Garden tools

Abstract

The present invention provides a gardening tool, which includes a power component, a transmission component and a working component. The working component includes a blade bar, a fixing seat and a fixing pin for connecting the blade bar with the transmission component. Define the force when the fixing pin breaks as F. When the force borne by the fixing pin is less than F, the gardening tool works normally. When the force borne by the fixing pin is greater than F, the fixing pin breaks and the gardening tool stops working. Among them, define the load force borne by the transmission component when it works normally as F1, and the maximum load force that the transmission component can bear as F2. Then F1 / N < F < F2 / N, where N is the number of fixing pins installed on one fixing seat. Compared with the prior art, by using the fixing pin structure, when the impact force received by the blade bar is greater than the force F when the fixing pin breaks, the fixing pin breaks, and the blade bar and the transmission component are unloaded, thereby avoiding damage to the transmission component.

Description

Technical Field

[0001] The present invention relates to the technical field of gardening equipment, and particularly to a gardening tool. Background Art

[0002] In the actual working process of gardening tools, especially lawn mowers, when the cutter bar encounters obstacles such as tree branches and iron rods, the cutter bar is prone to jamming. During the working process, due to the high-speed rotating cutter bar hitting an object, a reverse acting force will be generated on the cutter bar. When this acting force acts on the transmission structure between the cutter bar and the motor, it is easy to damage the transmission structure, and further, it is easy to cause damage to the motor. This greatly affects the service life of gardening tools and the maintenance cost is relatively high.

[0003] In the existing gardening tools, in order to avoid excessive noise during the gear transmission process, plastic gears are generally used to replace the commonly used metal gears. When the cutter bar encounters a hard obstacle, the impact force will cause the transmission components to deform, resulting in phenomena such as gear skipping and gear fragmentation of the plastic gears. Moreover, replacing the transmission components or plastic gears requires professional personnel to handle, and ordinary operators cannot replace them by themselves, so the maintenance cost is relatively high.

[0004] Currently, the gardening tools in the existing technology adopt a method of driving the cutter bar by relying on static friction. When the impact force is greater than the static friction, the cutter bar rotates relatively to avoid damage to the motor. However, the cutter bar fixing structure using this method is relatively complex and the cost is relatively high. Moreover, the static friction is easily affected by the personnel assembly and the usage condition of the gardening tool, and the change is relatively large, which is not conducive to protecting the transmission components and plastic gears.

[0005] In view of this, it is necessary to provide a gardening tool to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a gardening tool with an impact protection function.

[0007] To achieve the above purpose, the present invention provides a gardening tool, including a power component, a transmission component and a working component. The working component includes a cutter bar, a fixing seat and a fixing pin for connecting the cutter bar and the transmission component. Define the force when the fixing pin breaks as F. When the force borne by the fixing pin is less than F, the gardening tool works normally. When the force borne by the fixing pin is greater than F, the fixing pin breaks and the gardening tool stops working. Among them, define the load force borne by the transmission component during normal operation as F1, and the maximum load force that the transmission component can bear as F2, then F1 / N < F < F2 / N, where N is the number of fixing pins installed on one fixing seat.

[0008] As a further improvement of the present invention, the force applied to the fixing pin when it breaks is 8-10 times of F1 / N.

[0009] As a further improvement of the present invention, the fixing pin is any one of a cylinder, a hollow cylinder or a rolled steel.

[0010] As a further improvement of the present invention, the knife strip is provided with an assembly hole and at least one first through hole located around the assembly hole, the fixing seat is provided with a second through hole corresponding to the first through hole, and the fixing pin passes through the first through hole and the second through hole to fix the knife strip to the fixing seat.

[0011] As a further improvement of the present invention, the side of the fixing seat facing the knife strip is defined as the first side, and the side away from the knife strip is defined as the second side, the aperture of the second through hole on the first side is larger than the aperture of the through hole on the second side, and the outer diameter of the fixing pin is larger than the aperture of the second through hole on the second side.

[0012] As a further improvement of the present invention, the second through hole on the second surface is in a semi-through hole shape.

