JPH0140203Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a plug for printed circuit boards, and more specifically, for use in printed circuit boards such as electronic circuit devices.
This invention relates to a plug for printed circuit boards that prevents solder from entering unused wiring holes during soldering work.

When assembling electronic circuit devices used for various purposes, first a predetermined circuit diagram is printed on the board, holes are made based on it, and holes are inserted into the holes.
After inserting parts such as ICs, capacitors, and resistors, dip the back side of the printed circuit board in melted solder liquid and solder where necessary. In this case, the through holes formed in the printed circuit board are usually drilled in excess to take into consideration design changes that may occur during the work, and there may be delays in labor for some parts. In many cases, soldering is carried out with some unused through holes left in order to attach components that are sensitive to heat such as diodes later, or to components that cannot be immersed in soldering liquid.
Then, due to capillarity, the solder liquid will seep into the uninserted holes of the component, and it will take a lot of effort and time to remove it later, so in order to prevent this, Conventionally, unused through holes have been protected by temporarily inserting a toothpick or a protective pin into the unused through hole, applying soldering, and then removing the toothpick or the like. However, since this was a makeshift method and tools such as toothpicks were used, the results were never satisfactory in terms of work procedure and effectiveness.

Therefore, the purpose of the present invention is to overcome the above-mentioned drawbacks and to
To provide a plug for a printed circuit board, which is suitable for being inserted into unused holes of various printed circuit boards and used to prevent solder from penetrating into the unused holes.

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

What is shown in FIGS. 1 and 2 is an embodiment of the present invention, and what is indicated by the reference numeral 1 in FIG. The pin part 2 and the handle part 3 are each made of heat-resistant plastic to which solder does not adhere, for example, fluororesin such as Teflon. The pin part 2 is formed, for example, as a cylinder having a conical tip 2a, while the handle part 3 is formed integrally with the pin part 2, and has a shape that is easy to grasp, for example, a rectangular cross section with rounded corners. have These plugs are integrally molded in the shape of a large number of plugs arranged side by side as shown in the figure. For chips, 2.54mm)
corresponds to Also, as is clear from Figure 2,
A groove 3a extending in the longitudinal direction between the pins 2 and 2 is provided on one or both sides, and the cross section of the handle 3 of the plug 1 is formed into a substantially hexagonal shape, so that one or the necessary number of plugs can be broken off and used. I can do it. When a large number of consecutive holes are used at the same time, the effect of protecting several through holes at the same time can be obtained.

In addition to fluororesins, possible materials for the plug include synthetic resins such as phenolic resins, fluororesin silicone rubber, and epoxy resins, as well as light alloys and stainless steel.

Such a plugging unit is made by pouring about half of the synthetic resin described above into a mold, then arranging the required number of pins at predetermined intervals, and then pouring the remaining half of the synthetic resin into the top. It can be easily manufactured by molding.

Next, the usage and effects of this embodiment configured as above will be explained.

Lead wires 9 (Fig. 3) for ICs, capacitors, resistors, etc. are set in the holes at predetermined positions on the perforated printed circuit board 8, and then single or multiple lead wires are inserted into the predetermined holes to be protected. Insert the stopper 1 to be used as a row, and solder from the back side of the board. Then, solder 10 is applied to the ICs, capacitors, and resistors protruding from the back side of the board 8 (Fig. 3), but the pin part 2 of the plug 1 is made of a material such as stainless steel, light alloy, or resin to which solder does not adhere. Since the solder is used, it can be removed even after the solder has solidified, and in that case, the through hole is protected without being blocked.

Therefore, according to the present invention, when assembling a circuit device on a printed circuit board, it is possible to use readily available materials such as toothpicks to assemble a dummy of a single component or a component such as an IC without taking a time-consuming method. By using a continuous stopper that can be used as
Unused through holes can be reliably protected from solder infiltration with a simple operation. Furthermore, in the plug of the present invention, a plurality of handles connected to pins are integrally formed, and a cutting groove is formed between adjacent handles, so the plug can be separated into any number of pins and handles. Depending on the number and arrangement of through holes in the printed circuit board to be protected from solder infiltration, one pin or a plurality of pins and any pin can be used separately together with the handle.

In addition, since the capper of the present invention has a structure consisting only of a pin and a handle, there is no need for a holder to hold the handle or pin or a handle for operation, and the pin can be inserted by holding the handle. Since it can be inserted into and removed from the through hole, an extremely small plug can be obtained. Furthermore, since such a structure can be rolled up as a whole, it can be loaded into an automatic machine and processed automatically.

[Brief explanation of the drawing]

Figure 1 and the following diagrams explain an embodiment of the present invention. Figure 1 is a partially cutaway front view, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is used to explain how it is used. FIG. 1...Potter, 2...Pin part, 3...Handle part, 8...
…substrate.

Claims (1)

[Scope of utility model registration request] It consists of a pin part made of a material that does not adhere to solder, and a handle structure that fixes one end of the pin part. During soldering work, the pin part is inserted into a through hole in a printed circuit board, protecting the through hole from infiltration of solder. In a removable plug for a printed circuit board, a plurality of plug handles are integrally formed so that pin portions are arranged at predetermined intervals, a groove is provided between adjacent handles, and the plug is attached to the plug. A plug for a printed circuit board, characterized in that it can be separated into an arbitrary number of pin parts and a handle along a groove, and the plug has a structure consisting only of the pin part and the handle.