Lawn mower

Abstract

The present invention relates to a lawn mower, which belongs to a garden tool, and comprises a frame, a walking structure arranged at the bottom of the frame, and a cutting assembly arranged at the bottom of the frame, wherein the cutting assembly comprises a cutter frame, at least two cutter discs installed on the cutter frame, a driving member arranged on the cutter frame for driving the cutter discs to rotate, and a grass guide member arranged between two adjacent cutter discs and used to guide plants located between the two adjacent cutter discs to the cutting space of the cutter discs when the lawn mower is moving. The lawn mower is provided with a grass guide member between two adjacent cutter discs, so that when the lawn mower is moving, the grass guide member guides plants located between the two adjacent cutter discs to the cutting space of the cutter discs, thereby avoiding the cutting blind area of ​​the lawn mower (the cutting blind area is located between the two adjacent cutter discs), thereby improving the single cutting quality.

Description

Technical Field

[0001] The invention relates to a lawn mower, belonging to gardening tools. Background Art

[0002] A lawn mower is a mechanical tool used to trim lawns, vegetation, etc. It usually includes a frame, a walking structure arranged at the bottom of the frame, and a cutting component arranged at the bottom of the frame. Figure 1 The cutting assembly usually includes a cutter disc frame 20, a cutter disc 10 mounted on the cutter disc frame 20, and a driving member (not shown) arranged on the cutter disc frame 20 for driving the cutter disc 10 to rotate. The lawn mower drives the cutter disc 10 to move by the driving member, so as to trim the lawn and vegetation while the lawn mower is moving, thereby saving the time of the weeding operation. In order to improve the weeding efficiency, a plurality of cutter discs 10 are usually installed on the cutter disc frame 20. However, the existing lawn mowers usually have the following problems: due to the presence of a gap area M between two adjacent cutter discs 10, during the process of the lawn mower moving and mowing, the plants (such as grass) located in the gap area cannot be cut, and multiple cuttings are required, which reduces the single cutting quality of the lawn mower. Summary of the invention

[0003] The object of the present invention is to provide a lawn mower which can improve the single cutting quality.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a lawn mower, comprising a frame, a walking structure arranged at the bottom of the frame, and a cutting assembly arranged at the bottom of the frame, wherein the cutting assembly comprises a cutter disc frame, at least two cutter discs installed on the cutter disc frame, a driving member arranged on the cutter disc frame for driving the cutter discs to rotate, and a grass guide member arranged between two adjacent cutter discs and used to guide plants located between the two adjacent cutter discs into the cutting space of the cutter discs when the lawn mower is moving.

[0005] In one embodiment, the grass guide member has a guide surface; the guide surface extends along the travel direction of the lawn mower, and the guide surface is a straight surface or an arc surface or a combination of a straight surface and an arc surface.

[0006] In one embodiment, the guide surface has a side end point, and the side end point is located at the widest part of the grass guide piece; in the opposite direction of the lawn mower's travel, the orthographic projection of the side end point falls within the cutter disc.

[0007] In one embodiment, a first symmetry axis perpendicular to the travel direction of the lawn mower is set on the cutter disc frame; in the travel direction of the lawn mower, the cutter disc has a frontmost cutting point; and a straight-line distance between the front end point of the guide surface and the first symmetry axis is greater than a straight-line distance between the frontmost cutting point and the first symmetry axis.

[0008] In one of the embodiments, the grass guide member includes an assembly portion docked with the blade holder and a bottom portion disposed opposite to the assembly portion, and the bottom portion is in the form of an inverted cone.

[0009] In one of the embodiments, a height difference between the bottom of the grass guide and the lower surface of the blade disc is H1, and the height difference H1 is greater than or equal to 0.

[0010] In one embodiment, the height difference H1 is smaller than the minimum cutting height H2 of the cutter disc.

[0011] In one of the embodiments, the cutter discs are mounted side by side on the cutter disc frame.

[0012] In one of the embodiments, the grass guide member is a central axis symmetrical structure, and the central axis of the grass guide member is parallel to the forward direction of the lawn mower.

[0013] In one of the embodiments, the grass guide is symmetrically arranged on the symmetry axes of the two adjacent blade discs.

[0014] In one of the embodiments, two grass guides are disposed back to back between two adjacent blade discs in a direction perpendicular to the travel direction of the lawn mower.

