JP2005110531A - Grass-cutting blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grass-cutting blade which can prevent that the stems of vines, and the like, are twined around the rotary shaft of a grass cutter. <P>SOLUTION: This grass-cutting blade 10 having saw blades 12 formed on the outer periphery of the disk-like substrate 11 of the blade is characterized in that projections 14 in which blades 15 for preventing the twining are disposed at sites arranged in the rotation direction of the grass-cutting blade 10 are vertically disposed at positions apart from the radial outer periphery of the main surface 1a of the substrate 11 in a distance of one-third of the radius. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a grass cutting blade used in a brush cutter for cutting weeds and the like, and more particularly, to a grass cutting blade for preventing vine grass and the like from being caught in a brush cutter.

  Traditionally, in machines used for mowing, a band for supporting the main body is hung on the shoulder, and a disk-shaped mowing blade attached to the tip of the handle and rotating at high speed is applied to the target grass. There was a brush cutter for mowing. Such a brush cutter can perform mowing work regardless of the shape of the land such as undulating land or narrow places.

  However, such a brush cutter is used when the grass of stems such as vines is wound around the rotating shaft or becomes entangled to reduce the mowing function by applying a load to the engine or to stop the rotation of the mowing blade. was there. In such a situation, it is necessary to remove the vine that has been wound, but it is very dangerous to carry out the operation without stopping the engine. Moreover, once the engine is stopped, the work is very complicated. Therefore, a mowing blade has been proposed that has a structure that prevents the grass of stems such as vine grass from being wound around (see Patent Document 1).

Registered Utility Model No. 30512240

  By the way, in the brush cutter as described above, a person has to hold the main body and make the grass cutting blade be high enough to cut the grass. At that time, if the weight of the main body including the grass cutting blade is heavy, a burden is placed on the person. In addition, since a plurality of blades are provided on the outer periphery of the grass cutting blade, it is very dangerous when no work is performed or when the grass cutting blade is replaced.

  The present invention has been proposed in view of such a conventional situation, and the grass cutting blade is reduced in weight, and the grass cutting work is smoothly advanced by preventing the stalks such as vine grass from being wrapped around the grass. An object of the present invention is to provide a mowing blade that can be used.

  Another object of the present invention is to provide a safe mowing blade case that does not cause unexpected injury when a mowing operation is not performed or when a mowing blade is replaced.

  In order to achieve the above-described object, a grass cutting blade according to the present invention is a rotary grass cutting blade provided with an outer peripheral blade formed on the outer periphery of a disk-shaped rotating body, and the outer periphery in the radial direction on the surface of the rotating body. A plurality of projecting portions provided with a wrapping preventing blade portion for preventing wrapping are provided upright at a position in the vicinity of 1/3 of the cutting blade facing the rotation direction of the mowing blade.

  In order to achieve the other objects described above, a grass cutting blade case covering the grass cutting blade according to the present invention includes a rotating grass cutting blade provided with an outer peripheral blade formed on the outer periphery of a disk-shaped rotating body. A plurality of protrusions provided with a wrapping preventing blade portion for preventing wrapping at a portion facing the rotation direction of the grass cutting blade was provided at a position near 1/3 from the outer periphery in the radial direction on the surface. A mowing blade case covering at least the outer peripheral blade and the anti-winding blade portion of the mowing blade, wherein the mowing blade case includes two left cases having a substantially U-shaped cross section covering the outer peripheral blade. There are provided a right case, a hinge portion in which a shaft connecting one end of each of the left case and the right case is perpendicular to the surface of the rotating body, and the hinge portion of the left case and the right case. Attach and remove the other end The mowing blade case has a substantially donut shape when the stopper is stopped, and the left case and the right case have protrusions that cover the edges of the protrusions. A part cover is erected.

  The grass cutting blade according to the present invention is a rotary grass cutting blade provided with an outer peripheral blade formed on the outer periphery of a disk-shaped rotating body, and is located at a position near 1/3 from the outer periphery in the radial direction on the surface of the rotating body. A plurality of projecting portions provided with a wrapping preventing blade portion for preventing wrapping are provided upright at a portion facing the rotation direction of the mowing blade. For this reason, it is possible to prevent stalks such as vine grass from being wound around the rotating shaft of the grass, to prevent the engine from being stopped due to winding, the operation to remove the wound grass, and the like, and a smooth operation can be performed.

  Moreover, the mowing blade case which covers the mowing blade which concerns on this invention is a rotary mowing blade provided with the outer periphery blade formed in the outer periphery of a disk shaped rotary body from the radial outer periphery on the surface of the said rotary body. At least the outer periphery of the grass cutting blade characterized in that a plurality of protrusions provided with a winding prevention blade portion for preventing winding are provided at a position in the vicinity of the grass cutting blade in the rotation direction. A mowing blade case covering the blade and the anti-winding blade portion, wherein the mowing blade case has two left and right cases having a substantially U-shaped cross section covering the outer peripheral blade, and the left and right cases. A hinge portion in which a shaft connecting one end of each of the left and right ends is perpendicular to the surface of the rotating body, and a stopper that can be attached to and detached from the other end of the left case and the right case where the hinge portion is not provided. The mowing blade case Is substantially donut-shaped when the stopper is stopped, and the left case and the right case are provided with a protruding portion cover covering the edge of the protruding portion. To do. The mowing blade case is attached in such a way that the outer peripheral blade is sandwiched from the left and right of the rotating body, so that the mowing blade case can be attached to the mowing blade even when it is attached to the mower. Removal work from the can also be performed safely. In addition, the left and right cases are provided with a protruding portion cover, and the protruding portion cover covers the protruding portion at the same time when the mowing blade case is attached to the cutting blade, so that the protruding portion can be easily touched. It becomes possible to install safely.

  Hereinafter, a mowing blade shown as the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the grass cutting blade 10 is used by being attached to the brush cutter 1. The brush cutter 1 includes a handle portion 2 for a user to support and operate the main body, an engine 3 for rotating the grass cutting blade 10, a transmission shaft 4 for transmitting power from the engine 3 to the grass cutting blade 10, A shaft 5 that is formed into a cylindrical shape and the transmission shaft 4 passes through the cylinder, a gear portion 6 that transmits the power of the transmission shaft 4 to the cutting blade 10 at the tip of the shaft 5, and a shaft 5 near the cutting blade 10 such as a stone. It is comprised from the scattering prevention cover 7 which prevents scattering.

  As shown in FIG. 2, the grass cutting blade 10 includes a disk-shaped base body 11, a large number of saw blades 12 provided on the outer periphery of the base body 11, and a mounting hole 13 for mounting the brush cutter 1 at the center of the base body 11. The protrusion 11 is formed by cutting and raising the base 11 on the main surface 11 a of the base 11, and the wrapping prevention blade 15 provided on the protrusion 14.

  The base body 11 is formed by forming plate-like steel or the like into a disk shape, and a mounting hole 13 for mounting the brush cutter 1 on the center of the base body 11 is provided. The base 11 can be attached to the brush cutter 1 and can perform grass cutting work efficiently, and its diameter is preferably 255 mm or 230 mm.

  The protrusions 14 are provided on the main surface 11a of the base body 11 at eight equal intervals on the same circumferential track. The projecting portion 14 is formed by cutting the base body 11 into a substantially U shape at a position approximately one third from the outer periphery in the radial direction of the base body 11 and projecting upward when the portion is mounted on the brush cutter 1. The main body 11 is bent substantially perpendicularly to the main surface 11a. Further, the cut-and-raised hole 16 of the base body 11 formed by cutting and protruding the protruding portion 14 is formed on the mounting hole 13 side from the protruding portion 14. The protrusion 14 is provided with a wrapping prevention blade 15 at a portion facing the rotation direction of the mowing blade 10 (arrow A in FIG. 2) in the end edge of the cut and raised protrusion 14.

