A power tool switch with redundant contacts

Abstract

This invention relates to the field of power tool switch technology, specifically a redundant contact power tool switch, comprising a housing, a mounting structure, a control structure, a sealing structure, a drive structure, and a triggering structure. The triggering structure achieves dual-point contact, and the redundant contact system design avoids poor contact caused by wear of a single contact point, eliminating the need for repeated disassembly and repair, thus improving practicality. Furthermore, the moving and stationary contacts are less prone to detachment, ensuring high stability. The sealing structure guarantees the overall sealing of the switch's interior, preventing dust from entering and causing poor contact, and also preventing the sealing ring at the button-housing connection from easily detaching. The control structure enables switching between switching mode and speed adjustment mode, allowing for speed adjustment of the power tool by pressing a button, providing high flexibility.

Description

Technical Field

[0001] This invention relates to the field of power tool switch technology, specifically a power tool switch with redundant contacts. Background Technology

[0002] The power tool switch is a core control component used to control the power supply of power tools, adjust the output power, or change the operating mode. It mainly moves the internal switching plate by pressing, which connects or disconnects the moving contact with the stationary contact, or changes the contact position on the copper mold, thereby controlling the current flow or adjusting the motor current and voltage, and ultimately realizing functions such as tool start / stop, speed adjustment, and mode switching.

[0003] Traditional switches rely on pressing a button to make the moving contact on the switching plate directly contact the stationary contact inside the switch, thereby starting or stopping the power tool or adjusting its speed. However, because power tools continuously generate high-frequency vibrations during operation, the moving and stationary contacts are prone to detachment or wear, which can lead to problems such as contact system failure and speed control failure. Furthermore, when the contacts are worn, the switch needs to be repeatedly disassembled for repair or replacement, which is cumbersome and inflexible.

[0004] The switching plate inside the switch is usually moved directly by the push rod. In order to avoid the problem of poor contact caused by dust entering the switch, a rubber ring is usually put on the outer end of the push rod. However, the rubber ring is prone to falling off or shifting during repeated pushing of the push rod, resulting in poor sealing effect inside the switch and poor applicability.

[0005] When power tools are accidentally dropped to the ground, the switch cover is usually directly clamped to the outer casing, which can easily cause the cover to fall off the casing, resulting in loose or detached internal parts and poor usability. Summary of the Invention

[0006] To address the problems in the prior art, the present invention provides a power tool switch with redundant contacts.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a power tool switch with redundant contact, including a housing, a mounting structure mounted on the housing, a sealing structure connected to the housing, a driving structure disposed on the sealing structure, and a triggering structure disposed on the mounting structure;

[0008] The mounting structure includes a mounting base, which is engaged with the bottom of the housing. The triggering structure includes a first switching plate and two protrusions fixedly connected to the first switching plate. The first switching plate is slidably connected to the mounting base. The end of the first switching plate is slidably connected to the housing. A tension spring is fixedly connected between the first switching plate and the mounting base. A first terminal piece and a second terminal piece are engaged with the mounting base and the housing respectively. The first switching plate is slidably connected to the first terminal piece. A second switching plate and a third switching plate are slidably connected to both sides of the second terminal piece. Both the second and third switching plates are slidably connected to the mounting base. A spring is fixedly connected to the end of both the second and third switching plates to the housing. A main contact and a secondary contact are fixedly connected to the other end of the second and third switching plates respectively. The main contact abuts against the adjacent protrusion. The driving structure includes a push rod, which is slidably connected between the housing and the mounting base. The end of the push rod abuts against the first switching plate.

[0009] Specifically, two contact pieces are fixedly connected to the other end of the first switching piece, and copper molds are provided on the side of the contact pieces.

[0010] Specifically, the raised portion of the protrusion is a semi-circular structure, the cross-section of the main contact and the auxiliary contact is a "V" shape, the first terminal piece is an "L" shape, the second terminal piece is a "T" shape, the second switching piece and the third switching piece are both "U" shaped, and a second wire is fixedly connected to both the first terminal piece and the second terminal piece.

