JPH0681568B2 - Grass blade - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a mowing blade plate of a mowing machine that uses a blade plate that rotates at a high speed to stroke weeds.

[Problems to be Solved by Prior Art and Invention]

Conventionally, various types of grass cutting blades have been developed for mowers.

The main points are as follows.

A. Type with saw-tooth protruding from the edge of the disk B. Type with ratchet tooth-like protruding teeth on the edge of the disk, and blades formed on the rising steps of the disk C. At 4 or 3 points on the disk Type A, which has a rectangular blade protruding in a cross shape or a Y shape, is prone to blade spillage and is subject to severe wear.

Since B performs the cutting action only at the rising edge, the cutting width becomes small. It also wears easily, but is the most popular.

C is intended to increase the cutting width, but the blade plate is rotating at a high speed, so the grass does not enter well and the result cannot be expected.

In addition, both types are "notch cut", so the cutting edge directly contacts stones, dirt, etc., and the cutting edge is damaged immediately, and the sliding wear of the grass is remarkable and the tip is rapidly worn. There was a flaw.

In accordance with these considerations, the present invention provides a grass cutting blade that has a large cutting width and good weed penetration, excels in cutting power, and does not wear as compared with conventional products and lasts several times longer. Is an issue.

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

Of the left and right corner side edges of each corner 1 of the square board a having several corners 1, each side edge 2 on the rotation direction side that rotates the square board a in use is referred to as the corner side edge 2. One side of the square plate a is convex and the other side is concave with respect to the plate side of the square plate a in the direction of crossing and inclining with respect to the corner side edge 2 toward the rotation direction of the square plate a. A large number of ridges 3 are arranged side by side to deform the cross-sectional shape in the direction parallel to the corner side edge 2 into an uneven corrugated shape, and the corner side edge 2 deformed into the uneven corrugated shape is ground to an upward or downward slope. Moreover, a concave notch 6 is provided in which the blade edge is recessed inward toward the formation direction of the protrusion 3.
A grass cutting blade plate characterized in that a plurality of ridges 3 arranged side by side are formed on a blade edge in parallel with each other so as to form a continuous grass cutting blade b with a slanting blade edge. is there.

[Action]

In claim 1, if the square plate a is a square plate having four corners as shown in FIG. 1, for example, the cutting blade b is provided at four corner side edges on the same side among the left and right corner side edges. When the blade is formed, the length of the mowing blade b becomes 1 and the length becomes long, and the area of the hatched portion a in FIG. 1 becomes large.

Further, since it rotates at a high speed, stones, soil and the like come into contact with the top of the square plate, so that the grass cutting blade b on the side edge 2 of the corner is not damaged.

In addition, the mother square plate is economically planed and a lightweight grass cutting blade plate is obtained.

In Claim 2, when a grass cutting blade b having a wavy edge is formed on the corner side edge 2, in addition to the above-mentioned action, the weeds are reliably caught in the wavy valley and cut and cut, and the grass is also transferred. Since the grass does not wear due to sliding, the grass cutting blade is worn on average, and the cutting blade plate exhibits a superior cutting action without sharply wearing only the tip side.

In Claim 3, for example, a ridge 3 having a convex surface on one side and a concave surface on the opposite side is juxtaposed in parallel with the corner side edge 2 in a direction obliquely intersecting the corner side edge 2. The cross-sectional shape in the direction is deformed into an irregular corrugated shape, and the irregular side corrugated side edge 2
Is ground to the upward or downward slope 4 and is bladed to form a grass cutting blade b having a wavy continuous edge, and in the case of the embodiment shown in FIG. The cutting action is exerted, and the concave notch 6 (concave edge blade 6) exerts the action of catching and cutting the weeds inside the valley.

Moreover, the recessed notch 6 is directed toward the corner plate side plate 2 in a direction intersecting the corner part side edge 2 and in a direction inclined with respect to the corner part side edge 2 in the rotation direction of the square plate a. A large number of ridges 3 having a convex surface on one side and a concave surface on the opposite side were arranged in parallel to each other to deform the cross-sectional shape in the direction parallel to the side edge 2 of the corner into a corrugated corrugated shape, and deformed into this corrugated corrugated shape. A concave notch 6 is formed by grinding the corner side edge 2 upwardly or downwardly, and recessing the blade edge inward toward the formation direction of the protrusion 3.
Are provided by being formed side by side on the blade edge so as to match the formation intervals of the plurality of ridges 3 arranged side by side, so that they are recessed with respect to the rotation direction of the square plate a. By the rotation of, the grass is always recessed in a direction opposite to the grass, so that the weeds can be more accurately caught and cut, and the grass can be cut very well.

