A power tool signal switch

Abstract

This utility model relates to a power tool signal switch, including an upper shell and a lower shell. An internal reversing mechanism is located on the top of the upper shell, with its operating handle protruding from the top. The lower side of the reversing mechanism connects to the upper side of a PCB board. A switch slide assembly and a switch on / off mechanism are located on the lower side of the PCB board. The front end of the switch slide assembly extends beyond the right side of both the upper and lower shells. A first waterproof and dustproof mechanism is provided between the reversing mechanism and the upper shell. A second waterproof and dustproof mechanism is provided on the switch slide assembly. A third waterproof and dustproof mechanism is provided between the upper and lower shells. This solution effectively improves waterproof and dustproof functionality, significantly enhancing the safety and stability of the power tool. This utility model, while retaining two existing sets of contact signals, adds another set of contact signals to the side of the switch, significantly increasing the switch's application current. This solution can handle a wider range of application environments. This solution is simple in structure, compact, and reliable.

Description

Technical Field

[0001] This utility model relates to the field of power tool product technology, and in particular to a power tool signal switch. Background Technology

[0002] Power tools offer numerous advantages, including ease of operation, high efficiency, labor saving, and time saving. Handheld power tools are gradually replacing manual tools and are widely used. Power tools typically include a motor commutation mechanism. Most existing commutation mechanisms are protruding switch bodies, increasing overall size, occupying tool design space, and being susceptible to damage from external impacts. This not only affects the stability and reliability of the commutation but may also pose safety hazards. Furthermore, the installation method of these protruding switch bodies is often through-clip or riveted, making it easy for external water droplets and dust to enter. In addition, most existing power tool signal switches use sliding contacts to contact the PCB or small spring contacts, which have limited current carrying capacity and are unsuitable for applications requiring higher current (such as 1A). To overcome these problems, we have invented a power tool signal switch. Utility Model Content

[0003] The purpose of this invention is to solve the problems of existing power tools where the reversing mechanism protrudes from the switch body, occupying tool design space, being easily damaged by external impacts, allowing water droplets and dust to enter, and potentially posing safety hazards; and the limited current carrying capacity of the sliding contact plate in contact with the PCB or small spring contact. The specific solution is as follows: A power tool signal switch includes an upper housing and a lower housing. The top of the upper housing is provided with an internal reversing mechanism. The operating handle of the reversing mechanism protrudes from the top of the upper housing. The lower side of the reversing mechanism is connected to the upper side of a PCB board. The lower side of the PCB board is provided with a switch slide assembly and a switch on / off mechanism. The front end of the switch slide assembly extends out to the right side of the upper and lower housings. A first waterproof and dustproof mechanism is provided between the reversing mechanism and the upper housing. A second waterproof and dustproof mechanism is provided on the switch slide assembly. A third waterproof and dustproof mechanism is provided between the upper and lower housings.

[0004] Furthermore, the reversing mechanism includes a rotating cover and a reversing core assembly disposed on the lower side of the rotating cover, and a reversing spring disposed on the lower side of the reversing core assembly, and the operating handle is disposed on the upper surface of the rotating cover.

[0005] Furthermore, the commutator assembly includes a commutator, a first spring laterally sleeved inside the commutator, and two ball bearings disposed at both ends of the first spring.

[0006] Furthermore, the rotating cover has a shaft hole at the center of its lower side, and a pin on each side of the shaft hole. The reversing core has an upwardly protruding rotating shaft on its upper side, and a pin hole on each side of the rotating shaft. The rotating shaft matches and is sleeved with the shaft hole, and the pin matches and is sleeved with the pin hole.

[0007] Furthermore, two fixing posts are provided on the lower side of the commutation core, which fix the commutation spring piece.

[0008] Furthermore, the lower side of the reversing spring is provided with multiple protruding contacts, and the operation handle can be turned to make the protruding contacts electrically connected to the reversing contact plate on the upper side of the PCB board.