[0011] Specifically, the card holder has a card cover that engages with it, two first protrusions are fixedly connected to the card holder, and two first card slots are formed on the housing. The first protrusions engage with the adjacent first card slots.

[0012] Specifically, a control structure is installed on the card holder. The control structure includes a motherboard and multiple first wires fixedly connected to the bottom of the motherboard. The motherboard is engaged with the card holder. Both sides of the motherboard abut against the housing. The first wires abut against the card cover and are engaged with the side wall of the housing.

[0013] Specifically, the card slot has a conversion switch engaged, with the two sides of the conversion switch abutting against the motherboard and the housing respectively. A rotating plate is rotatably connected to the housing near the conversion switch, and the rotating plate engages with the corresponding groove on the conversion switch.

[0014] Specifically, two sets of copper molds are fixedly connected to the side of the motherboard near the first switching piece, and the copper molds are slidably connected to the adjacent contact pieces.

[0015] Specifically, the sealing structure includes a top cover and two second protrusions fixedly connected to the top cover. The top cover is engaged with the top of the housing, and two second slots are provided on the housing. The second protrusions engage with the adjacent second slots.

[0016] Specifically, a base is fixedly connected to the housing, and a top seat is fixedly connected to the top cover near the base. The base and the top seat abut against each other, and a connecting cover is threadedly connected between the base and the top seat.

[0017] Specifically, a rubber sleeve engages between the base and the top seat, the rubber sleeve abuts against the connecting cover, a positioning sleeve is fixedly connected to the base, a push rod is slidably connected between the base and the positioning sleeve, the push rod is slidably connected to the rubber sleeve, the push rod is slidably connected to both the top seat and the connecting cover, a button is fixedly connected to the outer end of the push rod, a stop is fixedly connected to the inner section of the push rod, and the stop is slidably connected to the top cover.

[0018] The beneficial effects of this invention are:

[0019] (1) The redundant contact power tool switch of the present invention has an installation structure on the housing, and a trigger structure is connected to the installation structure. The trigger structure is used in conjunction with the drive structure. The setting of the trigger structure realizes double-point contact. The design of the redundant contact system avoids the problem of poor contact due to wear of a single contact point, avoids the problem of repeatedly disassembling the switch for maintenance, improves practicality, and at the same time, the moving and stationary contacts are not easy to fall off when in contact, and have strong stability.

[0020] (2) The redundant contact power tool switch of the present invention has a sealing structure on the housing. The sealing structure is used in conjunction with the drive structure. The sealing structure ensures the overall sealing of the switch, avoids dust from entering the switch and causing poor contact, and also avoids the problem of the sealing ring at the connection between the button and the housing easily falling off.

[0021] (3) The redundant contact power tool switch of the present invention has a control structure installed inside the housing. The control structure enables the switching between the switching mode and the speed adjustment mode. The speed of the power tool can be adjusted by pressing the button, which is highly flexible. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the connection structure between the housing and the card holder of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection structure between the top cover and the second protrusion of the present invention;

[0026] Figure 4 This is a schematic diagram of the connection structure between the card holder and the card block of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection structure between the base and the positioning sleeve of the present invention;

[0028] Figure 6 This is a schematic diagram of the connection structure between the push rod and the first switching plate of the present invention;

[0029] Figure 7 This is a schematic diagram of the connection structure between the housing and the second terminal piece of the present invention;

[0030] Figure 8 for Figure 7 The diagram shown is an enlarged view of the structure of part A.

[0031] Figure 9 This is a schematic diagram of the connection structure between the housing and the top cover of the present invention;

[0032] Figure 10 for Figure 9 The diagram shown is an enlarged view of the structure of section B.

[0033] Figure 11 This is a schematic diagram of the connection structure between the push rod and the button of the present invention;

[0034] Figure 12 for Figure 11 The diagram shown is an enlarged view of the C-section structure.

[0035] Figure 13 This is a schematic diagram of the connection structure between the housing and the card block of the present invention;

[0036] Figure 14 This is a schematic diagram of the connection structure between the card holder and the first switching plate of the present invention.

[0037] In the diagram: 1. Housing; 2. Mounting structure; 201. Card holder; 202. First protrusion; 203. First card slot; 204. Card cover; 3. Control structure; 301. Main board; 302. First wire; 303. Shift gear; 304. Rotating plate; 4. Sealing structure; 401. Top cover; 402. Second protrusion; 403. Second card slot; 404. Base; 405. Top seat; 406. Connecting cover; 5. Drive structure; 501. 502. Push rod; 503. Stop block; 504. Button; 505. Rubber sleeve; 506. Positioning sleeve; 6. Trigger structure; 601. First switching piece; 602. Protrusion; 603. Tension spring; 604. First terminal piece; 605. Second terminal piece; 606. Second switching piece; 607. Main contact; 608. Spring; 609. Third switching piece; 610. Secondary contact; 611. Contact piece; 612. Copper mold; 613. Second wire. Detailed Implementation

[0038] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0039] like Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figures 9-14 As shown, the redundant contact power tool switch of the present invention includes a housing 1, a mounting structure 2 mounted on the housing 1, a sealing structure 4 connected to the housing 1, a driving structure 5 disposed on the sealing structure 4, and a triggering structure 6 disposed on the mounting structure 2. The mounting structure 2 includes a card holder 201, which is engaged with the bottom of the housing 1. A cover 204 is engaged with the card holder 201. The cover 204 facilitates the subsequent installation of the main board 301 and the first wire 302. Two first protrusions 202 are fixedly connected to the card holder 201. Two first slots 203 are opened on the housing 1. The card holder 201 is engaged with the two first slots 203 at the bottom of the housing 1 by means of the first protrusions 202 fixed on both sides, thereby achieving the initial fixation of the card holder 201 and the housing 1. The first protrusions 202 and the adjacent first slots 203 engage with each other. Then, screws are tightened to fix it, which is very firm. Then, the cover 204 is engaged with the card holder 201 to protect the internal components of the card holder 201.

[0040] Specifically, such as Figure 1 , Figure 2 , Figure 6 , Figure 7 , Figure 9 and Figures 1-14As shown, the trigger structure 6 includes a first switching piece 601 and two protrusions 602 fixedly connected to the first switching piece 601. The first switching piece 601 is slidably connected to the card holder 201. The end of the first switching piece 601 is slidably connected to the housing 1. A tension spring 603 is fixedly connected between the first switching piece 601 and the card holder 201. A first terminal piece 604 and a second terminal piece 605 are respectively engaged between the card holder 201 and the housing 1. The first switching piece 601 is slidably connected to the first terminal piece 604. A second switching piece 606 and a third switching piece 609 are slidably connected to both sides of the second terminal piece 605. Both the second switching piece 606 and the third switching piece 609 are slidably connected to the card holder 201. The first terminal piece 604 is in the shape of an "L". The switch has a "T" shaped structure, with the second terminal piece 605 in a "T" shape and the second switching piece 606 and the third switching piece 609 both in a "U" shape. Springs 608 are fixedly connected to the ends of the second and third switching pieces 606 and 609, respectively. A main contact 607 and an auxiliary contact 610 are fixedly connected to the other ends of the second and third switching pieces 606 and 609, respectively. The main contact 607 abuts against the adjacent protrusion 602. After assembling the entire switch, it is installed in the designated position on the power tool. During use, to start the power tool and adjust the speed, press button 503, which moves the push rod 501 along the sliding channel of the positioning sleeve 505, rubber sleeve 504, and other components into the housing 1. When the push rod 501 is activated, it pushes the first switching plate 601, causing the first switching plate 601 to slide between the card holder 201 and the housing 1. At this time, the tension spring 603 fixed between the first switching plate 601 and the card holder 201 is stretched and stored. During the sliding process, one side of the first switching plate 601 maintains sliding contact with the first terminal piece 604, ensuring that the first switching plate 601 and the first terminal piece 604 always remain in a conductive state. At the same time, one of the protrusions 602 on the first switching plate 601 first abuts against the main contact 607 at the end of the second switching plate 606. The semi-circular protrusion 602 and the inner wall of the "V"-shaped main contact 607 always maintain double-point contact, resulting in good contact effect. At this time, the current flows through the first terminal piece 604, the first switching plate 601, the protrusion 602, and the main contact. The signal is transmitted to the power tool motor via point 607, the second terminal piece 605, and the second wire 613 fixed on the second terminal piece 605, thus starting the motor. The protruding part of the protrusion 602 has a semi-circular structure. The cross-section of both the main contact 607 and the auxiliary contact 610 has a "V" shape. The other end of the first switching piece 601 is fixedly connected to two contact pieces 611. The side of the contact piece 611 is provided with a copper mold 612. The second wire 613 is fixedly connected to both the first terminal piece 604 and the second terminal piece 605. During this process, the first switching piece 601 drives the two contact pieces 611 to move on the first set of copper molds 612 on the main board 301. When it is necessary to adjust the speed, simply continue pressing. Through the contact of the contact piece 611 with different positions on the copper mold 612,By changing the circuit resistance, and thus adjusting the motor input current and voltage, the motor speed can be controlled.