[0013] As a further improvement of the present invention, a step portion is provided on one side of the second surface of the fixing seat, and the step portion extends to partially cover the second through hole, so that the second through hole is in a semi-through hole shape on the second surface.

[0014] As a further improvement of the present invention, the height of the fixing pin is greater than the depth of the second through hole, and the portion of the fixing pin that is higher than the second through hole correspondingly extends into the first through hole of the blade.

[0015] As a further improvement of the present invention, two blades are provided, and two fixing seats are correspondingly provided. A fixing hole is provided at the center of each fixing seat, and the fixing holes on the two fixing seats have different shapes.

[0016] As a further improvement of the present invention, the transmission assembly includes two blade connecting shafts, and the shapes of the ends of the two blade connecting shafts are different so as to correspond one-to-one with the fixing holes on the two fixing seats, so that the blade connecting shafts are fixedly connected to the fixing seats through the fixing holes.

[0017] The beneficial effects of the present invention are as follows: For the gardening tool of the present invention, the knife bar is fixedly connected to the transmission component by using a fixing pin and a fixing seat. When the impact force received by the knife bar is less than the force F at which the fixing pin breaks, the gardening tool works normally; when the impact force received by the knife bar is greater than the force F at which the fixing pin breaks, the fixing pin will break, and the knife bar will automatically disconnect from the fixing seat, and then the knife bar will automatically disconnect from the transmission component, and the gardening tool will stop working, thereby avoiding damage to the transmission component caused by the impact force. In addition, by using the fixing pin structure, the replacement is simple and the maintenance cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a perspective view of a lawn mower, which is a preferred embodiment of the gardening tool of the present invention.

[0019] Figure 2 is Figure 1 a perspective view of some components.

[0020] Figure 3 is Figure 2 an exploded view of some components.

[0021] Figure 4 is Figure 2 another exploded view of some components.

[0022] Figure 5 is Figure 4 an enlarged view of a circled part in FIG.

[0023] Figure 6 is Figure 4 an enlarged view of another circled part.

[0024] Figure 7 is Figure 6 a perspective view of the fixing seat in FIG.

[0025] Figure 8 is Figure 6 a top view of the fixing seat in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in detail below with reference to the drawings and specific embodiments.

[0027] Here, it should be noted that in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution of the present invention are shown in the drawings, while other details less related to the present invention are omitted.

[0028] In addition, it should be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or apparatus.

[0029] Please refer to Figure 1 As shown, a gardening tool 100 provided by the present invention is preferably a lawn mower 100. The lawn mower 100 includes a housing 1, a control handle assembly 2 detachably connected to the housing 1, a power assembly 3 detachably connected to or inside the housing 1, a transmission rod assembly 4 housed inside the housing 1, a working assembly 5 detachably connected to the bottom of the housing, and a traveling wheel 6 for supporting the lawn mower 100 to rotate relative to the ground.

[0030] Furthermore, the power assembly 3 includes a main blade motor 31 for driving the transmission assembly 4 to rotate, a self-propelled motor for controlling the movement of the lawn mower, and a power source for supplying power to the main blade motor 31 and the self-propelled motor. The power source can be an AC power source or a DC power source, such as a battery pack. Further, the main blade motor 31 and the self-propelled motor can also be powered by an internal combustion engine or other prime movers that provide power. The main blade motor 31 is controlled by a control unit to output different speeds to provide different cutting speeds for the lawn mower 100.

[0031] Furthermore, the control handle assembly 2 is located at the rear of the housing 1 and is preferably of a U-shaped structure. It includes a first handle 21 and a second handle 22 extending backward and upward along the rear of the housing 1, and a connecting rod 23 connecting the first handle 21 and the second handle 22. The connecting rod 23 is located at the top of the control handle assembly 2, facilitating the operator's grip and operation. The first handle 21, the second handle 22, and the connecting rod 23 can be integrally formed or assembled and connected as long as it is convenient to operate the lawn mower 100, and there is no limitation in this regard.

