A trigger switch

Abstract

The present invention discloses a trigger switch, which relates to a switch device for turning on or off an electric tool such as an electric wrench. The structure of the trigger switch includes a bottom shell, a bracket, a conductive bridge and a conductive terminal. The bracket mainly has a conductive shaft, the conductive bridge is supported on the conductive shaft, and forms a seesaw-like rotation with the conductive shaft as a rotating axis, so as to achieve contact and conduction or separation and power-off between the conductive bridge and the conductive terminal. Since the driving contact movement mechanism of the trigger switch is in surface contact, it can obviously withstand the load current generated by the electric tool more stably than traditional line contact, and can reduce the friction resistance between the conductors. In this way, the resistance will not increase and the temperature will not rise too high during long-term use, thereby solving the disadvantages of line contact in the current field. Therefore, it can withstand the application of high-power electric tools and has a longer service life.

Description

Technical Field

[0001] The invention relates to a switch device for turning on or off an electric tool such as an electric wrench, in particular to a trigger switch. Background Art

[0002] Trigger switches are primarily used in relatively high-power power tools, such as electric wrenches. These tools are subject to harsh operating environments, heavy loads, extended use, and significant vibration. Consequently, these tools place stringent requirements on the trigger switch. They must be able to withstand the high instantaneous current generated during tool activation, prevent the conductive mechanism from momentarily disconnecting due to tool vibration, and provide a stable current output during operation. Furthermore, the trigger switch must be able to withstand the high interruption current generated by the power tool during disconnection. Therefore, the core structural requirements for the trigger switch are to stably withstand the high load current generated by the power tool while maintaining a low temperature rise. However, most similar trigger switches currently on the market suffer from short service life or are unable to withstand high-power power tool applications. Their high temperature rise requires the use of expensive, high-temperature-resistant plastic materials to compensate for these drawbacks. This is due to the fact that the driving contacts of trigger switches are in line contact, which results in high frictional resistance within the conductive mechanism and a small current-carrying area. Consequently, after repeated use, the silver coating of the conductive mechanism can be easily damaged, resulting in increasing resistance and a high temperature rise during actual use. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a trigger switch that can stably withstand the load current generated by the power tool, will not increase resistance and excessive temperature rise during long-term use, and has a long service life.

[0004] The technical problem of the present invention is achieved through the following technical solutions:

[0005] A trigger switch includes a base shell, a conductive terminal mounted on the base shell, and a bracket. The bracket is provided with a conductive bridge mounted in a seesaw-like manner, and the conductive bridge is able to contact the conductive terminal to conduct electricity or disengage to cut off power through seesaw-like rotation. The bracket is provided with a conductive shaft, and the conductive bridge is supported on the conductive shaft and rotates with the conductive shaft as the rotating axis to form a seesaw-like surface contact.

[0006] The conductive bridge is rotatably buckled on the conductive shaft through buckle grooves arranged on the bottom surface, or is directly rotatably supported on the conductive shaft through a flat bottom surface.

[0007] The conductive shaft is horizontally installed in the horizontal shaft hole on the top of the bracket.

[0008] The horizontal axis hole is a horizontal circular hole, which is formed by interlocking semicircular grooves respectively arranged on the opposite surfaces of the bracket and the cover plate, and the cover plate is fixed to the bracket.

[0009] The top of the bracket is provided with several bracket forks extending upward, and the top surface of the cover plate is also provided with several cover plate forks extending upward and equal in number to the bracket forks. A horizontal axis hole is provided between each pair of bracket forks and cover plate forks, and the multiple horizontal axis holes are all on the same horizontal axis line.

[0010] The conductive shaft between each two adjacent horizontal shaft holes is exposed and allows the conductive bridge to rotate in a seesaw-type surface contact manner.

[0011] The bracket and the cover plate are fixed by spot welding, laser welding or riveting.

[0012] The conductive shaft is a horizontally installed cylindrical conductive copper rod.

[0013] The front end of the conductive bridge is provided with a conductive contact that forms contact with the conductive terminal to conduct electricity or disconnect from the conductive terminal to cut off power.

[0014] A tension spring connected to each other is provided between the front end of the conductive bridge and the bottom shell.

