JP2013183661A - Winding-preventing member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winding-preventing member which is attached to an upper surface of a weed-cutting blade rotatably disposed at the tip portion of a rotation shaft of a weeding machine to efficiently cut off weeds, vines and the like to be wound on the rotation shaft.SOLUTION: A winding-preventing member is formed of a plate, and comprises a disk-like base to be fixed to the upper surface of the cutting blade, and a first winding-preventing blades and a second winding-preventing blades alternately extended from the outer peripheral edge of the base. The first winding-preventing blades are projected from the outer peripheral edge of the base in the obliquely outer upper direction at a tilted angle, and cutting blades are disposed in the rotation direction front edge portions. The second winding-preventing blades are projected from the outer peripheral edge of the base in the obliquely outer upper direction at a tilted angle, and are gradually heightened from the rotation direction front edge portions to the rear edge portions, and cutting blades are disposed in the outer peripheral edge portions that binds the front edge portions to the rear edge portions.

Description

  The present invention relates to a wrapping prevention member that is attached to the upper surface of a brush cutter blade that is rotatably provided at the tip of a rotary shaft of a brush cutter and rotates integrally with the brush cutter blade.

  In general, a hand-held brush cutter is provided with a gear case at the front end of a main shaft and an engine as a power source at the rear end of the main shaft. The gear case accommodates a rotary shaft that transmits the output of the engine in a state of protruding downward, and a cutting blade that rotates integrally with the rotary shaft is provided at the tip of the rotary shaft. As a result, when the rotary shaft is driven by the engine, the cutting blade rotates, and grass, vines, and the like can be cut.

  Usually, in order to avoid contact between the brush blade and the gear case, a gap is formed between the brush blade and the gear case, and the rotating shaft is exposed in the gap portion. For this reason, grass cut by the cutting blade or uncut grass may be placed on the upper surface of the cutting blade and enter the gap. As a result, uncut grass is wound around the rotating shaft, and when the winding is intense, the cutting blade may stop, and the work of removing the wound grass is very complicated.

  In order to prevent the winding of the grass, a circular saw, an upper circular saw clamping member, and a lower circular saw clamping member are clamped from below on the rotating shaft, and the winding is between the circular saw and the upper circular saw clamping member. The anti-winding member is sandwiched, and the anti-winding member is formed with an anti-winding blade and a standing blade projecting outward from the substrate portion of the anti-winding member. An anti-winding member is disclosed which is formed by bending a base end portion of a trapezoidal shape of a trapezoidal shape in plan view formed on the outer peripheral edge of the upper portion and obliquely upward and bending an intermediate portion of the protruding portion obliquely downward. (See Patent Document 1).

  Further, in the auxiliary blade for a mower attached to the upper surface of the mowing blade provided at the tip of the main shaft and rotating integrally with the mowing blade, the auxiliary blade includes a base plate disposed on the upper surface of the mowing blade, It consists of a plurality of blade plate pieces that protrude obliquely upward and outward from the base plate and have cutting edges at the front edge in the rotational direction, and the blade plate pieces are for combinations of different inclination angles. An auxiliary blade is disclosed (see Patent Document 2).

  Further, an anti-winding body is disclosed in which an arbitrary number of cutting blades are formed on the upper part of the week wall of the petri dish-shaped main body, and an arbitrary number of wind-raising blades are arranged in the lateral direction from the week wall (patent) Reference 3).

Japanese Patent No. 3950443 Utility Model Registration No. 3140635 Japanese Utility Model Publication No. 62-128720

When the substrate portion is fixed to the fixed surface of the cutting blade or the fixed surface of the rotating member, the anti-winding member described in Prior Literature 1 has a predetermined gap between the tip of the anti-winding blade and the fixed surface of the cutting blade. The winding preventing blade is formed by plastically deforming upward at the base end portion thereof and plastically deforming downward at the intermediate portion so that a gap is formed. For this reason, cut grass, vines, and the like are caught in the triangular cavity surrounded by the fixed surface of the cutting blade or the fixed surface of the rotating member and the inner plate and outer plate of the anti-winding blade. There is a problem that the prevention function is lowered.

