Miniature potentiometer structure

Abstract

The utility model provides a miniature potentiometer structure which comprises a plastic integrally-formed shaft handle, and the shaft handle is coaxially and sequentially provided with a rotating handle section, a rotating disc part and a flat shaft section. A limiting block is arranged on the top surface of the turntable part, and an elastic sheet is mounted on the bottom surface of the turntable part and is provided with a salient point part; a first sinking cavity is formed in the bottom surface of the shaft sleeve, and a stop block for limiting the rotation angle of the shaft handle protrudes from the inner wall; the metal first partition plate is fixed on the bottom surface of the shaft sleeve, and a plurality of grooves are distributed around the circumference; the bases are fixed to the bottoms of the first partition plates, second sinking cavities are formed in the top faces of the bases, and resistor bodies are arranged on the inner bottom faces of the second sinking cavities; and the electric brush assembly is arranged in the second sinking cavity. The first partition plate is arranged, the protruding point part is matched with the groove to form rotating hand feeling, even if the size of the potentiometer is small, abrasion is avoided, and the clear rotating hand feeling can be kept for a long time; and when the potentiometer is expanded to be duplex or more, only the same structure needs to be superposed, so that the mold cost and the equipment cost of product production can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of potentiometers, in particular to a structure of a miniature potentiometer. Background Art

[0002] Most traditional rotary potentiometers are general-purpose products with relatively mature technologies. However, with the upgrading and changes of various electronic products, the requirements for potentiometers are more refined and tend to be customized. For example, in some electronic products, it is required that the rotary potentiometer is small enough to meet the needs of product miniaturization, and at the same time, the potentiometer has a clear rotation feel, and the product cost is low enough. However, the existing potentiometer structures are difficult to meet the above requirements at the same time. For example, the Chinese utility model patent with the authorization announcement number CN208489066U discloses a sealed plastic rotary potentiometer, the structure of which includes a plastic bushing and a shaft core, a reed, and a brush assembly; a radial disk is provided in the middle of the shaft core, the upper end of the shaft core passes through the bushing, and the radial disk is located in the closed cavity formed by the bushing and the brush assembly. The reed is curved and clamped between the radial disk and the inner bottom of the bushing. The inner bottom of the bushing or the top surface of the radial disk has circumferential wave teeth, and the reed has contacts that cooperate with the wave teeth in a fluctuating manner, and a rotating fluctuation structure is formed between the reed and the bushing and the radial disk. If this potentiometer structure is applied, the following problems exist: 1. Since the wave teeth are formed on the plastic bushing, when the volume of the potentiometer is small enough, the plastic wave teeth are easily worn, which will cause the rotation feel to gradually become worse or even disappear, and the shaft core is easily axially loosened after wear, which will affect the stability of the potentiometer performance; 2. The stop protrusions that limit the rotation angle of the shaft core are formed in the second annular sink on the top of the carbon piece base, and two groups of brushes share a brush holder. The structures of the carbon piece bases are different, and the installation method of the brushes is unique, making it difficult to expand to potentiometers with three or more poles, increasing the mold cost, and making the structure of the automatic assembly equipment complex, which is not conducive to reducing the production cost of the product. Therefore, it is necessary to improve the existing potentiometer structure. Summary of the Utility Model

[0003] The purpose of the utility model is to improve the existing potentiometer structure to meet the customized requirements of miniaturization, clear feel and low cost.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A micro potentiometer structure includes a shaft handle, which is a plastic one-piece molded component and includes a rotating handle section, a turntable portion with a diameter larger than that of the rotating handle section, and a flat shaft section with a diameter smaller than that of the turntable portion, which are arranged coaxially in sequence; a limiting block protrudes radially on the top surface of the turntable portion, and a metal elastic piece is installed on the bottom surface of the turntable portion, and the elastic piece has a convex point portion protruding downward; a shaft sleeve for the shaft handle section to pass through, and the bottom surface has a first sunken cavity for receiving the turntable portion, and a stop block for restricting the rotation angle of the shaft handle by the limiting block protrudes from the inner wall of the first sunken cavity; a metal first partition plate is fixedly attached to the bottom surface of the shaft sleeve, and the first partition plate has a plurality of grooves distributed around the circumference and in contact with the convex point portion, and a first central hole for the flat shaft section to pass through; at least one group of bases is fixed to the bottom of the first partition plate, a second sunken cavity is recessed on the top surface of the base, and a resistor body is fixedly arranged on the inner bottom surface of the second sunken cavity; and a brush assembly is arranged in the second sunken cavity, including a brush holder adaptively sleeved on the flat shaft section, and a brush claw fixed to the bottom surface of the brush holder and in contact with the resistor body.