[0015] Compared with the prior art, the present invention mainly provides a conductive shaft on the bracket of the trigger switch, and the conductive bridge is supported on the conductive shaft, and forms a seesaw-like rotation with the conductive shaft as the rotating axis, so as to achieve contact and conduction or disconnection between the conductive bridge and the conductive terminal. Since the driving contact movement mechanism of this trigger switch is in surface contact, it can obviously withstand the load current generated by the power tool more stably than the traditional line contact, and can reduce the friction resistance between the conductors. In this way, the resistance will not increase and the temperature will not rise too high after long-term use, which solves the disadvantages of line contact in the current field. Therefore, it can withstand the application of high-power power tools and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 Schematic diagram of the matching structure of the bracket and the conductive bridge.

[0018] Figure 3 for Figure 2 Stereoscopic image.

[0019] Figure 4 for Figure 2 3D exploded view of . DETAILED DESCRIPTION

[0020] The embodiments of the present invention will be described in detail below with reference to the above-mentioned drawings.

[0021] like Figures 1 to 4 As shown, 1. bottom shell, 2. bracket, 21. bracket fork, 3. conductive bridge, 31. buckle groove, 32. conductive contact, 4. conductive shaft, 5. conductive terminal, 6. cover plate, 61. cover plate fork, 7. tension spring, 8. horizontal axis hole.

[0022] A trigger switch, such as Figure 1 As shown, it mainly relates to a switch device for turning on or off an electric tool such as an electric wrench, and its structure includes a bottom shell 1, a bracket 2, a conductive bridge 3 and a conductive terminal 5.

[0023] The bottom shell 1 is a non-conductive basic component of the trigger switch, the bracket 2 is vertically fixedly mounted on the bottom shell 1 , and the conductive terminal 5 is also fixedly mounted on the bottom shell 1 and located on the left side of the bracket 2 .

[0024] The bracket 2 is provided with a conductive bridge 3 installed in a seesaw style. The specific structure is: a conductive shaft 4 is provided on the top of the bracket 2, and the conductive shaft is a horizontally installed cylindrical conductive copper rod. That is, when the bottom shell 1 is placed on a plane, the conductive shaft 4 is in a horizontally installed state, and the conductive bridge 3 is supported on the conductive shaft 4, and forms a seesaw-style surface contact rotation with the conductive shaft as the rotating axis.

[0025] There are two types of supporting structures for the conductive bridge 3 and the conductive shaft 4. Figure 3 、 Figure 4 As shown, the conductive bridge 3 is rotatably mounted on the conductive shaft 4 by means of the buckle groove 31 provided on the bottom surface, thereby forming a seesaw-type surface contact rotation. Alternatively, the conductive bridge 3 can be directly rotatably supported on the conductive shaft 4 by means of a flat bottom surface, thereby also forming a seesaw-type surface contact rotation.

[0026] Of course, the supporting structures are obviously not limited to the above two types, because as long as the purpose of seesaw-type surface contact rotation between the conductive bridge 3 and the conductive shaft 4 can be achieved, any structure can be adopted.

[0027] The conductive shaft 4 is actually installed horizontally in the horizontal shaft hole 8 at the top of the bracket 2. In this embodiment, the conductive shaft 4 is fixed in the horizontal shaft hole 8. However, in some cases, if the conductive shaft 4 is movably inserted in the horizontal shaft hole 8, that is, the conductive shaft 4 rotates in the horizontal shaft hole 8, it will not affect the seesaw-type surface contact rotation of the conductive bridge 3.

[0028] The horizontal axis hole 8 is a horizontal circular hole, which is formed by interlocking semicircular grooves respectively provided on the opposite surfaces of the bracket 2 and the cover plate 6. The so-called cover plate 6 is as shown in FIG. Figure 3As shown, it is fixed on the left side of the bracket 2, and the two can be fixed by spot welding, laser welding or riveting. When the cover plate 6 and the bracket 2 are fixed, the horizontal axis hole 8 is also formed and the conductive shaft 4 is fixed therein.