  The protrusion 14 may have any shape as long as the effect of preventing the curling of stems such as vine grass is most obtained, and the height from the main surface 11a is the gear portion when the rotary shaft of the brush cutter 1 is mounted. Preferably, the height is such that it does not come into contact with the shaft 6 or the shaft 5, for example, about 15 to 16 mm. Further, the protrusion 14 has a width of the bent portion 17 of the protrusion 14 with the base 11 of about 17 to 18 mm, and the upper end portion 18 of the protrusion 14 is cut off without resistance by the anti-winding blade 15. Since the anti-winding blade 15 is inclined to some extent with respect to the main surface 11a, the width is preferably about 10 mm. Further, the protrusions 14 may be provided at a plurality of positions at equal intervals on the same circumferential track, but if the number is too small, the effect cannot be obtained so much. The effect is not obtained, and it is preferable that the number is 8 locations. Furthermore, the protrusion 14 may be provided upright on the base body 11, but if it is provided on the outer peripheral side from a position that is approximately one third from the outer periphery in the radial direction of the base body 11, the main surface 11 a of the protrusion 14 is removed. If the height of the base plate 11 is not increased, a sufficient effect cannot be obtained, which leads to a decrease in the strength of the grass cutting blade 10. Since a sufficient height from the main surface 11a cannot be ensured, an effect cannot be obtained, and it is preferable that the base 11 is provided at a position approximately one third from the outer periphery in the radial direction.

  As shown in FIG. 3, the anti-winding blade 15 is provided in a portion of the end edge of the protruding portion 14 that faces the rotational direction of the mowing blade 10. The winding preventing blade 15 may be a so-called single blade formed on the inner peripheral side in the radial direction of the base body 11 as long as the blade is cut so that the grass of a stem such as vine grass does not wind around the rotating shaft. is there. Further, the anti-winding blade 15 is such that the cutting edge angle of the blade is too large to increase the cutting resistance and the sharpness does not deteriorate, and conversely, the cutting edge is sharpened to reduce the cutting resistance and the cutting edge is not easily chipped. What is necessary is just a thing, and the thing whose edge angle is about 30 degrees is preferable. In addition, in FIG. 3, the example of the single-blade formed on the inner peripheral side in the radial direction of the base body 11 is shown as the anti-winding blade 15, but not limited thereto, the strength near the bent portion 17 is sufficiently maintained. As long as it is possible, a double-edged blade or a single-edged blade formed on the outer peripheral side in the radial direction of the base 11 may be used.

  The cut-and-raised hole 16 is a vacant hole formed by cutting the base 11 and bending it at the bent portion 17 to form the protruding portion 14. Since the cut-and-raised hole 16 is a hole that can be formed by raising and lowering the protruding portion 14, the cut-and-raised hole 16 has the same shape as the protruding portion 14. Such an impact can be buffered.

  The cut-and-raised hole 16 is not limited to the above-described one, and may be lightened to such an extent that the strength of the grass cutting blade 10 does not decrease. The cut-and-raised hole 16 is larger than the protruding portion 14 so that the shock can be uniformly buffered. You may make it give a corner roundness.

  Next, how the grass of a stem such as vine grass is prevented from being wound around the rotating shaft by using the grass cutting blade 10 will be described. As shown in FIG. 4, the grass cutting blade 10 is attached to a rotary shaft 8 that is pivotally supported by the gear portion 6 of the brush cutter 1 and protrudes downward with a bolt (not shown).

