Hedge trimmer

Abstract

The utility model discloses a hedge trimmer which comprises a shell, two blades and a driving mechanism, and one end of each blade extends into the shell; the driving mechanism is fixed in the shell and comprises a power source, a rotary striking block, an output shaft and a reset piece which are connected in sequence, the power source is connected with the output shaft through the rotary striking block and drives at least one of the blades to reciprocate, and the reset piece is connected between the power source and the rotary striking block. One end of the output shaft protrudes in the radial direction of the output shaft to form a protruding block, the rotary striking block is provided with a check block protruding in the direction of the output shaft, and the check block abuts against and pushes the protruding block to rotate when rotating, so that the output shaft is driven to rotate. According to the hedge trimmer, the striking mechanism is arranged, so that when thick branches or other objects to be sheared are stuck, the branches can be cut off by repeated striking actions.

Description

Technical Field

[0001] This application belongs to the field of greening equipment technology, specifically relating to an improved hedge trimmer. Background Technology

[0002] A hedge trimmer is a machine specifically designed for trimming hedges, lawn edges, and other landscaping projects. It is suitable for trimming various types of hedges and lawn edges. During use, when encountering thicker or harder branches, it may become stuck and unable to cut, or the two cutting teeth may bite the branch and prevent it from being pulled out.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this application is to provide an improved hedge trimmer to solve the problem of difficulty in handling thicker and harder branches.

[0005] To achieve the above objectives, a specific embodiment of this application provides a hedge trimmer, including a housing, two blades, and a drive mechanism. One end of the two blades extends into the housing. The drive mechanism includes a power source, a rotary impact assembly, and an output shaft connected in sequence. The power source is connected to and drives the output shaft to rotate through the rotary impact assembly. The output shaft is connected to and drives at least one of the blades to reciprocate. When the blade is obstructed, the rotary impact assembly applies an impact force in the direction of rotation to the output shaft.

[0006] In one or more embodiments of this application, the rotating impact assembly includes a steel ball, and a planetary carrier, a reset member, and a rotating impact block connected in sequence. The rotating impact block has a circular hole along its own axial direction. The planetary carrier has a drive shaft protruding into the circular hole. The drive shaft has a V-groove on its side wall and a groove on the inner wall of the circular hole. The steel ball is disposed in the V-groove and the groove.

[0007] In one or more embodiments of this application, the drive shaft is provided with two V-grooves, and the inner wall of the circular hole is provided with two grooves, and the two grooves are located on the same diameter of the circular hole.

[0008] In one or more embodiments of this application, the reset element is sleeved on the drive shaft and disposed between the planet carrier and the rotating impact block.

[0009] In one or more embodiments of this application, the rotating impact assembly further includes a plurality of gears fixed inside the planetary carrier, and an internal gear ring sleeved outside the planetary carrier and meshing with the gears, the internal gear ring being fixedly connected to the housing.

[0010] In one or more embodiments of this application, the power source is linked to and drives the planetary carrier to rotate, one end of the output shaft has a protrusion extending radially therefrom, and the rotating impact block is provided with a stop block extending toward the output shaft. When the stop block rotates, it abuts against and pushes the protrusion and the output shaft to rotate.

[0011] In one or more embodiments of this application, two protrusions are symmetrically arranged on the output shaft, and two stops are arranged on the rotating impact block.

[0012] In one or more embodiments of this application, the drive mechanism drives the two blades to reciprocate in opposite directions.

[0013] In one or more embodiments of this application, the driving mechanism includes an eccentric circular driving block and two driving sleeves. The eccentric circular driving block includes two eccentrically arranged cylinders, one of which has a socket for the output shaft to be inserted. Each blade has a cylindrical driving post protruding from it. One end of each of the two driving sleeves has a first circular hole that is respectively fitted onto the two cylinders, and the other end has a second circular hole that is respectively fitted onto the two driving posts.

[0014] In one or more embodiments of this application, the socket is a cross-shaped socket, and the end of the output shaft includes a cross-shaped insertion portion that matches the cross-shaped socket.

