DC trigger switch with double contact structure

Abstract

A DC trigger switch with a dual-contact structure provided by the present invention includes a base body, an upper cover, and a push shaft; a swing piece and a swing piece spring are provided at the top of one side of the push shaft, a first moving contact connected to the swing piece is provided at the top of the swing piece, a moving contact bracket and a power input terminal are provided above the first moving contact, a negative terminal is provided on the other side of the push shaft; a circuit board is provided above the push shaft, one ends of the moving contact bracket and the negative terminal pass through the circuit board and are connected by a connecting piece; a slider connected to the push shaft is provided at the bottom of the push shaft, a moving contact spring is provided on the slider, a second moving contact is provided at one end of the moving contact spring, moving contacts are provided on both the first moving contact and the second moving contact, static contacts are provided on both the power input terminal and the negative terminal; the moving contact on the first moving contact cooperates with the bottom of the power input terminal; the moving contacts on the second moving contact cooperate with the static contacts on the power input terminal and the negative terminal respectively.

Description

Technical Field

[0001] The present invention relates to a DC trigger switch with a dual contact structure. Background Art

[0002] 1. The conventional DC trigger switch only has a set of silver contacts and can only be used for general DC power tools with relatively small currents. When a large current exceeding 20A appears during the use of the power tool, it is very easy to burn out the switch, resulting in problems such as the inability to turn off the power tool, which poses serious safety hazards and does not meet national safety standards.

[0003] 2. When the conventional DC trigger switch is used in a DC brushless power tool, the commutation part uses direct mechanical contact between a reed and copper foil on the circuit board to output high and low levels to achieve the output of commutation signals. Generally, the mechanical friction coefficient between metals is relatively large. When used in a DC electric wrench, due to the large vibration during use, the friction between the reed and the circuit board is accelerated, greatly reducing the service life of the power tool. In severe cases, there will be problems such as commutation failure. Since electric wrenches are generally used for high-altitude operations, if commutation fails, it is extremely likely to pose serious safety hazards to personal safety and does not meet national safety standards.

[0004] Therefore, it is imperative to design a DC trigger switch with a dual contact connection structure that is not prone to commutation failure and has a long service life. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a DC trigger switch with a dual contact structure.

[0006] A DC trigger switch with a dual contact structure provided by the present invention has the following technical solution:

[0007] The trigger switch includes a base body, an upper cover, and a push shaft;

[0008] On the top of one side of the push shaft, a swing piece and a swing piece spring are provided. On the top of the swing piece, a first moving contact connected to the swing piece is provided. Above the first moving contact, a moving contact bracket and a power input terminal are provided. On the other side of the push shaft, a negative terminal is provided;

[0009] Above the push shaft, a circuit board is provided. One end of the moving contact bracket and one end of the negative terminal both pass through the circuit board and are connected through a connecting piece provided on the circuit board;

[0010] At the bottom of the push shaft, a slider connected to the push shaft is provided. On the slider, a moving contact spring is provided. One end of the moving contact spring is provided with a second moving contact;

[0011] The first moving contact and the second moving contact are both provided with moving contacts, and the power input terminal and the negative terminal are both provided with static contacts;

[0012] The moving contact on the first moving contact cooperates with the bottom of the power input terminal;

[0013] The moving contacts on the second moving contact cooperate with the static contacts on the power input end and the negative terminal respectively.

[0014] Wherein, the other end of the moving contact spring is provided with a brake pad, and a brake terminal connected to the circuit board is provided below the circuit board.

[0015] Wherein, a sliding reed capable of sliding on the circuit board is provided at the top of the push shaft.

[0016] Wherein, a first commutation structure is provided above the circuit board, and the first commutation structure includes:

[0017] A first commutation turntable, and a magnet seat provided above the circuit board;

[0018] A first magnet and a second magnet with opposite polarities are provided inside the magnet seat;

[0019] A Hall element is provided on the circuit board at a position corresponding to the perpendicular bisector of the first magnet and the second magnet;

[0020] A magnet seat spring is provided at the top of the magnet seat, a ball spring is provided at the top of the magnet seat, and balls are provided at both ends of the ball spring;

[0021] When the first commutation turntable is rotated so that the first magnet and the Hall element are on the same straight line, the Hall element outputs a positive level;

[0022] When the first commutation turntable is rotated so that the second magnet and the Hall element are on the same straight line, the Hall element outputs a negative level.

