JP3845847B2 - Mowing tip saw - Google Patents

Description

  The present invention relates to a cutting saw for mowing used when cutting a plant (referred to as a plant) such as weeds, weeds, and small bamboos.

Conventionally, this type of tip saw is disclosed in, for example, Patent Document 1. As shown in FIG. 7, the chip saw 101 has chip mounting recesses 104 and tooth chambers 105 (gallets) formed at predetermined intervals on the outer peripheral edge portion 103 of a disk-shaped base metal 102. The chip 106 is fixed to each other.
Japanese Utility Model Publication No. 6-72319

  However, in such a tip saw 101, although the vegetation directly hitting the rake face 106a of the tip 106 can be cut smoothly by the rotation, the tooth chamber 105 is formed in a hollow shape deeper than the deepest position of the tip mounting recess 104. For this reason, there is a case where the cutting is not smoothly performed due to the vegetation being caught and entangled in the dental chamber 105 where no blade is provided. As a result, the tip saw is inferior in sharpness and is often used by setting the engine speed of the brush cutter to a high speed, which places an unreasonable load on the engine and may cause the tip 106 itself to be heavily loaded and missing. For example, there is a problem that the life of the chip saw 101 is likely to be reduced.

  The present invention has been made in view of such circumstances, and its purpose is to prevent tangling of vegetation and the like and to improve sharpness, to reduce the load on the engine of the brush cutter and to improve the life of the tip saw itself. An object of the present invention is to provide a mowing tip saw that can be made to operate.

In order to achieve such an object, the invention described in claim 1 of the present invention includes a disc-shaped base metal having a mounting hole for a brush cutter at a central position, and an outer peripheral edge portion of the base metal. In a mowing tip saw having a large number of tip attaching portions formed at predetermined intervals and tips fixed to the tip attaching portions, the outer peripheral edge between adjacent tip attaching portions of the base metal is each tip attaching portion. The outer peripheral edge is honed, and between the chip mounting portions of the honed portion, in the thickness direction of the base metal. A strain absorbing means including a recessed portion is provided .

Further, as in the invention described in claim 2, the outer peripheral edge is preferably formed in a state located on the inner side of the extension line of the flank of the chip and in a substantially continuous state on the flank. .

  According to the invention described in claim 1 of the present invention, since the outer peripheral edge between the chip mounting portions formed on the outer peripheral edge portion of the base metal is set not to be deeper than the deepest position of the chip mounting portion, A dented tooth space is no longer formed between the tip mounting parts, tangling of plants is prevented and a tip saw with excellent sharpness is obtained, and it is not necessary to set the engine of the brush cutter at high rotation, The load on the engine can be reduced, and the load on the chip is also reduced, so that it is possible to easily obtain a tip saw having a long life.

In addition, since the outer peripheral edge between the chip mounting parts is formed in a straight line or a gentle curved shape, it is possible to smoothly guide the vegetation to the rake face of the chip at the outer peripheral edge part, and it is easy to make a chip saw with even better sharpness. In addition, it is possible to obtain an outer peripheral edge in which a hollow tooth chamber is not formed, and the base metal structure can be simplified and formed at low cost. Further, discoloration of the outer peripheral edge due to heating during chip brazing can be removed (processed) by an environmentally-friendly and effective honing process, and a chip saw with excellent appearance quality can be easily obtained. In addition, since a strain absorbing means comprising a concave portion for absorbing the distortion of the base metal is provided in the annular portion of the outer peripheral edge of the base metal, the strain absorbing means has the function of a conventional hollow tooth chamber. Further, distortion and deformation due to heating of the outer peripheral edge portion of the base metal during chip brazing are prevented, blurring of the outer peripheral edge portion during rotation of the base metal is suppressed, and a chip saw with even better sharpness can be obtained.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the outer peripheral edge between the tip mounting portions is in a state where the outer peripheral edge is located on the inner side of the extension line of the tip flank. Since the surface is formed in a substantially continuous state, the vegetation can be smoothly guided to the rake face of the chip at the outer peripheral edge portion, and a chip saw with even better sharpness can be easily obtained.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
1 to 3 show an embodiment of a mowing tip saw according to the present invention, FIG. 1 is a plan view thereof, FIG. 2 is an enlarged view of the main portion thereof, and FIG. 3 is a sectional view of the main portion thereof.

