JPH0871843A - Tipped saw for mowing machine - Google Patents

Abstract

PURPOSE: To provide a tipped saw for a mowing machine which can mow grass and the like efficiently while making the tipped saw lightweight. CONSTITUTION: In a tipped saw 10 for the mowing machine, plural opening parts 18a-18d are partitioned in a disc like base metal 14, and cutting edge parts 20 are formed at the specified parts of the opening parts 18a-18d. In mowing work or the like, grass, ivy and the like clinging to the opening parts 18a-18d are thereby cut by the cutting parts 20, so that grass and the like are hindered from clinging to the disc like base metal 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip saw for use in a brush cutter, in which a large number of tips are planted on a peripheral edge of a disc-shaped base metal with a predetermined distance therebetween.

[0002]

2. Description of the Related Art Generally, a disc tip saw in which a large number of cutting chips (hereinafter, simply referred to as "tips") are alternately implanted at a peripheral portion of a disc-shaped base metal is used. ing. The disc tip saw is used, for example, in a brush cutter used for mowing, and the disc base metal and a large number of tips made of a hard alloy are formed as separate bodies, and the two are joined by brazing or the like. Formed. The brush cutter is a machine that rotates a small-diameter disk tip saw under the action of a portable engine to brush off bamboo grass, weeds, and the like.

In this case, each tip is in the form of a rod having a square cross section with a pointed tip. For example, in the case of a mowing disc tip saw used for mowing, the longitudinal direction of the tip extends from the radial direction of the disc toward the rotational direction. And is implanted at the peripheral edge of the disc-shaped base metal so as to form an inclination of about 45 °.

Now, based on FIGS. 3A and 3B,
The shape of the chip will be described.

Chip 2 (hereinafter referred to as chip 2 if necessary)
a and 2b) has a tip surface 4 located outside the disk-shaped base metal 9 and a rake surface 6 located inside the disk-shaped base metal 9 and each having a predetermined angle with the upper and lower surfaces of the chip 2. Are formed. When the chip 2 is implanted in the disk-shaped base metal 9, both surfaces are substantially orthogonal to the disk surface, and the both surfaces intersect at an angle of about 90 °. The ridge line 8 that is the boundary is the chip 2
Is located almost at the center of the thickness of the chip and forms the cutting edge of the chip 2.

The chip 2 is usually cast,
After being implanted in the peripheral portion of the disc-shaped base metal 9, the tip surface 4
By cutting the rake face 6 and the rake face 6, sharpness is imparted to the ridge line 8 and the right tooth tip 2a and the left tooth tip 2b which are line-symmetrical with the disc surface as the axis of symmetry are formed.

[0007]

By the way, in the case of performing the mowing work with the above-mentioned brush cutter, the operator supports the brush cutter main body to which the portable engine is attached by shoulders or the like,
An arm having a disk tip saw rotatably supported at its tip is manually operated, and the arm is swung under the rotating action of the disk tip saw to cut grass.

Therefore, there is a demand to reduce the weight of the disc tip saw used in the brush cutter as much as possible to improve the operability of the arm and reduce the fatigue load on the operator.

As means for satisfying the above-mentioned demand, it has been proposed to provide a disc-shaped base metal with an opening having an arbitrary shape. However, when the opening is provided in the disk-shaped base metal, when cutting grass, grass to be mowed, vines or the like is wrapped around the disk-shaped base metal through the opening, or entangled, There is an inconvenience that it is not possible to efficiently mow grass and the like.

The present invention has been made in order to overcome the above-mentioned inconvenience, and aims to reduce the weight of a tip saw used in a brush cutter and to efficiently brush grass and the like. The purpose is to provide a tip saw for use.

[0011]

In order to achieve the above object, the present invention is used in a brush cutter, and a large number of chips are implanted in a peripheral portion of a disc-shaped base metal at predetermined intervals. The tip saw is characterized in that an opening having an arbitrary shape is defined on the disk-shaped base metal, and a cutting blade portion is formed on the base metal defining the opening.

[0012]

In the tip saw for a brush cutter according to the present invention, an opening having an arbitrary shape is defined in a disc-shaped base metal, and a cutting blade portion is formed in the base metal in which the opening is defined. . Therefore, in mowing work or the like, grass, ivy or the like that is entangled in the opening can be cut by the cutting edge portion to prevent grass or the like from entwining the base metal, and the mowing work can be efficiently performed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a tip saw for a brush cutter according to the present invention will be described in detail below with reference to the accompanying drawings by way of preferred embodiments.

FIG. 1 is a side view of a tip saw for a brush cutter according to an embodiment of the present invention.

