JPH0580222U - Mower - Google Patents

Abstract

(57) [Abstract] [Purpose] By increasing the clearance between the cutting blade and the cover provided above the cutting blade, grass is prevented from being clogged between the cutting blade and the cover, and the clearance is maintained. By making it small, it is possible to prevent the cutting blade from hitting obstacles such as block fences and trees during "edge cutting work". A grass mower having a case 10 for holding a cutting blade drive shaft 15 which is rotationally driven, and a disc-shaped cutting blade 17 connected to the cutting blade drive shaft 15, wherein a radius of curvature of the cutting blade 17 is provided. A cover 18 having a slightly larger radius of curvature and having a comb-tooth-shaped cutout portion 19 formed on the outer peripheral portion thereof is positioned above the cutting blade 17 and attached to the case 10, and the cutting blade 17 and the cover 18 are attached to each other. The cover 18 is provided so as to be movable in the direction in which the clearance between them is changed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a mowing machine that performs mowing work by rotating a disc-shaped mowing blade.

[0002]

[Prior Art]

 Conventionally, portable mowers that include a drive unit such as an engine and an electric motor and that rotationally drive a disc-shaped cutting blade by the power from this drive unit have been widely used. During the “mowing work” to mow around obstacles such as block fences, stone walls, garden stones, trees, telephone poles, etc., the cutting blades are damaged due to the blades hitting the block fences, stone walls, garden stones, etc. It is necessary to prevent damage to trees and utility poles by hitting utility poles.

Therefore, in order to prevent the cutting blade from hitting an obstacle such as a block fence or a tree, a cover is attached above the cutting blade, and a structure of a mower equipped with such a cover is used. Will be described with reference to FIGS. 6 and 7.

First, a gear case 2 is connected to one end of a hollow pipe 1, and an engine (not shown) is connected to the other end of the pipe 1. A drive shaft (not shown) for transmitting power from the engine is housed in the pipe 1, and a power from the engine is transmitted in the gear case 2 via the drive shaft. A yarn (not shown) and a cutting blade drive shaft 3 are housed. A disc-shaped cutting blade 6 is connected to the cutting blade drive shaft 3 using a cutting blade retainer 4 and a bolt 5.

Next, a disc-shaped cover 7 is fixed to the gear case 1 so as to be located above the cutting blade 6. The radius of curvature of the cover 7 is set to be slightly larger than the radius of curvature of the cutting blade 6, and a comb-shaped cutout 8 is formed on the outer peripheral portion of the cover 7. Here, the difference between the radius of curvature of the cover 7 and the radius of curvature of the cutting blade 6 is set to "d", and the clearance between the cutting blade 6 and the cover 7 is set to "c".

In such a structure, when cutting the grass by cutting the cutting blade 6 by rotating the cutting blade 6 with the power from the engine, the cutting blade 6 side of the mowing machine is moved toward the grass to cut the grass. The grass that has entered the portion 8 and has entered the cutout portion 8 is mowed by the cutting blade 6. Since the radius of curvature of the cover 7 is set slightly larger than that of the cutting blade 6, even if "cutting work" is performed on a block wall, stone wall, garden stone, tree, utility pole, etc. It is prevented that 6 hits a block wall or trees.

Here, in order to more reliably prevent the cutting blade 6 from hitting a block fence, a tree or the like, it is effective to increase “d” and decrease “c”.

[0008]

[Problems to be solved by the device]

 However, when "d" is increased, a large uncut portion is generated when "deep cutting work" is performed. Also, if "c" is made smaller, grass will be more likely to be clogged between the cutting blade 6 and the cover 7, and the work must be interrupted when removing the clogged grass. Is reduced.

[0009]

[Means for Solving the Problems]

 A grass mower having a case for holding a rotary cutting blade drive shaft and a disc-shaped cutting blade connected to the cutting blade drive shaft, having a radius of curvature slightly larger than the radius of curvature of the cutting blade. At the same time, a cover with comb-shaped cutouts formed on the outer periphery is located above the cutting blade and attached to the case, and the cover is moved in a direction that changes the clearance between the cutting blade and the cover. Freely set up.

[0010]

[Action]

 By moving the cover to increase the clearance between the cutting blade and the cover, grass is not clogged between the cutting blade and the cover, and the work of removing the clogged grass is eliminated, so work efficiency is improved. Is improved. In addition, if the cover is moved to reduce the clearance between the cutting blade and the cover, the cutting blade will be used in "edge cutting work" when weeding obstacles such as block fences, stone walls, garden stones, trees and utility poles. Even if the work is performed in a state of being inclined with respect to the horizontal plane, it is possible to prevent the cover from hitting an obstacle and the cutting blade from hitting an obstacle before the cutting blade hits an obstacle.

[0011]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. First, the case 10 is connected to one end of the hollow pipe 9, and a battery, a switch and the like (not shown) are attached to the other end of the pipe 9. The case 10 is formed by fastening two divided cases 10a and 10b, which are divided into two, with a screw 11 and a nut 12, and a screw 13 and a nut 14. A cutting blade drive shaft 15 rotatably supported by an electric motor (not shown), a reduction gear (not shown) and a bearing (not shown) is housed in the case 10, and the pipe 9 An electric wire (not shown) that connects the battery and the electric motor is wired therein. The lower end side of the cutting blade drive shaft 15 projects outward from the case 10, and the cutting blade drive shaft 15 projecting outward from the case 10 has a circular shape using a tightening nut 16 at its lower end. A plate-shaped cutting blade 17 is fixed.

