A hand-held electric garden shears

Abstract

This invention relates to a handheld electric garden shears, comprising a first gear and a second gear meshing with each other. The eccentric position of the first gear is hinged to one end of a first connecting rod, and the eccentric position of the second gear is hinged to one end of a third connecting rod. The outer ends of the second and fourth connecting rods are provided with a first pin. The other end of the first connecting rod and the end of the first blade away from the cutting edge are rotatably connected to the first pin. The middle parts of the second and fourth connecting rods and the end of the first blade near the cutting edge are hinged to the second pin. The second pin is connected to a housing. A third pin is provided between the inner ends of the second and fourth connecting rods. The third pin is hinged to the end of the second blade near the cutting edge, and the end of the second blade away from the cutting edge is hinged to the other end of the third connecting rod. The first or second gear is connected to a rotation drive mechanism. The garden shears of this invention reduce the risk of the blade getting stuck in the branch cut and improve pruning efficiency.

Description

Technical Field

[0001] This invention relates to the field of garden shears technology, specifically to a handheld electric garden shears. Background Technology

[0002] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art.

[0003] Handheld electric garden shears are commonly used tree pruning tools for fruit trees, ornamental trees, and landscaping, with a wide range of applications. Current handheld electric garden shears mainly consist of a high-speed DC motor, a high-ratio reduction mechanism, a shearing head, a control board, and a battery pack. The shearing head consists of two blades directly mounted on the housing; the fixed blade is rigidly connected to the housing, while the moving blade is hinged to the housing. During branch pruning, the contact line between the moving blade and the branch continuously increases, resulting in greater shearing force. When pruning thicker or harder branches, the blade often gets stuck at the branch cut. In this case, the operator needs to release the shear switch, rotate the shears around the branch at a certain angle, and continue cutting. For particularly thick and hard branches, it may require several rotations to cut them, severely impacting tree pruning efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a handheld electric garden shears that reduces the risk of blades getting stuck at branch cuts and improves pruning efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: An embodiment of the present invention provides a handheld electric garden shears, including a first gear and a second gear that mesh with each other. The eccentric position of the first gear is hinged to one end of a first connecting rod, and the eccentric position of the second gear is hinged to one end of a third connecting rod. A first pin is provided between the outer ends of the second and fourth connecting rods. The other end of the first connecting rod and the end of the first blade away from the cutting edge are rotatably connected to the first pin. The middle parts of the second and fourth connecting rods and the end of the first blade near the cutting edge are hinged to the second pin. The second pin is connected to a housing. A third pin is provided between the inner ends of the second and fourth connecting rods. The third pin is hinged to the end of the second blade near the cutting edge, and the end of the second blade away from the cutting edge is hinged to the other end of the third connecting rod. The first gear or the second gear is connected to a rotation drive mechanism.

[0006] Optionally, the first gear and the second gear are rotatably connected to the housing.

[0007] Optionally, the rotation drive mechanism includes a transmission component. When the first gear is connected to the rotation drive mechanism, the transmission component is connected to the first gear. When the second gear is connected to the rotation drive mechanism, the transmission component is connected to the second gear. The transmission component is connected to the power component, which is installed inside the housing. The housing is fixed to the box.

[0008] Optionally, the transmission component adopts a bevel gear transmission mechanism, and the power component adopts a motor installed in the housing, with the output shaft of the motor connected to the input end of the bevel gear transmission mechanism.

[0009] Optionally, the housing may also include a battery pack, which is connected to the power assembly to supply power to the power assembly.

[0010] Optionally, a bushing is provided between the end of the first connecting rod and the end of the first blade facing away from the cutting edge and the first pin.

[0011] Optionally, a bushing is provided between the second pin and the second connecting rod, the fourth connecting rod, and the end of the first blade near the cutting edge.

[0012] Optionally, a bushing is provided between the third pin and the end of the second blade near the cutting edge.