  In FIG. 1, a tip saw 1 has a disk-shaped base 2, and a mounting hole 3 having a predetermined inner diameter for mounting to a brush cutter (not shown) is formed at the center of the base 2. Many chips 5 are fixed to the outer peripheral edge 4 of the base metal 2. As shown in FIG. 2, the tip 5 is formed in a substantially prismatic shape so as to have a rake face 5 a and a flank face 5 b by using a hard metal or the like, and two fixed portions excluding the rake face 5 a and the flank face 5 b of the tip 5. The surface is fixed to each surface of the stepped chip mounting portion 6 composed of the vertical surface 6a and the horizontal surface 6b formed on the outer peripheral edge portion 4 of the base metal 2 by brazing using, for example, induction heating in a contact state. ing.

  The outer peripheral edge 7 of the base metal 2 between the chip mounting portions 6 is formed to be substantially linear. That is, the outer peripheral edge 7 between the chip mounting portions 6 positioned before and after the rotation direction A is directed from the front end portion of the vertical surface 6a of the front chip mounting portion 6 to the front end portion of the horizontal surface 6b of the rear chip mounting portion 6. It extends in a straight line. As a result, the outer peripheral edge 7 between the chip mounting portions 6 does not become deeper than the tip of the horizontal surface 6b which is the deepest position of each chip mounting portion 6, and the outer peripheral edge 7 is an extension of the flank 5b of the chip 5. There is no portion corresponding to the denture 105 having a recessed shape as in the prior art, located inside the line 9 and between the tip mounting portions 6.

  As shown by the solid line in FIG. 2, the outer peripheral edge 7 between the chip mounting portions 6 is the front end portion of the vertical surface 6 a of the front chip mounting portion 6 and the front end portion of the horizontal surface 6 b of the rear chip mounting portion 6. For example, as shown by a two-dot chain line in FIG. 2, the shape of the chip 5 and the chip are fixed so that the chip 5 is fixed with a predetermined step 8 with respect to each tip portion. The shape of the attachment portion 6 can also be set.

  As shown in FIGS. 1 and 2, the outer peripheral edge 4 of the base metal is provided with a honing processing unit 10, and a recess 11 as a strain absorbing means is provided in the honing processing unit 10. The honing processing unit 10 rotates the outer peripheral edge 4 of the base metal 2 discolored by heat when the chip 5 is brazed to the chip mounting part 6 with a rotating brush (not shown). 1) and the base metal 2 and polished with a rotating brush to form an annular shape. The honing processing unit 10 ensures a good appearance on the outer peripheral edge 4 of the base metal 2.

  As shown in FIG. 3, the concave portion 11 as the strain absorbing means is predetermined on the both sides of the base metal 2 in the plate thickness direction by pressing the outer peripheral edge 4 of the base metal 2 with an appropriate jig or mold. It has a shape recessed in a circular shape with a depth h, and is formed at a substantially central position between the chip mounting portions 6 inside the outer peripheral edge 7 between the chip mounting portions 6. Thereby, the recessed part 11 is formed in the annular position of the outer peripheral edge part 4 of the base metal 2 at a constant interval, and the outer peripheral edge part 4 of the base metal 2 is put in the recessed part 11, so that each chip attaching part 6. In addition, distortion or the like of the base metal 2 when the chip 5 is brazed using high-frequency induction heating is absorbed (suppressed).

The strain absorbing means is not limited to the circular recess 11 but may be a recess 12 as indicated by a solid line or a two-dot chain line in FIG. The recesses 11 and 12 are preferably formed in the same shape at the same position on both surfaces of the base metal 2, but the same shape or different shapes depending on the plate thickness of the base metal 2 and the shape of the chip mounting portion 6. The concave portions 11 and 12 may be provided at different positions on both sides, or the concave portions 11 and 12 may be alternately provided on both sides along an annular shape, and strain absorbing means having an appropriate shape and arrangement can be employed. .

  Further, the outer peripheral edge 7 between the chip mounting portions 6 is not limited to a straight line shape, for example, as shown by a solid curve in FIG. Alternatively, it may be formed in a gently curved shape recessed inward. In the case of this curved shape, the curvature is preferably set to be substantially the same as the curvature of the outer peripheral edge 4 of the base metal 2.

  Further, the shape of the chip mounting portion 6 is not limited to a stepped shape having the vertical surface 6a and the horizontal surface 6b. For example, as shown in FIG. 6, a concave groove shape having the front and rear vertical surfaces 6a and the horizontal surface 6b as the bottom surface. In this case as well, the outer peripheral edge 7 between the chip mounting portions 6 is set to be linear or curved so as not to be deeper than the horizontal surface 6 b of the chip mounting portion 6. In this case, the shape of the chip 5 is also set according to the shape of the chip mounting portion 6, and the shape of the chip mounting portion 6 and the chip 5 is appropriately set according to the use of the chip saw 1 and the outer shape. Can do.

  According to this tip saw 1, when the mounting hole 3 is attached to the rotary shaft of the brush cutter and the engine is operated, it rotates at a predetermined rotational speed in the direction of the arrow A in FIGS. The vegetation is cut off by the tip 5 fixed to the peripheral edge 4. At the time of trimming the vegetation, the vegetation is guided along the outer peripheral edge 7 between the front and rear tip attachment portions 6 of the base metal 2 on which the vegetation is rotating, and is cut in contact with the rake face 5a of the rear tip 5. When the vegetation is guided by the outer peripheral edge 7, since the hollow tooth chamber 105 does not exist in the outer peripheral edge 7, the vegetation is not entangled with the outer peripheral edge 7 between the tip mounting portions 6, and the vegetation is cut smoothly. Will be.

  Thus, in the tip saw 1 of the above embodiment, the outer peripheral edge 7 between the chip attaching portions 6 formed on the outer peripheral edge portion 4 of the base metal 2 is not deeper than the deepest position of each chip attaching portion 6. Since it is set in a straight line shape or a gently curved shape, the conventional dented tooth chamber 105 is not formed between the chip mounting portions 6, and the base metal 2 between the chip mounting portions 6 is connected to the base metal 2. The entanglement of the vegetation is prevented, and the vegetation guided well at each outer peripheral edge 7 is smoothly brought into contact with the rake face 5a of each tip 5 and cut, so that the tip saw 1 having excellent sharpness can be obtained.

  As a result, it is not necessary to set the rotation of the brush cutter engine to a high rotation, so that the load on the engine can be reduced and cutting noise can be reduced and vibration of the handle portion of the brush cutter can be reduced. In addition, the load on the chip 5 is also reduced, the chip 5 itself is prevented from being chipped, and the chip saw 1 having a long life can be easily obtained. At the same time, the tip saw 1 having excellent sharpness can reduce the burden on the operator and can sufficiently increase the safety of the mowing operation itself.

  Further, since the outer peripheral edge 7 between the chip mounting portions 6 is formed in a straight line or a gently curved shape, it is necessary to form a tooth chamber 105 that is greatly depressed in the outer peripheral edge 7 of the base metal 2 as in the prior art. The shape of the base metal 2 itself is simplified, the shape of the press die for producing the base metal is simplified, the manufacturing cost of the base metal 2 itself is reduced, and the cost is low and the lifetime is long. The tip saw 1 can be provided.

