Multifunctional grass trimmer

Abstract

The utility model relates to the technical field of garden equipment, and discloses a multifunctional grass trimmer which comprises a handheld seat, a first connecting pipe arranged on the lower side of the handheld seat, a power supply unit arranged at one end of the first connecting pipe, and a tool bit assembly arranged at the end, away from the power supply unit, of the first connecting pipe. A machine shell is arranged at the end, close to the tool bit assembly, of the first connecting pipe, a middle motor is arranged in the machine shell, the tool bit assembly comprises a tool apron, a cutting knife rotationally connected to the tool apron and a second connecting pipe with one end connected with the tool apron, and a butt joint pipe allowing the end, away from the tool apron, of the second connecting pipe to be embedded is arranged at the output end of the middle motor. A transmission shaft is arranged in the second connecting pipe, a first transmission piece used for connecting an output shaft of the middle motor with the end of the transmission shaft is arranged in the butt joint pipe, a second transmission piece used for connecting the cutting knife with the end of the transmission shaft is arranged on the knife holder, and a connecting piece used for detachably connecting the end of the second connecting pipe into the butt joint pipe is arranged on the machine shell.

Description

Technical Field

[0001] This utility model belongs to the field of garden equipment technology, and specifically relates to a multi-functional lawn mower. Background Technology

[0002] A lawnmower is a handheld tool used to cut weeds in lawns, gardens, pastures, and other similar areas. Based on the power source, it can be divided into hydraulic and electric types; based on the power head structure, it can be divided into front-powered and rear-powered types.

[0003] Currently, Chinese Patent Publication No. CN222193152U, published on December 20, 2024, discloses a lawn mower or brush cutter, comprising an output device housing unit, particularly a motor housing unit, and a protection unit. The protection unit includes a wire bow, which can be oscillatingly moved from a stopped position to a used position. The output device housing unit or motor housing unit has a locking recess in the area of ​​the split joint of the output device housing or motor housing for locking the wire bow in the used position, and / or the output device housing unit or motor housing unit has a oscillating stop unit for the wire bow that protrudes radially relative to the output shaft or motor axis. The oscillating stop unit includes two oscillating stop elements, and the oscillating stop unit is constructed as an angular or L-shaped oscillating guide element and / or oscillating stop element, preferably an oscillating guide surface and / or an oscillating stop surface.

[0004] However, the blades of this type of lawn mower or brush cutter cannot be quickly changed, making it impossible to adapt to various lawn mowing needs by changing the blades, which ultimately hinders the use of different blade combinations. Utility Model Content

[0005] The purpose of this invention is to provide a multi-functional grass cutter that allows for convenient replacement of the blade assembly.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a multi-functional grass cutter, including a handheld base, a first connecting pipe disposed on the lower side of the handheld base, a power supply unit disposed at one end of the first connecting pipe, and a blade assembly disposed at the end of the first connecting pipe away from the power supply unit. A housing is disposed at the end of the first connecting pipe near the blade assembly. A central motor is disposed inside the housing. The blade assembly includes a blade holder, a cutting blade rotatably connected to the blade holder, and a second connecting pipe with one end connected to the blade holder. A connecting pipe is disposed at the output end of the central motor for the second connecting pipe to be inserted at the end away from the blade holder. A drive shaft is disposed inside the second connecting pipe. A first transmission component is disposed inside the connecting pipe for connecting the output shaft of the central motor to the end of the drive shaft. A second transmission component is disposed on the blade holder for connecting the cutting blade to the end of the drive shaft. A connecting component is disposed on the housing for detachably connecting the end of the second connecting pipe to the connecting pipe.

[0007] By adopting the above technical solution, the housing is located at one end of the first connecting pipe near the blade assembly, and the central motor is located inside the housing. Compared with a front-mounted motor, the central motor reduces the weight of the blade assembly, which makes it easier for the operator to control the blade assembly for mowing. Compared with a rear-mounted motor, the central motor requires a shorter drive shaft, which helps to improve transmission efficiency. Ultimately, this achieves both a lighter blade assembly and higher transmission efficiency for the central motor.

[0008] Simultaneously, the first transmission component connects the output shaft of the central motor to the end of the transmission shaft, while the second transmission component connects the cutting blade to the end of the transmission shaft. This allows the central motor to drive the cutting blade to rotate via the transmission shaft. The end of the second connecting pipe is detachably connected to the connecting pipe using a connector. This enables the blade assembly to be detachably connected at the central motor position, facilitating the replacement of the blade assembly and allowing for the use of different types of blades to accommodate various lawn mowing techniques.