[0032] Furthermore, a switch box 24 is provided at a position where the first handle 21 is close to the connecting rod 23. A start button 25 is provided on the switch box 24. The start button 25 is electrically connected to the main blade motor 31 in the power assembly 3 for starting the main blade motor 31. A switch pull rod 26 is provided at a position close to the connecting rod 23. The switch pull rod 26 is located above the switch box 24 and is electrically connected to the main blade motor 31 in the power assembly 3 for cooperating with the start button 25 on the switch box 24 to start the main blade motor 31.

[0033] Specifically, when starting the cutter bar of the lawn mower 100, first press the start button 25 on the switch box 24, and then pull the switch lever 26 to make the switch lever 26 close to and fit with the connecting rod 23 to start the main cutter motor 31, so that the main cutter motor 31 rotates to drive the cutter bar 41 to rotate for cutting work. When the cutting work is completed, release the switch lever 26, and the main cutter motor 31 stops rotating and the cutter bar 41 stops working. By setting the double actions of the start button 25 and the switch lever 26 to control the rotation of the main cutter motor 31, accidental touching of the start button 25 and mis-starting are prevented, and the safety factor of the lawn mower 100 is improved.

[0034] A self-propelled pull rod 27 is provided at a position where the control handle assembly 2 is close to the connecting rod 23. The self-propelled pull rod 27 is electrically connected to the self-propelled motor in the power assembly 3 and is used to start and stop the self-propelled motor to drive the running wheels 6 of the lawn mower 100 to rotate relative to the ground. Further, a plurality of running wheels 6 are provided below the housing 1, and at least one of the running wheels 6 is connected to the self-propelled motor. Specifically, when the self-propelled pull rod 27 is pulled so that the self-propelled pull rod 27 fits with the connecting rod 23, the self-propelled motor is started to drive the running wheels 6 to rotate. When the self-propelled pull rod 27 is released, the self-propelled pull rod 27 returns to its initial position to turn off the self-propelled motor.

[0035] Please refer to Figures 2 - 4 As shown, the power assembly 3 transmits power to the working assembly 5 through the transmission assembly 4 so that the lawn mower 100 can work properly. The transmission assembly 4 includes gears and two cutter bar connecting shafts 46. In a preferred embodiment of the present invention, the transmission assembly 4 is housed in the gear box 41. The gear box 41 includes a cover plate 411 and a bottom shell 412 having a receiving space. Among them, an opening 413 is provided on the cover plate 411 for the motor shaft of the main cutter motor 31 to extend into the receiving space of the bottom shell 412 of the gear box 41 through the opening 413 and be connected to the gear. Specifically, a bracket 311 corresponding to the opening 413 is provided at the lower end of the main cutter motor 31. Most of the main cutter motor 31 is located outside the gear box 41, and the motor shaft of the main cutter motor 31 passes through the bracket 311 and is connected to the gear in the gear box 41. A receiving space is formed in the bottom shell 412 of the gear box to house the gear in the gear box 41. Two protruding portions 414 protruding downward are further provided at the lower part of the bottom shell 412, and through holes for the cutter bar connecting shafts 46 to pass through are provided at the bottoms of the protruding portions 414.

[0036] Further, the gear includes a first gear 42 connected to the main cutting motor 31, a second gear 43 and a third gear 44 meshing with the first gear 42, i.e., the second gear 43 and the third gear 44 are respectively located on opposite sides of the first gear 42, and a fourth gear 45 away from the first gear 42 and meshing with the third gear 44. The first gear 42, the second gear 43, the third gear 44, and the fourth gear 45 are all housed in the bottom case 412 of the gearbox 41, and the four gears are horizontally placed so that the four gears rotate in the same plane. Specifically, the first gear 42 rotates synchronously driven by the main cutting motor 31, the second gear 43 and the third gear 44 also rotate synchronously driven by the first gear 42, and the fourth gear 45 also rotates synchronously driven by the third gear 44. However, the rotation directions of the second gear 43 and the fourth gear 45 are opposite. That is, when the first gear 42 rotates clockwise, the second gear 43 and the third gear 44 rotate counterclockwise, while the fourth gear 45 rotates clockwise.

[0037] Further, the second gear 43 is connected to the first cutter bar 511 through the first cutter bar connecting shaft 461 passing through the first protrusion 4141, and the fourth gear 45 is connected to the second cutter bar 512 through the second cutter bar connecting shaft 462 passing through the second protrusion 4142. The first cutter bar 511 and the second cutter bar 512 rotate in the same plane. Since the rotation directions of the second gear 43 and the fourth gear 45 are opposite, it avoids the collision between the first cutter bar 511 and the second cutter bar 512 during operation, improving the working safety of the lawn mower 100.

[0038] Please refer to Figures 4 - 7 As shown, the working component 5 includes a cutter bar 51, a fixed seat 52, and a fixing pin 53. The cutter bar 51 is fixedly connected to the transmission component 4 through the fixing pin 53 and the fixed seat 52. Specifically, the cutter bar 51 is fixed to the fixed seat 52 through the fixing pin 53, and then connected to the cutter bar connecting shaft 46 of the transmission component 4 through the fixed seat 52, so that the transmission component 4 can transmit power to the working component 5, enabling the lawn mower 100 to perform mowing work.

[0039] Specifically, an assembly hole 513 is provided at the center of the cutter bar 51, and at least one first through hole 514 is provided around the assembly hole 513. At the corresponding position of the fixed seat 52, a second through hole 523 corresponding to the first through hole 514 is provided, and the fixing pin 53 passes through the first through hole 514 of the cutter bar 51 and is fixed in the second through hole 523 of the fixed seat 52. Further, the height of the fixing pin 53 is greater than the depth of the second through hole 523, and the part of the fixing pin 53 protruding above the second through hole 523 correspondingly extends into the first through hole 514 on the cutter bar 51 to achieve the purpose of fixing the cutter bar 51 to the fixed seat 52 using the fixing pin 53.

[0040] Furthermore, the side of the fixing seat 52 facing the blade 51 is the first surface 524, and the side facing away from the blade 51 is the second surface 525. The through hole diameter of the second through hole 523 on the first surface 524 is larger than the through hole diameter on the second surface 525; and the outer diameter of the fixing pin 53 is larger than the through hole diameter of the second through hole 523 on the second surface 525. This arrangement can prevent the fixing pin 53 from being mis-installed during installation, and the fixing pin 53 must be fixed in the second through hole 523 in a specific direction, that is, in the second through hole 523, the installation direction of the fixing pin 53 is from the first surface 524 to the second surface 525.

[0041] Furthermore, the second through hole 523 is a semi-through hole. Specifically, a step portion 526 is turned out on the second surface 525 of the second through hole 523 using a tool, and the step portion 526 extends to partially cover the second through hole 523, so that the second through hole 523 is a semi-through hole on the second surface 525. The purpose of such a setting, on the one hand, can play a limiting role, fix the fixing pin 53 in the second through hole 523, and ensure that the fixing pin 53 is accurately installed to avoid misinstallation. On the other hand, the setting of the semi-through hole facilitates the removal of the fixing pin 53. When the fixing pin 53 is to be removed, it is only necessary to insert a needle-like object into the semi-through hole to push the fixing pin 53 out, which is very simple and convenient.

[0042] Further, the garden tool 100 includes two sets of the above-mentioned working components 5, each set of working components includes a blade 51, a fixing seat 52 and a fixing pin 53. Each blade 51 is provided with an assembly hole 513 at the center and at least one first through hole 514 is provided around the assembly hole 513, each fixing seat 52 is provided with a second through hole 523 corresponding to the first through hole 514, and the fixing pin 53 passes through the first through hole 514 and the second through hole 523 to fix the blade 51 on the fixing seat 52. Specifically, the first blade 511 is fixed to the first fixing seat 521 by the fixing pin 53, and the second blade 512 is fixed to the second fixing seat 522 by the fixing pin 53.

