JP3002953U - Mowing blade for preventing weeding of a mower - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To prevent grass and vines cut by the cutting blade from winding around the cutting blade itself and its rotary bearing. [Structure] A plurality of weeding board pieces B from the upper surface of the cutting blade body 18
In an array distribution state of overall rotational symmetry and cut and raised obliquely outward at a constant angle, and the front edge portion of each cut and raised weeding plate piece B in the rotation advancing direction F has a sharp ridge edge. 22 and each cutting edge 22
Given a certain clearance angle γ to the above-mentioned weeding plate piece B during rotation.
It was decided that the blade edge 22 of the above should be used to grind grass, vines, etc., and at the same time, to throw them outward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a mowing blade for preventing grass cutting of a brush cutter.

[0002]

[Prior art]

 An engine is installed at one end of a main rod made of light metal pipe or FRP, and a cutting blade is pivotally supported at the other end as well, and the cutting blade is rotated at high speed by the driving force from the engine. A brush cutter that is shaken by an operator to perform mowing work on a farm road or a ridge is known, and various products thereof are commercially available.

The above-mentioned injury accident in mowing work is likely to be caused by flying stones, and also when removing grass or vines wound around the cutting blade, its holding boss, and the transmission box that is the rotary bearing part. . This is because the removal work is often performed without stopping the engine.

Japanese Utility Model Laid-Open No. 62-331231 has been proposed as a technique in which the cutting blade itself is subjected to a special process in order to prevent such winding of grass and vines.

[0005]

[Problems to be solved by the device]

 However, in the case of the above-mentioned known device, a substantially triangular cutting blade (4) is welded and integrated on the upper surface of the rotary blade (cutting blade) (1) in a vertical standing state, and the cutting blade (upper edge) ( Since 3) has a configuration that extends parallel to the circumferential direction of the rotary blade (1), even if the rotary blade (1) is rotated, the cutting blade (4) has a substantially triangular shape. However, it is not possible to efficiently and surely cut grass and vines.

Furthermore, since the cutting blade (4) stands upright at a right angle to the rotary blade (1), even if the upper edge of the cutting blade (4) is made into a ridge line as a sharp cutting blade (3), the cutting grass is cut by this. It was not possible to positively throw the vines and vines outward from the rotary blade (1), and these still remained in the rotary blade (1) and its rotary shaft (7) while the mowing work was continued. The gripping bosses (8) and (9) and the gear box (6) are wound around and remain.

On the other hand, there are commercially available products in which the above cutting blade for preventing winding is cut and raised diagonally inward from the upper surface of the cutting blade. However, this still effectively utilizes the rotational centrifugal force of the cutting blade. However, it is impossible to throw grass, vines, etc. after cutting with the cutting blade to the outside of the cutting blade, rather, the cutting blade is entangled and accumulated, and its original performance can be exhibited early. Disappear.

[0008]

[Means for Solving the Problems]

 The present invention intends to improve such a problem. As a construction of a cutting blade useful for that purpose, firstly, a plurality of weeding plate pieces are arranged from the upper surface of the cutting blade main body so as to have an overall distribution of rotational symmetry. As a state, cut and raise diagonally outward at a certain angle, and process the leading edge of each cut and raised weeding plate in the direction of rotation as a blade edge with a sharp ridge, and make a constant relief at each blade edge. It is characterized by giving an angle and slicing to the outside at the same time as cutting grass and vines by the cutting edge of the above weeding plate piece during rotation,

Secondly, a plurality of weeding board pieces that are bent into a generally V-shaped overall shape from an attachment piece portion to the cutting blade body and an inclined piece portion that intersects the plane of the cutting blade body at a certain angle. The attached piece of each weeding plate piece is fixed to the upper surface of the cutting blade main body with the remaining inclined piece part standing upright outward and fixed in an array distribution type with overall rotational symmetry. In addition, the front edge of each inclined piece in the direction of rotation is processed as a cutting edge with a sharp ridge line, and a constant clearance angle is given to each cutting edge so that the cutting edge of the weeding board piece is in use during rotation. According to the law, it is specified that the grass and vines should be ground and released at the same time.

[0010]

[Action]

 According to the first feature of the present invention, the weeding plate piece is cut and raised obliquely outward from the upper surface of the cutting blade main body, and in relation to the rotational advancing direction of the cutting blade main body, Since the front edge of the weeding plate piece is processed as a cutting edge with a sharp ridge line, and since the cutting edge has a certain clearance angle, it was cut off by the cutting edge of the cutting blade body during rotation. Grass and vines will be surely ground by the cutting edge of the above-mentioned weeding plate pieces, and will be actively thrown outward while making effective use of the centrifugal force of rotation.

