Electric brush structure of variable resistance switch

Abstract

The utility model discloses an electric brush structure of a variable resistance switch, which comprises a fixing frame, an electric brush, a circuit board and the like, and is mainly characterized in that the fixing frame is provided with a vertically-penetrating clamping groove and a transversely-penetrating sliding groove, the two ends of the electric brush are respectively provided with a front Z-shaped bending part and a rear Z-shaped bending part, the front Z-shaped bending part is inserted and positioned in the clamping groove in a matched mode, and the rear Z-shaped bending part is inserted and positioned in the sliding groove in a matched mode. Therefore, the rear Z-shaped bending part can form elastic upwarp; therefore, when the circuit board is transversely inserted into the sliding chute, the rear Z-shaped bending part which is elastically warped up can be in elastic contact with the circuit board. Obviously, the front Z-shaped bending part and the rear Z-shaped bending part which are simple in structure and small in bending angle are designed at the two ends of the electric brush, so that the electric brush is not easy to deform due to small bending amount in the die stamping process; meanwhile, the electric brush is not easy to deform in the assembling process and is simpler and more convenient, and the Z-shaped bending part also meets the use requirement of a single-contact structure, so that the electric brush can be better suitable for a small-size electronic switch.

Description

TECHNICAL FIELD

[0001] The utility model relates to a brush structure, specifically a brush structure of variable resistance switch. BACKGROUND

[0002] It is known that the principle of resistance adjustment switch is according to the principle of sliding rheostat, and different resistance values are outputted by the sliding of an internal brush on the carbon paste of PCB circuit board at different positions of the brush, therefore, the electronic switch with variable resistance output cannot do without the important electronic component of brush. Figure 5 The internal brush of the electronic switch on the market usually has two design structures: the first structure is a U-shaped single-sided contact buckle structure as shown in the figure, the structure has only one side of the claw piece, that is, a single contact structure, so the corresponding circuit board resistance track must be designed as double tracks to meet the use needs of small-size electronic switch, but the structure has the disadvantages of complex appearance and large bending angle, and deformation is prone to occur in the electroplating process, and in the installation aspect, a recess with a height basically same as the thickness of the brush, generally about 0.12, is usually designed on the fixing frame, since the end of the brush is pushed into the recess by the stress of the U-shaped bending part in the assembly process, the U-shaped bending part is prone to deformation under the action of external force, thereby affecting the elastic contact of the claw piece and the circuit board and the use reliability of the electronic switch. Figure 6 The second structure is a two-sided contact positioning column fixing structure as shown in the figure, the structure is relatively simple in design and installation compared with the first structure, but the only disadvantage is that the claw pieces are distributed on both sides, that is, a double contact structure, so the corresponding circuit board resistance track must be designed as a single track, and the occupied space is doubled, which is difficult to apply to this structure due to insufficient movement space of the brush for the currently popular small-size electronic switch. TECHNICAL PROBLEM

[0003] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a brush structure of variable resistance switch which can be applied to small-size electronic switch, is simple and convenient in assembly process, does not deform, and avoids affecting the use reliability.

[0004] The technical problem of the utility model is solved by the following technical scheme:

[0005] The utility model relates to a brush structure of variable resistance switch, including fixed frame, brush and circuit board, the fixed frame is equipped with the vertical through clamping groove and the horizontal through sliding slot, the brush both ends are equipped with the front Z type bending part and rear Z type bending part respectively, the front Z type bending part is matched and is positioned in the clamping groove, and makes the rear Z type bending part relative the front Z type bending part in the clamping groove and forms the elastic upwarping, the circuit board is horizontally inserted into the sliding slot, and makes the elastic upwarping of rear Z type bending part and elastic contact on the circuit board.

[0006] The brush is a long strip conductive sheet, the front end of the conductive sheet is bent in Z type and forms the front Z type bending part, the rear end of the conductive sheet is bent in Z type and forms the rear Z type bending part, and the bending direction of the front Z type bending part and the rear Z type bending part is opposite.

[0007] The fixed frame is equipped with the front clamping piece and rear clamping piece side by side along the horizontal direction, and forms the vertical through clamping groove between the front and rear clamping piece.

[0008] The Z type bending of the front Z type bending part refers to the front end of the brush integral bending and forms the holding piece, and the holding piece reversely bends and forms the supporting leg.

[0009] The holding piece is matched and is positioned in the clamping groove, and the supporting leg is upwards and abuts against the bottom of the front clamping piece, and then makes the rear Z type bending part form the elastic upwarping upwards.

[0010] The top surface of the rear clamping piece is arranged as the arc surface that contacts the brush.

[0011] The Z type bending of the rear Z type bending part refers to the rear end of the brush integral bending and forms the connecting piece, and the connecting piece reversely bends and forms the claw piece, and the claw piece is elastically contacted on the circuit board by the elastic upwarping upwards of the rear Z type bending part.

