JP2019201622A - Bush-cutting tip saw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide safety at the time of mowing work by integrally arranging a circular plate having an outer diameter capable of suppressing direct contact of a tip with the ground on the side of a base metal opposite to the surface of the bush cutter. To provide a tip saw for reaping that can sufficiently increase the SOLUTION: The anti-brusher mounting surface side of the base metal is on the outer peripheral side of a predetermined size of the mounting hole for the brush cutter, and the outer diameter thereof is smaller than the outer diameter of the base metal by a predetermined size and at least at the tip end side between the base metal and the base metal. It is characterized in that a circular plate body having a predetermined gap is integrally provided. The base metal has a mounting flat portion in which a mounting hole for a brush cutter is formed, a step portion formed on the outer peripheral side of the mounting flat portion so as to project toward the brush cutter side, and an outer peripheral side of the step portion. Is provided with a mounting flat portion and a cutting edge flat portion extending substantially parallel to the outer peripheral edge direction of the base metal, and the plate body is arranged at the outer peripheral end of the mounting flat portion substantially parallel to the cutting edge flat portion. To be done. [Selection diagram] Fig. 4

Description

  The present invention relates to a chip saw for mowing that is mounted on a brush cutter and used when mowing weeds and weeds (referred to as vegetation).

  Conventionally, a brush cutter tip saw is disclosed in, for example, Patent Document 1. In this tip saw, a mounting hole for a brush cutter is formed in the central portion of a disk-shaped base metal, and carbide chips are fixed to a large number of chip fixing portions formed on the outer peripheral edge of the base metal. Yes. Then, with the tip saw attached to the tip of the brush cutter's work rod (rotation transmission shaft), the tip saw rotates at a predetermined number of revolutions by operating the engine of the brush cutter, and the plants and the like are removed by the tip. (Cut).

JP 2011-254794 A

  However, in such a tip saw, at the outer peripheral edge of the rotating tip or the blade chamber of the base metal, etc. during the brush cutting operation, pebbles, sand, mud, cut vegetation, etc. on the ground were damaged. Chips etc. are likely to fly up (bounce off) and become scattered objects. In particular, when cutting the root part of grass or the like as much as possible, the chips directly come into contact with the ground and the scattered objects are likely to be generated, which is undesirable in terms of the safety of the cutting work and its improvement is desired. It is the actual situation.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an outer diameter circular plate body that can suppress direct contact of the chip with the ground surface, on the side of the anti-brusher mounting surface side of the base metal. It is an object of the present invention to provide a tip saw for brush cutting that can sufficiently enhance the safety during the brush cutting work.

  In order to achieve this object, the invention according to claim 1 of the present invention is such that a chip fixing portion is formed on the outer peripheral edge portion of the disk-shaped base metal, and the chip is fixed to the chip fixing portion. In the tip saw for brush cutting, the outer diameter is smaller than the outer diameter of the base metal by a predetermined dimension on the outer peripheral side of the mounting hole for the brush cutter on the anti-brusher mounting surface side of the base metal, and the base is at least on the tip side thereof. An outer circular plate having a predetermined gap with gold is integrally disposed.

  According to a second aspect of the present invention, the base is formed in a state in which the mounting flat portion in which the brush cutter mounting hole is formed and the outer peripheral side of the mounting flat portion protrude toward the brush cutter side. And a cutting edge flat portion extending substantially parallel to the mounting flat portion toward the outer peripheral edge of the base metal on the outer peripheral side of the step portion, and the outer peripheral side end of the mounting flat portion The plate body is disposed in a portion substantially parallel to the blade edge flat portion.

  The invention according to claim 3 is characterized in that the plate body is provided with a countermeasure for weight reduction by forming a material, a thickness, or a lightweight hole.

  According to the invention described in claim 1 of the present invention, the outer diameter of the base metal is larger than the outer diameter of the base metal on the outer side of the predetermined size of the mounting hole for the brush cutter on the anti-brusher mounting surface (back surface) side. Since the outer circular plate having a gap between the base metal and the base metal is arranged at least on the tip side with a predetermined dimension, the base metal on the ground side of the chip located on the outermost peripheral side of the base metal A small circular outer circular plate is located, and the plate contacts the ground earlier than the tip (base metal) during brush cutting, greatly increasing the amount of scattered material on the ground by the tip itself. Therefore, the safety of the mowing work can be sufficiently increased.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the base metal includes a mounting flat portion, a stepped portion, and a blade edge flat portion, and an outer peripheral side end portion of the mounting flat portion. Since the plate body is disposed substantially parallel to the blade edge flat portion, the plateau can cover the entire area of the base metal on the side facing the anti-brusher mounting surface while effectively utilizing the mounting flat portion at the center position. Further, the direct contact of the chip with the ground can be further suppressed, and the scattering of the scattered objects toward the operator can be reliably prevented.