As a result, of course, there is no possibility that the cutting blade itself will be wound around the rotary support shaft, the boss, the transmission box, and the like, and no removal work is required. In addition, since the above-mentioned weeding plate pieces are distributed in an array state in which the weeding plate pieces have a general rotational symmetry, the cutting blade itself can perform a normal rotating action, and there is no fear of resistance. .

Further, according to the configuration of the present invention having the above-mentioned second feature, even if the weeding plate piece is a separate object from the cutting blade, the inclined piece portion of the weeding plate piece is the cut and raised weeding plate piece. In order to achieve the same function, the above-mentioned actions and effects can be achieved, and instead, weeding plate pieces are retrofitted and integrated with various commercially available cutting blades to prevent grass and vines from wrapping around the cutting blades. Can be given, which has the advantage of being versatile.

[0013]

【Example】

 Hereinafter, referring to the drawings, the specific configuration of the present invention will be described in detail. FIG. 1 shows a use state of the cutting blade (A) according to the first embodiment, and (11) is a main shaft of the brush cutter. Therefore, it penetrates the inside of the main rod (12) and is rotationally driven by an engine (not shown).

Reference numeral (13) is a cutting blade rotary support shaft which is transmission-coupled to the tip end of the main shaft (11) through a bevel gear mechanism (14) and stands upright in a state intersecting with the main shaft (11). There is. Reference numeral (15) is a transmission box (bevel gear box), and both the main shaft (11) and the rotary support shaft (13) are rotatable by a plurality of bearings (16) and (17) enclosed therein. Support.

The lower end portion of the rotary support shaft (13) is exposed from the transmission box (15), and the cutting blade (A) is detachably and replaceably attached to the exposed lower end portion and is integrally rotatable. Used by fitting. The cutting blade (A) has not only the original function of cutting grass to be planted on farm roads and ridges, but also the cut grass and vines are the rotary shaft (13) and transmission box (15). It has a structure that also has a function to prevent wrapping around.

That is, in FIGS. 2 to 6 in which the cutting blade (A) is extracted and shown, (18) is a cutting blade body composed of a circular saw made of a special steel plate, and a plurality of cutting edges (19) are provided on the circumferential surface thereof. ) Has been engraved. The sharp ridge of each cutting edge (19) extends along the radius line of the cutting blade body (18) and does not have its clearance or opening angle. A chip saw instead of a circular saw may be used as the cutting blade body (18).

(20) is a mounting hole formed at the center of rotation of the cutting blade main body (18), and (B) is located around the mounting hole (20), but the transmission box (15) The cutting blade body (18) is a plurality of weeding plate pieces that are obliquely outwardly raised by a certain angle (α) from the upper surface of the cutting blade body (18) as an array distribution state that does not interfere with each other. The constant angle (α) intersecting the plane of 18) is preferably set to about 40 to 50 degrees. Reference numeral (21) is a punched hole that opens in the cutting blade body (18) in opposition to the cut and raised portion of the weeding plate piece (B).

In that case, each weeding plate piece (B) is shaped in a quadrangle reminiscent of a horizontal saw tooth when viewed from above the cutting blade body (18), and in front of its rotational advancing direction (F). One side forming the edge is ridged as a sharp cutting edge (22). As for the sharpness of the cutting edge (22), it is desirable to carry out polishing to an acute angle (β) of about 45 degrees.

Moreover, the ridge line of each cutting edge (22) is cut and raised from the cutting blade main body (18), and the bending base point (X) of the above weeding plate piece (B) and the rotation of the cutting blade main body (18). A virtual radial line (R-R) connecting the center (O) is extended as a relation intersecting an acute angle (γ), and the acute angle (γ) is the clearance angle or opening angle of the cutting edge (22). To function as.

According to such a configuration, when the cutting blade body (18) is rotationally driven in the direction of the arrow (F) in FIG. 3 during the mowing work, the blade edge (22) of the weeding plate piece (B) thereof is used. At the same time, the grass and vines will be surely cut off, and at the same time, the cut grass and vines will not get entangled in the cutting edge (22) and will not clog the punched hole (21). Together with the power, they will be actively thrown out.

