JP3103051U - Rotary blade and package for rotating blade for brush cutter - Google Patents

Abstract

A rotary cutting blade for a brush cutter and a packaging container for the rotary cutting blade according to the present invention have play (gap) due to respective tolerances between a mounting hole of the rotary cutting blade and a mounting screw shaft in a gear case. Even if the weight of the rotary cutting blade can be reduced, the vibration of the rotary cutting blade in the mowing operation can be easily and reliably reduced, and the structure is simple so that manufacture and assembly can be easily performed. is there.
According to the present invention, there is provided a gear case (4) provided at the tip of an operating rod (3) of a bush cutter in the mounting hole of a cutting blade body (1) having a cutting blade (2) on an outer periphery and a mounting hole (6) provided in the center. The cutting screw body 5 is inserted, and the cutting blade body is detachably attached to the cutting screw body via the nut 7 and the washer 9 via the mounting screw shaft. In addition, a buffer film body 8 made of a synthetic resin flexible sheet S is completely or partially adhered around the mounting hole 6, and a free end 8 a that can be inserted into the mounting hole 6 is provided on the inner peripheral edge of the buffer film body. .
[Selection diagram] Fig. 1

Description

  The present invention relates to a rotary cutting blade for a brush cutter and a packaging container for the rotary cutter blade. The present invention relates to a mounting screw shaft in a gear case provided at the tip of an operating rod of a brush cutter used for mowing, and the mounting screw shaft and the mounting screw shaft. The cutting blade body is attached to the mounting screw shaft in a structurally robust manner without being vibrated or rattling by being interposed in a play due to a tolerance with a mounting hole provided in the mounted cutting blade body.

Conventionally, for example, a rotary mowing blade for a brush cutter inserts a mounting screw shaft in a gear case provided at the tip of an operating rod of the brush cutter into a mounting hole provided at the center of the cutting blade body, and a washer, Mounting was performed by tightening using a nut or the like. The mounting hole of the rotary cutting blade and the mounting screw shaft in the gear box are formed with tolerances.
According to JIS, the tolerance of the mounting hole is defined to be 0 mm to +0.15 mm, so that the mounting holes of many rotary cutting blades are formed with a plus tolerance. Further, the mounting screw shaft of the gear case is formed with a minus tolerance in consideration of the tolerance of the rotary cutting blade. Therefore, when the mounting screw shaft is assembled in the mounting hole of the rotary cutting blade, a play (gap) always occurs due to tolerance. Considering this tolerance, the mounting screw shaft and the mounting hole may be assembled with an eccentricity of about 0.1 mm.
Further, the brush cutter is weighed from the viewpoint of easy handling, and not only the brush cutter but also the rotary blade itself is easy to handle, and the weight is reduced in consideration of safety. Then, among the components of the rotating system of the brush cutter, the rotating blade occupies a large degree (for example, see Patent Document 1).

Also, for storing the rotating blades for the brush cutter, or as a packaging container to be packed for transportation, the upper edge of the backing side of the packaging mount portion formed to have an area to accommodate the rotating blades, On the lower and left edges, small folded pieces are connected to be able to bend inward so as to wrap the rotary cutting blade, and on one side of the packaging mount, a cover paper that is approximately the same size as the packaging mount. A box-shaped part in which the insertion part protruding from the bent piece on the other side is provided so as to be able to be inserted and removed in an insertion hole provided on the side edge of the cover paper part There is.
JP-A-2002-360029

  However, in the rotary cutting blade for a brush cutter described in Patent Document 1, the mounting hole of the rotary cutting blade and the mounting screw shaft in the gear box are formed with a plus tolerance according to JIS. Further, since the mounting screw shaft of the gear case is formed with a minus tolerance, if the mounting screw shaft is assembled in the mounting hole of the rotary cutting blade, a play (gap) will always occur due to the tolerance. The shaft and the mounting hole are assembled with an eccentricity of about 0.1 mm. Therefore, in a normal operation, the mowing operation is performed at an engine speed of about 6,000 rpm, and when the rotary cutting blade is rotated, the rotary cutting blade is eccentrically rotated, so that a so-called blur occurs. The disadvantage is that the vibration is increased. The cause of the vibration of the rotating blade is that the shape of the rotating blade is formed unevenly, and between the mounting hole of the rotating blade and the mounting screw shaft in the gear box as described above. This causes a play (gap) due to the tolerance of the above. In addition, the vibrations appear more remarkably because the weight of the rotary blade itself is reduced.

