JP3095470U - Saw blade - Google Patents

Abstract

(57) [Problem] To provide a mowing saw blade in which grass, vine, and the like are not caught in a minute gap between a saw blade main body upper surface and a shaft support. SOLUTION: A plurality of tongue-shaped upper surface projections 3 are provided at equal intervals in the circumferential direction on the upper surface at a position in the radial direction of the saw blade main body 2, and each upper surface projection is inclined obliquely upward toward the outside in the radial direction. It is characterized in that it has a portion 6 which protrudes and whose protruding edge of the upper surface projection gradually rises rearward in the saw blade rotation direction and faces radially outward. The protruding edge of the upper surface projection acts to guide the contacted grass and the like upward and to push it outward.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention relates to a mowing saw blade attached to a mowing machine used for mowing and the like. To do.

[0002]

[Prior art]

  Conventional saw blades of this type generally have a saw blade on the outer circumference of a disk-shaped body and It is only provided with a shaft hole. Depending on the case, the outer peripheral saw blade part and the central shaft hole There are also various types of through-holes provided between and for design purposes and weight reduction. Separately, as seen in Patent Document 1, a protrusion with a blade is provided on the upper surface of the saw blade body in a protruding manner. However, there is no description about the action of the protrusions.

[0003]

[Patent Document 1]           Registered Design No. 932084

[0004]

[Problems to be solved by the device]

  In any case, conventional saw blades for brush cutting are used to rotate the saw blade while using it. Non-rotating support (holder part) that supports the upper surface of the body and the mounting axis of the saw blade. ) There is a minute gap between the bottom surface and grass, vines, etc. wrapped around the minute gap. If you continue to use it, the winding amount will increase and the rotation of the saw blade will stop. There was a problem That is, with a conventional ordinary cutting blade, for example, a mowing operation On the saw blade main body, while long things such as grass and vines are not cut down and continue to the root, If it is located along the surface, there is a chance that it will enter the minute gap and it may enter. It Then, grass and vines are pulled toward the root, Must be stopped, and the rotation of the saw blade must be stopped to remove grass and vines caught in the minute gap. I have to. In some cases, the saw blade must be removed from the rotary shaft before it can be removed. There is also a thing. Therefore, it takes a lot of time and effort to remove the caught matter. Therefore, the work is significantly interrupted and the work efficiency is significantly reduced. In addition, the above For craftsmen, the front edge of the protrusion in the direction of rotation must be perpendicular to the direction of rotation. Due to the blade on the saw and the low height of the protrusions, long grass etc. The part that cannot be cut by the blade when it comes into contact with the surface from the upper side wraps around the base of the protrusion There is a risk that the wound objects may get caught in the minute gaps. It cannot be expected to prevent gap entrapment.   In the present invention, grass or vines are caught in a small gap between the upper surface of the saw blade body and the shaft support. It is an object to provide a saw blade for brush cutting.

[0005]

[Means for Solving the Problems]

  The cutting blade of the present invention has a plurality of tongue-shaped upper blades on the upper surface of the saw blade main body in the radial direction. The surface projections are provided at equal intervals in the circumferential direction, and each upper surface projection faces upward in the radial direction. Projecting diagonally, and the projecting edge of the top surface projection is gradually rearward in the saw blade rotation direction. Characterized in that it has a portion that rises to the outside and faces outward in the radial direction. .

[0006]   This mowing saw blade has a rotary shaft at the tip of the operating rod of a mowing machine, similar to a normal mowing saw blade. Attach and use. In use, the upper surface protrusion is located on the upper surface. When the saw blade rotates, the protrusion on the top also rotates, so that the inside of the saw blade along the upper surface of the saw blade during the mowing operation. The top protrusions dispel the incoming grass stems, leaves, and vines toward the outer circumference of the saw blade. sand That is, the edge of the top protrusion gradually rises from the front side to the rear side in the rotation direction and widens outward. Since it has a sloping shape, it rotates at high speed, but the edge of the top surface protrusion hardly cuts. , It acts so as to guide the contacted grass and the like upward and push it outward. Out of this The action of pushing it to the side is effective from the top surface of the saw blade body to the height position of the top surface protrusion. Yes, rotatably supports the saw blade mounting shaft and rotates with the non-rotating support Surely prevent grass etc. from getting caught in the minute gap between the upper surface of the saw blade To do. In addition, the action of guiding grass etc. to the upper side comes in contact with the next upper surface protrusion behind the rotation direction. Since it will be difficult to guide, it is not possible to rotate it by contacting the top projection with grass etc. Reduce rolling resistance.

