JPS6335215B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reel blade for an electric lawn mower.

In the case of a conventional lawn mower reel blade, both ends of a twisted blade 5' are attached to a blade support plate 2' as shown in Fig. 1, but this blade 5' has a rake angle. The cutting edge was not formed, the cutting quality was dull and the cutting life was short.

The present invention has been made in view of the drawbacks of the conventional examples described above, and its purpose is to improve the cutting quality by providing a rake angle to the blade by using a concave groove at the cutting edge. Moreover, it is an object of the present invention to provide a reel blade for an electric lawn mower that is difficult to attract grass juice and the like.

The present invention will be explained in detail below with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, the lawn mower consists of a main body 10, a handle 11, and a grass basket 12.

The main body 10 includes a motor 1 in a main body housing 13.
4. Reel blade 15, fixed blade 20, drive transmission mechanism 16 that transmits the power of the motor 14 to the reel blade 15;
It is configured with built-in running wheels 17, and has a mowing height adjustment mechanism 19 that adjusts the mowing height of the lawn by adjusting the height of the running wheels 17 by operating a mowing height adjustment lever 18. Operate 22 to set fixed blade 2.
The reel blade 15 has a gap adjustment mechanism 21 that adjusts the distance between the reel blade 15 and the reel blade 15. The handle 11 includes a power cord 23, a switch 24, a grip portion 25, and the like. Further, the grass collection basket 12 is used to collect grass clippings during lawn mowing, and is attached to the rear part of the main body housing 13.

As shown in FIG. 4, the reel blade 15 is rotatably supported at both ends of the reel shaft 1 by bearings 26, and the rotation of the motor 14 is transmitted to the reel shaft by a drive transmission mechanism 16 such as a pulley, belt, or gear. 1 and is rotated. A disk-shaped stationary plate 27 is fixed to both ends of the reel shaft 1 by welding or the like so as to be perpendicular to and concentric with the reel shaft 1. The blade support plate 2 has its base end fixed to a fixed plate 27 with screws with a predetermined angle shift at both ends of the reel shaft 1 in response to the twist of the blade 5, and the blade attachment plate is attached to the tip of the blade support plate 2. A surface 3 is formed, and a male threaded portion 4 is vertically protruded from the blade mounting surface 3. As shown in FIGS. 5 and 6, the blade 5 has through-holes 6 at both ends, and is twisted in a smooth helical manner as a whole to form an angle (approximately 20 mm) between the blade 5 and the fixed blade 20.゜). Furthermore, a V-shaped concave groove 8 is cut out in the cutting edge portion 28 of the blade 5 along the cutting edge, thereby forming a rake angle θ (<90°) at the cutting edge of the blade 5 and a cutting edge angle at the cutting edge. α (<90°) is marked. Thus, the blade 5 is inserted into the through hole 6 with the male threaded part 4, and the blade 5 surface is attached to the blade mounting surface 3.
It is attached by tightening a nut 7 to the externally threaded portion 4, and the rake angle θ of the blade 5 improves the sharpness when mowing the lawn.

Note that the concave groove 8 of the cutting edge portion 28 may be provided only on the surface side of the blade 5 (front side in the rotational direction of the reel blade);
If grooves 8 are provided on both the front and back surfaces to give a rake angle θ, the cutting edge angle on the back side can also be effectively utilized by attaching the blade 5 to the blade support plate 2 with the front and back sides reversed.

The blade shown in FIG. 8 is another example of the blade of the present invention, in which a plurality of grooves 9 are notched on the surface of the blade 5 in the width direction of the blade 5 from the back 29 of the blade 5 toward the cutting edge 28. , the groove 8 and the groove 9 are made to communicate with each other. In this way, by providing the grooves 9, adhesion of grass debris, grass juice, etc. to the blade 5 during lawn mowing is prevented by being discharged by the grooves 9, and the cutting life can be improved. It is.
Furthermore, when the cut grass is discharged by centrifugal force caused by the rotation of the reel blade 15, it can be discharged in a uniform direction along the grooves 9.

Since the present invention is constructed as described above, the cutting edge of the blade has a rake angle, and the cutting edge is sharp so that grass can be cut sharply, and there is an advantage that the cutting quality and cutting life are improved.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the conventional example, Fig. 2 is a perspective view showing an embodiment of the present invention, Fig. 3 is a longitudinal sectional view of the same, Fig. 4 is a side sectional view of the same, and Fig. 5 is a side sectional view of the same. A partially broken exploded perspective view showing the reel blade same as above, Fig. 6 is a perspective view showing the same blade as above, Fig. 7 is a sectional view taken along line XX in Fig. 6, and Fig. 8 shows another example of the blade. The perspective view, FIG. 9, is a YY sectional view of FIG. 8. 2...Blade support plate, 5...Blade, 8...
... Concave groove, 15 ... Reel blade, 20 ... Fixed blade, 2
8...Blade tip.

Claims (1)

[Claims] 1. In a reel blade that rotates at a distance from a fixed blade, a rake angle is formed at the blade edge by cutting out a concave groove along the edge of the blade that is twisted and attached to the blade support plate. An electric lawn mower reel blade featuring: