Power tool

Abstract

The application discloses an electric tool, which comprises a casing, a driving part, a transmission assembly and a shearing blade. The driving part is installed in the casing. The transmission assembly comprises a transmission gear matched with the driving part, an eccentric shaft installed on the transmission gear and a swing lever movably matched with the eccentric shaft. The transmission gear and the eccentric shaft are offset from each other. The swing lever is provided with a first magnetic connecting part. The shearing blade is provided with a second magnetic connecting part. The opposite magnetic poles of the first magnetic connecting part and the second magnetic connecting part are arranged oppositely. In a first state, the swing lever drives the shearing blade to move. When the shearing blade is stuck and causes the driving part to stall, the driving part can separate the first magnetic connecting part from the second magnetic connecting part, thereby protecting the driving part. When the first magnetic connecting part and the second magnetic connecting part are reconnected, the first magnetic connecting part of the swing lever exerts an impact force on the shearing blade, helps the shearing blade to get rid of the stuck state and enables the electric tool to return to normal operation.

Description

Technical Field

[0001] This application belongs to the field of tool technology, specifically relating to an electric tool. Background Technology

[0002] Power tools are portable or handheld mechanical devices powered by electricity (battery or external power source) to perform tasks such as trimming, cutting, drilling, and grinding. They are widely used in various fields such as construction, manufacturing, and household use.

[0003] Trimming power tools typically consist of a drive unit, a transmission assembly, and shearing blades. The drive unit and transmission assembly drive the shearing blades in a reciprocating shearing motion. Friction exists between the transmission assembly and the shearing blades, affecting the tool's lifespan. Furthermore, when the drive unit stalls, the upper and lower shearing blades can easily jam, causing the tool to malfunction.

[0004] Therefore, it is necessary to provide an electric tool to address the aforementioned technical problems. Utility Model Content

[0005] The purpose of this application is to provide a power tool that can solve the problem that the upper and lower cutting blades are prone to jamming when the power tool stalls, thus affecting the normal operation of the tool.

[0006] To achieve the above objectives, a specific embodiment of this application provides the following technical solution:

[0007] An electric tool includes a housing, a drive unit, a transmission assembly, and a cutting blade. The drive unit is installed inside the housing. The transmission assembly includes a transmission gear that cooperates with the drive unit, an eccentric shaft mounted on the transmission gear, and a lever that is movably fitted to the eccentric shaft. The axes of the transmission gear and the eccentric shaft are offset from each other. The lever is provided with a first magnetic connection portion. The cutting blade is provided with a second magnetic connection portion. The opposite magnetic poles of the first magnetic connection portion and the second magnetic connection portion are arranged opposite to each other. In a first state, the lever drives the cutting blade to move.

[0008] In one or more embodiments of this application, in the second state, the maximum driving force of the driving member on the swing arm is greater than the magnetic attraction force between the first magnetic connection and the second magnetic connection, and the driving member drives the first magnetic connection to disengage from the second magnetic connection.

[0009] In one or more embodiments of this application, when the swing arm drives the shearing blade to move, the first magnetic connection portion is rotated relative to the second magnetic connection portion about a predetermined axis.

[0010] In one or more embodiments of this application, the housing is further provided with a limiting member that restricts the movement of the free end of the swing arm having the first magnetic connection portion.

[0011] In one or more embodiments of this application, the limiting member is arc-shaped and arches toward the direction of the swing arm.

[0012] In one or more embodiments of this application, a first mounting hole is provided at the end of the swing arm away from the eccentric shaft, and the first magnetic connection part is installed in the first mounting hole.

[0013] In one or more embodiments of this application, a second mounting hole is provided at one end of the shearing blade near the swing arm, and the second magnetic connection portion is mounted in the second mounting hole.

[0014] In one or more embodiments of this application, the first magnetic connection portion and the second magnetic connection portion are configured as magnets.

[0015] In one or more embodiments of this application, the transmission assembly includes two swing arms, and two shearing blades are provided, with each swing arm and shearing blade connected in a one-to-one correspondence.

[0016] In one or more embodiments of this application, the two connection points of the two sets of swing arms and the shearing blade are staggered in a direction perpendicular to the reciprocating motion of the shearing blade.