[0009] Furthermore, the switch slide assembly includes a switch slide, a button sleeved on the front end of the switch slide, a second spring sleeved on the rear end of the switch slide, and a positioning post sleeved on the rear end of the second spring. The rear end of the positioning post is provided with a concave hole and matches the protrusion on the lower shell.

[0010] Furthermore, a spring plate fixing platform is provided on the upper side of the middle part of the switch slide rod, and multiple sets of sliding contact spring plates are fixed on the spring plate fixing platform. The rear part of the switch slide rod is a slide table, and a switching step matching the switch switching mechanism is provided on one side of the slide table.

[0011] Furthermore, the switch-on / off mechanism includes a fixed bracket, a movable terminal with one end sleeved on the hook of the fixed bracket, the other end of the movable terminal being electrically connected to the contact of the fixed terminal, a third spring being provided between the upper side of the movable terminal and the upper part of the fixed bracket, the upper ends of the fixed bracket and the fixed terminal being soldered to the PCB board, and the lower end of the fixed bracket being inserted into the slot of the lower shell.

[0012] Furthermore, the upper shell is provided with a circular groove that matches the contour of the rotating cover, and a through hole is provided in the center of the circular groove. The first waterproof and dustproof mechanism is a multi-level concave-convex structure provided between the lower side of the rotating cover and the upper side of the circular groove, including at least two water-retaining rings that rise progressively from the outside to the inside. The third waterproof and dustproof mechanism is a groove provided on the lower edge of the upper shell and a convex edge provided on the upper edge of the lower shell, with the convex edge matching the groove. The upper shell and the lower shell are closed by multiple snaps.

[0013] In summary, the technical solution of this utility model has the following beneficial effects: This invention proposes a reversing mechanism that is completely integrated within the switch housing. The outer surface only has a raised operating handle for power tool reversing. This reversing mechanism is flat and has no exposed holes. This built-in design ensures a smooth reversing component, abandoning the existing through-type reversing mechanisms assembled using snap-fit ​​or riveting methods. In this solution, the reversing mechanism uses a pin on the lower side of a rotating cover integrated with the operating handle to drive the reversing core assembly. The first spring on the lower side of the reversing core assembly connects with the reversing contact plate on the upper side of the PCB board to achieve the reversing function. This solution features a multi-stage concave-convex mechanism between the adjustment cover and the upper shell as the first level of waterproofing and dustproofing. The switch slide has a second level of waterproofing and dustproofing, and a third level at the junction of the upper and lower shells, effectively improving waterproofing and dustproofing, and significantly enhancing the safety and stability of the power tool. This invention retains two existing sets of contact signals while adding another set of contact signals on the side of the switch (i.e., this solution designs two sets of sliding contact springs and sliding contact strips), which significantly increases the application current of the switch. This solution can be used in a wider range of application environments. In summary, this solution has a simple, compact structure, multiple waterproof and dustproof mechanisms, and is safe and reliable. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort. Figure 1 This is a structural diagram of a signal switch for an electric tool according to the present invention. Figure 2 for Figure 1 The exploded diagram, Figure 3 for Figure 1 Cross-sectional view along line AA Figure 4 This is a structural diagram of the rotating cover of this utility model. Figure 5 This is a structural diagram of the commutation core of this utility model. Figure 6 This is an assembly structure diagram of the commutator core and commutator spring of this utility model. Figure 7 This is a structural diagram of the upper shell of this utility model. Figure 8 This is a diagram showing the internal structure of the upper shell of this utility model. Figure 9 This is a structural diagram of the lower shell of this utility model. Figure 10 This is an exploded view of the switch slider and sliding contact spring of this utility model. Figure 11 This is an exploded view of the switch slide rod with sliding contact spring and the PCB board of this utility model. Figure 12 This is a structural diagram of the switch slide rod assembly and switch on / off mechanism of this utility model in the power-off state. Figure 13 This is a structural diagram of the switch slide rod assembly and switch on / off mechanism of this utility model in the energized state. Figure 14 This is an assembly structure diagram of the PCB board and the switch on / off mechanism of this utility model. Figure 15 This is an assembly structure diagram of the PCB board and the upper shell of this utility model.

