JPS6312678Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a cutter bar attached to a rotary shaft of a lawn mower.

In the drawing, 1 is a nearly straight bar body;
It has a mounting hole 2 and two stop holes 3, 3 in the center, blade edges 4, 4 are formed on both ends in the direction of rotation, and elongated triangular pieces 6, 6 are bent on the rear side. Three of these cutter bars are lined up at regular intervals, the mounting hole 2 is attached to the rotary shaft of the lawn mower (not shown), the pins are passed through the two stopper holes 3, 3 to prevent rotation, and the cutter bar is rotated clockwise (Fig. 1). Rotate it to cut the lawn short with the blade edges 4 and 4. The above-mentioned structural functions are the same as those known in the art.

In this embodiment, the cutting edges 4, 4 of the cutter bar are formed by forging, thereby making the blades themselves strong, and the cutting edges 5, 5 are punched out by 8 to 4 mm to protrude from the side edge of the bar body 1.

The blade edge of a conventional cutter bar is formed by polishing with a grinder, so not only is the blade itself weak, but the cutting edge is aligned with the side edge of the bar body.
The cutting edge of this cutter bar is prone to wear, so it must be constantly resharpened, and when the cutting edge recedes to near the center line of the bar body, it reaches the end of its life and is discarded. In this embodiment, since the blade edges 4, 4 are formed by forging, the structure thereof is dense, and therefore has high wear resistance and sharpness, and the blade edges 5, 5 protrude from the side edge of the bar body 1. The more you sharpen, the more times you can resharpen, so both of these things work together and the length of use increases considerably.

The above is an explanation of one embodiment of the present invention, and the present invention is not limited to this embodiment, and the design can be changed within the gist of the invention.

According to the present invention, blade edges are formed by forging on both ends of the almost straight bar body in the direction of rotation, and the blade edges are made to protrude from the side edges of the bar body, thereby creating a durable blade. This has the effect of increasing the number of times the cutter bar can be resharpened and extending the period of use of the cutter bar.

[Brief explanation of drawings]

The drawings show an embodiment of the cutter bar according to the present invention; FIG. 1 is a front view of the embodiment, FIG. 2 is a side view thereof, and FIG. 3 is an end view of the cutter bar seen from above. In addition, 1 is the bar body, 4 is the blade edge, 5
is the cutting edge.

Claims (1)

[Scope of utility model claims] A cutter bar characterized in that blade edges are formed by forging on both ends of a straight bar body on the rotational direction side, and the blade edges protrude from the side edges of the bar body.