A garden tool

Abstract

The application discloses a kind of garden electric tools, a kind of garden tool, including fuselage, the power unit on the prime mover is equipped with power part in the fuselage, the mechanical brake assembly that realizes brake to power part is equipped in the fuselage, the mechanical brake assembly includes brake control piece and position limiting piece;The brake control piece includes handle and first mechanical brake piece, the handle and first mechanical brake piece linkage;When the first mechanical brake piece is away from power part, it is the first position of brake control piece, when the first mechanical brake piece extrusion contact power part, it is the second position of brake control piece;The position limiting piece includes elastic piece, the position limiting piece is configured to let brake control piece maintain at first position or second position;The application is extruded by brake control piece contact power part to let power part decelerate or stop machine, and maintain brake state or non-brake state by elastic piece, simple structure, high reliability.

Description

Technical Field

[0001] This invention belongs to the field of power tool technology, and specifically relates to a garden tool. Background Technology

[0002] Chainsaws are a common garden tool, and during use, a braking device is typically used to slow down or stop the motor. In commercially available garden tools, electronic and mechanical brakes are usually used in combination for braking. Electronic brakes are only suitable for low-speed rotating garden tools, while mechanical brakes are suitable for high-speed rotating tools. However, mechanical brakes use V-shaped leaf springs to provide elasticity. The metal leaf springs abut against the plastic housing, and over time, the part of the housing abutting the leaf spring will wear down. Insufficient handle elasticity can also pose a safety hazard. Furthermore, the mechanical brakes described in the comparison document are not very reliable, and electronic brakes have certain limitations in their practical applications. Therefore, a more reliable garden tool needs to be designed. Summary of the Invention

[0003] This invention addresses the problems existing in the prior art by designing a garden tool. This invention uses a braking control component to squeeze and contact the power unit, thereby slowing down or stopping the power unit, and uses an elastic component to maintain the braking or non-braking state. The structure is simple and highly reliable.

[0004] The objective of this invention is achieved through the following technical solution: a garden tool, comprising a body, wherein a power unit of a prime mover is disposed within the body, and a mechanical braking assembly for braking the power unit is disposed within the body, the mechanical braking assembly comprising a braking control component and a position limiting component; the braking control component comprises a handle and a first mechanical brake pad, the handle and the first mechanical brake pad being linked; the first mechanical brake pad being in a first position when it is away from the power unit, and the first mechanical brake pad being in contact with the power unit when it is in a second position; the position limiting component comprises an elastic component, the position limiting component being configured to maintain the braking control component in the first position or the second position.

[0005] Preferably, a limiting part is provided on the side of the body opposite to the power unit relative to the brake control member; when the brake control member is in the first position, the mechanical brake assembly abuts against the limiting part.

[0006] The brake control component abuts against the limiting part, so that the brake control component cannot continue to rotate and will be maintained in the first position under the action of the position limiting part.

[0007] Preferably, the power unit of the prime mover is the outer rotor of the external rotor motor.

[0008] Preferably, the system also includes an electronic braking system and a control switch; the control switch is configured to be triggered by the braking control element; and the electronic braking system is configured to electronically brake the prime mover when the control switch is triggered.

[0009] The electronic braking system is activated when the control switch is triggered by the braking control component, and the electronic braking system can also decelerate the external rotor.

[0010] Preferably, the body is provided with a first connecting shaft, the brake control component is pivotally connected to the body via the first connecting shaft, and the handle and the first mechanical brake pad are respectively located on both sides of the first connecting shaft; the first end of the elastic component is connected to the body via a first connecting structure, and the second end of the elastic component is connected to the brake control component via a second connecting structure; when the brake control component moves between the first position and the second position, the distance between the first connecting structure and the second connecting structure changes.

[0011] The first connecting shaft is located inside the machine body, the handle extends outward from the machine body, and the first mechanical brake pad extends inward from the machine body. The brake control component is pivotally connected to the machine body, so that when the handle is turned, the first mechanical brake pad will move closer to or further away from the outer rotor; the first end of the elastic element is connected to the machine body, and the second end of the elastic element is connected to the brake control component. The length of the elastic element changes during the switching between the first and second positions of the brake control component.

[0012] Preferably, as the braking control member moves from the first position to the second position, the second connecting structure moves closer to the power unit.

[0013] Preferably, the second connecting structure is configured to be located between the first connecting shaft and the first connecting structure; when the braking control member is in the third position, the first connecting shaft, the first connecting structure and the second connecting structure are collinear; and when the braking control member is in the third position, the elastic member is not in a stretched state.

