JPS6014322Y2 - cultivating claws - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in tiller claws used in rotary tillers.

The blade part of the blade on the rotating front edge of the blade is double-edged in the vertical part and single-edged in the horizontal part to reduce the resistance applied to the blade.
It is said to be advantageous in preventing twisting of the blade, and has been commonly practiced as seen in Japanese Utility Model Publication No. 39-10501.

However, in conventional tiller blades, when the vertical blade part is double-edged, the blade surface formed on the inside surface of the blade has a sloped surface that has the same width over the entire area from the mounting base to the tip. In addition to the blade surface, the blade surface on the outer surface of the blade is a sloped blade surface that becomes wider as it moves away from the horizontal blade curvature base toward the mounting base, and these both inner and outer blade surfaces form a double edge.

Therefore, in a plowing claw with such a blade configuration, the cutting edges of the vertical blade are in the thickness direction of the blade, resulting in unbalanced double-edged blades whose positions are not constant. As the blade is being driven in, the position of the cutting edge changes horizontally as it is driven in, causing the problem that the vertical blade part receives varying lateral pressure, causing vibrations in the blade. Ta.

In addition, since the double-edged edges of the vertical blade part are formed in such a way that the blade surface on the outer surface of the blade becomes narrower as it approaches the tip of the blade, the wedge angle of the blade increases as it approaches the tip of the blade. When the blade with a large wedge angle is driven into the soil, there is a lot of resistance, and if the soil is hard, the cutting depth is insufficient and a dash phenomenon occurs, which can lead to problems such as vibration reduction and cutting performance. The improvement in performance was sufficient.

Therefore, in this invention, the double-edged vertical blade part formed on the vertical blade,
By positioning the cutting tip in the center of the blade thickness direction over the entire area from the blade attachment base to the horizontal blade bending start point, when the vertical blade part cuts into the soil, the cutting tip will not move horizontally. In this way, the lateral pressure applied to both sides of the blade is balanced, and the occurrence of vibration due to lateral pressure imbalance is reduced. The width of the blade continues to become wider as it approaches the tip, and by forming a single edge with the inner side of the blade on the side of the blade, the entire blade has a blade with a small wedge angle at the tip. The present invention provides a plowing chisel with a structure that reduces the resistance to driving into the soil.

The embodiments shown in the drawings will be described below.

FIG. 1 shows a side view of the entire tilling claw, and FIG. 2 shows a front view of the tilling claw as viewed from the front edge blade portion.

A vertical blade part A extends from the mounting base 1 having a hole 7 for inserting a bolt into the holder 6 of the tilling claw shaft 5, and a horizontal blade part B is extended laterally from the tip of the vertical blade part. A double-edged blade part a is formed on the vertical blade part A that extends forward in the rotation direction, and a single-edged blade part A is formed on the horizontal blade part B, unlike the conventional machete claw. However, the plowing claw of the present invention is formed with a special structure in which the blade part can be extended next.

That is, on the inner surface of the vertical blade part A (the side where the horizontal blade part bends), the blade width gradually increases from the point close to the mounting base 1 to the tip of the horizontal blade part. Furthermore, on the outer surface of the vertical blade part A, a blade surface 3 is provided which becomes wider as it approaches the tip between the point near the mounting base 1 and the starting end where the horizontal blade part starts bending. The cutting edge formed by the double-edged surfaces 2 and 3 forms a double-edged blade located at the center in the thickness direction of the vertical blade part A, and the wedge angle of the double-edged blade is as shown in the cross-sectional shape in FIGS. 3 and 4. The size should gradually become smaller from the part near the mounting base 1 to the tip of the blade.

The blade portion of the horizontal blade portion B that bends and extends in the horizontal direction from the tip of the vertical blade portion A is formed into a single blade surface 4 that is only the blade surface that is continuous with the inner blade surface 2 of the vertical blade portion described above. It is.

In other words, the cutting edge that is located at the center of the blade in the thickness direction of the vertical blade up to the starting point where the horizontal blade begins to bend is located at the outer edge of the blade in the thickness direction from the starting edge to the horizontal blade. The single blade surface 4 changes smoothly and continuously so that the inner surface of the horizontal blade part B
It is done so that it is formed.

FIG. 7 shows a rear view of the rotary tiller, in which the tiller claw shafts 5, 5 are extended from both sides of the lower part of the tiller case 8 and a rotary cover is attached to form a center drive type. When the claws are used for cutting, they are attached to the right-hand tiller claw shaft 5, and when the tiller claws formed symmetrically with the above-mentioned tiller claws are attached to the left-hand tiller claw shaft 5, the horizontal blades of each tiller claw are attached to the tiller claw shaft 5 on the left. B is attached in a state bent inward.

However, when each tiller claw is arranged and attached to a rotary tiller as described above, each tiller claw is driven into the soil while rotating as shown by arrow A during tilling work. First, the blade part a of the vertical blade part A, which is close to the horizontal blade part 1 side, is driven forward, and then the blade part of the horizontal blade part B is driven in to plow.