[0015] Explanation of reference numerals in the attached figures: 10-Upper shell, 11-Reversing stop groove, 12-Positioning package, 13-Snap block, 14-Round groove, 140-Through hole, 15-Concave-convex structure, 151-Water-blocking ring one, 152-Water-blocking ring two, 16-Groove, 17-Clamping block, 18-Lead wire port, 19-Rotation limiting groove, 20-Lower shell, 21-Protruding post, 22-Slot, 23-Protruding edge, 24-Clamping opening, 25-Limiting strip, 30-Rotating cover, 301-Shaft hole, 302-Pin, 303-Concave arc groove, 31-Operating handle, 32-Reversing spring, 320-Post hole, 321-Protruding contact, 33-Reversing core, 331-Rotating shaft, 332-Pin hole, 333-Fixing post, 334-Protruding arc block, 335-Positioning Block, 34-First Spring, 35-Ball, 40-PCB Board, 41-Reversing Contact Plate, 42-Sliding Contact Strip, 43-Ribbon Cable, 50-Switch Slide Rod, 501-Spring Fixing Platform, 5011-Fixing Slot, 5012-Fixing Block, 502-Slide Table, 503-On / Off Step, 504-Limit Block, 505-Slide Rail, 51-Waterproof and Dustproof Cover, 52-Button, 53-Second Spring, 54-Positioning Post, 541-Concave Hole, 55-Sliding Contact Spring, 551-Fixing Hole, 552-Contact Point, 60-Fixing Bracket, 601-Spring Pin, 61-Modible Terminal, 611-Spring Post, 612-V-Block, 62-Fixing Terminal, 621-Connecting Plate, 63-Third Spring. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0017] like Figures 1 to 15As shown, a power tool signal switch includes an upper housing 10 and a lower housing 20. The top of the upper housing 10 has an internal reversing mechanism, the operating handle 31 of which protrudes from the top of the upper housing 10. The lower side of the reversing mechanism is connected to the upper side of a PCB board 40. The lower side of the PCB board 40 has a switch slide assembly and a switch on / off mechanism. The front end of the switch slide assembly extends beyond the right side of the upper housing 10 and the lower housing 20. A first waterproof and dustproof mechanism is provided between the reversing mechanism and the upper housing 10. A second waterproof and dustproof mechanism is provided on the switch slide assembly. A third waterproof and dustproof mechanism is provided between the upper housing 10 and the lower housing 20. The first, second, and third waterproof and dustproof mechanisms of this solution completely seal off the external gaps of the entire power tool signal switch, providing excellent waterproof and dustproof performance.

[0018] Specifically, the reversing mechanism includes a rotating cover 30 and a reversing core assembly located on the lower side of the rotating cover 30, and a reversing spring 32 located on the lower side of the reversing core assembly. The operating handle 31 is located on the upper surface of the rotating cover 30, and the operating handle 31 and the rotating cover 30 are an integral structure. This design has the advantages of being more reliable and easier to use.

[0019] Specifically, the reversing core assembly includes a reversing core 33, a first spring 34 laterally sleeved inside the reversing core 33, and two ball bearings 35 located at both ends of the first spring 34. The first spring 34 and the ball bearings 35 are designed to engage with the three reversing position slots 11 on the inner top of the upper housing 10, thereby enabling the power tool to operate in three positions: forward, suspended, and reverse. For easier and more flexible use, a suitable amount of lubricant can be applied to the surface of the ball bearings 35. When carrying the power tool outdoors, placing the operating handle 31 in the middle suspended position ensures that the power tool will not be accidentally triggered, improving product safety.