  The present invention solves the above-mentioned disadvantages of the prior art, and creates play (gap) between the mounting hole of the rotary cutting blade and the mounting screw shaft in the gear box of the brush cutter according to the respective tolerances. Even if the weight is reduced, it is easy and reliable to reduce the vibration of the rotary cutting blade in the brushing operation, and the structure is simple, the manufacturing and assembly can be easily performed, and the manufacturing cost is low. It is an object of the present invention to provide a rotary blade and a packaging container for the rotary blade.

  The present invention has been made in view of the above problems, and the invention according to claim 1 has a cutting blade on an outer periphery and a tip of an operating rod of a brush cutter in the mounting hole of a cutting blade body provided with a mounting hole at a center. In the rotary cutting blade for a brush cutter in which a mounting screw shaft in a gear case provided in the device is inserted, and the cutting blade body is detachably mounted to the mounting screw shaft via a nut, a washer, or the like, at least the cutting blade body is provided. On one side, a buffer film made of a synthetic resin flexible sheet is completely or partially adhered around the mounting hole, and an inner peripheral edge of the buffer film is provided with a free end that can be inserted into the mounting hole. The feature that was characterized by was adopted.

  According to a second aspect of the present invention, in the first aspect, the buffer film body has an overall shape formed in a substantially annular shape in a plane, and a hole having a diameter smaller than the mounting hole is provided at the center. In this case, the free end is used.

  According to a third aspect of the present invention, in the first aspect, the buffer film body is formed in a plane semi-annular shape as a whole, and has an arc-shaped inner edge having a diameter smaller than the mounting hole at the center. Is provided so as to form the free end.

  According to a fourth aspect of the present invention, the cutting blade body is covered and covered with a large-diameter synthetic resin flexible sheet according to any one of the first, second, and third aspects. The flexible sheet has the remaining portion occupied by the cutting blade main body adhered to the backing paper, and the synthetic resin flexible sheet includes a contour portion of the buffer film body and an outer edge portion of the synthetic resin flexible sheet to the contour portion. A perforation line or a cutting line is provided, and the buffer film body surrounded by the contour portion is provided so as to be able to remain around the mounting hole of the cutting blade main body through the perforation line or the cutting line. Adopted.

  According to a fifth aspect of the present invention, in the first, second, third, and fourth aspects, a company name, a product name, A means is adopted in which a display unit composed of an appropriate display means such as printing, such as a slogan, a handling instruction, and a notice, is displayed.

  In the invention according to claim 6 of the present invention, a mounting screw shaft in a gear case provided at a tip of an operating rod of a brush cutter is inserted into a mounting hole provided at a center of a cutting blade body having a cutting blade on an outer periphery. A cutting blade body detachably mounted to the mounting screw shaft via a nut, a washer, or the like, for packaging a rotary cutting blade for a brush cutter, and a packing board part slightly larger in diameter than the rotary cutting blade. The upper edge, the lower edge, and the left edge are connected to each other so as to bendable inwardly so as to wrap the cutting blade body in three sides of the cutting edge body. The same-sized cover paper part is connected to be openable and closable, and the insertion piece part projecting from the bent piece on the other side is provided so as to be able to be inserted and removed in the insertion hole provided on the side edge of the cover paper part. The inner peripheral edge of a cushioning membrane made of a synthetic resin flexible sheet adhered to all or part of the periphery of the mounting hole provided in the cutting blade body on the inner surface of the packaging container The fitting portion which is fitted adopted means that were characterized by being 突成.

