JPS62164Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an adapter for a potentiometer, and in particular an adapter for holding the potentiometer body so that adjustment can be made from the back side of the printed circuit board even after the potentiometer is mounted on the printed circuit board. Regarding.

As is well known, a potentiometer is constructed by forming an adjustment part on one side of the body and leading out lead wires from the other side. Conventionally, potentiometers have been adjusted mainly from the top or side. However, depending on the location where the potentiometer is used, after the potentiometer is mounted on a printed circuit board, adjustments may be made from the back of the printed circuit board.
There has been a demand for what is called reverse adjustment. In order to reverse adjust the potentiometer, an adapter must be used.

FIGS. 1A to 1C are illustrative views showing an example of a mounting structure of an adapter for making reverse adjustment of a conventional potentiometer possible. As shown in FIG. 1A, a potentiometer 1 is constructed by forming an adjusting section 2 on one side of a main body and leading out a plurality of lead wires 3 from the other side. In order to make such a potentiometer 1 reverse adjustable, the insulating tube 11 is inserted through the plurality of lead wires 3, and then the lead wires 3 are aligned with the side surface of the main body and the adjustment portion 2 is inserted.
Fold it to the side. At this time, the plurality of lead wires 3 are arranged as necessary for attachment to a printed circuit board (not shown).

After that, in order to fix the bent lead wire 3, as shown in FIG.
An outer peripheral tube 12 is placed around the side surface of the main body. A heat-shrinkable tube or the like is used as the outer peripheral tube 12. Therefore, the outer tube 1
2 is placed over the side surface of the main body of the potentiometer 1 and then heat treated to shrink. In this way, a side view of the potentiometer 1 using the outer circumferential tube 12 as an adapter, viewed from the adjustment section side, is shown in FIG. 1C.

However, the devices shown in FIGS. 1A to 1C have the following drawbacks. That is, if the case of the main body of potentiometer 1 is made of metal,
The lead wire and main body must be insulated,
Further, since heat treatment must be performed after the outer circumferential tube 12 is placed over the potentiometer body, manufacturing becomes difficult and expensive. Furthermore, since the lead wires are aligned with the side surface of the potentiometer body and then covered with the outer peripheral tube, it is difficult to set the lead wire arrangement (terminal pitch) with high precision.

FIGS. 2A to 2D are illustrative views showing other examples of adapters for enabling reverse adjustment of potentiometers. In particular, Figure 2A is a cross-sectional view of the
Figure B is a front view with the potentiometer installed, Figure 2C is a side view as seen from the lead wire side, and Figure 2C is a side view of the potentiometer installed.
Figure D shows a side view seen from the adjustment section side. In the figure, a conventional adapter 20 has an opening 21 formed on one side of a cylindrical shape, an opening 22 having a diameter smaller than the inner diameter of the opening 21 on the other side, and an opening 22 formed on the other side along the axial direction of the outer circumference. A groove 23 having a hook-shaped cross section is formed. Then, the lead wire 3 of the potentiometer 1 is inserted through the opening 22, and the main body of the potentiometer 1 is housed in the cylindrical portion. Lead wire 3 is in groove 23
, and taken out to the adjustment section 2 side. Thereafter, resin is injected into the groove 23 in which the lead wire 3 is accommodated in order to fix the lead wire 3.

However, the adapter 20 shown in FIGS. 2A to 2D requires injection of resin to fix the lead wires and heat treatment to harden the resin, which takes time to assemble. This has the disadvantage of being unsuitable for mass production and increasing costs.

Therefore, this invention provides an adapter for a potentiometer that has a simple structure, can be manufactured at low cost, is easy to install a potentiometer, and can position the lead wires with high precision. It is to be.

In summary, this invention is an adapter in which a groove is formed along the axial direction in the inner wall of a bottomed cylindrical adapter, and a potentiometer is press-fitted into the adapter.

Hereinafter, specific embodiments of this invention will be described with reference to the drawings.

FIGS. 3A to 3D are illustrative views of a potentiometer adapter according to an embodiment of this invention.
In particular, Fig. 3A is a sectional view seen from the front side, Fig. 3B is a left side view of Fig. 3A, Fig. 3C is a right side view of Fig. 3A, and Fig. 3D shows a state in which the lead wire is inserted into the groove. FIG. In the figure, the adapter 30 of this embodiment has a bottomed cylindrical shape with a cylindrical portion 31 having an opening on one side and a bottom portion 32 on the other side. This adapter 30 is made of an insulating material. A protrusion 33, which is an example of a spacing member, is formed approximately at the center of the bottom 32 to maintain the distance between the bottom 32 and the potentiometer to form a space when the potentiometer 1 is attached. . Furthermore, one or more heat radiation holes 34 are bored in the bottom portion 32 . By appropriately selecting the arrangement, this heat radiation hole 34 can also be used as an insertion hole for leading out the lead wire of the potentiometer 1 when the lead wire is used without being bent toward the adjustment section side. . A groove 35 is formed in the inner circumferential wall of the cylindrical portion 31 at a portion located on the outer circumferential circle rather than on the circumference of the inner circumferential wall surface.