[0029] At the same time, a plurality of bracket forks 21 extending upward are provided on the top of the bracket 2, and a plurality of cover plate forks 61 extending upward and equal in number to the bracket forks 21 are also provided on the top surface of the cover plate 6. Figure 4 As shown, three pairs of bracket forks 21 and cover plate forks 61 are designed, and a horizontal axis hole 8 is provided between each pair of bracket forks 21 and cover plate forks 61. Therefore, this embodiment has three horizontal axis holes, and the three horizontal axis holes 8 are all on the same horizontal axis line and are for the conductive shaft 4 to pass through together; in this way, the conductive shaft 4 between two adjacent horizontal axis holes 8 will be exposed, and at this time, the conductive bridge 3 can also form a seesaw-type surface contact rotation with the conductive shaft 4, that is, a circular arc surface contact rotation.

[0030] The front end, that is, the left end, of the conductive bridge 3 is provided with a conductive contact 32 . The conductive bridge 3 rotates in a seesaw-like manner to drive the conductive contact 32 to contact the conductive terminal 5 to conduct electricity or to disconnect the conductive contact 32 to cut off electricity.

[0031] Furthermore, a tension spring 7 is provided between the front end (i.e., the left end) of the conductive bridge 3 and the bottom case 1. The lower end of the tension spring is hooked to a fixing block, which is secured via a square hole in the bracket 2. Thus, under normal conditions, the tension of the tension spring 7 ensures that the conductive contact 32 at the front end of the conductive bridge 3 is in constant contact with the conductive terminal 5, effectively maintaining the circuit in a normally closed state.

[0032] The driving contact movement mechanism of the present invention is in surface contact, which can obviously withstand the load current generated by the power tool more stably than the traditional line contact, and can reduce the friction resistance between the conductors. The friction coefficient is close to zero. In this way, there will be no increase in resistance and excessive temperature rise during long-term use, which solves the disadvantages of line contact in the current field. Therefore, it can withstand the application of high-power power tools and ensures its service life.

[0033] The above description is only a specific embodiment of the present invention. Those skilled in the art should understand that any structural design similar to this embodiment should be included in the protection scope of the present invention.

Claims

1. A trigger switch, comprising a bottom shell (1), a conductive terminal (5) and a bracket (2) mounted on the bottom shell, wherein a conductive bridge (3) is provided on the bracket in a seesaw-type installation, and the conductive bridge is in contact with the conductive terminal (5) through seesaw-type rotation to conduct electricity or to disconnect from the conductive terminal (5), characterized in that The bracket (2) is provided with a conductive shaft (4), the conductive bridge (3) is supported on the conductive shaft (4), and forms a seesaw-type surface contact rotation with the conductive shaft as a rotating axis; the conductive shaft (4) is horizontally installed in a horizontal shaft hole (8) at the top of the bracket (2); the horizontal shaft hole (8) is a horizontal circular hole, which is formed by interlocking semicircular grooves respectively provided on the opposite surfaces of the bracket (2) and the cover plate (6), and the cover plate (6) is fixed to the bracket (2).

2. A trigger switch according to claim 1, characterized in that The conductive bridge (3) is rotatably fastened to the conductive shaft (4) by means of a fastening groove (31) provided on the bottom surface, or is directly rotatably supported on the conductive shaft (4) by means of a flat bottom surface.

3. A trigger switch according to claim 1, characterized in that The top of the bracket (2) is provided with a plurality of bracket forks (21) extending upward, and the top surface of the cover plate (6) is also provided with a plurality of cover plate forks (61) extending upward, the number of which is equal to the number of the bracket forks (21), and a horizontal axis hole (8) is provided between each pair of bracket forks (21) and cover plate forks (61), and the plurality of horizontal axis holes are all located on the same horizontal axis line.

4. A trigger switch according to claim 3, characterized in that The conductive shaft (4) between each two adjacent horizontal shaft holes (8) is exposed and allows the conductive bridge (3) to rotate in a seesaw-type surface contact manner.

5. A trigger switch according to claim 1, characterized in that The bracket (2) and the cover plate (6) are fixed by spot welding, laser welding or riveting.

6. A trigger switch according to claim 1, characterized in that The conductive shaft (4) is a horizontally installed cylindrical conductive copper rod.

7. A trigger switch according to claim 1, characterized in that The front end of the conductive bridge (3) is provided with a conductive contact (32) that forms contact with the conductive terminal (5) to conduct electricity or disconnect from the conductive terminal (5) to cut off electricity.

8. A trigger switch according to claim 1, characterized in that A tension spring (7) connected to each other is provided between the front end of the conductive bridge (3) and the bottom shell (1).

Images