[0043] Furthermore, each fixing seat 52 is provided with a boss (not numbered) at the center of the first surface 524, and a protrusion 527 is provided at the corresponding position of the second surface 525. A fixing hole 528 is provided at the center of the boss and the protrusion 527, and the fixing hole 528 passes through the protrusion 527 and the boss. The outer parts of the two fixing holes 528 at the boss are both circular, and the circle matches the assembly hole 513 of the blade 51. Through this arrangement, the blade 51 can only rotate around the blade connecting shaft 46, and then the blade 51 is fixed to the fixing seat 52 by the fixing pin 53, which limits the freedom of the blade 51. When the fixing pin 53 is broken, the blade 51 can rotate relative to the fixing seat 52.

[0044] Further, the two fixing holes 528 are also circular on the outside of the protrusion 527 on the second surface 525 of the fixing base 52, but the cross-sectional shapes of the inner holes of the two fixing holes 528 are different, making the two fixing bases 52 inconsistent. Correspondingly, the transmission assembly 4 includes two blade connecting shafts 46, and the shapes of the ends of the two blade connecting shafts 46 are different and correspond to the cross-sections of the inner holes of the fixing holes 528 on the two fixing bases 52 one by one, so that each blade connecting shaft 46 is fixedly connected to the corresponding fixing base 52 through the corresponding fixing hole 528 to prevent the two fixing bases 52 from being used interchangeably.

[0045] Specifically, in a preferred embodiment of the present invention, the cross-section of the inner hole of the first fixing hole 5281 on the first fixing base 521 in the horizontal direction is long-waisted, and the cross-section of the inner hole of the second fixing hole 5282 on the second fixing base 522 in the horizontal direction is G-shaped. Correspondingly, the cross-section of the end 4641 of the first blade connecting shaft 461 in the horizontal direction is long-waisted, and the cross-section of the end 4642 of the second blade connecting shaft 462 in the horizontal direction is C-shaped, so that the first blade connecting shaft 461 corresponds to and matches the first fixing hole 5281 of the first fixing base 521, and the second blade connecting shaft 462 corresponds to and matches the second fixing hole 5282 of the second fixing base 522. Each blade connecting shaft 46 passes through the corresponding fixing hole 528 and is connected to the corresponding fixing base 52, and each blade 51 is connected to the corresponding blade connecting shaft 46 through the fixing base 52 to prevent the two fixing bases 52 from being used interchangeably, and at the same time keep the two blades 51 at a fixed angle to avoid the two blades 51 affecting each other during work.

[0046] Further, a limiting portion 463 is provided at a position near the end of each blade connecting shaft 46 to limit the fixing base 52 at the lower end of the blade connecting shaft 46, prevent the fixing base 52 from moving freely on the blade connecting shaft 46, and further prevent the blade 51 from moving freely on the blade connecting shaft 46, thereby improving work efficiency.

[0047] Further, the working component 5 further includes a fixing component 54, and the fixing component 54 fixedly connects the cutter bar 51 to the cutter bar connecting shaft 46. Specifically, the fixing component 54 includes a gasket 541 and a fixing member 542. The gasket 541 is provided with a mounting hole, and the gasket 541 is assembled under the cutter bar 51. The cutter bar 51 is clamped on the fixing seat 52 by the fixing seat 52 and the gasket 541, and then through the fixing member 542, the gasket 541, the cutter bar 51, and the fixing seat 52 are tightened on the cutter bar connecting shaft 46. In fact, in a preferred embodiment of the present invention, the fixing member 542 is a nut provided with internal threads, and the end 464 of the cutter bar connecting shaft 46 is provided with corresponding external threads. The cutter bar connecting shaft 46 sequentially passes through the fixing hole 528 of the fixing seat 52, the assembly hole 513 of the cutter bar 51, and the mounting hole of the gasket 541 and meshes with the fixing member 542. The working component 5 is fixedly installed on the transmission component 4 through the fixing component 54, so that the working component 5 works as the transmission component 4 rotates.

[0048] Specifically, when the lawn mower 100 works, the main cutter motor 31 drives the first gear 42 to rotate synchronously, the first gear 42 drives the second gear 43 and the third gear 44 to rotate synchronously, the second gear 43 drives the first cutter bar 511 to work through the first cutter bar connecting shaft 461, the third gear 44 drives the fourth gear 45 to rotate, and the fourth gear 45 drives the second cutter bar 512 to work through the second cutter bar connecting shaft 462.

