Mobile grass cutter

Abstract

To provide a device that safely cuts grass while riding, by attaching a mobile grass cutter to a two-wheeled vehicle.SOLUTION: There is provided a mobile grass cutter which can travel without obstruction by rotating a rotary shaft 2 that is brought into contact with a tire 10 of a front wheel of a two-wheeled vehicle and a cutter 7 mounted thereon, making a length of the cutter 7 shorter toward an outer side so as to allow a vehicle body to turn while being inclined and ensuring a clearance with a ground surface on an inner side of turning, which can travel a long distance with no-load operation without driving the cutter 7 by changing positions of brackets 5 that support the rotary shaft 2 at both ends, and which can safely cut grass by adopting measures of moderately slipping the tire by installing a spike plate between the tire 10 and the rotary shaft 2 so as to prevent sudden stopping of the tire 10 and overturning due to biting-in of branches or the like.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This proposal is a mobile grass cutter with wheels, This relates to a device for cutting grass while riding or pushing it. [Background technology]

[0002] On hiking trails, trekking courses, mountain bike courses, etc. The road was unpaved and required mowing along a long course that made use of the natural terrain, which placed a heavy burden on workers who had to mow the grass by hand. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 59-050224 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-273390 Summary of the Invention [Problem to be solved by the invention]

[0004] Existing inventions include, for example, the one described in Patent Document 1, in which the tip blade portion of a push lawn mower or the like, with the handle removed, is attached to a bicycle to mow the grass. This three-wheeled self-propelled lawnmower with two front wheels is said to be designed in a similar manner to a regular two-wheeled bicycle; in the design of a regular two-wheeled bicycle, the inverted Y-shaped front frame (usually called the front fork on a bicycle) that holds the front wheel and acts as the pivot point for the handlebars is installed at an angle of approximately 70° from the ground on the rear wheel side to the direction of travel when viewed from the side, in order to improve straight-line stability.As a result, when turning the handlebars in the direction of a turn, the body of the vehicle tilts in the opposite direction, making it difficult to drive and lacking in agility. Furthermore, the self-propelled lawnmower described in Patent Document 1 has two front wheels that are horizontal and positioned perpendicular to the direction of travel. Therefore, if only one of the front wheels runs over a stone or other object, Since only one side is lifted, the vehicle body tilts suddenly, creating a risk of overturning. Furthermore, if a large, hard object such as a branch gets caught in the blade while mowing, the rotating blade rotates together with the drive shaft, and the drive shaft and large diameter gear rotate together, while a small diameter gear is formed on the inside of the tire. The gears mesh and rotate in tandem, so the wheels will suddenly stop rotating and there is a risk of the mower tipping over, making it unsuitable for use on mountain roads or uneven ground. Furthermore, since the rotary blade, drive shaft, large diameter gear, small diameter gear, and tire are all interlocked by gears, there is constant resistance to the rotation of the blade, making it unsuitable for moving over long distances.

[0005] In another invention, as in the example of Patent Document 2 (see JP 2009-273390 A), Some mowers are towed behind large machinery such as tractors, but because they are large, with the tractor being approximately 1.5m wide and the mowing attachment having a mowing width of 1.2m to 1.5m (according to the Yanmar website), they cannot be carried on narrow trails of around 0.6m wide such as hiking trails or mountain bike trails. Also, when going over steps or rocks, the attachment weighs around 200kg and the tractor weighs over 1700kg, making them unsuitable for use on mountain trails. Commercially available small brush cutters are lightweight, easy to handle, and easy to use, but since they require workers to travel on foot, mowing grass on long mountain paths can be a burden on the workers. [Means for solving the problem]

[0006] The present invention relates to an inverted Y-shaped front fork that rotatably holds the front wheel of a motorcycle. a frame unit in which the main frame is reinforced by an upper frame; and a rotary shaft unit on which twelve foldable cutters are installed, the cutters being attached to the lower part of the bottom frame via brackets as position adjustment supports, in a position horizontal and perpendicular to the direction of travel, and which rotate in contact with the tire of the front wheel. Compared to the tricycle described in Reference 1, the body can be tilted in the direction of turning, It can turn with a natural shift in the center of gravity. Also, because it is a two-wheeled vehicle, the center of gravity is at the center of the contact surface of each tire, so the vehicle is not easily affected by stones, etc. Even when going over an obstacle, the center of gravity is kept at the center of the tire, so no force is generated to lift the vehicle from the side, and the vehicle does not tilt suddenly.