[0023] Wherein, a second commutation structure is provided above the circuit board, and the second commutation structure includes:

[0024] A second commutation turntable, and a first commutation terminal, a second commutation terminal, a third commutation terminal, and a fourth commutation terminal are provided at the bottom of the second commutation turntable;

[0025] Commutation moving contacts are provided at the tops of the first commutation terminal and the third commutation terminal, and commutation moving contact springs are provided above the commutation moving contacts;

[0026] A ball spring is provided between the two commutation moving contacts, and balls are provided at both ends of the ball spring.

[0027] Wherein, a first cavity is provided at the bottom of the push shaft, and the slider is arranged in the first cavity;

[0028] A second cavity is provided on the slider, and the second moving contact and the moving contact spring are both arranged in the second cavity.

[0029] Wherein, a boss is provided on one side of the push shaft, a swing piece slot is provided on the boss, and the swing piece and the swing piece spring are both arranged in the swing piece slot.

[0030] Wherein, a first clamping block is provided at one end of the swing piece close to the first moving contact, a clamping hole is provided on the first moving contact, and the first clamping block is clamped in the clamping hole.

[0031] Wherein, a push shaft groove is provided at the top of the push shaft;

[0032] A fixing column is provided at the center of the push shaft groove, and clamping grooves are provided on both sides of the push shaft;

[0033] A fixing hole is provided at the center of the sliding reed, and second clamping blocks are provided on both sides of the sliding reed;

[0034] The fixing column is clamped in the fixing hole, and the second clamping block is clamped in the clamping groove.

[0035] Wherein, a trigger is provided at one end of the push shaft extending out of the box body, a push shaft through hole is provided at the other end, a positioning column is provided in the push shaft through hole, and a return spring is provided on the positioning column.

[0036] The implementation of the present invention includes the following technical effects:

[0037] The present invention is a novel trigger switch. The first moving contact first connects to the power input terminal. There is a relative friction action during the connection process, and there is also an opposite friction action during the disconnection process. Thus, it can remove the blackening or dirt on the surface of the moving contact caused by the filtering capacitor discharge of the battery pack and other factors, making the switch connection good. And, after the second moving contact is connected, the double contacts of the two groups of parallel moving contacts have an asynchronous connection function, and the two groups of contacts are conducted simultaneously, making the switch have a greater current-carrying capacity. Therefore, the switch disclosed in the present invention can pass a larger current and the switch is not easily burned out.

[0038] 2. The structure of the present invention is novel, the cost is low, the use, maintenance and repair are simple, and it can be widely used in various DC hand-held electric tools. When used in brushless motor DC electric tools, its non-contact electronic signal commutation structure that controls the Hall element through a magnet is durable, so that the switch commutation structure is not easily damaged.

[0039] 3. The structure of the present invention is novel and applicable to various DC hand-held power tools, such as DC drills, DC hammers, DC electric wrenches, DC impact screwdrivers, etc., meeting the national safety standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 FIG. is a perspective view of a DC trigger switch with a dual-contact structure of the present invention in an open state, which is used for brushless power tools.

[0041] Figure 2 FIG. is a perspective view of a DC trigger switch with a dual-contact structure of the present invention, which is used for brushed power tools.

[0042] Figure 3 is Figure 1 a schematic diagram of a partial structure of.

[0043] Figure 4 is Figure 2 a schematic diagram of a partial structure of.

[0044] Figure 5 is Figure 1 an exploded view of a DC trigger switch with a dual-contact structure in.

[0045] Figure 6 is Figure 2 an exploded view of a DC trigger switch with a dual-contact structure in.

[0046] Figure 7 is Figure 1 a partial structure combination diagram of a DC trigger switch with a dual-contact structure in.

[0047] Figure 8 is Figure 2 a partial structure combination diagram of a DC trigger switch with a dual-contact structure in.

