JPH08103136A - Mowing rotary edge - Google Patents

Abstract

PURPOSE: To provide a mowing rotary edge imparted with special structure with resultant significantly prolonged the operating life thereof. CONSTITUTION: The outer periphery of a circular edge plate 1 is intermittently provided with inversely tapered non-rectangular recesses 13, which are then tightly engaged with carbide chips 2 each with double-edged tip to enable cutting in both directions and to prevent these chips from slipping off the edge plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary blade used in an electric mower.

[0002]

2. Description of the Related Art Electric mowers used for cutting banks, banks, forests, etc. are equipped with rotary blades so that the rotary blades rotate to cut grass. It is known that a part of the disk is formed with a normal blade hardened at the edge of a disk or a carbide tip blade.

Particularly, in the case of adopting a cemented carbide chip body, the outer peripheral portion of the blade plate is corrugated, and the chip body is brazed to the tip facing in the direction of rotation. Further, since the mowing blade may come into contact with stones or the like during the work and receive a strong impact, it is necessary to take appropriate measures so as not to cause damage to the blade, as disclosed in Japanese Utility Model Laid-Open No. 62-136131. As described, the mounting surface of the cemented carbide tip to the blade plate is inclined, or the mounting angle of the cemented carbide tip to the blade plate is specified as described in Japanese Utility Model Publication No. 3-23055. By setting the angle, as shown in Japanese Utility Model Laid-Open No. Sho 60-194419, the base of the tip body is made wide and is attached to the blade plate by fitting so as to prevent the centrifugal force direction from coming off due to rotation of the blade plate. A means for preventing the chip from falling off when it receives a shock has been proposed.

[0004]

As means for preventing separation of a cemented carbide tip body from a blade plate, the blade body is fitted by widening the base portion of the chip body to prevent the blade body from coming off in the direction of centrifugal force due to rotation of the blade plate. However, in the above-mentioned conventional example, the base of the chip body is rectangular, and if a shock is applied during use, a crack will be generated immediately from the corner of the fitting recess of the blade plate. Further, the chip body is fitted laterally into the blade plate, but in that case, unless the cutting lines of the chip body are aligned in the rotational direction, the rotary blade has poor sharpness.

In addition, since the rotary cutting direction of the conventional rotary blade in which a carbide tip is mounted on the outer peripheral portion of the blade plate is fixed in the rotary cutting direction, if the front and back surfaces of the rotary blade are erroneous, the grass cutting operation cannot be performed at all and the attachment and detachment is redone. There is a need. Further, when the carbide tip body is worn out, it is necessary to replace the rotary blade. Therefore, the present invention proposes a rotary blade for mowing, which does not separate the cemented carbide tip body and has a cutting function in both rotation directions.

[0006]

In the rotary blade for mowing according to the present invention, a non-rectangular concave portion with a widened back is intermittently formed on the outer peripheral portion of a circular blade plate, and the base portion is closely fitted to the concave portion. It is characterized in that a cemented carbide chip body having a tip shape formed on both blades is attached to the concave portion so as to fit together.

Further, particularly in the above-mentioned rotary blade for mowing,
The cemented carbide tip body is formed with double-edged blades on the front and back edges that are protruded from the thickness of the blade plate to the front and back edges, and between the protrusions of the cemented carbide tip body,
Providing a blade plate protrusion corresponding to the protrusion of the chip body, and the base part of the cemented carbide chip body, the back surface side is a tapered end surface that is easy to insert into the blade plate recess, and the front surface side is a paragraph part that does not penetrate the recess It is a feature.

[0008]

[Function] When the rotary blade is rotated and inserted into the grass turf, it is cut by the rotating carbide tip body. Moreover, since the cemented carbide chip body has double-edged blades, it can be cut in any rotation direction. Further, since the cemented carbide chip body is fitted in the recessed portion of the outer peripheral portion of the blade plate which is widened at the inner side, the cemented carbide chip body does not separate from the blade plate even if an impact is received during its use.

In particular, in order to mount the cemented carbide chip body in the recess as described above, it is necessary to fit the blade plate in the lateral direction, but the front and back of the base of the cemented carbide chip body are respectively tapered end faces and paragraphs. Then, at the time of fitting from the lateral direction, the paragraph portion comes into contact with the blade plate surface to be always mounted at a fixed position. Further, by making the base of the cemented carbide chip body non-rectangular, the occurrence of cracks in the blade plate can be reduced.

[0010]

EXAMPLES Next, examples of the present invention will be described. <First Embodiment> FIGS. 1 to 4 show a first embodiment of the present invention. In this embodiment, a blade plate 1 and a cemented carbide tip body 2 are used similarly to the conventional tip-type rotary blade for mowing. Composed of and.

The blade plate 1 is a main body 1 made of a circular metal plate.
An appropriate rotary shaft mounting portion (through hole) 12 is provided at the center of the first and concave portions 13 are intermittently formed on the outer peripheral portion at regular intervals. In particular, the concave portion 13 has a width b that is deeper than the width a of the entrance portion, and the sled shape is formed in a non-rectangular shape such as an elliptical shape that is bilaterally symmetrical.