[0014] During the movement of the brake control component from the first position to the second position, the brake control component will pass through the third position. At this time, the first connecting shaft, the first connecting mechanism, and the second connecting structure are collinear. The elastic component is always in a compressed state and is compressed to its shortest length in the third position. The length of the elastic component in the first or second position is greater than its length in the third position. When the brake control component is in the third position, the length of the elastic component is not greater than its original length and is in a compressed state.

[0015] Preferably, the first connecting shaft is configured to be located between the first connecting structure and the second connecting structure; when the braking control member is in the third position, the first connecting shaft, the first connecting structure and the second connecting structure are collinear; and when the braking control member is in the third position, the elastic member is not in a compressed state.

[0016] During the movement of the brake control component from the first position to the second position, the brake control component will pass through the third position. At this time, the first connecting mechanism and the second connecting structure are collinear, the elastic component is always in a stretched state and is stretched to its maximum length in the third position; the length of the elastic component in the first or second position is less than the length in the third position; when the brake control component is in the third position, the length of the elastic component is not less than its original length and is always in a stretched state.

[0017] Preferably, the first end of the elastic element is pivotally connected to the fuselage via the first connecting structure; the second end of the elastic element is pivotally connected to the braking control element via the second connecting structure.

[0018] Preferably, the elastic element is configured as a tension spring; the first connecting structure includes a first shaft and a bushing; the first shaft is configured to be fixedly connected to the machine body; the bushing is configured to be rotatably sleeved on the first shaft; the first end of the elastic element is fixedly connected to the bushing; the second connecting structure includes a first pin, the first connecting shaft is disposed between the first pin and the first shaft, and the second end of the elastic element is pivotally connected to the first pin.

[0019] When the elastic element is in an uncompressed state, the first end of the elastic element is configured as a hook, so that the first end is always hooked on the bushing through the hook. When the elastic element rotates with the brake control component, the first end of the elastic element will never leave the bushing. Therefore, the first end of the elastic element and the bushing are in a relatively fixed connection state. The second end of the elastic element is also configured as a hook, and the second end of the elastic element is hooked on the first pin, so that the elastic element will always be in a stretched state.

[0020] Preferably, the bushing is constructed of a metallic material. The bushing is preferably made of aluminum or steel.

[0021] Preferably, the elastic element is constructed as a helical spring; the position limiting element further includes a spring seat, which is constructed to include a receiving cavity, the length of which is not less than the maximum length of the elastic element; one end of the spring seat is hinged to the braking control element via a second pin; the second end of the elastic element is fixedly connected to the spring seat.

[0022] The width of the receiving cavity is slightly larger than the diameter of the elastic element to prevent excessive radial deformation of the elastic element during movement. The receiving cavity houses the elastic element, with its second end abutting against the inner wall of the cavity and its first end abutting against the bushing surface. The maximum length of the elastic element refers to the greater of its length when the brake control element is in the first position and its length when the brake control element is in the second position. Therefore, the elastic element will always be in a compressed state when placed inside the spring seat.

[0023] Preferably, the first connection structure includes a first shaft and a bushing; the first shaft is configured to be fixedly connected to the body; the bushing is configured to be rotatably fitted onto the first shaft; the first end of the elastic member is fixedly connected to the bushing; and the shape of the end of the receiving cavity opposite to the second pin is adapted to the bushing.

[0024] The elastic element is installed inside the spring seat. The first end of the elastic element abuts against the surface of the bushing, and the second end of the elastic element abuts against the receiving cavity away from the bushing. The spring seat and the brake control element are hinged by the second pin. In this way, when the elastic element is in a compressed state, the spring seat will squeeze the brake control element. The first end of the elastic element is always in close contact with the surface of the bushing. The end of the receiving cavity away from the second pin is set to be an arc shape that conforms to the outer contour of the bushing, and the inner diameter of the arc shape is slightly larger than the outer diameter of the bushing. The inner diameter of the arc shape is the same as the width of the receiving cavity.

[0025] Preferably, the mechanical braking assembly further includes a second mechanical brake pad; the second mechanical brake pad is configured to be disposed on the braking control member or the position limiting member.

[0026] The first mechanical brake pad is fixedly connected to the mounting base, and the second mechanical brake pad is fixedly connected to the spring seat. The first and second mechanical brake pads are staggered vertically, and the external rotor is decelerated simultaneously by the two mechanical brake pads, which results in a better deceleration effect.