[0041] Specifically, such as Figures 1-11 and Figure 13 As shown, the sealing structure 4 includes a top cover 401 and two second protrusions 402 fixedly connected to the top cover 401. The top cover 401 is engaged with the top of the housing 1. Two second slots 403 are provided on the housing 1. The second protrusions 402 engage with the adjacent second slots 403. A base 404 is fixedly connected to the housing 1. A top seat 405 is fixedly connected to the top cover 401 near the base 404. The base 404 and the top seat 405 abut against each other. Then, the top cover 401 is engaged with the two second protrusions 402 fixed at its bottom and the two second slots 403 at the top of the housing 1, so that the top cover 401 covers the top opening of the housing 1. Then, the housing 1 is closed. The base 404 fixed on the outer wall is aligned and abuts against the top seat 405 fixed on the top cover 401. The connecting cover 406 is fitted onto the outside of the base 404 and the top seat 405. The base 404 and the top seat 405 are fastened by threaded connection. At this time, the tight connection between the shell 1 and the top cover 401 is completed, which is strong. The connecting cover 406 is threaded between the base 404 and the top seat 405. During this process, a rubber sleeve 504 is inserted into the gap between the base 404 and the top seat 405. The setting of the rubber sleeve 504 ensures the sealing of the inside of the shell 1 and prevents dust from entering the internal cavity of the shell 1. At the same time, since the outer side of the rubber sleeve 504 abuts against the inner wall of the connecting cover 406, it is not easy to fall off.

[0042] Specifically, such as Figure 1 and Figures 5-12As shown, the drive structure 5 includes a push rod 501. The push rod 501 is slidably connected between the housing 1 and the card holder 201. The end of the push rod 501 abuts against the first switching piece 601. A rubber sleeve 504 is engaged between the base 404 and the top seat 405. The rubber sleeve 504 abuts against the connecting cover 406. A positioning sleeve 505 is fixedly connected to the base 404. The push rod 501 is slidably connected between the base 404 and the positioning sleeve 505. The push rod 501 is slidably connected to the rubber sleeve 504. The push rod 501 is slidably connected to both the top seat 405 and the connecting cover 406. A button 503 is fixedly connected to the outer end of the push rod 501. A stop block 502 is fixedly connected to the inner section of the push rod 501. The stop block 502 is slidably connected to the top cover 401. After the installation of the trigger component is completed, the push rod 501 needs to be installed. The push rod 501 is inserted into the center of the connecting cover 406 and the rubber sleeve 504 in sequence until the inner end of the push rod 501 abuts against the first switching piece 601. At the same time, it is ensured that the stop block 502 fixed on the inner section of the push rod 501 slides and adapts to the inner wall of the top cover 401. At this time, the push rod 501 rests between the card seat 201 and the base 404. Then, the positioning sleeve 505 is snapped on the base 404. The installation of the positioning sleeve 505 realizes the initial positioning of the push rod 501. Finally, the button 503 is fixed on the outer end of the push rod 501 to complete the assembly of the internal drive component of the switch.

