JPS5853883B2 - Shivakariki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lawn mower in which a cutting blade provided on a rotary blade that rotates in contact with a fixed blade is made of cemented carbide. To provide a lawn mower which has a special blade shape, has a rotary blade that is inexpensive and robust, and has low noise.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the fixed blade 1 is formed into a disk shape,
A plurality of comb-shaped teeth 2 are provided at intervals on the periphery.

The fixed blade 1 is fixed by screwing a fixed shaft (not shown) into a screw hole 12 of a pillar 11 formed at the center.

The rotary blade 3 has a cutting blade 4 formed at the tip of each of three arms 13 formed radially. The cutting blade 4 is pressed against the comb-shaped teeth 2 of the fixed blade 1, the rotary blade 3 is rotated by a drive shaft (not shown), and the grass is mowed by the comb-shaped teeth 2 and the cutting blade 4.

As shown in FIGS. 2 to 4, each arm 1 of the rotary blade 3
A cutting blade 4 made of cemented carbide is fixed to the back surface of the tip of the blade 3.

The cutting edge 4 has an abbreviated rib 10 consisting of a first side 8 and a second side 9 extending in a direction intersecting the first side 8, on two side edges of a substantially triangular substrate 5. An L-shaped rib 10 is integrally formed so as to protrude from the front surface 6 of the substrate 5, and the back surface 7 of the substrate 5 is fixed to the back surface of each of the arms 13. Side 8 of 1 is rotating blade 3
, and the first side 8 is substantially parallel to the rotation direction of the rotary blade 3 .

The first side 8 is a rotary blade whose length B is equal to or greater than the distance A between the adjacent comb-shaped teeth 2, 2 on the rotation trajectory S of the first side 8. 3 installation error or when the rotary blade 3 is tilted when mowing the lawn.
Make sure that the side 8 does not fall between the comb-shaped teeth 2, 2,
This prevents noise and reduces sharpness.

The lawn mower of the present invention has a disk-shaped fixed blade provided with a plurality of comb-shaped teeth at intervals on its circumference, and a rotary blade provided with a cutting blade that rotates in contact with the comb-shaped teeth of the fixed blade. A lawn mower having a first side having a length equal to or longer than the spacing between the teeth of the comb, and a second side extending in a direction intersecting the first side. A rotary blade with a letter-shaped cutting blade made of cemented carbide positioned in the circumferential direction of the tip of the first edge of the comb-shaped teeth and with the second edge facing the adjacent comb-shaped teeth. Since the cutting edge is fixed to the fixed blade more firmly than the case where only the second side is fixed to the back surface of the tip of the rotary blade, the cutting edge has comb-shaped teeth. This has the effect of being less likely to fall in between, making less noise and giving a good cutting edge.Also, the leading edge of the cutting edge, which is most susceptible to impact from foreign objects such as pebbles, is fixed to the rotating blade over the widest area. Therefore, it is mechanically stable and has the effect of saving the material of the cutting blade.Furthermore, since only the ribs of the incisor teeth are in contact with the comb-shaped teeth of the fixed blade, the ribs are Compared to the case where no blade is formed, the contact area is reduced, resulting in a lawn mower with less negative impact and better cutting ability.

[Brief explanation of the drawing]

The drawings show an embodiment of the lawn mower of the present invention, and FIG. 1 is a perspective view of the fixed blade, rotary blade, and coil spring, and FIG. 2 shows the relationship between the fixed blade and the rotary blade of the lawn mower. 3 is a partially enlarged perspective view showing the back side of the rotary blade in the lawn mower, and FIG. 4 is an exploded partially enlarged perspective view of the rotary blade shown in FIG. 3. 1...Fixed blade, 2...Comb-shaped teeth, 3
...Rotary blade, 4...Rotary blade cutting edge, 8
......First side of the cutting blade, 9......Second side of the cutting blade.

Claims (1)

[Claims] 1. In a lawn mower having a disk-shaped fixed blade with a plurality of comb-shaped teeth provided at intervals on its periphery, and a rotary blade provided with a cutting blade that rotates in contact with the comb-shaped teeth of the fixed blade. , a cemented carbide having an abbreviated shape, with a first side having a length equal to or longer than the interval between the teeth of the comb, and a second side extending in a direction intersecting the first side. A cutting edge composed of: is provided on the rotary blade so that it is located in the circumferential direction of the tip of the first side comb-shaped teeth, and the second side faces the adjacent comb-shaped teeth. Lawn mower.