Blades and mowers

Abstract

The present invention provides a blade and a lawn mower. The blade includes a middle portion arranged in a flat plate shape and ends arranged on both sides of the middle portion, the ends are provided with cutting edges, the ends include a first end and a second end, the second end is located between the middle portion and the first end, and connects the middle portion and the first end, and in the longitudinal direction of the middle portion, the ratio of the length of the first end to the length of the blade is between 0.045 and 0.09. Compared with the prior art, the blade of the present invention can not only fully break up the grass leaves after cutting to achieve the best grass breaking effect, but also has a simple structure and low cost.

Description

Technical Field

[0001] The invention relates to a blade and a lawn mower with the blade, belonging to the field of garden tools. Background Art

[0002] At present, there are two types of lawn mowers on the market: lawn mowers with grass bags and lawn mowers without grass bags. Lawn mowers without grass bags are also called grass choppers. Compared with lawn mowers, grass choppers do not have grass bags. Grass clippings are distributed on the lawn after cutting. If the grass clippings are too large or gathered into clumps, they will cover the lawn, causing poor growth or death of the lawn, affecting the appearance.

[0003] At present, in order to improve the grass cutting performance, lawn mowers on the market are designed with blades of various shapes and types, such as Honda's double-layer blades. However, this type of blade has a complex structure, large size, and high cost. In addition, due to its heavy weight, it has high power requirements for the lawn mower. If used on a low-power lawn mower (such as a lawn mower using a lithium battery), the load will be very large, resulting in fast power consumption and low mowing efficiency.

[0004] In view of this, it is indeed necessary to improve the existing blade to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a blade which has good grass-chopping performance even on a low-power lawn mower, and has a simple structure and low cost.

[0006] To achieve the above-mentioned purpose, the present invention provides a blade, including a middle portion arranged in a flat plate shape and end portions arranged on both sides of the middle portion, the end portions are provided with cutting edges, the end portions include a first end portion and a second end portion, the second end portion is located between the middle portion and the first end portion, and connects the middle portion and the first end portion, and in the longitudinal direction of the middle portion, the ratio of the length of the first end portion to the length of the blade is between 0.045 and 0.09.

[0007] As a further improvement of the present invention, in the longitudinal direction of the middle portion, the ratio of the length of the first end portion to the length of the second end portion is between 0.25 and 0.5, and the length of the middle portion is twice the length of the second end portion.

[0008] As a further improvement of the present invention, the ratio of the length of the first end portion to the length of the second end portion is 0.33.

[0009] As a further improvement of the present invention, in the longitudinal direction of the middle portion, the length of the blade is less than 43 cm.

[0010] As a further improvement of the present invention, the two end portions arranged on both sides of the middle portion are in a centrally symmetrical relationship; in the longitudinal direction of the middle portion, the first end portion and the second end portion are twisted relative to the middle portion, and the twisting direction of the first end portion is opposite to the twisting direction of the second end portion.

[0011] As a further improvement of the present invention, one side of the cutting edge of the end is defined as the front surface, and the other side opposite to the cutting edge is defined as the rear surface, the front surface of the first end is lower than the rear surface to form a first upward slope relative to the middle part; the front surface of the second end is higher than the rear surface to form a second downward slope relative to the middle part.

[0012] As a further improvement of the present invention, the first slope surface forms a first angle relative to the middle portion, the second slope surface forms a second angle relative to the middle portion, and the first angle is equal to the second angle.

[0013] As a further improvement of the present invention, the first angle and the second angle are both 8-15°.

[0014] To achieve the above-mentioned purpose, the present invention also provides a blade, including a middle portion arranged in a flat plate shape and end portions arranged on both sides of the middle portion, the end portions are provided with cutting edges, the end portions include a first end portion and a second end portion, the second end portion is located between the middle portion and the first end portion, and connects the middle portion and the first end portion, in the longitudinal direction of the middle portion, when the length of the blade is greater than 43 cm, the length of the first end portion is less than or equal to 30 mm.

[0015] Another object of the present invention is to provide a lawn mower having better grass chopping performance.

[0016] To achieve the above object, the present invention provides a lawn mower, comprising the above blade.

[0017] The beneficial effect of the present invention is that the blade of the present invention is provided with ends on both sides of the middle part, and the length of the first end in each end is set to be very small, preferably, the ratio of the length of the first end to the length of the blade is between 0.045 and 0.09, so that when cutting, even if it is used on a low-power lawn mower, the cut grass leaves can be fully broken up to achieve the best grass breaking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional view of the blade of the present invention.

[0019] Figure 2 yes Figure 1 Top view of the blade shown.

[0020] Figure 3 yes Figure 1 Side view of the blade shown.

[0021] Figure 4 yes Figure 1 Another angled side view of the blade shown. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] The present invention discloses a blade 100, which can be applied to a lawn mower, a step-type lawn mower or a garden tractor and similar vehicles (not shown) to cut grass blades and further cut the grass blades into debris. Taking a lawn mower as an example, since the blade 100 of the present invention can be applied to lawn mowers of any material and type, the specific structure of the lawn mower is not limited. The specific structure and use principle of the blade 100 will be described in detail below, but it should not be limited to this.