[0012] The fixed frame is equipped with the front stopper and rear stopper side by side along the horizontal direction, and the front and rear stopper are located above the front and rear clamping piece, and form the horizontal through sliding slot between the front and rear stopper and the front and rear clamping piece.

[0013] The rear Z type bending part is elastically upwarping upwards between the front and rear stopper.

[0014] The circuit board is horizontally inserted into the sliding slot from front to back, and then forms the elastic contact with the rear Z type bending part.

[0015] Compared with the prior art, the utility model mainly is equipped with the vertical through -going groove and the horizontal through -going slide groove on the fixed frame of the brush structure, is equipped with the front Z type bending part and rear Z type bending part respectively at the both ends of the brush, and makes the front Z type bending part match and inserts the positioning in the groove, so that the rear Z type bending part can form the elastic upwarp relative to the front Z type bending part in the groove, in this way, when the circuit board is inserted into the slide groove horizontally, can make the elastic upwarp rear Z type bending part elastic contact on the circuit board. Obviously, since only the front Z type bending part and rear Z type bending part of simple structure and small bending angle are designed at the both ends of the brush, the brush is not easy to deform in the die stamping process because of the small bending amount, at the same time, the front Z type bending part only needs to match and insert the positioning in the groove to complete the installation, so that the assembly process of the brush is not easy to deform, and is simpler and more convenient, and the rear Z type bending part also satisfies the use requirement of single contact structure, so it can be better applied to small size electronic switch. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the sectional view of the utility model.

[0017] Figure 2 It is the installation process schematic view of the utility model.

[0018] Figure 3 It is the sectional view of the fixed frame.

[0019] Figure 4 It is the structural schematic view of the brush.

[0020] Figure 5 It is the schematic view of the first existing brush structure.

[0021] Figure 6 It is the schematic view of the second existing brush structure. DETAILED DESCRIPTION

[0022] The utility model embodiment will be explained in detail below according to the above-mentioned drawing.

[0023] As Figures 1-6 Shown, 1. fixed frame, 11. groove, 12. slide groove, 2. brush, 21. front Z type bending part, 211. clamping piece, 212. support foot, 22. rear Z type bending part, 221. connecting piece, 222. claw piece, 3. circuit board, 4. front clamping piece, 5. rear clamping piece, 51. camber, 6. front stop piece, 7. rear stop piece.

[0024] A brush structure of variable resistance switch, as Figure 1 , Figure 2 Shown, mainly relates to a single contact brush structure, it includes fixed frame 1, brush 2 and circuit board 3 etc., and the embodiment is with Figure 1The left side of the view is the front end or front side of the brush structure, the right side of the view is the rear end or rear side of the brush structure, the upper side of the view is the top or top side of the brush structure, and the lower side of the view is the bottom or bottom side of the brush structure.

[0025] As shown in the drawings, the fixed frame 1 is provided with front and rear clamping pieces 4 and 5 arranged side by side in the transverse direction and forming a vertical through clamping groove 11 between the front and rear clamping pieces, and is further provided with front and rear stop pieces 6 and 7 arranged side by side in the transverse direction and located above the front and rear clamping pieces and forming a transverse through sliding groove 12 between the front and rear stop pieces and the front and rear clamping pieces. Figure 3

[0026] The brush 2 is provided with a front Z-shaped bending part 21 and a rear Z-shaped bending part 22 at both ends thereof, as shown in the drawings. Figure 4 The brush 2 is a long strip-shaped conductive piece, the front end of the conductive piece is bent in a Z shape to form the front Z-shaped bending part 21, the Z-shaped bending of the front end refers to that the front end of the brush is integrally bent to form a clamping piece 211, and the clamping piece is reversely bent to form a leg 212; the rear end of the conductive piece is bent in a Z shape to form the rear Z-shaped bending part 22, the Z-shaped bending of the rear end refers to that the rear end of the brush is integrally bent to form a connecting piece 221, and the connecting piece is reversely bent to form a claw piece 222; the bending directions of the front Z-shaped bending part 21 and the rear Z-shaped bending part 22 are opposite.

[0027] Then, the front Z-shaped bending part 21 is fitted and positioned in the clamping groove 11, that is, the clamping piece 211 is fitted and positioned in the clamping groove 11, and the leg 212 is upwardly abutted against the bottom of the front clamping piece 4, so that the rear Z-shaped bending part 22 is elastically and upwardly bent relative to the front Z-shaped bending part 21 in the clamping groove 11.

[0028] Therefore, the design width of the clamping groove 11 and the size and thickness of the front and rear clamping pieces must be designed to ensure that the front Z-shaped bending part 21 can be fitted and positioned in the clamping groove 11, and the elastically and upwardly bent rear Z-shaped bending part 22 can have a deformation amount required by a certain contact pressure, and the elastically and upwardly bent position of the rear Z-shaped bending part 22 is located between the front and rear stop pieces.

