JPS624841B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrical component used in, for example, a variable resistor or a band switching switch.
A holder such as a cover that rotatably supports this,
It relates to electrical parts that are formed as a built-in device.

Recently, the demand for miniaturization of electrical components has permeated all fields, and tuning tuners incorporated in television sets and the like are no exception. However, this type of tuner requires multiple band switching switches and tuning variable resistors to be attached to a single frame, so miniaturizing each component causes the inconvenience of complicating assembly and manufacturing. As expected, parts management had to be extremely strict.

For this reason, as this type of electrical component, one that can be easily assembled and manufactured as shown in FIGS. 1 and 2, for example, has been proposed. That is, this electrical component consists of a holder 1 having a shaft hole 1a and a rotating body 2 that is non-removable and rotatably incorporated into the holder 1, and its molding method is as shown in FIG. The holder 1, which has a shaft hole 1a drilled in advance, is inserted into the first
and the second molding molds 3 and 4 are sandwiched and brought into close contact with each other, and a thermoplastic synthetic resin material is injected and filled into both the molding molds 3 and 4, and is cooled and hardened to form the rotating body 2. It was incorporated into the holder 1. Here, the rotating body 2 contracts during cooling and hardening, creating a gap between it and the holder 1, allowing it to rotate freely with respect to the holder 1 and to correspond to the shaft hole 1a inclined in a predetermined direction. The shaft portion 2a is slanted to prevent it from falling off. This reduces the need to form the holding body 1 and the rotating body 2 separately and then assembling the plurality of rotating bodies 2 into the holding body 1 one by one, thereby simplifying assembly and manufacturing.

However, even with this improved electrical component, the multiple rotating bodies 2 are structured to rotate in various directions after manufacturing, so when used for a band switching switch, for example, the operation part of the rotating body 2 is When fitting a knob (not shown) to the drive part 2b and a slider holder (not shown) to the drive part 2c, the knob or the slider holder should be made to correspond to the rotational position of each rotating body 2, Each of them had to be adjusted to a predetermined position, which was extremely troublesome and difficult to automate.

Therefore, an object of the present invention is to connect each rotating body to at least one of the adjacent rotating bodies with a connecting body that is disconnected when the rotating body is forcibly rotated. It is an object of the present invention to provide an electrical component that can temporarily fix a rotating body in a positioned state during assembly of a slider receiver, etc., to facilitate installation of a slider holder, etc., and can also be automated.

The present invention will be explained below based on the drawings.

3 to 6 are diagrams showing embodiments of the present invention.

First, the structure will be described. Reference numeral 10 in the figure is a holding body such as a stator portion or a frame body, and a plurality of rotary bodies 11 of, for example, a band changeover switch are incorporated into this holding body 10. This holding body 10
is molded from a thermoplastic synthetic resin such as polyethylene terephthalate, and has a stepped shaft hole 10a into which the rotating body 11 is installed, and an inclined portion 10b is formed at a reduced diameter portion of the shaft hole 10a. On the other hand, the rotating body 11 has an operating part 11b having a fitting part 11a into which a knob (not shown) is fitted, a fitting part 11c into which a slider receiver 26 (to be described later) is fitted, and a shaft hole 10a. A drive portion 11d with a larger diameter is connected to the drive portion 11d and the operating portion 11b, and the shaft hole 10
and a shaft portion 11e that engages with the shaft portion a.
This shaft portion 11e is inclined corresponding to the inclined portion 10b of the shaft hole 10a, and a slight gap is formed between the shaft portion 11e and the inclined portion 10b. The engagement between the shaft portion 11e and the inclined portion 10b of the shaft hole 10a prevents the rotating body 11 from falling off. A pair of adjacent rotating bodies 11 are positioned and connected by connecting bodies 12 that are easily disconnected by forced rotation of the rotating bodies 11, and a plurality of such sets are arranged. This connecting body 12 has a connecting part 12a that connects the pair of rotating bodies 11 via a cutting part 12c.
and a holding portion 12b that prevents the connecting portion 12a from falling off even if the connecting portion 12a is disconnected from the rotating body 11. The connecting portion 12a has thin and narrow cut portions 12c formed at both ends connected to the driving portion 11d of the rotating body 11 so as to be easily cut. It is embedded in a holding hole 10c inclined in the same direction as 10b. The connecting body 12 and the rotating body 11 are integrally molded from a thermoplastic synthetic resin such as polyacetal.