[0009] The present invention is further configured such that: the first transmission component includes a drive gear disposed on the output shaft of the central motor, a spline sleeve rotatably connected to the connecting tube and extending one end to the upper side of the drive gear, a driven gear keyed to the end of the spline sleeve and meshing with the drive gear, and a spline shaft disposed at one end of the transmission shaft and used for insertion into the spline sleeve.

[0010] By adopting the above technical solution, when the second connecting pipe is inserted into the connecting pipe, the splined shaft at the end of the drive shaft can be embedded in the splined sleeve. After the central motor is started, the central motor can drive the drive gear to rotate, and the drive gear can drive the splined sleeve to rotate through the driven gear, and finally drive the drive shaft to rotate.

[0011] A further feature of this invention is that the second transmission component includes a first bevel gear fixed to the end of the transmission shaft, a cutter shaft connected to the cutting blade, and a second bevel gear disposed on the upper end of the cutter shaft and meshing with the first bevel gear.

[0012] By adopting the above technical solution, when the drive shaft rotates, the drive shaft can drive the cutter shaft to rotate by meshing the first bevel gear and the second bevel gear, and finally drive the cutting blade to perform a rotary cutting operation.

[0013] A further feature of this invention is as follows: a long groove with an extension direction parallel to the extension direction of the connecting pipe is provided on the side of the connecting pipe away from the central motor; a first connecting plate is provided at the end of the connecting pipe and on one side of the long groove; a second connecting plate is provided at the end of the connecting pipe and on the other side of the long groove; a first through hole is provided on the first connecting plate; a second through hole is provided on the second connecting plate; a nut groove is provided at the end of the second through hole; a connecting nut is embedded in the nut groove; a threaded shaft is provided at the end of the connecting pipe that passes through the first through hole and the second through hole and is threadedly connected to the connecting nut; a knob is also provided at the end of the threaded shaft away from the connecting nut.

[0014] By adopting the above technical solution, when the end of the second connecting pipe is embedded in the connecting pipe, the threaded shaft is rotated by the knob. Since the connecting nut is embedded in the nut groove, the first connecting plate and the second connecting plate can be offset towards each other. Finally, the connecting pipe can be tightened at one end of the long groove to hold the end of the second connecting pipe, which is conducive to the stable insertion of the end of the second connecting pipe in the connecting pipe.

[0015] The present invention is further configured as follows: the connecting member includes a swing arm disposed on the upper side of the connecting tube, a swing shaft disposed on both sides of the middle part of the swing arm, a connecting ear disposed on the upper side of the connecting tube and located at the swing shaft position, a shaft groove opened on the connecting ear for the swing shaft to be embedded, a pressing block disposed at one end of the swing arm, an opening groove opened on the housing for the pressing block to pass through, a return spring having one end abutting against the lower side of the pressing block and the other end abutting against the upper side of the connecting tube, a positioning hook disposed at the end of the swing arm away from the pressing block, a first hook hole opened on the connecting tube for the positioning hook to pass through, and a second hook hole opened on the second connecting tube for the positioning hook to pass through.

[0016] By adopting the above technical solution, when the end of the second connecting tube needs to be embedded in the connecting tube, first press the pressing block in the opening groove, so that the return spring is compressed and the positioning hook swings upward. Then the second connecting tube can be smoothly embedded in the connecting tube. Then release the pressing block. At this time, under the elastic restoring force of the return spring, the positioning hook can pass through the first hook hole and then into the second hook hole. At this time, the end of the second connecting tube in the connecting tube can be positioned by the positioning hook. When it is necessary to disassemble the second connecting tube, simply press the pressing block in the opening groove again to make the positioning hook disengage from the first hook hole and the second hook hole, and the second connecting tube in the connecting tube can be pulled out. Finally, the detachable connection of the second connecting tube in the connecting tube can be realized.

[0017] A further feature of this invention is that a positioning platform is provided on the upper side of the connecting tube, which is inserted into the return spring.

[0018] By adopting the above technical solution, the positioning table is inserted into the return spring through the connecting pipe to locate the position of the return spring.

[0019] The beneficial effects of this utility model are as follows: Firstly, the housing is located at one end of the first connecting pipe near the blade assembly, and the central motor is located inside the housing. Compared to a front-mounted motor, the central motor reduces the weight of the blade assembly, making it easier for operators to control the blade assembly for mowing. Secondly, compared to a rear-mounted motor, the required drive shaft length for the central motor is shorter, which helps improve transmission efficiency. Ultimately, this achieves both a lighter blade assembly and higher transmission efficiency for the central motor.