The groove 35 is formed in a cylindrical hole having approximately the same diameter as the diameter of the lead wire 3 of the potentiometer 1, and a portion on the inner peripheral wall side of the cylindrical portion 31 is notched at intervals smaller than the diameter of the lead wire 3. , and is formed to widen at an obtuse angle from the tip of the notch. Therefore, between the inner wall surface of the cylindrical portion 31 and the groove 35,
A gap 36 is formed. In addition, in the illustration, the groove 35
Although the case where three stripes are formed is shown, the number may be changed as appropriate depending on the number of terminals of the potentiometer. Also, the pitch of the groove 35 is determined by the potentiometer 1.
It is only necessary to select the necessary arrangement when attaching to the printed circuit board. Furthermore, if necessary, holes for heat radiation may be bored in the outer circumferential surface of the cylindrical portion 31.

Next, the case where the potentiometer 1 is attached to the adapter 30 of this invention will be explained.

Figures 4A and 4B are potentiometer 1
FIG. 4A is an illustrative view showing a state in which it is installed in a reversely adjustable manner, and in particular, FIG. 4A is a sectional view of the front side thereof;
FIG. 4B shows a side view seen from the adjustment section side. When attaching the potentiometer 1 to the adapter 30, bend the lead wires 3 of the potentiometer 1 by 90 degrees as shown in FIGS. 5A and 5B, and attach the potentiometer 1 to the opening side of the adapter 30. put it on. Then, press fit jig 40 into potentiometer 1.
, and press-fit in the direction of the arrow using the press-fit jig 40.
This press-fitting jig 40 consists of a portion 41 that presses the potentiometer 1 and a portion 42 that presses the lead wire 3. The difference in length between parts 41 and 42 is due to the height of potentiometer 1 and protrusion 33 of adapter 30.
It is appropriate to select a value approximately equal to the value obtained by subtracting the length of the lead wire 3 from the value obtained by adding the height of . Using such a press-fitting jig 40, the potentiometer 1 is press-fitted into the cylindrical portion of the adapter 30, and the lead wire 3 is fitted into the groove 35. As a result, the lead wire 3 does not come into contact with the side surface of the main body of the potentiometer 1, and the groove 35 is kept in an electrically insulated state.
It will be stored in. Therefore, the adapter 30 of this embodiment has the advantage that the potentiometer 1 can be simply press-fitted, no thermal treatment is required, and it can be installed easily and quickly.

6A and 6B are illustrative views showing other examples in which the potentiometer 1 is mounted using the adapter 30 of this invention, in particular, FIG. 6A shows a sectional view seen from the front side, and FIG. The figure shows a side view seen from the adjustment section side. In Figures 6A and 6B,
The lead wire of the potentiometer 1 is inserted into the heat radiation hole 34 without being bent toward the adjustment section 2 side. In this way, the adapter 30 of this embodiment
can be used not only for reverse adjustment but also as an adapter for normal adjustment. In this case, although the lead wire 3 is not inserted into the groove 35, the groove 35 serves as a heat dissipation groove for the potentiometer 1.
The function is to release the heat generated by the controller to the adjustment section.

As described above, according to this invention, it can be manufactured with a simple structure and at low cost, it can be easily installed when holding the potentiometer so that it can be reversely adjusted, and the positioning of the lead wire can be performed with extremely high precision. It has unique effects such as not requiring heat treatment and being suitable for mass production.

[Brief explanation of the drawing]

FIGS. 1A to 1C and 2A to 2D are illustrative views showing an example of a conventional potentiometer adapter, which is the background of this invention.
FIGS. 3A to 3D are illustrative views of a potentiometer adapter according to an embodiment of this invention. FIGS. 4A and 4B are illustrative views of an example of a state in which a potentiometer is attached to the potentiometer adapter 30 of this invention. 5A and 5B are diagrams showing a state in which the potentiometer is press-fitted into the adapter 30 using a press-fitting jig.
FIG. 6A and FIG. 6B are illustrative views showing other examples in which a potentiometer is attached to the adapter 30. In the figure, 1 is a potentiometer, 2 is an adjustment part, 3 is a lead wire, 30 is an adapter, 31 is a cylindrical part, 32 is a bottom part, 33 is a projection part, 34 is a heat radiation hole,
35 indicates a groove.

Claims (1)

[Claims for Utility Model Registration] (1) An adapter for fitting and holding a main body of a potentiometer having an adjustment section formed on one side of the main body and a lead wire extending from the other side, the adapter The adapter is made of an insulating material and has a bottomed cylindrical shape with an opening on one side and a bottom on the other side, and the bottom portion of the bottomed cylindrical shape of the adapter is provided with a potentiometer lead. A spacing member is formed to form a space for lifting a part of the main body on the wire lead-out side from the bottom part, and a spacing member is formed on the inner wall of the cylindrical part of the adapter, and a spacer member is folded back along the side surface of the potentiometer main body. A groove is formed to guide the lead wire to the opening side with the lead wire inserted, so that when the lead wire of the potentiometer is aligned with the side of the main body and folded back toward the adjustment section side, the potentiometer can be inserted into the potentiometer. A potentiometer adapter characterized in that the main body is press-fitted into a bottomed cylindrical part. (2) The adapter for a potentiometer according to claim 1, wherein a heat radiation hole is formed in a bottom portion of the adapter. (3) A plurality of the heat radiation holes are formed in the bottom portion, and the plurality of heat radiation holes are used as insertion holes for the lead wires of the potentiometer when the lead wires are used without being folded back. , a potentiometer adapter according to claim (2) of the utility model registration. (4) The groove formed in the inner wall of the cylindrical part is formed so as to hold the lead wire of the potentiometer away from the side surface of the main body. An adapter for a potentiometer according to any one of paragraphs to (3).