Next, a substantially fan-shaped cover 18 that covers the upper part of the cutting blade 17 is attached to the case 10, and the radius of curvature of the cover 18 is set to be slightly larger than the radius of curvature of the cutting blade 17. Further, a comb-tooth-shaped notch 19 is formed on the outer peripheral portion of the cover 18. The difference between the radius of curvature of the cover 18 and the radius of curvature of the cutting blade 17 is set to "D".

Here, a pair of frames 20 extending to both sides of the case 10 are fixed to the cover 18, and one round hole 21 and this round hole are provided in these frames 20. An arc-shaped elongated hole 22 centered on 21 is formed. Then, the wing bolts 23 inserted into the round holes 21 and the long holes 22 are screwed into the female screw 24 formed on the head of the screw 13 and the nut 14 to cover the case of the cover 18. Installation to 10 is performed. When the cover 18 is attached to the case 10, the clearance between the cutting blade 17 and the cover 18 is increased by vertically rotating the cover 18 along the elongated hole 22. C ″ can be changed.

In such a configuration, when performing mowing work in a work area where an obstacle such as the block fence 25 exists, first, the mowing work is performed with the block fence 25 left (see FIG. 5). State), and then "edge cutting work" is performed on the grass remaining on the block wall 25.

Here, in cases other than the “cutting work”, the butterfly bolt 23 is loosened, and the cover 18 is rotated upward along the elongated hole 22 with the butterfly bolt 23 inserted in the round hole 21 as a fulcrum. As shown in FIG. 4, the cover 18 is fixed by rotating it to the highest position and then tightening the wing bolt 23. Then, the clearance “C” between the cutting blade 17 and the cover 18 becomes maximum, and the grass is prevented from getting stuck between the cutting blade 17 and the cover 18 even if the amount of grass to be mowed is large. To be done. Therefore, the work of removing the grass clogged between the cutting blade 17 and the cover 18 becomes unnecessary, and the work efficiency is improved.

Next, when performing the “edge cutting work”, the butterfly bolt 23 is loosened to rotate the cover 18 downward, and as shown in FIG. 1, the clearance between the cutting blade 17 and the cover 18 is cleared. The cover 18 is fixed by tightening the wing bolts 23 at the position where "C" is minimized. As a result, when the "edge cutting work" is performed, even if the grass cutting operation is performed while the cutting blade 17 is tilted with respect to the horizontal plane, the cutting blade 17 is covered before hitting an obstacle such as the block fence 25. 18 hits the obstacle, and the cutting blade 17 is reliably prevented from hitting the obstacle such as the block wall 25. Therefore, the safety of the work is improved, damage to the cutting blade 17 is prevented, and the life of the cutting blade 17 is extended. In addition, when the obstacle is a tree, a utility pole, or the like, it is possible to prevent the tree, the utility pole, or the like from being scratched by the cutting blade 17.

In the present embodiment, the description has been given by taking the example of the type of mower in which the cutting blade 17 is rotationally driven by the battery and the electric motor, but as a mower to which the present invention is applied, a conventional example is used. It may be a mower driven by an engine as described in 1. above.

In the present embodiment, the cover 18 is rotated in the vertical direction to change the clearance between the cutting blade 17 and the cover 18, but the cover is vertically moved. The structure may be such that the clearance is changed by translating in the direction.

[0019]

[Effect of the device]

 The present invention is a grass mower having a case for holding a cutting blade drive shaft that is rotationally driven as described above, and a disc-shaped cutting blade connected to the cutting blade drive shaft. A cover having a radius of curvature slightly larger than the radius and a comb-shaped cutout formed on the outer peripheral portion is located above the cutting blade and attached to the case, and a clearance between the cutting blade and the cover is provided. Since the cover is movably provided in the changing direction, the cover is moved to increase the clearance between the cutting blade and the cover to prevent grass from being caught between the cutting blade and the cover. In addition, the efficiency of mowing work can be improved because the work of removing the clogged grass becomes unnecessary, and mowing at the time of obstacles such as block fences, stone walls, garden stones, trees, telephone poles, etc. To “ In “cutting work”, the cover is moved to reduce the clearance between the cutting blade and the cover so that the cover hits the obstacle before it hits the obstacle. It is possible to surely prevent hitting against the ground, and therefore, it is possible to improve work safety and prevent damage to the cutting blade and damage to trees and the like.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which a clearance between a cutting blade and a cover is minimized according to an embodiment of the present invention.

FIG. 2 is a plan view thereof.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a side view showing a state in which the clearance between the cutting blade and the cover is maximized.

FIG. 5 is an explanatory view showing a process of mowing work.

FIG. 6 is a side view showing a conventional example.

FIG. 7 is a plan view thereof.

[Explanation of symbols]

 10 Case 15 Cutting blade drive shaft 17 Cutting blade 18 Cover 19 Notch

Claims (1)

[Scope of utility model registration request] 1. A grass mower having a case for holding a rotary cutting blade drive shaft and a disc-shaped cutting blade connected to the cutting blade drive shaft, wherein the radius of curvature of the cutting blade is slightly smaller than the radius of curvature of the cutting blade. A cover having a large radius of curvature and formed with comb-shaped notches on the outer periphery is located above the cutting blade and attached to the case, in a direction in which the clearance between the cutting blade and the cover is changed. A mower, wherein the cover is movably provided.