[0017] Compared to existing technologies, in the operation of the power tool of this application, the drive component drives the transmission gear to rotate, which in turn drives the rocker arm to move via the eccentric shaft, thereby driving the shearing blade to perform shearing motion. The rocker arm and the shearing blade are connected to each other through a first magnetic connection and a second magnetic connection. When the shearing blade jams, causing the drive component to stall, the drive component forces the first and second magnetic connections to separate, thereby protecting the drive component. When the first and second magnetic connections reconnect, the first magnetic connection of the rocker arm can apply an impact force to the shearing blade, helping the shearing blade to disengage from the jammed state and allowing the power tool to resume normal operation. Simultaneously, this application eliminates the need for a riveting joint between the rocker arm and the shearing blade, further reducing friction between the mounting hole walls of the rocker arm and the shearing blade and the riveting joint, thus extending the service life of the power tool. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a power tool according to one embodiment of this application;

[0020] Figure 2 This is a partial cross-sectional structural diagram of a power tool according to one embodiment of this application;

[0021] Figure 3 This is a schematic diagram of the engagement of the transmission assembly and the shearing blade of a power tool in a first state according to an embodiment of this application;

[0022] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a schematic diagram of the engagement of the transmission assembly and the shearing blade of the power tool in a second state according to an embodiment of this application;

[0024] Figure 6 for Figure 5 Enlarged diagram of point B in the middle.

[0025] Explanation of key figure labels:

[0026] 1. Housing; 2. Drive component; 3. Transmission assembly; 31. Transmission gear; 32. Eccentric shaft; 33. Rocker arm; 331. First magnetic connection part; 332. First mounting hole; 4. Shearing blade; 41. Second magnetic connection part; 42. Second mounting hole; 5. Limiting component. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0028] Reference Figure 1 The power tools in this application include, but are not limited to, hedge trimmers, tea pickers, and hair clippers. This embodiment and the accompanying drawings illustrate the power tools of this application using a hedge trimmer as an example, but this is not intended to limit their type.

[0029] Reference Figure 1 and Figure 2 In one embodiment of this application, the power tool includes a housing 1, a drive component 2, a transmission assembly 3, and a cutting blade 4.

[0030] Reference Figures 2 to 4 The drive component 2 is installed inside the housing 1. The transmission assembly 3 includes a transmission gear 31 that cooperates with the drive component 2, an eccentric shaft 32 installed on the transmission gear 31, and a rocker arm 33 that is movably cooperated with the eccentric shaft 32. The axes of the transmission gear 31 and the eccentric shaft 32 are offset from each other. The rocker arm 33 is provided with a first magnetic connection part 331. (Refer to...) Figure 5 and Figure 6 The shearing blade 4 is provided with a second magnetic connection part 41. The opposite magnetic poles of the first magnetic connection part 331 and the second magnetic connection part 41 are arranged opposite to each other. In the first state, the swing arm 33 drives the shearing blade 4 to move. Figure 3 and Figure 4 A schematic diagram showing the engagement of the transmission assembly and the shearing blade of a power tool in its first state is shown.

[0031] Specifically, in the first state, the drive component 2 drives the transmission gear 31 to rotate, which in turn drives the rocker arm 33 to move via the eccentric shaft 32, thereby driving the shearing blade 4 to move. In this embodiment, the drive component 2 can be a motor, which drives the transmission assembly 3 to run, thereby driving the shearing blade 4 to move.

[0032] Figure 5 and Figure 6 The diagram illustrates the engagement of the transmission assembly and the shearing blade in the second state of the power tool. In the second state, the maximum driving force of the drive member 2 on the lever 33 is greater than the magnetic attraction between the first magnetic connection 331 and the second magnetic connection 41, causing the drive member 2 to disengage the first magnetic connection 331 from the second magnetic connection 41. Therefore, when the shearing blade 4 is stuck, causing the drive member 2 to stall, the drive member 2 can drive the first magnetic connection 331 and the second magnetic connection 41 to separate, thereby protecting the drive member 2.

[0033] Specifically, in this embodiment, the magnetic attraction between the first magnetic connection 331 and the second magnetic connection 41 can be set by the maximum output torque of the driving component 2 (such as a motor). When the output torque of the driving component 2 reaches its maximum value, the driving component 2 exerts maximum driving force on the rocker arm 33 to drive the first magnetic connection 331 to disengage from the second magnetic connection 41, thereby protecting the driving component 2.

[0034] Therefore, when the power tool is operating normally, it is in the first state, where the drive unit 2 drives the shearing blade 4 to perform shearing motion through the transmission assembly 3 for pruning branches. When the shearing blade 4 gets stuck in a branch-jamming state, causing the drive unit 2 to stall, the power tool can switch to the second state to disengage the first magnetic connection part 331 from the second magnetic connection part 41, thereby protecting the drive unit 2.

[0035] Reference Figure 2 and Figure 3The transmission assembly 3 includes two swing arms 33 and two shearing blades 4, with each swing arm 33 connected to a corresponding shearing blade 4. The two connection points between the two sets of swing arms 33 and the shearing blades 4 are staggered in the direction perpendicular to the reciprocating motion of the shearing blades 4. This staggered arrangement of the two connection points avoids magnetic interference between the two sets of swing arms 33 and the shearing blades 4, thereby ensuring the independent operation of the two shearing blades 4 for pruning branches.