[0029] At this time, only the rear end of the circuit board 3 is transversely inserted into the sliding groove 12 from front to back, so that the elastically and upwardly bent rear Z-shaped bending part 22 is elastically contacted on the circuit board 3, that is, the claw piece 222 is elastically contacted on the circuit board 3 by the elastically and upwardly bent rear Z-shaped bending part 22 and is supported by the circuit board, and the assembly is completed. Since the brush 2 is not subjected to any resistance during the assembly process, the brush deformation caused by the assembly process does not exist.

[0030] ​Of course, the front Z-shaped bending part 21 and the rear Z-shaped bending part 22 can also be designed into other bending shapes, as long as the front end of the brush 2 can be clamped and the rear end can be elastically buckled, and the Z-shaped bending is relatively best in use effect.

[0031] The top surface of the rear clamping piece 5 can also be provided with an arc surface 51 to contact the brush 2, and the arc surface 51 can improve the elastic force of the rear Z-shaped bending part 22.

[0032] Obviously, since the utility model only designs the front Z-shaped bending part 21 and the rear Z-shaped bending part 22 with simple structure and small bending angle at both ends of the brush 2, the brush is not easy to deform in the die stamping process due to the small bending amount.

[0033] Meanwhile, the front Z-shaped bending part 21 only needs to be matched and inserted into the clamping groove 11 to complete the installation, so that the assembly process is more simple and convenient, and the rear Z-shaped bending part 22 also meets the use requirements of the single contact structure, and the corresponding circuit board resistance track must be designed into a double track, so that the circuit board 3 will not be very large, and therefore can be better applied to small volume electronic switches.

[0034] The above-mentioned embodiments are only used for illustrating the utility model and not for limiting the scope of the utility model. In addition, it should also be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. A brush structure of a variable resistance switch, comprising a fixing frame (1), a brush (2) and a circuit board (3), characterized in that, the fixing frame (1) is provided with a vertical through clamping groove (11) and a horizontal through sliding groove (12); the brush (2) is provided with a front Z-shaped bending part (21) and a rear Z-shaped bending part (22) at two ends respectively, the front Z-shaped bending part (21) is inserted and positioned in the clamping groove (11), and the rear Z-shaped bending part (22) is elastically raised relative to the front Z-shaped bending part (21) in the clamping groove (11); the circuit board (3) is horizontally inserted into the sliding groove (12), and the elastically raised rear Z-shaped bending part (22) elastically contacts the circuit board (3).

2. A brush structure for a variable resistance switch according to claim 1, wherein the brush (2) is a long strip-shaped conductive sheet, the front end of the conductive sheet is bent in a Z-shaped manner to form the front Z-shaped bending part (21), the rear end of the conductive sheet is bent in a Z-shaped manner to form the rear Z-shaped bending part (22), and the bending directions of the front Z-shaped bending part (21) and the rear Z-shaped bending part (22) are opposite.

3. A brush structure for a variable resistance switch as defined in claim 1, wherein the fixing frame (1) is provided with a front clamping piece (4) and a rear clamping piece (5) arranged side by side in the horizontal direction, and the vertical through clamping groove (11) is formed between the front and rear clamping pieces.

4. A brush structure for a variable resistance switch according to claim 3, wherein the Z-shaped bending of the front Z-shaped bending part (21) refers to that the front end of the brush is integrally bent to form a clamping piece (211), and the clamping piece is reversely bent to form a leg (212).

5. A brush structure for a variable resistance switch according to claim 4, wherein the clamping piece (211) is inserted and positioned in the clamping groove (11), and the leg (212) upwardly abuts against the bottom of the front clamping piece (4), so that the rear Z-shaped bending part (22) is elastically raised upwardly.

6. A brush structure for a variable resistance switch as defined in claim 4, wherein the top surface of the rear clamping piece (5) is provided with an arc surface (51) which contacts the brush (2).

7. A brush structure for a variable resistance switch as defined in claim 5, wherein the Z-shaped bending of the rear Z-shaped bending part (22) refers to that the rear end of the brush is integrally bent to form a connecting piece (221), and the connecting piece is reversely bent to form a claw piece (222), and the claw piece is elastically contacted on the circuit board (3) by the upward elastic raising of the rear Z-shaped bending part (22).

8. A brush structure for a variable resistance switch as defined in claim 5, wherein the fixing frame (1) is provided with a front stop piece (6) and a rear stop piece (7) arranged side by side in the horizontal direction, the front and rear stop pieces are located above the front and rear clamping pieces, and the horizontal through sliding groove (12) is formed between the front and rear stop pieces and the front and rear clamping pieces.

9. A brush structure for a variable resistance switch as claimed in claim 8, characterized in that the rear Z-shaped bending part (22) is elastically raised upwardly between the front and rear stop pieces.

10. A brush structure for a variable resistance switch as defined in claim 1, wherein the circuit board (3) is horizontally inserted into the sliding groove (12) from front to back, and then elastically contacts the rear Z-shaped bending part (22).

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