Mowing cutter assembly

Abstract

A mowing cutter assembly comprises a cutter plate, a disc seat and two cutter rope pieces detachably arranged between the cutter plate and the disc seat, the cutter plate comprises two cutting edges and two receding concave portions, and the disc seat comprises two penetrating and clamping holes and two expanding grooves which are formed in the side, away from the cutter plate, of the disc seat in a concave mode and communicated with the two penetrating and clamping holes respectively. The two expanding grooves face the two cutting edges respectively, the two knife rope pieces are clamped in the two penetrating and clamping holes of the disc base respectively, due to the fact that the knife board is provided with the two receding concave portions, when the knife board rotates at a high speed, the knife rope pieces are not prone to directly colliding with the edge of the knife board, the service life of the knife rope pieces is prolonged, and due to the fact that the two expanding grooves are formed in the disc base in a concave mode, the knife rope pieces are not prone to colliding with the edge of the knife board. And the moving space of the knife rope piece during disassembly and assembly can be increased, and the convenience of assembly is improved.

Description

Technical Field

[0001] This utility model relates to a lawn mowing blade installed on a lawnmower, and more particularly to an attached lawn mowing blade assembly, which can improve the problem that the blade rope is easily damaged by collision with the blade plate when cutting weeds. Background Technology

[0002] Please refer to Figure 8 The existing lawn mower blade 90 is mainly installed on a handheld lawn mower and includes a blade plate 91, a disc base 93, and two blade ropes 92. The blade plate 91 is a long plate with inclined cutting edges 911 on its opposite short sides. Each cutting edge 911 has several stepped cutting teeth. The disc base 93 has two through holes 934. The two blade ropes 92 are respectively locked in the two through holes 934 of the disc base 93 and sandwiched between the disc base 93 and the blade plate 91. The power shaft of the lawn mower passes through the disc base 93 and the blade plate 91 and is locked with bolts, thus combining the lawn mower blade 90 with the handheld lawn mower.

[0003] When the drive unit of the handheld lawnmower drives the mowing blade 90 to rotate rapidly, it can cut weeds simultaneously through the blade plate 91 and the blade rope 92. The rigid metal blade plate 91 can cut off thicker weeds or plants, while the blade rope 92 can be used to cut off thinner weeds or weeds located near walls or rocks.

[0004] However, since the relatively long sides of the blade 91 are all straight, when the mowing blade 90 rotates rapidly, the rope of the cord 92 is very likely to hit the long side of the blade 91, making the cord 92 very easy to damage. Secondly, since the through hole 934 of the disc base 93 is elongated, the space is just enough to accommodate the fixing block 921 of the cord 92. Therefore, when the cord 92 is inserted from the side away from the blade 91, the fixing block 921 at the end does not have enough room to move during the insertion into the through hole 934, making it difficult to directly lock into the through hole 934. Furthermore, when the user needs to replace the cord 92, it is also difficult to directly remove the fixing block 921 from the through hole 934 from the side of the disc base 93 away from the blade 91, which needs to be improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies, the main purpose of this utility model is to provide a lawn mower assembly that can improve the problem that the blade cord is prone to collision with the edge of the blade plate and is easily damaged when the lawn mower assembly rotates rapidly, and can also improve the convenience of assembling and disassembling the blade cord.

[0006] To achieve the above objectives, the lawn mowing tool assembly provided by this utility model includes:

[0007] A blade plate has two cutting edges, two long edges, two recessed recesses, and a blade plate mounting hole. The two cutting edges are located at opposite ends of the blade plate. Each cutting edge is inclined and has multiple stepped toothed blades. Each cutting edge is connected to a long edge and a recessed recess on opposite sides. Each cutting edge is inclined from the corresponding recessed recess toward the corresponding long edge. The multiple stepped toothed blades face the corresponding long edge. A stepped recess is formed between two adjacent toothed blades. Each recessed recess gradually moves away from the corresponding cutting edge from the opposite long edge and connects to the other long edge. The blade plate mounting hole is formed in the middle section of the blade plate.

[0008] A tray base is located on one side of the blade plate and has a tray base mounting hole, two through holes, and two expansion slots. The tray base mounting hole is located in the center of the tray base and aligned with the blade plate mounting hole. The two through holes are located on opposite radial sides of the tray base mounting hole. The two expansion slots are recessed on the side of the tray base away from the blade plate and communicate with the two through holes. The two expansion slots face the two cutting edges of the blade plate.