[0020] Specifically, the rotating cover 30 has a shaft hole 301 at its lower center, and a pin 302 on each side of the shaft hole 301. The reversing core 33 has a convex rotating shaft 331 on its upper side, with a pin hole 332 on each side. The rotating shaft 331 matches and is sleeved with the shaft hole 301, and the pins 302 match and are sleeved with the pin holes 332. To prevent loosening or detachment between the rotating cover 30 and the reversing core 33, this design includes two convex arc blocks 334 on the upper outer ring of the rotating shaft 331, corresponding to concave arc grooves 303 within the shaft hole 301. The convex arc blocks 334 and concave arc grooves 303 engage. The design of the two pins 302 and the two pin holes 332 improves the rotational force of the rotating cover 30 and the reversing core 33 and prevents slippage after prolonged use. In addition, to ensure smooth and precise rotation of the rotating cover 30 and the commutator core 33, multiple positioning blocks 335 are provided on the outer side of the commutator core 33, such as three positioning blocks 335 in this embodiment. To prevent the rotating cover 30 and the commutator core 33 from rotating 360 degrees, a rotation limiting groove 19 is provided on the top inner side of the upper shell 10. This rotation limiting groove 19 is used in conjunction with the middle positioning block 335.

[0021] Specifically, the commutator core 33 has two fixing posts 333 on its lower side. These fixing posts 333 fix the middle part of the commutator spring 32 (which has a post hole 320). The fixing can be done by heat fusion, which eliminates the trouble of screwing or gluing.

[0022] Specifically, the lower side of the commutation spring 32 is provided with multiple protruding contacts 321. By moving the operating handle 31, the protruding contacts 321 can be electrically connected to the commutation contact plate 41 on the upper side of the PCB board 40. In this design, each commutation contact plate 41 is designed with two protruding contacts 321 in contact at the same time. This has multiple advantages, such as ensuring more reliable contact, increasing the conductive current, and reducing the on-resistance.

[0023] Specifically, the switch slide assembly includes a switch slide 50, a button 52 fitted onto the front end of the switch slide 50, a second spring 53 fitted onto the rear end of the switch slide 50, and a positioning post 54 fitted onto the rear end of the second spring 53. The rear end of the positioning post 54 has a recess 541 that matches a protrusion 21 on the lower housing 20. The second waterproof and dustproof mechanism is a waterproof and dustproof sleeve 51 fitted between the front end of the switch slide 50 and the upper housing 10 and the lower housing 20. The positioning post 54 not only serves to position the rear end of the switch slide 50, but also has the advantages of fixing the rear end of the second spring 53 and making its extension and retraction more flexible.

[0024] Specifically, a spring plate fixing platform 501 is provided on the upper middle part of the switch slide rod 50. Multiple sets of sliding contact springs 55 are fixed on the spring plate fixing platform 501. The rear part of the switch slide rod 50 is a slide table 502. One side of the slide table 502 is provided with a switching step 503 that matches the switch switching mechanism. In this embodiment, the spring plate fixing platform 501 is provided with two fixing slots 5011 and fixing blocks 5012 for the lower side of the two sets of sliding contact springs 55 to be inserted. The fixing blocks 5012 fix the fixing holes 551 on the lower side of the sliding contact springs 55. Each set of sliding contact springs 55 is provided with two sets of contact pieces on the upper side. Each set of contact pieces is provided with two contact points 552, which increases the contact reliability. Each set of contact pieces is electrically connected to a sliding contact strip 42 on the lower side of the PCB board 40, realizing the dual function of power supply and speed regulation of the power tool. This solution sets two sets of sliding contact springs 55 and sliding contact strips 42, which significantly improves the application current of the switch and can be used in a wider range of application environments. In this design, a limiting block 504 is provided on each side of the slide table 502. The lower part of the limiting block 504 is connected to the slide rail 505, and the upper surface of the limiting block 504 is slidably connected to the limiting strip 25 on the wall of the lower shell 20.