[0013] Optionally, a gasket is provided between the first link and the second link and the first blade, and a gasket is provided between the end of the second blade and the third link.

[0014] Optionally, both the first gear and the second gear include a gear portion, the gear portion being coaxially connected to a journal, and the gear portions of the first gear and the second gear meshing with each other; The eccentric portion of the journal of the first gear is provided with a first U-shaped notch, and the end of the first connecting rod extends into the first U-shaped notch and is hinged to the eccentric portion of the journal of the first gear. The eccentric portion of the journal of the second gear is provided with a second U-shaped notch, and the end of the third connecting rod extends into the second U-shaped notch and is hinged to the eccentric portion of the journal of the second gear.

[0015] The beneficial effects of this invention are as follows: The handheld electric garden shears of this invention have a third pin between the inner ends of the second and fourth connecting rods. The third pin is hinged to the bottom end of the second blade near the cutting edge. When the first and second gears rotate in opposite directions, the first gear drives the first blade to rotate around the second pin through the first and second connecting rods. The second gear drives the second blade to rotate around the third pin through the third connecting rod, and the rotation direction is opposite to that of the first blade. Therefore, it can cut branches. When the second blade rotates, since the third pin moves with the second and fourth connecting rods, the first and second blades perform a closing motion, which reduces the blade size. At the same time, the cutting edges of the first and second blades can also produce a relatively obvious misalignment motion, which can prevent the first and second blades from being stuck by the branch cut and is beneficial for pruning thicker and harder branches. Attached Figure Description

[0016] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the internal structure of the shell and box in Embodiment 1 of the present invention; Figure 3 This is the present invention. Figure 2 A schematic diagram of the section along direction A; Figure 4 This is the present invention. Figure 2 Schematic diagram of section B in the middle; Figure 5 This is the present invention. Figure 2 Schematic diagram of the C-direction section; Among them, 1. housing, 2. battery pack, 3. power assembly, 4. blade motion drive mechanism, and 5. trimming mechanism; 401. Second bevel gear, 402. First bevel gear, 403. First gear, 404. Bearing, 405. Fifth pin, 406. First connecting rod, 407. First pin, 408. Second connecting rod, 409. Second gear, 410. Sixth pin, 411. Third connecting rod, 412. Fourth pin, 413. Third pin, 414. Second pin, 415. First housing cover, 416. Second housing cover, 417. Sixth bushing, 418. Second bushing, 419. Gasket, 420. Fourth bushing, 421. Third bushing, 422. Fourth connecting rod, 423. Fifth bushing; 501. First blade, 502. Second blade. Detailed Implementation

[0018] In this embodiment, the bottom ends of the first blade and the second blade refer to the ends of the first blade and the second blade that are closer to the operator.

[0019] Example 1 This embodiment provides a handheld electric garden shears, such as Figures 1-5 As shown, the device includes a housing 1, with a box fixed inside one end. A blade movement drive mechanism 4 is housed inside the box, connected to a pruning mechanism 5. The pruning mechanism 5 includes a first blade 501 and a second blade 502. The blade movement drive mechanism 4 can drive the first blade 501 and the second blade 502 to open and close simultaneously, while also allowing them to move in opposite directions to prevent them from getting stuck by the cut of the branch. A power assembly 3 is located inside the housing, connected to the blade movement drive mechanism 4. The power assembly 3 provides power to the blade movement drive mechanism 4, causing it to move. A battery pack 2 is also located inside the housing 1, supplying power to the power assembly 3.

[0020] The housing 1 has a wave-shaped structure at the designated position, which allows the operator to hold the device comfortably.

[0021] The blade motion drive mechanism 4 includes a first gear 403, a second gear 409, a first connecting rod 406, a second connecting rod 408, a third connecting rod 411, a fourth connecting rod 422, and a transmission assembly. The first gear 403 meshes with the second gear 409. The first gear 403 is connected to the power assembly 3 through the transmission assembly. The power assembly 3 can drive the first gear 403 to rotate through the transmission assembly. Under the meshing action of the first gear 403 and the second gear 409, the first gear 403 and the second gear 409 rotate in opposite directions.