[0015] The beneficial effect of the present invention is that the lawn mower of the present invention arranges a grass guide between two adjacent blade discs so that when the lawn mower is moving, the grass guide will guide the plants located between the two adjacent blade discs into the cutting space of the blade discs, thereby avoiding the cutting blind area of ​​the lawn mower (the cutting blind area is located between the two adjacent blade discs) and improving the quality of a single cutting.

[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the assembly of a cutter disc and a cutter disc frame in the prior art;

[0018] Figure 2 is a perspective schematic diagram of a grass guide member shown in an embodiment of the present invention;

[0019] Figure 3 for Figure 2 A top view of the grass guide shown;

[0020] Figure 4 for Figure 2 A front view of the grass guide shown;

[0021] Figure 5 for Figure 2A left side view of the grass guide shown;

[0022] Figure 6 A schematic diagram of a grass guide, a blade disc and a blade disc frame shown in the first embodiment of the present invention;

[0023] Figure 7 for Figure 6 Section view in the AA direction;

[0024] Figure 8 for Figure 7 Enlarged view of the middle circled part;

[0025] Fig. 9 A schematic diagram of a grass guide, a blade disc and a blade disc frame shown in the second embodiment of the present invention;

[0026] Fig.10 A simplified diagram of a grass guide, a blade disc and a blade disc frame shown in the third embodiment of the present invention;

[0027] Fig.11 This is a simplified diagram of the grass guide, the blade disc and the blade disc frame shown in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] The lawn mower shown in a preferred embodiment of the present invention includes a frame (not shown), an engine (not shown) arranged in the frame, a walking structure (not shown) arranged at the bottom of the frame, and a cutting assembly arranged at the bottom of the frame. Figure 6The cutting assembly 30 includes a cutter disc frame 3, two cutter discs 2 installed side by side on the cutter disc frame 3, a grass guide 1 arranged between the two cutter discs 2, and a driving member (not shown) arranged on the cutter disc frame 3 for driving the cutter discs 2 to rotate. The grass guide is used to guide the plants located between the two cutter discs 2 to the cutting space of the cutter disc 2 when the lawn mower is moving. It should be noted that the cutting space of the cutter disc 2 refers to the space that the cutter disc 2 can reach and complete the cutting task during the movement. The lawn mower is provided with a grass guide 1 between two adjacent cutter discs 2, so that when the lawn mower is moving, the grass guide 1 guides the plants located between the two adjacent cutter discs 2 to the cutting space of the cutter disc 2, thereby avoiding the cutting blind area of ​​the lawn mower (the cutting blind area is located between the two adjacent cutter discs 2) and improving the quality of a single cut. In the embodiments given herein, only two blade discs 2 are arranged on the blade disc frame 3. In other embodiments, multiple (3 or more) blade discs 2 may be arranged side by side on the blade disc frame 3, and a grass guide 1 is arranged between each two adjacent blade discs 2. Of course, there may be one or more blade discs 2, and its grass guide 1 may also be arranged on the outermost side of the blade disc 2 (in the longitudinal direction of the blade disc frame 3). For example, when there is one blade disc 2, two grass guides 1 are arranged in the longitudinal direction of the blade disc frame 3 on the side of the forward walking direction, and the blade disc 2 is located between the grass guides 1. When the grass guide 1 is arranged on the outermost side of the blade disc 2 (in the longitudinal direction of the blade disc frame 3), the plants outside the blade disc 2 can be guided into the cutting space of the blade disc 2, thereby improving the work efficiency. In this embodiment, the lawn mower is an intelligent lawn mower. In other embodiments, it may also be a hand-push lawn mower. In this embodiment, the grass guide 1 is arranged on the blade disc frame 3 (its structure will be described in detail later). In other embodiments, the grass guide 1 can be set as a separate component, fixed on the frame and located on one side of the blade disc 2 to guide the plants in the forward direction of the blade disc 2 into the cutting space of the blade disc 2.

