JPS6035206Y2 - screw type variable resistor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a screw type variable resistor, which has an electrode body interposed between the case bottom plate and the resistor, which reduces the size of the structure, simplifies the structure and assembly, and has sliding characteristics. The purpose is to provide a resistor that can improve the

As a conventional screw type variable resistor, there is one shown in FIG.

In the figure, reference numeral 1 denotes a resin case, and a resistor 2 of a predetermined length is attached to the bottom plate of the case by tightening input terminals 3□, 32, and a terminal fitting 4 is attached by tightening output terminal 33.

Reference numeral 5 denotes a metal threaded shaft having a threaded shaft portion 5a and a small diameter portion 5b, a knob 6 attached thereto, and inserted into the case from the side wall of the case 1 so that the small diameter portion 5b can be freely rotated from above to the metal fitting 4. is engaged with.

Reference numeral 7 denotes a sliding joint formed by bending a thin metal plate, which is inserted between the threaded portion 5a of the screw shaft 5 and the resistor 2 with spring properties.

Reference numeral 8 denotes a pointer driver made of resin, which is screwed into the screw shaft portion 5a within the case 1.

Reference numeral 9 denotes a cover plate, which has engaging parts (
(not shown).

Next, during operation, when the knob 6 is rotated in any direction, the sliding contact 7 and the driver 8 slide in the direction of arrow A or B in the figure, causing the input terminal 3. Alternatively, a voltage drop value proportional to the variable resistance value between the input terminal 31 or 3° of the resistor 2 and the sliding contact 7 is variably set between the input terminal 31 or 32 and the output terminal 33, respectively.

As the drive element 8 slides, a well-known pointer (not shown) fitted therein rotates to display the voltage drop value.

However, according to the above conventional example, the output terminal 33 is located outside the input terminals 31 and 3°, and the length of the case 1 is approximately the sum of the resistor 2 and the terminal fitting 4, which is relatively large. , there is a disadvantage that the configuration becomes large, and the terminal 3
Nos. 1 to 33 had the disadvantage of requiring tightening work, which increased the number of man-hours.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

2 and 3 are a perspective view and an exploded perspective view of one embodiment of the screw type variable resistor according to the present invention, and FIG. 4A,
B is a longitudinal side view of the above-mentioned resistor and a longitudinal arrow view along the line A-A, respectively.

As shown in FIGS. 2A and 4B, the casing 11 is shaped like a resin box and has recesses 11a and 11b formed on the top surface of the bottom plate and the outer surface of the rear side wall, respectively.

Reference numeral 12 denotes an electrode plate made of a thin metal plate, which is integrated with a flat plate part 12as, a semi-cylindrical electrode convex part 12b, and an output terminal 12c extending downward from this, and is mounted in the bottom plate concave part 11a of the case 11. The terminal 12c passes through the hole in the bottom plate and projects downward.

Reference numeral 13 denotes a resistor plate, which has a pair of electrode parts 13a at both ends, a resistor part 13b of a predetermined length in the center, and a cutout part 13c at the side.As shown in FIG. The electrode plate 12 is placed on the upper surface of the electrode plate 12 so that the electrode protrusion 12b is exposed through the notch 13c.

Subsequently, the resistor plate 13 has a pair of eyelet-shaped input terminals 14, each having an electrode portion 13a at both ends protruding downward from the case. ．． It is tightened by 14□ and fixed to the bottom plate of the case.

At this time, the flat plate portion 12a of the electrode plate 12 is pressed by the resistance plate 13 and is attached and fixed at the same time. Insulated.

Since the electrode plate 12 is integrated with the terminal 12c, its construction and assembly are simple, and the positioning of the electrode plate 12 can be performed with one touch.

Further, since the total length of the electrode convex portion 12b is set to be shorter than the total length of the resistive plate 13 and longer than the resistive portion 13b, the terminal 14. ．． When attaching the terminals 14□, there is no risk that the terminals 14□, 14□ will be shortened to the electrode convex portions 12b, the terminal attachment space can be widened, the terminal attachment work can be made easier, and the sliding contact 19 (to be described later) can be attached to the entire length of the resistor portion 13b. When sliding back and forth, the risk of the electrode coming off the convex portion 12b can be eliminated, and reliability can be improved.