[0048] In the figure, 1 - base body, 2 - upper cover, 3 - push shaft, 4 - swing piece, 5 - swing piece spring, 6 - first moving contact, 7 - moving contact support, 8 - power input terminal, 9 - negative terminal, 10 - circuit board, 11 - connecting piece, 12 - slider, 13 - moving contact spring, 14 - second moving contact, 15 - moving contact point, 16 - static contact point, 17 - brake pad, 18 - brake terminal, 19 - sliding reed, 20 - first commutation turntable, 21 - magnet seat, 22 - first magnet, 23 - second magnet, 24 - Hall element, 25 - magnet seat spring, 26 - ball spring, 27 - ball, 28 - second commutation turntable, 29 - first commutation terminal, 30 - second commutation terminal, 31 - third commutation terminal, 32 - fourth commutation terminal, 33 - commutation moving contact, 34 - commutation moving contact spring, 35 - trigger, 36 - return spring, 301 - first cavity, 302 - boss, 303 - swing piece slot, 304 - push shaft groove, 305 - fixing post, 306 - slot, 41 - first clamping block, 36 - trigger spring, 61 - clamping hole, 121 - second cavity, 191 - fixing hole, 192 - second clamping block. Detailed implementation mode

[0049] The present invention will be described in detail below in combination with embodiments and the accompanying drawings. It should be noted that the described embodiments are only for facilitating the understanding of the present invention and do not limit it in any way. The directions such as up, down, left, and right described in this application are used for the convenience of description with reference to the accompanying drawings and do not constitute a limitation on the protection scope.

[0050] As Figure 1-6 shown, a DC trigger switch with a double contact structure provided in this embodiment includes a base body 1, an upper cover 2, and a push shaft 3;

[0051] A swing piece 4 and a swing piece spring 5 are arranged at the top of one side of the push shaft 3. A first moving contact 6 connected to the swing piece 4 is arranged at the top of the swing piece 4. A moving contact support 7 and a power input terminal 8 are arranged above the first moving contact 6. A negative terminal 9 is arranged on the other side of the push shaft 3;

[0052] A circuit board 10 is arranged above the push shaft 3. One end of the moving contact support 7 and one end of the negative terminal 9 both pass through the circuit board 10 and are connected through a connecting piece 11 arranged on the circuit board 10;

[0053] A slider 12 connected to the push shaft 3 is arranged at the bottom of the push shaft 3. A moving contact spring 13 is arranged on the slider 12. A second moving contact 14 is arranged at one end of the moving contact spring 13;

[0054] The first moving contact 6 and the second moving contact 14 are both provided with moving contacts 15, and the power input terminal 8 and the negative terminal 9 are both provided with static contacts 16;

[0055] The moving contact 15 on the first moving contact 6 cooperates with the bottom of the power input terminal 8;

[0056] The moving contacts 15 on the second moving contact 14 respectively cooperate with the static contacts 16 on the power input terminal 8 and the negative terminal 9.

[0057] The trigger switch in the embodiment of the present disclosure is a novel trigger switch, which can be used for brushless motor DC power tools. It has the first moving contact first connected to the power input terminal, and there is a relative friction action during the connection process, and there is also an opposite friction action during the disconnection process, so as to remove the blackening or dirt on the surface of the moving contact caused by the filtering capacitor discharge of the battery pack and other factors, making the switch connection good.

[0058] Moreover, after the second moving contact is connected, the double contacts of the two groups of parallel moving contacts have an asynchronous connection function, and the two groups of contacts are conducted simultaneously, so that the switch has a greater current-carrying capacity, and thus the switch of the present disclosure can pass a larger current and the switch is not easily burned out.

[0059] Furthermore, the trigger switch in the embodiment of the present disclosure has a novel structure, low cost, simple use, maintenance and repair, and can be widely used in various DC hand-held power tools. When used in brushless motor DC power tools, its non-contact electronic signal commutation structure that controls the Hall element through a magnet is durable, so that the switch commutation structure is not easily damaged.

[0060] Finally, the trigger switch in the embodiment of the present disclosure is applicable to various DC hand-held power tools, such as: DC drills, DC hammers, DC electric wrenches, DC impact screwdrivers, etc., and meets the national safety standards.

[0061] In one embodiment, as Figure 2 、 4 、6 shows, the other end of the moving contact spring 13 is provided with a brake pad 17, and a brake terminal 18 connected to the circuit board 10 is provided below the circuit board 10. The switch in this embodiment can be used for brush electric tools to achieve a braking function.

[0062] Preferably, as Figure 5 、 6 shows, the top of the push shaft 3 is provided with a sliding reed 19 that can slide on the circuit board 10.

