Grass cutting machine

Abstract

To provide a grass cutting machine with a novel structure having a wide range of work applications.SOLUTION: The grass cutting machine comprises: a frame 10; drive wheels 8 provided on the frame 10; and a rotary cutting blade 30 disposed on the frame 10 so as to rotate about a rotation axis L in conjunction with the drive wheels 8. The rotation axis L of the rotary cutting blade 30 is inclined with respect to the ground when viewed from a traveling direction T of the frame 10. The rotary cutting blade 30 is arranged around the rotation axis L such that the distance from the rotation axis L increases (the blade is further spaced from the rotation axis L) from a lower side (base end) toward an upper side (tip end) of the rotation axis L.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a grass cutter for cutting grass in homes, parks, etc. [Background technology]

[0002] This type of grass cutter is moved forward by human power or power, and the drive wheel is rolled on the ground to rotate the cutting blade and perform the grass cutting operation. The cutting blade is fixedly connected to the drive wheel by a bolt or the like, and rotates together with the drive wheel. This type of grass cutter clamps and cuts grass with a cutting blade that rotates together with the drive wheel (hereinafter also referred to as a rotating cutting blade) and a cutting blade that is fixed (stationary) to a frame or an operating rod (hereinafter also referred to as a fixed cutting blade). This type of grass cutter has a simple structure and is a lightweight, inexpensive product, as the cutting blade is attached directly to the drive wheel and rotated. Manual grass cutters in which the cutting blade is linked to the drive wheel are known from Patent Documents 1 and 2, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7296667 [Patent Document 2] Patent No. 6425781 Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Documents 1 and 2, manual grass cutters in which the blade is linked to the drive wheel are already on the market, but the blade is a vertically rotating reel type with a rotation axis parallel to the ground. With such a reel type rotary blade, the blade cuts the grass at the lowest point of rotation and returns from above, so when it comes to tall (long) grass, the blade knocks it down, making it difficult to cut, and so they are mainly used in places where short grass grows, such as lawns. Another disadvantage of the reel type rotary blade is that it has a complex shape and is difficult to maintain.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a grass cutter with a new structure that can be used in a wide range of tasks. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the grass cutter of the present invention basically comprises a frame, a drive wheel provided on the frame, and a rotary cutting blade arranged on the frame so as to rotate about a rotary shaft in conjunction with the drive wheel, and is a grass cutter that cuts grass with the rotary cutting blade rotating about the rotary shaft, wherein the rotary shaft is inclined with respect to the ground when viewed from the direction of travel of the frame, and the rotary cutting blade is arranged around the rotary shaft so that the distance between the rotary cutting blade and the rotary cutting blade increases as one moves from the lower side to the upper side of the rotary shaft.

[0007] In a preferred embodiment, the mower further comprises a fixed blade arranged on the frame so as to be in contact with the rotary blade, and the rotary blade and the fixed blade are rubbed against each other as the rotary blade rotates around the rotation axis, thereby clamping and cutting grass between the rotary blade and the fixed blade.

[0008] In another preferred embodiment, the drive wheel and the rotary cutting blade rotate integrally about the rotation shaft.

[0009] In another preferred embodiment, the rotary blade has a rotational diameter larger than a rotational diameter of the drive wheel.

[0010] In another preferred embodiment, the rotary cutting blade is arranged so that a lowermost portion of the rotary cutting blade is parallel to the ground when the rotary cutting blade rotates about the rotation axis.

[0011] In another preferred embodiment, the uppermost part of the rotary cutting blade is perpendicular to the ground when rotated about the rotation axis.

[0012] In another preferred embodiment, the rotation axis is inclined within a range of 0 degrees to 45 degrees with respect to a direction perpendicular to the direction of travel when viewed from above and below, so that the upper side of the rotation axis is located further forward in the direction of travel than the lower side.

[0013] In another preferred embodiment, the cutting blade further includes a pressing member for suppressing deformation of the rotary cutting blade.

