JP3181616U - Chip saw for brush cutter - Google Patents

Abstract

There is provided a tip saw for a brush cutter which is excellent in workability, prevents mud from adhering to a mounting bolt on a bottom surface and has an excellent cutting force.
A short cylindrical portion 3 having a flat upper surface 3a is formed in a central portion of a blade plate 1, and a mounting hole 2 is formed in a central portion of the upper surface 3a. A projecting portion 4 having a relatively large rounded surface and a circular shape in plan view is formed at the lower end of the short cylindrical portion 3, and an inclined surface 5 is formed continuously outward from the projecting portion 4. The upper end of the inclined surface 5 is bent in the horizontal direction to form the outer peripheral plate portion 6, and a large number of tooth molds for joining the chips 7 to the outer peripheral edge of the outer peripheral plate portion 6 are formed. The upper surface 3a of the short cylindrical portion 3 and the upper surface of the outer peripheral flat plate portion 6 are preferably located on the same plane.
[Selection] Figure 1

Description

  The present invention relates to a chip saw for a brush cutter, which is a rotary blade that is attached to a brush cutter that is driven to rotate at a high speed and performs cutting of weeds and shrubs.

In general, a conventional chip saw for a brush cutter has chips arranged on the outer peripheral edge of a flat disk. In order to mount the disc-shaped tip saw on the rotary drive unit of the brush cutter, the tip saw is arranged at a predetermined position of the rotary drive unit and fixed with a bolt. At this time, a cup-shaped cover is attached so that mud does not adhere to the bolts and nuts protruding from the bottom surface of the center. This cup-shaped cover functions as a sliding member, and by moving the tip saw by grounding and sliding the cover, it is possible to perform the brushing operation smoothly.
With conventional tip saws, the cup-shaped cover attached to the bottom surface is easily damaged, and when the cover is damaged or when the work is performed without attaching the cover, it is inconvenient to handle because mud adheres to the mounting bolts. is there.

  As a tip saw other than the planar shape, Patent Document 1 discloses the idea of a tip saw that is formed in a bowl shape as a whole. Patent Document 2 discloses the idea of forming a corrugated blade plate from the center hole outward in the radial direction and forming an upward annular convex portion and a downward annular convex portion. Patent Document 3 discloses a cutting blade. The idea of joining an annular body to the upper surface or the lower surface is disclosed.

JP 2001-86832 A Utility Model Registration No. 3124220 JP 2012-55230 A

In Patent Document 1, the entire grass is formed in a bowl shape for the purpose of preventing the cut grass from winding around the rotating shaft. Since the tip saw is moved in the horizontal direction, there is a drawback that cutting action such as weeds is difficult. Therefore, when the mowing work is performed, the tip saw is tilted obliquely.
The tip saw disclosed in Patent Document 2 improves strength by forming an upward annular convex portion and a downward annular convex portion, thereby reducing the weight. For example, the blade portion (tip) is slanted. Since it is inclined upward, there is a disadvantage that it is inconvenient for the mowing work. Further, in the case where the annular body is fixed to the surface of the brush cutting blade described in Patent Document 3, there is a risk that the annular body itself may fall off while requiring a lot of manufacturing.

  In view of the above disadvantages of the prior art, the present invention is excellent in operability for moving the tip saw in the mowing operation, and mud etc. are less likely to adhere to the mounting bolt portion at the center of the tip saw back surface, and maintenance management is easy. The purpose of the present invention is to realize a chip saw for a brush cutter that is excellent in operability of shrub cutting work and exhibits an excellent cutting function.

In order to achieve the above object, according to the first aspect of the present invention, a short cylindrical portion 3 having a flat upper surface 3a is formed in the central portion of the blade plate 1. A mounting hole 2 is formed in the upper surface 3a of the short cylindrical portion 3, and a circular protrusion 4 is formed with a relatively large rounded surface at the lower end.
An inclined surface 5 is formed continuously outward from the circular projecting portion 4 and the upper end of the inclined surface 5 is bent in the horizontal direction to form the outer peripheral flat plate portion 6. Then, a large number of tooth molds 8 for joining the chips 7 to the outer peripheral edge of the outer peripheral flat plate portion 6 are formed.