[0025] Specifically, the switch-on / off mechanism includes a fixed bracket 60, a movable terminal 61 with one end fitted onto a hook on the fixed bracket 60, and the other end of the movable terminal 61 electrically connected to the contact piece 621 of the fixed terminal 62. A third spring 63 is provided between the upper side of the movable terminal 61 and the upper part of the fixed bracket 60. The upper ends of the fixed bracket 60 and the fixed terminal 62 are soldered to the PCB board 40, and the lower end of the fixed bracket 60 is inserted into the slot 22 of the lower shell 20. To ensure that both ends of the third spring 63 are well fixed, spring posts 611 are provided on the movable terminal 61, and spring pins 601 are provided on the fixed bracket 60. To ensure the stability of the PCB board 40, two fasteners 13 are provided on the inner wall of the upper shell 10 to fix the PCB board 40. To prevent the PCB board 40 from being installed incorrectly with the front and back sides facing each other, multiple positioning pouches 12 are provided on the inner wall of the upper shell 10. The working principle of the switch-on / off mechanism of this solution is shown in the appendix of the instruction manual. Figure 12 and 13When button 52 is pressed, the switch slide 50 pushes the second spring 53 inward, simultaneously causing the on / off step 503 to move inward. At this time, under the action of the third spring 63, the V-shaped block 612 in the middle of the movable terminal 61 falls into the lower step of the on / off step 503. The other end of the movable terminal 61 is electrically connected to the contact piece 621 to energize the switch. On the other hand, the spring plate fixing platform 501 causes the sliding contact spring 55 to contact the sliding contact strip 42 to achieve the speed adjustment function. When button 52 is released, the switch slide 50 returns to its original position under the action of the second spring 53. At this time, the inclined surface of the on / off step 503 lifts the V-shaped block 612 and presses the third spring 63 upward, finally causing the V-shaped block 612 to be at the upper step of the on / off step 503. The other end of the movable terminal 61 disconnects from the contact piece 621 to de-energize the switch. On the other hand, the spring plate fixing platform 501 causes the sliding contact spring 55 to slide to the minimum speed end (or the speed 0 end) of the sliding contact strip 42.

[0026] Specifically, the upper shell 10 is provided with a circular groove 14 that matches the contour of the rotating cover 30. A through hole 140 is provided in the center of the circular groove 14. The first waterproof and dustproof mechanism is a multi-level concave-convex structure 15 located between the lower side of the rotating cover 30 and the upper side of the circular groove 14. It includes at least two water-blocking rings 151 and 152 that rise from the outside to the inside. This structure effectively prevents water and dust from entering.

[0027] The third waterproof and dustproof mechanism consists of a groove 16 on the lower edge of the upper shell 10 and a protruding edge 23 on the upper edge of the lower shell 20. The protruding edge 23 matches the groove 16, ensuring that the upper shell 10 and the lower shell 20 do not misalign. The upper shell 10 and the lower shell 20 are joined together by multiple snap-fit ​​fasteners, with a snap-fit ​​opening 24 on the lower shell 20 and a snap-fit ​​block 17 on the upper shell. This assembly method has the advantages of saving screw costs and improving assembly efficiency. The PCB board 40 of this solution has a ribbon cable 43 leading out from the upper side of the upper shell 10. Waterproof glue is applied to the lead-in port 18 of the upper shell 10 for sealing. The ribbon cable 43 is electrically connected to a power tool (which is existing technology and is not shown in the figure).

[0028] In summary, the technical solution of this utility model has the following beneficial effects: This invention proposes a reversing mechanism that is completely integrated within the switch housing. The outer surface only has a raised operating handle for power tool reversing. This reversing mechanism is flat and has no exposed holes. This built-in design ensures a smooth reversing component, abandoning the existing through-type reversing mechanisms assembled using snap-fit ​​or riveting methods. In this solution, the reversing mechanism uses a pin on the lower side of a rotating cover integrated with the operating handle to drive the reversing core assembly. The first spring on the lower side of the reversing core assembly connects with the reversing contact plate on the upper side of the PCB board to achieve the reversing function. This solution features a multi-stage concave-convex mechanism between the adjustment cover and the upper shell as the first level of waterproofing and dustproofing. The switch slide has a second level of waterproofing and dustproofing, and a third level at the junction of the upper and lower shells, effectively improving waterproofing and dustproofing, and significantly enhancing the safety and stability of the power tool. This invention retains two existing sets of contact signals while adding another set of contact signals on the side of the switch (i.e., this solution designs two sets of sliding contact springs and sliding contact strips), which significantly increases the application current of the switch. This solution can be used in a wider range of application environments. In summary, this solution has a simple, compact structure, multiple waterproof and dustproof mechanisms, and is safe and reliable.