[0063] Preferably, as Figure 1 、 3, as shown in FIGS. 5, a first commutation structure is provided above the circuit board 10, and the first commutation structure includes:

[0064] A first commutation turntable 20, and a magnet base 21 provided above the circuit board 10;

[0065] A first magnet 22 and a second magnet 23 with opposite polarities are provided inside the magnet base 21;

[0066] A Hall element 24 is provided on the circuit board 10 at a position corresponding to the perpendicular bisector of the first magnet 22 and the second magnet 23;

[0067] A magnet base spring 25 is provided at the top of the magnet base 21, a ball spring 26 is provided at the top of the magnet base 21, and balls 27 are provided at both ends of the ball spring 26;

[0068] When the first commutation turntable 20 is rotated so that the first magnet 22 and the Hall element 24 are on the same straight line, the Hall element 24 outputs a positive level;

[0069] When the first commutation turntable 20 is rotated so that the second magnet 23 and the Hall element 24 are on the same straight line, the Hall element 24 outputs a negative level.

[0070] The switch in the embodiment of the present disclosure can be used for speed regulation of brushless electric tools.

[0071] In one embodiment, as Figure 2 , 4 , as shown in FIGS. 6, a second commutation structure is provided above the circuit board 10, and the second commutation structure includes:

[0072] A second commutation turntable 28, and a first commutation terminal 29, a second commutation terminal 30, a third commutation terminal 31, and a fourth commutation terminal 32 are provided at the bottom of the second commutation turntable 28;

[0073] Commutation moving contacts 33 are provided at the tops of the first commutation terminal 29 and the third commutation terminal 31, and commutation moving contact springs 34 are provided above the commutation moving contacts 33;

[0074] A ball spring 26 is provided between the two commutation moving contacts 33, and balls 27 are provided at both ends of the ball spring 26.

[0075] The switch in the embodiment of the present disclosure can be used for speed regulation of brushed electric tools.

[0076] In one embodiment, as Figure 5-8 shown, a first cavity 301 is provided at the bottom of the push shaft 3, and the slider 12 is disposed inside the first cavity 301;

[0077] A second cavity 121 is provided on the slider 12, and the second moving contact 14 and the moving contact spring 13 are both arranged in the second cavity 121.

[0078] In one embodiment, as Figure 5-8 shown, a boss 302 is provided on one side of the push shaft 3, and a swing piece slot 303 is provided on the boss. The swing piece 4 and the swing piece spring 5 are both arranged in the swing piece slot 303.

[0079] In one embodiment, a first clamping block 41 is provided at one end of the swing piece 4 close to the first moving contact 6, a clamping hole 61 is provided on the first moving contact 6, and the first clamping block 41 is clamped in the clamping hole 61.

[0080] In one embodiment, as Figure 5-8 shown, a push shaft groove 304 is provided at the top of the push shaft 3;

[0081] A fixing column 305 is provided at the center of the push shaft groove 304, and clamping grooves 306 are provided on both sides of the push shaft 3;

[0082] A fixing hole 191 is provided at the center of the sliding reed 19, and second clamping blocks 192 are provided on both sides of the sliding reed 19;

[0083] The fixing column 305 is clamped in the fixing hole 191, and the second clamping block 192 is clamped in the clamping groove 306.

[0084] In one embodiment, as Figure 1-6 shown, one end of the push shaft 3 extending out of the box body is provided with a trigger 35, the other end is provided with a push shaft through hole, a positioning column is arranged in the push shaft through hole, and a return spring 36 is arranged on the positioning column.

[0085] For a DC trigger switch with a double contact structure provided by the present invention, when it is used as a brushed DC switch, its working process is as follows:

[0086] When the trigger 35 is pressed, it drives the push shaft 3 to slide rightward. The push shaft 3 first drives the brake pad 17 to slide rightward, causing the moving contact holder 7 to disconnect from the brake terminal 18. Then it drives the swing piece 4 to slide rightward, thereby driving the first moving contact 6 to slide on the moving contact holder 7. When the slide exceeds the midpoint of the first moving contact 6, the first moving contact 6 will have a tipping action upward, causing the moving contact 15 on the first moving contact 6 to connect with the power input terminal 8, thus making the moving contact holder 7 connect with the power input terminal 8. Since both the pointed parts on the moving contact holder 7 and the negative terminal 9 penetrate through the circuit board 10 respectively and are welded together through the connecting piece 11 arranged on the circuit board 10, therefore, the moving contact holder 7, the power input terminal 8, and the negative terminal 9 are connected simultaneously.