  In addition, since the strain absorbing means including the concave portion 11 and the concave groove 12 for absorbing the distortion of the base metal 2 is provided in the annular portion of the outer peripheral edge portion 4 of the base metal 2, the strain absorbing means has a conventional depression shape. The function of the tooth chamber 105 can be provided, and distortion and deformation due to heating of the outer peripheral edge 4 of the base metal 2 during chip brazing can be prevented, and the outer peripheral edge 4 of the base metal 2 during rotation of the base metal 2 can be prevented. Blurring and the like are suppressed, and it is possible to obtain a tip saw 1 with even better sharpness. In particular, since the strain absorbing means is formed by the concave portion 11 and the concave groove 12, it can be easily formed on the base metal 2 by, for example, pressing, and the structure of the base metal 2 itself can be further simplified to provide an inexpensive tip saw 1. Obtainable.

  Further, since a honing treatment unit 10 that is honed using a liquid having dustproof oil and grinding powder is provided on the outer peripheral edge 4 of the base metal 2, discoloration of the outer peripheral edge 4 due to heating during chip brazing. Can be removed (processed) by an effective honing process that can recycle the liquid in an environmentally friendly manner, and an inexpensive tip saw 1 that is superior in sharpness and appearance quality that is not conventionally obtained can be obtained. It becomes possible.

  In the above embodiment, all the outer peripheral edges 7 between the chip mounting portions 6 provided at predetermined intervals on the outer peripheral edge portion 4 of the base metal 2 are formed in the same shape that does not become deeper than the horizontal surface 6b of the chip mounting portion 6. However, the present invention is not limited to this. For example, a configuration in which the linear outer peripheral edge 7 and the conventional outer peripheral edge having the tooth chamber 105 are provided alternately or every predetermined number can be adopted. A configuration in which different outer peripheral edges 7 are combined, such as an outer peripheral edge 7 having a curved shape and an outer peripheral edge 7 having a gently curved shape, can also be employed. In addition, the form of the base metal 2 in the above embodiment is an example, and an appropriate hole is provided in a predetermined annular portion on the outer periphery of the mounting hole 3 of the base metal 2 for the purpose of preventing warpage of the base metal 2 or reducing the weight. An opening or the like can also be provided.

  The present invention can be applied to various types of chip saws other than those shown in the above example in which the chip is fixed to the chip mounting portion of the base metal.

  Plan view of a cutting saw according to the present invention   Enlarged view of the main part   Sectional view of the main part   An enlarged view similar to FIG. 2 showing a modification of the strain absorbing means   Enlarged view similar to FIG. 2 showing a modification of the outer periphery   Enlarged view similar to FIG. 2 showing another modified example   Enlarged view of the main parts of a conventional mowing tip saw

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tip saw, 2 ... Base metal, 3 ... Mounting hole, 4 ... Outer peripheral edge part, 5 ... Tip, 5a ... Rake face, 5b ... Relief face, 6. ..Chip mounting portion, 6a... Vertical surface, 6b .horizontal plane, 7 ..outer peripheral edge, 8 ..step, 9 .extension line, 10. -Concave part, 12 ... concave groove.

Claims (2)

A disc-shaped base metal having a mounting hole for a brush cutter at the center, a large number of chip mounting parts formed at predetermined intervals on the outer peripheral edge of the base metal, and fixed to the chip mounting part. A mowing tip saw comprising:
The outer peripheral edge between adjacent chip mounting parts of the base metal is formed in a continuous line shape of a straight line or a gentle curve that is not deeper than the deepest position of each chip mounting part, and the outer peripheral edge part is honed, and A chip saw for mowing, characterized in that a strain absorbing means comprising a recess recessed in the thickness direction of the base metal is provided between each chip mounting portion of the honing processing portion . 2. The tip saw for mowing according to claim 1, wherein the outer peripheral edge is formed in a state of being located on an inner side of an extended line of the flank of the tip and being substantially continuous with the flank .

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