Rotary potentiometer

Abstract

The present invention discloses a rotary potentiometer. The key points of the technical solution are as follows: it includes an upper cover and a lower cover that are fixedly covered with each other. The upper cover and the lower cover form a covered cavity. The upper cover is connected with a knob. A resistance sheet is installed inside the covered cavity. The resistance sheet is connected with a wiring terminal, and the wiring terminal extends out of the lower cover. Inside the covered cavity, there is a conductive sliding piece that rotates synchronously with the knob, and the conductive sliding piece elastically abuts against the resistance sheet. The conductive sliding piece is fixed with a turntable. The inner wall of the upper cover is provided with an internal gear. The outer edge of the turntable is fixed with an elastic strip that is bent along the outer edge of the turntable. One end of the elastic strip is fixed with a block that is snapped into the tooth groove in the internal gear. The surface of the block that is snapped into the tooth groove is a semi-circular surface. The method of snapping the block into the tooth groove is adopted to achieve the grading positioning of the turntable and the conductive sliding piece. Since the elastic strip and the turntable are fixedly connected, the installation of the two is more convenient, reducing the assembly difficulty.

Description

Technical Field

[0001] The present invention relates to a potentiometer, and more specifically, to a rotary potentiometer. Background Art

[0002] A potentiometer is an adjustable electronic component.

[0003] A Chinese patent with the application number CN201720460370.2 is retrieved. Its patent name is a carbon film potentiometer. It is recorded in claim 1 that "the toothed dial head is arranged in the inner cavity of the bushing, and steel balls are placed in the grooves formed between adjacent teeth of the toothed dial head; that is, a multi-stage speed regulation structure is formed by the mutual cooperation between the toothed dial head, the steel balls and the spring."

[0004] When the steel balls and the spring are assembled manually, it is necessary to squeeze the steel balls against the spring and then snap them into the work position. Since the steel balls are spherical and have a small volume, they are likely to slip off the worker's hand when squeezing the spring, increasing the difficulty of assembly. Summary of the Invention

[0005] The purpose of the present invention is to provide a rotary potentiometer, which realizes the grading positioning of the turntable and the conductive sliding piece by the way of the clamping block being snapped into the tooth groove. Since the elastic strip and the turntable are fixedly connected, the installation of the two is more convenient, reducing the assembly difficulty.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions:

[0007] A rotary potentiometer includes an upper cover and a lower cover that are fixedly covered with each other. The upper cover and the lower cover form a covered cavity. The upper cover is connected with a knob. A resistance sheet is installed inside the covered cavity. The resistance sheet is connected with a wiring terminal, and the wiring terminal extends out of the lower cover. A conductive sliding piece that rotates synchronously with the knob is arranged inside the covered cavity. The conductive sliding piece elastically abuts against the resistance sheet. A turntable is fixed to the conductive sliding piece. An internal gear is arranged on the inner wall of the upper cover. An elastic strip that is bent along the outer edge of the turntable is fixed to the outer edge of the turntable. A clamping block that is snapped into the tooth groove in the internal gear is fixed to one end of the elastic strip. The surface of the clamping block that is snapped into the tooth groove is a semi-circular surface.

[0008] By adopting the above technical solution, in the rotary gear position of this design, the original conventional steel balls or metal jump wheels are discarded to realize the rotary gear position, but the elastic strip is used to push the clamping block into the tooth groove to realize the gear shifting positioning. When the clamping block is inserted into the tooth groove, the blocking resistance between the two makes the turntable unable to rotate freely. Moreover, due to the elastic force of the elastic strip, the clamping block always has a movement tendency to be snapped into the tooth groove, which also makes the turntable remain stable when the clamping block is snapped into the tooth groove.

[0009] When the knob is manually rotated, the locking block can overcome the blocking force of the tooth groove. In this design, one side of the locking block is a semi-circular surface. By utilizing the relatively smooth arc surfaces on both sides of the semi-circular surface, it is beneficial for the locking block to smoothly slide out of the tooth groove during forward and reverse rotations.