[0006] A preferred solution is that the groove is a rectangular through hole penetrating the first partition plate, and each of the through holes is radially distributed around the center on the first partition plate, and the convex point portion is a long strip adapted to the groove, and the cross section of the convex point portion is an arc concave downward.

[0007] A preferred solution is that a metal second partition plate is attached to the bottom surface of the first partition plate, and the second partition plate has a second central hole for the flat shaft section to pass through.

[0008] A preferred solution is that the elastic piece is integrally in a circular ring shape, one side of it is bent downward to form an inclined surface, the convex point portion is formed by stamping at the lowest point of the inclined surface, and the other side of the elastic piece is fixedly attached to the bottom surface of the turntable portion.

[0009] A preferred solution is that when there are no less than two groups of bases, each of the bases is stacked in sequence, and the second sunken cavity has a third central hole for the flat shaft section to pass through.

[0010] A preferred solution is that a plurality of positioning columns protrude vertically from the top surface of each of the bases, and a first positioning hole adapted to the position of the positioning column is provided on the bottom surface.

[0011] A preferred solution is that the resistor body is electrically connected to three pins radially passing through the base, a strip-shaped positioning groove is provided on the top surface of each of the bases corresponding to one side of the pin, and a strip-shaped positioning block adapted to the contour of the positioning groove protrudes from the position of the bottom surface of the base corresponding to the positioning groove.

[0012] A preferred solution is that both the first partition plate and the second partition plate have through holes for the positioning posts to pass through, and the bottom surface of the bushing has second positioning holes adapted to the positioning posts.

[0013] A preferred solution is that between each of the bases, the first partition plate, the second partition plate, and the bushing, two rivets at diagonal positions are axially inserted and fixed.

[0014] A preferred solution is that the bushing is a plastic component.

[0015] The beneficial effects of the present utility model are as follows: The shaft handle is a plastic integrally formed component. Compared with a metal shaft handle, the structure and assembly are simplified, and the product cost can be reduced; a metal first partition plate is provided, and grooves are circumferentially arranged on the first partition plate and cooperate with the convex point parts of the metal elastic pieces to form a rotation feel. Even if the potentiometer is small in volume, the metal first partition plate will not be worn, and a clear rotation feel can be maintained for a long time. At the same time, a second sunken cavity is provided on the top surface of the base, the brush assembly is arranged in the second sunken cavity, and the top surface of the base is partitioned by the first partition plate. When the potentiometer is extended to a double-link or above, the consistency of the structure and installation of the base and the brush assembly can be maintained, and only the same structure needs to be stacked, thereby reducing the mold cost and equipment cost of product production. Description of the Drawings

[0016] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0017] Figure 1 It is a schematic exploded view of the parts of the potentiometer in the embodiment;

[0018] Figure 2 It is a schematic exploded view of the parts of the upper part of the potentiometer in the embodiment;

[0019] Figure 3 It is a schematic exploded view of the base and the brush assembly in the embodiment Figure 1 ;

[0020] Figure 4 It is a schematic exploded view of the base and the brush assembly in the embodiment Figure 2 ;

[0021] Figure 5 It is a schematic cross-sectional view of the potentiometer in the embodiment. Detailed Embodiments

[0022] The following further describes the present utility model with reference to the drawings:

[0023] The embodiments described with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as limiting the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. In addition, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected", "fixed" should be understood in a broad sense, and for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] Referring to Figures 1 to 5 As shown, this embodiment is described by taking a dual micro potentiometer structure as an example. The potentiometer includes: a shaft handle 1, which is a plastic integrally formed member, including a rotating handle section 11, a turntable portion 12 with a diameter larger than that of the rotating handle section 11, and a flat shaft section 13 with a diameter smaller than that of the turntable portion 12, which are arranged coaxially in sequence; a limiting block 121 protrudes radially from the top surface of the turntable portion 12, and a metal elastic sheet 2 is installed on the bottom surface of the turntable portion 12, and the elastic sheet 2 has a protruding point portion 21 protruding downward; a shaft sleeve 3 for the shaft handle 1 section to pass through, and the bottom surface has a first sinking cavity 31 for receiving the turntable portion 12, and a stop block 32 for restricting the rotation angle of the shaft handle 1 by the limiting block 121 protrudes from the inner wall of the first sinking cavity 31; a metal first partition plate 4 is fixedly attached to the bottom surface of the shaft sleeve 3, and the first partition plate 4 has a plurality of grooves 41 distributed around the circumference and in contact with the protruding point portion 21, and a first central hole 42 for the flat shaft section 13 to pass through; two sets of stacked bases 5 are fixed to the bottom of the first partition plate 4, and a second sinking cavity 51 is recessed in the top surface of each base 5, and a resistor body 52 is fixedly provided on the inner bottom surface of the second sinking cavity 51; and a brush assembly 6 with the same number as the base 5 is arranged in the second sinking cavity 51, and the brush assembly 6 includes a brush holder 61 adaptively sleeved on the flat shaft section 13, and a brush claw 62 fixed to the bottom surface of the brush holder 61 and in contact with the resistor body 52.