[0009] Two knife rope components are detachably disposed between the blade plate and the disc base, and are respectively engaged in the two through holes of the disc base. Each knife rope component includes a rope and a fixing block attached to the end of the rope and engaged in the corresponding through hole. The rope of each knife rope component extends away from the corresponding expansion groove and protrudes from the disc base, and is located on one side of the corresponding relief recess.

[0010] Because the blade has two recessed recesses, when the grass-cutting blade assembly of this invention is driven to rotate at high speed by the drive device, the blade cord is less likely to directly collide with the edge of the blade, thus making the blade cord less prone to damage and extending its service life. In addition, because the side of the disc base away from the blade has two recessed slots that are respectively connected to the two through holes, the space for the fixing block to move during the assembly and disassembly of the blade cord can be increased through each slot. This allows the user to more easily insert the blade cord from the side of the disc base away from the blade and snap the fixing block into the corresponding through hole, or remove the fixing block from the through hole, improving the convenience of installation. Attached Figure Description

[0011] Figure 1 This is a three-dimensional schematic diagram of a preferred embodiment of the present invention installed on a lawnmower blade holder.

[0012] Figure 2 This is an exploded perspective view of a preferred embodiment of the present invention.

[0013] Figure 3 This is a plan view of a preferred embodiment of the present invention.

[0014] Figure 4 This is a plan view of the other side of a preferred embodiment of the present invention.

[0015] Figure 5 This is a cross-sectional view of a preferred embodiment of the present invention.

[0016] Figure 6 This is a schematic diagram of the installation of the knife rope component according to a preferred embodiment of the present invention.

[0017] Figure 7 This is a schematic diagram of the disassembly and assembly of the knife rope component according to a preferred embodiment of the present invention.

[0018] Figure 8 A 3D view of an existing lawnmower assembly. Detailed Implementation

[0019] Please refer to Figure 1 and Figure 2 The present invention provides a preferred embodiment of the lawn mowing blade assembly installed on a handheld lawn mower. The handheld lawn mower includes a control lever 50 for the user to hold and operate, a blade holder 51 disposed at the end of the control lever 50, and a power shaft 52 disposed on the blade holder 51 and driven by a drive device. The lawn mowing blade assembly is mounted on the power shaft 52 and can be driven by the drive device to rotate at high speed.

[0020] Please refer to Figure 1 and Figure 2 The lawnmower assembly includes a blade 10, a disc base 20 located on one side of the blade 10, and two blade ropes 30 sandwiched between the disc base 20 and the blade 10.

[0021] Please refer to Figures 1 to 4 The blade 10 has two cutting edges 12, two long edges 13, two recessed recesses 14, and a blade mounting hole 15. The blade 10 is an elongated metal plate. The cutting edges 12 are located at opposite ends of the blade 10. Each cutting edge 12 is inclined and has multiple stepped toothed blades 123. Each cutting edge 12 is connected to a long edge 13 and a recessed recess 14 on opposite sides. The two long edges 13 are parallel to each other, and each recessed recess 14 gradually moves away from the corresponding cutting edge 12 and connects to the other long edge 13. Therefore, the vertical distance L2 between one end of each recessed recess 14 facing the corresponding cutting edge 12 and the opposite long edge 13 is less than the vertical distance L1 between the two long edges 13. The blade mounting hole 15 is formed in the middle section of the blade 10. Furthermore, each cutting edge 12 is inclined toward the corresponding long side 13 by the corresponding recess 14, and the multiple stepped toothed blades 123 face the corresponding long side 13, and a stepped recess 124 is formed between two adjacent toothed blades 123, so that the stepped toothed blades 123 can prevent the grass vines from getting tangled.

[0022] Please refer to Figures 2 to 4 , Figure 6 ,and Figure 7 The disc base 20 is a circular plate with a diameter D greater than the vertical distance L1 between the two long sides 13 of the blade plate 10. The disc base 20 includes a disc base mounting hole 21, two through holes 22, and two expansion grooves 23. The disc base mounting hole 21 is located in the center of the disc base 20 and is located at the axial position, and is aligned with the blade plate mounting hole 15. The two through holes 22 are located on the radially opposite sides of the disc base mounting hole 21 and are elongated. The two expansion grooves 23 are recessed on the side of the disc base 20 away from the blade plate 10 and are respectively connected to the two through holes 22. The two expansion grooves 23 are respectively facing the two cutting edges 12 of the blade plate 10.

