JP2585384Y2 - Rotary blade for mowing - Google Patents

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 for an electric mower.

[0002]

2. Description of the Related Art An electric mower used for mowing a bank, a shore, or a forest is provided with a rotary blade so that the grass is cut by rotating the rotary blade. There are known those in which a normal blade or a carbide tip blade formed by quenching the edge of a disc at the portion is used. Also, the mowing blade may come into contact with stones or the like during the work and receive a strong impact.

As a countermeasure against the above-mentioned problem, in the case of using a carbide tip blade, as described in Japanese Utility Model Application Laid-Open No. 62-136131, the mounting surface of the carbide tip to the blade plate is inclined. Alternatively, as described in Japanese Utility Model Publication No. 3-23055, means for preventing the chip from falling off when receiving an impact by setting the angle of attachment of the carbide tip to the blade plate at a specific angle has been proposed. .

[0004] Japanese Utility Model Publication No. 1-337379 discloses a mowing blade provided with a guard portion which approximately coincides with the outer peripheral position of the cutting edge.

[0005]

The above-mentioned measures against breakage of the mowing rotary blade are measures against direct impact on the tip blade with a tip blade, and are no measures against strong impact. Not.

The means for providing a guard portion in the outer peripheral direction of the rotary blade plate only prevents the pebbles or the like from being caught in the direction of the cutting progress of the rotary blade, and prevents the pebbles or the like from approaching the ground side of the rotary blade. Entanglement has not been prevented. Entanglement of pebbles and the like occurs more frequently when approaching the ground side.
Therefore, the present invention proposes a rotary blade for a mower equipped with a guard portion in the axial direction of the rotary blade.

[0007]

A rotary blade for a mower according to the present invention has a circular blade plate in which a concave portion is formed intermittently on an outer peripheral portion, and a cutting blade portion is provided on an edge portion facing the rotational direction of the concave portion. A guard portion is formed by protruding the edge of the opposing concave portion of the cutting blade portion above the lowermost surface of the cutting blade portion located on the lower side during use.

[0008]

When the rotating blade is inserted into the grass while rotating, the grass that has entered the concave portion of the circular blade plate is cut by the cutting blade.
Therefore, the grass is cut by the advance of the rotary blade.

Further, even when the rotating blade approaches the ground and comes into contact with pebbles, the rotating blade comes into contact with the guard portion below the cutting blade portion, is pushed downward by the guard portion, and does not come into contact with the cutting blade portion. Therefore, damage to the cutting blade does not occur.

[0010]

Next, an embodiment of the present invention will be described. The rotary blade for a mower according to the present invention is provided with an appropriate rotary shaft mounting portion (through hole 1) at the center of the circular blade plate A, and a concave portion 2 is formed intermittently on the outer peripheral portion. The cutting blade portion 3 and the guard portion 4 are provided in the portion, and the cutting blade portion 3 is formed by brazing a carbide tip blade to an edge of the concave portion 2 facing the rotation direction. The guard portion 4 is formed by projecting a concave edge opposed to the cutting blade portion 3 above the lowermost surface of the cutting blade portion located on the lower side during use.

The rotary blade (blade plate A) is mounted on a mowing machine and used for mowing. When the rotary blade is inserted into the grass while rotating, the grass that has entered the concave portion 2 of the circular blade plate A is removed. The cutting is performed by the cutting blade portion 3, and desired mowing can be realized by moving the rotary blade (blade plate A).

Further, since the rotary blade (blade plate A) of the present invention has the guard portion 4, even if the rotary blade (blade plate A) approaches the ground and comes into contact with pebbles during mowing work. Since the guard portion 4 below the cutting blade portion 3 comes into contact with pebbles and the like, the pebbles and the like are pushed to the ground side by the guard portion 4, and the pebbles and the like do not come into contact with the cutting blade portion 3, so the cutting blade portion 3 is hardly damaged.

It should be noted that the present invention is not limited to the one having a cutting blade portion using a carbide tip as in the above embodiment, but may be one having a cutting blade portion formed by a normal hardening blade. The guard portion may also protrude in the outer peripheral direction until it coincides with the outer peripheral portion of the cutting blade portion.

[0014]

[Effects of the Invention] As described above, the present invention is characterized in that a guard portion protruding in the axial direction of the rotary blade is provided, thereby preventing pebbles and the like from being entangled by approaching the ground during use. Thus, damage to the cutting blade can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a perspective view of the main part.

[Explanation of symbols]

 2 recess 3 cutting blade 4 guard

Claims (1)

(57) [Scope of request for utility model registration] 1. A concave portion is intermittently formed in an outer peripheral portion of a circular blade plate, a cutting blade portion is provided at an edge portion facing the rotating direction of the concave portion, and an opposing concave edge of the cutting blade portion is lowered downward when used. A rotary blade for mowing, wherein a guard portion is formed by projecting more than the lowermost surface of the cutting blade portion on the side where the cutting blade portion is located.