[0087] Continue to press the trigger 35 to the end. The push shaft 3 drives the moving contact spring 13 and the slider 12 to slide rightward. The slider 12 drives the second moving contact 14 to slide rightward, causing the moving contact 15 on the second moving contact 14 to connect with the static contacts 16 on both the power input terminal 8 and the negative terminal 9, so that the second moving contact 14 is connected with both the power input terminal 8 and the negative terminal 9 as an auxiliary connection, thereby making the switch have a greater current-carrying capacity.

[0088] During the process of pressing the trigger 35, the sliding reed 19 slides rightward on the circuit board 10, causing the output resistance signal on the circuit board 10 to change from large to small, and the voltage on the circuit board 10 connected to the switch also changes from low to high accordingly, thus realizing the speed regulation and voltage boosting function of the power tool.

[0089] When the trigger 35 is released, the push shaft 3 makes a reset slide leftward under the action of the reset spring 36. The second moving contact 14 separates from the power input terminal 8 and the negative terminal 9, causing the second moving contact 14 to disconnect from the power input terminal 8 and the negative terminal 9. Then the first moving contact 6 also slides leftward. When it exceeds the midpoint of the first moving contact 6, the first moving contact 6 will have a tipping movement downward, causing the first moving contact 6 to disconnect from the power input terminal 8, making the switch completely power off.

[0090] During the process of the first moving contact 6 moving leftward, it drives the brake pad 17 to move leftward, and further causes the moving contact holder 7 to connect with the brake terminal 18, realizing the braking function of the switch.

[0091] During the process of releasing the trigger 35, the sliding reed 19 slides leftward on the circuit board 10, causing the output resistance signal on the circuit board 10 to change from small to large, and the voltage on the circuit board 10 connected to the switch also changes from high to low accordingly, thus realizing the speed regulation and voltage reduction function of the power tool.

[0092] It should be noted that when the switch is applied to a brushless electric tool, since the characteristic of the brushless electric tool is to control the brake through an electronic circuit board, the switch does not need to be provided with a brake terminal 18 and a brake pad 17 .

[0093] When the switch is applied to a brushless electric tool, the first reversing disc 20 is rotated to drive the magnet seat 21 to rotate around the center of the first reversing disc 20. The magnet seat 21 is equipped with two first magnets 22 and second magnets 23 with opposite polarities. When the first reversing disc 20 is in the left direction, the first magnet 22 and the Hall element 24 on the circuit board 10 are in the same straight line, and the output of the Hall element 24 is a positive level. The first reversing disc 20 is rotated to the right by turning the protrusion on the first reversing disc 20. The first magnet 22 and the Hall element 24 on the circuit board 10 are misaligned, while the second magnet 23 and the Hall element 24 on the circuit board 10 are in the same straight line. Since the two magnets have opposite polarities, the output of the Hall element 24 becomes a negative level. Two sets of different level signals are output to the circuit board 10 to control the forward and reverse rotation of the brushless motor, thereby realizing the reversing function of the switch.

[0094] It can be understood that when the first reversing turntable 20 is located in the left direction, the first magnet 22 and the Hall element 24 on the circuit board 10 are in the same straight line, and the Hall element 24 can also output a positive level; when the protrusion on the first reversing turntable 20 is turned to the right direction, the first magnet 22 and the Hall element 24 on the circuit board 10 are misaligned, and the second magnet 23 and the Hall element 24 on the circuit board 10 are in the same straight line. Since the two magnets have opposite polarities, the output of the Hall element 24 can be a negative level, and the specific situation can be artificially specified.