[0043] Specifically, such as Figure 1 , Figure 2 , Figure 4 , Figure 7 , Figure 9 and Figures 11-13As shown, a control structure 3 is installed on the card slot 201. The control structure 3 includes a main board 301 and multiple first wires 302 fixedly connected to the bottom of the main board 301. The main board 301 is engaged with the card slot 201, with both sides of the main board 301 abutting against the housing 1. The first wires 302 abut against the card cover 204 and are engaged with the side wall of the housing 1. A shift stop 303 is engaged with the card slot 201, with both sides of the shift stop 303 abutting against the main board 301 and the housing 1 respectively. A rotating plate 304 is rotatably connected to the housing 1 near the shift stop 303. The rotating plate 304 engages with the corresponding groove on the shift stop 303, engaging the main board 301 within the card slot 201 and ensuring that both sides of the main board 301 are in tight contact with the inner wall of the housing 1. Then, the shift stop 303 is engaged with the card slot 201. On the 01, one side of the switch plate 301 is pressed against the main board 301, and the other side is attached to the inner wall of the housing 1. The rotating plate 304 on the housing 1 is rotated so that the rotating plate 304 is inserted into the corresponding groove on the shift switch 303, thus completing the positioning of the shift switch 303. At the same time, the multiple first wires 302 at the bottom of the main board 301 are inserted into the slots on the side wall of the housing 1 so that their ends press against the cover 204. At this time, the installation of the main board 301 and the shift switch 303 is completed. Two sets of copper molds 612 are fixedly connected to the side of the main board 301 near the first switching plate 601. The copper molds 612 are slidably connected to the adjacent contact plates 611. In subsequent use, by rotating the rotating plate 304, the contact state with the circuit of the main board 301 is changed, thereby changing the direction of the motor magnetic field, thus realizing the forward and reverse rotation of the power tool, which is highly flexible.

[0044] In use, the card holder 201 is engaged with the two first slots 203 at the bottom of the housing 1 via the first protrusions 202 fixed on both sides, achieving initial fixation between the card holder 201 and the housing 1. Screws are then tightened for secure fixation. Next, the card cover 204 is engaged with the card holder 201, protecting the internal components and facilitating subsequent installation of the motherboard 301 and the first wire 302. The motherboard 301 is then engaged within the card holder 201, ensuring tight contact between both sides of the motherboard 301 and the inner wall of the housing 1. Finally, the shift switch 303 is engaged with the card holder 201, with one side contacting the motherboard 301 and the other side against the inner wall of the housing 1. The housing is then rotated... The rotating plate 304 on body 1 is inserted into the corresponding groove on the shift switch 303 to complete the positioning of the shift switch 303. At the same time, the multiple first wires 302 at the bottom of the main board 301 are inserted into the slots on the side wall of the housing 1 so that their ends abut against the cover 204. At this time, the installation of the main board 301 and the shift switch 303 is completed. In subsequent use, by rotating the rotating plate 304, the contact state with the circuit of the main board 301 is changed, thereby changing the direction of the motor magnetic field, so as to realize the forward and reverse rotation of the power tool, which is highly flexible. Then, the first terminal piece 604 and the second terminal piece 605 are respectively engaged in the designated positions on the card holder 201. Then, other trigger components can be connected as required.

[0045] After the installation of the trigger component is completed, the push rod 501 needs to be installed. The push rod 501 is inserted into the center of the connecting cover 406 and the rubber sleeve 504 in sequence until the inner end of the push rod 501 abuts against the first switching piece 601. At the same time, it is ensured that the stop block 502 fixed on the inner section of the push rod 501 slides and adapts to the inner wall of the top cover 401. At this time, the push rod 501 rests between the card seat 201 and the base 404. Then, the positioning sleeve 505 is snapped on the base 404. The installation of the positioning sleeve 505 realizes the initial positioning of the push rod 501. Finally, the button 503 is fixed on the outer end of the push rod 501 to complete the assembly of the internal drive component of the switch.

