A self-locking and self-unlocking switch structure

Abstract

In view of the drawbacks that in the prior art, the trigger, self-locking switch, and safety switch on the power tool are all operated independently, and the operation is very cumbersome, the present invention provides a self-locking and self-unlocking switch structure, belonging to the technical field of power tools, including a housing, a lining bracket, a switch, a trigger, and a limit block. A dial is also rotatably connected to the trigger, and a first convex block is fixedly provided on the dial. A torsion spring is also provided on the trigger; a first spring is provided on the housing or the lining bracket; a guide hole is further provided on the housing or the lining bracket, and a locking button is provided in the guide hole. A card slot is provided on the side of the locking button facing away from the dial, and a card block capable of being embedded in the card slot is provided on the trigger. When the card block is embedded in the card slot, the trigger touches the switch; a second spring capable of driving the locking button to move away from the trigger is further provided on the housing or the lining bracket. The present invention not only has a self-locking function but also has a self-unlocking function, and the operation is very simple.

Description

Technical Field

[0001] The present invention belongs to the technical field of power tools, and particularly relates to a self-locking and self-unlocking switch structure. Background Art

[0002] Electric drills, electric cutters, electric saws, etc. are common power tools. These power tools are generally driven by a set trigger, and it is necessary to keep pressing the trigger during use, which is very cumbersome. To facilitate use, some power tools are provided with a self-locking switch. After pressing the trigger, the self-locking switch can lock the trigger, so that it is not necessary to keep pressing the trigger when using the power tool. At the same time, in order to prevent the trigger from being accidentally touched and causing the power tool to work, some power tools are also provided with a safety switch to prevent accidental touch. Moreover, the safety switch, self-locking switch, and trigger are all independently operated. When in use, it is necessary to first turn on the safety switch, press the trigger, and then press the self-locking switch. After use, it is necessary to unlock the self-locking switch, release the trigger, and finally press the safety switch again, which is very cumbersome to operate. Summary of the Invention

[0003] Aiming at the drawbacks that the trigger, self-locking switch, and safety switch on the power tool in the prior art are all independently operated and very cumbersome to operate, the present invention provides a self-locking and self-unlocking switch structure. This switch structure not only has a self-locking function but also has a self-unlocking function, and is very simple to operate.

[0004] The invention object of the present invention is realized by the following technical solutions: A self-locking and self-unlocking switch structure, including a housing, a lining bracket and a switch fixedly arranged in the housing, a trigger that can only slide linearly in the housing and drive the switch, a limiting block fixedly arranged on the trigger, a dial button rotatably connected to the trigger, a first convex block fixedly arranged on the dial button, and a torsion spring arranged on the trigger that can drive the dial button to rotate and make the first convex block closely adhere to the limiting block. When the first convex block fits with the limiting block, the first convex block and the lining bracket cooperate to prevent the trigger from touching the switch; a first spring for driving the trigger to move away from the switch is arranged on the housing or the lining bracket; a guiding hole perpendicular to the trigger is also arranged on the housing or the lining bracket, a locking button that can only slide along the guiding hole is arranged in the guiding hole, a clamping groove is arranged on the side of the locking button facing away from the dial button, and a clamping block that can be embedded in the clamping groove is arranged on the trigger. When the clamping block is embedded in the clamping groove, the trigger touches the switch; a second spring for driving the locking button to move away from the trigger is also arranged on the housing or the lining bracket.

[0005] In the above solution, when the knob is not toggled, under the action of the torsion spring, the first convex block closely adheres to the limiting block. At this time, the first convex block on the knob and the inner lining bracket cooperate to prevent the trigger from touching the switch. At this time, the trigger has a self-locking function, and the trigger cannot touch the switch and cannot drive the power tool to operate, which can achieve the effect of preventing accidental touch. When the power tool needs to be used, the knob needs to be toggled first to separate the first convex block from the limiting block. At this time, the trigger can be pressed to drive the power tool to work. For ease of use, after pressing the trigger, the locking button can be pressed so that the card slot on the locking button and the clamping block on the trigger are in the same plane. At this time, when the trigger is released, under the action of the first spring, the trigger will move towards the side away from the switch until the clamping block on the trigger is inserted into the card slot. At this time, the trigger still keeps touching the switch, and the locking button plays a self-locking role for the trigger. At this time, there is no need to keep pressing the trigger when using the power tool. After use, just press the trigger to separate the clamping block from the card slot. Under the action of the second spring, the locking button will move towards the side away from the trigger so that the clamping block and the card slot are not in the same plane. At this time, under the action of the first spring, the trigger will return to the initial position, that is, the state of not driving the switch. At this time, the self-unlocking function of the locking button is realized. At the same time, under the elastic action of the torsion spring, the knob rotates so that the first convex block closely adheres to the limiting block. At this time, the trigger has a self-locking function, achieving the effect of preventing accidental touch, and the operation is very simple.

[0006] Preferably, a locking hole penetrating the trigger is provided on the trigger, the clamping block is fixed on the inner wall of the locking hole, the locking hole can be aligned with the guiding hole by sliding the trigger, and one end of the locking button provided with the card slot can be inserted into the locking hole. After the locking button is inserted into the locking hole, the clamping block is then inserted into the card slot. Such a setting enables the locking button to have a better locking effect on the trigger.

[0007] Preferably, the trigger includes a plate body. On the side of the plate body facing the switch, there is a mounting hole. At the outer end of the mounting hole, there is a driving block for touching the switch. The driving block is partially embedded in the mounting hole and can only slide along the length direction of the mounting hole. A buffer spring is provided between the inner end of the mounting hole and the driving block. When driving the trigger to realize the self-unlocking function of the locking button, the trigger needs to move towards the switch first. In this process, in order to prevent the trigger from damaging the switch, through the arranged driving block and buffer spring, the trigger and the switch can be in elastic contact, which can play a protective role for the switch and enable the trigger to always touch the switch in this process.

[0008] Preferably, a second convex block for cooperating with the limiting block is also fixed on the knob. The limiting block is located between the first convex block and the second convex block. When the first convex block fits with the limiting block, there is a gap between the second convex block and the limiting block. When the second convex block fits with the limiting block, there is a gap between the first convex block and the limiting block and the torsion spring deforms.

[0009] Preferably, a force-receiving part is fixedly arranged on the knob. The side surface of the force-receiving part is of an arc-shaped structure. When the second convex block is in contact with the limiting block, the side surface of the force-receiving part faces the front side of the trigger. At this time, the user's index finger can press on the side surface of the force-receiving part. With the cooperation of the second convex block and the limiting block, the knob and the trigger will not rotate relative to each other any further. At this time, the force-receiving part pressed on the knob can not only prevent the knob from further rotating but also drive the trigger to slide towards the switch side, making the operation more convenient.

[0010] Preferably, the lower end of the force-receiving part is the force-receiving point. When the first convex block is in contact with the limiting block, the force-receiving point is located outside the trigger and above the straight line where the first convex block is located.

[0011] Preferably, the knob and the trigger are rotationally connected by arranging a rotating shaft. The angle between the connection line between the rotating shaft and the force-receiving point and the straight line where the first convex block is located is >5°.

[0012] Preferably, the switch is a micro switch.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention not only has a self-locking function but also has a self-unlocking function, and the operation is very simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is of the present invention at Figure 1 a cross-sectional view taken along line A-A;

[0016] Figure 3 is a three-dimensional view of the locking button;

[0017] Figure 4 is a three-dimensional view of the trigger;

[0018] Figure 5 is a schematic diagram of the state of the present invention when the knob is toggled;

[0019] Figure 6 is a schematic diagram of the state of the present invention when the knob is toggled and the trigger is driven to touch the switch;

[0020] Figure 7 is of the present invention at Figure 6 a cross-sectional view taken along line B-B;

[0021] Markings in the figure: 1. Housing, 2. Inner lining support, 3. Switch, 4. Trigger, 5. Limit block, 6. Plate body, 7. Mounting hole, 8. Driving block, 9. Buffer spring, 10. Knob, 11. First convex block, 12. Torsion spring, 13. Second convex block, 14. Force-bearing part, 15. First spring, 16. Guide hole, 17. Locking button, 18. Card slot, 19. Locking hole, 20. Block, 21. Second spring, 22. Force point, 23. Rotating shaft. Detailed implementation mode

[0022] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings:

[0023] Embodiment 1

[0024] As Figures 1-7 shown, a self-locking and self-unlocking switch structure includes a housing 1, an inner lining support 2 fixedly arranged in the housing 1, a switch 3, a trigger 4 that can only slide linearly in the housing 1 and drive the switch 3, and a limit block 5 fixedly arranged on the trigger 4. The switch 3 is a micro switch. The trigger 4 includes a plate body 6. On the side of the plate body 6 facing the switch 3, there is a mounting hole 7. At the outer end of the mounting hole 7, there is a driving block 8 for touching the switch 3. Part of the driving block 8 is embedded in the mounting hole 7 and can only slide along the length direction of the mounting hole 7. A buffer spring 9 is arranged between the inner end of the mounting hole 7 and the driving block 8. A knob 10 is also rotatably connected to the plate body 6 of the trigger 4. A first convex block 11 is fixedly arranged on the knob 10. A torsion spring 12 that can drive the knob 10 to rotate and make the first convex block 11 closely adhere to the limit block 5 is also arranged on the trigger 4. When the first convex block 11 is in contact with the limit block 5, the cooperation between the first convex block 11 and the inner lining support 2 can prevent the trigger 4 from touching the switch 3. A second convex block 13 that cooperates with the limit block 5 is also fixedly arranged on the knob 10. The limit block 5 is located between the first convex block 11 and the second convex block 13. When the first convex block 11 is in contact with the limit block 5, there is a gap between the second convex block 13 and the limit block 5. When the second convex block 13 is in contact with the limit block 5, there is a gap between the first convex block 11 and the limit block 5 and the torsion spring 12 is deformed. A force-bearing part 14 is fixedly arranged on the knob 10, and the side surface of the force-bearing part 14 is of an arc-shaped structure. When the second convex block 13 is in contact with the limit block 5, the side surface of the force-bearing part 14 faces the front side of the trigger 4. The lower end of the force-bearing part 14 is a force point 22. When the first convex block 11 is in contact with the limit block 5, the force point 22 is located outside the trigger 4 and above the straight line where the first convex block 11 is located. The knob 10 and the trigger 4 are rotatably connected by arranging a rotating shaft 23. The angle between the connection line between the rotating shaft 23 and the force point 22 and the straight line where the first convex block 11 is located is 21.66°.

[0025] A first spring 15 for driving the trigger 4 to move away from the switch 3 is provided on the inner lining bracket 2; a guiding hole 16 perpendicular to the trigger 4 is further provided on the housing 1, and a locking button 17 that can only slide along the guiding hole 16 is provided in the guiding hole 16. A clamping groove 18 is provided on the side of the locking button 17 facing away from the dial 10. A locking hole 19 penetrating through the trigger 4 is provided on the trigger 4, and a clamping block 20 that can be embedded in the clamping groove 18 is fixedly provided on the inner wall of the locking hole 19. Sliding the trigger 4 can align the locking hole 19 with the guiding hole 16 and one end of the locking button 17 provided with the clamping groove 18 can be inserted into the locking hole 19. When the clamping block 20 is embedded in the clamping groove 18, the trigger 4 touches the switch 3; a second spring 21 for driving the locking button 17 to move away from the trigger 4 is further provided on the housing 1 or the inner lining bracket 2.

[0026] As Figure 1 shown, in the initial state of the self-locking and self-unlocking switch 3 structure of the present application, under the action of the torsion spring 12, the first convex block 11 closely abuts against the limiting block 5. The inner lining bracket 2 can hold against the first convex block 11 on the dial 10, and the trigger 4 cannot slide towards the switch 3 side, so the trigger 4 cannot touch the switch 3. At this time, the self-locking function of the trigger 4 is achieved, and the effect of preventing accidental touch is achieved. When the power tool needs to be used, the dial 10 needs to be toggled first. As Figure 5 shown, the first convex block 11 is separated from the limiting block 5, and the second convex block 13 closely abuts against the limiting block 5. The user's index finger can press along the side of the force-receiving part 14 of the dial 10. Under the cooperation of the second convex block 13 and the limiting block 5, at this time, no relative rotation will occur between the dial 10 and the trigger 4. As Figure 6 shown, pressing on the force-receiving part 14 of the dial 10 can not only prevent the dial 10 from further rotating but also drive the trigger 4 to slide towards the switch 3 side. After the trigger 4 touches the switch 3, the power tool runs. For ease of use, after pressing the trigger 4, the locking button 17 can be pressed to make the locking button 17 slide along the guiding hole 16 until one end of the locking button 17 provided with the clamping groove 18 is inserted into the locking hole 19 on the trigger 4, so that the clamping groove 18 and the clamping block 20 on the trigger 4 are in the same plane. At this time, when the trigger 4 is released, under the action of the first spring 15, the trigger 4 will move towards the side facing away from the switch 3 until the clamping block 20 on the trigger 4 is embedded in the clamping groove 18. As Figure 7As shown, at this time, the trigger 4 still keeps pressing the switch 3, and the locking button 17 plays a self-locking role on the trigger 4. At this time, it is not necessary to keep pressing the trigger 4 when using the power tool. After use, just press the trigger 4 to separate the latch 20 from the slot 18. Under the action of the second spring 21, the locking button 17 will move towards the side opposite to the trigger 4, so that the latch 20 and the slot 18 are not in the same plane. At this time, under the action of the first spring 15, the trigger 4 will return to the initial position, that is, the state of not driving the switch 3. At this time, the self-unlocking function of the locking button 17 is realized. At the same time, under the elastic action of the torsion spring 12, the dial 10 rotates so that the first protrusion 11 abuts against the limiting block 5. At this time, it plays a self-locking function on the trigger 4, achieving the effect of preventing accidental touch, and the operation is very simple.

[0027] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A self-locking and self-unlocking switch structure, characterized in that, It includes a housing (1), a lining bracket (2) fixedly arranged inside the housing (1), a switch (3), a trigger (4) that can only slide linearly inside the housing (1) and drive the switch (3), a limit block (5) fixedly arranged on the trigger (4), a knob (10) rotatably connected to the trigger (4), a first convex block (11) fixedly arranged on the knob (10), a torsion spring (12) arranged on the trigger (4) that can drive the knob (10) to rotate and make the first convex block (11) closely adhere to the limit block (5). When the first convex block (11) is in contact with the limit block (5), the cooperation between the first convex block (11) and the lining bracket (2) can prevent the trigger (4) from touching the switch (3); a first spring (15) for driving the trigger (4) to move away from the switch (3) is arranged on the housing (1) or the lining bracket (2); a guide hole (16) perpendicular to the trigger (4) is further arranged on the housing (1) or the lining bracket (2), a locking button (17) that can only slide along the guide hole (16) is arranged in the guide hole (16), a card slot (18) is arranged on the side of the locking button (17) facing away from the knob (10), a clamping block (20) that can be inserted into the card slot (18) is arranged on the trigger (4). When the clamping block (20) is inserted into the card slot (18), the trigger (4) touches the switch (3); a second spring (21) for driving the locking button (17) to move away from the trigger (4) is further arranged on the housing (1) or the lining bracket (2); a locking hole (19) penetrating the trigger (4) is arranged on the trigger (4), the clamping block (20) is fixed on the inner wall of the locking hole (19), sliding the trigger (4) can align the locking hole (19) with the guide hole (16) and one end of the locking button (17) provided with the card slot (18) can be inserted into the locking hole (19); the trigger (4) includes a plate body (6), a mounting hole (7) is arranged on the side of the plate body (6) facing the switch (3), a driving block (8) for touching the switch (3) is arranged at the outer end of the mounting hole (7), the driving block (8) is partially embedded in the mounting hole (7) and can only slide along the length direction of the mounting hole (7), a buffer spring (9) is arranged between the inner end of the mounting hole (7) and the driving block (8); a second convex block (13) for cooperating with the limit block (5) is further fixedly arranged on the knob (10), the limit block (5) is located between the first convex block (11) and the second convex block (13). When the first convex block (11) is in contact with the limit block (5), there is a gap between the second convex block (13) and the limit block (5). When the second convex block (13) is in contact with the limit block (5), there is a gap between the first convex block (11) and the limit block (5) and the torsion spring (12) is deformed.

2. The self-locking and self-unlocking switch structure according to claim 1, characterized in that, A force-receiving part (14) is fixedly arranged on the knob (10), the side surface of the force-receiving part (14) is of an arc-shaped structure, and when the second convex block (13) is in contact with the limit block (5), the side surface of the force-receiving part (14) faces the front side of the trigger (4).

3. The self-locking and self-unlocking switch structure according to claim 2, characterized in that, The lower end of the force-bearing part (14) is a force-bearing point (22). When the first convex block (11) is in contact with the limit block (5), the force-bearing point (22) is located outside the trigger (4) and above the straight line where the first convex block (11) is located.

4. The self-locking and self-unlocking switch structure according to claim 3, characterized in that, The dial (10) and the trigger (4) are rotationally connected by arranging a rotating shaft. The angle between the connecting line between the rotating shaft (23) and the force-bearing point (22) and the straight line where the first convex block (11) is located is > 5°.

5. The self-locking and self-unlocking switch structure according to claim 1, characterized in that, The switch (3) is a microswitch.

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