JPS5840570Y2 - slide variable resistor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sliding variable resistor used in radios, televisions, etc., which uses an insulating plastic molded case that is favorable for electrical safety, is relatively sturdy, and is easy to manufacture and assemble. Also, it is equipped with a shield structure to prevent damage caused by foreign matter entering from the outside.

A conventional slide variable resistor is, for example, the Japanese Patent Publication No. 47293
Referring to No. 84, etc., as shown in FIG.
A sliding body lever 2d of a sliding body 2 having a slider 7 attached to its lower surface is protruded through the long groove 1d of a.

The upper surface of the sliding body 2 comes into sliding contact with the inner surface of the upper surface of the case via the leaf spring 8, sliding plate 9, etc.

Here, the slider 7 on the lower surface of the slider 2 is slidably engaged with the resistor 5 and conductor 6 fixed on the upper surface of the insulating substrate 4 fixed on the opening of the case 1, thereby forming a sliding variable resistor. ing.

It is not preferable to use the metal case 1 here from the viewpoint of electrical safety such as insulation, and the long groove 1d for the lever is
There were also problems with safety and performance deterioration due to the invasion of foreign objects.

As a countermeasure to the above, a slide variable resistor with an insulating molded case and a shield structure to prevent invasion by foreign objects has been developed.

As a first example, in US Pat. No. 3,678,824,
As shown in the second sectional view, the structure is such that a pair of vertically divided insulating molded cases 1' of the same type are fixed to each other at the side surfaces by snap-in or the like.

Here, as a measure to prevent foreign matter from entering from the groove for the lever 2'd of the sliding body 2', it engages with the slot hole 2'C in the sliding direction of the sliding body 2'.

An elastic shield band C' is provided.

As a second example, as shown in the cross-sectional view of FIG.
and Utility Model No. 52i4 by the present applicant, in which a stepped portion 1''C to prevent foreign matter from entering is provided in the lever groove 1''d of the molded case 1''.
Examples include No. 154.

As a third example, as partially shown in FIG.
A molded housing 1''' with a groove 1'''d for protection, and a shield plate 3 to prevent invasion of foreign objects on the case lid 3'' that closes the opening.
There are examples such as Utility Model Application Laid-open No. 52-53343 in which ``''C is provided.

Here, the first example is the simplest, but because the case is vertically divided, there is a problem with the rigidity in the lateral direction.

Another disadvantage is that it is difficult to make a screw hole for fixing on the vertical center of the top surface.

In the second example, the sliding lever is bent, which results in a lack of robustness, complexity, and large size.

In the third example, the resin molding and processing of the molded housing 1'' and the case lid part 3'' are complicated, and the joining method is also complicated using the upper and lower outer surfaces of the case.

For this reason, there are disadvantages in that the height is high, the processing of the parts is difficult, and the cost is high.

The purpose of this invention is to improve the drawbacks of the conventional examples described in 1 and 2.3 above, and to improve performance such as improving strength and rigidity, simplifying parts processing and assembly, downsizing, insulation, and measures against foreign object invasion. It is said that

In the present invention, when the insulation molded case of the slide variable resistor is divided into two parts so as to be complementary to each other in the vertical direction as in the first example, (1) both ends including the screw holes on the top surface of both ends are As far as possible, the main body base is short and thick and has an integral rectangular parallelepiped shape, and is not divided vertically on a single plane at the center of the long axis, which is the sliding direction of the sliding body, but is divided into L-shaped combinations.

(2) The sliding part at the center of the case, which corresponds to the length of the long groove 1d in which the sliding body slides and occupies most of the longitudinal axis, is divided almost vertically,
The extension part becomes the base of the main body where the short end of the case is thick.
Here, the molded cases have a complementary L-shaped molded case structure in which they are connected to each other in the direction of their long axes.

As described above, according to 1, it is possible to improve the rigidity of the case and provide a mounting screw hole at the end of the upper surface of the case.

According to (2), by using two complementary and identical resin mold case pieces 21 with a relatively simple structure, the mold case parts can be simplified, and the relatively high cost insulating case mold can be Since it is simplified and only one piece is required, the cost of molded case parts has been significantly reduced and the number of defects has been reduced.

Further, the molded case can be easily snap-in assembled inside the molded case in the longitudinal direction, and therefore the height of the molded case does not increase and assembly is easy.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1A is a side sectional view of a conventional sliding variable resistor, the opening is an explanatory diagram of the same slope, and Figures 2, 3, and 4 are the first diagram of a conventional shield structure with an insulating molded case to prevent foreign object invasion. ,
It is a figure which shows each 2nd and 3rd side.