  In the invention according to claim 7 of the present invention, the cutting blade body is covered and covered with a large-diameter synthetic resin flexible sheet, and the remaining portion of the synthetic resin flexible sheet occupied by the cutting blade body is attached to a backing sheet. The synthetic resin flexible sheet has a portion surrounding the contour of the cushioning film body which is entirely or partially adhered around the mounting hole of the cutting blade body, and the contour from the outer edge of the synthetic resin flexible sheet. Part is provided with a perforated line or a cut line, and the buffer film body surrounded by the contour portion is left and adhered around the mounting hole of the cutting blade body via the perforated line or the cut line. The feature that was characterized by was adopted.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides a play (gap) between the mounting hole of the cutting blade main body and the mounting screw shaft in the gear box of the brush cutter due to the respective tolerances, or the cutting blade. Even if the weight of the main body is reduced, vibration of the cutting blade main body in the mowing operation can be easily and reliably reduced, and the structure is simple, manufacturing and assembly can be easily performed, and the manufacturing cost is reduced. .

  Hereinafter, the present invention will be described in detail according to the best mode for carrying out the present invention with reference to the drawings.

  FIG. 1 is an exploded perspective view showing a rotary cutting blade for a brush cutter according to a first embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the rotary cutting blade assembled, FIG. 3 is a plan view, and FIG. FIG. 5 and FIG. 5 are enlarged sectional views showing the blade main body 1 constituting the first embodiment.

  This embodiment 1 has a plurality of cutting blades 2 on the outer periphery, and a gear case 4 provided at the tip of the operating rod 3 of the brush cutter in the mounting hole 6 of the cutting blade body 1 provided with a mounting hole 6 at the center. The cutting screw body 5 is inserted, and the cutting blade main body 1 is detachably attached to the mounting screw shaft 5 via a nut 7, a washer 9 and the like. On at least one side, a buffer film body 8 made of a synthetic resin flexible sheet S is adhered over the entire periphery of the mounting hole 6, and the inner peripheral edge of the buffer film body 8 has a free end 8 a that can be inserted into the mounting hole 6. Provided. The free end 8a is formed so as to be free from the inner peripheral side of the mounting hole 6 by a few mm to a few cm, and is mounted by inserting the mounting screw shaft 5 of the gear case 4 into the mounting hole 6 of the cutting blade body 1. When the cutting blade main body 1 is mounted on the screw shaft 5, the cutting edge body 9 a of the washer 9 is pressed outward (in the radial direction) so that the free end 8 a comes into contact with the inner peripheral surface of the mounting hole 6 beforehand. Desirably, it will be biased in the direction.

  In the first embodiment, as shown in FIG. 3, the buffer film body 8 is formed in a substantially annular planar shape, and a hole 8b having a diameter smaller than that of the mounting hole 6 is provided at the center. I have.

  As the synthetic resin flexible sheet S on which the buffer film body 8 is to be formed, a flexible sheet made of a thermoplastic synthetic resin, for example, polyethylene, polypropylene, polystyrene, polyamide resin, or polycarbonate resin is optimally used. Then, in order to attach the buffer film body 8 made of the synthetic resin flexible sheet S around the mounting hole 6 of the cutting blade main body 1, the synthetic resin flexible sheet S is bonded using, for example, an adhesive or hot. It can be heated and bonded using a melt adhesive.

  In addition, for example, a company name and a product name are displayed on the buffer film body 8 by appropriate display means such as printing, so that when the buffer film body 8 is used while being adhered to the cutting blade body 1, it is displayed at the time of use. In addition to assuring the product as an index of the product, the cutting edge body is displayed by displaying desired items such as slogans, handling instructions, and precautionary notes as the display unit 10 including appropriate display means such as printing. It is possible to accurately grasp the handling method (1) and to call attention.