[0023] Please refer to Figure 2 , Figure 3 , Figure 5 ,and Figure 6 The two blade cords 30 are detachably disposed between the blade plate 10 and the disc base 20, and are respectively locked in the two through holes 22 of the disc base 20. Each blade cord 30 includes a cord 32 and a fixing block 31 attached to the end of the cord 32. The cord 32 has a strong and tough wire, which can be a metal wire or a metal filament, in its core and is covered with a plastic coating layer. The plastic coating layer is cut with sharp edges according to the molding specifications. The size of the fixing block 31 is slightly smaller than the corresponding through hole 22, and can be locked in the corresponding through hole 22. Each fixing block 31 is generally rectangular. The cord 32 of each blade cord 30 extends away from the corresponding expansion groove 23 and extends out of the disc base 20 and is located on the side close to the corresponding relief recess 14. Each relief recess 14 is concave arc-shaped, which can prevent single-point wear of the blade cord 30 when the grass cutting blade assembly rotates at high speed.

[0024] Please refer to Figure 1 , Figure 2 ,and Figure 4 The drive shaft 52 passes through the blade mounting hole 15 and the disc mounting hole 21, and is screwed into a nut 53, thereby locking the lawn mower assembly to the drive shaft 52.

[0025] For further information, please refer to [link / reference]. Figure 2 and Figure 3The vertical distance L2 between one end of each recess 14 facing the corresponding cutting edge 12 and the opposite long side 13 is 0.5 to 0.8 times, preferably 0.6 to 0.75 times, the vertical distance L1 between the two long sides 13. The vertical distance L3 between one end of each recess 14 facing the corresponding cutting edge 12 and the end away from the corresponding cutting edge 12 along the length direction of the blade plate 10 is between 0.4 and 1 times, preferably greater than or equal to 0.5 to 0.8 times, the vertical distance L4 between one end of each recess 14 facing the corresponding cutting edge 12 and the center of the blade plate mounting hole 15 of the blade plate 10 along the length direction of the blade plate 10.

[0026] Please refer to Figure 2 , Figures 4 to 6 Furthermore, the disc base 20 has a recessed groove 24 on the side facing the blade plate 10. Two limiting blocks 245 are formed on opposite sides of the groove 24. The blade plate 10 is embedded in the groove 24, with its two long sides 13 facing the two limiting blocks 245, thus restricting the installation position of the blade plate 10 and allowing the disc base 20 to be fitted and attached to the blade plate 10 with the groove 24. Further details can be found in the reference section. Figure 2 , Figure 4 , Figure 6 ,and Figure 7 The groove 24 has two recessed channels 26 on its bottom surface. The two channels 26 are located on the radially opposite sides of the mounting hole 21 of the disc base and are connected to the two through holes 22. Each channel 26 extends away from the corresponding expansion groove 23. The opposite sides of each channel 26 form an arc-shaped corner 261 with the outer edge of the disc base 20. The rope 32 of each blade rope 30 can pass through the corresponding channel 26 and exit the disc base. Since the opposite sides of each channel 26 form an arc-shaped corner 261 with the outer edge of the disc base 20, the high-speed rotation of the grass cutting blade assembly can guide and support the blade rope 30 to prevent the rope 32 from breaking or wearing.

[0027] Please refer to Figure 1 and Figure 5 The disc base 20 has an annular protective wall 215 protruding from the side opposite to the blade plate 10, which surrounds the mounting hole 21 of the disc base. A groove with an inner diameter larger than the mounting hole 21 is formed within the protective wall 215. The end of the power shaft 52 and the nut 53 can be located within the protective wall 215 and protected by the protective wall 215.

[0028] Please refer to Figure 1 , Figure 2 , Figure 4 ,and Figure 5During installation, the blade plate 10 is fitted into the disc base 20 with the groove 24, and the two blade ropes 30 are respectively inserted into the two through holes 22 of the disc base 20, so that the ropes 32 of the blade ropes 30 pass through the corresponding grooves 26 and exit the disc base 20. The fixing blocks 31 of the blade ropes 30 are fitted into the corresponding through holes 22. The blade plate 10 and the disc base 20 are connected to the drive shaft 52 of the lawnmower with the blade mounting holes 15 and the disc base mounting holes 21, and then locked to the drive shaft 52 with nuts 53.