[0029] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A power tool signal switch, comprising an upper housing and a lower housing, characterized in that: The top of the upper shell is provided with an internal reversing mechanism. The operating handle of the reversing mechanism protrudes from the top of the upper shell. The lower side of the reversing mechanism is connected to the upper side of the PCB board. The lower side of the PCB board is provided with a switch slide assembly and a switch on / off mechanism. The front end of the switch slide assembly extends out to the right side of the upper and lower shells. A first waterproof and dustproof mechanism is provided between the reversing mechanism and the upper shell. A second waterproof and dustproof mechanism is provided on the switch slide assembly. A third waterproof and dustproof mechanism is provided between the upper and lower shells.

2. The power tool signal switch according to claim 1, characterized in that: The reversing mechanism includes a rotating cover and a reversing core assembly disposed on the lower side of the rotating cover, and a reversing spring disposed on the lower side of the reversing core assembly. The operating handle is disposed on the upper surface of the rotating cover.

3. The power tool signal switch according to claim 2, characterized in that: The commutator assembly includes a commutator, a first spring laterally fitted inside the commutator, and two ball bearings located at both ends of the first spring.

4. The power tool signal switch according to claim 3, characterized in that: The rotating cover has a shaft hole in the center of its lower side, and a pin on each side of the shaft hole. The reversing core has a convex rotating shaft on its upper side, and a pin hole on each side of the rotating shaft. The rotating shaft matches and is sleeved with the shaft hole, and the pin matches and is sleeved with the pin hole.

5. A power tool signal switch according to claim 4, characterized in that: Two fixing posts are provided on the lower side of the commutation core, which fix the commutation spring piece.

6. A power tool signal switch according to claim 2, characterized in that: The lower side of the reversing spring is provided with multiple protruding contacts. Moving the operating handle can make the protruding contacts electrically connected to the reversing contact plate on the upper side of the PCB board.

7. The power tool signal switch according to claim 1, characterized in that: The switch slide assembly includes a switch slide, a button fitted at the front end of the switch slide, a second spring fitted at the rear end of the switch slide, and a positioning post fitted at the rear end of the second spring. The rear end of the positioning post has a concave hole that matches a protruding post on the lower shell.

8. A power tool signal switch according to claim 7, characterized in that: The upper middle part of the switch slide rod is provided with a spring plate fixing platform, on which multiple sets of sliding contact spring plates are fixed. The rear part of the switch slide rod is a slide table, and one side of the slide table is provided with an on / off step that matches the switch on / off mechanism.

9. A power tool signal switch according to claim 8, characterized in that: The switch mechanism includes a fixed bracket, a movable terminal with one end fitted onto the hook of the fixed bracket, the other end of the movable terminal being electrically connected to the contact of the fixed terminal, a third spring being provided between the upper side of the movable terminal and the upper part of the fixed bracket, the upper ends of the fixed bracket and the fixed terminal being soldered to the PCB board, and the lower end of the fixed bracket being inserted into the slot of the lower shell.

10. A power tool signal switch according to claim 2, characterized in that: The upper shell is provided with a circular groove that matches the contour of the rotating cover. A through hole is provided in the center of the circular groove. The first waterproof and dustproof mechanism is a multi-level concave-convex structure between the lower side of the rotating cover and the upper side of the circular groove, including at least two water-retaining rings that rise progressively from the outside to the inside. The third waterproof and dustproof mechanism is a groove on the lower edge of the upper shell and a convex edge on the upper edge of the lower shell. The convex edge matches the groove. The upper shell and the lower shell are closed by multiple snaps.

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