[0095] When the switch is applied to a brushed power tool, the first reversing dial 28 is rotated to drive the small spring 28 and the reversing moving contact 23 to rotate around the center of the first reversing dial 28. When the first reversing dial 28 is located in the left direction, the reversing moving contact 23 contacts the first reversing terminal 29, the second reversing terminal 30, the third reversing terminal 31, and the fourth reversing terminal 32 respectively. The protrusion on the first reversing dial 28 is moved to the right to rotate the first reversing dial 28 to the right, and the reversing moving contact 23 contacts the first reversing terminal 29, the second reversing terminal 30, the third reversing terminal 31, and the fourth reversing terminal 32 respectively, thereby realizing the reversing function of the switch.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A DC trigger switch with a dual contact structure, characterized in that, The trigger switch includes a base body, an upper cover, and a push shaft; On the top of one side of the push shaft, a swing piece and a swing piece spring are provided. On the top of the swing piece, a first moving contact connected to the swing piece is provided. Above the first moving contact, a moving contact bracket and a power input terminal are provided. On the other side of the push shaft, a negative terminal is provided. One end of the first moving contact is arranged on the moving contact bracket; Above the push shaft, a circuit board is provided. One end of the moving contact bracket and one end of the negative terminal both pass through the circuit board and are connected through a connecting piece arranged on the circuit board; At the bottom of the push shaft, a slider connected to the push shaft is provided. On the slider, a moving contact spring is provided. One end of the moving contact spring is provided with a second moving contact; Moving contacts are provided on both the first moving contact and the second moving contact, and static contacts are provided on both the power input terminal and the negative terminal; The moving contact on the first moving contact cooperates with the bottom of the power input terminal; The moving contacts on the second moving contact respectively cooperate with the static contacts on the power input end and the negative terminal; 2. The DC trigger switch with a dual-contact structure according to claim 1, characterized in that: The other end of the moving contact spring is provided with a brake pad, and below the circuit board, a brake terminal connected to the circuit board is provided; 3. The DC trigger switch with a dual-contact structure according to claim 1 or 2, characterized in that: On the top of the push shaft, a sliding reed capable of sliding on the circuit board is provided; 4. A DC trigger switch with a dual-contact structure according to claim 1, characterized in that: Above the circuit board, a first commutation structure is provided. The first commutation structure includes: A first commutation turntable and a magnet seat arranged above the circuit board; Inside the magnet seat, a first magnet and a second magnet with opposite polarities are provided; At the position corresponding to the perpendicular bisector of the first magnet and the second magnet on the circuit board, a Hall element is provided; On the top of the magnet seat, a magnet seat spring is provided. On the top of the magnet seat, a ball spring is provided. Balls are provided at both ends of the ball spring; When the first commutation turntable is rotated so that the first magnet and the Hall element are on the same straight line, the Hall element outputs a positive level; When the first commutation turntable is rotated so that the second magnet and the Hall element are on the same straight line, the Hall element outputs a negative level; 5. The DC trigger switch with a dual-contact structure according to claim 2, characterized in that: Above the circuit board, a second commutation structure is provided. The second commutation structure includes: A second commutation turntable. At the bottom of the second commutation turntable, a first commutation terminal, a second commutation terminal, a third commutation terminal, and a fourth commutation terminal are provided; On the top of both the first commutation terminal and the third commutation terminal, commutation moving contacts are provided. Above the commutation moving contacts, commutation moving contact springs are provided; A ball spring is provided between the two commutation moving contacts. Balls are provided at both ends of the ball spring; 6. A DC trigger switch having a dual-contact structure according to claim 1 or 2, characterized in that: At the bottom of the push shaft, a first cavity is provided. The slider is arranged in the first cavity; On the slider, a second cavity is provided. The second moving contact and the moving contact spring are both arranged in the second cavity; 7. A DC trigger switch having a dual-contact structure according to claim 1 or 2, characterized in that: On one side of the push shaft, a boss is provided. On the boss, a swing piece slot is provided. The swing piece and the swing piece spring are both arranged in the swing piece slot.

8. A DC trigger switch having a dual contact structure according to claim 1 or 2, characterized in that: One end of the swing piece close to the first moving contact is provided with a first clamping block, and a clamping hole is arranged on the first moving contact, and the first clamping block is clamped in the clamping hole.

9. The DC trigger switch with a dual-contact structure according to claim 3, characterized in that: A push shaft groove is arranged at the top of the push shaft; A fixing column is arranged at the center of the push shaft groove, and clamping grooves are arranged on both sides of the push shaft; A fixing hole is arranged at the center of the sliding spring piece, and second clamping blocks are arranged on both sides of the sliding spring piece; The fixing column is clamped in the fixing hole, and the second clamping block is clamped in the clamping groove.

10. A DC trigger switch with a dual-contact structure according to claim 1 or 2, characterized in that: One end of the push shaft extending out of the base body is provided with a trigger, the other end is provided with a push shaft through hole, a positioning column is arranged in the push shaft through hole, and a return spring is arranged on the positioning column.

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