[0027] The beneficial effects of the present invention compared with the prior art will be explained in the detailed embodiments section. Attached Figure Description

[0028] Figure 1 This is a perspective view of the present invention;

[0029] Figure 2 This is a schematic diagram showing the first mechanical brake pad of the present invention in the first position;

[0030] Figure 3 This is a schematic diagram showing the first mechanical brake pad of the present invention in the second position;

[0031] Figure 4 This is an exploded view of the present invention;

[0032] Figure 5 This is an exploded view of the invention using a tension spring;

[0033] Figure 6 This is a diagram showing the usage state of the tension spring in this invention;

[0034] Figure 7 This is a schematic diagram showing the brake assembly in the first position when the present invention uses dual brake pads;

[0035] Figure 8 This is a schematic diagram showing the brake assembly in the second position when the present invention uses dual brake pads;

[0036] Figure 9 This is a diagram showing the usage state of the present invention;

[0037] Figure 10 This is a 3D view of the spring seat. Detailed Implementation

[0038] The present invention will be further described below with reference to the embodiments illustrated in the accompanying drawings:

[0039] Example 1

[0040] like Figures 1 to 10 As shown, this embodiment 1 discloses a garden tool, including a body 1. The body 1 has a power unit 2 from a prime mover, and a mechanical braking assembly 3 for braking the power unit 2. The mechanical braking assembly 3 includes a braking control component and a position limiting component. The braking control component includes a handle 31 and a first mechanical brake pad 32, which are linked. When the first mechanical brake pad 32 is away from the power unit 2, it is in a first position; when the first mechanical brake pad 32 is pressed against the power unit 2, it is in a second position. The position limiting component includes an elastic member 4, which is configured to maintain the braking control component in either the first or second position.

[0041] A limiting part 5 is provided on the side of the body 1 opposite to the power unit 2 relative to the brake control member; when the brake control member is in the first position, the mechanical brake assembly 3 abuts against the limiting part 5. The brake control member abuts against the limiting part 5, thus preventing further rotation and maintaining the first position under the action of the position limiting member. The power unit 2 on the prime mover is the outer rotor of an external rotor motor. In this embodiment, the prime mover is configured as a motor, and the power unit 2 is the outer rotor of an external rotor motor. In some embodiments, the prime mover is configured as an internal combustion engine, and the power unit 2 is configured to be connected to the output shaft as a driven disc. The body 1 is also provided with an electronic braking system and a control switch 6; the control switch 6 is configured to be triggered by the brake control member; the electronic braking system is configured to electronically brake the prime mover when the control switch 6 is triggered. The electronic braking system is activated simultaneously when the control switch 6 is triggered by the brake control member, and the external rotor can also be decelerated through the electronic braking system.

[0042] The body 1 is provided with a first connecting shaft 8. The brake control component is pivotally connected to the body 1 via the first connecting shaft 8. The handle 31 and the first mechanical brake pad 32 are respectively located on both sides of the first connecting shaft 8. The first end of the elastic element 4 is connected to the body 1 via a first connecting structure, and the second end of the elastic element 4 is connected to the brake control component via a second connecting structure. When the brake control component moves between the first position and the second position, the distance between the first connecting structure and the second connecting structure changes. The first connecting shaft 8 is located inside the body 1. The handle 31 extends outward from the body 1, and the first mechanical brake pad 32 extends inward from the body 1. The brake control component is pivotally connected to the body 1, so that when the handle 31 is rotated, the first mechanical brake pad 32 will move closer to or further away from the outer rotor. The first end of the elastic element 4 is connected to the body 1, and the second end of the elastic element 4 is connected to the brake control component. The length of the elastic element 4 changes during the switching between the first and second positions of the brake control component. During the movement of the brake control component from the first position to the second position, the second connecting structure moves closer to the power unit 2. The second connecting structure is configured to be located between the first connecting shaft 8 and the first connecting structure; when the brake control member is in the third position, the first connecting shaft 8, the first connecting structure, and the second connecting structure are collinear; and when the brake control member is in the third position, the elastic member 4 is not in a stretched state. During the process of the brake control member moving from the first position to the second position, the brake control member will pass through the third position. At this time, the first connecting shaft 8, the first connecting mechanism, and the second connecting structure are collinear, and the elastic member 4 is always in a compressed state and is compressed to its shortest length in the third position; the length of the elastic member 4 in the first or second position is greater than its length in the third position; when the brake control member is in the third position, the length of the elastic member 4 is not greater than its original length and is in a compressed state.

