JPH048740Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Industrial application field" This proposal concerns a grass cutting blade for a brush cutter.

``Prior art'' Conventional rotary mowing blades for brush cutters have a grounding protrusion on the lower surface of the center of the mowing blade to prevent the rotary mowing blade from directly touching the ground (Utility Model No. 54-168341).
issue). For this reason, the mowing blade rose above the ground and came into contact with the floating part of the grass, making it difficult to cut the blade, so the blade was tilted and the cutting edge touched the ground to cut the base of the grass roots. Moreover, it is possible to cut the grass only in the direction in which the handle is moved in the direction of rotation of the mowing blade, and it is difficult to cut the grass even if the handle is moved in other directions. Since the blade tips contact the ground at an angle, dirt and mud are thrown up in the direction of rotation of the tilting blade, and not only does the dirt and mud stick to the face of the person holding the handle of the brush cutter, but the blade also The mowing blade was so worn that it was necessary to replace it within a few hours. Also, a device that mowing the lawn between the two cutting blades by rotating the cutting edges of a pair of cutting blades in sliding contact with each other.
51873), but if only a part of the cutting blade is damaged, the entire cutting blade must be replaced, and a drive and transmission mechanism for the cutting blade is essential, making the device heavy and difficult to operate. There was a problem that made it difficult to achieve good efficiency. Furthermore, a device (Japanese Unexamined Patent Publication No. 114217/1984) was proposed in which the cutting edge was provided on the outer periphery side of the rotating disk, but the grass to be cut was bent from the cutting edge in the direction of movement of the cutting edge. There was a problem that the sharpness was not good because it would get stuck and escape.

``Problem to be solved by the invention'' This invention can cut at the root of the grass roots without splashing up dirt or mud, has good cutting ability, and can be moved forward, backward, left, and right, regardless of the direction of movement of the handle of the brush cutter, that is, the direction of movement of the mowing blade. The purpose of the present invention is to obtain a mowing blade that has a good cutting quality even when moved and has a long service life.

``Means for Solving the Problems'' In order to achieve the above purpose, the present invention is a rotating disk or rotating blade provided at the tip of the handle, with a rotating disk or rotating blade provided on the lower surface of the disk or rotating blade away from the center of rotation. A plurality of small-diameter circular blades having a plurality of through-holes bored therein and female screws protruding from the upper surface thereof are inserted into the through-holes so that the same circular blades are parallel to the disk or rotary blade. Fix the same circular cutter to the same disc or rotary blade with bolts and nuts so that the cutting edge formed on the periphery of the circular cutter is located closer to the center of rotation than the periphery of the disc or rotary blade. It consists of a grass cutting blade for a brush cutter.

``Operation'' Therefore, when the handle of the brush cutter is held and the rotary disk or rotary blade at the tip is rotated around the central axis, the small-diameter circular cutter at the lower end of the plurality of protrusions provided on the lower surface also rotates around the central axis. Rotate. In this state, when the lower surface of the small-diameter circular cutter is brought into contact with the ground to brush away the grass, the peripheral edge of the rotating disk or rotary blade first comes into contact with the stem of the grass, and the stem bends in the direction in which the circumferential edge moves. On the other hand, since the root of the grass is fixed to the ground, it receives a reaction force from the same periphery in the opposite direction of movement. Next, the cutting edge of the small-diameter circular blade located closer to the center of rotation than the peripheral edge comes into contact with the root, and the root is cut. In addition, since the same root is cut only from one side of the same root by the same cutting edge, good sharpness can be obtained even if the stem diameter is not constant. Furthermore, during this mowing work, the soil and mud splashed by the small-diameter circular cutter is blocked by the disk or rotary blade and is not thrown up, and the dirt and mud are not thrown up in the direction of movement of the rotary disk or rotary blade. Regardless, the grass is cut from the root by the rotation of the small-diameter knife. In addition, if the sharpness of the blade edge deteriorates during mowing work, release the female screw fixation with the bolt and nut, rotate the unworn part of the small diameter circular blade, fix it again with the bolt and nut, and then remove the screw. It is something that performs work.

"Example" A gearbox 6 is provided at the tip of the handle 1 of a brush cutter,
A rotary disk 2 or a rotary blade 3 is detachably supported on a drive shaft 7 extending from the box 6 by bolts 8. As shown in FIG. 3, this rotary disk 2 or rotary blade 3 has a plurality of through holes 9 drilled at positions away from the center, and bolts 10 are inserted into each of the through holes 9. The bolt 10 is screwed into a female screw 11 disposed on the lower surface of 3 to form a protrusion 4, and the bolt 10 is tightened and fixed with a nut 12 on the upper surface. These bolts 10 and nuts 12 constitute a fixing member 13. And the female screw 11
A small-diameter circular cutter 5 parallel to the disk 2 or rotary blade 3 is fixed to the lower end by welding or the like. The above through hole 9
It is preferable that the positions thereof be equidistant from the center in the radial direction and equally spaced from each other. When deforming the small-diameter circular cutter 5 due to wear, loosen the nut 12, rotate the cutter 5, and move the unworn portion of the cutting edge 5a of the cutter 5 in the direction of rotation of the disk 2 or rotary blade 3. can be corrected.

``Effects of the invention'' Since this invention is constructed as described above, there is no risk of getting dirt, mud, dirt, or gravel on the face or upper body when mowing the grass, and it is possible to cut the roots of the grass roots with good cutting power, stem diameter, and strength. To obtain a grass cutting blade for a brush cutter which can cut weeds from the root even if the weeds are not constant and can remove weeds even if the weeds are moved forward, backward, left or right, and which has good weeding efficiency. Furthermore, since it is sufficient to drive only the rotating disk or the blade, the entire brush cutter can be made lightweight and simple, and work efficiency can be improved. Furthermore, if a small-diameter circular cutter becomes worn and deformed, you can loosen the nut and move the unworn part of the cutting edge of the same circular cutter in the direction of rotation of the disc or rotary blade, thereby making it possible to lengthen the small-diameter circular cutter without having to replace it. It can withstand use for a period of time.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the top of the mowing blade for a brush cutter, Figure 2 is a perspective view of the bottom of the blade, Figure 3 is an enlarged vertical sectional view taken along line A-A in Figure 1, and Figure 4. 5 is a bottom view of the rotary disk, and FIG. 6 is a partially enlarged view of FIG. 4. 1...Handle, 2...Rotating disc, 3...Rotating blade, 5
...Small diameter circular knife, 5a...Blade tip, 9...Through hole,
10...Bolt, 11...Female screw, 12...Natsuto.

Claims (1)

[Scope of utility model registration request] A rotating disk or rotary blade provided at the tip of the handle, with multiple through holes drilled in the lower surface of the disk or rotary blade at positions away from the center of rotation, and a female screw protruding from the upper surface. Attach the same female screw parts of the plural small diameter circular cutters to the above-mentioned through holes, and attach the same circular cutters to the same disc or rotary blade with bolts and nuts so that the same circular cutters are parallel to the above-mentioned disc or rotary blade. A mowing blade for a brush cutter, which is fixed and has a cutting edge formed on the periphery of the circular blade and positioned closer to the center of rotation than the periphery of the disc or rotary blade.