[0022] In this embodiment, both the first gear and the second gear 403 and 409 include a gear portion and a journal. The gear portion is coaxially disposed at one end of the journal. The gear portions of the first gear 403 and the second gear 409 adopt a spur gear structure and mesh with each other.

[0023] The first gear 403 and the second gear 409 are both coaxially fixed on the gear shaft. The two ends of the gear shaft are rotatably connected to the housing through bearings 404, so that the first gear 403 and the second gear 409 can rotate around their own axis.

[0024] A first pin 407 is provided between the outer ends of the second link 408 and the fourth link 422. Specifically, one end of the first pin 407 is provided with a limiting block, which is embedded in the limiting groove provided at the end of the second link 408 to prevent relative rotation between the first pin 407 and the second link 408. The other end of the first pin 407 is fixedly connected to the outer end of the fourth link 422 by a screw, thereby realizing the fixation of the first pin 407 between the outer ends of the second link 408 and the fourth link 422.

[0025] One end of the first connecting rod 406 and the bottom end of the first blade 501 away from the cutting edge are rotatably connected to the first pin 407. Preferably, a first bushing is provided between the bottom end of the first connecting rod 406 and the first blade 501 away from the cutting edge and the first pin. Gaskets are provided between the two sides of the first connecting rod 406 and the second connecting rod 408 and the first blade 501, respectively. A gasket is provided between the first blade 501 and the fourth connecting rod 422. The gaskets can reduce the friction force on the first connecting rod 406 and the first blade 501 when they move.

[0026] A second pin 414 passes through the middle of the second link 408 and the fourth link 422 and the end of the first blade 501 near the blade edge. The second pin 414 is connected to the housing. In this embodiment, the housing is assembled from the first cover 415 and the second cover 416. One end of the second pin 414 is connected to the first cover 415 and the other end is connected to the second cover 416.

[0027] Specifically, one end of the second pin 414 is provided with a limiting block, which is embedded in the limiting groove provided in the first box cover 415, and the other end of the second pin 414 is fixed to the second box cover 416 by screws.

[0028] Specifically, one end of the second pin 414 is provided with a limiting block, which is embedded in the limiting groove provided in the first box cover 415 to prevent relative rotation between the second pin 414 and the box body. The other end of the second pin 414 is fixedly connected to the second box cover 416 by screws.

[0029] The second connecting rod 408, the fourth connecting rod 422, and the bottom end of the first blade 501 near the cutting edge are rotatably connected to the second pin 414, and a second bushing 418 is provided between the second connecting rod 408, the fourth connecting rod 422, the first blade 501 and the second pin 414.

[0030] Furthermore, gaskets are provided on both sides of the middle position of the second connecting rod 408 between the first box cover 415 and the first blade 501, and gaskets are provided between the middle of the fourth connecting rod 422 and the first blade 501.

[0031] Since the first blade 501 is connected to the second link 408 and the fourth link 422 at two different locations, the first blade 501 cannot move relative to the second link 408 and the fourth link 422, which is equivalent to a fixed connection.

[0032] A third pin 413 is provided between the inner ends of the second link 408 and the fourth link 422. Specifically, one end of the third pin 413 is provided with a limiting block, which is embedded in the limiting groove provided at the end of the second link 408 to prevent relative rotation between the third pin 413 and the second link 408. The other end of the third pin 413 is fixedly connected to the inner end of the fourth link 422 by screws.

[0033] The bottom end of the second blade 502 near the cutting edge is rotatably connected to the third pin 413, and a third bushing 421 is provided between the bottom end of the second blade 502 near the cutting edge and the third pin 413. Gaskets are provided on both sides of the end of the second blade 502 near the cutting edge and between the inner ends of the second connecting rod 408 and the fourth connecting rod 422.