The idea of claim 2 is that the upper surface 3a of the short cylindrical portion 3 formed in the central portion and the upper surface of the outer peripheral flat plate portion 6 are positioned on the same plane.
The invention described in claim 3 is to make the width of the outer peripheral flat plate portion 6 equal to or larger than the width at which the entire tooth mold 8 including the galette 9 for taking in the workpiece A is formed on a plane.
The invention described in claim 4 is to form a plurality of through holes 10 in the range of the inclined surface 5 of the blade plate 1.

According to the first aspect of the present invention, when the tip saw according to the present invention is attached to the rotational drive portion of the brush cutter 11 and the brush cutting operation is performed, the protruding portion 4 of the blade plate 1 is moved as shown in FIG. When the ground is brought close to the workpiece A, since the tooth mold 8 is oriented in the horizontal direction, for example, the upright workpiece A can be cut at a right angle. For this reason, a to-be-cut object can be cut | disconnected reliably.
At this time, the mounting bolt 12 protruding from the back surface of the blade plate 1 is located inside the short cylindrical portion 3, that is, surrounded by the protruding portion 4, and does not reach the ground surface. There is little possibility of adhering, and since the mounting bolt 12 is not grounded, the blade plate can be moved smoothly and cutting work can be performed efficiently.

  According to the second aspect of the present invention, the upper surface of the short cylindrical portion formed in the central portion and the upper surface of the outer peripheral flat plate portion are located on the same plane. Or the bending stress which goes to a lower surface does not act, and a cutting operation can be performed effectively. In the case of a conventional saddle-shaped tip saw, since the attachment position of the blade plate and the action position of the cutting force are shifted vertically, an upward bending stress acts and the cutting action is not stable.

According to the third aspect of the present invention, since the force and reaction force acting on the tooth mold 8 all act in the plane direction of the outer peripheral plate portion 6, the oblique mold force does not act on the tooth mold 8 and the chip 7, resulting in damage. Therefore, the mowing operation can be performed smoothly.
According to the invention described in claim 4, since the plurality of through holes 10 are formed in the range of the inclined surface 5 of the blade plate 1, the overall weight of the blade plate 1 is reduced without greatly reducing the strength of the blade plate 1. can do. Further, the design taste can be refined by the through hole 10.

FIG. 1 is a longitudinal sectional view showing an embodiment of a tip cutter for a brush cutter according to the present invention, FIG. 2 is a plan view of the chip saw shown in FIG. FIG. 3 is a longitudinal sectional view showing a usage state of the brush cutter, FIG. 4 is a plan view of a chip saw showing another embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a brush cutter tip saw according to the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view showing an embodiment of a tip saw for a brush cutter according to the present invention, and FIG. 2 is a plan view of the tip saw shown in FIG.

In the present invention, a planar circular blade plate material is processed into a three-dimensional shape as shown in FIG. 1 by, for example, spatula drawing or pressing.
The tip saw shown in FIG. 1 forms a short cylindrical portion 3 having a flat upper surface 3 a at the center of the blade plate 1. A mounting hole 2 is formed in the upper surface 3a of the short cylindrical portion 3, and a circular protrusion 4 having a relatively large rounded surface is formed at the lower end. An inclined surface 5 is formed continuously outward from the circular protrusion 4 and directed upward. In the illustrated embodiment, the inclined surface 5 is formed linearly, but may be a curved surface.

The upper end of the inclined surface 5 is bent in the horizontal direction to form the outer peripheral flat plate portion 6. A plurality of tooth molds 8, 8, that is, galettes 9 are formed between the tooth molds on the outer peripheral flat plate portion 6, and a chip saw is completed by brazing the chip 7 on the front surface in the rotation direction of the tooth mold 8. I am letting.
As shown in FIG. 3, the height of the short cylindrical portion 3 is set to a height at which the attachment member and the attachment bolt 12 attached to the rotary drive portion of the brush cutter do not protrude downward.