  When the engine 3 of the brush cutter 1 is started by the user, the rotating shaft 8 rotates through the transmission shaft 4 and the gear portion 6, and the grass cutting blade 10 also rotates. The user can perform the mowing work by using the handle 2 and applying the grass for mowing to the saw blade 12 of the rotating mowing blade 10. In addition, even when grass that grows in a depressed state or stalks that are long and stretched like vines tend to wrap around the rotary shaft 8 or the gear portion 6, it is provided on the protruding portion 14. The wrapping prevention blade 15 can be cut short and wrapping can be prevented.

  Next, a case where the user covers the blade of the grass cutting blade 10 so as not to be injured by the saw blade 12 or the anti-winding blade 15 when the grass cutting operation is not performed or when the grass cutting blade 10 is replaced will be described.

  As shown in FIG. 5, the mowing blade case 50 covering the saw blade 12 and the anti-winding blade 15 of the mowing blade 10 has one end of each of the right case 50R, the left case 50L, the right case 50R, and the left case 50L. , A stopper 52 provided at the other end of the right case 50R to which the hinge portion 51 is not attached, and a protrusion provided at the other end of the left case 50L to which the hinge portion 51 is not attached. 53 and a protrusion cover 54 that covers the protrusions 14 provided on the right case 50R and the left case 50L.

  The right case 50R and the left case 50L are made of a material such as polypropylene. Each of the right case 50R and the left case 50L has a substantially U-shaped cross section and has a half of a donut shape, and is attached to the grass cutting blade 10 as shown in FIG. When the saw blade 12 is covered with a substantially donut shape.

  The right case 50R includes a right upper surface portion 55R having a substantially donut-shaped half shape, a right lower surface portion 56R provided approximately 1 cm wider radially inward than the right upper surface portion 55R, and an outer periphery of the right upper surface portion 55R and the right lower surface portion 56R. The right outer peripheral surface portion 57R having a height larger than the thickness of the base body 11 along the side is configured to have a substantially U-shaped cross section.

  The left case 50L is formed on the outer peripheral side of a left upper surface portion 55L having a substantially donut-shaped half shape, a left lower surface portion 56L provided approximately 1 cm wider radially inward than the left upper surface portion 55L, and the left upper surface portion 55L and the left lower surface portion 56L. The left outer peripheral surface portion 57 </ b> L having a height larger than the thickness of the along base 11 is configured to have a substantially U-shaped cross section.

  The right upper surface portion 55R, the right lower surface portion 56R, the left upper surface portion 55L, and the left lower surface portion 56L are provided with a cut portion A parallel to the radial direction from the inner peripheral side at a position that bisects each. The cut portion A is configured such that a material hinge, that is, a member on the outer peripheral side of the cut portion A functions as a hinge. This is a portion that is provided so as to be more easily fitted when a projection cover 54 described later is fitted so as to cover the projection 14 of the grass cutting blade 10. The cut portion A is not limited to being provided in the four members of the right upper surface portion 55R, the right lower surface portion 56R, the left upper surface portion 55L, and the left lower surface portion 56L, as described above, but the right lower surface portion 56R and the left lower surface portion 56L. You may make it provide only in a location. Also, the reason why the right lower surface portion 56R and the left lower surface portion 56L are larger on the inner peripheral side than the right upper surface portion 55R and the left upper surface portion 55L is that the saw blade 12 is covered with the right case 50R and the left case 50L. Sometimes, the saw blade 12 serves as a guide that can easily enter between the right upper surface portion 55R and the right lower surface portion 56R and between the left upper surface portion 55L and the left lower surface portion 56L.

  The hinge portion 51 is a member that connects one end of each of the right case 50R and the left case 50L, and is attached in such a direction that the axis of the hinge is perpendicular to the right upper surface portion 55R and the left upper surface portion 55L.

  The stopper 52 is attached to the other end of the right outer peripheral surface portion 57 </ b> R where the hinge portion 51 is not attached, and includes a strip-shaped joining piece 58 and a joining hole 59 provided in the joining piece 58. .

