JPH0127631Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a power brush cutter that consists of a disk that is detachably attached to the rotating shaft of a power brush cutter, and a plurality of single blades that are arranged at equal intervals around the disk. Concerning the improvement of the rotary cutting blade of the machine.

Conventional rotary cutting blades of this type had a single blade fixed to a disk, so if they hit concrete or stone while rotating, the blade would break and pieces would scatter.

This idea was made to eliminate the drawbacks of the conventional rotary cutting blades mentioned above, and it consists of a single blade, a wire rod folded in half and a split pin-shaped blade with a mounting hole in the folded part, and an L-shaped piece. an L-shaped metal fitting having an insertion hole through which the blade passes through, and an L-shaped metal fitting having a through hole matching the attachment hole on the other side, and a bolt that allows this single blade to pass through the attachment hole and the through hole. By attaching it to the disk so that it can rotate freely, we have created a highly safe and inexpensive rotary cutting blade for power brush cutters that will not break and scatter even if the single blade hits concrete or stones while rotating. The purpose is to provide.

An embodiment of this invention will be described below with reference to FIGS. 1 to 3. In the figure, reference numeral 1 denotes a disc that is detachably attached to a rotating shaft (not shown) of a power brush cutter, and has a center hole 1a through which the rotating shaft passes. Reference numeral 2 denotes three single blades arranged at equal intervals around the disk 1, and the blade body 2A is formed into a split pin shape by folding piano wire in half and having a mounting hole 2a in the folded part.
and a through hole 2 having an L-shaped one piece with an insertion hole 2b through which the blade 2A passes, and the other piece having a through hole 2 which matches the attachment hole 2a.
It is composed of an L-shaped metal fitting 2B having a diameter c. 3
is a bolt for rotatably attaching the single blade 2 to the lower surface near the outer periphery of the disk 1, and is fastened to the hole 4 of the disk 1 with a nut 5. A stepped portion 3a is formed at the base of the bolt 3, through which the mounting hole 2a of the blade 2A and the through hole 2c of the L-shaped fitting 2B pass.

When the three single blades 2 are attached to the disk 1, they can each rotate about the stepped portion 3a of the bolt 3 as a fulcrum as shown by the dashed line in FIG. Thus, when the disk 1 is driven, each single blade 2
Both are rotated by centrifugal force so as to protrude in a radial direction, as shown by the solid line in FIG.
Grass or the like is cut by the piano wire of the blade 2A protruding from the disc 1. When this blade body 2A hits concrete or stone, it is rotated by the concrete or stone in a direction that opposes the centrifugal force and escapes.

As described above, according to this invention, when the single blade hits concrete or stone, it rotates by itself and escapes, so even if it hits concrete or stone while rotating, the single blade will not break and scatter, resulting in high safety. In addition, since a wire rod can be used as a single blade, a significant cost reduction can be expected. Furthermore, the single blade is composed of a cotter pin-shaped blade and an L-shaped metal fitting, and the L-shaped metal fitting prevents the cotter-pin-shaped blade from spreading, so the tip of the blade spreads out during work, resulting in pure sharpness. Moreover, since the single blade can be replaced only by replacing the blade body, which is a wire rod, it can be disposable.

In the above example, piano wire is used as the wire, so it can achieve the same sharpness as a knife, but instead of piano wire, something like stainless steel wire may be used, and it is even better than piano wire in terms of sharpness and durability. Although it is inferior, it is also possible to use ordinary wire.

In the above embodiment, three single blades 2 are attached to the back surface of the disk 1 at equal intervals, but any number of single blades 2 may be provided as long as they are equally spaced, and they may be attached to the surface of the disk 1. .

[Brief explanation of the drawing]

FIG. 1 is a back view showing an embodiment of this invention, FIG. 2 is an enlarged cross-sectional view of FIG. 1, and FIG. 3 is an exploded perspective view of the single blade. The same reference numerals in the figures indicate the same or corresponding parts. In the figure, 1 is a disk, 2 is a single blade, 2A is a blade, 2B is an L-shaped fitting, 2a is a mounting hole, 2b is an insertion hole, 2c is a through hole, and 3 is a bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A power brush cutter consisting of a disk that is detachably attached to the rotating shaft of the power brush cutter, and a plurality of single blades arranged at equal intervals around the disk. In the rotary cutting blade, the single blade has a blade body formed into a cotter pin shape by folding a wire rod in half and having a mounting hole in the folded part, and an L-shaped piece having an insertion hole through which the blade body passes, and It is characterized by comprising an L-shaped metal fitting having a through hole that matches the mounting hole in one piece, and the single blade is rotatably attached to the disc by a bolt that can be inserted through the mounting hole and the through hole. The rotary cutting blade of a power brush cutter. 2. The rotary cutting blade for a power brush cutter according to claim 1 of the utility model registration claim, wherein the wire is a piano wire.