JPH0745922Y2 - Sliding variable resistor - Google Patents

Description

[Detailed description of the device]

[0010]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor, and more particularly to a sliding type variable resistor configured to change a resistance value by sliding a slide block in a case.

[0011]

2. Description of the Related Art In a conventionally known sliding variable resistor, a slide block is slidably accommodated in a case and a slider mounted on the lower surface of the slide block contacts an element surface mounted on the bottom surface of the case. The resistance value is increased or decreased by moving to the left or right.

The variable resistor having such a structure ensures that the slider and the element always slide while contacting with each other at a constant pressure (a so-called "taste" is produced when the slide block is operated). Therefore, a space spring is attached to the upper surface of the slide block, and the space spring is brought into contact with the surface of the torque plate attached to the back side of the case top plate.

[0013]

However, in the case of such a structure, since the torque plate and the space spring are mounted on the upper surface of the slide block, the number of components is increased as a whole, and the assembling work becomes complicated, resulting in a high cost. There was a drawback to invite.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and has a conventional structure in which the case itself for accommodating the slide block has the functions of a space spring and a torque plate. It is an object of the present invention to provide a variable resistor capable of eliminating many drawbacks.

Another object of the present invention is to provide a sliding type variable resistor having a reduced number of parts to be assembled, a simple assembling means, and a reduction in manufacturing cost as a whole. Is.

[0016]

The present invention has a tunnel-shaped case body whose both ends and a bottom surface are open, and an inverted U-shaped base for closing both end surfaces and a bottom surface which are open surfaces of the case body.
A variable resistor that is mounted on the slide block that slides in the case body and on the top surface of the bottom plate of the base, and that allows the slider mounted on the bottom surface of the slide block to resiliently contact the resistor formed on the top surface of the substrate. In the container, the case body is elastically continuous with pressing plates formed by using a hard synthetic resin and formed by inclining like roofs at the upper ends of the two facing side walls, and A slight gap is formed between the tip portions, and a click stop for fitting the tip of a rod-shaped contact rod that is erected in an eight-shape at the upper end of the slide block in the center of one pressing plate. With a structure with holes
The slide block that slides in the case main body has a plate-shaped operation knob raised in the center of the upper surface of the block main body, and rod-shaped contact rods are provided on both sides of the operation knob, and the pressing plate of the case main body is attached from the lower surface. It has a structure in which it is erected as a length that pushes up slightly, and several sliders are elastically attached to the lower surface of the block body, and the operation knob protruding from the upper surface of the slide block has the tip of two pressing plates. The gist of the invention is a structure of a sliding type variable resistor configured to project from a gap portion formed between the parts.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

The sliding variable resistor according to the present invention comprises a case body 1, a slide block 2 which freely slides in the case body 1, both side end surfaces and a lower surface of the case body 1, and an element 3 on the bottom surface. It is configured by a combination of bases 4 that can accommodate the.

The case main body 1 is made of a hard synthetic resin, and the pressing plates 12, 12 inclined like a roof are integrally formed on the upper ends of both side walls 11, 11 having a constant height. By making it continuous, both end faces and the bottom face are formed in a tunnel shape.

The pressing plates 12, 12 which are respectively continuous with the upper ends of the two side walls 11, 11 face each other so that a slight gap can be formed so that the tips do not contact each other. An operation knob 22 in which a gap portion where the tips of 12 face each other protrudes from the upper end of the slide block 2
Sliding groove 13 and inclined pressing plates 12, 12
Has downward elasticity.

As illustrated in FIGS. 3 to 5, a pressing plate
The wall thickness of 12 is formed such that the wall thickness gradually decreases from the side in contact with the upper end of the side wall 11 toward the front end, thereby increasing the elasticity (downward force) of the pressing plate 12.

Although not particularly shown, the side wall
The downward elasticity of the pressing plates 12, 12 can be further enhanced by forming the inner wall thickness of the boundary between the pressing plate 12 and the pressing plate 12 to be slightly thinner along the length direction.

Stoppers 14 and 14 for restricting the overrun of the operation knob 22 are formed at one ends of the pressing plates 12 and 12, respectively. It is blocked.

Numeral 15 is a click-stop hole formed in the central portion of the one pressing plate 12, and the tip end portion of the abutting rod 23 protruding radially outwardly above the slide block 2 is fitted therein. As a result, the slide block 2 can be accurately stopped at a fixed position. (See Figure 3)

Reference numerals 16 and 16 denote bottom frames for connecting the lower end portions of the two facing side walls 11 and 11, respectively, and restrict the side walls 11 and 11 from spreading outward.

Reference numerals 17 ... 17 are support claws formed in L-shaped cross sections at the lower end portions of the side walls 11, 11, and are fitted to fitting portions 41 ... 41 formed on the side surface of the base 4, and the base 4 is fixed. The bottom plate 42 is supported from the lower surface.

Numerals 18 ... 18 are leg pieces for mounting which are provided on the lower surfaces of the end portions of the side walls 11, 11 and which are fitted into fitting holes formed in a printed circuit board (not shown) on which a large number of variable resistors are mounted. It is for stopping, and the leg pieces 18 ... Protruding on the back surface of the printed circuit board (not shown) are melt pressure biased and integrated with the substrate.

The base 4 is made of a hard synthetic resin of the same quality as that of the case body 1 and is formed into an inverted U-shape. The bottom plate 41 is formed to have a shape matching the bottom shape of the case body 1.
Standing walls 42, 42 standing from both sides of the bottom plate 41 are matched with the end surface shape of the case body 1.