[0020] Simultaneously, when the end of the second connecting tube needs to be embedded in the connecting tube, first press the pressing block in the slot to compress the return spring and swing the positioning hook upwards. Then, the second connecting tube can be smoothly embedded in the connecting tube. Release the pressing block, and under the elastic restoring force of the return spring, the positioning hook can pass through the first hook hole and then into the second hook hole. Then, rotate the threaded shaft by turning the knob. Since the connecting nut is embedded in the nut groove, the first connecting plate and the second connecting plate will shift towards each other, causing the end of the connecting tube in the long slot to narrow. Then, the end of the second connecting tube is tightened to facilitate stable insertion of the second connecting tube end into the connecting tube. At this time, the end of the second connecting tube in the connecting tube can be positioned. When it is necessary to disassemble the second connecting tube, simply loosen the knob and press the pressing block in the opening slot again to disengage the positioning hook from the first hook hole and the second hook hole, and then pull out the second connecting tube in the connecting tube. Finally, the second connecting tube can be detached in the connecting tube, which makes it convenient to replace the blade assembly and use different types of blades to match various lawn mowing methods. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a partial exploded view of the casing of this utility model;

[0024] Figure 3 This is a partial exploded view of the connection relationship between the centrally mounted motor, the connecting pipe, and the second connecting pipe in this utility model;

[0025] Figure 4 This is a partially enlarged view of the connection relationship between the centrally located motor and the first positioning component in this utility model;

[0026] Figure 5 This is a partial structural cross-sectional view of the cutter head assembly in this utility model;

[0027] Figure 6 This is a partially exploded view of the connection relationship between the butt joint and the threaded shaft in this utility model;

[0028] Figure 7 This is a partial sectional view of the connection relationship between the centrally mounted motor, the connecting pipe, and the connector in this utility model;

[0029] Figure 8 This is a structural diagram of the present invention when it combines multiple cutter head assemblies.

[0030] In the diagram, 1. Handheld base; 2. First connecting pipe; 21. Power supply unit; 3. Cutter head assembly; 31. Cutter holder; 32. Cutting blade; 33. Second connecting pipe; 331. Drive shaft; 4. Housing; 41. Centrally mounted motor; 42. Connecting pipe; 421. Long slot; 422. First connecting plate; 4221. First through hole; 423. Second connecting plate; 4231. Second through hole; 4232. Nut slot; 4233. Connecting nut; 424. Threaded shaft; 424 1. Knob; 425. Positioning platform; 5. First transmission component; 51. Driving gear; 52. Spline sleeve; 53. Driven gear; 54. Spline shaft; 6. Second transmission component; 61. First bevel gear; 62. Cutter shaft; 63. Second bevel gear; 7. Connecting component; 71. Swing arm; 72. Swing shaft; 73. Connecting ear; 74. Shaft groove; 75. Pressing block; 76. Opening groove; 77. Return spring; 78. Positioning hook; 79. First hook hole; 80. Second hook hole. Detailed Implementation

[0031] The technical solutions in the embodiments will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0032] A multi-functional lawn mower, as shown in the reference Figure 1The multi-functional grass cutter includes a handheld base 1, a first connecting pipe 2, a power supply unit 21, and a blade assembly 3. The first connecting pipe 2 is fixed to the lower side of the handheld base 1 by bolts, while the power supply unit 21 is installed at one end of the first connecting pipe 2. The power supply unit 21 is mainly a battery pack, while the blade assembly 3 is installed at the end of the first connecting pipe 2 away from the power supply unit 21.

[0033] Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 The first connecting pipe 2 is bolted to the housing 4 at one end near the cutter head assembly 3. A central motor 41 is bolted inside the housing 4. The cutter head assembly 3 includes a cutter holder 31, a cutting blade 32 rotatably connected to the cutter holder 31, and a second connecting pipe 33 connected at one end to the cutter holder 31. The output end of the central motor 41 is bolted to a connecting pipe 42 for inserting the end of the second connecting pipe 33 away from the cutter holder 31. A drive shaft 331 is rotatably connected to the second connecting pipe 33 via a bearing. The connecting pipe 42 contains a mechanism for transmitting the output power of the central motor 41. The first transmission component 5, which is connected to the end of the output shaft and the transmission shaft 331, includes a drive gear 51, a spline sleeve 52, a driven gear 53, and a spline shaft 54. The drive gear 51 is keyed to the output shaft of the central motor 41, while the spline sleeve 52 is rotatably connected to the connecting pipe 42 via a bearing and extends to the upper side of the drive gear 51 at one end. Meanwhile, the driven gear 53 is keyed to the end of the spline sleeve 52 and meshes with the drive gear 51, while the spline shaft 54 ​​is integrally set at one end of the transmission shaft 331 and is used to insert into the spline sleeve 52.