As described above, in any case, the cutting width of the mowing blade b is l, which is much wider than the conventional product.

Since the area of the shaded area a in Fig. 1 is much wider than the conventional product, weeds can be prevented from entering even when rotating at high speed, and cutting is controlled by the full width of the mowing blade b. Become.

Upon re-blazing, the sharpness can be restored to the initial sharpness by a simple sharpening operation by simply stroking the upward or downward slope 4 with a grindstone.

〔Example〕

FIG. 1 shows a grass cutting blade b at a total of four corner side edges 2 on the same side of the left and right corner side edges of each corner 1 of a square plate a of about 19 cm square.
Is a blade.

The corner side edge 2 need not be an exact straight line as long as it is a straight blade edge.

In the figure, reference numeral 8 is a mounting hole, and 9 is a partition recess.

FIG. 1 illustrates a case in which eight concave grooves B are diagonally ground on a side edge 2 of a square plate a of about 19 cm square to form a grass cutting blade b having a wavy edge. There is.

FIG. 2 shows that the ridges 3 having a convex shape on one side and a concave shape on the opposite side are arranged in parallel on the corner side edge 2 in a direction intersecting the corner side edge 2 at an angle of about 45 degrees at intervals of several mm. However, the case where the corner side edge 2 is ground with an upward inclination to provide a mowing blade b in which blade edges in which straight edge blades 5 and concave edge blades 6 are alternately arranged are continuous in a wavy shape is illustrated.

FIG. 3 shows that the right and left corner side edges 2, 2'of the corner portion 1 are provided with grass cutting blades b, b'in the front and back rotational symmetry about the corner portion 2 bisector,
That is, a case is shown in which the mowing blade b ′ of each corner portion 1 is formed in the direction opposite to the mowing blade b and the mowing blade b ′ becomes the mowing blade b when the square plate a is turned upside down.

FIG. 4 is an enlarged sectional view of the ridge 3 and shows how to attach the ridge 3.

FIG. 5 shows a case where the periphery of the square plate a is bent upward as shown in FIG. 6, and the square plate a is formed in a shallow dish and inclined upward around the blade plate. By forming the portion 7 and forming the grass cutting blades b and b'on the side edges 2 and 2'of the corners of the upwardly inclined portion 7, the blade plate becomes a sturdy grass cutting blade plate even if the blade plate is thin, and the grass cutting blade on the opposite side is formed. The b'side is always subjected to the polishing action and ground.

When it is turned upside down, a new ground grass cutting blade b'can be used, and by repeating this, it can always be used in a ground and sharp state.

In addition, when re-polishing, all that is required is to press the grindstone placed on the ground or the like in the state of being attached to the grass mower while the grass blade plate is rotated and pressed against the entire circumference of the tip-to-end surface of the upward inclination part 7. Will be ground and can be easily re-bladed.

Furthermore, when mowing grass with the upward slope 7 facing upward,
There is a case where mowing is performed in a downward state, and the cutting height of grass can be used in two stages.

FIG. 7 shows a case where the corner portion 1 of the substantially triangular plate a is formed at 90 degrees and the side edge 2 of the corner portion is provided with a grass cutting blade b similar to that of FIG.

FIG. 8 shows a replacement blade plate composed of a square plate a and a replacement blade plate 11.
A case where 11 is fixed to a corner side edge 2 of a square plate a by, for example, a bolt nut mechanism 12, and a grass cutting blade b as shown in FIG. 2 is formed on the replacement blade plate 11 is illustrated.

〔The invention's effect〕

Since the present invention is configured as described above, (1) the length of the blade edge for cutting weeds can be made extremely long as compared with the conventional product.

(2) Since the area of the shaded area (b) obtained by subtracting the blade plate from the rotation locus circle having the maximum diameter at the tip of the corner becomes very large, the press contact with the cutting edge of the weed becomes effective.

(3) Since stones and soil come into contact with the top of the square plate, the cutting blade on the side edge of the corner is not damaged.