[0015] Compared with the prior art, the hedge trimmer of this application, by setting up a striking mechanism, can cut branches by repeatedly striking them when it gets stuck on thicker branches or other objects to be cut. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a hedge generator according to one embodiment of this application;

[0018] Figure 2 This is an anatomical diagram of a hedge trimmer according to one embodiment of this application;

[0019] Figure 3 This is a cross-sectional view of a hedge trimmer according to one embodiment of this application;

[0020] Figure 4 This is a schematic diagram of a rotating striking block in one embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the output shaft in one embodiment of this application;

[0022] Figure 6 This is a schematic diagram of a planetary carrier in one embodiment of this application;

[0023] Figure 7 This is a schematic diagram of an internal gear ring in one embodiment of this application;

[0024] Figure 8 This is a schematic diagram of an eccentric circular drive block in one embodiment of this application;

[0025] Figure 9 This is a schematic diagram of the drive sleeve in one embodiment of this application.

[0026] Explanation of key figure labels:

[0027] 100-Hedge trimmer, 10-House, 20-Blade, 30-Drive mechanism, 31-Power source, 32-Rotating striking block, 321-Stop block, 33-Output shaft, 331-Protrusion, 332-Plug-in part, 341-Planetary carrier, 3411-Drive shaft, 3412-V-groove, 342-Gear, 343-Internal gear ring, 344-Steel ball, 35-Reset part, 36-Eccentric circular drive block, 361-Cylinder, 362-Socket, 37-Drive sleeve, 371-First circular hole, 372-Second circular hole. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0029] like Figure 1-3As shown, a hedge trimmer 100 in one embodiment of this application includes a housing 10, two blades 20, and a drive mechanism 30. One end of each blade 20 extends into the housing 10, and the drive mechanism 30 drives at least one of the blades 20 to reciprocate, thereby performing a cutting operation. The drive mechanism 20 includes a power source 31, a rotary striking assembly, and an output shaft 33 connected in sequence. The power source 31 is connected to and drives the output shaft 33 to rotate via the rotary striking assembly, and the output shaft 33 is connected to and drives at least one of the blades 20 to reciprocate.

[0030] When encountering a thick branch or other object to be cut, causing the blade 20 to be obstructed and unable to rotate, the output shaft 33 also cannot rotate. At this time, the rotating impact component can apply an impact force in the rotational direction to the output shaft 33, thereby increasing the force transmitted to the blade 20, that is, the shearing force acting on the branch, thus attempting to cut the branch. If a single impact fails to cut the branch, the above impact operation is repeated until the branch is completely cut off.

[0031] Specifically, the rotating impact assembly includes a steel ball 344, and a planetary carrier 341, a reset member 35, and a rotating impact block 32 connected in sequence. The rotating impact block 32 has a circular hole along its own axial direction. The planetary carrier 341 has a drive shaft 3411 protruding into the circular hole. A V-groove 3412 is provided on the side wall of the drive shaft 3411. Correspondingly, a groove (not shown) is provided on the inner wall of the circular hole of the rotating impact block 32. The steel ball 344 is disposed in the V-groove 3412 and the groove. The planetary carrier 341 is connected to a power source 31 and is driven by the power source 31 to rotate. Under the action of the steel ball 344, the V-groove 3412, and the groove, the planetary carrier 341 drives the rotating impact block 32 to rotate.

[0032] Preferably, two V-grooves 3412 (as described above) are provided on the side wall of the drive shaft 3411, and correspondingly, two grooves (not shown) are provided on the inner wall of the circular hole of the rotating impact block 32. A steel ball 344 is placed in each set of grooves, and the two grooves are located on the same diameter of the circular hole of the rotating impact block 32. This arrangement reduces the force on a single steel ball 344 and a single set of V-grooves 3412 and grooves, thus improving the stability during operation.

[0033] To drive the planetary carrier 341 to rotate, the rotating impact assembly also includes multiple gears 342 fixed inside the planetary carrier 341, and an internal gear ring 343 sleeved outside the planetary carrier 341 and meshing with all the gears 342. The internal gear ring 343 is fixedly connected to the housing 10, and the power source 31 is connected to and drives the internal gear ring 343 to rotate, thereby driving the gears 342 and the planetary carrier 341 to rotate.