[0036] Reference Figure 4 and Figure 6 The end of the swing arm 33 furthest from the eccentric shaft 32 has a first mounting hole 332, and the first magnetic connection part 331 is installed in the first mounting hole 332. The end of the shearing blade 4 near the swing arm 33 has a second mounting hole 42, and the second magnetic connection part 41 is installed in the second mounting hole 42. In this embodiment, the first magnetic connection part 331 and the second magnetic connection part 41 are magnets. In other embodiments, the first magnetic connection part 331 and the second magnetic connection part 41 may also be formed by magnetizing other materials so that the first magnetic connection part 331 and the second magnetic connection part 41 can attract each other. This application does not limit this.

[0037] Reference Figure 4 and Figure 6 When the lever 33 drives the shearing blade 4 to move, the first magnetic connection part 331 is rotatably mounted relative to the second magnetic connection part 41 around a predetermined axis. Compared to existing designs, where a rivet is provided between the lever 33 and the shearing blade 4, and the rivet passes through the first mounting hole 332 and the second mounting hole 42, allowing the first magnetic connection part 331 to rotate relative to the second magnetic connection part 41 around a predetermined axis, this application eliminates the need for a rivet by using the magnetic connection between the first magnetic connection part 331 and the second magnetic connection part 41. Furthermore, friction between the walls of the first mounting hole 332 of the lever 33 and the second mounting hole 42 of the shearing blade 4 and the rivet is avoided, thus extending the service life of the power tool. Further, by avoiding the aforementioned friction, power consumption is also reduced, increasing the power tool's runtime.

[0038] Reference Figure 4 and Figure 6The housing 1 is also provided with a limiting member 5, which restricts the movement of the free end of the swing arm 33 having the first magnetic connection portion 331. The limiting member 5 is arc-shaped and arches towards the swing arm 33. The limiting member 5 can restrict the movement of the free end of the swing arm 33 within a limited space. When the shearing blade 4 jams, causing the drive member 2 to stall, the drive member 2 separates the first magnetic connection portion 331 and the second magnetic connection portion 41, thereby protecting the drive member 2. Since the limiting member 5 can restrict the movement of the free end of the swing arm 33, when the first magnetic connection portion 331 and the second magnetic connection portion 41 move to re-attract each other, the first magnetic connection portion 331 of the swing arm 33 can apply a certain impact force to the shearing blade 4, thereby helping the shearing blade 4 to disengage from the jammed state and allowing the power tool to resume normal operation.

[0039] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A power tool characterized by comprising: include: Casing (1); The drive unit (2) is installed inside the housing (1); The transmission assembly (3) includes a transmission gear (31) that cooperates with the drive member (2), an eccentric shaft (32) mounted on the transmission gear (31), and a rocker arm (33) that is movably fitted to the eccentric shaft (32). The axes of the transmission gear (31) and the eccentric shaft (32) are offset from each other, and the rocker arm (33) is provided with a first magnetic connection part (331). The shearing blade (4) is provided with a second magnetic connection part (41). The opposite magnetic poles of the first magnetic connection part (331) and the second magnetic connection part (41) are arranged opposite to each other. In the first state, the swing rod (33) drives the shearing blade (4) to move.

2. The power tool of claim 1, wherein, In the second state, the maximum driving force of the driving member (2) on the swing rod (33) is greater than the magnetic attraction between the first magnetic connection part (331) and the second magnetic connection part (41), and the driving member (2) drives the first magnetic connection part (331) to disengage from the second magnetic connection part (41).

3. The power tool of claim 1, wherein, When the swing arm (33) drives the shearing blade (4) to move, the first magnetic connection part (331) is rotated relative to the second magnetic connection part (41) around a predetermined axis.

4. The power tool according to claim 3, characterized in that, The housing (1) is also provided with a limiting member (5), which restricts the movement of the free end of the swing arm (33) having the first magnetic connection part (331).

5. The power tool according to claim 4, characterized in that, The limiting member (5) is arc-shaped and arches toward the swing arm (33).

6. The power tool according to claim 1, characterized in that, The swing arm (33) has a first mounting hole (332) at the end away from the eccentric shaft (32), and the first magnetic connection part (331) is installed in the first mounting hole (332).

7. The power tool according to claim 1, characterized in that, The shearing blade (4) has a second mounting hole (42) at one end near the swing arm (33), and the second magnetic connection part (41) is installed in the second mounting hole (42).

8. The power tool according to claim 1, characterized in that, The first magnetic connection part (331) and the second magnetic connection part (41) are configured as magnets.

9. The power tool according to claim 1, characterized in that, The transmission assembly (3) includes two swing arms (33), and two shearing blades (4) are provided. The swing arms (33) and the shearing blades (4) are connected in a one-to-one correspondence.

10. The power tool according to claim 9, characterized in that, The two connection points of the two sets of swing arms (33) and the shearing blade (4) are staggered in the direction perpendicular to the reciprocating motion of the shearing blade (4).

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