[0049] For the lawn mower 100, in order to avoid excessive noise during the gear transmission process, plastic gears are generally used to replace the commonly used metal gears. When the first cutter bar 511 and the second cutter bar 512 encounter hard obstacles, the impact force will, on the one hand, cause the deformation of the first cutter bar connecting shaft 461 and the second cutter bar connecting shaft 462, and on the other hand, be transmitted to the second gear 43 and the fourth gear 45 respectively through the first cutter bar connecting shaft 461 and the second cutter bar connecting shaft 462, and then transmitted to the first gear 42, resulting in the phenomenon of gear skipping and gear fragmentation of the plastic gears.

[0050] Define the force when the fixing pin 53 breaks as F. When the force borne by the fixing pin 53 is less than F, the fixing pin 53 fixes the cutter bar 51 on the fixing seat 52. Further, the cutter bar 51 is fixedly connected to the transmission component 4 through the fixing pin 53 and the fixing seat 52, and the gardening tool 100 works normally. When the force borne by the fixing pin 53 is greater than F, the fixing pin 53 breaks, the cutter bar 51 is automatically disconnected from the fixing seat 52, and further the cutter bar 51 is unloaded from the transmission component 4, and the gardening tool 100 stops working. Wherein, define the load force borne by the transmission component 4 during normal operation as F1, and the maximum load force that the transmission component 4 can bear as F2, then F1 / N < F < F2 / N, where N is the number of fixing pins 53 installed on one fixing seat 52.

[0051] Specifically, when the lawn mower 100 is working properly, the load force on the transmission component is F1. Since the force F when the fixing pin 53 breaks is greater than F1 / N (N is the number of fixing pins 53 installed on one fixing seat 52), the fixing pin 53 will not break and still fixedly connects the cutter bar 51 to the fixing seat 52. Thus, the cutter bar 51 is fixedly connected to the cutter bar connecting shaft 46 through the fixing seat 52. As the gear rotates, it drives the cutter bar connecting shaft 46 to rotate, thereby driving the cutter bar 51 to rotate for mowing work. When the lawn mower 100 encounters a hard obstacle and the impact force is greater than or equal to the load force F2 when the plastic gear breaks, since the force F when the fixing pin 53 breaks is less than F2 / N (N is the number of fixing pins 53 installed on one fixing seat 52), the fixing pin 53 will break, and the cutter bar 51 will automatically disconnect from the fixing seat 52. Furthermore, the cutter bar 51 will be unloaded from the transmission component 4, and the gardening tool 100 will stop working, thus avoiding damage to the transmission component 4 by the impact force and enabling the gardening tool 100 to have an impact protection function.

[0052] Preferably, the fixing pin 53 is any one of a cylinder, a hollow cylinder, or a coil steel. Further, the force F when the fixing pin 53 breaks is preferably 8 - 10 times of F1 / N, where N is the number of fixing pins 53 installed on one fixing seat 52. When the lawn mower 100 is working, when the cutter bar 51 hits a small obstacle, since the impact force received is less than the force F when the fixing pin 53 breaks and is also less than the load force F2 when the plastic gear breaks, the cutter bar 51 will knock the small obstacle away. At this time, the fixing pin 53 will not break and the plastic gear will not break either, and the lawn mower 100 still works properly. When the cutter bar 51 hits a large obstacle, since the impact force received is greater than the force F when the fixing pin 53 breaks, at this time, the fixing pin 53 will break, and the cutter bar 51 will automatically disconnect from the fixing seat 52. Furthermore, the cutter bar 51 will be unloaded from the transmission component 4, and the gardening tool 100 will stop working, thus avoiding damage to the cutter bar connecting shaft 46 and the plastic gear by the impact force and enabling the gardening tool 100 to have an impact protection function.