  The tip saw having the above configuration has a three-dimensional shape and the outer peripheral flat plate portion 6 is in the horizontal direction. Therefore, the directions of the tooth mold 8 and the tip 7 are perpendicular to the rotational axis direction of the blade plate 1, and the blade plate 1. Can be used as the cutting force of the workpiece A without waste. This means that the blade plate 1, that is, the tip saw, can be smoothly cut by moving the blade plate 1, that is, the tip saw, with respect to an object A to be cut such as a shrub. It is not necessary to incline the blade plate at an angle when it is inclined with respect to the rotation axis direction, for example, when performing a brushing operation.

  The length of the inclined surface 5 following the rounded protrusion 4 is not particularly limited, but the outer peripheral flat plate portion 6 formed at the upper end of the inclined surface 5 and the upper surface 3a of the short cylindrical portion 3 are flush with each other. It is preferable to set the length of the inclined surface 5 so as to be positioned above. In this way, as shown in FIG. 3, the height position that is mounted and driven by the rotary drive unit of the brush cutter and the height of the tooth mold 8, that is, the tip 7 on which the force is applied by the brush cutting operation, are determined. The driving force is consistent and used for the mowing work without waste. In other words, an extra force that peels off the chip does not act.

  The width of the outer peripheral flat plate portion 6 formed at the upper end of the inclined surface 5 is assumed to have a width equal to or larger than the width at which the entire tooth mold 8 including the galette 9 for taking in the workpiece is formed on the plane. Thereby, although the blade plate 1 is bent, it is possible to avoid a deformation in which a part of the tooth mold 8 is included in the inclined surface. And the resistance of cutting applied to the chip is supported by the whole blade plate without difficulty.

In the tip saw according to the present invention, the short cylindrical portion 3, the protruding portion 4, the inclined surface 5, and the outer peripheral flat plate portion 6 are continuously formed. Therefore, the strength is extremely excellent. Accordingly, it is possible to reduce the thickness by reducing the thickness of the plate 1. However, in order to further reduce the weight while maintaining the strength as the blade plate, it is conceivable to make the through hole 10.
At that time, as shown in FIG. 4, a durable and light-weight tip saw can be realized by forming the through holes 10 and 10 only in the inclined surface 5 that occupies a large area and relatively disperses stress. it can. Further, the design taste can be refined by the through hole 10.

Conventionally, drilling a through hole in a flat chip saw has been implemented as a general-purpose technology. However, depending on where the hole is drilled, there is a possibility that the strength may be lowered. Do not be constant. In the tip saw of the present invention, a tip saw excellent in strength can be realized by forming the through hole 10 only on the inclined surface 5 which is the outside of the protruding portion 4.
As for the shape of the through-holes 10 and 10 drilled in the inclined surface 5, through-holes of any shape other than a circle or a circle can be drilled from both surfaces of a design effect and a light weight effect.

DESCRIPTION OF SYMBOLS 1 ... Blade plate, 2 ... Mounting hole, 3 ... Short cylindrical part, 3a ... Upper surface, 4 ... Projection part, 5 ... Inclined surface, 6 ... Outer flat plate part, 7 ... Tip, 8 ... Tooth type, 9 ... Galette, 10 ... through hole, 11 ... brusher, 12 ... mounting bolt, A ... cut object.

Claims (4)

  A short cylindrical portion having a flat upper surface is formed at the center of the blade plate, a mounting hole is formed in the upper surface of the short cylindrical portion, a circular protrusion is formed at a lower end with a relatively large rounded surface, and the circular An inclined surface that is continuous with the protruding portion and formed outward and upward is formed, an upper end of the inclined surface is bent in a horizontal direction to form an outer peripheral flat plate portion, and a chip is joined to the outer peripheral edge of the outer peripheral flat plate portion. A chip saw for a brush cutter, characterized in that it has a tooth shape.   2. The chip saw for a brush cutter according to claim 1, wherein the upper surface of the short cylindrical portion formed in the central portion and the upper surface of the outer peripheral flat plate portion are positioned on the same plane.   3. The cutting according to claim 1, wherein the width of the outer peripheral flat plate portion has a width equal to or larger than a width in which a whole tooth mold including a gallet for taking an object to be cut is formed on a plane. Chip saw for payment machine.   The tip saw for a brush cutter according to any one of claims 1 to 3, wherein a plurality of through holes are formed in a range of an inclined surface of the blade plate.

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