  Further, according to the invention described in claim 3, in addition to the effects of the invention described in claim 1 or 2, the plate body is provided with measures for weight reduction by forming the material, the thickness, or the lightweight hole. Therefore, for example, by using a lightweight metal plate or hard resin plate with an appropriate thickness, or by providing a plurality of lightweight holes in the plate body, the plate body itself can be reduced in weight, and the increase in the weight of the tip saw can be suppressed as much as possible. It is possible to prevent the workability of the paying work from being lowered.

  The reverse view which shows one Embodiment of the chip saw for brush cutting concerning this invention   Arrow view along the AA line   (A) of the same plate is a plan view, and (b) is a view taken along the line BB in (a).   The figure which shows the attachment state to the same brush cutter

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 4 show an embodiment of a cutting saw tip saw according to the present invention. FIG. 1 shows a view of a cutting saw tip saw 1 (referred to as a tip saw 1) of the present invention as viewed from the back side, which is the anti-brusher mounting surface side. As shown in FIGS. 1 and 2, the tip saw 1 has a base metal 2 having a disk shape and a large number of lightweight holes 3, and a central portion of the base metal 2 is connected to a brush cutter 5 described later. A mounting hole 4 is formed.

  Further, the base metal 2 is formed with a mounting flat portion 2a having a predetermined width on the outer peripheral side of the mounting hole 4, and the outer peripheral side of the mounting flat portion 2a is increased toward the surface side of the base metal 2 (upward in FIG. 2). A stepped portion 2b having a height h1 and protruding in an inclined state is formed, and a blade edge flat portion 2c is formed on the outer peripheral side of the stepped portion 2b. At this time, the mounting flat portion 2a and the blade edge flat portion 2c are formed in parallel, so that the orientation direction (projecting direction outward) of the tip 6 as the blade edge and the mounting flat portion 2a are parallel (a plane in substantially the same direction). ).

  As a result, the base metal 2 is in a state in which a substantially dish-shaped depression 8 having a circular shape in a surface view is formed on the brush cutter mounting surface 7 side by the step 2b. Note that the inner diameter of the hollow portion 8 of the base metal 2 and the height dimension h1 of the stepped portion 2b are set to dimensions that do not hinder the attachment to the brush cutter 5 described later. A large number of blade chambers (galettes) 9 and chip fixing parts 10 (see FIG. 1) are formed at regular intervals at the tip of the blade edge flat part 2c, which is the outer peripheral edge of the base metal 2. The chip 6 made of cemented carbide is fixed by brazing.

  A plate 12 is disposed on the outer peripheral side of the mounting flat portion 2a of the base metal 2 (the anti-brusher mounting surface 7). As shown in FIG. 3, the plate body 12 is formed of, for example, a steel plate having a thickness of about 1 mm. The outer diameter φ2 shown in FIG. 2 is smaller than the outer diameter φ1 of the base metal by a predetermined dimension t = 5 mm to 20 mm, and An outer circular shape having a central hole 12a having an inner diameter φ4 larger than the inner diameter φ3 of the mounting hole 4 at a center position is formed.

  At this time, the inner edge portion of the center hole 12a abuts against the anti-brusher mounting surface (the back surface of the mounting flat portion 2a) on the outer peripheral side of the mounting flat portion 2a of the base metal 2, and the rivet hole 12b ( For example, 6 pieces are formed at equal intervals along the circumferential direction. The plate 12 is integrally fixedly disposed on the mounting flat portion 2a by the rivet 13 by using the rivet hole 12b and a rivet hole (not shown) provided in the mounting flat portion 2a.

  As a result, as shown in FIG. 2, the plate body 12 is disposed in parallel to the blade edge flat portion 2c via the space S formed by the gap corresponding to the height dimension h1 of the stepped portion 2b of the base metal 2. The plate body 12 is in a state of covering substantially the entire region excluding the tip 6 portion of the outer peripheral edge of the blade edge flat portion 2c of the base metal 2 from the lower side (the back side of the base metal 2) in FIG. The inner diameter φ4 of the center hole 12a of the plate body 12 is set slightly larger than the outer diameter of a receiving flange 5a of the brush cutter 5 described later, and the height dimension h1 is, for example, about h1 = 5 mm to 15 mm. The predetermined value is set according to the outer diameter of the base metal 2 or the like.

  The tip saw 1 configured as described above is manufactured by first processing a base metal material (raw material such as a carbon steel plate) by a press drawing process, and the mounting flat portion 2a having the mounting holes 4 and the stepped portion 2b. Then, the blade chamber 9, the tip fixing part 10, and the blade edge flat part 2 c having the lightweight hole 3 are formed. At the time of this drawing process, the radius on the cutting edge flat portion 2c side and the radius on the mounting flat portion 2a side of the hollow portion 8 (stepped portion 2b) are set in accordance with the outer diameter of the mounting flat portion 2a and the inner diameter of the hollow portion 8. By setting, cracks and the like of the dent portion 8 are prevented, and shake and tilt at the time of rotation of the base metal 2 are suppressed.