[0034] Reference Figure 1 , Figure 5 The tool holder 31 is provided with a second transmission component 6 for connecting the cutting blade 32 to the end of the transmission shaft 331. The second transmission component 6 includes a first bevel gear 61, a tool shaft 62, and a second bevel gear 63. The first bevel gear 61 is fixed to the end of the transmission shaft 331, while the tool shaft 62 is fixedly connected to the cutting blade 32. Meanwhile, the second bevel gear 63 is fixed to the upper end of the tool shaft 62 and meshes with the first bevel gear 61.

[0035] Reference Figure 1 , Figure 2 , Figure 6The connecting pipe 42 has an elongated groove 421 extending parallel to the extension direction of the connecting pipe 42 on the side away from the central motor 41. A first connecting plate 422 is integrally formed at the end of the connecting pipe 42 and on one side of the elongated groove 421. A second connecting plate 423 is integrally formed at the end of the connecting pipe 42 and on the other side of the elongated groove 421. A first through hole 4221 is formed on the first connecting plate 422, and a second through hole 4231 is formed on the second connecting plate 423. A nut groove 4232 is formed at the end of the second through hole 4231. A connecting nut 4233 is embedded in the nut groove 4232. A threaded shaft 424 is provided at the end of the connecting pipe 42, passing through the first through hole 4221 and the second through hole 4231 and threadedly connected to the connecting nut 4233. A knob 4241 is fixed at the end of the threaded shaft 424 away from the connecting nut 4233.

[0036] Reference Figure 2 , Figure 3 , Figure 7 The housing 4 is also provided with a connector 7 for detachably connecting the end of the second connecting pipe 33 to the connecting pipe 42. This connector 7 includes a swing arm 71, a swing shaft 72, a connecting ear 73, a shaft groove 74, a pressing block 75, an opening groove 76, a return spring 77, a positioning hook 78, a first hook hole 79, and a second hook hole 80. The swing arm 71 is located on the upper side of the connecting pipe 42, while the swing shaft 72 is integrally formed on both sides of the middle portion of the swing arm 71. The connecting ear 73 is integrally formed on the upper side of the connecting pipe 42 and located at the position of the swing shaft 72. The shaft groove 74 is formed on the connecting ear 73 and provides space for the swing shaft 72. 2. Embedded, wherein the pressing block 75 is integrally set at one end of the swing arm 71, and the opening slot 76 is opened on the housing 4 and allows the pressing block 75 to pass through. At the same time, the return spring 77 is pressed against the lower side of the pressing block 75 at one end and against the upper side of the connecting tube 42 at the other end. The upper side of the connecting tube 42 is integrally set with a positioning platform 425 that passes through the return spring 77. The positioning hook 78 is integrally set at the end of the swing arm 71 away from the pressing block 75. The first hook hole 79 is opened on the connecting tube 42 and allows the positioning hook 78 to pass through. At the same time, the second hook hole 80 is opened on the second connecting tube 33 and allows the positioning hook 78 to pass through.

[0037] Principle: First, the housing 4 is located near the end of the first connecting pipe 2 close to the blade assembly 3, and the central motor 41 is located inside the housing 4. Compared with a front-mounted motor, the central motor 41 can reduce the weight of the blade assembly 3, which makes it easier for the operator to control the blade assembly 3 for mowing. Compared with a rear-mounted motor, the drive shaft 331 required by the central motor 41 is shorter, which helps to improve transmission efficiency. Ultimately, it is possible to ensure that the blade assembly 3 has a small weight while also ensuring that the central motor 41 has high transmission efficiency.

[0038] Simultaneously, when the end of the second connecting tube 33 needs to be embedded in the connecting tube 42, first press the pressing block 75 in the opening slot 76, so that the return spring 77 is compressed and the positioning hook 78 swings upward. Then the second connecting tube 33 can be smoothly embedded in the connecting tube 42. Then release the pressing block 75. At this time, under the elastic restoring force of the return spring 77, the positioning hook 78 can pass through the first hook hole 79 and then into the second hook hole 80. Then rotate the threaded shaft 424 by the knob 4241. Since the connecting nut 4233 is embedded in the nut groove 4232, the first connecting plate 422 and the second connecting plate 423 can be offset towards each other, so that the connecting tube 42 is located in the long slot. After one end of 421 is narrowed, it is tightened to hold the end of the second connecting tube 33, which facilitates the stable insertion of the end of the second connecting tube 33 into the connecting tube 42. At this time, the end of the second connecting tube 33 in the connecting tube 42 can be positioned. When it is necessary to disassemble the second connecting tube 33, simply loosen the knob 4241 and press the pressing block 75 in the opening slot 76 again to make the positioning hook 78 disengage from the first hook hole 79 and the second hook hole 80, and then pull out the second connecting tube 33 in the connecting tube 42. Finally, the second connecting tube 33 can be detached in the connecting tube 42, which makes it convenient to replace the blade assembly 3 to use different types of blades to match various lawn mowing methods.

Claims

1. A multi-functional lawn mower, comprising a handheld base (1), a first connecting pipe (2) disposed on the lower side of the handheld base (1), a power supply unit (21) disposed at one end of the first connecting pipe (2), and a cutter assembly (3) disposed at the end of the first connecting pipe (2) away from the power supply unit (21), characterized in that: A housing (4) is provided at one end of the first connecting pipe (2) near the cutter head assembly (3). A central motor (41) is provided inside the housing (4). The cutter head assembly (3) includes a cutter holder (31), a cutting blade (32) rotatably connected to the cutter holder (31), and a second connecting pipe (33) with one end connected to the cutter holder (31). The output end of the central motor (41) is provided with a connecting pipe (42) for the end of the second connecting pipe (33) away from the cutter holder (31) to be inserted. The second connecting pipe (33) is provided with a drive shaft (331), the connecting pipe (42) is provided with a first transmission component (5) for connecting the output shaft of the central motor (41) to the end of the drive shaft (331), the blade holder (31) is provided with a second transmission component (6) for connecting the cutting blade (32) to the end of the drive shaft (331), and the housing (4) is provided with a connector (7) for detachably connecting the end of the second connecting pipe (33) to the connecting pipe (42).

2. The multi-functional lawn mower according to claim 1, characterized in that: The first transmission component (5) includes a drive gear (51) disposed on the output shaft of the central motor (41), a spline sleeve (52) rotatably connected in the connecting tube (42) and extending to the upper side of the drive gear (51) at one end, a driven gear (53) keyed to the end of the spline sleeve (52) and meshing with the drive gear (51), and a spline shaft (54) disposed at one end of the transmission shaft (331) and used to be inserted into the spline sleeve (52).

3. The multi-functional lawn mower according to claim 1, characterized in that: The second transmission component (6) includes a first bevel gear (61) fixed to the end of the transmission shaft (331), a cutter shaft (62) connected to the cutting blade (32), and a second bevel gear (63) disposed on the upper end of the cutter shaft (62) and meshing with the first bevel gear (61).

4. A multi-functional lawn mower according to claim 1, characterized in that: The connecting pipe (42) has an elongated groove (421) on its side away from the central motor (41), with its extension direction parallel to that of the connecting pipe (42). A first connecting plate (422) is provided at the end of the connecting pipe (42) on one side of the elongated groove (421), and a second connecting plate (423) is provided at the end of the connecting pipe (42) on the other side of the elongated groove (421). A first through hole (4221) is provided on the first connecting plate (422), and a second connecting plate (423) is provided on the second connecting plate (423). The connector (42) has a second through hole (4231) and a nut groove (4232) at the end of the second through hole (4231). A connecting nut (4233) is embedded in the nut groove (4232). The end of the connector (42) is provided with a threaded shaft (424) that passes through the first through hole (4221) and the second through hole (4231) and is threaded into the connecting nut (4233). A knob (4241) is also provided at the end of the threaded shaft (424) away from the connecting nut (4233).

5. A multi-functional lawn mower according to claim 1, characterized in that: The connector (7) includes a swing arm (71) disposed on the upper side of the connecting tube (42), a swing shaft (72) disposed on both sides of the middle part of the swing arm (71), a connecting ear (73) disposed on the upper side of the connecting tube (42) and located at the position of the swing shaft (72), a shaft groove (74) opened on the connecting ear (73) for the swing shaft (72) to be inserted, a pressing block (75) disposed at one end of the swing arm (71), an opening groove (76) opened on the housing (4) for the pressing block (75) to pass through, a return spring (77) with one end abutting against the lower side of the pressing block (75) and the other end abutting against the upper side of the connecting tube (42), a positioning hook (78) disposed at the end of the swing arm (71) away from the pressing block (75), a first hook hole (79) opened on the connecting tube (42) for the positioning hook (78) to pass through, and a second hook hole (80) opened on the second connecting tube (33) for the positioning hook (78) to pass through.

6. A multi-functional lawn mower according to claim 5, characterized in that: The upper side of the connecting tube (42) is provided with a positioning platform (425) that passes through the return spring (77).

Images