[0025] When the rotating handle rotates, it drives the elastic piece 2 and two groups of brush assemblies 6 to rotate synchronously. The convex point portion 21 of the elastic piece 2 sequentially passes through the respective grooves 41 of the partition plate, so as to form a fluctuating hand feeling during rotation. The brush contacts the resistor body 52 to adjust the resistance value, and the stop block 32 limits the forward and reverse rotation angles of the shaft handle 1 through the limit block 121. The shaft handle 1 is a plastic integrally formed member. Compared with a metal shaft handle 1, the structure and assembly are simplified, and the product cost can be reduced; a metal first partition plate 4 is provided, and grooves 41 are arranged around the first partition plate 4 and cooperate with the convex point portion 21 of the metal elastic piece 2 to form a rotation hand feeling. Even if the potentiometer has a small volume, the metal first partition plate 4 will not be worn and can maintain a clear rotation hand feeling for a long time. At the same time, a second sunken cavity 51 is provided on the top surface of the base 5, the brush assembly 6 is arranged in the second sunken cavity 51, and the top surface of the base 5 is partitioned by the first partition plate 4, so that when the potentiometer is extended to a double connection or above, the structure and installation of the base 5 and the brush assembly 6 can be kept consistent, and only the same structure needs to be stacked, thereby reducing the mold cost and equipment cost of product production.

[0026] In a preferred solution, the groove 41 in this embodiment is a rectangular through hole penetrating the first partition plate 4, and the through holes are radially distributed around the center of the first partition plate 4. The convex point portion 21 is a long strip adapted to the groove 41, and the cross section of the convex point portion 21 is an arc concave downward. The groove 41 being a through hole can make the convex point portion 21 completely fall into the groove 41, enhancing the clarity of the rotation hand feeling. The cross section of the convex point portion 21 being arc-shaped reduces the resistance when the convex point portion 21 slides between the grooves 41 and avoids the rotation hand feeling from being jerky.

[0027] In a preferred solution, a metal second partition plate 7 is attached to the bottom surface of the first partition plate 4 in this embodiment, and the second partition plate 7 has a second central hole 71 for the flat shaft section 13 to pass through. The second partition plate 7 can, on the one hand, increase the strength of the first partition plate 4, prevent the first partition plate 4 from being sunken and deformed downward, thereby affecting the rotation hand feeling and the structural stability. On the other hand, it can also prevent the convex point portion 21 from contacting and rubbing against the brush holder 61 in the base 5 after completely falling into the groove 41.

[0028] In a preferred solution, the elastic piece 2 in this embodiment is integrally in a circular ring sheet shape, one side of which is bent downward to form an inclined surface 22, the convex point portion 21 is formed by stamping at the lowest point of the inclined surface 22, and the other side of the elastic piece 2 is attached and fixed to the bottom surface of the turntable portion 12. Compared with the curved spring piece in the prior art, the elastic piece 2 with this structure has stronger elasticity and reliability in a small volume.

[0029] A preferred solution. In this embodiment, when there are no less than two sets of the bases 5, the bases 5 are stacked in sequence, and the second cavity 51 has a third central hole 53 for the flat shaft section 13 to pass through. For example, when it is a dual potentiometer, only two sets of bases 5 and brush assemblies 6 need to be stacked, and when it is a quad potentiometer, only four sets of bases 5 and brush assemblies 6 need to be stacked. Only the shaft handle 1 with a flat shaft section 13 of an appropriate length needs to be adopted.

[0030] A preferred solution. In this embodiment, a plurality of positioning posts 54 protrude vertically from the top surface of each of the bases 5, and the bottom surface has a first positioning hole 55 adapted to the position of the positioning posts 54. When the bases 5 of each group are stacked, they are inserted and matched with each other through the positioning posts 54 and the first positioning holes 55, which can ensure the concentricity of the bases 5 of each group, thereby ensuring the consistency of the multi - potentiometer.