As a result, there is no risk that the above-mentioned grass and vines will be attached to the cutting blade (A) itself, the rotation spindle (13) and the transmission box (15), and the cutting operation is interrupted. Then, there is no need or risk of removing them. However, of course, the weeding plate piece (B) may be shaped into a triangular shape in plan view or a square shape other than the side saw tooth, as long as it can exert such a function.

In any case, the cutting blade (A) is integrally rotated to the rotation support shaft (13) through a pair of upper and lower split mold bosses (23) (24) fitted and clamped at the center of rotation thereof. Be fitted as you can. (25) is a spline or key interposed on the fitting surface, (26) is a bearing metal or bush, (27) is a sealing material, and (28) is a fixing screwed into the rotary support shaft (13) from below. These are bolts and fix the bosses (23) (24) of the cutting blade (A) in a state where they do not come off.

However, both the fixing bolt (28) and the bosses (23) and (24) are extracted from the rotary support shaft (13) and the upper and lower pairs of the bosses (23) and (24) are disassembled. The cutting blade (A) can also be attached / detached / replaced by. Needless to say, the fixing bolt (28) is engraved in the opposite spiral direction to the cutting blade (A).

(29) is sandwiched between the lower boss (24) and the head portion of the fixing bolt (28) having a large diameter, and is rotated integrally with the cutting blade (A). It is a stable ground plate, and the center of rotation of the ground plate is depressed from the ground surface to sink the head of the fixing bolt (28) and keep the cutting blade (A) in a floating state where it does not ground. .

Further, (30) is a substantially bowl-shaped cover skirt that approaches the upper surface of the cutting blade (A), and is fixed to the overhanging flange (31) of the transmission box (15) from below by a screw (32) or the like. It is integrated. When such a cover skirt (30) is attached and used, the weeding plate piece (B) is cut and raised from the cutting blade main body (18) so as to face the outer peripheral surface of the cover skirt (30). It will be. If the cutting blade (A) of the above weeding plate piece (B) is used in combination with such a cover scar (30) to bring it to the outer peripheral surface as close as possible, the above grass, vine, or wound The preventive effect can be further enhanced, which is extremely beneficial.

Next, FIGS. 7 and 8 show a second embodiment of the present invention corresponding to FIGS. 3 and 4, in which a plurality of weeding plate pieces (B) are provided separately from the cutting blade body (18). The cutting blade main body (18) is fixed to and integrated with the upper surface of the cutting blade body (18).

That is, each weeding plate piece (B) of the cutting blade (A) is a piece (33) of attachment from one hardened steel plate to the cutting blade body (18) and the cutting blade body (18). It is bent into an almost V-shape as a whole with a flat surface and an inclined piece portion (34) intersecting at a constant angle (α).

Then, the remaining attaching piece portion (33) has a cutting blade so that the inclined piece portion (34) is in a relation of standing up outward like the weeding plate piece (B) of the first embodiment. It is fixedly integrated with the upper surface of the main body (18) by spot welding, brazing, or other means.

In this case, the front edge portion of the inclined piece portion (34) in the rotational direction (F) is polished as a blade edge (35) having a sharp ridge, and the blade edge (35) is not A constant clearance angle (γ) is also given. With the cutting edge (35) of the inclined piece portion (34) facing forward so that the clearance angle (γ) can be secured, the attachment piece portion (33) of the weeding plate piece (B) is attached to the upper surface of the cutting blade body (18). It is installed in.

By adopting such a configuration of the second embodiment as well, it is possible to achieve the same action and effect as the first embodiment, and especially for various cutting blades (A) on the market, weeding plate pieces ( By integrating B) afterwards, it can be said that the cutting blade (A) has a versatile advantage in that it has a function of preventing curling of grass and vines.

Since the other configurations in the second embodiment are substantially the same as those in the first embodiment, only the corresponding reference numerals to those in FIGS. The description is omitted.

Although the transmission mechanism from the engine to the mowing blade (A) is embodied as the bevel gear mechanism (14) in the illustrated embodiment, a mowing machine using a flexible shaft instead of the bevel gear mechanism (14) may be used. Of course, the present invention can be applied.

[0033]

[Effect of device]

 As described above, in the present invention, a plurality of weeding plate pieces (B) from the upper surface of the cutting blade body (18) are collectively referred to as a rotating blade as a cutting blade (A) for preventing grass curling of a brush cutter. With the arrangement distribution state as shown below and cutting and raising diagonally outward by a certain angle (α), the leading edge portion in the rotation advancing direction (F) of each of the cut and raised weeding plate pieces (B) is formed into a sharp ridge line. The blade edge (22) of the above-mentioned weeding plate piece (B) is processed by the blade edge (22) of the above-mentioned weeding plate piece (B) during rotation to give a constant clearance angle (γ) to each blade edge (22). Since it is stipulated that it should be thrown out at the same time as it is cut off, there is an effect that the problems of the prior art mentioned at the beginning can be certainly improved.