[0014] In another preferred embodiment, the grass cutter further comprises an operating rod for moving the grass cutter to apply a rotational force to the drive wheel and the rotary cutting blade.

[0015] In another preferred embodiment, the cutting machine further includes a drive source for driving the drive wheel and the rotary cutting blade to rotate.

[0016] In another preferred embodiment, the mower further comprises a container for collecting grass cut by the rotary mower blade. Effect of the Invention

[0017] According to the present invention, by tilting the rotation axis of the rotary blade with respect to the ground when viewed from the traveling direction of the frame, the rotary blade is sent in one direction within the working range (the lowest part of the rotary blade), so the returning rotary blade does not get in the way when cutting tall (long) grass, and the grass is not knocked over by the returning rotary blade from above. Therefore, grass cutting work can be performed efficiently regardless of the length of the grass, and the range of applicable work can be expanded. [Brief description of the drawings]

[0018] [Figure 1] 1 is an overall perspective view showing a grass cutter according to an embodiment of the present invention; [Diagram 2] 1 is a left side view showing a main part of a grass cutter according to an embodiment of the present invention; [Diagram 3] 1 is a front view showing a main part of a grass cutter according to an embodiment of the present invention; [Figure 4] FIG. 4 is a front view of the device in FIG. 3 with the operating rod and container removed. [Diagram 5]Top view of Figure 4. [Figure 6] FIG. 6 is a top view of FIG. 5 with the connecting member with the pressing member removed. [Figure 7] 5 is a cross-sectional view taken along line AA in FIG. 4 . [Figure 8] FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4 . [Figure 9] A cross-sectional view taken along the line CC in FIG. 6 (the right end portion is an exploded cross-sectional view). [Figure 10] FIG. 13 is a top view showing the main part of a grass cutter according to another embodiment of the present invention (the inclination of the rotary cutting blade, etc. is changed). [Figure 11] FIG. 13 is a perspective view showing the main part of a grass cutter according to another embodiment of the present invention (in which the shape of the container is changed). [Figure 12] FIG. 11 is an overall perspective view (part 1) showing a grass cutter according to another embodiment (electric type) of the present invention. [Figure 13] FIG. 2 is a second overall front view showing a grass cutter according to another embodiment (electric type) of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, the description will be mainly based on a manual grass cutter 1. The concepts of position and direction such as front / back, left / right, up / down, etc. in this specification are assumed to be consistent with the concepts of position and direction such as front / back, left / right, up / down, etc. in the grass cutter 1 shown in FIG. 1, etc.

[0020] Fig. 1 is an overall perspective view showing the appearance of a grass mower 1 according to this embodiment. Fig. 2 and Fig. 3 are a left side view and a front view, respectively, showing the main parts of the grass mower 1 according to this embodiment.

[0021] As shown in the figure, the grass cutter 1 basically comprises a frame 10, drive wheels 8 provided on the left and right sides of the frame 10, a rotating cutting blade 30 supported on the frame 10 so as to rotate around a rotation axis L, a fixed cutting blade 40 supported on the frame 10 so as to be in contact with the rotating cutting blade 30 rotating around the rotation axis L, and an operating rod (also called a handle) 6 provided to extend diagonally upward from the frame 10.

[0022] In this embodiment, a drive wheel 8 and a rotary cutting blade 30 are rotatably attached to the left and right sides of the front of the frame 10, a fixed cutting blade 40 is fixedly attached to the center of the front of the frame 10, and an operating rod 6 is provided on the rear side of the frame 10 so as to extend upward and rearward.

[0023] 5 and 6, the frame 10 has a roughly T-shape in plan view (when viewed from above and below), and includes a support part 12 located at the front of the frame 10 and extending in the left-right direction (vehicle width direction), and a connecting part 16 extending rearward from the left-right center of the support part 12. A drive wheel 8 and a rotary cutting blade 30 are rotatably attached to both left and right ends of the support part 12, and a fixed cutting blade 40 is fixedly attached to the center of the support part 12. An operating rod 6 is connected to the connecting part 16 via a connecting member 17 provided near the rear end of the connecting part 16.