15 is a screw shaft made of resin or metal, and has a knob portion 15a1.
The case 11 consists of a screw shaft portion 15b and a small diameter portion 15c.
After being inserted into the case 11 from the front side wall and passing through the threaded assembly 18 of the sliding body 17 described later, the small diameter portion 15c is locked in the recess 11b by the fork-shaped mounting bracket 16. , thereby rotatably supported.

At this time, the mounting bracket 16 (elastic locking member) is in pressure contact with the rear side wall of the case 11 due to the elastic force of the metal, so the screw shaft 15 has a flange-like protrusion of the knob 15a on the case 11, as shown in FIG. 4A. While in contact with the front side wall 11, it is biased toward the rear (in the direction of arrow E in the figure), and can be freely displaced in the axial direction by a minute amount due to the elastic force of the metal fitting 16.

Therefore, as will be described later, when the threaded assembly 18 reaches the sliding limit in the directions of arrows E and F and the threaded claw portion 18d slips over the thread of the threaded shaft portion 15c, the mounting bracket 16
This effectively absorbs the vibration of the screw shaft 15 and improves the characteristics and durability of the slide.

In addition, since the mounting bracket 16 does not have any terminals and does not serve as a current-carrying path, it can be easily assembled and disassembled, which is extremely advantageous in terms of assembly and handling. It has a large range and is convenient.

Reference numeral 17 denotes a sliding body, which is made up of a resin threaded body 18 and a sliding joint 19 integrally attached thereto.

As shown in FIG. 3, FIG. 4A, B, and FIG.
A pair of protrusions 18c on the lower surface and a pair of screw claws 1 on the rear surface.
8d are integrally formed, and the screw claw portion 18d is screwed into the screw shaft portion 15b of the screw shaft 15 inserted into the U-shaped hole 18a as shown in FIGS. 4A, B and 6. Ru.

As shown in FIGS. 3 and 4A and 4B, the sliding contact 19 is made by bending a thin spring metal plate having a square hole 19a to form a pair of contact portions 19b and 19c. is 3
It consists of a book contact branch 19d.

This sliding contact 19 is integrally attached to the screw body 18 by fitting a square hole 19a into a pair of convex portions 18c, and each contact portion 1
9b and 19c are in pressure contact with the resistive portion 13b of the resistive plate 13 and the electrode convex portion 12b of the electrode plate 12, respectively, to provide electrical continuity therebetween.

20 is a resin cover plate with a long groove 20a and l on both ends of the bottom surface.
A pair of engaging portions 20b are formed.

When this cover plate 20 is attached to the top surface of the case 11,
In each engaging portion 20b, the pair of retaining pawls 20C abuts the screw shaft portion 15b, is elastically displaced outward, and is returned to the rear after passing through the outermost diameter portion of the screw shaft portion 15b. and grasp the screw shaft portion 15b.

As a result, the cover plate 20 is attached and fixed to the case 11, and the pin portion 18b of the screw assembly 18
Insert and protrude upward.

In this way, the screw type variable resistor is completed.

According to the above configuration, the electrode plate 1 having the output terminal 12c
2 are interposed and stacked between the case bottom plate and the resistor plate 13, so the overall length of the case 11 is approximately the same as the length of the resistor plate 13 alone, making it possible to reduce the length dimension and downsize the configuration. The electrode plate 12 and its terminal 12c are particularly attached to the case 11.
There is no need for the process of attaching and fixing.

Furthermore, when the cover plate 20 is attached to the case 11, it is actually attached to the screw shaft 15 by a pair of retaining parts 20b.
There is no need to perform any processing on the case 11 for attaching the cover plate 20, so the structure of the case 11 is simple, and the pair of retaining portions 20b also function as a stopper for the screw assembly 18, as will be described later. The number of parts can be reduced without the need to provide a part of the stopper.

Furthermore, the cover plate 20 can be attached and removed with a single touch, reducing the number of assembly steps.

Next, the operation of the screw type variable resistor having the above configuration is further explained in the seventh section.
This will be explained using figures.

First, when the knob 15a of the screw shaft 15 is rotated in the direction of the arrow C or D in FIG. 2 and FIG. Slide in the forward or F direction.

Therefore, for example, when the input terminal 141 side is energized, the partial length dimension 1° of the resistance portion 13b between the terminals 141 and 120 is appropriately decreased or increased, respectively. ．． 1
A voltage drop value proportional to this is set between 2c.

Also, when the input terminal 14□ side is energized, the terminal 14
The partial length dimension 1° of the resistor plate 13 between the terminals 14□ and 120 is increased or decreased as appropriate, and a voltage drop value proportional to this is set between the terminals 14□ and 120.