[0024] like Figures 1 to 4 As shown, the blade 100 includes a middle portion 10 arranged in a flat plate shape and end portions 20 arranged on both sides of the middle portion 10. The middle portion 10 is arranged in an elongated rectangular shape and is used to be installed on a lawn mower; the end portions 20 are provided with a cutting edge 201 for cutting grass blades and further cutting the grass blades into debris.

[0025] A mounting hole 101 is provided at the center of the middle portion 10, and the mounting hole 101 is used for a mounting shaft (not shown) of the lawn mower to pass through, so that the blade 100 is mounted on the lawn mower to achieve assembly of the blade 100. It can be understood that the mounting shaft can be fixedly connected to the blade 100 by bolts, or by other methods, which are not limited here.

[0026] Generally, the mounting shaft is coaxial with the motor of the lawn mower, so that when the motor rotates, the blade 100 can be driven to rotate to perform the mowing action. Of course, the mounting shaft can also be connected to the transmission mechanism of the lawn mower through gears or belts, so that when the transmission mechanism is started, the blade 100 can be driven to rotate by means of gears or belts to perform the mowing action.

[0027] The middle portion 10 is flat, and the two ends 20 on both sides of the middle portion 10 are in a centrally symmetrical relationship; that is, relative to the middle portion 10, the two ends 20 are inverted patterns of each other, that is, one of the ends 20 can overlap with the other end 20 after rotating 180 degrees in the horizontal direction. Such a configuration, on the one hand, can ensure that the blade 100 can rotate around the mounting axis on a substantially horizontal plane without bias; on the other hand, it is convenient to cut the grass blades multiple times to ensure that the grass blades are finally cut into fragments.

[0028] The end portion 20 and the middle portion 10 are integrally formed and made of the same material, and can form a complete blade 100. Since the structures and materials of the two end portions 20 are the same, the following description will take one of the end portions 20 as an example for detailed description, and the specific structure of the other end portion 20 will not be described again.

[0029] The end portion 20 includes a first end portion 21 and a second end portion 22, wherein the second end portion 22 is located between the middle portion 10 and the first end portion 21 and connects the middle portion 10 and the first end portion 21. In the longitudinal direction of the middle portion 10, a ratio of a length of the first end portion 21 to a length of the blade 100 is between 0.045 and 0.09.

[0030] like Figure 2 As shown, in the longitudinal direction of the middle portion 10, the length of the middle portion 10 is defined as A, the length of the first end portion 21 is defined as B, and the length of the second end portion 22 is defined as C. When the overall length of the blade 100 is less than 43 cm (about 17 inches), the ratio of the length B of the first end portion 21 to the length C of the second end portion 22 is between 0.25 and 0.5, preferably 0.33; the length A of the middle portion 10 is approximately twice the length C of the second end portion 22. When the overall length of the blade 100 is greater than 43 cm (about 17 inches), the length B of the first end portion 21 is less than or equal to 30 mm.

[0031] It can be seen that, whether for a blade 100 larger than 17 inches or a blade 100 smaller than 17 inches, as long as the length B of the first end portion 21 is controlled to have a ratio to the overall length of the blade 100 between 0.045 and 0.09, the grass-chopping effect is optimal.

[0032] For example: when the blade 100 is less than 17 inches, the length A of the middle portion 10 can be set to 166.46 mm, the length C of the second end portion 22 can be set to 76.22 mm, and the length B of the first end portion 21 can be set to 24.63 mm. At this time, the ratio of the length B of the first end portion 21 to the overall length of the blade 100 is approximately 0.0669 (i.e., 24.63 / (166.46+76.22*2+24.63*2)), the ratio of the length B of the first end portion 21 to the length C of the second end portion 22 is 0.323, and the length A of the middle portion 10 is approximately twice the length C of the second end portion 22, which meets the above requirements.

[0033] like Figure 1 and Figure 3 As shown, in the longitudinal direction of the middle portion 10, the first end portion 21 and the second end portion 22 are both twisted relative to the middle portion 10, and the twisting direction of the first end portion 21 is opposite to the twisting direction of the second end portion 22. Specifically, one side of the cutting edge 201 of the end portion 20 is defined as the front surface a, and the other side opposite to the cutting edge 201 is defined as the rear surface b, the front surface a of the first end portion 21 is lower than the rear surface b, so that the first end portion 21 forms an upward first slope 211 relative to the middle portion 10; the front surface a of the second end portion 22 is higher than the rear surface b, so that the second end portion 22 forms a downward second slope 221 relative to the middle portion 10. The cutting edge 201 of the end portion 20 constitutes the blade 100, and the front surfaces a of the first end portion 21 and the second end portion 22 are both provided with blades, and the blades are located on the side facing the grass blades for cutting the grass blades.