  The first embodiment is configured as described above, and the cutting blade main body 1 having the plurality of cutting blades 2 on the outer periphery is mounted on the mounting screw shaft 5 in the gear case 4 provided at the tip of the operating rod 3 of the brush cutter, or To remove the cutting blade body 1, the upright wall 9 a of the washer 9 is inserted into a mounting hole 6 provided in the center of the cutting blade body 1, and the mounting screw shaft 5 is connected to the cutting screw shaft 5 through the washer 9. The cutting blade main body 1 can be attached to and detached from the mounting screw shaft 5 by inserting it into the mounting hole 6 provided in the center of the main body 1 and screwing the nut 7 to the mounting screw shaft 5 or by retreating. This is the same handling and mounting method as the conventional rotary cutting blade of the brush cutter.

However, in the first embodiment, at least one surface of the cutting blade main body 1 is made of the synthetic resin flexible sheet S, and the entire shape is formed to be substantially annular in a plane as shown in FIG. The buffer film body 8 provided with the hole 8b is adhered over the entire periphery of the mounting hole 6, and the inner peripheral edge of the hole 8b of the buffer film body 8 can be inserted into the mounting hole 6. Since the loose end 8a is protruded from the inner side of the mounting hole 6 by about several mm to several cm, the mounting screw shaft 5 of the gear case 4 is inserted into the mounting hole 6 of the cutting blade body 1. When the cutting blade main body 1 is mounted on the mounting screw shaft 5, the free end 8 a of the buffer film body 8 released in the mounting hole 6 of the cutting blade main body 1 becomes the upright wall portion 9 a of the washer 9 into which the mounting screw shaft 5 is inserted. Is pressed outward (in the radial direction), so that it is interposed so as to contact the inner peripheral surface of the mounting hole 6.
At this time, the free end 8a of the buffer film body 8 is pressed by the upright wall portion 9a of the washer 9 to which the mounting screw shaft 5 of the gear case 4 is inserted into the mounting hole 6 of the cutting blade body 1 and is mounted. It is desirable that the mounting hole 6 be urged in the radial direction in advance so as to contact the inner peripheral surface.

  As described above, between the mounting screw shaft 5 of the gear case 4 and the mounting hole 6 of the cutting blade body 1, a thermoplastic synthetic resin adhered around the mounting hole 6, for example, polyethylene, polypropylene, polystyrene, or polyamide. A free end 8a formed of a synthetic resin flexible sheet S made of resin, polycarbonate resin or the like and projecting from the inner peripheral edge of the hole 8b of the substantially annular buffer film body 8 is interposed on the inner peripheral surface of the mounting hole 6. When the rotary cutting blade is rotated in a normal cutting operation in which the rotation speed of the engine of the brush cutter is rotated at about 6,000 rpm, the cushioning film body 8 and the inner peripheral edge are contacted. The vibration of the rotary cutting blade is reduced by the soft buffering action exerted by the protruding free end 8a.

The tolerance of the mounting hole 6 between the mounting hole 6 provided on the rotary cutting blade and the mounting screw shaft 5 in the gear case 4 is defined as a plus tolerance between 0 mm and +0.15 mm in JIS. The screw shaft 5 is formed with a minus tolerance, so that when the mounting screw shaft 5 is assembled in the mounting hole 6 of the rotary cutting blade, a play (gap) always occurs due to the tolerance. The free end 8a of the buffer film body 8 is interposed between the mounting hole 6 of the cutting blade body 1 and the upright wall 9a of the washer 9, even when the mounting hole 6 is assembled with an eccentricity of about 0.1 mm. Since the cutting blade main body 1 is mounted so that the free end 8a fills the gap caused by the eccentricity, the vibration of the rotary cutting blade due to the vibration is smoothly and reliably reduced.
In addition, the lawn mower is weighed from the viewpoint of easy handling, and the rotating blade itself is easy to handle. Even if the weight is reduced in consideration of safety, the vibration of the rotating blade is reduced. Smooth and reliable reduction.