[0010] Preferably, the elastic strip is fixed with a mounting ring, and the turntable is fixed with an insertion block. The mounting ring is provided with a slot, and the insertion block is inserted into the slot to achieve synchronous rotation of the elastic strip and the turntable.

[0011] By adopting the above technical solution, the insertion connection between the mounting ring and the turntable realizes the fixation of the two in the rotation direction. The use of two separate parts is for the convenience of separate injection molding of the turntable and the mounting ring, which is beneficial to reducing the injection molding difficulty of the turntable and the mounting ring for the mold.

[0012] Preferably, the number of elastic strips is 4. Two elastic strips form a group, and the two groups of elastic strips are centrosymmetric with respect to the center of the turntable; the two elastic strips in one group are axially symmetric with respect to the diameter of the turntable.

[0013] By adopting the above technical solution, the four elastic strips individually correspond to the four locking blocks. Therefore, the symmetric arrangement of the four elastic strips makes the clamping force of the locking blocks on the tooth groove more dispersed, and the clamping effect is more stable.

[0014] Preferably, a jack is provided at the center of the turntable. One side of the jack is a flat surface, and the knob is fixed with an insertion post, and the insertion post is adaptively inserted into the jack.

[0015] By adopting the above technical solution, the insertion connection between the insertion post and the jack is to achieve synchronous rotation of the turntable and the knob. One side of the jack is a flat surface to prevent the knob from rotating relative to the turntable.

[0016] Preferably, a rotating shaft is fixed at the lower end of the turntable, and a protruding rotating ring is fixed at the bottom of the lower cover, and the rotating shaft is inserted into the rotating ring.

[0017] By adopting the above technical solution, the design of the rotating shaft and the rotating ring makes the rotation of the turntable relative to the lower cover more stable. Of course, it can also provide an insertion and positioning relationship for the rotating shaft and the rotating ring, making the installation of the turntable and the lower cover more accurate and efficient.

[0018] Preferably, the lower cover is provided with a fixing ring, and the fixing ring is sleeved on the rotating ring. The resistance chip and the wiring terminal are both fixed on the fixing ring.

[0019] By adopting the above technical solution, the fixing ring serves as a carrier for the resistance chip and the wiring terminal. The way of sleeving the fixing ring with the rotating ring makes the installation more accurate and efficient.

[0020] Preferably, the resistance chip includes a plurality of chip resistors, and the chip resistors are connected in series along the circumferential direction of the fixing ring.

[0021] By adopting the above technical solution, compared with the traditional synthetic carbon film, this design is in the form of a patch resistor, with very high resistance accuracy (it can achieve ±1%; the conventional one is 20%), so the resistance output is more stable.

[0022] Preferably, the upper cover and the lower cover are fixedly connected by ultrasonic.

[0023] By adopting the above technical solution, the ultrasonic connection has better sealing performance.

[0024] Preferably, the knob is in the shape of an umbrella cap, and the outer surface of the knob is provided with friction lines.

[0025] By adopting the above technical solution, the umbrella cap shape is beneficial to covering the upper cover, and the friction texture is beneficial to manual rotation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic structural diagram of the embodiment;

[0027] Figure 2 is a schematic structural diagram of the knob in the embodiment;

[0028] Figure 3 is a schematic structural diagram when the upper cover and the lower cover are sealed in the embodiment;

[0029] Figure 4 is a schematic structural diagram when the inner gear of the frame ring and the upper cover are engaged in the embodiment;

[0030] Figure 5 is an exploded schematic diagram of the upper cover and the lower cover in a top view state in the embodiment;

[0031] Figure 6 is an exploded schematic diagram of the upper cover and the lower cover in a bottom view state in the embodiment.