That is, according to the above configuration of the present invention, each of the weeding plate pieces (B) distributed in an array state having a general rotational symmetry has a certain angle (from the upper surface of the cutting blade body (18)). α) It is cut and raised diagonally outward, and the blade edge (22) sharply ridged at the leading edge in the direction of rotation (F) is given a certain clearance angle (γ). Therefore, the grass and the vines cut by the cutting blade main body (18) during use by rotationally driving this along the rotation advancing direction (F) have a sharp cutting edge (B) of the weeding plate piece (B). 22), it is ground without loss, and due to the synergistic effect of the clearance angle (γ) of the cutting edge (22) and the rotational centrifugal force, the result is that the cutting edge (A) is actively thrown outward. Not to mention the rotation shaft (13), the bosses (23) and (24), and the transmission box itself. There is no risk of wrapping around the box (15).

Therefore, there is no annoyance and risk of interrupting the mowing work and removing grass and vines wound around the rotary support shaft (13) and the bearing portion thereof, and the mowing work can be carried out lightly and efficiently all the time. It can be done.

Even if the above-mentioned structure is adopted, such an effect can be similarly achieved without any trouble. Even if the weeding plate piece (B) is prepared and prepared separately from the cutting blade main body (18), it is fixedly integrated to the upper surface of the cutting blade main body (18) via the attachment piece (33). The sloped piece portion (34) of the weeding plate piece (B) thus cut off is the same as the weeding plate piece (B) cut and raised as described above and is outside the cutting blade body (18) at a constant angle (α). In a state of standing upright, and with a sharp edge (35) machined on the front edge in the direction of rotation (F), a certain clearance angle (γ) is given, which is substantially the same. This is because the action of

In that case, according to the weeding plate piece (B) which is a separate body from the cutting blade main body (18), this is integrated with various commercially available cutting blades (A) afterwards, and the cutting blade (B) is integrated. A) can be provided with the above-mentioned function of preventing curling of grass and vines, and in that sense, it has the effect of increasing versatility.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a use state of a cutting blade according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing the cutting blade in an extracted manner.

FIG. 3 is a plan view of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

6 is an enlarged sectional view taken along line 6-6 of FIG.

FIG. 7 is a plan view showing a second embodiment of the cutting blade corresponding to FIG.

8 is a sectional view taken along line 8-8 of FIG.

[Explanation of symbols]

 (18) -Mowing blade body (22) -Blade edge (33) -Mounting piece (34) -Inclined piece (35) -Blade edge (A) -Mowing blade (B) -Weeding board piece (F) -Rotation progress Direction (α), constant angle (γ), clearance angle

Claims (2)

[Scope of utility model registration request] 1. A plurality of weeding plate pieces (B) are cut and raised from the upper surface of a cutting blade main body (18) obliquely outward at a constant angle (α) in an array distribution state of overall rotational symmetry, The front edge of the cut and raised weeding plate pieces (B) in the direction of rotation (F) is processed as a cutting edge (22) having a sharp ridge, and a constant clearance angle (γ) is applied to each cutting edge (22). ) Is given and the blade tip (22) of the above-mentioned weeding plate piece (B) is used to rotate the grass and vines, and at the same time, it is slaughtered outward. A mowing blade for preventing weeding. 2. A piece (33) attached to a cutting blade body (18).
And a plurality of weeding plate pieces (B) that are bent in a substantially V-shape overall from the plane of the cutting blade body (18) and the inclined piece portion (34) that intersects at a constant angle (α), The mounting piece portion (33) of each weeding plate piece (B) is placed on the upper surface of the cutting blade main body (18) in a relational state in which the remaining inclined piece portion (34) stands outward, and with the overall rotational symmetry. In addition to being fixedly integrated into an array distribution type, the front edge portion in the rotation advancing direction (F) of each of the inclined piece portions (34) is processed as a blade edge (35) having a sharp ridge line, and each blade edge (35) is processed. ) Is given a certain clearance angle (γ), and the blade edge (35) of the above-mentioned weeding plate piece (B) is used during rotation to grind grass and vines and to release them outward A cutting blade for preventing weeding of a brush cutter.