  The auxiliary blade for a mower described in Prior Literature 2 includes a base plate disposed on the upper surface of the mowing blade, and a plurality of blades that protrude obliquely upward from the base plate with an inclination angle and have a cutting blade at the front edge in the rotational direction. It consists of blade plate pieces, and the plurality of blade plate pieces are made of combinations with different inclination angles. However, since grass and vines riding on the upper surface of the auxiliary blade for the mower stick to the upper boss, there is a problem that a saddle type cover skirt surrounding the upper boss must be provided in order to prevent this. is there.

  The anti-winding body described in Prior Literature 3 has propeller-like wind-raising blades on the outer periphery of the week wall of the petri dish-shaped body in order to guide grass and vines to the cutting blade provided on the upper part of the week wall of the petri dish-shaped body It is arranged. However, since the structure only changes the wind direction upward, there is a problem that the cutting blade standing on the upper part of the week wall cannot be expected to induce grass and vines.

  The present invention has been made to solve the above-described problems, and is attached to the upper surface of a brush cutter blade rotatably provided at the tip of a rotary shaft of a brush cutter, and is intended to be wound around the rotary shaft. An object of the present invention is to provide a wrapping prevention member that effectively cuts and removes vines and the like.

  The invention according to claim 1 is a wrapping prevention member that is attached to the upper surface of a brush cutter blade rotatably provided at the tip of the rotary shaft of the brush cutter and rotates integrally with the brush cutter blade, The anti-winding member is obtained by punching and bending a thin steel plate with a press or the like. The winding prevention member includes a disk-shaped substrate portion fixed to the upper surface of the brush cutting blade, a first winding prevention blade and a second winding prevention blade which are alternately extended on the outer peripheral edge of the substrate portion. It is configured. The first winding prevention blade protrudes obliquely outward and upward from the outer peripheral edge of the substrate portion, and a cutting edge is provided at the front edge portion in the rotation direction. On the other hand, the second anti-winding blade is formed so as to protrude obliquely upward and outward from the outer periphery of the substrate portion and to be gradually increased from the front edge portion to the rear edge portion in the rotation direction. A cutting edge is provided at the outer peripheral edge connecting the edge and the rear edge.

  With such a configuration, the wrapping preventing member rotates integrally with the brush cutting blade, and therefore the wrapping prevention member is provided with the first wrapping prevention blade and the second wrapping prevention blade provided on the wrapping prevention member. Grass and vines that come into contact with the prevention member are cut. Thereby, grass and a vine can be prevented from being entangled with the rotating shaft and the wrapping preventing member. The second anti-winding blade is formed so as to protrude obliquely outward and upward from the outer peripheral edge of the substrate portion, and to gradually increase from the front edge portion to the rear edge portion in the rotation direction. This makes it difficult for the grass and vines to wind around the rotating shaft by changing the wind direction upward. Furthermore, since the wrapping preventing member is integrally formed from a single thin steel plate, the manufacturing cost can be reduced.

  The invention according to claim 2 is characterized in that the second anti-winding blade protrudes outward from the outer peripheral edge of the substrate portion concentrically, and the circular peripheral portion is erected vertically upward with respect to the substrate portion. The upper end surface is provided with a cutting blade. This prevents the grass and vines from wrapping around the rotating shaft while the erected circular peripheral portion serves as a wall, and prevents the grass and vines from entering the rotating shaft beyond the circular peripheral portion. Since it cuts with the cutting blade provided in the upper end surface, it can prevent that a grass and a vine get entangled with a rotating shaft or a winding prevention member.

  In the invention according to claim 3, the second anti-winding blade protrudes from the outer peripheral edge of the substrate part to the outer side so that the protrusion width gradually decreases from the front edge part to the rear edge part in the rotation direction, And it forms so that it may become high gradually from the front edge part of a rotation direction to a rear edge part, and the cutting edge is provided in the outer-periphery edge part which connects the said front edge part and a rear edge part. This prevents grass and vines from wrapping around the rotating shaft by changing the wind direction and wind speed. In addition, the erected circular peripheral edge serves as a wall to prevent the grass and vines from winding around the rotating shaft, and the grass and vines that enter the rotating shaft side beyond the circular peripheral edge, Since it cuts with the cutting blade provided in the upper end surface, it can prevent that a grass and a vine get entangled with a rotating shaft or a winding prevention member.