[0034] One end of the third link 411 is hinged to the bottom end of the second blade 502 away from the cutting edge. Specifically, the end of the third link 411 is provided with a U-shaped groove, and a fourth pin 412 is provided in the U-shaped groove. The bottom end of the second blade 502 away from the cutting edge is rotatably connected to the fourth pin 412 and a fourth bushing 420 is provided between the second and fourth pins.

[0035] The bottom end of the second blade 502, away from the cutting edge, is provided with gaskets 419 between the two sides of the end and the groove surface of the U-shaped groove to reduce friction.

[0036] The journal section of the first gear 403 has an eccentric part with a U-shaped notch. A fifth pin 405 is provided inside the U-shaped notch. A limiting block is provided at one end of the fifth pin 405, which is embedded in the limiting groove provided in the gear part of the first gear 403. The other end is fixedly connected to the eccentric part by a screw. The other end of the first connecting rod 406 is rotatably connected to the fifth pin 405 and a fifth bushing 423 is provided between the first connecting rod 406 and the fifth pin 405. Gaskets are provided between the two sides of the first connecting rod 406 and the sides of the U-shaped notch to reduce friction.

[0037] The journal section of the second gear 409 has an eccentric part with a U-shaped notch. A sixth pin 410 is provided inside the U-shaped notch. One end of the sixth pin 410 has a limiting block that is embedded in a limiting groove provided in the gear part of the second gear. The other end of the sixth pin is fixed to the eccentric part by a screw. The other end of the third connecting rod 411 is rotatably connected to the sixth pin 410 and a sixth bushing 417 is provided between the third connecting rod 411 and the side of the U-shaped notch to reduce friction. Gaskets 419 are provided between the two sides of the third connecting rod 411 and the sides of the U-shaped notch to reduce friction.

[0038] The transmission assembly adopts a bevel gear transmission mechanism, including a first bevel gear 402 and a second bevel gear 401 that mesh with each other. The second bevel gear 401 serves as the driving bevel gear and is connected to the power assembly. The first bevel gear 402 is connected to the journal section of the first gear 403 or to the journal section of the second gear 409. In this embodiment, the first bevel gear 402 is connected to the journal section of the first gear 403. Specifically, the gear portion of the first gear 403 is located on one side of the journal section of the first gear 403, and the first bevel gear 402 is fixed to the other side of the journal section by screws.

[0039] In this embodiment, the diameter of the first bevel gear 402 is larger than the diameter of the second bevel gear 401 to achieve power reduction transmission.

[0040] In this embodiment, the power component 3 is a motor, preferably a DC brushless motor. The output shaft of the DC brushless motor passes through the housing and is rigidly connected to the second bevel gear 401. A bearing is provided between the output shaft of the DC brushless motor and the housing so that the output shaft of the DC brushless motor is rotatably connected to the housing.

[0041] The end of the housing near the first blade 501 and the second blade 502 covers the outer periphery of the box and is fixedly connected to the box.

[0042] Battery pack 2 is connected to the brushless DC motor via a power supply circuit to supply power to the brushless DC motor. The power supply circuit is equipped with a switch mounted on the housing to facilitate the operator to control the power supply to and from the brushless DC motor.

[0043] The working method of the handheld electric garden shears in this embodiment is as follows: The operator holds the casing and uses the blades formed by the first blade 501 and the second blade 502, which are in their open state, to clamp the branch being pruned. The operator then activates a switch. The DC brushless motor drives the first gear 403 to rotate via the first bevel gear 402 and the second bevel gear 401. The first gear 403 and the second gear 409 mesh and rotate in opposite directions. The first gear 403, through the first connecting rod 406, pushes the second connecting rod 408, the fourth connecting rod 422, and the first blade 501 to rotate around the second pin 414. Simultaneously, under the action of the third connecting rod 411, the second blade 502 rotates around the third pin 413 in the opposite direction to the rotation direction of the first blade 501. The first blade 501 and the second blade 502 make a closed motion towards each other, and the blade edge gradually decreases, thus achieving the cutting of the branch. At the same time, since the third pin 413 moves with the first blade 501, there is also a significant misalignment motion between the first blade 501 and the second blade 502 while they are making a closed motion, which reduces the risk of the blade getting stuck at the branch cut.