[0032] In the figure:

[0033] 11. Knob; 12. Upper cover; 13. Lower cover;

[0034] 21. Fixed ring; 22. Wiring terminal; 23. Resistance sheet; 231. Patch resistor;

[0035] 31. Conductive slide; 32. Turntable;

[0036] 4. Inner gear;

[0037] 51. Frame ring; 52. Elastic strip; 53. Block; 531. Semi-circular surface;

[0038] 61. Insert block; 62. Insert slot;

[0039] 71. Insert post; 72. Insert hole;

[0040] 81. rotating shaft; 82. rotating ring;

[0041] 9. Friction lines. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0043] Embodiment, a rotary potentiometer, referring to Figures 1-6 , and the following instructions are given.

[0044] like Figure 1 and Figure 3 As shown, the rotary potentiometer includes an upper cover 12 and a lower cover 13 which are covered and fixed to each other. When the upper cover 12 and the lower cover 13 are covered, a covering cavity is formed inside. The upper cover 12 and the lower cover 13 are fixedly connected by ultrasound.

[0045] The upper cover 12 is connected to a knob 11, which is in the shape of an umbrella. The outer surface of the knob 11 is provided with friction lines 9, which are concave grooves. The friction lines 9 are arranged along the circumference of the knob 11. Figure 2 and Figure 5 A socket 72 is provided at the center of the turntable 32, one side of the socket 72 is a plane, a plug post 71 is fixed to the knob 11, the plug post 71 and the socket 72 are adapted to fit together, and it is obvious that the plug post 71 itself is also a cylindrical structure, and a plane is cut along the axis direction of the plug post 71. Figure 3 and Figure 5 The upper cover 12 is provided with a circular hole, and the plug post 71 enters into the rotating disk 32 through the circular hole.

[0046] Reference Figure 4 , Figure 5 and Figure 6 A raised rotating ring 82 is fixed at the bottom of the lower cover 13, and a fixing ring 21 is provided on the lower cover 13. The fixing ring 21 is sleeved on the rotating ring 82, and the resistor 23 and the terminal 22 are fixed on the fixing ring 21. The resistor 23 is located inside the cover cavity, and the resistor 23 is connected to the terminal 22, and the terminal 22 extends out of the lower cover 13.

[0047] The resistor sheet 23 includes a plurality of chip resistors 231 , and the chip resistors 231 are connected in series along the circumferential direction of the fixing ring 21 through copper sheets.

[0048] The rotating disk 32 is located above the fixed ring 21 , and a rotating shaft 81 is fixed to the lower end of the rotating disk 32 . The rotating shaft 81 is inserted into the rotating ring 82 , so that the rotating disk 32 is positioned and installed. The lower cover 13 limits the axial contact of the rotating shaft 81 so that the rotating disk 32 is located parallel to the fixed ring 21 .

[0049] A conductive slide 31 is provided inside the cover cavity, which rotates synchronously with the knob 11. The conductive slide 31 elastically contacts the resistor 23. The conductive slide 31 is riveted to the turntable 32, so when the turntable 32 rotates, the conductive slide 31 slides on the resistor 23 to achieve the purpose of gear shifting.

[0050] The turntable 32 and the knob 11 are linked together, so by rotating the knob 11 , the position of the conductive slider 31 on the resistor 23 can be controlled.

[0051] A frame ring 51 is fixed above the rotating disk 32. The frame ring 51 is hollow and is used for the insertion of the column 71.

[0052] The upper end surface of the turntable 32 is fixed with an insert block 61, which is in the shape of a fan ring. The frame ring 51 is provided with a slot 62, which is also in the shape of a fan ring. The insert block 61 is inserted into the slot 62 in the axial direction to fix the frame ring 51 and the turntable 32 in the circumferential direction, and the frame ring 51 and the turntable 32 can rotate synchronously.

[0053] The inner wall of the upper cover 12 is provided with an inner gear 4, and the outer edge of the frame ring 51 is fixed with an elastic strip 52 bent along the outer edge of the rotating disk 32. Of course, the position of the elastic strip 52 is also located at the outer edge of the rotating disk 32.

[0054] The elastic strip 52 is made of plastic, which has low cost, easy assembly, and better stability compared to the structure of steel balls and springs.