[0043] The first end of the elastic element 4 is pivotally connected to the fuselage 1 via the first connecting structure; the second end of the elastic element 4 is pivotally connected to the brake control element via the second connecting structure. The elastic element 4 is constructed as a helical spring; the position limiting member further includes a spring seat 35, which is constructed to include a receiving cavity, the length of which is not less than the maximum length of the elastic element 4; one end of the spring seat 35 is hinged to the brake control element via a second pin 36; the second end of the elastic element 4 is fixedly connected to the spring seat 35. The width of the receiving cavity is slightly larger than the diameter of the elastic element 4 to prevent excessive radial deformation of the elastic element 4 during movement. The receiving cavity is used to house the elastic element 4, the second end of the elastic element 4 abuts against the inner wall of the receiving cavity, and the first end of the elastic element 4 abuts against the surface of the bushing 37; the maximum length of the elastic element 4 refers to the larger of the length of the elastic element 4 when the brake control element is in the first position and the length of the elastic element 4 when the brake control element is in the second position. Therefore, the elastic element 4 will always be in a compressed state when placed in the spring seat 35. The first connecting structure includes a first shaft 34 and a bushing 37. The first shaft 34 is configured to be fixedly connected to the body 1. The bushing 37 is configured to be rotatably fitted onto the first shaft 34. The first end of the elastic member 4 is fixedly connected to the bushing 37. The shape of the end of the receiving cavity opposite to the second pin 36 is adapted to the bushing 37. The elastic member 4 is installed in a spring seat 35. The first end of the elastic member 4 abuts against the surface of the bushing 37, and the second end of the elastic member 4 abuts against the receiving cavity opposite to the bushing 37. The spring seat 35 is hinged to the brake control member through the second pin 36, so that when the elastic member 4 is in a compressed state, the spring seat 35 will squeeze the brake control member. The first end of the elastic member 4 is always in close contact with the surface of the bushing 37. The end of the receiving cavity opposite to the second pin 36 is set to be an arc shape that conforms to the outer contour of the bushing 37, and the inner diameter of the arc is slightly larger than the outer diameter of the bushing 37. The inner diameter of the arc is the same as the width of the receiving cavity.

[0044] The specific working process of this embodiment is as follows: During use, the power unit 2 of the garden tool is in a high-speed rotating state. At this time, the first mechanical brake pad 32 is in the first position, and the mechanical brake assembly 3 is in a non-braking state. When the handle 31 is pulled, the handle 31 and the mounting base 33 rotate counterclockwise synchronously around the first connecting shaft 8. When the handle 31 rotates, it contacts the protrusion 7 and touches the control switch 6, and the control switch 6 disconnects the circuit. When the circuit is disconnected, the power unit 2 will continue to rotate under the action of inertia. During the rotation of the handle 31, the first mechanical brake pad 32 will rotate from the third position to the second position. When the first mechanical brake pad 32 is in the second position, it will squeeze and contact the power unit 2 to decelerate or stop the power unit 2.

[0045] The working principle of the first mechanical brake pad 32 staying in the first position or the second position is as follows. The distance between the first connecting shaft 8 and the second pin shaft 36 always remains unchanged and is L1. The distance between the second pin shaft 36 and the first shaft 34 changes and is L2. The distance between the first connecting shaft 8 and the first shaft 34 remains unchanged and is L3. When the first mechanical brake pad 32 is in the third position, at this time, the mounting seat 33 and the spring seat 35 are on the same straight line, and L3 = L1 + L2. At this time, the compression spring 41 in the spring seat 35 is compressed to the shortest position and has the maximum elastic force. Pull the handle 31. When the mounting seat 33 comes into extrusion contact with the limiting part 5, the mounting seat 33 cannot rotate further, so the first mechanical brake pad 32 will stay in the first position. When the first mechanical brake pad 32 on the mounting seat 33 comes into extrusion contact with the power part 2, the first mechanical brake pad 32 cannot rotate further and is in the second position, so the mechanical brake assembly 3 is in the braking state. When the first mechanical brake pad 32 is in the first position or the second position, the mounting seat 33 and the spring seat 35 are not on the same straight line. At this time, L3 < L1 + L2, the position of the second pin shaft 36 will move away from the first shaft 34, and L2 will become longer. The mounting seat 33 and the spring seat 35 are hinged. During the rotation of the mounting seat 33, it will move away from the first shaft 34 and will also带动 the spring seat 35 to move together. When the spring seat 35 moves, the compression spring 41 in the spring seat 35 will elongate and the elastic deformation amount will decrease. Because the elastic deformation amount of the compression spring 41 is the largest when the first mechanical brake pad 32 is in the third position. If the first mechanical brake pad 32 wants to move from the first position or the second position to the third position, it needs to overcome the elastic force of the compression spring 41 to make the handle 31带动 the mounting seat 33 to rotate. Therefore, without the action of external force, the compression spring 41 in the spring seat 35 will挤压 the spring seat 35, and the spring seat 35 will挤压 the mounting seat 33, so that the first mechanical brake pad 32 on the mounting seat 33 always stays in the first position or the second position.