[0024] In this embodiment, the connecting member 17 has a cylindrical shape with a bottom, and its bottom plate portion 18 is fastened to (the upper surface of) the connecting portion 16 with a bolt 20 (via the fixed cutting blade 40) (see Figs. 5 and 7), and the lower end portion of the operating rod 6 is inserted into the cylindrical portion 19. This enables the operator to push the grass cutter 1 forward via the operating rod 6, cause the drive wheels 8 to roll on the ground and rotate the rotary cutting blade 30 (i.e., impart a rotational force to the drive wheels 8 and the rotary cutting blade 30), and perform grass cutting work.

[0025] In this embodiment, in order to mount the drive wheel 8 and the rotary cutting blade 30 (their rotation axis L) at an angle relative to the ground, as can be seen by referring to Figures 4, 9, etc. in addition to Figure 3, both left and right ends of the support portion 12 are bent upward to form an angle (approximately 45° in the illustrated example), and a through hole 15 is provided in the inclined portion 14 formed at that angle, for inserting a fastening bolt 22 for mounting.

[0026] In each of the inclined portions 14 formed on the left and right sides of the support portion 12, the drive wheel 8 is disposed on the outer surface side (lower surface side) of the inclined portion 14 with a washer 23 sandwiched therebetween, and the rotary cutting blade 30 is disposed on the inner surface side (upper surface side) of the inclined portion 14 with a washer 24 sandwiched therebetween. A bearing 25 is press-fitted into the through hole 15, and the drive wheel 8 and the rotary cutting blade 30 are rotatably attached to the outer and inner sides of the inclined portion 14 by a through hole 9 provided in the center of the drive wheel 8, an inner ring portion of the bearing 25 press-fitted into the through hole 15, and a fastening bolt 22 inserted into a through hole 31 provided in the center of the rotary cutting blade 30, and a nut 26 screwed onto the fastening bolt 22.

[0027] With this mounting configuration, the drive wheel 8 and the rotary cutting blade 30 are disposed and supported on the inclined portion 14 so as to rotate integrally (at the same rotation period or rotation speed) around the same rotation axis L (extending in a direction along the axis of the fastening bolt 22). As described above, the inclined portion 14 is bent and formed so as to be inclined with respect to the ground as viewed from the traveling direction T, so that the common rotation axis L of the drive wheel 8 and the rotary cutting blade 30, which extends in a direction approximately perpendicular to the inclined portion 14, is also inclined with respect to the ground as viewed from the traveling direction T. It is needless to say that the configuration for inclining the rotation axis L of the drive wheel 8 and the rotary cutting blade 30 with respect to the ground is not limited to the illustrated embodiment. Moreover, the inclined portion 14 and the rotation axis L do not necessarily have to be perpendicular.

[0028] The drive wheel 8 attached to the outer side of the inclined portion 14 contacts the ground with its rotation axis L inclined relative to the ground as described above, so that its outer peripheral surface (contact surface) 8A is formed in an umbrella shape (tapered at approximately 45° in the illustrated example) when viewed from the direction of travel T so that it can contact the ground approximately parallel to the ground.

[0029] In addition, the rotary cutting blade 30 attached to the inner surface of the inclined portion 14 has a fixed portion 32 placed on the inclined portion 14 and a plurality of blade members 34 (six in the illustrated example) extending radially from the periphery of the fixed portion 32, and the through hole 31 for inserting the fastening bolt 22 for mounting is provided in the fixed portion 32.

[0030] In this embodiment, each blade member 34 extending from the periphery of the fixed portion 32 is angled (about 45° in the illustrated example) so as to be inclined with respect to the rotation axis L so as to widen toward the tip side. In other words, each blade member 34 is disposed at approximately equal intervals around the rotation axis L so as to move away from the fixed portion 32 and away from the rotation axis L, or so as to widen the distance between the blade members 34 and the rotation axis L from the base side (lower side) of the rotation axis L to the tip side (upper side).