[0031] A preferred solution. In this embodiment, the resistor body 52 is electrically connected to three pins 521 that radially penetrate the base 5. On one side of each base 5 corresponding to the pins 521, there is a strip - shaped positioning groove 55, and on the bottom surface of the base 5 corresponding to the position of the positioning groove 55, there protrudes a strip - shaped positioning block 56 that matches the contour of the positioning groove 55. Since the pins 521 need to be welded and fixed to the circuit board, this side will bear more force during welding and use. Setting the positioning groove 55 and the positioning block 56 to fix multiple groups of bases 5 can strengthen the bonding strength of this side and ensure the structural stability during use.

[0032] A preferred solution. In this embodiment, both the first partition 4 and the second partition 7 have through - holes for the positioning posts 54 to pass through, and the bottom surface of the bushing 3 has a second positioning hole 33 adapted to the positioning posts 54. The base 5 is inserted and matched with the bottom surface of the bushing 3 after the positioning posts 54 pass through the first partition 4 and the second partition 7, ensuring the reliability and stability of the combination between the bushing 3 and the base 5.

[0033] A preferred solution. In this embodiment, between each of the bases 5, the first partition 4, the second partition 7, and the bushing 3, two rivets 8 at diagonal positions are axially inserted and fixed. The rivets 8 axially fix each part of the potentiometer, ensuring the strength and stability of the overall structure.

[0034] A preferred solution. In this implementation, the bushing 3 is a plastic component. The bushing 3 is formed by plastic molding, further reducing the product cost.

[0035] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A miniature potentiometer structure, characterized in that: include The shaft handle is a plastic integrally molded component, comprising a handle section, a turntable section with a diameter larger than the handle section, and a flat shaft section with a diameter smaller than the turntable section, which are coaxially arranged in sequence; a limit block is radially protruded from the top surface of the turntable section, and a metal spring sheet is installed on the bottom surface of the turntable section, and the spring sheet has a convex point section protruding downward; A shaft sleeve, through which the shaft handle section passes, and having a first sinking cavity for accommodating the turntable portion on its bottom surface, wherein a stopper protrudes from the inner wall of the first sinking cavity and limits the rotation angle of the shaft handle through the limit block; A first metal partition is fixedly attached to the bottom surface of the sleeve, and the first partition has a plurality of grooves distributed around the circumference and in contact with the convex point portion, and a first center hole for the flat shaft segment to pass through; At least one set of bases is fixed to the bottom of the first partition, the top surface of the base is concavely formed with a second sinking cavity, and the inner bottom surface of the second sinking cavity is fixed with a resistor; And a brush assembly is arranged in the second sink cavity, comprising a brush holder adaptively penetrated on the flat shaft segment, and a brush claw fixed on the bottom surface of the brush holder and in contact with the resistor.

2. A miniature potentiometer structure according to claim 1, characterized in that: The groove is a rectangular through hole penetrating the first partition plate, and each of the through holes is radially distributed on the first partition plate. The convex part is a long strip adapted to the groove, and the cross section of the convex part is a concave arc.

3. A miniature potentiometer structure according to claim 2, characterized in that: A second metal partition is attached to the bottom surface of the first partition, and the second partition has a second central hole for the flat shaft segment to pass through.

4. A miniature potentiometer structure according to claim 3, characterized in that: The spring sheet is in the shape of a circular ring as a whole, one side of which is bent downward to form an inclined surface, the convex point portion is stamped and formed at the lowest point of the inclined surface, and the other side of the spring sheet is fitted and fixed to the bottom surface of the turntable portion.

5. A miniature potentiometer structure according to claim 3, characterized in that: When there are no less than two groups of the bases, the bases are stacked in sequence, and the second sink cavity has a third central hole for the flat shaft segment to pass through.

6. A miniature potentiometer structure according to claim 5, characterized in that: A plurality of positioning columns protrude vertically from the top surface of each base, and a first positioning hole is provided on the bottom surface corresponding to the position of the positioning columns.

7. A miniature potentiometer structure according to claim 6, characterized in that: The resistor body is electrically connected to three pins radially extending out of the base, and each base has a strip positioning groove on the top surface corresponding to one side of the pin, and a strip positioning block matching the contour of the positioning groove is protruded from the bottom surface of the base corresponding to the positioning groove.

8. A miniature potentiometer structure according to claim 6, characterized in that: The first partition plate and the second partition plate both have through holes for the positioning column to pass through, and the bottom surface of the sleeve has a second positioning hole adapted to the positioning column.

9. A miniature potentiometer structure according to claim 3, characterized in that: Each of the bases, the first baffle, the second baffle, and the shaft sleeve is fixed along the axial direction by two rivets at diagonal positions.

10. The micro potentiometer structure according to claim 1, characterized in that: The shaft sleeve is a plastic component.

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