[0046] The power part 2 is connected to the saw chain 10 and带动 it to rotate. Press the mechanical brake assembly 3. When the first mechanical brake pad 32 is in the second position, the saw chain 10 stops rotating. Pull the mechanical brake assembly 3. When the first mechanical brake pad 32 is in the first position, the saw chain 10 can rotate normally.

[0047] Embodiment 2

[0048] As Figures 1 to 6As shown, this embodiment discloses a method of using a tension spring 42 to maintain the first mechanical brake pad 32 in a first position or a second position. The other structures are the same as in embodiment 1, except that the structure and installation method of the elastic element 4 are different. The elastic element 4 is constructed as a tension spring 42. The first connecting structure includes a first shaft 34 and a bushing 37. The first shaft 34 is constructed to be fixedly connected to the body 1. The bushing 37 is constructed to be rotatably sleeved on the first shaft 34. The first end of the elastic element 4 is fixedly connected to the bushing 37. The second connecting structure includes a first pin 9. The first connecting shaft 8 is disposed between the first pin 9 and the first shaft 34. The second end of the elastic element 4 is pivotally connected to the first pin 9. When the elastic element 4 is in an uncompressed state, its first end is configured as a hook, so that the first end is always hooked onto the bushing 37. As the elastic element 4 rotates with the brake control component, the first end of the elastic element 4 will never leave the bushing 37, thus maintaining a relatively fixed connection between the first end of the elastic element 4 and the bushing 37. The second end of the elastic element 4 is also configured as a hook, hooking onto the first pin 9, so that the elastic element 4 is always in a stretched state. The bushing 37 is constructed of a metal material. Preferably, the bushing 37 is made of aluminum or steel.

[0049] The working principle of the first mechanical brake pad 32 maintaining the first or second position is as follows: the distance between the first pin 9 and the first shaft 34 changes with the rotation of the handle 31 and is S1. When the first mechanical brake pad 32 is in the third position, the mounting base 33 and the tension spring 42 are in a straight line. At this time, the first connecting shaft 8 is located between the first pin 9 and the first shaft 34, and the distance between the first pin 9 and the first shaft 34 is the largest, that is, S1 is the largest, so the tension of the tension spring 42 is the largest. When the mounting base 33 rotates to a position where it is not in a straight line with the tension spring 42, the mounting base 32... 3 will move closer to the power unit 2 or the limiting part 5 on the housing, and at the same time, the position of the first pin 9 will move closer to the first shaft 34, so S1 will become smaller, and the tension of the tension spring 42 will become smaller. When the first mechanical brake pad 32 switches from the first position or the second position to the third position, it is necessary to stretch the tension spring 42 by external force to overcome the elastic force of the tension spring 42, so that the mounting base 33 and the tension spring 42 will rotate relative to each other. Therefore, the first mechanical brake pad 32 will always maintain the corresponding first position or second position when it is not subjected to external force.

[0050] Example 3

[0051] like Figure 7 and Figure 8As shown, in this embodiment, a first mechanical brake pad 32 is provided on the mounting base 33, and a second mechanical brake pad is provided on the spring seat 35; other structures are the same as in embodiment 1. The mounting base 33 is fixedly connected to the first mechanical brake pad 32, and the spring seat 35 is provided with the second mechanical brake pad. The first mechanical brake pad 32 and the second mechanical brake pad are staggered vertically along the axial direction of the first connecting shaft 8.

[0052] The specific working process of this embodiment is as follows: When the handle 31 is turned, the mounting base 33 rotates at the same time. The mounting base 33 and the spring seat 35 are hinged to each other. When the mounting base 33 rotates, the spring seat 35 will rotate. During the rotation of the mounting base 33, the first mechanical brake pad 32 fixedly connected to it will move closer to the power unit 2. During the rotation of the spring seat 35, the second mechanical brake pad fixedly connected to it will move closer to the power unit 2. In this way, the first mechanical brake pad 32 and the second mechanical brake pad will simultaneously squeeze and contact the power unit 2, increasing the contact area between the power unit 2 and the brake control component. This will improve the braking effect of the brake control component.