  After the base metal material is processed to produce the base metal 2, the base metal 2 is hardened and annealed using, for example, high-frequency induction heating. During this heat treatment, the base metal 2 is heated and pressed to prevent warping of the mounting flat portion 2a and the blade edge flat portion 2c, and the mounting flat portion 2a and the blade edge flat portion 2c parallel to each other are formed. . After the heat treatment of the base metal 2 is finished, the surface treatment of the base metal 2 is performed by, for example, shot blasting, or the chip 6 is fixed to each chip fixing portion 10 of the base metal 2 by brazing using, for example, high frequency induction heating. To do.

  Thereafter, each surface of the chip 6 is polished and finished to produce the base metal 2, and the plate body 12 prepared in advance on the rear peripheral edge of the mounting flat portion 2 a of the base metal 2. Is fixed with a rivet 13 to manufacture the tip saw 1 in which the plate 12 is firmly integrated with the base metal 2.

  As shown in FIG. 4, the tip saw 1 configured as described above includes a holding flange 5 b, a mounting bolt 14, a bolt protection cover 15, and the like on a receiving flange 5 a at the tip of a work rod 5 c as a rotation transmission shaft of the brush cutter 5. Attached through. At the time of this mounting, the lower surface of the receiving flange 5a is brought into contact with the surface of the mounting flat portion 2a of the tip saw 1 (the brush cutter mounting surface 7), whereby the receiving flange 5a and the tip of the working rod 5c are inserted into the recess 8 of the tip saw 1. Etc. are in a state of being accommodated and arranged. At the same time, the mounting bolt 14 whose head is located on the back side of the plate 12 is in a state in which the head is protected by the bolt protection cover 15.

  As described above, since the outer diameter of the mounting flat portion 2a of the tip saw 1 and the inner diameter of the center hole 12a of the plate 12 are set larger than the outer diameter of the receiving flange 5a of the brush cutter 5, The brush cutter mounting surface 7 of the flat portion 2a is in close contact with the entire flange surface of the receiving flange 5a. When the brush cutter 5 is operated in this attached state, the tip saw 1 rotates in the direction of arrow A in FIG. 1, and the plant or the like is cut while the tip 6 at the tip of the blade edge flat portion 2c rotates in the same direction.

  Further, since the plate 12 also rotates together with the base metal 2 during the cutting operation, the tip 6 of the plate 12 is in contact with the ground, and the chip 6 positioned on the outer side and above the plate 12 is used. The vegetation and the like are cut off, and direct contact of the chip 6 with the ground is prevented. As a result, the chip 6 hardly scatters scattered objects such as pebbles, sand, and mud on the ground, and even if the scattered objects are splashed at the tip of the plate 12 that contacts the ground, The scattered matter is bounced back toward the ground on the back surface of the base metal 2, and the scattering toward the front surface side of the base metal 2, that is, toward the worker is surely suppressed.

  As described above, according to the tip saw 1, the outer diameter φ <b> 2 is larger than the outer diameter φ <b> 1 of the base metal 2 on the outer side of the predetermined dimension of the mounting hole 4 on the anti-brusher mounting surface side that is the back side of the base metal 2. Since the substantially annular plate body 12 having a small dimension t and having a gap-like space S between the surface of the base metal 2 is integrally disposed, the chip located on the outermost peripheral side of the base metal 2 6, a plate 12 having a circular outer diameter smaller than the base metal 2 is positioned on the ground side, and the plate 12 comes into contact with the ground prior to the chip 6 (base metal 2) during the brushing operation. Can greatly suppress the scattering of the scattered objects on the ground, and can sufficiently increase the safety of the mowing work.

  In particular, by setting the outer diameter φ1 of the base metal 2 and the outer diameter φ2 of the anti-scattering plate 12 to a predetermined value, the cutting height of plants and the like is slightly increased according to the height dimension h1, but the cutting by the chip 6 A good cutting performance can be obtained without degrading the performance, and an unprecedented highly safe tip saw that can reliably suppress scattering of scattered objects, for example, toward the operator. Further, since the contact of the tip 6 with the ground during the cutting operation is suppressed, the tip 6 itself can be prevented from being damaged and the life of the tip saw 1 can be extended as compared with the conventional tip saw.

  Further, since the plate 12 and the blade edge flat portion 2c of the base metal 2 are arranged to face each other in parallel and a space S having a height dimension h1 is formed between them, the chopped vegetation that has entered the space S, etc. Can be discharged out of the space S by the centrifugal force when the tip saw 1 rotates, and the scattered matter remaining in the space S after the tip saw 1 is stopped can be easily removed.