[0046] Next, the top cover 401 is engaged with the two second protrusions 402 fixed at its bottom and the two second slots 403 on the top of the housing 1, so that the top cover 401 covers the top opening of the housing 1. Then, the base 404 fixed on the outer wall of the housing 1 is aligned and abutted with the top seat 405 fixed on the top cover 401. The connecting cover 406 is put on the outside of the base 404 and the top seat 405, and the base 404 and the top seat 405 are fastened by the threaded connection. At this time, the housing 1 and the top cover 401 are fastened together, which is very strong. During this process, a rubber sleeve 504 is inserted into the gap between the base 404 and the top seat 405. The rubber sleeve 504 ensures the sealing of the inside of the housing 1 and prevents dust from entering the internal cavity of the housing 1. At the same time, since the outer side of the rubber sleeve 504 abuts against the inner wall of the connecting cover 406, it is not easy to fall off.

[0047] After assembling the switch, install it in the designated position on the power tool. During use, to start the power tool and adjust the speed, press button 503. This moves push rod 501 along the sliding channel of components such as positioning sleeve 505 and rubber sleeve 504 into the housing 1. The end of push rod 501 pushes the first switching piece 601, causing it to slide between the card holder 201 and the housing 1. At this time, the tension spring 603 fixed between the first switching piece 601 and the card holder 201 is stretched and stores force. During the sliding process, one side of the first switching piece 601 maintains sliding contact with the first terminal piece 604, ensuring that the first switching piece 601 and the first terminal piece 604 remain in a conductive state. Simultaneously, one of the protrusions on the first switching piece 601... 602 first contacts the main contact 607 at the end of the second switching piece 606. The semi-circular protrusion 602 and the inner wall of the "V"-shaped main contact 607 always maintain double-point contact, resulting in good contact effect. At this time, the current passes through the first terminal piece 604, the first switching piece 601, the protrusion 602, the main contact 607, and the second terminal piece 605, and then through the second wire 613 fixed on the second terminal piece 605 to the power tool motor, realizing the motor start-up. During this process, the first switching piece 601 drives the two contact pieces 611 to move on the first set of copper molds 612 on the main board 301. When it is necessary to adjust the speed, just continue to press. By contacting the contact pieces 611 with different positions on the copper molds 612, the circuit resistance is changed, thereby adjusting the motor input current and voltage to realize speed adjustment.

[0048] If the main contact 607 experiences poor contact due to wear or other reasons, continue pressing button 503 to further push the push rod 501 to slide the first switching plate 601. At this time, the first switching plate 601 pushes the second switching plate 606 to slide on the second terminal piece 605, compressing the spring 608 fixed between the end of the second switching plate 606 and the housing 1, until another protrusion 602 on the first switching plate 601 abuts against the "V"-shaped auxiliary contact 610 at the end of the third switching plate 609, compressing the spring 608 fixed between the end of the third switching plate 609 and the housing 1. At this time, a redundant conductive path is formed to ensure stable current transmission and prevent the tool from stopping. Since the main board 301 is equipped with two sets of identical copper molds 612, when the protrusion 602 and the auxiliary contact 610 are connected, continuing to press button 503 can make the contact piece 611 slide on the other set of copper molds 612, thereby ensuring that the speed can still be adjusted even if the main contact 607 is damaged.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider 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 redundant contact power tool switch comprising a housing (1), characterized in that: The mounting structure (2) is mounted on the shell (1), the sealing structure (4) is connected to the shell (1), the driving structure (5) is arranged on the sealing structure (4), and the trigger structure (6) is arranged on the mounting structure (2). The mounting structure (2) comprises a clamping seat (201), the bottom of the shell (1) is clamped with the clamping seat (201), the trigger structure (6) comprises a first switching piece (601) and two protrusions (602) fixedly connected to the first switching piece (601), the first switching piece (601) is slidably connected to the clamping seat (201), the end of the first switching piece (601) is slidably connected to the shell (1), the clamping seat (201) and the shell (1) are clamped with a first terminal piece (604) and a second terminal piece (605) respectively, the first switching piece (601) is slidably connected to the first terminal piece (604), the two sides of the second terminal piece (605) are slidably connected with a second switching piece (606) and a third switching piece (609) respectively, the second switching piece (606) and the third switching piece (609) are slidably connected to the clamping seat (201), the ends of the second switching piece (606) and the third switching piece (609) are fixedly connected with a spring (608) between the second switching piece (606) and the third switching piece (609) and the shell (1), the other end of the second switching piece (606) and the third switching piece (609) is fixedly connected with a main contact (607) and a secondary contact (610) respectively, the main contact (607) and the adjacent protrusion (602) are in contact with each other, the driving structure (5) comprises a push rod (501), the push rod (501) is slidably connected between the shell (1) and the clamping seat (201), and the end of the push rod (501) is in contact with the first switching piece (601).