[0034] like Figure 4 As shown, the first slope 211 forms a first angle c with respect to the middle portion 10, and the second slope 221 forms a second angle d with respect to the middle portion 10, and the first angle c is equal to the second angle d. Preferably, the first angle c and the second angle d are both 8-15°, preferably 11°.

[0035] by Figure 1 Taking the right end 20 as an example, when the blade 100 is used to cut grass blades, the first slope 211 of the first end 21 facing the grass blade is an upslope surface, so after the grass blades are cut by the first end 21, the cut grass blades are longer and flow in the upslope direction with the airflow; when the grass blades touch the bottom shell of the lawn mower, they change direction and flow downward. Figure 1The left end 20 will rotate to complete the secondary cutting of the grass blades and the secondary rise with the airflow; through such continuous cycles, the grass blades can be cut into debris. It can be understood that: since the cutting edge 201 of the second end 22 is higher, and the grass blades cut by the first end 21 flow upward with the airflow, when the second end 22 of the other end 20 rotates closer, the grass blades will be cut twice to cut into smaller grass clippings.

[0036] It should be noted that: because the second slope 221 of the second end 22 is a downward slope, the air will flow downward, and the first slope 211 of the first end 21 is an upward slope, the air will flow upward, so that a high-pressure area will be formed in the upper rear part of the first end 21, and a low-pressure area will be formed in the upper rear part of the second end 22. Therefore, the cut grass clippings can not only flow along the upper and lower circulating airflows, but also flow along the circulating airflow biased to the left. Furthermore, the longer grass blades cut by the first end 21 will follow the direction of the airflow and flow to the second end 22 for secondary cutting.

[0037] It can be seen that in order to ensure that the grass blades are fully cut, the length B of the first end portion 21 must be sufficiently smaller than the length C of the second end portion 22. At this time, the grass chopping effect of the blade 100 is optimal. In the prior art, the length of grass clippings after cutting is generally 5-7 cm, while after cutting with the blade 100 of the present invention, the length of grass clippings obtained is 2-3 cm, which can achieve the best grass chopping effect without causing adverse effects on the lawn.

[0038] In summary, the blade 100 of the present invention respectively sets the end parts 20 on both sides of the middle part 10, and sets the length of the first end part 21 in each end part 20 to be very small, preferably, the ratio of the length of the first end part 21 to the overall length of the blade 100 is between 0.045 and 0.09, so that when cutting, even if it is used in a low-power lawn mower, the cut grass leaves can be fully broken up to achieve the best grass breaking effect. At the same time, the blade 100 of the present invention has a simple structure and low cost.

[0039] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A blade, comprising a middle portion arranged in a flat plate shape and end portions arranged on both sides of the middle portion, wherein the end portions are provided with cutting edges, Features: The end portion includes a first end portion and a second end portion, the second end portion is located between the middle portion and the first end portion, and connects the middle portion and the first end portion, and in the longitudinal direction of the middle portion, the ratio of the length of the first end portion to the length of the blade is between 0.045 and 0.09; the cutting edge side of the end portion is defined as a front surface, and the other side opposite to the cutting edge is defined as a rear surface, the front surface of the first end portion is lower than the rear surface to form an upward first slope surface relative to the middle portion, the front surface of the second end portion is higher than the rear surface to form a downward second slope surface relative to the middle portion, the first slope surface forms a first angle relative to the middle portion, the second slope surface forms a second angle relative to the middle portion, the first angle is equal to the second angle and both are 8-15°.

2. The blade according to claim 1, Features: In the longitudinal direction of the middle portion, a ratio of the length of the first end portion to the length of the second end portion is between 0.25 and 0.5, and the length of the middle portion is twice the length of the second end portion.

3. The blade according to claim 2, Features: A ratio of the length of the first end portion to the length of the second end portion is 0.

33.

4. The blade according to claim 2, Features: In the longitudinal direction of the middle portion, the length of the blade is less than 43 cm.

5. The blade according to claim 1, Features: The two ends arranged on both sides of the middle part are in a centrally symmetrical relationship; in the longitudinal direction of the middle part, the first end and the second end are twisted relative to the middle part, and the twisting direction of the first end is opposite to the twisting direction of the second end.

6. A blade comprising a middle portion arranged in a flat plate shape and end portions arranged on both sides of the middle portion, wherein the end portions are provided with cutting edges, Features: The end portion includes a first end portion and a second end portion, the second end portion is located between the middle portion and the first end portion, and connects the middle portion and the first end portion, and in the longitudinal direction of the middle portion, when the length of the blade is greater than 43 cm, the length of the first end portion is less than or equal to 30 mm; the cutting edge side of the end portion is defined as a front surface, and the other side opposite to the cutting edge is defined as a rear surface, the front surface of the first end portion is lower than the rear surface to form an upward first slope surface relative to the middle portion, the front surface of the second end portion is higher than the rear surface to form a downward second slope surface relative to the middle portion, the first slope surface forms a first angle relative to the middle portion, the second slope surface forms a second angle relative to the middle portion, the first angle is equal to the second angle and both are 8-15°.

7. A lawn mower, Features: The invention comprises the blade according to any one of claims 1 to 6.

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