Further, in the electrical component shown in FIG. 5, the rotating body 31 is for example a variable resistor, and is assembled into the conical shaft hole 10d of the holder 10, and the two adjacent rotating bodies 31 are similar to those described above. They are connected by a connecting body 12. This rotary body 31 has a pointer 31a formed on the upper surface of the operating part 31b, a toothed part 31c formed on the peripheral surface, and a shaft part 31e interposed between the operating part 31b and the driving part 31d and a shaft hole 10d. It is correspondingly conically shaped.

Next, a method for molding an electrical component according to the present invention will be explained with reference to FIG.

First, a holder 10 made of a thermoplastic synthetic resin such as polyethylene terephthalate and having a plurality of shaft holes 10a and holding holes 10c is sandwiched between first and second molds 14 and 15 and brought into close contact with each other.
The first mold 14 is formed with a cavity 14a that forms the operating part 11b of the rotary body 11, and the second mold 15 is formed with a connecting part between the driving part 11d of the rotary body 11 and the connecting body 12. Cavities 15a and 15b forming the cavity 12a are formed.
Then, a thermoplastic synthetic resin material such as polyacetal is injected into the cavities 1 of both molds 14 and 15 through a gate (not shown) of the second mold 15.
4a, 15a, 15b and the shaft hole 1 of the holding body 10
0a and the holding hole 10c are filled, and the mixture is cooled and hardened.
In this case, it is particularly important to note that the holder 10 is molded and hardened prior to molding the rotating body 11, and that the materials used to mold these 10 and 11 are different synthetic resin materials, such as 1
The melting point of the material from which the rotating body 11 is molded is relatively higher than the melting point of the material from which the rotating body 11 is molded. Therefore, even when the rotating body 11 is molded, no integration phenomenon due to welding occurs at the interface between the two molding materials. Note that even if the same type of molding material is used, for example, if the surface of the holder 10 is made smooth,
The resin of the rotating body 11 can be prevented from being bitten into the boundary surface, and the rotating body 11 is rotatably supported by the holder 10. Due to the cooling and hardening, the thermoplastic synthetic resin contracts, and the shaft portion 11e of the rotating body 11
and the holding body 10 are slightly spaced apart, and the two adjacent rotating bodies 11 are positioned at a predetermined position by the connecting body 12 and are integrally molded.
An electrical component according to the present invention is formed by simultaneously molding a number of pairs of the connector 1 and the connector 12. Note that the rotating body 31 for the variable resistor is also formed in the same manner as described above.

An example in which the electrical component thus formed is implemented in a tuning block will be described with reference to FIGS. 7 to 9. FIG. 7 is a plan view of this tuning block. As shown in this figure, the rotating body 11 for band switching and the rotating body 31 for variable resistor are arranged in parallel, and these rotating bodies 11, 31 operation unit 1
1b, 31b are circular holes 16a, 1 of the insulating case 16
A single holder 1 rotatably protrudes from the insulating case 16 and fitted to the lower side of the insulating case 16.
0, respectively, and are positioned and assembled by connecting bodies 12. Further, a worm gear 17 for rotating a rotary body 31 for a variable resistor is protruded from a rectangular long hole 16c of the insulating case 16.
This worm gear 17, the rotating body 1 for band switching
1 and the rotating body 31 for the variable resistor constitute one set, and the plurality of sets are arranged in parallel in the longitudinal direction.
Furthermore, an insulating substrate 18 having terminals 21 and 22 held by a terminal holding portion 19 on its lower surface is attached to the lower side of the holding body 10 in the drawing. On the upper surface of this insulating substrate 18, contact circuits for band switching (not shown) corresponding to the rotating bodies 11 and 31 and a resistance circuit 23 of a variable resistor (see FIG. 9) are printed and formed. This resistance circuit 23
1 and 22, and a plurality of resistance circuits 23 are connected to each other by leads 24. A slider 25 having a contact piece 25a that comes into sliding contact with the resistance circuit 23 has a pair of engagement protrusions 26a and a holding portion 26.
b, and the slider receiver 26 and the slider 25 are rotatably caulked to the insulating substrate 18 through eyelets 27. The engaging protrusion 26a of the slider receiver 26 is fitted into the recessed fitting part 31f of the driving part 31d of the rotating body 31, and the band is also fitted into the fitting part 11c of the driving part 11d of the rotating body 11. A slider receiver associated with a switching contact circuit is fitted. Furthermore, a knob (not shown) is attached to the fitting part 11a of the operating part 11b of the rotary body 11 for band switching, and a tuning block is temporarily assembled, and by rotating the worm gear 17, the rotary body 31 is By rotating the knobs, the rotating bodies 11 are forcibly rotated to disconnect the connecting body 12 from the cutting part 12c,
Both rotating bodies 11, 31 are made rotatable and the tuning block is completely assembled.