  Further, since the cutting edge flat portion 2c of the base metal 2 that affects the cutting performance is set in parallel with the mounting flat portion 2a, the tip 6 as the cutting edge and the mounting flat portion 2a have an angle, and the tip 6 becomes a plant or the like. For example, the chip 6 can be inserted into a plant or the like at a substantially right angle so that a good sharpness can be easily ensured in the chip saw 1.

  Furthermore, since the tip end portion of the working rod 5c of the brush cutter 5 is accommodated in the hollow portion 8 of the base metal 2, the tip 6 will not be unnecessarily separated (distant) from the brush cutter operator. The chip 6 can be reliably brought into contact with a predetermined position on the base side of a plant or the like while the plate body 12 is in contact with the ground, and the brushing operation can be performed smoothly.

  In the above-described embodiment, the form in which the plate body 12 is formed of a circular steel plate has been described. However, in the present invention, the weight of the plate body 12 is added to the weight of the base metal 2 as it is and the tip saw 1 itself Since the weight increases, it is preferable to take various measures to reduce the weight of the plate body 12. As measures for reducing the weight, a lightweight plate such as light aluminum or stainless steel or a plate made of hard resin can be used instead of the steel plate, or the plate thickness of these various plates can be reduced as much as possible. be able to. Further, it is possible to cope with this by forming a suitably shaped lightweight hole in the plate body 12. In this case, it is preferable to provide a relatively large lightweight hole on the inner peripheral side of the plate body as far as possible (side farther from the chip 6). .

  Moreover, in the said embodiment, although the plate | board body 12 was made into flat form and the front-end | tip part was set in parallel with the blade edge | tip flat part 2c of the base metal 2, for example, the part facing the blade edge | blade flat part of the plate body 12 is made downward, for example By forming the curved surface in a convex shape, the convex portion of the plate 12 can be brought into contact with the ground during the brushing operation, and the operation itself may be performed smoothly. Furthermore, in the said embodiment, although the plate body 12 was integrally fixed to the base metal 2, you may arrange | position the plate body 12 integrally in the outer periphery of the bolt protective cover 15, for example, The body 12 can be removed from the base metal 2 by removing the bolt protection cover 15.

  Further, in the embodiment, the gap dimension between the flat edge 2c of the base metal 2 and the plate body 12 (height dimension h1 of the stepped portion 2b), the dimensional relationship between the base metal 2 and the plate body 12, the fixing structure thereof, and the like are examples. Thus, for example, an appropriate configuration can be employed without departing from the gist of the present invention, such as using welding as the fixing structure.

  The present invention is not limited to a tip saw in which the base has an attachment flat portion, a blade edge flat portion, and the like, and can be used for all cutting saws that have various forms of base metal and are used to cut grass and the like. .

  DESCRIPTION OF SYMBOLS 1 ... Brush saw tip saw, 2 ... Base metal, 2a ... Mounting flat part, 2b ... Step part, 2c ... Blade edge flat part, 4 ... Mounting hole, 5 ... Brush cutter, 6 ... chip, 7 ... Mower mounting surface, 8 ... recessed portion, 9 ... blade chamber, 10 ... tip fixing portion, 12 ... plate body, 12a ... -Center hole, 12b ... Rivet hole, 13 ... Rivet, 14 ... Mounting bolt, 15 ... Bolt protection cover, h1 ... Height dimension of step, φ1 ... Base metal Outer diameter, φ2: outer diameter of plate, S: space.

Claims (3)

In the chip saw for brush cutting in which the chip fixing part is formed on the outer peripheral edge of the disk-shaped base metal and the chip is fixed to the chip fixing part,
The outer diameter is smaller than the outer diameter of the base metal by a predetermined dimension on the outer peripheral side of the mounting hole for the brush cutter on the anti-brusher mounting surface side of the base metal, and is predetermined between the base metal at least at the tip side thereof. A chip saw for brush cutting, in which circular plates having an outer shape having a gap are integrally disposed.   The base metal includes a mounting flat portion in which the brush cutter mounting hole is formed, a stepped portion formed in a state of protruding toward the brush cutter on an outer peripheral side of the mounting flat portion, and an outer periphery of the stepped portion. And a cutting edge flat part extending substantially parallel to the mounting flat part toward the outer peripheral edge of the base metal, and the plate body and the cutting edge flat part at an outer peripheral side end of the mounting flat part. The chip saw for mowing according to claim 1, wherein the chip saw is disposed substantially in parallel.   The chip saw for brush cutting according to claim 1 or 2, wherein the plate body is provided with a countermeasure for weight reduction by forming a material, a thickness, or a lightweight hole.

Images