claw is engaged with each divided body. A printed circuit board extraction tool, characterized in that an engaging stepped portion is provided, and each divided body is provided with at least two rectangular protrusions and dovetail grooves into which the protrusions fit, parallel to the spindle. .