  The protruding portion 53 is attached to the other end of the left outer peripheral surface portion 57 </ b> L where the hinge portion 51 is not attached, and has a substantially spherical protruding portion whose tip has a diameter substantially the same as that of the joint hole 59.

  The stopper 52 and the projection 53 are engaged by fitting the projection 53 into a joint hole 59 provided in the joint piece 58. The stopper 52 and the protrusion 53 are not limited to those described above, and may be any mechanism that can attach and detach the right case 50R and the left case 50L.

  The protruding portion cover 54 has substantially the same shape as the protruding portion 14, and the surface facing the inner peripheral side is open, and the size thereof is a size that can cover the protruding portion 14. Further, the same number of protrusions 54 as the protrusions 14 are attached to positions where the protrusions 14 can be covered by the right upper surface part 55R and the left upper surface part 55L.

  Next, how the mowing blade case 50 is attached to the mowing blade 10 will be described with reference to the drawings. As shown in FIG. 5, the mowing blade case 50 is open so that the stopper 52 and the protrusion 53 are separated from each other with the hinge 51 as a center. In this state, the saw blade 12 is inserted between the right upper surface portion 55R and the right lower surface portion 56R and between the left upper surface portion 55L and the left lower surface portion 56L so as to cover the saw blade 12 of the mowing blade 10. Next, the right upper surface portion 55R and the right lower surface portion 56R are formed so that the right case 50R and the left case 50L have a substantially donut shape, and all the saw blades 12 of the mowing blade 10 are covered. And between the left upper surface portion 55L and the left lower surface portion 56L. Further, all of the saw blade 12 is covered and at the same time, the protruding portion 14 is fitted into the protruding portion cover 54. Finally, as shown in FIG. 6, when all the saw blades 12 and the anti-winding blades 15 of the protrusions 14 are covered, the protrusions 53 are inserted into the joint holes 59 of the stoppers 52 and engaged. Thus, the mowing blade case 50 can be attached to the mowing blade 10.

  As described above, the right case 50R and the left case 50L are not limited to being made of a material such as polypropylene, and may be any material that is strong and has a certain degree of elasticity, such as polyaminotriazole.

  Further, as described above, the protrusions 14 provided on the mowing blade 10 are not limited to those provided on the same circumference, and for example, as shown in FIG. 7, the protrusions are provided on the same circumference. It may be the case.

  As shown in FIG. 7, the grass cutting blade 20 includes a disk-shaped base body 11, a plurality of saw blades 12 provided on the outer periphery of the base body 11, and a mounting hole 13 for mounting the brush cutter 1 at the center of the base body 11. The protrusions 14a and 14b are formed by cutting and raising the base 11 on the main surface 11a of the base 11, and the anti-winding blade 15 is provided on the protrusions 14a and 14b. In addition, the same code | symbol is attached | subjected to the thing similar to the grass cutting blade 10, and the description is abbreviate | omitted.

  The protruding portions 14 a and 14 b have the same shape as the protruding portion 14, but are provided at two different positions in the radial direction of the base body 11. That is, the protrusions 14a and 14b provided at eight places are two of a protrusion 14a provided at a position close to the mounting hole 13 and a protrusion 14b provided at a position closer to the saw blade 12 than the protrusion 14a. There are staggered types of protrusions. In this way, it is possible to prevent stalks such as vine grass from being wound around the rotating shaft of grass at any position on the base 11 of the mowing blade 20.

  Further, the protrusion 14 provided on the mowing blade 10 is not limited to the protrusion 14 provided substantially vertically with respect to the base 11 as described above, and as shown in FIG. It is also possible to combine the projecting portions in the state of FIG.

  As shown in FIG. 8, the grass cutting blade 30 includes a disk-shaped base body 11, a large number of saw blades 12 provided on the outer periphery of the base body 11, and a mounting hole 13 for mounting the brush cutter 1 at the center of the base body 11. The protrusions 14d, 14e, and 14f are formed by cutting and raising the base 11 on the main surface 11a of the base 11, and the winding prevention blade 15 is provided on the protrusions 14d, 14e, and 14f. In addition, the same code | symbol is attached | subjected to the thing similar to the grass cutting blade 10, and the description is abbreviate | omitted.