[0044] The handheld electric garden shears of this application, while the first blade 501 and the second blade 502 are closing and the blade opening is reduced, the blades of the first blade 501 and the second blade 502 can also produce a relatively obvious misalignment movement, which can prevent the first blade 501 and the second blade 502 from being stuck by the cut of the branch, and is conducive to pruning thicker and harder branches.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A handheld electric garden shears, characterized in that, The system includes a first gear and a second gear that mesh with each other. The eccentric position of the first gear is hinged to one end of a first connecting rod, and the eccentric position of the second gear is hinged to one end of a third connecting rod. A first pin is provided between the outer ends of the second and fourth connecting rods. The other end of the first connecting rod and the end of the first blade away from the cutting edge are rotatably connected to the first pin. The middle parts of the second and fourth connecting rods and the end of the first blade near the cutting edge are hinged to the second pin. The second pin is connected to the housing. A third pin is provided between the inner ends of the second and fourth connecting rods. The third pin is hinged to the end of the second blade near the cutting edge, and the end of the second blade away from the cutting edge is hinged to the other end of the third connecting rod. The first gear or the second gear is connected to a rotation drive mechanism. The first gear pushes the second and fourth connecting rods and the first blade to rotate around the second pin through the first connecting rod. At the same time, under the action of the third connecting rod, the second blade rotates around the third pin in the opposite direction to the rotation direction of the first blade, and the third pin moves with the first blade. As the first and second blades move in a closing motion, the cutting edge shrinks, and the cutting edges of the first and second blades also move in a staggered motion.

2. The handheld electric garden shears as described in claim 1, characterized in that, The first gear and the second gear are rotatably connected to the housing.

3. The handheld electric garden shears as described in claim 1, characterized in that, The rotation drive mechanism includes a transmission component. When the first gear is connected to the rotation drive mechanism, the transmission component is connected to the first gear. When the second gear is connected to the rotation drive mechanism, the transmission component is connected to the second gear. The transmission component is connected to the power component, which is installed inside the housing. The housing is fixed to the box.

4. A handheld electric garden shears as described in claim 3, characterized in that, The transmission component adopts a bevel gear transmission mechanism, and the power component adopts a motor installed in the housing. The output shaft of the motor is connected to the input end of the bevel gear transmission mechanism.

5. A handheld electric garden shears as described in claim 3, characterized in that, The housing also contains a battery pack, which is connected to the power assembly to supply power to the power assembly.

6. A handheld electric garden shears as described in claim 1, characterized in that, A bushing is provided between the end of the first connecting rod and the end of the first blade that faces away from the cutting edge and the first pin.

7. A handheld electric garden shears as described in claim 1, characterized in that, A bushing is provided between the second pin and the second connecting rod, the fourth connecting rod, and the end of the first blade near the cutting edge.

8. A handheld electric garden shears as described in claim 1, characterized in that, A bushing is provided between the third pin and the bottom end of the second blade near the cutting edge.

9. A handheld electric garden shears as described in claim 1, characterized in that, A gasket is provided between the first link and the second link and the first blade, and a gasket is provided between the end of the second blade and the third link.

10. A handheld electric garden shears as described in claim 1, characterized in that, Both the first gear and the second gear include a gear section, and the gear section is coaxially connected to a journal shaft. The gear sections of the first gear and the second gear mesh with each other. The eccentric portion of the journal of the first gear is provided with a first U-shaped notch, and the end of the first connecting rod extends into the first U-shaped notch and is hinged to the eccentric portion of the journal of the first gear. The eccentric portion of the journal of the second gear is provided with a second U-shaped notch, and the end of the third connecting rod extends into the second U-shaped notch and is hinged to the eccentric portion of the journal of the second gear.

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