[0030] See also Figure 2 The grass guide 1 includes a diverter 11 for diverting plants on the side of the blade disc (not shown) to the cutting space of the blade disc when the lawn mower is moving. The diverter 11 has a guide surface 111, and the guide surface 111 extends along the moving direction of the lawn mower. With the moving direction of the lawn mower as a reference direction, the straight-line distance between the guide surface 111 and the central axis of the lawn mower in the moving direction adjacent to the guide surface 111 gradually shortens (please refer to Figure 6 or Fig. 9 ), such as: please refer to Figure 6The guide surface 111 has a front end point 111a and a rear end point 111b. The front end point 111a of the grass guide 1 is the part of the grass guide 1 that first contacts the plant when the lawn mower is moving. When the grass guide 1 is arranged on one side of the blade 2, the front end point 111a is arranged away from the blade relative to the rear end point 111b, and relative to the central axis of the lawn mower's moving direction, the straight-line distance L1 between the front end point 111a and the central axis is greater than the straight-line distance L3 between the rear end point 111b and the central axis. The guide surface 111 can be a straight surface or an arc surface or a combination of a straight surface and an arc surface. In this embodiment ( Figures 2 to 5 ), the guide surface 111 is a streamlined curved surface. In other embodiments, the guide surface 111 can be a straight surface (such as Figure 6 ), or formed by two straight surfaces connected; or formed by a straight surface and an inclined surface connected (such as Fig. 9 ).

[0031] It should be noted that, in this embodiment, the grass guide 1 has two guide surfaces 111 disposed opposite to each other, so that in a lawn mower having multiple blade discs, the grass guide 1 can guide plants to the cutting space of two adjacent blade discs. The grass guide 1 is a block structure, and the grass guide 1 is a central axis symmetrical structure. Through its symmetrical structure, first, it is convenient for manufacturing, and second, since the blade discs on the lawn mowers in embodiments 1 to 4 are all symmetrically arranged, this design is also a structural design corresponding to the blade disc. Of course, in a specific actual design, the grass guide 1 may not be symmetrically arranged, and the structures and sizes of the two guide surfaces 111 may be different. In other embodiments, the grass guide 1 may be a single sheet, or a frame formed by two sheet bodies, or a hollow structure formed by two sheet bodies and a supporting structure. However, compared with other embodiments, the block structure adopted by the grass guide 1 in this embodiment has better strength, is more conducive to the diversion of plants, and is also more convenient in manufacturing. Furthermore, in other embodiments, the grass guide 1 may have only one guide surface 111 .

[0032] The grass guide 1 of this embodiment further comprises an assembly portion 12 docked with a blade holder (not shown) and a bottom portion 13 disposed opposite to the assembly portion 12, and the bottom portion 13 is in the form of an inverted cone. By configuring the bottom portion 13 to be in the form of an inverted cone, the grass pressing area of ​​the grass guide 1 is reduced when the lawn mower is in use, which is more helpful to improve the quality of a single mowing.

[0033] The grass guide 1 of this embodiment also includes a tail portion 14 extending backward from the diverter portion 11; the width of the tail portion 14 gradually decreases from one end close to the diverter portion 11 to the end away from the diverter portion 11. This design can prevent interference between the tail portion 14 and the cutter disc. At the same time, it helps to extend the longitudinal length of the grass guide 1, increase the contact surface between the grass guide 1 and the cutter disc frame, and make the grass guide 1 and the cutter disc frame more firmly fixed. It should be noted that the contact surface between the grass guide 1 and the cutter disc frame is the assembly portion 12, and the assembly portion 12 and the bottom 13 both span the diverter portion 11 and the tail portion 14. In this embodiment, the grass guide 1 is fixed to the cutter disc frame by a fastener (not shown), and a fastening hole 15 is formed on the grass guide 1.

