Speed regulation switch of electric tool
By introducing a combination of shock-absorbing and return coil springs into the speed control switch of power tools, and utilizing guide holes and limiting structures, the problem of slippage wear was solved, thereby achieving stable signal output and extended switch life.
Patent Information
- Application Number
- CN202423271096.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-30
AI Technical Summary
During vibration, the slipper of the speed control switch in existing power tools suffers severe wear relative to the printed circuit board, resulting in unstable signal output and reduced switch life.
The design employs a combination of shock-absorbing and reset helical springs, and uses guide holes and limiting structures to restrict the movement of the push rod, reducing the sliding of the pawl relative to the printed circuit board, thereby achieving stable signal output and extending the switch life.
This effectively reduces wear between the slipper and the printed circuit board, improving the stability and lifespan of the speed control switch signal output.
Smart Images
Figure CN223743514U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to electric tool switch technology, especially a kind of electric tool speed regulation switch. BACKGROUND
[0002] Existing electric tools, such as Figure 1 As shown in the figure, its speed regulation switch inside usually has a contact type sliding claw 7 on the contact pad of printed circuit board 6 sliding, sliding claw 7 is usually fixed on push rod 3, push rod 3 one end is equipped with plate machine 1, push rod 3 other end is installed with reset coil spring 4.Pressing or releasing trigger 1 can make push rod drive sliding claw 7 reciprocating sliding on printed circuit board 6, realizes the on-off and speed regulation function of electric tool switch.
[0003] Adopt Figure 1 Electric tool of the speed regulation switch shown in the figure, due to electric tool work has vibration, especially in the impact class electric tool vibration is greater, finger presses trigger 1, will lead to operator in the maximum stroke position finger press not to hold, non-autonomous drive trigger 1 in maximum stroke area (usually in maximum stroke to release position certain distance) repeatedly moves, to make sliding claw 7 on printed circuit board 6 fast repeatedly slide, cause sliding claw 7 abrasion, lead to the reliability of contact to reduce, cause switch signal output to be unstable and switch life to reduce. UTILITY MODEL CONTENTS
[0004] The utility model solves the technical problem to provide a kind of electric tool speed regulation switch, can effectively reduce the abrasion of sliding claw relative to printed circuit board, effectively improve speed regulation switch signal output stability and speed regulation switch life.
[0005] To solve the above technical problem, the electric tool speed regulation switch provided by the utility model includes trigger 1, damping coil spring 2, push rod 3, reset coil spring 4, base 5, printed circuit board 6 and sliding claw 7;
[0006] The lower side of the printed circuit board 6 is formed with a contact pad;
[0007] The base 5 is fixedly arranged below the printed circuit board 6;
[0008] The trigger 1 is formed with a front-to-back guide hole 11;The front end of the guide hole 11 is open, and the rear end is closed;
[0009] The rear outer diameter of the push rod 3 is smaller than the inner diameter of the guide hole 11;
[0010] The rear part of the push rod 3 is clamped in the guide hole 11, and the clamped push rod 3 can slide forward and backward within a set distance along the guide hole 11;
[0011] The rear of the damping coil spring 2 is assembled in the guide hole 11 of the trigger 1, the front end abuts against the push rod 3, and the rear end abuts against the rear wall of the hole trigger 1;
[0012] The front end of the reset coil spring 4 abuts against the base 5, and the rear end abuts against the rear wall of the push rod 3 or the trigger 1;
[0013] The head end of the sliding claw 7 is installed on the upper side of the front part of the push rod 3, and the tail end is pressed into the lower side of the printed circuit board 6;
[0014] Pressing or releasing the trigger 1 in the front-rear direction can make the push rod 3 move forward or backward, and can make the push rod 3 move forward and backward relative to the trigger 1 within the set distance, and the sliding claw 7 installed on the push rod 3 moves linearly forward and backward with the push rod 3, and the sliding claw 7 moves forward and backward through the contact pad to make the contact pad change the on position or off.
[0015] Preferably, the electric tool is a handheld electric tool.
[0016] Preferably, the electric tool is an electric screwdriver, an electric angle grinder, an electric drilling machine or an electric wrench;
[0017] The speed regulating switch is integrated in the handle of the electric tool.
[0018] Preferably, the inner wall of the guide hole 11 is circumferentially formed with a limiting groove 13;
[0019] The rear of the push rod 3 is circumferentially formed with a limiting convex rib 31;
[0020] The outer diameter of the limiting convex rib 31 is greater than the inner diameter of the guide hole 11 and less than the inner diameter of the limiting groove 13;
[0021] The difference between the axial thickness of the limiting convex rib 31 and the axial thickness of the limiting groove 13 is consistent with the set distance.
[0022] Preferably, the set distance is greater than 0.5mm and less than 2mm.
[0023] Preferably, the push rod 3 is formed with a central through hole 32 in the axial direction thereof;
[0024] The inner diameter of the central through hole 32 is greater than the outer diameter of the reset coil spring 4;
[0025] The reset coil spring 4 passes through the central through hole 32, the front end abuts against the base 5, and the rear end abuts against the rear wall of the trigger 1.
[0026] Preferably, the front end of the damping coil spring 2 abuts against the rear end of the push rod 3;
[0027] The reset coil spring 4 is sleeved in the damping coil spring 2 at the rear end.
[0028] Preferably, the front part of the push rod 3 is formed with a front-and-back axis reset column 33, the middle and rear parts are formed with front-and-back axis damping holes 34, and the push rod 3 is provided with an isolation wall 35 between the reset column 33 and the damping hole 34.
[0029] The inner diameter of the reset coil spring 4 is greater than the outer diameter of the reset column 33.
[0030] The outer diameter of the damping coil spring 2 is less than the inner diameter of the damping hole 34.
[0031] The reset coil spring 4 is sleeved on the reset column 33 at the rear end and abuts against the isolation wall 35 of the push rod 3 at the rear end.
[0032] The damping coil spring 2 is sleeved in the damping hole 34 and abuts against the isolation wall 35 of the push rod 3 at the front end.
[0033] Preferably, the initial compression deformation elastic force F1 of the damping coil spring 2 in the released position of the trigger 1 is greater than the compression deformation force of the reset coil spring 4 when the front end of the push rod 3 abuts against the base 5.
[0034] The electric tool speed regulating switch of the utility model can effectively reduce the abrasion of the slide claw 7 relative to the printed circuit board 6, effectively improve the signal output stability of the speed regulating switch and the service life of the speed regulating switch. BRIEF DESCRIPTION OF DRAWINGS
[0035] In order to more clearly illustrate the technical scheme of the utility model, the following briefly introduces the drawings needed to be used by the utility model, and obviously, the drawings in the following description are only some embodiments of the utility model, and for the ordinary skilled in the art, other drawings can be obtained according to these drawings without paying creative labor.
[0036] Figure 1 It is a cross-sectional view of the prior electric tool speed regulating switch;
[0037] Figure 2 It is an explosion view of one embodiment of the electric tool speed regulating switch of the utility model;
[0038] Figure 3The trigger of the electric tool speed regulating switch one embodiment of the utility model is located at the release position section view;
[0039] Figure 4 The trigger of the electric tool speed regulating switch one embodiment of the utility model is located at the first press position section view;
[0040] Figure 5 The trigger of the electric tool speed regulating switch one embodiment of the utility model is located at the second press position section view;
[0041] Figure 6 The trigger of the electric tool speed regulating switch another embodiment of the utility model is located at the release position section view.
[0042] Mark explanation:
[0043] 1, trigger; 11, guide hole; 13, limit recess; 2, damping coil spring; 3, push rod; 31, limit convex rib; 32, center through hole; 4, reset coil spring; 5, base; 6, printed circuit board; 7, sliding claw; 33, reset column; 34, damping hole; 35, isolation wall. Specific implementation
[0044] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0045] The "first", "second" and similar words used in the application do not represent any order, quantity or importance, but are only used to distinguish different components. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right", "front", "back" and the like are only used to represent relative positional relationship, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0046] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.
[0047] Embodiment one
[0048] As Figures 2 to 6As shown, the electric tool speed regulating switch comprises a trigger 1, a damping coil spring 2, a push rod 3, a reset coil spring 4, a base 5, a printed circuit board 6 and a slide claw 7.
[0049] The lower side of the printed circuit board 6 is formed with a contact pad.
[0050] The base 5 is fixedly arranged below the printed circuit board 6.
[0051] The trigger 1 is formed with a front-to-back guide hole 11; the front end of the guide hole 11 is open, and the rear end is closed.
[0052] The rear part of the push rod 3 has a smaller outer diameter than the inner diameter of the guide hole 11.
[0053] The rear part of the push rod 3 is clamped in the guide hole 11, and the clamped push rod 3 can slide forward and backward within a set distance along the guide hole 11.
[0054] The rear part of the damping coil spring 2 is fitted in the guide hole 11 of the trigger 1, the front end abuts against the push rod 3, and the rear end abuts against the rear wall of the trigger 1.
[0055] The front end of the reset coil spring 4 abuts against the base 5, and the rear end abuts against the rear wall of the push rod 3 or the trigger 1.
[0056] The slide claw 7 is installed on the upper side of the front part of the push rod 3, and the tail end is pressed against the lower side of the printed circuit board 6.
[0057] Pressing or releasing the trigger 1 along the front-to-back direction can make the push rod 3 move forward or backward, and can make the push rod 3 move forward and backward relative to the trigger 1 within the set distance; the slide claw 7 installed on the push rod 3 moves linearly forward and backward along with the push rod 3, and the forward and backward movement of the slide claw 7 through the contact pad makes the contact pad change the on position or the off position.
[0058] The electric tool speed regulating switch can be widely applied to various high-vibration tools.
[0059] Preferably, the electric tool is a handheld electric tool, such as an electric screwdriver, an electric angle grinder, an electric drilling machine, an electric wrench or the like.
[0060] Preferably, the speed regulating switch is integrated in the handle of the electric tool.
[0061] The electric tool speed regulating switch of the embodiment one, in the case of electric tool working vibration, if the operator's finger cannot press the trigger 1 in the maximum stroke position (the push rod 3 moves to the most front position), the trigger 1 is driven repeatedly in the maximum stroke area (the first pressing position to the second pressing position of the trigger, the second pressing position is also the most front position of the push rod 3), and the slide claw 7 does not slide relative to the printed circuit board 6, thereby effectively reducing the wear of the slide claw 7 relative to the printed circuit board 6, effectively improving the signal output stability of the speed regulating switch and the service life of the speed regulating switch.
[0062] Embodiment two
[0063] Based on the electric tool speed regulating switch of the embodiment one, a limiting groove 13 is formed on the inner wall of the guide hole 11 in the circumferential direction;
[0064] A limiting convex rib 31 is formed on the rear part of the push rod 3 in the circumferential direction;
[0065] The outer diameter of the limiting convex rib 31 is greater than the inner diameter of the guide hole 11 and less than the inner diameter of the limiting groove 13;
[0066] The difference between the axial (front-to-back) thickness of the limiting convex rib 31 and the axial (front-to-back) thickness of the limiting groove 13 is consistent with the set distance.
[0067] Preferably, the set distance is greater than 0.5 mm and less than 2 mm.
[0068] The electric tool speed regulating switch of the embodiment two, through the cooperation of the limiting groove 13 on the rear inner wall of the guide hole 11 of the trigger 1 and the limiting convex rib 31 behind the push rod 3, the rear part of the push rod 3 is clamped in the guide hole 11, and the clamped push rod 3 can slide in the guide hole 11 within a set distance.
[0069] Embodiment three
[0070] Based on the electric tool speed regulating switch of the embodiment one, as shown, Figures 2 to 5 A central through hole 32 is formed on the push rod 3 in the axial direction;
[0071] The inner diameter of the central through hole 32 is greater than the outer diameter of the reset coil spring 4;
[0072] The reset coil spring 4 passes through the central through hole 32, with the front end abutting against the base 5 and the rear end abutting against the rear wall of the trigger 1.
[0073] Preferably, the front end of the damping coil spring 2 abuts against the rear end of the push rod 3.
[0074] The rear end of the reset coil spring 4 is sleeved in the damping coil spring 2.
[0075] The electric tool speed regulating switch of the third embodiment, as shown in Figure 3 The reset coil spring 4 is in the initial position, acting on the trigger 1, so that the trigger 1 is in the released position (natural state); the shock-absorbing coil spring 2 has an initial compression deformation elastic force F1, which can make the push rod 3 be pressed to the initial relative position of the guide hole of the trigger 1 (the limiting convex rib 31 is located at the front end of the limiting groove 13), and the push rod 3 drives the sliding jaw 7 to the initial position of the lower side of the printed circuit board 6, and the contact pad is disconnected.
[0076] As shown in Figure 4 , the trigger 1 is pressed forward until the trigger 1 reaches the first pressing position, and the reset coil spring 4 is compressed. During this process, the push rod 3 and the shock-absorbing coil spring 2 move forward with the trigger 1, and the shock-absorbing coil spring 2 is not compressed, and the initial compression deformation elastic force F1 still makes the push rod 3 be pressed to the initial relative position of the guide hole of the trigger 1 (the limiting convex rib 31 is located at the front end of the limiting groove 13), and when the trigger 1 reaches the first pressing position, the front end of the push rod 3 abuts against the base 5, and the push rod 3 is limited by the base 5 and is prohibited from moving forward; during this process, the push rod 3 drives the sliding jaw 7 to slide on the printed circuit board 6 and pass through the contact pad to change the connection or disconnection of the contact pad, thereby realizing the on-off and speed regulation functions of the electric tool switch.
[0077] As shown in Figure 5 , the trigger 1 is continuously pressed forward until the trigger 1 reaches the second pressing position, and the reset coil spring 4 is compressed. During this process, the push rod 3 has been limited by the base 5 and is prohibited from moving forward, so the shock-absorbing coil spring 2 is compressed, and the push rod 3 moves backward relative to the trigger 1 to the terminal relative position of the guide hole of the trigger 1 (the limiting convex rib 31 is located at the rear end of the limiting groove 13). During the process from the first pressing position to the second pressing position of the trigger 1, the sliding jaw 7 does not slide relative to the printed circuit board 6 and the contact pad thereof because the push rod 3 does not move.
[0078] As shown in Figure 5 , Figure 4 , the trigger 1 is released from the second pressing position, and under the compression deformation force of the reset coil spring 4, the trigger 1 retreats to the first pressing position, and the reset coil spring 4 is partially released. During this process, the shock-absorbing coil spring 2 is released, and the push rod 3 is limited by the shock-absorbing coil spring 2 and the base 5 and cannot move forward and backward, so the sliding jaw 7 does not slide relative to the printed circuit board 6 and the contact pad thereof.
[0079] As shown in Figure 3If the trigger 1 is continuously released from the first pressing position, the trigger 1 can continue to retreat to the release position under the compression deformation force of the reset coil spring 4, and the reset coil spring 4 is almost completely released. In this process, the damping coil spring 2 is compressed, the push rod 3 can move forward and backward, and thus the slide claw 7 can slide forward and backward relative to the printed circuit board 6 and its contact pad.
[0080] The damping coil spring 2 and the reset coil spring 4 of the power tool speed regulating switch of embodiment three can be connected in parallel and act on the trigger 1 at the rear end.
[0081] Embodiment four
[0082] Based on the power tool speed regulating switch of embodiment one, as shown in Figure 6 The push rod 3 is formed with a reset column 33 with an axis in the front-back direction at the front part, and a damping hole 34 with an axis in the front-back direction at the middle and rear part, and the push rod 3 retains an isolation wall 35 between the damping hole 34 and the reset column 33;
[0083] The inner diameter of the reset coil spring 4 is greater than the outer diameter of the reset column 33;
[0084] The outer diameter of the damping coil spring 2 is less than the inner diameter of the damping hole 34;
[0085] The reset coil spring 4 is sleeved on the outside of the reset column 33, and the rear end abuts against the isolation wall 35 of the push rod 3;
[0086] The damping coil spring 2 is sleeved in the damping hole 34, and the front end abuts against the isolation wall 35 of the push rod 3.
[0087] Preferably, the initial compression deformation elastic force F1 of the damping coil spring 2 when the trigger 1 is in the release position (natural state) is greater than the compression deformation force of the reset coil spring 4 when the front end of the push rod 3 abuts against the base 5.
[0088] The electric tool speed regulating switch of the embodiment four, the damping coil spring 2 and the reset coil spring 4 are in series acting on the push rod 3. The trigger 1 is pressed forward until the trigger 1 reaches the first pressing position, the reset coil spring 4 is compressed. In this process, the push rod 3 and the damping coil spring 2 move forward with the trigger 1, the damping coil spring 2 is not compressed, the initial compression deformation elastic force F1 makes the push rod 3 still under pressure in the initial relative position of the guide hole of the trigger 1 (the limiting convex rib 31 is located at the front end of the limiting groove 13), when the trigger 1 reaches the first pressing position, the front end of the push rod 3 abuts against the base 5, the push rod 3 is limited by the base 5 and is prohibited from moving forward; in this process, the push rod 3 drives the sliding claw 7 to slide on the printed circuit board 6 and pass through the contact pad to make the contact pad change the on position or off, so as to realize the on-off and speed regulating functions of the electric tool switch; the trigger 1 is continuously pressed forward until the trigger 1 reaches the second pressing position, the reset coil spring 4 is continuously compressed, in this process, since the push rod 3 is prohibited from moving forward by the base 5, the damping coil spring 2 is compressed, and the push rod 3 moves backward relative to the trigger 1 to the terminal relative position of the guide hole of the trigger 1 (the limiting convex rib 31 is located at the rear end of the limiting groove 13). In the process of the trigger 1 from the first pressing position to the second pressing position, since the push rod 3 does not move, the sliding claw 7 does not slide relative to the printed circuit board 6 and the contact pad (pad) thereof, so as to achieve the damping effect.
[0089] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A speed regulating switch for a power tool, characterized by, It includes trigger (1), shock-absorbing coil spring (2), push rod (3), reset coil spring (4), base (5), printed circuit board (6) and slide claw (7); The lower side of the printed circuit board (6) is formed with a contact pad; The base (5) is fixedly arranged below the printed circuit board (6); The trigger (1) is formed with a front-to-back guide hole (11); the front end of the guide hole (11) is open, and the rear end is closed; The rear outer diameter of the push rod (3) is smaller than the inner diameter of the guide hole (11); The rear part of the push rod (3) is clamped in the guide hole (11), and the clamped push rod (3) can slide forward and backward within a set distance along the guide hole (11); The rear part of the shock-absorbing coil spring (2) is fitted in the guide hole (11) of the trigger (1), the front end abuts against the push rod (3), and the rear end abuts against the rear wall of the trigger (1); The front end of the reset coil spring (4) abuts against the base (5), and the rear end abuts against the push rod (3) or the rear wall of the trigger (1); The head end of the slide claw (7) is installed on the upper side of the front part of the push rod (3), and the tail end is pressed to the lower side of the printed circuit board (6); Pressing or releasing the trigger (1) along the front-to-back direction can make the push rod (3) move forward or backward, and make the push rod (3) move forward and backward relative to the trigger (1) within the set distance, the slide claw (7) installed on the push rod (3) moves linearly forward and backward with the push rod (3), and the forward and backward movement of the slide claw (7) through the contact pad makes the contact pad change the on position or the off position.
2. The speed regulating switch of the electric tool according to claim 1, wherein the electric tool is a handheld electric tool.
3. The speed regulating switch of the electric tool according to claim 1, wherein the electric tool is an electric screwdriver, an electric angle grinder, an electric drilling machine or an electric wrench; and the speed regulating switch is integrated in a handle of the electric tool.
4. The speed regulating switch of the electric tool according to claim 1, wherein an inner wall of the guide hole (11) is formed with a limiting groove (13) in a circumferential direction; and a rear part of the push rod (3) is formed with a limiting protrusion (31) in a circumferential direction.
5. The speed regulating switch of the electric tool according to claim 1, wherein the set distance is greater than 0.5 mm and less than 2 mm.
6. The speed regulating switch of the electric tool according to claim 1, wherein the push rod (3) is formed with a central through hole (32) in an axial direction; an inner diameter of the central through hole (32) is greater than an outer diameter of the reset coil spring (4); and the reset coil spring (4) passes through the central through hole (32), abuts against the base (5) at a front end, and abuts against the rear wall of the trigger (1) at a rear end.
7. The speed regulating switch of the electric tool according to claim 1, wherein The damping coil spring (2) has its front end abutting against the rear end of the push rod (3); The return coil spring (4) has its rear end sleeved in the damping coil spring (2).
8. The speed regulating switch of the electric tool according to claim 1, characterized in that, The push rod (3) has a return column (33) with an axis in front-rear direction formed in its front part, and a damping hole (34) with an axis in front-rear direction formed in its middle and rear parts, and a partition wall (35) reserved between the damping hole (34) and the return column (33) in the push rod (3); The inner diameter of the return coil spring (4) is larger than the outer diameter of the return column (33); The outer diameter of the damping coil spring (2) is smaller than the inner diameter of the damping hole (34); The return coil spring (4) has its rear part sleeved outside the return column (33) and its rear end abutting against the partition wall (35) of the push rod (3); The damping coil spring (2) is sleeved in the damping hole (34) and has its front end abutting against the partition wall (35) of the push rod (3).
9. The speed regulating switch of the electric tool according to claim 8, characterized in that, The initial compression deformation elastic force of the damping coil spring (2) in the released position of the trigger (1) is greater than the compression deformation force of the return coil spring (4) when the front end of the push rod (3) abuts against the base (5).