When each tiller claw is driven into the soil, the vertical blade part A
Since the cutting tip is located at the center of the blade in the thickness direction, lateral pressure is applied evenly to both the inside and outside sides of the blade, eliminating the possibility of uneven load, preventing sideways wobbling and preventing bending and vibration of the blade. is reduced and the cutting operation is easy.

Furthermore, since the wedge angle of the vertical blade portion becomes smaller as the cutting progresses, the cutting can be performed well even in hard soil, so the dashing phenomenon does not occur, and the soil can be tilled to the desired plowing depth.

As explained above, the present invention has a horizontal blade part B that bends and extends laterally from the vertical blade part A at the tip of the vertical blade part A whose blade thickness decreases from the mounting base 1 to the tip. In the continuous tilling claw, the vertical blade part A
To form the blade part a of the double-edged surfaces 2 and 3 where the tip is located in the center of the blade thickness direction, the blade surface 3 on the outside of the vertical blade part becomes the tip between the mounting base and the horizontal blade bending start point. The blade surface 2 on the inside of the vertical blade part is formed so that it becomes wider as it approaches the tip from the mounting base to the tip of the horizontal blade part. The cutting edge located at the center in the thickness direction changes to be located at the outer edge in the thickness direction of the blade in the horizontal blade section from the bending start point to the tip, and the cutting edge has a single-edged surface 4 on the inside of the bend. Since the parts are formed continuously, there are the following advantages.

The double-edged part of the vertical blade part of a conventional tiller claw is an unbalanced double-edged part in which the cutting edge is not located in the center in the thickness direction of the blade, but is offset. Therefore, since the wedge angle was large, when cutting into the soil, uneven lateral pressure was applied by the unbalanced blade, causing bending and vibration of the blade, and the wedge angle became larger towards the tip. However, in this invention, the outer blade surface 3 of the vertical blade part is made to gradually become wider from the mounting base 1 to the horizontal blade bending start point, which increases the digging resistance and easily causes the dash phenomenon. In this case, the cutting edge is continuous with the outer surface of the horizontal blade part, and the inner blade surface 2 is formed from the mounting base to the tip of the horizontal blade part so that it becomes wider toward the tip. By forming double-edged blades located in the center to equalize the inner and outer pressures, it can be smoothly and continuously transferred to the horizontal blade part of the single-edged surface, and the wedge angle at the blade part of the horizontal blade part can also be made smaller toward the tip. When the plowing chisel is driven into the soil, lateral pressure that is balanced on the inside and outside is applied to the vertical blade, which prevents sideways vibration and problems such as bending of the blade and vibrations caused by uneven loads. The wedge angle of the vertical blade becomes smaller as it gets closer to the tip of the blade, so as the cutting progresses, the cutting is performed reliably even in hard soil, eliminating the dash phenomenon. , plowing with reduced cutting resistance as a whole becomes possible.

In addition, the inner blade surface of the vertical blade part is continuously formed so that it becomes wider toward the tip of the horizontal blade part, and a single-edged surface is formed on the horizontal blade part, so the double-edged blade surface with the cutting tip located in the center of the blade is formed continuously. The vertical blade part and the single-edged surface of the horizontal blade part are smoothly connected without any steps, preventing stress concentration at the bending start end of the horizontal blade part, and the wedge angle of the horizontal blade part is also reduced, reducing driving resistance. When lifting excavated soil with the horizontal blade, the single-edged surface on the inside of the blade, which has a wide tip, acts on the lifted soil in a direction that reverses it. This method has the advantage of improving soil reversibility.

[Brief explanation of the drawing]

Fig. 1 is a side view of the tiller claw according to the present invention, Fig. 2 is a front view of the tiller claw seen from the blade side, and Figs. 3, 4, and 5 are I of Fig. 1. -I line, ■-■ line O and ■-
6 is a cross-sectional view taken along the line (2), FIG. 6 is a front end view of the horizontal blade portion, and FIG. 7 is a rotary tiller. 1... Mounting base, 2, 3... Blade surface, 4
...Single edge surface, A...Vertical blade part, B...
...Horizontal blade part, a...Blade part of vertical blade part, b...
...The blade part of the side blade part.

Claims (1)

[Scope of utility model registration request] In a tiller, a horizontal blade part B, which bends and extends in the horizontal direction from the vertical blade part A, is connected to the tip of the vertical blade part, whose blade thickness decreases from the mounting base 1 to the tip, Said vertical blade part A
To form the blade part a of the double-edged surfaces 2 and 3 whose tip is located in the center in the thickness direction of the blade, the blade surface 3 on the outside of the vertical blade part becomes the tip between the mounting base and the tip of the horizontal blade part. The blade surface 2 on the inside of the vertical blade part is formed so that it becomes wider as it approaches the tip from the mounting base to the tip of the horizontal blade part. The cutting edge located at the center in the thickness direction changes to be located at the outer edge in the thickness direction of the blade in the horizontal blade section from the bending start point to the tip, and the cutting edge has a single-edged surface 4 on the inside of the bend. A tiller claw characterized in that the parts are formed continuously.