[0055] Since the elastic strip 52 is bent, it is elastic. One end of the elastic strip 52 is fixed to the frame ring 51. The other end of the elastic strip 52 is a clamping block 53. The elastic strip 52 has an elastic force on the clamping block 53, and the elastic force pushes the clamping block 53 to move toward the outside of the frame ring 51. Therefore, the clamping block 53 at one end of the elastic strip 52 is clamped into the tooth groove of the internal gear 4, and the side of the clamping block 53 clamped into the tooth groove is a semicircular surface 531.

[0056] There are four elastic strips 52 on the frame ring 51 , two elastic strips 52 form a group, and the two groups of elastic strips 52 are symmetrical relative to the center of the rotating disk 32 ; the two elastic strips 52 in one group are symmetrical relative to the diameter axis of the rotating disk 32 .

[0057] In this embodiment, the lower cover 13, the fixing ring 21, the turntable 32, the frame ring 51, and the upper cover 12 are stacked and assembled in sequence. This one-by-one assembly method is extremely convenient to operate, making it easy for the staff to install. Moreover, the stacking mode can make full use of the space between the upper cover 12 and the lower cover 13, making the rotary potentiometer more compact, thereby increasing the loading capacity during subsequent packaging and transportation.

[0058] The above are only the preferred embodiments of the present invention, and the protection scope of the invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A rotary potentiometer, comprising an upper cover (12) and a lower cover (13) which are fixedly covered with each other, the upper cover (12) and the lower cover (13) form a covered cavity, and the upper cover (12) is connected with a knob (11), characterized in that: Inside the covering cavity, a resistance chip (23) is installed. The resistance chip (23) is connected to a wiring terminal (22), and the wiring terminal (22) extends out of the lower cover (13). Inside the covering cavity, a conductive sliding piece (31) that rotates synchronously with the knob (11) is provided. The conductive sliding piece (31) elastically abuts against the resistance chip (23). A turntable (32) is fixed to the conductive sliding piece (31). An internal gear (4) is provided on the inner wall of the upper cover (12). Along the outer edge of the turntable (32), an elastic strip (52) that bends along the outer edge of the turntable (32) is fixed to the outer side of the turntable (32). One end of the elastic strip (52) is fixed with a block (53) that is snapped into the tooth groove in the internal gear (4). The surface of the block (53) snapped into the tooth groove is a semi-circular surface (531). A frame ring (51) is fixed to the elastic strip (52), and an insertion block (61) is fixed to the turntable (32). The frame ring (51) is provided with a slot (62), and the insertion block (61) is inserted into the slot (62) to realize the synchronous rotation of the elastic strip (52) and the turntable (32). The number of elastic strips (52) is 4. Two elastic strips (52) form a group, and the two groups of elastic strips (52) are centrosymmetric with respect to the center of the circle of the turntable (32). The two elastic strips (52) in one group are axially symmetric with respect to the diameter of the turntable (32). The upper cover (12) and the lower cover (13) are fixedly connected by ultrasonic means.

2. The rotary potentiometer according to claim 1, characterized in that: A jack (72) is provided at the center of the turntable (32). One side of the jack (72) is a flat surface. An insertion post (71) is fixed to the knob (11), and the insertion post (71) is adapted to be inserted into the jack (72).

3. The rotary potentiometer according to claim 2, wherein: A rotating shaft (81) is fixed to the lower end of the turntable (32). A protruding rotating ring (82) is fixed to the bottom of the lower cover (13), and the rotating shaft (81) is inserted into the rotating ring (82).

4. The rotary potentiometer according to claim 3, characterized in that: The lower cover (13) is provided with a fixing ring (21). The fixing ring (21) is sleeved on the rotating ring (82), and both the resistance chip (23) and the wiring terminal (22) are fixed to the fixing ring (21).

5. The rotary potentiometer according to claim 4, characterized in that: The resistance chip (23) includes a plurality of chip resistors (231), and the chip resistors (231) are connected in series along the circumferential direction of the fixing ring (21).

6. The rotary potentiometer according to claim 1, wherein: The knob (11) is in the shape of an umbrella cap, and friction lines (9) are provided on the outer surface of the knob (11).

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