  The protruding portions 14d, 14e, and 14f have the same shape as the protruding portion 14, but are provided in three different states that are cut and raised with respect to the main surface 11a of the base 11. In other words, the protrusions 14d, 14e, and 14f provided at eight locations are the protrusion 14d in a state where the cut-and-raised protrusion is half-raised, and the protrusion 14e in which the cut-and-raised protrusion is substantially vertical. Three types of protrusions are provided, with the protrusion 14f in a state in which the cut and raised protrusion is substantially folded back. In this way, it is possible to prevent stalks such as vine grass from being wound around the rotating shaft of grass at any position on the base 11 of the mowing blade 30.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  For example, although the mowing blades 10, 20, and 30 have been described with respect to the protruding portion that cuts and raises the base 11, the present invention is not limited thereto, and the protruding portion may be fixed with a bolt or the like by making a hole in the base.

It is the figure which showed a mode that the mowing blade concerning this invention was mounted | worn with the brush cutter. 1 is a perspective view of a grass cutting blade according to the present invention. It is the figure which showed the protrusion part of the mowing blade which concerns on this invention. It is a principal part perspective view which shows the state which mounted | wore the brush cutter with the grass cutting blade which concerns on this invention. It is the figure which showed the grass-cutting blade case which covers the grass-cutting blade which concerns on this invention. It is the figure which showed a mode that the mowing blade case which covers the mowing blade which concerns on this invention was attached to the mowing blade. It is the perspective view which showed 2nd Embodiment of the grass-cutting blade which concerns on this invention. It is the perspective view which showed 3rd Embodiment of the mowing blade which concerns on this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Brush cutter, 2 Handle, 3 Engine, 4 Transmission shaft, 5 Shaft, 6 Gear part, 7 Splash prevention cover, 8 Rotating shaft, 10 Grass cutting blade, 11 Base, 12 Saw blade, 13 Mounting hole, 14 Protruding part, 15 Winding prevention blade, 16 cut-and-raised hole, 17 bent portion, 18 upper end portion, 50 mowing blade case, 51 hinge portion, 52 stopper, 53 protrusion portion, 54 protrusion portion cover

Claims (3)

A mowing blade provided with an outer peripheral blade formed on the outer periphery of a disk-shaped rotating body,
A plurality of protrusions in which an anti-winding blade portion is formed at a position facing the rotation direction of the mowing blade at a position in the vicinity of 1/3 of the radius of the rotation body from the outer periphery in the radial direction on the main surface of the rotation body. A mowing blade characterized in that is provided. 2. The mowing blade according to claim 1, wherein the protrusions are erected substantially perpendicularly to the surface of the rotating body at eight equal intervals on the same circumference on the main surface of the rotating body. . A mowing blade provided with an outer peripheral blade formed on the outer periphery of a disc-shaped rotating body is provided at a position near one third of the radius of the rotating body from the outer periphery in the radial direction on the main surface of the rotating body. A grass cutting blade case covering at least the outer peripheral blade of the grass cutting blade and the winding prevention blade portion, wherein a plurality of protrusions formed with a winding prevention blade portion are provided at a portion facing the rotation direction,
Two left cases and a right case having a substantially U-shaped cross section covering the outer peripheral blade,
A hinge part in which a shaft connecting one end of each of the left case and the right case is perpendicular to the surface of the rotating body;
The left case and the right case have a stopper that is detachable at the other end where the hinge portion is not provided,
The mowing blade case has a substantially donut shape when the stopper is mounted, and the left case and the right case are provided with a protrusion cover that covers the edge of the protrusion. Characteristic mowing blade case.

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