[0034] See also Figure 6 , Figure 6 The direction of arrow a is the direction of the lawn mower. Figure 2 The structure of the present invention is different in that the guide surface 111 of the grass guide 1 is a straight surface and the grass guide 1 is in a diamond shape. Figure 6 As the reference perspective, when the cutter disc assembly 30 is installed on the lawn mower, the direction indicated by the arrow a in the figure is the moving direction of the lawn mower, and the cutter disc frame 3 is set with a second symmetry axis x and a first symmetry axis y. The second symmetry axis x extends along the moving direction of the lawn mower and is parallel to the moving direction of the lawn mower; the first symmetry axis y is perpendicular to the moving direction of the lawn mower. The cutter disc frame 3 is symmetrically arranged along the first symmetry axis y and the second symmetry axis x. It should be noted here that if the cutting assembly 30 is taken as the main perspective, then Figure 6 The first symmetry axis y is the longitudinal direction of the cutter frame 3, and the second symmetry axis x is the transverse direction of the cutter frame 3. However, if the entire lawn mower is taken as the perspective, the first symmetry axis y belongs to the transverse direction of the lawn mower, and the second symmetry axis x belongs to the longitudinal direction of the lawn mower. In the first embodiment, in order to achieve the best diversion effect, the grass guide 1 is symmetrically arranged on the symmetry axis of the two cutter discs 2, and the symmetry axis is parallel to the travel direction of the lawn mower. It should be noted that in the present embodiment, since the cutter frame 3 is only provided with two cutter discs 2, the symmetry axis of the two cutter discs 2 is the second symmetry axis x. In other embodiments, when the cutter frame 3 is not limited to installing two, the grass guide 1 can be multiple, and a grass guide 1 of the first embodiment can be arranged between two adjacent cutter discs 2. At this time, the symmetry axis between the two adjacent cutter discs 2 may not be the second symmetry axis x. Indeed, if the adopted grass guide member 1 has only one guide surface 111, two grass guide members 1 can be arranged between two adjacent blade discs 2 to achieve bidirectional deflection in the same traveling direction.

[0035] In the direction of travel of the lawn mower, the cutter disc 2 has a front cutting point C, which is not a specific position on the cutter disc 2, but the frontmost position point on the cutter disc 2 in the spatial concept, such as Figure 6 In the figure, the direction of arrow a is the cutting direction (i.e., the direction of the mower's movement), and the frontmost point of the blade 2 is the front cutting point C. Theoretically, the front cutting point C is the position where the plant is first cut. In the direction of the mower's movement, the straight-line distance between the front end point 111a of the diverter 11 and the first symmetry axis y is greater than or equal to the straight-line distance between the front cutting point C and the first symmetry axis y. Figure 6 In the figure, D1 represents the linear distance between the front end point 111a of the diverter 11 and the first symmetry axis y, and D2 represents the linear distance between the front cutting point C and the first symmetry axis y. Since D1>D2, the grass guide 1 contacts the plant earlier than the blade 2 to improve the cutting quality. The grass guide 1 also has a side end point, which is located at the widest part of the grass guide 1. In this embodiment, the side end point is the rear end point 111b. In the direction of travel of the opposite mower, the positive projection of the side end point falls within the blade 2 to reduce the mowing blind area between the blade 2 and the grass guide 1 within the minimum range, further improving the cutting quality. Please refer to Figure 7 and Figure 8 The height difference between the bottom 13 of the grass guide 1 and the lower surface (unnumbered) of the blade disc 2 is H1, and the height difference H1 is greater than or equal to 0, which is conducive to smooth cutting. Optimally, the height difference H1 is less than or equal to the minimum cutting height H2 (not shown) of the blade disc 2, and the minimum cutting height H2 is the height of the blade disc 2 from the ground.

[0036] See also Fig. 9 , Fig. 9 The direction of arrow a is the moving direction of the lawn mower. The blade disc assembly 40 shown in the second embodiment of the present invention is similar in structure to the blade disc assembly of the first embodiment. The difference is that the structure of the grass guide 4 used in the second embodiment is slightly different from the structure of the grass guide in the first embodiment. In the second embodiment, each guide surface 411 of the grass guide 4 is formed by connecting a straight surface and a curved surface.

[0037] See also Fig.10The blade disc assembly 50 shown in the third embodiment of the present invention is similar in structure to the blade disc assembly of the first embodiment, except that in the third embodiment, two grass guides 5 are provided. In the process of cutting by the lawn mower, most lawn mowers can move forward and backward (arrow a in the figure indicates forward movement, and arrow b indicates backward movement) to improve work efficiency. Therefore, according to the mowing method of this lawn mower, two grass guides 1 can be provided between two adjacent blade discs 2. Specifically: in the direction of travel of the lawn mower, two grass guides 5 are provided back to back between two adjacent blade discs, that is, the two grass guides 5 between two adjacent blade discs are symmetrically arranged about the first symmetry axis y. In other embodiments, if the grass guide has only one guide surface, four grass guides can be provided between two adjacent blade discs, two of which form a group, and the guide surfaces of the two grass guides in each group are arranged back to back along the travel direction of the lawn mower. The arrangement of the two groups of grass guides can refer to the third embodiment.