[0034] A protrusion 331 extends radially outward from the end of the output shaft 33 near the rotating impact block 32, and a stop 321 extends radially from the end of the rotating impact block 32 facing the output shaft 33. Under normal operating conditions, the steel ball 344 is located at the bottom of the V-groove 3412. When the rotating impact block 32 rotates, the stop 321 abuts against the protrusion 331 (e.g., in…). Figure 5 In the middle, the stop block 321 abuts against the a-surface of the protrusion 331, thereby pushing the protrusion 331 and the output shaft 33 to rotate. When the blade encounters a thick branch or other object to be cut and cannot cut it immediately, the output shaft 33 is obstructed and cannot rotate. At this time, the stop block 321 is still rotating at high speed, so it will move against the protrusion 331 in a direction away from the output shaft 33 (i.e., Figure 5 (Moving upwards in the middle), at this time, the steel ball 344 moves to the top of one side of the V-groove 3412, and the reset member 35 is compressed. When the stop block 321 moves to the top b surface of the protrusion 331, the resistance in the rotation direction of the stop block 321 disappears and it continues to rotate until it moves to the other c surface of the protrusion 331. Then, the reset member 35 pushes the main body of the rotating impact block 32 to move towards the output shaft 33, while the steel ball 344 returns to the bottom of the V-groove 3412. When the stop block 321 continues to rotate forward, it hits the a surface and drives the protrusion 331 and the output shaft 33 to continue rotating. When this impact process is transmitted to the blade 20, it can increase the shearing force on the branch and cut the branch. If it still cannot cut the branch, the drive mechanism 30 repeats the above impact action until the branch is cut.

[0035] During the rotation of the stop 321, which moves to the other side of the protrusion 331 and continues to rotate forward until it contacts the protrusion 331 again, the stop 321 is not obstructed, that is, the stop 321 has no load or resistance. Therefore, its rotation speed increases, which can further increase the impact force when it hits the protrusion 331, thereby increasing the probability of cutting the tree branch.

[0036] Preferably, two protrusions 331 extend from the output shaft 33, and these two protrusions 331 are on the same diameter. Correspondingly, two stops 321, also on the same diameter, are provided on the rotating impact block 32. Therefore, during operation, the two sets of protrusions 331 and stops 321 work simultaneously. Stop 321a abuts against the a-side of protrusion 331a, moves upward when obstructed, and after moving from the top b-side of protrusion 331a to the c-side on the other side, moves downward under the action of the reset member 35 and continues to rotate, impacting the a-side of protrusion 321b. Similarly, stop 321b abuts against the a-side of protrusion 331b, moves upward when obstructed, and after moving from the top B-side of protrusion 331b to the c-side on the other side, continues to rotate, and finally impacts the a-side of protrusion 321a. The above operation is repeated until the cutting is completed.

[0037] The arrangement of two sets of protrusions 331 and stops 321 is more stable than that of a single set of protrusions 331 and stops 321. During the striking process, the rotating striking block 32 rotates once to perform two striking actions. Compared with a larger number of sets of protrusions 331 and stops 321, this arrangement ensures the rotational distance of the stops 321 before the striking action, thereby ensuring the impact force. This avoids the situation where a large number of protrusions 321 and stops 321 sets result in a shorter rotational distance, weakened single impact force, and the need for frequent striking actions, which would affect work efficiency.

[0038] The reset element 35 is sleeved on the drive shaft 3411 and positioned between the planetary carrier 341 and the rotating impact block 32. In one embodiment, the reset element 35 may be a spring compressed between the stop block 321 and the planetary carrier 341. As the stop block 321 moves to the top of the protrusion 331, the spring is further compressed and stores energy. When the stop block 321 moves to the other end of the protrusion 331, the spring releases the stored energy and pushes the rotating impact block 32 toward the output shaft 33, thus preventing the power source 31 from idling.

[0039] Preferably, the drive mechanism 30 drives the two blades 20 to reciprocate in opposite directions. The simultaneous operation of the two blades 20 allows them to act on the object to be cut from both ends at the same time, resulting in greater cutting force and better cutting effect.