In the cemented carbide chip body 2, the base portion 21 has the recess 1
3 has a shape to be closely fitted, and the edge on the back surface side is a tapered surface 22, and a paragraph portion 23 wider than the concave portion 13 is formed on the edge on the front surface side, and a blade portion 24 is formed at the tip portion. Formed,
The blade portion 24 has both left and right blades, and a blade tip is formed in the center of the front and back.

The cemented carbide chip body 2 is for press-fitting from the front surface side of the blade plate 1 into the recess 13 and tightly fitting the base portion 21 thereof. Particularly, the back surface side edge of the chip body 2 is a tapered surface. Therefore, the press-fitting can be easily carried out, and the front side paragraph portion 23 acts as a stopper for the press-fitting into the recessed portion 13, so that the cemented carbide chip body 2 can be easily placed at a position accurately aligned in the rotation direction. It can be attached to.

After the base portion 21 of the cemented carbide chip body 2 is fitted in the recess 13 in this manner, the cemented carbide chip body 2 is brazed to the blade plate 1. Since the gap with the base portion 21 is very narrow, the molten metal wax intrudes into the gap by the capillary phenomenon and is solidified, and the brazing strength is also increased. Moreover, since the recess 13 has a shape in which the back is widened, the cemented carbide chip body 2 does not separate from the blade plate 1 even if a slight shock is applied during use.

The rotary blade is used by being mounted on a predetermined electric mower, and since the cemented carbide tip body 2 is a double blade, the cutting action is exerted in any rotation direction, and the equipment is It is not necessary to check the front and back of the rotary blade when attaching a new rotary blade to the, and when worn, it can be used further by turning the front and back of the blade up and down. Therefore, doubling the product life has the same effect.

<Second Embodiment> FIGS. 5 to 8 show a second embodiment of the present invention. This embodiment also comprises a blade plate 1a and a cemented carbide tip body 2a as in the first embodiment. , Blade 1a
The base portion 21 of the cemented carbide chip body 2a is tightly fitted and mounted in the concave portion 13 formed in the outer peripheral portion of the blade plate 1a. In addition, a blade plate protrusion 14 is provided corresponding to the protrusion of the carbide tip body 2a. When the blade plate protrusion 14 collides with a hard object such as a stone during mowing work, the blade plate is repelled by the rotational force of the blade plate to prevent chipping of the cemented carbide chip body 2a due to collision of the cemented carbide chip body 2a. Is.

Further, the blade portions 24a of the cemented carbide chip body 2a are formed on the left and right edges of the cemented carbide chip body 2a, and are alternately mounted so that the blades are different from each other in the same manner as in the conventional chip body mounting. It is a thing.

The present invention is not limited to the above-mentioned embodiment, and the double-edged cemented carbide chip body is fitted tightly in a recess having a non-rectangular shape formed on a blade plate and having a wide inner side. The shape of both blades and the shape of the recess can be arbitrarily determined.

[0019]

Industrial Applicability As described above, according to the present invention, a non-rectangular concave portion having a wide inner side is intermittently formed on the outer peripheral portion of a circular blade plate, and the concave portion is formed with a cemented carbide tip having a double-edged tip. The body is fitted tightly to prevent the carbide tip body from coming off the blade plate, and by replacing the front and back and mounting them on an electric mower, both front and back sides can be used, resulting in a product lifespan. Is significantly improved.

[Brief description of drawings]

FIG. 1 is a partial front view of a first embodiment of the present invention.

FIG. 2 is an enlarged front view of the first embodiment.

FIG. 3 is an enlarged partial plan view of the first embodiment.

FIG. 4 is an enlarged sectional view of the first embodiment.

FIG. 5 is a partial front view of the second embodiment of the present invention.

FIG. 6 is an enlarged front view of the second embodiment.

FIG. 7 is an enlarged partial plan view of the second embodiment.

FIG. 8 is an enlarged sectional view of the second embodiment.

[Explanation of symbols]

 1, 1a Blade plate 11 Main body 12 Rotating shaft mounting portion (through hole) 13 Recessed portion 14 Blade plate projection portion 2, 2a Carbide chip body 21 Base portion 22 Tapered surface 23 Paragraph portion 24, 24a Blade portion

Claims (3)

[Claims] 1. A non-rectangular recess having a widened inner side is intermittently formed on the outer peripheral portion of a circular blade plate, and a base portion is shaped to be closely fitted to the recess portion, and a tip portion is formed on both blades. A rotary blade for mowing, comprising a hard tip body mounted in the recess. 2. The rotary blade for mowing according to claim 1, wherein the cemented carbide tip body is made into a double-edged blade by forming the blades on the front and back edges projecting from the thickness of the blade plate to the front and back sides. A rotary blade for mowing, characterized in that a blade plate protrusion corresponding to the protrusion of the tip body is provided between the protrusions. 3. The rotary blade for mowing according to claim 1 or 2, wherein the base portion of the cemented carbide tip body has a taper end surface whose back surface side is easily inserted into the blade plate recess, and a front surface side which does not penetrate the recess. A rotary blade for mowing characterized by