(4) When weeding blades with wavy edges are used, weeds are properly grasped and cut in the valley to increase the cutting ability and the grass does not move, so the grass slides. Since there is no wear, the mowing blade wears on average,
There is no need to replace the tip immediately after it is rapidly worn as in the conventional case.

(5) Since the blade edge of the grass cutting blade is long, it becomes a durable grass cutting blade plate that is hard to wear. Especially, when a corrugated grass cutting blade is adopted, the blade is inside the valley, so that the grass cutting blade plate is harder to wear. .

(6) In any type, since the part to be bladed is the side edge of the corner that is inclined with respect to the radius of rotation, damage to the ground or stones is reduced and the operator side On the other hand, it is safe because it does not bounce off stones and soil.

(7) The grass cutting blade is economical and very light in weight compared to the conventional grass cutting blade, and the work is easier and the burden on the operator is reduced.

(8) It was very difficult to re-blade the conventional product, but the grass cutting blade plate of the present invention can be re-bladed simply by linearly striking the beveled surface with a grindstone, and further when an upwardly inclined portion is provided. It is possible to re-blade immediately by simply rotating it while it is attached and applying it to the grindstone.

(9) In addition, the present invention is not only to cut the weeds with flat teeth or simple wavy tooth, but also to have a cutting action due to the shape of the square plate, and further to have a direction to intersect with the side edge of the corner. A number of ridges having one surface convex and the other surface concave are arranged side by side with respect to the square plate surface in a direction inclined toward the rotation direction of the square plate with respect to the side edge of the corner. The cross-sectional shape in the direction parallel to the side edge is deformed into an uneven corrugated shape, and the corner side edge deformed into the concave and convex corrugated shape is ground upward or downward, and the blade is formed in the direction of the protrusion. Concave notches that are recessed toward the inside of the edge are formed side by side on the blade edge so as to match the formation interval of a large number of juxtaposed ridges, and a continuous cutting blade with a wavy slope is formed. Since it is provided, the concave notch (concave edge blade)
The weeds will be cut while catching weeds inside the valley, and the concave notch formed on the wavy blade edge that is continuously inclined is recessed in the direction of rotation of the square plate. Since it is recessed in a direction that is always opposite to the grass due to the rotation of, the weeds can be more accurately captured and stroked, resulting in an excellent grass cutting blade that can cut grass very well.

It is a grass cutting blade with excellent practicality.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a plan view of the grass blade of claims 1 and 2 of the present invention, FIG. 2 is a plan view of the grass blade of claim 3, and FIG. The figure shows a rear view of the essential part of the grass blade of another example claim 3 in which a grass cutting blade is provided on both sides of the corners facing each other with the corner as a boundary, and FIG. 4 is a line AA of FIG. Cross section,
FIG. 5 is a back view of another example of the mowing blade plate, and FIG. 6 is B of FIG.
Fig. 7 is a cross-sectional view taken along line -B, Fig. 7 is a plan view of the grass blade plate of claim 3 of another example, and Fig. 8 is a plan view of a main part of another example that employs a replacement blade plate. a ... square plate, b ... mowing blade, 1 ... corner, 2 ... corner side edge, 3 ... projection, 6 ... concave notch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-111723 (JP, A) JP-A-52-150230 (JP, A) Actually open Sho-53-9223 (JP, U) Actual-open Sho-52- 28295 (JP, U) Actual public 45-22273 (JP, Y1) Actual public 36-3632 (JP, Y1)

Claims (1)

[Claims] Claim: What is claimed is: 1. Among the left and right corner side edges of each corner of a square plate having several corners, a corner side edge on the rotation direction side that rotates the square board during use is used as the corner side edge. A ridge having a convex shape on one side and a concave shape on the opposite side with respect to the plate surface of the square plate in a direction intersecting with the side edge of the square plate toward the rotation direction of the square plate. A large number of them are arranged in parallel and the cross-sectional shape in the direction parallel to the side edge of the corner is deformed into a corrugated corrugation, and the side edge of the corrugated corrugated corner is ground upward or downward, and the direction in which the ridges are formed. A concave cutout portion in which the blade edge is recessed inward toward the edge, is formed side by side on the blade edge so as to match the formation interval of a large number of juxtaposed ridges, and the blade edge has a wavy shape. A mowing blade plate characterized by forming continuous mowing blades.