Further, the sliding body 17 comes into contact with a pair of engaging portions 20b of the cover plate 20 at the sliding limit positions in the directions of arrows E and F, respectively, and is stopped.

Furthermore, in reality, since the pin portion 18b of the screw body 18 is fitted with an arcuate groove of a rotatable pointer (not shown), the pointer rotates as the sliding body 17 slides. The variable voltage drop value is displayed as appropriate.

Contrary to the above embodiment, the terminal 12c is used for input, the terminal 14,
It is also possible to use -14□ for output.

As mentioned above, according to the screw type variable resistor of the present invention,
An elastic locking member is disposed at the end of the screw shaft to force the screw shaft in the axial direction, so that when the contact reaches the end of the screw shaft, The contact slips over the screw thread, but the vibration, particularly in the axial direction, during this slip phenomenon is effectively absorbed and softened by the elastic deformation of the elastic locking member, making it difficult to cause fatigue deformation of the contact and improving the slide characteristics. In addition, since the terminal is provided on the electrode body, there is no need to provide any terminal on the elastic locking member, and all that is required is to bias the screw shaft. It is easy to assemble and disassemble, making it very convenient to assemble, and since the electrode body does not become a current-carrying path, the parts that are directly screwed onto the screw shaft may be insulators (with conductive contacts), which is within the design range (degree of freedom). The electrode body is large and convenient, and since the electrode body is positioned by inserting and projecting the terminal formed integrally into the hole in the case, the electrode body and terminal are integrated, reducing the number of parts and making assembly easier. In addition, by inserting the terminal into the hole in the case, the electrode body can be positioned vertically and horizontally with one touch, making assembly even easier. Because it is short, when attaching terminals to both ends of the resistor 2, there is no risk that the terminals will come into contact with the electrode body and cause a short circuit, which increases the terminal attachment space and simplifies the terminal attachment work. Since it is longer than the resistor part of the resistor part, even if the contact slides over the entire length of the resistor part, it will not come off the electrode part, improving reliability. Also, the terminal of the electrode body is located between the l pair of terminals for the resistor part. As a result, the overall length of the case is approximately the same as the length of the resistor and can be made small, so it has the advantage of being able to downsize the structure.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional side view of a conventional example of a screw type variable resistor, Figure 2
Figures 3 and 3 show one example of the screw-type variable resistor of the present invention, respectively.
A perspective view of the embodiment and an exploded perspective view thereof, FIGS. 4A and 4B are a longitudinal side view and a longitudinal sectional view taken along line A-A of the above resistor, respectively, and FIGS. 5 and 6 are respectively the above resistor. A partially assembled plan view of the device and a plan view with the cover plate removed, and FIG. 7 is a circuit diagram of the resistor. 1.11...Case, 2,13...Resistance plate, 31 to 33 12C9 41 14□...Terminal, 4゜16...Metal fitting, 5゜15...Screw shaft, 5a. 15b...Screw shaft, 7゜19...Sliding contact, 8...Pointer driver, 9゜20...Cover plate, 12... ... Electrode plate, 2a ... Flat plate part, 12b ... Electrode convex part, 3b ... Resistance part, 13c ... Notch part, 7 ・...Sliding body, 18...Screwed body, 18d...Screwed claw part, 19b. 9c...Contact part, 20...Cover plate.

Claims (1)

[Scope of utility model registration request] The case has a terminal mounting part at both ends of a resistor part of a predetermined length, and a pair of terminals for input and output are respectively mounted to each terminal mounting part, so that the case bottom plate is A resistor to be mounted and fixed, an electrode part insulated from the resistor on the bottom plate of the case and extending parallel to the resistor, and one of the other - terminals inserted and projected into a hole in the case. The electrode body has an integrated electrode body, a convex part, and a retaining part, and the convex part is in contact with the side wall of the case and extends above and parallel to the resistor and the electrode part. A screw shaft supported by a case, an elastic locking member that is engaged with a retaining portion of the screw shaft and urges the screw shaft in the axial direction to prevent removal and locking, and a screw shaft that is directly attached to the screw shaft or It consists of a contact that is indirectly screwed together and is arranged so as to make common contact with the resistor and the electrode part to conduct them, and is slidably displaced as the screw shaft rotates, and the electrode A screw type variable resistor in which the total length of the electrode portion of the body is shorter than the total length of the resistor and longer than the resistance portion of the resistor.