[0031] In the illustrated embodiment, the rotation axis L of the rotary cutting blade 30 is inclined at an angle of approximately 45° with respect to the ground, and each blade member 34 of the rotary cutting blade 30 is inclined at an angle of approximately 45° with respect to the rotation axis L. Therefore, when (each blade member 34 of) the rotary cutting blade 30 rotates around the rotation axis L, each blade member 34 of the rotary cutting blade 30 is approximately parallel to the ground at the bottom of the rotary cutting blade 30, and each blade member 34 of the rotary cutting blade 30 is approximately perpendicular to the ground at the top of the rotary cutting blade 30 (see FIG. 4, etc.).

[0032] As described above, when (each of the blade members 34 of) the rotary cutting blade 30 rotates, the blade members 34 of the rotary cutting blade 30 become substantially parallel to the ground at the bottom of the rotary cutting blade 30, so that the height of the grass can be made substantially constant. Also, the blade members 34 of the rotary cutting blade 30 become substantially perpendicular to the ground at the top of the rotary cutting blade 30, so that the width of the grass cutter 1 can be minimized.

[0033] In this embodiment, the connecting member 17 connected to the operating rod 6 is offset rearward from the line segment (extending in the left-right direction) connecting the centers of the left and right rotary cutting blades 30 (see Figs. 5, 6, etc.), and each blade member 34 of the left and right rotary cutting blades 30 extends to the vicinity of the left-right center of the support portion 12 of the frame 10 at the lowest part of the rotary cutting blade 30. Therefore, grass cutting work can be performed over almost the entire area between the left and right driving wheels 8 (working range S (see Fig. 4)). In this embodiment, the rotational diameter (= outer diameter around the rotation axis L) φa of (each blade member 34 of) the rotary cutting blade 30 is larger than the rotational diameter (= outer diameter around the rotation axis L) φb of the driving wheel 8 (see Fig. 4). Therefore, the circumferential speed of (each blade member 34 of) the rotary cutting blade 30 becomes faster than the circumferential speed of the driving wheel 8, and the workability of the grass cutting work can be improved.

[0034] On the other hand, the fixed cutting blade 40 provided in the center of the support portion 12 (excluding the left and right inclined portions 14) so ​​as to contact the rotary cutting blade 30 has a sharp cutting edge portion 41 formed at its front end portion. In the illustrated embodiment, the fixed cutting blade 40 has substantially the same shape as the frame 10 in a plan view (when viewed from the top and bottom direction) (i.e., a substantially T-shaped shape), and is placed on the frame 10 so that its front end portion (cutting edge portion 41) protrudes slightly forward from the front end portion of the frame 10 (support portion 12), and is fastened and fixed to the frame 10 (support portion 12) by two bolts 42 provided at the left and right positions (see Figs. 7 and 9). In the illustrated embodiment, the inclined portions 14 or the center position of the rotary cutting blade 30 are offset slightly forward from the center position of the support portion 12 in the front-rear direction so that the lowest portion of the rotary cutting blade 30 and the front end portion (cutting edge portion 41) of the fixed cutting blade 40 are substantially aligned in the front-rear direction (see Figs. 7 and 8).

[0035] In the illustrated embodiment, the connecting member 17 is placed on the rear end of the fixed cutting blade 40, and the connecting member 17, the fixed cutting blade 40, and the frame 10 are fastened together by the bolts 20 (see Figs. 5 and 7). In other words, the rear end of the fixed cutting blade 40 is sandwiched between (the bottom plate portion 18 of) the connecting member 17 and (the connection portion 16 of) the frame 10.

[0036] With this arrangement, when the rotary cutting blade 30 rotates around the rotation axis L in conjunction with (in this example, synchronously with) the rotation of the drive wheel 8, at the bottom of the rotary cutting blade 30, the (lower surface) of each blade material 34 of the rotary cutting blade 30 and the (upper surface) of the cutting edge 41 of the fixed cutting blade 40 rub against each other, and grass is clamped and cut between each blade material 34 of the rotary cutting blade 30 and the cutting edge 41 of the fixed cutting blade 40.