2. A redundant contact power tool switch according to claim 1, wherein: The other end of the first switching piece (601) is fixedly connected with two contact pieces (611), and the side of the contact piece (611) is provided with a copper mold (612).

3. A redundantly contacted power tool switch according to claim 1, wherein: The protruding part of the protrusion (602) is a semicircular structure, the cross section of the main contact (607) and the secondary contact (610) is a "V" shaped structure, the first terminal piece (604) is an "L" shaped structure, the second terminal piece (605) is a "T" shaped structure, the second switching piece (606) and the third switching piece (609) are both "U" shaped structures, and the first terminal piece (604) and the second terminal piece (605) are fixedly connected with a second wire (613).

4. A redundantly contacted power tool switch according to claim 1, wherein: The clamping seat (201) is clamped with a clamping cover (204), the clamping seat (201) is fixedly connected with two first protrusions (202), and the shell (1) is provided with two first clamping grooves (203), the first protrusion (202) and the adjacent first clamping groove (203) are clamped with each other.

5. A redundantly contacted power tool switch according to claim 4, wherein: The control structure (3) is installed on the card seat (201), the control structure (3) comprises a mainboard (301) and a plurality of first wires (302) fixedly connected with the bottom of the mainboard (301), the mainboard (301) is clamped on the card seat (201), and the two sides of the mainboard (301) abut against the shell (1); the first wires (302) abut against the cover (204), and the first wires (302) are clamped on the side wall of the shell (1).

6. A redundantly contacted power tool switch according to claim 5, wherein: The conversion gear (303) is clamped on the card seat (201), the two sides of the conversion gear (303) abut against the mainboard (301) and the shell (1) respectively, the shell (1) is rotationally connected with a rotating piece (304) at a position close to the conversion gear (303), and the rotating piece (304) and the corresponding grooves on the conversion gear (303) are clamped on each other.

7. A redundantly contacted power tool switch according to claim 5, wherein: Two groups of copper modes (612) are fixedly connected to one side of the mainboard (301) close to the first switching piece (601), and the copper modes (612) are slidably connected with the adjacent contact pieces (611).

8. A redundantly contacted power tool switch according to claim 6, wherein: The sealing structure (4) comprises a top cover (401) and two second protrusions (402) fixedly connected to the top cover (401), the top cover (401) is clamped on the top of the shell (1), two second clamping grooves (403) are formed in the shell (1), and the second protrusions (402) and the adjacent second clamping grooves (403) are clamped on each other.

9. A redundantly contacted power tool switch according to claim 8, wherein: The shell (1) is fixedly connected with a base (404), the top cover (401) is fixedly connected with a top seat (405) at a position close to the base (404), the base (404) and the top seat (405) abut against each other, and the base (404) and the top seat (405) are threadedly connected with a connecting cover (406).

10. A redundant contact power tool switch according to claim 9, wherein: The base (404) and the top seat (405) are clamped with a rubber sleeve (504), the rubber sleeve (504) abuts against the connecting cover (406), the base (404) is fixedly connected with a positioning sleeve (505), the base (404) and the positioning sleeve (505) are slidably connected with a push rod (501), the push rod (501) and the rubber sleeve (504) are slidably connected, the push rod (501) and the top seat (405) and the connecting cover (406) are slidably connected, the outer side end of the push rod (501) is fixedly connected with a button (503), the inner side section of the push rod (501) is fixedly connected with a stop block (502), and the stop block (502) and the top cover (401) are slidably connected.

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