JPS61100119A - Reaping blade for reaper - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a cutting blade for a brush cutter in which a blade portion is disposed on the peripheral edge of a cutting blade plate.

(Prior Art) Conventional steel plate rows S, which are often used in brush cutters, have various shapes, for example, cutting blade plates (α) as shown in FIGS. 5(A) and 5(B). The 4-blade type has four blades (b) arranged around the periphery of the cutting blade, and the 4-blade type has 30 blades around the periphery of the cutting blade (αl) as shown in Figure 6 (3). (bl
30-blade type (commonly known as improved 30-blade type) has a mounting hole (C) in the center, and a circular hole (d) in order to reduce weight. It has a flat plate-like structure that is rotatably driven by a two-stroke engine or the like.

(Problems with the prior art) The cutting blade, which has a blade section disposed on the peripheral edge of the cutting blade plate, has the advantage of being easy to extend, but has low frictional resistance in the air. If the throttle opening is increased, overrun may occur, increasing the danger to the worker and shortening the engine life.Furthermore, since the resistance of the cutting blade is small, the combustion of the engine may become unstable and the mower may become unstable. This causes the vibration of the rod etc. to increase.

Additionally, if a relatively small brush cutter equipped with a two-stroke engine is equipped with an overspeed prevention mechanism to prevent danger and reduce fatigue, the weight and cost will increase.) There are problems such as disappearing.

(Object of the Invention, Means for Solving Problems) The present invention was developed in order to solve the above-mentioned problems, and provides a cutting blade plate in which a blade portion is disposed on the peripheral edge. It is characterized by a configuration in which an air resistance plate formed to protrude from the plate surface is provided on a part of the plate surface, and an air resistance plate formed to protrude from the plate surface is provided on a part of the plate surface of the cutting blade plate. In particular, this results in a significant increase in weight and cost.
Another object of the present invention is to provide a brush cutter cutting blade which can eliminate the overrun of the cutting blade, apply an appropriate load in the normal use range, stabilize the carrot operation, and solve the above-mentioned conventional problems.

(Embodiment of the Invention) Figure IA) l) shows an embodiment of the present invention, which has four bell blades ( 2), and the cutting blade plate (1) has a spray hole (3) in the center thereof for attachment to the drive shaft (not shown) of the brush cutter. At the same time, a U-shaped punching is formed in a part of the plate surface of the cutting blade plate (1), and the punched part is bent and protruded from the plate surface by bending lines in the radial direction, and is subjected to plastic bending. A plurality of processed air resistance plates (5) are formed, and the air resistance plates (5) are arranged at appropriate intervals on the cutting blade plate (1) as shown in the figure. .

(Function) When the first embodiment of the present invention has the above-mentioned table structure and the air resistance plate (5) is used, the cutting blade of the first embodiment is used as shown in FIG. It can be expressed as a characteristic curve, and in Figure 1, Q1 is the output of the carrot, Ql) is the load absorption curve due to air resistance of the conventional cutting blade, and az is the load absorption curve of the cutting blade of the M1 embodiment. Point) (13 is the matching point at which the conventional cutting blade trap has the highest rotation speed and overruns into the dangerous rotation range B) (Nα or more), whereas point H4 is the matching point at which the cutting blade trap of the first embodiment has the highest rotation speed. Indicates the matching point of maximum rotation speed according to
α or higher) will not go over two.

On the other hand, in the normal rotation range (b), the air resistance plate (5)
The amount of work lost due to the increase in air resistance caused by the provision of this is small.

(Effects of the Invention) As described above, in the present invention, an air resistance plate that is formed to protrude from the plate surface is provided on a part of the plate surface of the cutting blade plate in which the blade portion is disposed on the peripheral edge. As a result, there is no overrun of the cutting blade (rotation within the dangerous rotation range), and the engine is moderately braked to a constant rotation, ensuring work safety and extending engine life.

In addition, even in the normal rotation range, a moderate load is always applied from the cutting blade, so the combustion of the engine tends to be stabilized. The fatigue of the operator is significantly reduced, the weight is not increased, and the bending direction of the air resistance plate creates buoyancy on the cutting blade, which prevents the tip from scattering, reducing the actual weight of the work and reducing fatigue. Brush cutting performance has been greatly improved, with reduced costs and no particular increase in cost.

(Other Embodiments of the Invention) FIG. 3 shows a second embodiment of the present invention. (1
) by providing multiple radial cutting lines that reach the periphery of the
A plurality of air resistance plates a! which are formed by bending and protruding one side edge of the cutting line from the plate surface and performing plastic bending processing! A third embodiment of the present invention is shown in FIG. A plurality of air resistance plates (C) are formed and arranged by making the punched portions protrude from the plate surface (by bending lines) and subjected to plastic bending. , (c) can provide the same effects as the first embodiment, and the shape and number of air resistance plates can be changed as necessary.

In the above example, a four-blade type cutting blade has been described, but the present invention can be widely applied to various types such as a 30-blade type.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1(A) is a plan view showing a first embodiment of the present invention;
Figure (1) is a sectional view of the 1-1 portion in Figure 1 (A), Figure 2 is a characteristic curve diagram of the first embodiment, Figure 3 is a plan view showing the M2 embodiment of the present invention, and Figure 4 The figure is a plan view showing the third embodiment of the present invention, FIG. 5(A) (II is a plan view showing the conventional example,
FIG. 6 is a cross-sectional view of 7 parts (4) is a plan view showing another conventional example and a sectional view of the vt-vt part. 1: Cutting blade plate 2: Blade portion 3: Mounting hole 5.15. 25:
Air Resistance Board Sub-Agent Patent Attorney Okamoto Shigemon and 3 other people (A) Figure 1 Figure 2 Figure 2 Efdun Rotation Liao degree N Figure 3 Figure 5 (A) Nigei 212 b Figure 4 Figure 6 Figure 1 Hirom≧Yomi h

Claims (1)

[Claims] A mower blade for a brush cutter, characterized in that an air resistance plate is provided on a part of the plate surface of the mower blade plate in which the blade portion is disposed on the peripheral edge thereof, and is formed to protrude from the plate surface.