  In addition, for example, the above-described substantially annular buffer film body 8 of the first embodiment, which is formed in a substantially annular shape by the synthetic resin flexible sheet S and is attached around the mounting hole 6 of the cutting blade main body 1, includes In addition to displaying the company name and product name by appropriate display means such as printing, as well as guaranteeing the product as an index of the product, displaying desired items such as slogans, handling instructions, precautionary notes etc. by appropriate display means such as printing Since the section 10 is displayed, for example, the company name, product name, product index, quality, slogan, handling explanation, precautions, etc. of the cutting blade main body 1 can be accurately grasped through the display section 10 to assist use. Make

  Further, in the above description, the cushioning film body 8 made of the synthetic resin flexible sheet S adhered to the periphery of the mounting hole 6 of the cutting blade main body 1 is formed in a substantially annular shape so that the cutting blade main body 1 has a substantially annular shape. Although the case of sticking the entirety around the mounting hole 6 is described as a representative, the buffer film body 8 is not limited to, for example, the one shown in FIG. The two buffer membranes 8 are formed around the mounting hole 6 of the cutting blade main body 1 around the center so that an arc-shaped inner edge portion having a smaller diameter than the mounting hole 6 is provided at the center. In the same manner as in the first embodiment, the attachment screw shaft 5 of the gear case 4 is inserted in the attachment hole 6 of the blade main body 1 in a case where the attachment is partially and entirely concentric with the attachment hole 6 as a center. When the cutting blade main body 1 is attached to the mounting screw shaft 5 by insertion, the cutting blade main body 1 is released into the mounting hole 6 of the cutting blade main body 1. The free end 8a of the buffer film body 8 is pressed outwardly (in the radial direction) against the upright wall 9a of the washer 9 into which the mounting screw shaft 5 is inserted, and is interposed so as to contact the inner peripheral surface of the mounting hole 6. Is done. When the rotary cutting blade is rotated, the cushioning film body 8 and the free end 8a protruding from the inner peripheral edge exhibit a soft buffering action, which reduces the vibration and the like of the rotary cutting blade. is there. Although not shown in the figure, even when the buffer film body 8 is further subdivided and is attached concentrically around the mounting hole 6 around the mounting hole 6 provided in the cutting blade body 1, the buffer film body 8 may be used. In addition, the function and effect of reducing the vibration of the rotary cutting blade can be exhibited by the soft buffering action of the free end 8a protruding from the inner peripheral edge.

FIGS. 7 and 8 show a first embodiment of a packaging container used for packing the rotary blade for the brush cutter according to the present invention.
This embodiment 2 has a cutting blade 2 on the outer periphery, and is detachably attached to a mounting screw shaft 5 in a gear case 4 provided at a tip of an operating rod 3 of a brush cutter using a nut 7, a washer 9 and the like. This is a packaging container for packing a rotary blade for a brush cutter.
The packaging container 20 wraps the narrow cutting pieces 22, 23, and 24 in three directions of the upper edge, the lower edge, and the left edge of the packaging mount 21 having a diameter larger than that of the cutting blade body 1 so as to wrap the cutting blade body 1. At the side of the packaging mount 21, the right side in the drawing, a cover paper 25 having substantially the same size as the packaging mount 21 is connected to be openable and closable. In this case, the insertion piece 24a projecting from the open edge of the bent piece 24 on the left side is formed so as to be able to be inserted and removed in an insertion hole 26 provided on the side edge of the cover sheet 25.
In addition, at the approximate center of the inner surface of the packaging container 20, the inner peripheral edge (hole) of the buffer film body 8 made of the synthetic resin flexible sheet S adhered to all or a part of the periphery of the mounting hole 6 provided in the cutting blade main body 1. This is a configuration in which a fitting portion 27 to be fitted into the portion 8b) is formed as a protrusion.