[0029] When the lawnmower is mowing, the rigid metal blades 10 can cut off thicker weeds or plants, ensuring the lawnmower's cutting ability and efficiency. For thinner weeds or weeds near walls or rocks, the blade rope 30 can be used to cut them, effectively preventing the blades 10 from wearing down, deforming, or breaking due to hitting walls or rocks, thus improving the flexibility and convenience of mowing. Since the blade rope 30 is installed in a replaceable manner on the disc base, it can be directly removed and replaced when any of the ropes 32 of the blade rope 30 breaks or when the blade rope 30 is not in use, which is quite convenient and practical. Because the disc base 20 has an annular guardrail 215, the fixing nut 53 can be located inside the guardrail 215, protecting the nut 53 from loosening or wearing out due to collision with foreign objects or weeds during mowing, thus improving the safety and durability of the lawnmower blade assembly during installation and use.

[0030] Please refer to Figure 3 and Figure 4 Because the blade 10 has two recessed areas 14, when the lawnmower assembly of this invention is driven to rotate at high speed by the drive device, the blade cord 30 located between the blade 10 and the disc base 20 is less likely to directly collide with the edge of the blade 10, thus making the blade cord 30 less prone to damage and extending its service life. Please refer to... Figure 6 and Figure 7 Since the side of the base 20 away from the blade plate 10 is recessed with two expansion grooves 23 that are respectively connected to the two through holes 22, the expansion grooves 23 can increase the space for the fixing block 31 to move during the disassembly and assembly of the knife rope component 30. This allows the user to more easily insert the knife rope component 30 from the side of the base 20 away from the blade plate 10 and snap the fixing block 31 into the corresponding through hole 22, or remove the fixing block 31 from the through hole 22 to replace the knife rope component 30, thus improving the convenience of installation.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the content of the present utility model's technical solution shall still fall within the scope of the present utility model's technical solution.

Claims

1. A grass cutting knife assembly, characterised in that, Includes: A blade plate has two cutting edges, two long edges, two recessed recesses, and a blade plate mounting hole. The two cutting edges are located at opposite ends of the blade plate. Each cutting edge is inclined and has multiple stepped toothed blades. Each cutting edge is connected to a long edge and a recessed recess on opposite sides. Each cutting edge is inclined from the corresponding recessed recess toward the corresponding long edge. The multiple stepped toothed blades face the corresponding long edge. A stepped recess is formed between two adjacent toothed blades. Each recessed recess gradually moves away from the corresponding cutting edge from the opposite long edge and connects to the other long edge. The blade plate mounting hole is formed in the middle section of the blade plate. A tray base is located on one side of the blade plate and has a tray base mounting hole, two through holes, and two expansion slots. The tray base mounting hole is located in the center of the tray base and aligned with the blade plate mounting hole. The two through holes are located on opposite radial sides of the tray base mounting hole. The two expansion slots are recessed on the side of the tray base away from the blade plate and communicate with the two through holes. The two expansion slots face the two cutting edges of the blade plate. Two knife rope components are detachably disposed between the blade plate and the disc base, and are respectively engaged in the two through holes of the disc base. Each knife rope component includes a rope and a fixing block attached to the end of the rope and engaged in the corresponding through hole. The rope of each knife rope component extends away from the corresponding expansion groove and protrudes from the disc base, and is located on one side of the corresponding relief recess.

2. The grass cutting implement assembly of claim 1, wherein, The vertical distance between the end of each recess facing the corresponding cutting edge and the opposite long side is 0.5 to 0.8 times the vertical distance between the two long sides.

3. The grass cutting implement assembly of claim 2, wherein, Each recess is an inwardly concave arc. The vertical distance from one end of each recess toward the corresponding cutting edge to the end away from the corresponding cutting edge along the length of the blade is in the range of 0.4 to 1 times the vertical distance from one end of each recess toward the corresponding cutting edge to the center of the blade mounting hole along the length of the blade.

4. The grass cutting knife assembly of any one of claims 1 to 3, wherein, The disc base has a recessed groove on one side facing the blade, and two limiting blocks are formed on opposite sides of the groove; and The blade is embedded in the groove, and the two long sides of the blade face the two limiting blocks respectively.

5. The grass cutting knife assembly of claim 4, wherein, The bottom surface of the groove is recessed with two channels, which are respectively connected to the two through holes; and The ropes of each knife rope component can pass through the corresponding groove and exit the disc base.

6. The grass cutting knife assembly of claim 5, wherein, Each channel extends away from the corresponding expansion channel, and each channel forms an arc-shaped corner between its two sides and the outer edge of the base.

7. The grass cutting knife assembly of claim 6, wherein, The side of the disc base facing away from the blade has a protruding ring forming a protective barrier around the mounting hole of the disc base.

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