[0037] In the illustrated embodiment, the frame 10 and the fixed cutting blade 40 are configured as separate members, but the frame 10 and the fixed cutting blade 40 may be configured as one piece (in other words, a part of the frame 10 may be the fixed cutting blade 40). Also, the inclined portion 14 for supporting the rotary cutting blade 30, etc. is provided on the frame 10, but it may be provided on the fixed cutting blade 40.

[0038] In this embodiment, in order to prevent deformation (floating) of each blade member 34 of the rotary blade 30 during grass cutting, a pressing member 27 is provided on the upper side of each blade member 34 of the rotary blade 30 at the lowermost part of the rotary blade 30, in other words, on the upper side of each blade member 34 of the rotary blade 30 that comes into contact with the cutting edge portion 41 of the fixed blade 40. In the illustrated embodiment, the pressing member 27 is provided integrally with the connecting member 17. The pressing member 27 is formed in a roughly T-shape in a plan view (when viewed from the up-down direction), and includes a pressing portion 28 that extends in the left-right direction (vehicle width direction) along the cutting edge portion 41 (front end portion) of the fixed blade 40, and a connecting portion 29 that extends rearward from the left-right center of the pressing portion 28 to the connecting member 17 (in other words, connecting the center portion of the pressing portion 28 and the front end portion of the connecting member 17).

[0039] With the above-described arrangement, at the bottom of the rotary cutting blade 30, each blade member 34 of the rotary cutting blade 30 passes between the cutting edge portion 41 of the fixed cutting blade 40 and the clamping portion 28 of the clamping member 27 (see Figure 7, etc.), thereby preventing each blade member 34 of the rotary cutting blade 30 from deforming (floating) upward when cutting grass.

[0040] In the illustrated embodiment, a container 7 for collecting cut grass is attached to the operating rod 6. The container 7 is provided at the bottom of the operating rod 6 behind the left and right rotary cutting blades 30 and fixed cutting blade 40 so as to open toward the rotary cutting blades 30 and fixed cutting blades 40 (i.e., toward the front) and so as not to impede the rotation of the rotary cutting blade 30.

[0041] In the grass cutter 1 configured in this way, an operator uses the operating rod 6 to manually push the grass cutter 1 forward, and rolls the drive wheels 8 on the ground, causing the rotary cutting blade 30 to rotate in conjunction (synchronization) with the drive wheels 8. The rotation of the rotary cutting blade 30 causes (each blade member 34 of) the rotary cutting blade 30, which rotates with the drive wheels 8, to rub against (the cutting edge 41 of) the fixed cutting blade 40 fixed to the frame 10, and the grass is pinched and cut between (each blade member 34 of) the rotary cutting blade 30 and (the cutting edge 41 of) the fixed cutting blade 40, thereby performing grass cutting work.

[0042] At this time, by tilting the rotation axis L of the rotary cutting blade 30 with respect to the ground when viewed from the traveling direction T of the frame 10, the rotary cutting blade 30 is sent in one direction within the working range S (FIG. 4) (the lowest part of the rotary cutting blade 30), so the returning rotary cutting blade 30 does not get in the way when cutting tall (long) grass (in other words, the front in the traveling direction T is more open than in the prior art), and the grass is not knocked over by the returning rotary cutting blade from above. Therefore, grass cutting can be performed efficiently regardless of the length of the grass, making it possible to expand the range of applicable work.

[0043] In addition, since the rotational diameter (= outer diameter around the rotation axis L) φa of the rotary cutting blade 30 is larger than the rotational diameter (= outer diameter around the rotation axis L) φb of the drive wheel 8, the circumferential speed of the rotary cutting blade 30 is faster than the circumferential speed of the drive wheel 8, improving the workability of grass cutting work.

[0044] In addition, the rotary cutting blade 30 becomes parallel to the ground at its bottom when it rotates around the rotation axis L, so the grass height can be made constant (the same height). In addition, the rotary cutting blade 30 becomes perpendicular to the ground at its top when it rotates around the rotation axis L, so the width of the grass cutter 1 can be kept as small as possible.

[0045] In addition, a pressing member 27 is provided to suppress deformation (floating) of the rotary cutting blade 30, which prevents the rotary cutting blade 30 from floating during grass cutting and creating a gap between the rotary cutting blade 30 and the fixed cutting blade 40, resulting in malfunction.

[0046] In the above embodiment, the rotation axis L of the rotary cutting blade 30 is inclined with respect to the ground when viewed from the traveling direction T of the frame 10, and is arranged to extend in the left-right direction (direction perpendicular to the traveling direction T of the frame 10) when viewed from the top-down direction (see Figs. 5, 6, etc.). However, as shown in Fig. 10, the rotation axis L of the rotary cutting blade 30 may be arranged to be inclined within a range of about 0° to about 45° (angle θ) with respect to the left-right direction (direction perpendicular to the traveling direction T of the frame 10) when viewed from the top-down direction so that the upper side (tip side) of the rotation axis L is located further forward in the traveling direction T than the lower side (root side). With such an arrangement, the rotary cutting blade 30 may be slightly open with respect to the traveling direction T of the frame 10, making it easier to receive grass.

[0047] In the above embodiment, the rotary cutting blade 30 is disposed on the inner surface (upper surface) of the inclined portion 14, and the lower surface of the rotary cutting blade 30 and the upper surface of the fixed cutting blade 40 are rubbed against each other, but the upper surface of the rotary cutting blade 30 and the lower surface of the fixed cutting blade 40 may be rubbed against each other by changing the arrangement of the rotary cutting blade 30 and the fixed cutting blade 40. In the above embodiment, the rotary cutting blade 30 and the fixed cutting blade 40 are rubbed against each other by the rotation of the rotary cutting blade 30, and grass is sandwiched and cut by the rotary cutting blade 30 and the fixed cutting blade 40, but for example, the fixed cutting blade 40 may be omitted, and grass may be cut by the rotation of the rotary cutting blade 30 alone (by the rotary cutting blade 30 rotating around the rotation axis L).

[0048] In addition, in the above embodiment, the drive wheel 8 and the rotary cutting blade 30 are configured to rotate integrally (at the same rotational period or rotational speed) around the same rotational axis L, but the drive wheel 8 and the rotary cutting blade 30 may also be configured to rotate around different rotational axes at different rotational periods or rotational speeds, for example by using a connecting shaft or gear.

[0049] In the above embodiment, the container 7 is attached to the operating rod 6 that is held by the operator, but the container 7 may be attached to the frame 10. In the above embodiment, the container 7 is shaped to expose the upper side of the rotary cutting blade 30, which has the advantages of being lightweight, easy to dispose of collected grass, and easy to maintain, but as shown in Fig. 11, the container 7A may be shaped to cover almost the entire mower including the upper side of the rotary cutting blade 30, giving priority to the advantages of ensuring safety and reducing the amount of cut grass left behind. The container 7 itself may be omitted.