[0007] In the present invention, the frame unit is made of lightweight aluminum plates and bent aluminum pipes, and is not a large heavy machine as described in Reference 2, but is small and lightweight, can be carried, and is desirably easy to handle when used on narrow mountain paths.

[0008] In the present invention, it is desirable that the cutter of the rotary shaft unit be of a retractable type so that when the rotation load is too large, the force is released so as not to interfere with the rotation of the rotary shaft unit.

[0009] In the present invention, the cutter of the rotary shaft unit is installed inside. It is desirable that the length of the cutter and the cutter installed on the outside be reduced in a ratio of 2:1 so that clearance can be obtained between the cutter and the ground when the motorcycle turns and the body tilts.

[0010] In the present invention, the cutter of the rotary shaft unit moves straight without turning. In order to respond to the grass cutting situation, it is possible to change the lengths of the cutters 7 attached to the inside and outside of the rotary shaft unit and attach them with the same length.

[0011] In the present invention, the blade member attached to the tip of the cutter of the rotary shaft unit is made by bending a thin iron plate into a U-shape, and the cutter during rotation just comes into contact with the ground or stones. In the event of a straight impact, the cutter should preferably bend to relieve the load and avoid the risk of the occupant falling. The blade member of the cutter is attached to the spacer member by the shaft B, The spacer members are rotatably attached to the rotating shaft by axis A, and when the cutter blade member hits an obstacle that cannot be cut, it falls over to release the load. It is desirable that the risk of the passenger falling is avoided.

[0012] In the present invention, the spike plates of the rotating shaft unit have bolts and nuts fixed as protrusions at the parts that come into direct contact with the tire, and the frictional resistance with the front tire is adjusted by the degree to which the bolt heads protrude, thereby reducing the resistance between the front tire and the spike plates; when the rotating shaft unit is about to spin freely, the bolt heads are protruded to increase resistance and maintain rotation; conversely, when a load is applied to the cutter, causing the rotating unit to stop and the front tire to also stop, it is desirable that the bolt heads be lowered to avoid the risk of falling, and adjustments can be made to allow the front tire to spin freely.

[0013] In the present invention, a support member that enables position adjustment of the rotary shaft unit is provided. By changing the mounting position on bracket 5 to the front hole, The rotary shaft unit does not come into contact with the tire 10 and does not rotate during no-load operation. It would be desirable to make this possible and facilitate long-distance travel.

[0014] In the present invention, a mobile grass cutter is mounted on a general-purpose motorcycle. In order to install it, it is necessary to adjust the position of the rotating shaft unit to correspond to the size of various wheels, and the bracket of the support of the rotating shaft unit The mounting position on the frame unit can be moved back and forth in the direction of travel. It is desirable that this is the case.

[0015] In the present invention, when it becomes necessary to change the depth of grass cutting to suit the conditions at the work site, it is desirable that the mounting position of the rotating shaft unit on the bracket can be changed up or down.

[0016] In the present invention, grass becomes entangled around the spike plates of the rotating shaft unit, In order to prevent the rotation from being unable to be maintained, It is desirable to fix one of the short sides of a rectangular grass entanglement prevention guard to the lower end of the bottom frame in the direction of travel with two bolts, and align the other short side under the spike plate in the center of the rotating shaft unit to prevent grass from getting caught.

[0017] In the present invention, the rotating portions at both ends of the rotary shaft unit and the rotary shaft unit A pipe-shaped grass entanglement prevention collar is attached between the bracket and the Prevent grass from getting tangled in the rotating part and the fixed bracket. It is desirable to prevent this. [Effects of the Invention]

[0018] According to the present invention, a mobile grass cutter can be attached to a general-purpose two-wheeled vehicle, You can now safely mow the grass while riding or pushing it. [Brief explanation of the drawings]

[0019] [Figure 1]1 is an overall view showing an embodiment of a mobile grass mower according to the present invention and a mobile grass mowing device in which the mobile grass mower is attached to a mobile body. [Figure 2] FIG. 10 is a top view of an example of a mechanism for connecting a mobile grass mower to a mobile body. [Figure 3] FIG. 1 is a diagram of a frame unit consisting of a main frame 1, an upper frame 4, and a bottom frame 3. [Figure 4] 1 is a diagram of a rotary shaft unit showing an example of mounting a cutter 7, a rotary shaft 2, a spike plate 6, and a bracket 5. FIG. [Figure 5] 10 is an enlarged side view and top view showing an example of fixing the rotating shaft 2 to the bracket 5 and an example of attaching the cutter 7. [Figure 6] 10 is a diagram showing an example of installation of a spike plate 6, a bolt 13, and a washers 14. FIG. [Figure 7] 1 is a diagram showing an example of installing a grass entrapment prevention guard 11 on a bottom frame 3 and an example of installing a grass entrapment prevention collar 12 on a rotating shaft 2. [Figure 8] FIG. 1 is a side view of a mobile grass cutter, showing an image of the grass being cut. DETAILED DESCRIPTION OF THE INVENTION

[0020] A plate-shaped frame is installed on both sides of the motorcycle's front fork, Between them, a vertically rotatable shaft with a grass cutting blade is installed so that its position can be adjusted. The front tire rotates in contact with the shaft to drive the grass cutting blade. You can ride the two-wheeler forward or walk and push it to cut grass. [Example]

[0021] An embodiment will be described below with reference to the accompanying drawings. As shown in FIG. 1, the main frame 1 is attached to the front fork 8 of the moving body 30. A rotating shaft 2 and a cutter 7 are attached inside it. As an example of a method for attaching the front fork 8 of the vehicle 30 to the main frame 1, a metal band is inserted through bolts at both ends to clamp the front fork 8. The method of fixing to the main frame 1 is shown. When the front wheel 9 rotates, the rotary shaft 2 in contact with the tire 10 rotates. Cutters 7 mounted radially on the rotating shaft 2 rotate to cut grass passing around the tire.

[0022] As shown in Figure 3, the main frame 1 is made of aluminum plate material to provide strength and plays a role in connecting each part, and together with the upper frame 4 and bottom frame 3, It serves to protect the occupant from the rotating shaft 2, the cutter 7, grass, and obstacles. As shown in Figure 4, the rotating shaft 2 is made of a round pipe with a cutter 7 attached. Both ends are fixed to aluminum L-shaped angle brackets. By being attached to the bottom frame 3 in a position adjustable state, It is designed to accommodate a variety of motorcycle tire diameter sizes.

[0023] The rotating shaft 2 can get tangled with vines and other things, so it is fixed to the bottom frame 3 with a thumbscrew so that it can be removed and untangled whenever necessary. It can be disassembled and cleaned without tools. Figure 5 shows the attachment from the side and top. Details of the example of fixing the bracket 5 and bottom frame 3 and details of the example of installing the cutter 7 are shown below. Illustrated. As shown in Figure 5, a bolt is passed through the flange-shaped collar of the rotating shaft 2, The cutter 7 is mounted in a freely rotatable manner and is positioned outside the axis of the rotating shaft 2. The cutters 7 are attached directly to the flanges with bolts, and the inner cutter 7 is attached to the rotating shaft 2 with a U-shaped arm sandwiched between them with bolts. At this time, the rotation radius of the cutters 7 can be changed by changing the position of the bolt holes in the U-shaped arm. In addition, if the blade at the tip of the cutter hits an obstacle, The spacer members are arranged along axes A and B, which are parallel to the rotating shaft. It has a foldable structure so as not to interfere with the rotation of the rotating shaft. The cutting edge of the cutter 7 is located on the inside and outside of the axis of the rotating shaft 2. All of them are common, and depending on how the U-shaped arm is attached, the rotation radius of the cutter 7 can be unified to the same length, In this example, the outer edges are shorter, taking into consideration the maneuverability of the bicycle. It has been installed.