[0040] Specific driving methods are as follows: Figure 3 , 8 As shown in Figure 9, the drive mechanism 30 includes an eccentric circular drive block 36 and two drive sleeves 37. The eccentric circular drive block 36 is as follows: Figure 8 As shown, it includes two eccentrically positioned cylinders 361. The drive sleeve 37 is as follows... Figure 9 The plate-like structure shown has two circular holes, a first circular hole 371 and a second circular hole 372, at each end. The first circular hole 371 is larger and is used to fit onto one of the cylinders 361 on the eccentric circular drive block 36. A cylinder is also provided on the blade 20, and the smaller second circular hole 372 fits onto the cylinder of the blade 20. An insertion hole 362 for the output shaft 33 is formed on one of the cylinders of the eccentric circular drive block 36, and this insertion hole 362 is located near the center of the entire eccentric circular drive block 36. Driven by the output shaft 33, the eccentric circular drive block 36 rotates, and because the two cylinders 361 are eccentrically positioned, the two drive sleeves 37 drive the two blades 20 to move alternately, thereby completing the cutting.

[0041] Preferably, socket 362 is as follows Figure 8 The cross-shaped socket shown corresponds to an output shaft 33 with a cross-shaped insertion part 332 at its end to prevent slippage or stripping during rotation. Of course, the socket 362 can also be rectangular or other non-circular shapes; this embodiment is not limited to these designs.

[0042] In this embodiment, the hedge trimmer 100 can be either oil-driven or electric-driven, meaning that the power source 31 can be a gasoline engine, a diesel engine, or an electric motor; this embodiment does not impose any restrictions.

[0043] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this application is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this application. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A hedge trimmer, characterized in that, include: Shell (10); Two blades (20), one end of which extends into the housing (10); The drive mechanism includes a power source (31), a rotary impact assembly, and an output shaft (33) connected in sequence. The power source (31) is connected to and drives the output shaft (33) to rotate through the rotary impact assembly. The output shaft (33) is connected to and drives at least one of the blades (20) to reciprocate. When the blade (20) is obstructed, the rotary impact assembly applies an impact force in the direction of rotation to the output shaft (33).

2. The hedge trimmer according to claim 1, characterized in that, The rotating impact assembly includes a steel ball (344), and a planetary carrier (341), a reset member (35), and a rotating impact block (32) connected in sequence. The rotating impact block (32) has a circular hole along its own axial direction. The planetary carrier (341) has a drive shaft (3411) protruding into the circular hole. The drive shaft (3411) has a V-groove (3412) on its side wall and a groove on the inner wall of the circular hole. The steel ball (344) is disposed in the V-groove (3412) and the groove.

3. The hedge trimmer according to claim 2, characterized in that, The drive shaft (3411) is provided with two V-grooves (3412), and the inner wall of the circular hole is provided with two grooves, and the two grooves are located on the same diameter of the circular hole.

4. The hedge trimmer according to claim 2, characterized in that, The reset component (35) is sleeved on the drive shaft (3411) and disposed between the planet carrier (341) and the rotating impact block (32).

5. The hedge trimmer according to claim 3, characterized in that, The rotating impact assembly also includes a plurality of gears (342) fixed inside the planetary carrier (341) and an internal gear ring (343) sleeved outside the planetary carrier (341) and meshing with the gears (342), the internal gear ring (343) being fixedly connected to the housing (10).

6. The hedge trimmer according to claim 2, characterized in that, The power source (31) is connected to and drives the planetary carrier (341) to rotate. One end of the output shaft (33) has a protrusion (331) extending radially. The rotating impact block (32) is provided with a stop (321) extending toward the output shaft (33). When the stop (321) rotates, it abuts against and pushes the protrusion (331) and the output shaft (33) to rotate.

7. The hedge trimmer according to claim 6, characterized in that, Two protrusions (331) are symmetrically arranged on the output shaft (33), and two stops (321) are arranged on the rotating impact block (32).

8. The hedge trimmer according to claim 1, characterized in that, The drive mechanism drives the two blades (20) to reciprocate in opposite directions.

9. The hedge trimmer according to claim 8, characterized in that, The drive mechanism includes an eccentric circular drive block (36) and two drive sleeves (37). The eccentric circular drive block (36) includes two eccentrically arranged cylinders, one of which is provided with a socket (362) for the output shaft to be inserted. Each blade (20) has a cylindrical drive post protruding from it. One end of the two drive sleeves is provided with a first circular hole (371) respectively fitted onto the two cylinders, and the other end is provided with a second circular hole (372) respectively fitted onto the two drive posts.

10. The hedge trimmer according to claim 9, characterized in that, The socket (362) is a cross-shaped socket, and the end of the output shaft (33) includes a cross-shaped plug portion (332) that matches the cross-shaped socket.

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