The tip cutter 10 for a brush cutter (hereinafter referred to as a tip saw) is basically pivotally supported by an arm (not shown) through a central hole 12 and is driven by a portable engine provided in the brush cutter body. A disk-shaped base metal 14 (hereinafter, referred to as a disk) that rotates in the direction of arrow A around the center hole 12 and a plurality of chips 16 that are implanted in the peripheral edge of the disk 14 at a predetermined interval. Composed of and. Since the chip 16 has substantially the same structure as the chip 2 shown in the prior art of FIGS. 3A and 3B, detailed description thereof will be omitted.

Between the peripheral edge of the disk 14 and the center hole 12, a plurality of openings 18a to 18d having substantially the same shape are arranged in substantially the same circumference. Each of the openings 18
A cutting edge portion 20 having a cutting edge ridge 19 inclined by a predetermined angle C with respect to the radial direction B is formed at predetermined portions a to 18d. The predetermined angle C is preferably in the range of 3 ° to 25 °. The cutting edge portion 20 is formed by punching and grinding as described later.

The tip saw 10 according to the embodiment of the present invention is basically constructed as described above. Next, the function and effect of the tip saw 10 will be described based on the manufacturing process of the tip saw 10.

First, the die 2 is attached through fixing means (not shown).
2. Fix the disc 14 on top of it (see FIG. 2A). in this case,
A hole portion 26 for inserting the punching punch 24 is defined in the die 22, and an inner wall surface of the hole portion 26 is formed with an inclined portion 28 inclined by a predetermined angle over a predetermined range. With the disk 14 fixed in this way, the punching punch 24 is displaced in the direction of the arrow along the inner wall surface of the hole 26 under the driving action of a drive source (not shown).
A plurality of openings 18 having a predetermined shape are punched out from the disc 14.

At this time, the inner peripheral end portion of the opening 18 of the punched disk 14 is formed by being bent inward along the inclined portion 28 of the die 22 (see FIG. 2B). Part 30
The cutting edge portion 20 having the sharp cutting edge ridge 19 is formed by subjecting the cutting edge portion to grinding. After the cutting edge portion 20 is formed in the plurality of openings 18a to 18d as described above,
A large number of chips 16 are provided along the peripheral edge of the disk 14 with a predetermined space therebetween
Implant, braze and join. After the tip saw 10 is formed in this manner, the tip saw 10 is rotatably assembled to the arm connected to the main body of the brush cutter to complete the brush cutter.

In the tip saw 10 according to this embodiment, the weight of the tip saw 10 can be reduced by defining the plurality of openings 18a to 18d, the operability of the tip saw 10 by the arm is improved, and the operator It is possible to reduce the fatigue burden on the.

Further, a cutting blade portion 20 is formed at a predetermined portion of each of the openings 18a to 18d, and each of the openings 18a to 18d is formed.
It is possible to easily cut grass, ivy, etc. entwined with 18d by the cutting edge 19 and prevent grass, ivy, etc. from getting entangled in the disc 14 and efficiently perform mowing work.

In this embodiment, the shapes of the openings 18a to 18d defined in the disc 14 are substantially parallelogrammic,
Although the number is described as four, it goes without saying that the shape and number of the openings are not limited to this.

[0023]

According to the tip saw for the brush cutter of the present invention,
By defining the opening in the disc-shaped base metal, the weight of the tip saw can be reduced, the operability of the tip saw by the arm can be improved, and the fatigue load on the operator can be reduced. .

Further, a cutting blade portion is formed in each of the predetermined portions of the opening, and grass, ivy or the like entwined with the opening can be easily cut by a cutting edge, and grass is attached to the base metal.
It is possible to prevent the vines from being entangled with each other and efficiently carry out the mowing work.

[Brief description of drawings]

FIG. 1 is a side view of a tip saw for a brush cutter according to an embodiment of the present invention.

2A to 2C are explanatory views showing a manufacturing process of the tip saw for a brush cutter of FIG. 1.

FIG. 3A and FIG. 3B are explanatory views of a tip to be implanted in a peripheral edge portion of a disc-shaped base metal which constitutes a tip saw for a brush cutter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Tip saw for brush cutter 12 ... Center hole 14 ... Disc base metal 16 ... Chips 18a-18d ... Opening 19 ... Cutting edge 20 ... Cutting edge 22 ... Die 24 ... Punch for punch 26 ... Hole 28 ... Inclined part 30 ... Bent part

Claims (2)

[Claims] 1. A tip saw for use in a brush cutter, wherein a large number of chips are planted at a peripheral portion of a disc-shaped base metal at predetermined intervals, the disc-shaped base metal having an arbitrary shape. To define the opening
A cutting saw for a brush cutter, wherein a cutting blade portion is formed on a base metal that defines the opening. 2. The cutting blade according to claim 1, wherein the disk-shaped base metal is formed with a plurality of openings of substantially the same shape along the same circumferential shape to form a cutting edge portion. A tip saw for a brush cutter, wherein the ridge is formed to be inclined at a predetermined angle with respect to the radial direction of the base metal.