Here, when fitting with the slider receiver 26 and when attaching the knob, since both the rotating bodies 11 and 31 are positioned at a predetermined position and temporarily fixed by the connecting body 12, the rotating bodies 11 and 31 are temporarily fixed. 31 are not at different rotational positions. Conventionally, the rotating body 2 is rotatable at the time it is assembled and formed, and the plurality of rotating bodies 2 are rotated to different positions. However, according to the present invention, if the slider receiver 26 and the knobs are set at predetermined positions using the connecting body 12, they can be fitted to a plurality of rotating bodies 11, 31 at the same time. Of course, automation is also possible. Also,
The connection body 12 that has been cut by the forced rotation is held at the connection part 1 by the holding part 12b embedded in the holding body 10.
2a is supported, so the connecting portion 12a will not be scattered, and of course there will be no adverse effects.

By rotating the worm gear 17 of the synchronization block assembled in this way, the rotating body 3
1 is rotated, and the slider receiver 2 is rotated by this rotating body 31.
6 is rotated, and the contact piece 25a connects to the resistance circuit 2.
3 to adjust the resistance value. Further, when the knob is rotated, the rotating body 11 is rotated and the band is switched.

Note that the electrical component according to the present invention is not limited to the tuning block of the above embodiment, and can of course be used for a variable resistor or a band switching switch alone, and the holder may be covered with an insulating cover. Needless to say, it can be implemented by replacing it with the rotating body 1 connected by the connecting body 12.
Of course, the number of 1 and 31 is not limited to two as in the above embodiment, but may be three, etc., and the range of application thereof is extremely wide.

As explained above, according to this invention,
By connecting at least two rotating bodies with a connecting body, multiple rotating bodies can be placed in a positioning state. For example, it is possible to automatically install slider receivers, etc. at once, and, for example, it is possible to automatically attach slider receivers, etc. This has the effect of making it easier to assemble the product.

[Brief explanation of the drawing]

Figures 1 and 2 show examples proposed before this invention. Figure 1 is a cross-sectional view of an electrical component, Figure 2 is a cross-sectional view showing a method of molding the electrical component, and Figure 3 is a cross-sectional view of the electrical component. ~Figure 6 shows an embodiment of the present invention, Figure 3 is a sectional view of an electrical component used in a band changeover switch, Figure 4 is a bottom view of the same electrical component, and Figure 5 is a variable resistor. 6 is a sectional view showing a method of forming the electrical component shown in FIG. 3, and FIGS. 7 to 9 show a tuning block using the electrical component according to the present invention. Figure 7 is a plan view of the tuning block, Figure 8 is a side view of the tuning block shown in Figure 7, and Figure 9 is a partial plan view of the variable resistor mounted on the insulating substrate of the tuning block. It is. 10...Holding body, 10a, 10d...Shaft hole, 1
1, 31...Rotating body, 11b, 31b...Operation unit, 11d, 31d...Drive unit, 11e, 31e
... shaft part, 12 ... connection body, 12a ... connection part,
12b...holding section, 12c...cutting section.

Claims (1)

[Scope of Claims] 1. A plurality of rotating bodies, each consisting of a shaft portion that engages with the shaft hole, and an operating portion and a driving portion that are integrally molded with the shaft portion, are non-removably assembled in a holder having a shaft hole. each rotating body is integrally connected to at least one of the adjacent rotating bodies by a connecting body, and the connecting body has a cutting portion that is easily cut when the rotating body is forcibly rotated. An electrical component characterized in that the rotating body is rotatable relative to the holding body when the cutting portion is cut. 2. The connecting body consists of a connecting part that connects the rotating bodies through the cutting part, and a holding part that is embedded in the holding body and does not allow the connecting part to fall off even if the connecting part is cut from the rotating body. An electrical component according to claim 1, characterized in that: