Switch structure and electric tool

Abstract

The utility model discloses a switch structure and an electric tool, the switch structure comprises a switch assembly, a push button and a push rod, the push button and the push rod are movably connected, the push rod is elastically arranged along a first direction, the switch assembly comprises a fixedly arranged switch body and an elastic contact piece, one end of the elastic contact piece is connected with the switch body, and the other end of the elastic contact piece abuts against the push rod. The push button is suitable for pulling the push rod to move in the first direction and driving the trigger piece to be close to the switch body to trigger a switch signal, a limiting groove is formed in the lower portion of the end, away from the push rod, of the push button, a limiting protruding block is arranged at the bottom of the push button, and when the push button moves to the limiting position, the limiting protruding block is inserted into the limiting groove. The switch is simple in structure, and the switch can be turned on and turned off more stably and reliably while the safety performance is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of electric tools, in particular to a switch structure and an electric tool. Background Art

[0002] Handheld power tools are used to perform mechanical work, with or without a mounting bracket. They are designed to integrate the motor and mechanical components, making them easy to carry to the workplace and capable of being held, supported, or suspended for operation. Various handheld power tools, such as angle grinders, impact drills, and cutters, are commonly used in daily work. Traditionally, these handheld power tools often utilize push-button switches, which can be easily triggered and accidentally activated, potentially leading to safety incidents.

[0003] The Chinese utility model patent with authorization announcement number CN 201838466 U discloses a pull-rod switch structure for electric tools, which changes the traditional button-type switch method and adopts a push-pull method for switch control. It has a compact structure and is easy to operate. The operator can operate the machine and control the switch with one hand. At the same time, it effectively solves the problem of accidental touch that is prone to button-type switches. However, with long-term use, repeated wear makes the push knob unable to stay in the extreme position well, which easily leads to failure of the switch to open. In addition, although the pull rod has a tendency to keep retracting in this way, in order to balance the resistance of the push knob to move backward in the installation groove, the force to keep retracting will be very small, and may even disappear due to part failure in actual use. Therefore, when an external force pushes the push knob to move backward, the pull rod cannot effectively retract, and thus cannot be closed normally. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies of the prior art and to propose a switch structure and an electric tool with a simple structure, which can realize more stable and reliable opening and closing of the switch while ensuring safety performance.

[0005] The technical solution to achieve the purpose of this utility model is:

[0006] A switch structure includes a switch assembly and a push knob and a push rod that are movably connected. The push rod is elastically arranged along a first direction. The switch assembly includes a fixed switch body and an elastic contact piece connected to the switch body at one end and abutted against the push rod at the other end. The push knob is suitable for pulling the push rod to move along the first direction and driving the trigger piece to approach the switch body to trigger a switch signal. A limit groove is provided below the end of the push knob away from the push rod, and a limit protrusion is provided at the bottom of the push knob. When the push knob moves to the extreme position, the limit protrusion is inserted into the limit groove.

[0007] Further, a connecting portion is provided at the center of the bottom of the push-twist. A first through groove is formed at a position corresponding to the push rod on the push-twist. The connecting portion extends through the first through groove with a gap and extends below the first through groove.

[0008] Further, inclined surfaces that protrude toward the center and extend in the direction of the connecting portion are symmetrically provided in the middle of the first through groove. The shortest distance between the two inclined surfaces is less than the width of the connecting portion.

[0009] Further, the connecting portion includes an integrally formed connecting column and hook bodies symmetrically provided on both sides of the bottom of the connecting column. The hook bodies are limitedly provided below the first through groove.

[0010] Further, a blocking portion extending downward is provided at the bottom of the push rod. An arc-shaped extension portion is provided at the top of the elastic contact piece. The arc-shaped surface of the arc-shaped extension portion abuts against one side of the blocking portion close to the push-twist.

[0011] Further, a second through groove is formed on the side of the blocking portion. The second through groove is located directly above the switch assembly and is larger than the projection surface of the switch assembly.

[0012] An electric tool includes a housing and the switch structure as described above mounted on the housing. An installation groove is provided on the housing. The push-twist is slidably provided in the installation groove. The push rod and the switch assembly are respectively slidably and fixedly provided in the inner cavity of the housing. The limiting groove is formed at the front end of the installation groove. A first convex rib is provided at the bottom of the push-twist, so as to form a gap between the installation groove and the push-twist. The gap is larger than the depth of the limiting convex block inserted into the limiting groove.

[0013] Further, second convex ribs protruding upward are symmetrically provided at the top of the installation groove. The second convex ribs are vertically provided below the first convex rib and are in contact with the first convex rib.

[0014] Further, a third convex rib protruding upward is provided on one side of the limiting groove close to the push rod.

[0015] Further, a bent portion extending downward is provided at the bottom of the push rod. A limiting plate arranged in a first direction is provided in the housing along with the bent portion. A spring for restricting the forward movement of the push rod is provided between the limiting plate and the bent portion.

[0016] Adopting the above technical solutions, the utility model has the following beneficial effects:

[0017] (1) The present invention pushes and pulls the push rod by pushing and twisting, thereby pressing the elastic contact piece toward the switch body to trigger the switch signal, and provides a limiting protrusion at one end of the push rod, so that it is stuck in the limiting groove below to achieve fixation. Compared with the traditional fixation achieved by the resistance between the push rod and the installation groove, the switch is opened more reliably; at the same time, the push rod is elastically arranged along the first direction, and together with the elastic contact piece, it provides a retracting force for the push rod. By pressing the push rod away from one end of the limiting protrusion, the end of the push rod is tilted, the limiting protrusion is disengaged from the limiting groove, and the push rod pulls the push rod in the opposite direction to reset it; since the push rod no longer relies on being fixed to the installation groove, a greater restoring force can be applied to the push rod, thereby ensuring the reliability of the switch closing.

[0018] (2) The utility model realizes the movable connection between the push-twist and the push rod by inserting the gap of the connecting part into the first through groove, thereby driving the push rod to move. The structure is simple and the assembly is convenient.

[0019] (3) The present invention is capable of preventing the connection portion from moving backward relative to the push rod by setting a symmetrical inclined surface. When the push rod is stuck by a foreign object and cannot be reset by elastic force, the push rod can be forced to reset by pulling the push button with external force, thereby achieving shutdown and improving safety in use.

[0020] (4) The connection portion of the utility model adopts a hook structure composed of a connection column and a hook body, which prevents the connection portion from being separated from the first through groove and improves the connection reliability.

[0021] (5) The utility model provides an arc-shaped connecting portion at the top end of the elastic contact piece, so that the relative movement with the blocking portion is smoother and avoids jamming.

[0022] (6) The utility model reduces the difficulty of assembling the elastic contact piece and the blocking part by providing a second through groove directly above the switch assembly, and prevents the elastic contact piece from touching the top.

[0023] (7) The utility model provides a pressing space for the push-twist by means of the first ridge, and the structure is simple.

[0024] (8) The electric tool of the present invention is provided with a first ridge and a second ridge that contact each other, thereby reducing the contact surface during pushing and twisting sliding, reducing friction, and making the pushing and twisting smoother.

[0025] (9) The present invention provides a third ridge so that the limiting protrusion has a certain sense of frustration when passing through the third ridge, thereby preventing users from operating the device incorrectly.

[0026] (10) The utility model realizes elastic setting of the push rod along the first direction through a spring, and has a simple structure and is easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments in conjunction with the accompanying drawings, where:

[0028] Figure 1 It is a schematic internal structure diagram of the electric tool of the present utility model;

[0029] Figure 2 It is a schematic structural diagram of the switch assembly of the present utility model.

[0030] The reference numerals in the accompanying drawings are:

[0031] Switch assembly 1, switch body 1-1, elastic contact piece 1-2, push button 2, limit projection 2-1, connecting portion 2-2, first convex rib 2-3, push rod 3, bent portion 3-1, blocking portion 3-2, second through groove 3-3, first through groove 3-4, limit groove 4, limit plate 5, spring 6, third through groove 7, second convex rib 8, third convex rib 9. Specific embodiments

[0032] In order to better understand the above technical solutions, the following will detail the above technical solutions in conjunction with the accompanying drawings of the specification and specific embodiments.

[0033] (Embodiment 1)

[0034] As Figures 1 to 2 shown in the electric tool, which includes a housing and a switch structure installed on the housing. The switch structure includes a switch assembly 1, a push button 2 and a push rod 3. An installation groove is provided on the housing. The push button 2 is slidably arranged in the installation groove and is movably connected to the push rod 3. The push rod 3 is slidably arranged in the housing along the horizontal direction and is elastically connected to the housing, so that the push rod 3 always maintains a tendency to move backward. The switch assembly 1 includes a switch body 1-1 fixedly arranged in the housing and an elastic contact piece 1-2 inclined backward. The lower end of the elastic contact piece 1-2 is connected to the switch body 1-1, and the upper end is abutted against the push rod 3. When the push button 2 moves forward, the push rod 3 is pulled to move forward, and then the upper end of the elastic contact piece 1-2 is pressed against the switch body 1-1 to realize triggering of the switch signal. A limit groove 4 is provided at the front end of the installation groove and below the push button 2. A limit projection 2-1 is provided at the bottom of the push button 2. When the push button 2 moves forward to the limit position, the limit projection 2-1 is inserted into the limit groove 4 to realize fixation. Compared with the traditional structure, the opening of the switch is more reliable.

[0035] The bottom of the push rod 3 is provided with a bent portion 3-1 extending downward. A limit plate 5 is fixedly arranged in the casing at a position in front of the bent portion 3-1. A pre-compressed spring 6 is arranged between the limit plate 5 and the bent portion 3-1, so that the push rod 3 always maintains a tendency to move backward. The structure is simple and the assembly is convenient. The bottom of the push rod 3 is also provided with a blocking portion 3-2 extending downward. The top of the elastic contact piece 1-2 is provided with an arc-shaped extension portion. The arc-shaped surface of the arc-shaped extension portion abuts against the front side of the blocking portion 3-2, making the relative movement between the elastic contact piece 1-2 and the blocking portion 3-2 smoother and avoiding jamming. A second through groove 3-3 is formed on the side of the blocking portion 3-2. The second through groove 3-3 is located directly above the switch assembly 1 and is larger than the projection surface of the switch assembly 1, reducing the assembly difficulty of the elastic contact piece 1-2 and the blocking portion 3-2, and preventing the elastic contact piece 1-2 from hitting the top. At the same time, a through groove can be formed at the corresponding position of the casing and a transparent window can be installed, so that it can be directly seen whether the switch assembly 1 is successfully conducted, and it can be quickly judged whether it is a switch structure failure or an internal circuit failure when the electric tool switch fails.

[0036] A connecting portion 2-2 is provided at the center of the bottom of the push button 2. A third through groove 7 and a first through groove 3-4 are respectively formed at positions of the installation groove and the push rod 3 corresponding to the push button 2. The connecting portion 2-2 passes through the two through grooves with a gap and extends to the lower part of the first through groove 3-4, thereby realizing the movable connection between the push button 2 and the push rod 3. Specifically, the connecting portion 2-2 includes an integrally formed connecting column and hook bodies symmetrically arranged on both sides of the bottom of the connecting column. The hook bodies are limitedly arranged below the first through groove 3-4. The hook structure composed of the connecting column and the hook bodies is adopted to prevent the connecting portion from separating from the first through groove and improve the connection reliability.

[0037] The bottom of the push button 2 is provided with a first convex rib 2-3, so as to form a gap between the two ends of the installation groove and the push button 2, and this gap is larger than the depth of the limit convex block 2-1 inserted into the limit groove 4. By pressing the rear end of the push button 2, the front end of the push button 2 is lifted, the limit convex block 2-1 is separated from the limit groove 4, and the push rod 3 pulls the push button 2 to reset in the reverse direction, and the upper end of the elastic contact piece 1-2 is separated from the switch body 1-1. Since the push button 2 no longer depends on being fixed to the installation groove, a spring with a larger elastic force can be selected, so as to apply a greater restoring force on the push rod, thereby ensuring the reliability of the switch closing.

[0038] On both sides of the top of the installation groove, which are symmetrically located on both sides of the third through groove 7, there are second convex ribs 8 protruding upward. The second convex ribs 8 are vertically arranged below the first convex ribs 2-3 and are in contact with the first convex ribs 2-3, thereby reducing the contact surface when the push-twist 2 slides, reducing friction, and making the push-twist 2 push more smoothly. In the middle of the first through groove 3-4, there are inclined surfaces 3-1-1 protruding toward the center and extending forward symmetrically. The shortest distance between the two inclined surfaces is less than the width of the connecting portion 2-2, so as to be able to block the backward movement of the connecting portion 2-2 relative to the push rod 3. When the push rod 3 is stuck by foreign objects and cannot be reset by elastic force, the push-twist 2 can be pulled by an external force to drive the push rod 3 to be forcibly reset, thereby realizing shutdown and improving the use safety.

[0039] There is a third convex rib 9 protruding upward on the rear side close to the limiting groove 4, so that there is a certain sense of jerk when the limiting convex block 2-1 passes over the third convex rib 9, avoiding misoperation by the user and further improving the use safety.

[0040] In this embodiment, the push-twist 2 is used to pull the push rod 3, so that the elastic contact piece 1-2 is pressed against the switch body 1-1, realizing the triggering of the switch signal. And a limiting convex block 2-1 is arranged at one end of the push-twist 2, so as to be stuck into the lower limiting groove 4 to realize fixation. Compared with the traditional fixation realized by the resistance between the push-twist and the installation groove, the opening of the switch is more reliable; at the same time, the push rod 3 is elastically arranged in the first direction, and together with the elastic contact piece 1-2, it provides a force for the push rod 3 to retreat. By pressing one end of the push-twist 2 away from the limiting convex block, the end of the push-twist 2 is tilted up, and the limiting convex block 2-1 is separated from the limiting groove 4, and the push rod 3 pulls the push-twist 2 to reset in the reverse direction; since the push-twist 2 no longer depends on being fixed to the installation groove, a greater restoring force can be applied to the push rod, thereby ensuring the reliability of the switch closing.

[0041] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A switch structure, characterized in that: It includes a switch assembly, as well as a push button and a push rod that are movably connected. The push rod is elastically arranged in the first direction. The switch assembly includes a fixedly arranged switch body and an elastic contact piece with one end connected to the switch body and the other end abutted against the push rod. The push button is adapted to pull the push rod to move in the first direction and drive a trigger piece to approach the switch body to trigger a switch signal. A limiting groove is provided below one end of the push button away from the push rod, and a limiting protrusion is provided at the bottom of the push button. When the push button moves to the extreme position, the limiting protrusion is inserted into the limiting groove.

2. The switch structure according to claim 1, characterized in that:

3. The switch structure according to claim 2, characterized in that: A connecting portion is provided at the center of the bottom of the push button. A first through groove is formed at a position corresponding to the push rod on the push button. The connecting portion penetrates through the first through groove with a gap and extends below the first through groove.

4. A switch structure according to claim 3, characterized in that:

5. A switch structure according to claim 1, characterized in that: At the middle part of the first through groove, inclined surfaces that protrude towards the center and extend towards the connecting portion are symmetrically provided. The shortest distance between the two inclined surfaces is smaller than the width of the connecting portion.

6. The switch structure according to claim 5, wherein:

7. An electric tool, characterized in that: The connecting portion includes an integrally formed connecting column and hook bodies symmetrically arranged on both sides of the bottom of the connecting column. The hook bodies are limitedly arranged below the first through groove.

8. An electric tool according to claim 7, characterized in that:

9. An electric tool according to claim 7, characterized in that: A blocking portion extending downward is provided at the bottom of the push rod. An arc-shaped extending portion is provided at the top of the elastic contact piece. The arc-shaped surface of the arc-shaped extending portion abuts against one side of the blocking portion close to the push button.

10. An electric tool according to claim 7, characterized in that: A second through groove is formed at the side of the blocking portion. The second through groove is located directly above the switch assembly and is larger than the projection surface of the switch assembly. It includes a housing and the switch structure according to any one of claims 1 to 6 installed on the housing. An installation groove is provided on the housing. The push button slides in the installation groove. The push rod and the switch assembly are respectively slidably and fixedly arranged in the inner cavity of the housing. The limiting groove is opened at the front end of the installation groove. A first convex rib is provided at the bottom of the push button, so as to form a gap between the installation groove and the push button. The gap is larger than the depth of the limiting protrusion inserted into the limiting groove. Second convex ribs protruding upward are symmetrically provided at the top of the installation groove. The second convex ribs are vertically arranged below the first convex rib and are in contact with the first convex rib. A third convex rib protruding upward is provided at one side of the limiting groove close to the push rod. A bent portion extending downward is provided at the bottom of the push rod. A limiting plate arranged in the first direction is provided in the housing along with the bent portion. A spring for restricting the forward movement of the push rod is provided between the limiting plate and the bent portion.

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