  The invention according to claim 4 is characterized in that the second anti-winding blade protrudes from the outer peripheral edge of the substrate part to the outer side so as to gradually protrude from the front edge part to the rear edge part in the rotational direction, and the width increases. And it forms so that it may become high gradually from the front edge part of a rotation direction to a rear edge part, and the cutting edge is provided in the outer-periphery edge part which connects the said front edge part and a rear edge part. This prevents grass and vines from wrapping around the rotating shaft by changing the wind direction and wind speed.

  According to a fifth aspect of the present invention, a plurality of the first winding prevention blades and a plurality of second winding prevention blades are provided, an inclination angle between the first winding prevention blades, and the second winding prevention blade. At least one of the inclination angles of the blades or the inclination angles of the first winding prevention blade and the second winding prevention blade is different. With this configuration, each anti-winding blade can cut grass and vines with different rotation trajectories, and the subsequent anti-winding blades cut grass and vines left uncut by the preceding anti-winding blade. Will cut grass and vines short. Thereby, in addition to the effect | action of invention of Claims 1-3, grass and a vine can be cut | disconnected from various angles. Therefore, since grass and vines can be cut more efficiently, it is possible to further suppress the grass and vines from being entangled with the rotating shaft.

  The invention according to claim 6 is formed such that the first winding prevention blade has a trapezoidal shape that becomes narrower toward the tip. Thereby, the strength in the rotation direction of the tip of the first winding preventing blade is ensured, so that the product life is improved.

  Since the winding preventing member of the present invention rotates integrally with the brush cutting blade, the first winding preventing blade and the second winding preventing blade provided on the winding preventing member come into contact with the winding preventing member. Grass and vines are cut. Thereby, grass and a vine can be prevented from being entangled with the rotating shaft and the wrapping preventing member. Further, the second winding preventing blade protrudes from the outer peripheral edge of the substrate portion obliquely outwardly with an inclination angle and is formed so as to gradually increase from the front edge portion to the rear edge portion in the rotational direction. By changing the, the grass and vines are difficult to wind around the rotating shaft. Furthermore, since the wrapping preventing member is integrally formed from a single thin steel plate, the manufacturing cost can be reduced.

  Further, the erected circular peripheral edge serves as a wall to prevent the grass and vines from being wound around the rotary shaft, and the grass and vines that enter the rotary shaft side beyond the circular peripheral edge, Since it cuts with the cutting blade provided in the upper end surface of the said circle peripheral part, it can prevent that a grass and a vine get entangled with a rotating shaft or a winding prevention member. Also, by changing the wind direction and wind speed, grass and vines are prevented from winding around the rotating shaft.

  Moreover, by cutting grass and vines from various angles, cutting can be performed more efficiently, and the grass and vines can be further prevented from being entangled with the rotating shaft. Further, since the first winding prevention blade is formed in a trapezoidal shape that becomes narrower toward the tip portion, the strength in the rotation direction of the tip portion of the first winding prevention blade is ensured. As a result, the product life is improved.

It is a top view which shows 1st Embodiment of this invention. It is a front view which shows 1st Embodiment of this invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is CC sectional drawing of FIG. It is DD sectional drawing of FIG. It is a top view which shows 2nd Embodiment of this invention. It is a top view which shows 3rd Embodiment of this invention. It is a top view which shows 4th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a plan view showing a first embodiment of the present invention, and FIG. 2 is a front view thereof. 1 and 2, the wrapping preventing member 1 is formed by punching and bending a thin steel plate into a predetermined shape. The winding prevention member 1 includes a base plate portion 2 provided with a mounting hole 3 for inserting a rotation shaft at a center portion thereof, a first winding prevention blade 4 and a second winding provided on the circumferential edge of the base end portion 2. A sticking prevention blade 5 is provided. The wrapping prevention member 1 may be formed of a synthetic resin material such as hard plastics instead of a thin steel plate.