[0038] See also Fig.11 The blade disc assembly 60 shown in the fourth embodiment of the present invention is similar in structure to the blade disc assembly of the third embodiment, except for the structure of the grass guide 6 used. The lawn mower in this embodiment can also move forward and backward (arrow a in the figure indicates forward movement, and arrow b indicates backward movement), and the structure of each grass guide 6 in the fourth embodiment is the same as that of the grass guide used in the second embodiment.

[0039] In the above embodiment, Fig.10 For example, the grass guide 5 is fixed to the cutter disc frame 3 by fasteners. Of course, other assembly methods may be used, such as welding, etc.; or, the grass guide 5 and the cutter disc frame 3 are designed as an integrated whole.

[0040] In other embodiments, two cutter discs 2 are arranged on the cutter disc holder 3, and the two cutter discs 2 are staggered relative to the first symmetry axis y (that is, the central axes of different cutter discs 2 on the first symmetry axis y do not overlap). In addition, the cutter disc holder 3 can also stagger multiple (3 or more) cutter discs 2. In actual implementation, the cutter discs 2 can be arranged in an isosceles triangle, in multiple rows side by side, in an arrow shape (V shape) or in a multi-arrow (W shape), etc. It should be noted that no matter how many cutter discs 2 are actually arranged, a grass guide 1 must be provided between every two adjacent cutter discs 2 in the direction of the second symmetry axis X.

[0041] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A lawn mower, comprising a frame, a walking structure arranged at the bottom of the frame, and a cutting assembly arranged at the bottom of the frame, wherein the cutting assembly comprises a cutter disc frame, at least two cutter discs mounted on the cutter disc frame, and a driving member arranged on the cutter disc frame for driving the cutter discs to rotate, characterized in that: The cutting assembly also includes a grass guide member arranged between two adjacent blade discs and used to guide plants located between the two adjacent blade discs to the cutting space of the blade discs when the lawn mower is moving; the grass guide member has a guide surface, and the guide surface has a side end point, and the side end point is located at the widest part of the grass guide member; in the opposite direction of movement of the lawn mower, the positive projection of the side end point falls within the blade disc, and the guide surface also has at least a front end point and a rear end point, and the straight-line distance L1 between the front end point and the central axis is greater than the straight-line distance L3 between the rear end point and the central axis, and the projection of the grass guide member and the blade disc perpendicular to the direction of movement of the lawn mower does not overlap.

2. The lawn mower according to claim 1, characterized in that The grass guide member has a guide surface; the guide surface extends along the travel direction of the lawn mower, and the guide surface is a straight surface or an arc surface or a combination of a straight surface and an arc surface.

3. The lawn mower according to claim 2, characterized in that A first symmetry axis perpendicular to the travel direction of the lawn mower is set on the cutter disc frame; in the travel direction of the lawn mower, the cutter disc has a frontmost cutting point; the straight-line distance between the front end point of the guide surface and the first symmetry axis is greater than the straight-line distance between the frontmost cutting point and the first symmetry axis.

4. The lawn mower according to claim 1, characterized in that The grass guide member comprises an assembly portion docking with the blade disc frame and a bottom portion arranged opposite to the assembly portion, wherein the bottom portion is in the form of an inverted cone.

5. The lawn mower according to claim 1, characterized in that A height difference between the bottom of the grass guide and the lower surface of the blade disc is H1, and the height difference H1 is greater than or equal to 0.

6. The lawn mower according to claim 5, characterized in that The height difference H1 is smaller than the minimum cutting height H2 of the cutter disc.

7. The lawn mower according to claim 1, characterized in that: The cutter discs are mounted side by side on the cutter disc frame.

8. The lawn mower according to any one of claims 1 to 7, characterized in that The grass guide member is a central axis symmetrical structure, and the central axis of the grass guide member is parallel to the forward direction of the lawn mower.

9. The lawn mower according to claim 8, characterized in that The grass guides are symmetrically arranged on the symmetry axes of the two adjacent blade discs.

10. The lawn mower according to claim 8, characterized in that Two grass guides are arranged back to back between two adjacent blade discs in a direction perpendicular to the travel direction of the lawn mower.

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