Then, in order to pack the rotary cutting blade for the brush cutter, the packaging container 20 of the packaging container 20 having a diameter larger than the cutting blade body 1 and the upper, lower, and left edges of the packaging substrate 21 The cutting blade main body 1 is wrapped by bending inwardly the narrow cutting pieces 22, 23, 24 which are continuously provided so as to be bent in three directions.
Next, after closing a cover sheet section 25 provided on the right side of the packaging board section 21 to be substantially the same size as the packaging board section 21 with respect to the packaging board section 21, a difference formed in the bent piece 24 on the left side is formed. The cutting piece main body 1 is sandwiched between the packaging mount 21 and the cover paper portion 25 by inserting the insertion piece portion 24a into the insertion hole 26 provided on the side edge of the cover paper portion 25 and rotated into the packaging container 20. The point that the cutting blade is packed is similar to the operation and packing procedure of this type of conventional packaging container.

  However, in the packaging container 20 of the present embodiment, a buffer film made of a synthetic resin flexible sheet S such as, for example, polyethylene, polypropylene, polystyrene, polyamide resin, or polycarbonate resin attached around the mounting hole 6 provided in the cutting blade body 1. Since the fitting portion 27 protruding from the inner surface of the packaging container 20 is fitted into the hole 8 b of the body 8, the fitting portion 27 is attached to the periphery of the mounting hole 6 of the cutting blade main body 1. By being fitted into the hole 8b of the annular buffer film body 8 made of the synthetic resin flexible sheet S, the cutting blade main body 1 can be reliably held by the fitting portion 27 in the packed packaging container 20.

  The free end 8a projecting from the inner peripheral edge of the annular buffer film body 8 made of the thermoplastic synthetic resin flexible sheet S stuck around the mounting hole 6 of the cutting blade main body 1 The free end 8a of the cushioning film body 8 is inserted into the hole 8b through the free end 8a because the fitting portion 27 protruding from the inner surface of the packaging container 20 is fitted into the hole 8b through the free end 8a. By being interposed in the hole 6, no play (gap) occurs between the hole 6 and the fitting portion 27. Then, the cutting blade main body 1 is packed in the packaging container 20 without inadvertently shifting or rattling due to the soft buffering action of the free end 8a of the buffer film body 8. Therefore, the cutting blade 2 of the cutting blade main body 1 packed in the packaging container 20 is prevented from colliding with the inner wall of the packaging container 20, thereby preventing the packaging container 20 from being damaged and protecting the cutting blade main body 1 reliably. Can be packed in the packaging container 20, and can be safely stored and transported.

  9 and 10 show another embodiment 2 of the packaging container of the rotary cutting blade for the brush cutter according to the present invention.

In this embodiment, the buffer film body 8 attached around the mounting hole 6 of the cutting blade main body 1 is formed so as to constitute a part of a packaging container 20 ′ for packing the cutting blade main body 1.
That is, in the second embodiment, when the cutting blade body 1 is packed, the surface of the cutting blade body 1 is covered and covered with the synthetic resin flexible sheet S ′ having a diameter larger than that of the cutting blade body 1, so that the cutting blade body 1 is packaged. The occupied outer peripheral portion 31 is attached to the mount 21 'of the packaging container 20' disposed on the back side of the cutting blade main body 1, and the synthetic resin flexible sheet S 'is provided with a mounting hole for the cutting blade main body 1. 6 around the outer peripheral portion 33 of the cushioning film body 8 and the outer peripheral portion 33 of the synthetic resin flexible sheet S '. A perforation line M or a cutting line is provided up to the contour portion 32, and the buffer film body 8 surrounded by the contour portion 32 at the time of opening the periphery of the mounting hole 6 of the cutting blade body 1 through the perforation line M or the cutting line. And remains adhered to the other synthetic resin flexible sheet S It is without the configuration being peeled from the mount portion 21 'Unpacking of the cutting body 1.