  On the outer peripheral edge of the substrate portion 2, the first winding prevention blade 4 and the second winding prevention blade 5 are provided alternately. As shown in FIG. 1, four first anti-winding blades 4 are provided to face the mounting hole 3, and as shown in FIG. The cutting edge 6 protrudes with a predetermined width at an inclination angle of 15 degrees, and a cutting edge 6 is formed on the front edge 8 in the rotational direction by polishing as shown in FIG.

  As shown in FIG. 1, four second winding prevention blades 5 are provided between the first winding prevention blades 4 so as to face the mounting holes 3. As shown in FIG. 4, the second winding preventing blade 5 protrudes from the substrate portion 2 obliquely upward and with a predetermined angle with an inclination angle, and the inclination angle of the front edge portion in the rotational direction is 0 degree. The leading edge of the trailing edge is formed so as to gradually increase from the leading edge 8 to the trailing edge 9 so as to be 18 degrees, and the outer peripheral edge connecting the leading edge 8 and the trailing edge 9 is shown in FIG. As shown in FIG. 2, the cutting edge 7 is formed by polishing. The number of the first winding prevention blade 4 and the second winding prevention blade 5 is not limited to four, and can be changed as appropriate, and the inclination angle is also limited to 15 degrees or 18 degrees. Instead, it can be changed as appropriate. In addition, the protruding widths of the first winding prevention blade 4 and the second winding prevention blade 5 from the outer peripheral edge of the substrate portion 2 to the obliquely outer upper side can be appropriately changed.

(Second Embodiment)
FIG. 7 is a plan view showing a second embodiment of the present invention. The second embodiment differs from the first embodiment in the shape of the second winding prevention blade 5a. Therefore, since it is the same as 1st Embodiment except the 2nd winding prevention blade 5a, description is abbreviate | omitted.

  The second anti-winding blade 5a protrudes from the outer periphery of the substrate part 2 to a concentric outer shape with a predetermined width, and the circular peripheral part stands vertically upward with respect to the substrate part 2 at a predetermined height. A wall 10a is formed, and a cutting edge 7a is provided on the upper end surface by polishing. The height from the substrate portion 2 to the upper end surface may be the same as the height from the substrate portion 2 to the tip portion of the first winding prevention blade 4, either high or low.

(Third embodiment)
FIG. 8 is a plan view showing a third embodiment of the present invention. 3rd Embodiment differs in the shape of the 2nd winding prevention blade 5b with respect to 1st Embodiment. Therefore, since it is the same as 1st Embodiment except the 2nd winding prevention blade 5b, description is abbreviate | omitted.

  The second winding preventing blade 5b protrudes from the outer peripheral edge of the substrate portion 2 to the outer side so as to gradually protrude from the front edge portion 8 to the rear edge portion 9 in the rotation direction, and the rotation width decreases. The front edge portion of the rear edge portion is inclined at 0 degree and the leading edge of the rear edge portion is 18 degrees so as to gradually increase from the front edge portion 8 to the rear edge portion 9. A cutting edge 7b is formed on the outer peripheral edge connecting the edge portions 9 by polishing. The inclination angle is not limited to 18 degrees, and can be changed as appropriate.

(Fourth embodiment)
FIG. 9 is a plan view showing a fourth embodiment of the present invention. 4th Embodiment differs in the shape of the 2nd winding prevention blade 5c with respect to 1st Embodiment. Therefore, since it is the same as that of 1st Embodiment except the 2nd winding prevention blade 5c, description is abbreviate | omitted.

  The second winding preventing blade 5c protrudes from the outer peripheral edge of the substrate portion 2 to the outer side so as to gradually protrude from the front edge portion 8 to the rear edge portion 9 in the rotation direction, and in the rotation direction. The front edge portion of the rear edge portion is inclined at 0 degree and the leading edge of the rear edge portion is 18 degrees so as to gradually increase from the front edge portion 8 to the rear edge portion 9. A cutting edge 7c is formed on the outer peripheral edge connecting the edge 9 by polishing. The inclination angle is not limited to 18 degrees, and can be changed as appropriate.