Reference numerals 43 and 43 denote fitting insertion grooves formed at the inner lower ends of the upstanding walls 42 and 42 for fitting both ends of the element 3 therein.

Reference numerals 44 ... 44 are fitting protrusions for integrating the case body 1 and the base 4, and are configured to be fitted in the fitting grooves 19 ... 19 formed in the case body 1.

It is desirable that the fitting protrusions 44 ... 44 and the fitting grooves 19 ... 19 are formed in a "ditch groove" shape which is a known fitting structure so as not to be easily separated from each other when they are fitted to each other.

The fitting protrusion formed at the portion where the pressing plates 12 and 12 and the standing walls 42 and 42 are locked is slightly thinner than the height of the fitting grooves 19 and 19 formed in the pressing plates 12 and 12. It is formed so as not to lose the elasticity of the pressing plates 12 and 12.

The element 3 is a known element, and a resistor 32 for adjusting the resistance value by bringing the sliders 24 ... 24 of the slide block 2 into contact with the surface of the substrate 31 having an insulating property.
32 is printed and electrically drawn out from both ends thereof through the through holes (not shown) to the back side, and the drawn out ends are attached to the attachment portions of the terminal plate (not shown) attached to the bottom plate 41 surface. Configured to do so.

The slide block 2 is a plate-like operation knob at the center of the upper end of the block body 21 that slides in the case body 1.
22 is erected and a plurality of sliders 24 ... 24 are elastically attached to the back surface.

Reference numeral 23 denotes a bar-shaped contact rod that is erected in an inverted octagonal shape in the center of the upper surface of the block body 21, and the lower end of the pressing plates 12, 12 whose top end is formed like a roof on the upper end of the case body 1. The length is set so that the pressing plates 12, 12 are brought into contact with and push up a minute distance.

The lower surface of the slide block 2 in the width direction is supported on the support step portions 1a, 1a formed on the inner lower portions of the side walls 11, 11 of the case body 1 so that the slide block 2 does not descend excessively. I have to.

[0037]

The effects of the present invention constructed as described above are as follows.

(1) Rod-shaped abutting rods 23, 23 are formed upright in an inverted eight-shape on the upper part of the slide block 2.
The pressing plates 12 are slightly pushed up while contacting the lower surfaces of the pressing plates 12, 12 formed by inclining the tip ends of the 3, 23 to the roof-shaped continuous formation on the upper end of the side wall 11 of the case body 1. , A pressing plate for pushing up the contact rod 23
Due to the repulsive force of 12, the slide block 2 is constantly subjected to a constant pressing force, and despite the fact that the space spring and torque plate, which were always used in the conventional structure, are omitted, they have the same or better effect. Can be demonstrated.

(2) Since the click stop hole 15 is formed at the center of the locus along which the contact rod 23 of the one pressing plate 12 slides, if the operation knob 22 is slid to the center position. It becomes possible to stop the slide block 2 at a certain position without fail. Especially, the present invention uses the contact rod 23 for pressing the slide block 2 as a structure for the click stop. Since the tip end of the rod 23 is configured to exert its effect by being fitted into the click stop hole 15, there is a feature that the effect can be exerted without adding a special structure again. .

(3) Compared with the conventional variable resistor, the number of parts used can be extremely reduced, the assembly work can be simplified, and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a variable resistor.

FIG. 2 is a front view of a variable resistor.

FIG. 3 is a central cross-sectional view of FIG.

FIG. 4 is an exploded perspective view of components excluding a slide block.

FIG. 5 is a perspective view of the case body as seen from the bottom surface.

[Explanation of symbols]

 1 Case Main Body 11 Side Wall 12 Holding Plate 13 Sliding Groove 1a Slide Block Bearing Step 14 Stopper 15 Click Stop Hole 16 Bottom Frame 2 Slide Block 21 Block Main Body 22 Operation Knob 23 Contact Rod 24 Slider 3 Element 31 Substrate 32 Resistor 4 Base 41 Bottom plate 42 Standing wall 43 Element fitting groove

Claims (2)

[Scope of utility model registration request] 1. A tunnel-shaped case body whose both ends and a bottom surface are opened, an inverted U-shaped base for closing both end surfaces and a lower surface which are open surfaces of the case body, and sliding inside the case body. A variable resistor that is mounted on the moving slide block and the bottom plate of the base, and that allows the slider mounted on the bottom surface of the slide block to resiliently contact the resistor formed on the top surface of the substrate. Is made of a hard synthetic resin, and the pressing plates formed by inclining like roofs at the upper ends of the two facing side walls are elastically continuous, and the tip parts of the two facing pressing plates are placed between each other. A slight gap is formed in the bottom of the slide plate, and a click stop hole for fitting the tip of a rod-shaped contact rod that stands up in an eight shape at the upper end of the slide block in the center of one pressing plate. The slide block, which has a perforated structure and slides in the case main body, has a plate-like operation knob standing upright at the center of the upper surface of the block main body, and bar-shaped contact rods on both sides of the operation knob. The pressing plate of the block is set up so that it is pushed up slightly from the bottom surface, and the bottom surface of the block body has a structure in which several sliders are elastically attached, and the operation knob protruding from the top surface of the slide block A sliding type variable resistor configured to project from a gap formed between the front end portions of two pressing plates. 2. A structure in which a case body formed in a tunnel shape and a base for closing the open surface are integrated by a fitting projection and a fitting groove, and the case body is formed at an end portion of a roof-shaped pressing plate. 2. The variable resistor according to claim 1, wherein the fitting groove is formed to be slightly deeper than the thickness of the fitting projection provided on the upper end of the base.