The cutting blade main body 1 is covered and covered with a large-diameter synthetic resin flexible sheet S ′, and the remaining portion 31 on the outer peripheral side occupied by the cutting blade main body 1 in the package is attached to the mount 21 ′ of the packaging container 20 ′. The cutting blade body 1 is rationalized in manufacturing the packaging container 20 'when the cutting blade body 1 is packed, and the cutting blade body 1 is elastically held from the periphery at the time of packing by the synthetic resin sheet S' having a large diameter. Therefore, packing can be performed with the cutting blade body 1 in the packaging container 20 ′ reliably prevented from being inadvertently displaced and rattled, and the cutting blade 2 of the cutting blade body 1 is attached to the packaging container 20 ′. Storage and transportation are easier and more reliable because damage to the inner wall due to collision is prevented.
Further, if a transparent material is used for the synthetic resin flexible sheet S ', the cutting blade body 1 packed in the large-diameter synthetic resin flexible sheet S' is not opened and the packaging container 20 'is externally kept packed. The type, material, size, etc. of the cutting blade main body 1 inside can be checked, which is convenient for selecting a desired cutting blade main body 1 and managing storage and quality.

  In the above description, the overall shape of the cushioning film body 8 adhered to the periphery of the mounting hole 6 of the cutting blade main body 1 is substantially as shown in FIGS. The inner peripheral edge of the buffer film body 8 stuck around the mounting hole 6 of the cutting blade main body 1 is formed into an annular shape or a substantially semi-annular shape as shown in FIG. Therefore, when the cutting blade main body 1 is mounted on the mounting screw shaft 5 of the gear case 4 as shown in FIG. 2, the free end 8 a of the buffer film body 8 inserted into the mounting hole 6 of the cutting blade main body 1. After inserting the upright wall 9a of the washer 9 into the hole 8b of the buffer film body 8, the mounting screw shaft 5 is further inserted into the washer 9 and tightened and fixed by the nut 7 so that the cutting blade body 1 Is attached to the mounting screw shaft 5, the buffer film 8 and the free end 8a protruding from the inner peripheral edge of the buffer film 8 When the rotating blade is rotated in a normal cutting operation in which an impact action is exerted and the engine speed of the brush cutter is rotated at about 6,000 rpm, the vibration of the rotating blade is reduced. Although the present invention is not limited to this and is not shown in the drawings, the surface of the synthetic resin flexible sheet S, S 'with respect to the cutting blade body 1 is formed in a corrugated shape, or is formed on a rough surface such as a matte surface. The application of the present invention is also effective in providing the cushioning action of the synthetic resin flexible sheets S and S 'to the cutting blade main body 1 and thereby effectively preventing the sliding by increasing the frictional resistance.

  According to the present invention, even if play (gap) occurs due to the respective tolerance between the mounting hole of the rotary cutting blade and the mounting screw shaft in the gear case, and even if the weight of the rotary cutting blade is reduced, the cutting can be performed. It is easy and reliable to reduce the vibration of the rotary cutting blade in the wiping operation, and has a simple structure, so that it can be easily manufactured and assembled, and is suitable for fields and applications where the manufacturing cost is low.

FIG. 1 is a perspective view showing Embodiment 1 of a rotary cutting blade for a brush cutter according to the present invention. FIG. 2 is an enlarged sectional view of the same. FIG. 3 is a plan view of the same. FIG. 4 is a side view of the same. FIG. 5 is an enlarged sectional view showing the cutting blade body. FIG. 6 is a plan view showing Embodiment 2 of the rotary cutting blade of the present invention. FIG. 7 is a perspective view showing Embodiment 1 showing the packaging container of the rotary cutting blade for the brush cutter of the present invention. FIG. 8 is an exploded perspective view of the same. FIG. 9 is an exploded perspective view showing a second embodiment of the packaging container of the rotary cutting blade for the brush cutter of the present invention. FIG. 10 is a perspective view showing a state in which the synthetic resin flexible sheet is peeled off and opened.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Cutting blade main body 2 Cutting blade 3 Operating rod 4 Gear case 5 Mounting screw shaft 6 Mounting hole 7 Nut 8 Buffer membrane 8a Free end 8b Hole 9 Washer 9a Standing wall 10 Display unit 20 Packaging container 20 'Packaging container S Synthetic resin flexible Sheet S 'Synthetic resin flexible sheet M Sewing wire

Claims (7)

  A cutting screw is provided on the outer periphery, and a mounting screw shaft in a gear case provided at the tip of the operating rod of the brush cutter is inserted into the mounting hole of the cutting blade body in which the mounting hole is provided at the center. In a rotary cutting blade for a brush cutter to which the cutting blade body is detachably attached via a nut, a washer, or the like, a buffer film made of a synthetic resin flexible sheet is provided on at least one surface of the cutting blade body around the mounting hole. A rotary cutting blade for a brush cutter, characterized in that a free end is provided on the inner peripheral edge of the buffer membrane body which can be inserted into the mounting hole. 2. The free end of the buffer film body according to claim 1, wherein the buffer film body is formed in a substantially annular shape in a plane and provided with a hole having a diameter smaller than the mounting hole in the center. Rotary blades for brush cutters. The said buffer film body is formed as the said free end by the whole shape being formed in the plane substantially semi-annular shape, and providing the arc-shaped inner edge part whose diameter is smaller than the said mounting hole in the center. 2. A rotary cutting blade for a brush cutter according to claim 1. The cutting blade body is covered and covered with a large-diameter synthetic resin flexible sheet, and the remaining portion of the synthetic resin flexible sheet occupied by the cutting blade body is attached to a backing paper. A perforation line or a cutting line is provided from a contour portion of the body to an outer edge portion of the synthetic resin flexible sheet to the contour portion, and the buffer film body surrounded by the contour portion is connected to the cutting blade body through the perforation line or the cutting line. The rotary cutting blade for a brush cutter according to any one of claims 1, 2 and 3, wherein the rotary cutting blade is provided so as to be able to remain around the mounting hole. 2. A display unit comprising an appropriate display means such as printing of a company name, a product name, a slogan, a handling instruction, a precautionary note, etc. is displayed on the mount of the buffer film body and / or the packaging container. A rotary cutting blade for a brush cutter according to any one of claims 2, 3 and 4. A mounting screw shaft in a gear case provided at the tip of the operating rod of the brush cutter is inserted into a mounting hole provided in the center of a cutting blade body having a cutting blade on the outer periphery, and cut into the mounting screw shaft via a nut, a washer or the like. It is for packing a rotary cutting blade for a brush cutter to which a blade body is detachably attached, and has a small width in three directions of an upper edge, a lower edge, and a left edge of a packaging board part slightly larger in diameter than the cutting blade body. The cut pieces are connected in an inwardly foldable manner so as to wrap the cutting blade body, and a side of the packaging board section is connected to a side of the packaging board section so as to be openable and closable. The cutting blade main body is provided on an inner surface of a packaging container in which an insertion piece protruding from the bent piece on the other side is detachably provided in an insertion hole provided on a side edge of the cover paper part. It is characterized in that the fitting portion to be fitted into the inner peripheral edge of the cushioning film body made of a synthetic resin flexible sheet adhered to all or a part of the periphery of the mounting hole is formed. Package of rotation cutting blade for brush cutter was. The cutting blade body is covered and covered with a large-diameter synthetic resin flexible sheet, and the remaining portion of the synthetic resin flexible sheet occupied by the cutting blade body is attached to a backing sheet. A portion surrounding the contour portion of the buffer film body which is completely or partially adhered around the mounting hole, and a perforated line or a cut line is provided from the outer edge portion of the synthetic resin flexible sheet to the contour portion. Wherein the cushioning film body surrounded by the portion remains around the mounting hole of the cutting blade body and is adhered through the perforation line or the cutting line, and the package of the rotary cutting blade for a brush cutter is characterized in that: .

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