[0050] In the above embodiment, a manual grass cutter is exemplified in which an operator uses the operating rod 6 to manually push the grass cutter 1 forward and apply a rotational force to the drive wheel 8 and the rotary cutting blade 30. However, the drive wheel 8 and the rotary cutting blade 30 may be rotated using a drive source such as a motor or an engine (in other words, a rotational force may be applied to the drive wheel 8 and the rotary cutting blade 30). In this case, the structure can be simplified by coaxially arranging the drive shaft of the drive source and the rotation axis L of the drive wheel 8 and the rotary cutting blade 30. For example, as shown in Figs. 12 and 13, a control board or the like (not shown) may be arranged on the upper surface of the frame 10, an inclined portion 14 (which is bent inward to give an angle) may be formed at the lower end of the frame 10, and the drive wheel 8 and the rotary cutting blade 30 may be arranged on the outside and inside of the inclined portion 14 as described above, and a motor 50 may be arranged between the drive wheel 8 and the inclined portion 14 as a drive source, and the drive wheel 8 and the rotary cutting blade 30 may be rotated by the drive of the motor 50. In this case, as shown in the figure, a fixed cutting blade 40 with a cutting edge 41 formed between the left and right inclined portions 14 may be disposed, a support wheel 52 may be added to the rear of the frame 10, or the operating rod 6 may be omitted. When using a driving source such as a motor or an engine, the output of the driving source may be adjusted by the operator using a control panel provided on the mower or by remote control, or it may be automatically adjusted by processing information obtained from various sensors mounted on the mower on a control board.

[0051] Furthermore, the mounting positions and numbers of the drive wheels 8, rotary blade 30, and fixed blade 40, and the number of blade members 34 that make up the rotary blade 30 are not limited to those shown in the figures, and can of course be set as appropriate. [Explanation of symbols]

[0052] 1. Grass trimmer 6 Operating rod 7 Container 8 Drive wheels 8A Outer surface of the drive wheel (contact surface) 9 Through holes 10 Frames 12 Support part 14 Slope 15 Through hole 16 Connecting part 17 Connecting members 18 Bottom plate portion of connecting member 19 Cylindrical portion of connecting member 20 Volts 22 Fastening bolt 23, 24 Washer 25 Bearings 26 Nut 27 Holding member 28 Holding part 29 Connection 30 Rotary blade 31 Through hole 32 Fixed part 34 Blade material 40 Fixed cutting blade 41 Cutting edge 42 Volts L Rotation Axis S Work range T Direction of travel

Claims

1. A frame, A drive wheel provided on the frame; a rotary cutting blade disposed on the frame so as to rotate about a rotation axis in conjunction with the drive wheel, A grass cutter that cuts grass with the rotary cutting blade that rotates around the rotation shaft, The rotation axis is inclined with respect to the ground when viewed from the traveling direction of the frame, A grass cutter, characterized in that the rotary cutting blade is arranged around the rotary shaft such that the distance between the rotary cutting blade and the rotary shaft increases from the lower side to the upper side of the rotary shaft.

2. a fixed blade disposed on the frame so as to be in contact with the rotary blade, 2. The grass cutter according to claim 1, wherein the rotary blade and the fixed blade are rubbed against each other by the rotation of the rotary blade about the rotation shaft, so that grass is pinched and cut between the rotary blade and the fixed blade.

3. The grass cutter according to claim 1, wherein the drive wheel and the rotary cutting blade rotate integrally about the rotation shaft.

4. The grass cutter according to claim 1, wherein a rotational diameter of the rotary cutting blade is larger than a rotational diameter of the drive wheel.

5. The grass cutter according to claim 1, wherein the rotary cutting blade is parallel to the ground at a lowermost portion when rotated about the rotation shaft.

6. The grass cutter according to claim 1, wherein the uppermost part of the rotary cutting blade is perpendicular to the ground when the rotary cutting blade rotates about the rotation shaft.

7. 2. The grass mower according to claim 1, wherein the rotation shaft is inclined within a range of 0 degrees to 45 degrees with respect to a direction perpendicular to the traveling direction when viewed from above and below, so that an upper side of the rotation shaft is positioned further forward in the traveling direction than a lower side of the rotation shaft.

8. The grass cutter according to claim 1 , further comprising a pressing member for suppressing deformation of the rotary cutting blade.

9. The grass cutter according to claim 1, further comprising an operating rod for moving the grass cutter and applying a rotational force to the drive wheel and the rotary cutting blade.

10. The grass cutter according to claim 1 , further comprising a drive source for rotationally driving the drive wheel and the rotary cutting blade.

11. The grass cutter according to claim 1, further comprising a container for collecting grass cut by the rotary cutter blade.

Images