(Fifth embodiment)
In the first embodiment to the fourth embodiment, the first winding prevention blade 4 and the second winding prevention blades 5, 5a, 5b, and 5c are provided, respectively. It can be changed as appropriate. Also, the inclination angle between the first winding prevention blades 4, the inclination angle between the second winding prevention blades 5, 5 a, 5 b, 5 c, or the first winding prevention blade 4 and the second winding prevention. The blades 5, 5 a, 5 b, and 5 c can be appropriately formed so that at least one of the inclination angles is different. In this way, when the anti-winding members 1, 1a, 1b, 1c are rotated, the first anti-winding blade 4 and the second anti-winding blades 5, 5a, 5b having a multi-stage bending angle, Since the grass and the vine can be cut from various angles by 5c, it is possible to further prevent the grass and the vine from being entangled with the rotating shaft and the wrapping preventing members 1, 1a, 1b, and 1c.

(Sixth embodiment)
As shown in FIGS. 1 and 7 to 9, the first anti-winding blade 4 is formed to have a trapezoidal shape that becomes narrower in plan view as it goes toward the tip. When grass or a vine comes into contact with the first winding prevention blade 4, the load is most applied to the tip thereof, but since the first winding prevention blade 4 has a trapezoidal shape, the tip of the first winding prevention blade The strength in the rotation direction of the part is ensured, and deformation and damage are difficult. In addition, you may change the shape of the said 1st winding prevention blade into a trapezoid shape, and may make it a triangular shape.

  The wrapping prevention member of the present invention can be widely applied to a brush cutter provided with a disk-shaped brush cutter that rotates integrally with a rotating shaft, but can also be arranged on the upper surface of a case of a nylon cord cutter. is there.

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c Winding prevention member 2 Board | substrate part 3 Mounting hole 4 First winding prevention blade 5, 5a, 5b, 5c Second winding prevention blade 6 Cutting blade 7, 7a, 7b, 7c Cutting blade 8 Front edge 9 Rear edge 10a Wall

Claims (6)

A wrapping preventing member that is attached to the upper surface of a brush cutter provided rotatably at the tip of the rotary shaft of the brush cutter and rotates integrally with the brush cutter,
The wrapping prevention member is formed from a single plate material,
A disk-shaped substrate portion fixed to the upper surface of the brush cutting blade, and a first winding prevention blade and a second winding prevention blade alternately extending on the outer peripheral edge of the substrate portion;
The first winding prevention blade protrudes at an oblique angle upward from the outer peripheral edge of the substrate part, and a cutting edge is provided at the front edge part in the rotational direction,
The second winding preventing blade protrudes from the outer peripheral edge of the substrate portion obliquely outwardly with an inclination angle, and is formed so as to gradually increase from the front edge portion to the rear edge portion in the rotation direction. A wrapping preventing member, characterized in that a cutting edge is provided on an outer peripheral edge connecting the rear edge and the rear edge.   The second winding preventing blade protrudes outward from the outer peripheral edge of the substrate part concentrically, and the circular peripheral edge is erected vertically upward with respect to the substrate part. The anti-winding member according to claim 1, wherein the anti-winding member is provided.   The second anti-winding blade protrudes from the outer peripheral edge of the substrate portion to the outer side so as to gradually protrude from the front edge portion in the rotational direction to the rear edge portion, and the width of the front edge portion in the rotational direction decreases. 2. The anti-winding member according to claim 1, wherein the anti-winding member is formed so as to gradually become higher from the rear edge to the outer peripheral edge connecting the front edge and the rear edge. .   The second winding preventing blade protrudes from the outer peripheral edge of the substrate portion to the outer side so as to gradually protrude from the front edge portion in the rotation direction to the rear edge portion, and the front edge portion in the rotation direction. 2. The anti-winding member according to claim 1, wherein the anti-winding member is formed so as to gradually become higher from the rear edge to the outer peripheral edge connecting the front edge and the rear edge. .   A plurality of the first winding prevention blades and the second winding prevention blades are provided, and an inclination angle between the first winding prevention blades, an inclination angle between the second winding prevention blades, or the 5. The wrapping preventing member according to claim 1, wherein at least one of the inclination angles of the first wrapping prevention blade and the second wrapping prevention blade is different.   6. The anti-winding member according to claim 1, wherein the first anti-winding blade is formed to have a trapezoidal shape that becomes narrower toward a tip portion thereof.

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