5 to 9 show an embodiment of the present invention; FIG. 5 is an assembled sectional view thereof, FIG.

FIG. 7C shows a side view of the molded case piece, and this Y-
A Y-plane cross section is shown in FIG. 7A, and the opening in FIG. 7 is a front view.

FIG. 7 2 shows another embodiment of the shield plate section.

FIG. 7E shows a sectional view of an embodiment in which only the shield plate portion is of an asymmetric type.

FIG. 7 is a plan view of another embodiment in which only the shield plate portion is of an asymmetric type.

8 is a perspective view of the mold case 21a shown in FIG. 7e, and FIG. 9 is a perspective view of the sliding body 22.

A pair of complementary L-shaped mold case pieces 21 made of elastic insulating resin mold material are shown in FIG.
As shown in FIG. 8, a box-shaped molded case 30 is constructed by forming complementary types of the same type in the sliding direction and engaging, ultrasonic bonding, or snap-in coupling with each other in the longitudinal direction.

As shown in FIG. 5, the cross-sectional assembly view of the central portion of the slide variable resistor is substantially similar to the configuration of a conventional variable resistor.

To assemble the variable resistor, inside the molded case 30,
The sliding body 22 made of an insulating mold shown in FIG. 6A and FIG. 9 is inserted, and the bottom side protrusion 22p of the sliding body 22 engages and slides with the side groove 21p in the longitudinal direction at the center of the inner surface of the case. .

At the center of the main body inside the case of the sliding body 22, there is a long groove 21d corresponding to and wider than the width of the long groove 21d to prevent foreign matter from entering from the long groove 21d on the upper surface of the case 21a from which the operating lever 22d of the sliding body projects. A hole 22e in the sliding direction is provided to loosely pass through the shield plate 31C.

As shown in FIG.
The resistor 2 fixed on the resistor board 24 fixed to q
5. Sliding contact with the conductor 26 to make sliding electrical contact.

Furthermore, external terminals at both ends of the resistor 25 and external terminals of the conductor 26 are fixed to the substrate 24 .

As shown in FIGS. 5, 7, and 8, the upper surface of the mold case piece 21 has a long groove 21d that engages with the operating lever 22d provided on the upper part of the sliding body 22, and the lower surface thereof has a long groove 21d that engages with the operating lever 22d provided on the upper part of the sliding body 22.
It is provided with a groove 21 h that engages with the external terminal No. 4.

As shown in FIGS. 7 and 8, the mold case pieces 21 are complementary to each other in the longitudinal sliding direction, and a pair of mold case pieces 21 of the same shape are fixed in the sliding direction by snap-in or the like. A box-shaped assembly case 30 is constructed.

Then, as shown in Figure 7A, case 21 on the right side
From one side end of the main body base 21b, which is approximately equal in thickness and short in the longitudinal direction and thick in the width direction, a long side wall 21j half the thickness of the main body base 21b protrudes in the right angle direction. It is made of an elastic resin mold with the same shape.

At the tip of the protruding side wall part 21j, there is a snap-in elastic mounting claw 21e for fixing to the side wall in the longitudinal sliding direction on its extension part, and a fixing protrusion 21 is provided on the upper and lower case surfaces of the side wall part. f is provided.

On the other hand, on the inner surface in the longitudinal direction of the thick main body base 21b, there is an engaging portion as a retaining portion in the longitudinal sliding direction that engages with the elastic mounting claw 21e and the fixing protrusion 21f at the tip of the side wall portion. It has holes 21'e and 21'f.

In addition to the appropriate combinations mentioned above, the fixing protrusions may be a combination of heat or ultrasonic fixing protrusions and holes.

A shield plate 21C is integrally projected from the inside of the main body base 21b of the molded case piece 21 in parallel with the long wall 21j, and a complementary recess is provided inside the main body base 21b to engage with the end of the shield plate 21C. 21'C is provided.

At this time, (1) the case is of the same complementary type including the shield plate 21 C part;

la) Here, the shield plate portion may be divided into left and right parts along the center line, and the cross section of the shield plate portion may be divided into 31C shown in FIG. 7-2.

Here, a minute gap remains in the center.

lb) As a shield plate part that does not leave a gap in the center, it is also possible to use 21C with mutually overlapping parts 21g as shown in Figure 7A and 9C, but the shape is somewhat complicated and machining is difficult. It's a hassle.

(2) Only the shield plate part of the case 21 is of an asymmetric type, and the shield plate 41 is attached to one side of the case as shown in FIG.
C, and the other case is provided with an engagement recess for the shield plate.

Although it is easy to manufacture, it requires a pair of complementary molded cases 21 and 210 (not shown).

Here, a rib portion 51 as shown in FIG. 7 is provided at the center of the cross section of the shield plate C including 1) and 2) to increase bending rigidity, and the rib portion 51 as shown in FIG. 22 shield plate hole 22C and case shield plate engagement recess 21
'C improves the strength of the shield plate 21C.

Here, the assembly joint portion of the case, the elastic attachment claw 21e, the fixing protrusion 21f, and the shield plate portion 21C may be made asymmetrical if necessary.

In the present invention, as shown in Figure 7, A9, C, and II, by using two complementary and identical resin mold case pieces 21 with a relatively simple structure, it is possible to simplify the mold case parts. Since the comparatively expensive insulating case mold is simplified and only one piece is required, the cost of the molded case parts is greatly reduced and the number of defects is reduced.

In addition, the mold case pieces 21 are two identical mold case pieces 21 in the complementary isomorphic type, and the seventh mold case piece 21 in the complementary asymmetric type.
As shown in Figure 8, there are two mold case pieces.
1, 210 (not shown) is used.

Further, the molded case pieces can be easily assembled by snap-in in the longitudinal direction inside the molded case, and therefore the height of the molded case does not increase and assembly is easy.

The present invention uses an insulating molded case, which is preferable for electrical safety, and has screw holes integrated on the top of the case, similar to conventional products, to increase the rigidity of the case and provide a durable sliding variable resistor that is easy to assemble. This has great practical effects.

[Brief explanation of the drawing]

Figure 1A is a side sectional view of a conventional sliding variable resistor, the opening is an explanatory diagram of the same slope, and Figures 2, 3, and 4 are the first diagram of a conventional shield structure with an insulating molded case to prevent foreign object invasion. ．．
Second. The third example, FIGS. 5 to 9 show embodiments of the present invention,
Fig. 5 is an assembled cross-sectional view, Fig. 6 A is a sliding body, the mouth is a resistor substrate, C is a slider, and Fig. 7 C is a side view of a molded case. As shown in Figure 7 A,
The illustration is a front view. FIG. 7 2 shows another embodiment of the shield plate section. The seventh figure shows a sectional view of an embodiment in which only the shield plate portion is of an asymmetric type. FIG. 7 is a plan view of another embodiment in which only the shield plate portion is of an asymmetric type. 8 is a perspective view of the mold case 21a shown in FIG. 7, and FIG. 9 is a perspective view of the sliding body 22. 21: Mold case, 21b: Main body base, 21c: Shield plate, 21'C: Shield plate engaging recess, 21d: Long groove on upper surface of mold case, 21e: Elastic mounting claw, 21'
e: engaging hole, 21f: fixing projection, 21'f: engaging hole, 21j: long side wall, 22: sliding body, 22c: engaging hole, 22d: sliding body lever, 24: insulating substrate, 25: resistor body, 26: conductor, 27: slider, 28: plate spring, 29
: sliding plate, 30: molded case, 41C: shield plate protrusion, 51: shield plate rib part.

Claims (1)

[Scope of utility model registration request] A pair of complementary L-shaped insulating molded case pieces 21 having the same shape and having one side wall 21j having a long half-thickness protruded from a rectangular main body base 21b having a short length axis direction. A long groove 21 d is provided on the upper surface in the longitudinal direction of the box-shaped case 30 which is inserted and inserted into each other in the longitudinal direction, and a groove 21 q parallel to the upper surface provided on the lower part of the inner surface of the side wall is provided in the lower inner surface of the molded case 30. A sliding body 22 made of an insulating material is equipped with a slider 27 attached to the lower side, which is in sliding contact with a resistor 25 and a conductor 26 fixed to the upper surface of an attached insulating substrate 24.
The lever 22d is made to protrude upward, and the molded case piece 2
An elastic fixing claw 21 e and a fixing protrusion 21 f are provided on the extension of the tip of the long one side wall 21 j of 1, and these are inserted into the longitudinal engagement holes 21 ′ e and 21 ′ of the main body base 21 b.
f, respectively, and are fixed to each other, and from the inside of the main body base 21b of the mold case piece 21, the long wall 21
The shield plate protrusion 21C is integrally protruded parallel to the shield plate protrusion 21C, and a complementary recess 21'C is provided inside the main body base 21b to engage with the end 1 of the shield plate protrusion 21C. 21C into the longitudinal engagement hole 22c of the sliding body 22, and
A slide variable resistor configured to prevent foreign matter from being inserted from d.