[0024] As shown in Figure 6, the contact area between the tire 10 and the rotating shaft 2 often loses grip due to various factors such as moisture in the grass, sand, and branches, so the contact is not between rubber and rubber, but rather a spike plate 6 with a bolt 13 and flat washer 15 fixed with a nut 14 as a protrusion, which is fixed spirally around the rotating shaft 2, giving it the effect of a studded tire and increasing grip. In addition, to prevent the front wheel from stopping and the bicycle from tipping forward due to excessive grip, the length of the bolts 13 extending from the spike plate 6 is adjusted with nuts 14, achieving a grip that is not too strong according to the conditions at the time of mowing.

[0025] As shown in Figure 7, the bottom frame 3 is positioned at the bottom of the tip in the direction of travel. A grass entanglement prevention guard 11 is attached and lightly placed under the spike plate 6 of the rotating shaft 2 to prevent long grass from getting entangled in the shaft. In addition, at both ends of the axial direction of the rotating shaft 2, A pipe-shaped grass entanglement prevention collar 12 with a slightly larger inner diameter is inserted in a freely rotatable state, so that even if the rotating shaft 2 entangles grass, it does not rotate together with the grass, thereby preventing entanglement. Figure 8 shows the attachment from the side, illustrating how the grass is cut. [Industrial Applicability]

[0026] Products for mowing and maintaining mountain bike trails A product that cuts grass and maintains a section of the mountain trail so that bicycles can pass through. Products for mowing and maintaining parks and riverside areas A product that can be used in areas and countries where there is no electricity, no fuel, or where difficult repairs cannot be made. This product can be combined with an electric assist bicycle to mow the grass with less effort required to pedal. This product allows you to enjoy riding a bicycle and use mowing the grass as exercise. [Explanation of symbols]

[0027] 1. Mainframe 2 rotating shafts 3 Bottom Frame 4 Upper Frame 5 Bracket 6 spike plates 7 Cutter 8 Front fork 9 Front Wheel 10 tires 11 Grass tangle prevention guard 12 Grass tangle prevention collar 13 volts 14 nuts 15 flat washer 16 axis A 17 axis B 30 Mobile 40 Mobile grass cutter 50 Grass-cutting moving device

Claims

1. A mobile body mower that is attached to a mobile body having wheels and cuts grass, a rotating shaft that rotates when subjected to the rotational force of the wheel; a cutter attached to the rotating shaft; A mobile grass mower characterized by comprising:

2. The mobile grass mower according to claim 1, A mobile grass mower characterized in that the rotating shaft is in contact with the wheel and receives a rotational force directly from the wheel.

3. 3. A mobile grass mower according to claim 2, wherein the rotary shaft has a protruding portion at a portion where the rotary shaft contacts the wheel, the protruding length of which is adjustable.

4. The mobile grass mower according to any one of claims 1 to 3, The mobile grass mower is characterized by comprising a guard arranged in front of the wheel to prevent grass cut by the cutter from flying toward the wheel.

5. The mobile grass mower according to any one of claims 1 to 3, A mobile grass mower comprising a grass entanglement prevention collar rotatably attached to the rotary shaft in the vicinity of a support that rotatably supports the rotary shaft.

6. The mobile grass mower according to any one of claims 1 to 3, The mobile grass mower is characterized in that there are multiple cutters, and some or all of the cutters are long in the radial direction of the rotating shaft and have a spacer member whose base is rotatably attached to an axis A parallel to the rotating shaft, and a blade member rotatably attached to the tip of the spacer member on an axis B parallel to the rotating shaft.

7. The mobile grass mower according to any one of claims 1 to 3, A mobile body mower characterized in that a member connecting the support body to the mobile body, or the support body, is provided with a position adjustment mechanism that enables adjustment of the position of the rotating shaft relative to the connecting part.

8. A grass-cutting mobile device having a mobile body with wheels and a mobile body mower attached to the mobile body for cutting grass, The mobile grass mower comprises: a rotating shaft that rotates when subjected to the rotational force of the wheel; a cutter attached to the rotating shaft; A grass-cutting moving device characterized by comprising:

9. The grass cutting and moving device according to claim 8, The mobile grass mower is characterized in that the rotating shaft is in contact with the wheels and receives rotational force directly from the wheels.

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