[0053] This invention uses a braking control component to move a first mechanical brake pad closer to or away from the power unit. The first mechanical brake pad is in a first position when it moves away from the power unit; it is in a second position when it comes into contact with the power unit. At this point, the motor rotor decelerates or stops. The braking control component includes a handle and a first mechanical brake pad. The handle controls the rotation of the first mechanical brake pad, which is simple, reliable, and stably decelerates the power unit. The mechanical braking assembly also includes a position limiting component, which includes an elastic element. This position limiting component is structurally stable and produces good force even after prolonged operation. When the braking control component is not subjected to external force, the elastic element keeps the first mechanical brake pad in the corresponding first or second position, ensuring reliability and stability. Therefore, this invention provides a simple and reliable method for decelerating or stopping the power unit of garden tools.

[0054] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A gardening tool, comprising a body, characterized in that, The fuselage contains a power unit for a prime mover and a mechanical braking assembly for braking the power unit. The mechanical braking assembly includes a braking control component and a position limiting component. The braking control component includes a handle and a first mechanical brake pad, which are linked together. The first position of the braking control component is when the first mechanical brake pad is away from the power unit, and the second position of the braking control component is when the first mechanical brake pad is pressed against the power unit. The position limiting component includes an elastic element, which is configured to maintain the braking control component in either the first or second position. The fuselage is provided with a first connecting shaft, and the brake control component is pivotally connected to the fuselage via the first connecting shaft. The handle and the first mechanical brake pad are respectively located on both sides of the first connecting shaft. The first end of the elastic component is connected to the fuselage via a first connecting structure, and the second end of the elastic component is connected to the brake control component via a second connecting structure. When the brake control component moves between the first position and the second position, the distance between the first connecting structure and the second connecting structure changes. During the process of the brake control component moving from the first position to the second position, the brake control component will pass through the third position. When the brake control component is in the third position, the first connecting shaft, the first connecting structure and the second connecting structure are collinear. The length of the elastic element in the first or second position is greater than its length in the third position; The machine body is provided with a limiting part, and when the braking control component is in the first position, the mechanical braking assembly abuts against the limiting part.

2. The garden tool according to claim 1, characterized in that, The limiting part is located on the side of the fuselage opposite to the power part relative to the braking control component.

3. The garden tool according to claim 1, characterized in that, The power unit on the prime mover is the outer rotor of the external rotor motor.

4. The garden tool according to claim 1, characterized in that, It also includes an electronic braking system and a control switch; the control switch is configured to be triggered by the braking control element; the electronic braking system is configured to electronically brake the prime mover when the control switch is triggered.

5. The garden tool according to claim 1, characterized in that, As the braking control component moves from the first position to the second position, the second connecting structure moves closer to the power unit.

6. The garden tool according to claim 1, characterized in that, The second connecting structure is configured to be located between the first connecting shaft and the first connecting structure; when the braking control member is in the third position, the elastic member is not in a stretched state.

7. The garden tool according to claim 1, characterized in that, The first connecting shaft is configured to be located between the first connecting structure and the second connecting structure; when the braking control element is in the third position, the elastic element is not in a compressed state.

8. The garden tool according to claim 1, characterized in that, The first connection structure includes a first shaft and a bushing; the first shaft is configured to be fixedly connected to the machine body; the bushing is configured to be rotatably fitted onto the first shaft; and the first end of the elastic member is fixedly connected to the bushing.

9. The garden tool according to claim 8, characterized in that, The bushing is constructed to be made of a metallic material.

10. The garden tool according to claim 1, characterized in that, The elastic element is configured as a helical spring; the position limiting element further includes a spring seat, which is configured to include a receiving cavity, the length of which is not less than the maximum length of the elastic element; one end of the spring seat is hinged to the braking control element via a second pin; the second end of the elastic element is fixedly connected to the spring seat.

11. The garden tool according to claim 10, characterized in that, The first connection structure includes a first shaft and a bushing; the first shaft is configured to be fixedly connected to the body; the bushing is configured to be rotatably fitted onto the first shaft; the first end of the elastic member is fixedly connected to the bushing; the shape of the end of the receiving cavity opposite to the second pin is adapted to the bushing.

12. The garden tool according to claim 1, characterized in that, The mechanical braking assembly further includes a second mechanical brake pad; the second mechanical brake pad is configured to be disposed on the braking control member or the position limiting member.

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