[0053] Further, when the fixing pin 53 breaks inside the fixing seat 52, since a step portion 526 is provided on one side of the second surface 525 of the fixing seat 52, and the step portion 526 extends to partially cover the second through hole 523, so that the second through hole 523 is in a semi-through hole shape on the second surface 525, that is, the second through hole 523 for fixing the fixing pin 53 is a semi-through hole. The operator can use a tool to knock the broken fixing pin 53 out from the second surface 525 of the fixing seat 52, and only need to replace the fixing pin 53 to make the lawn mower 100 continue to work. Compared with replacing the gear or the cutter bar connecting shaft 46, using the structure of the fixing pin 53 is not only simple to replace but also reduces the maintenance cost.

[0054] In summary, for the gardening tool 100 of the present invention, the cutter bar 51 is fixedly connected to the transmission assembly 4 by using the fixing pin 53 and the fixing seat 52. When the impact force received by the cutter bar 51 is less than the force F at which the fixing pin 53 breaks, the gardening tool 100 works normally; when the impact force received by the cutter bar 51 is greater than the force F at which the fixing pin 53 breaks, the fixing pin 53 will break, the cutter bar 51 and the fixing seat 52 are automatically disconnected, and further the cutter bar 51 and the transmission assembly 4 are automatically disconnected, and the gardening tool 100 stops working, thereby avoiding damage to the transmission assembly 4 caused by the impact force. In addition, by using the fixing pin 53 structure, the replacement is simple and the maintenance cost is low.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A gardening tool, comprising a power component, a transmission component and a working component, characterized in that: The working assembly comprises a knife bar and a fixing seat and a fixing pin for connecting the knife bar to the transmission assembly; the transmission assembly comprises a knife bar connecting shaft, the knife bar is connected to the knife bar connecting shaft through the fixing seat, and the working assembly further comprises a fixing assembly for fixing the knife bar to the knife bar connecting shaft; the knife bar is provided with an assembly hole at the center and at least one first through hole around the assembly hole, the fixing seat is provided with a second through hole corresponding to the first through hole, for the fixing pin to pass through the first through hole and be fixed on the second through hole, the height of the fixing pin is greater than the depth of the second through hole, and the fixing pin passes through the second through hole and the part higher than the second through hole extends into the first through hole correspondingly, so as to fix the knife bar to the fixing seat; The side of the fixing seat facing the knife strip is defined as the first side, and the side away from the knife strip is defined as the second side, the through hole diameter of the second through hole on the first side is larger than the through hole diameter on the second side, and the outer diameter of the fixing pin is larger than the through hole diameter of the second through hole on the second side, the second through hole is in the shape of a semi-through hole on the second side, a step portion is provided on one side of the second side of the fixing seat, the step portion extends to partially cover the second through hole, so that the second through hole is in the shape of a semi-through hole on the second side; the fixing seat is provided with a boss at the center of the first side thereof, and a protrusion is provided at a corresponding position of the second side, a penetrating fixing hole is provided at the center of the boss and the protrusion, and the fixing hole is circular outside the boss to match the assembly hole; The force when the fixing pin breaks is defined as F. When the force borne by the fixing pin is less than F, the garden tool works normally. When the force borne by the fixing pin is greater than F, the fixing pin breaks and the garden tool stops working. The load force borne by the transmission assembly when working normally is defined as F1, and the maximum load force that the transmission assembly can withstand is F2. Then, F1 / N<F<F2 / N, wherein N is the number of fixing pins installed on a fixing seat.

2. The gardening tool according to claim 1, wherein: The force F exerted on the fixing pin when it breaks is 8-10 times of F1 / N.

3. The gardening tool according to claim 1, wherein: The fixing pin is any one of a cylinder, a hollow cylinder or a rolled steel.

4. The gardening tool according to claim 1, wherein: The blade strips are provided with two, and the fixing seats are correspondingly provided with two. A fixing hole is provided at the center of each fixing seat, and the fixing holes on the two fixing seats have different shapes.

5. The gardening tool according to claim 4, wherein: The transmission assembly includes two blade connecting shafts, and the shapes of the ends of the two blade connecting shafts are different so as to correspond one-to-one with the fixing holes on the two fixing seats, so that the blade connecting shafts are fixedly connected to the fixing seats through the fixing holes.

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