[0007]   Separately, the cutting blade of the present invention is provided with a radial blade at an intermediate position in the radial direction of the saw blade body. A plurality of outwardly extending tongues are provided at equal intervals in the circumferential direction, and each tongue is bent at the base of the tongue. Bending along the line to the upper surface side of the main body to form an upper surface protrusion, and the bending line is It is substantially perpendicular to the radial line of the saw blade body that passes through the edge of the tongue base on the tip side in the saw blade rotation direction. It is characterized by

[0008]   This mowing saw blade has a rotary shaft at the tip of the operating rod of a mowing machine, similar to a normal mowing saw blade. Attach and use. In use, the upper surface protrusion is located on the upper surface. When the saw blade rotates, the top protrusion also rotates, so that it will fit inside the saw blade during the mowing operation. So that the top surface projections can dispel grass stems, leaves, vines, etc. coming into the side toward the outer circumference of the saw blade. Extrude into. That is, the bending line of the tongue that forms the top protrusion is the saw blade rotation of the tongue base. Since it is almost perpendicular to the radius line of the saw blade body that passes through the edge on the tip side in the rolling direction, It is open toward the outside and goes inside along the upper surface of the saw blade when cutting the grass. The stalks, leaves, vines, etc. of the coming grass are wiped away by the edges of the top protrusions contacting the outer surface. To extrude. The action of pushing it out like this It is effective from the surface to the height of the top protrusion, and supports the saw blade mounting shaft so that it can rotate. There is a small gap between the rotating non-supporting part and the upper surface of the rotating saw blade body. Make sure to prevent grass from getting caught.

[0009]   The tip edge of the tongue before bending and bending straightens outward toward the rear in the rotation direction of the saw blade body. It is preferable to have a linear portion. In this configuration, the tip edge of the bent tongue is The linear part is raised rearward in the direction of rotation and opened outward, When cutting, brush away grass stems, leaves, and vines that come in along the upper surface of the saw blade. In addition to pushing out, the action of guiding upward is added. Work to guide upwards For use, reduce the rotational resistance due to the contact of the top surface protrusions with grass.

[0010]   The tongue has a through hole formed in the saw blade body to form an outer edge of the tongue. It is preferable that it is formed by In this configuration, the tongue is originally the saw blade body. Since it is formed by the parts that are It can be realized at low cost because it does not cost much even if the upper surface protrusion is provided. .

[0011]   The bending angle of each of the upper surface protrusions is in the range of 30 ° to 60 °. It is good to With this configuration, if the bending and raising angle is too small, The effective height becomes low, and the effect of preventing wrapping around minute gaps cannot be sufficiently obtained, A balun that pushes outward and guides upward when the angle is close to 90 °. In practice, it is appropriate to select within the range of 30 ° to 60 ° because It

[0012]

[Embodiment of device]

  An embodiment of the present invention will be described with reference to FIGS. This mowing saw blade 1 The saw blade body 2 has an upper surface protrusion 3 on the upper surface. The upper surface protrusion 3 is For example, five pieces are provided at equal intervals.

[0013]   Each of the upper surface projections 3 is formed in a tongue shape, and as shown in FIG. At a position midway in the radial direction of the main body 2, from the saw blade main body upper surface 4 in the radial direction above the saw blade main body 2. The upper edge of the upper surface projection 3 is obliquely projected toward the saw blade rotation direction (see FIG. (Direction of arrow 5 in (a)) Gradually rising rearward and outward in the radial direction It has a facing part 6.

[0014]   For example, as shown in FIG. 3, the method for forming the upper surface protrusions 3 is a predetermined method for the saw blade body 2. A curved through hole 9 having a curved shape that forms the outer edge 8 of the tongue piece 7 is formed at the radial position. Bend and bend at a predetermined angle θ (about 45 °) to the upper surface side along a predetermined bending line 11 at the base of To form. The bending line 11 is, as shown in FIG. 1 (a), the rotation direction of the saw blade at the base of the tongue piece 7. It is perpendicular to the radial line 12 of the saw blade body 2 passing through the edge on the front end side. And the tip of the tongue 7 The edge is formed in advance so as to form an angle α (30 °) with the bending line 11. This makes the song The back side of the barb wire 11 in the saw blade rotation direction is opened more outward in the radial direction than the tip side. The protruding edge of the upper surface projection 3 that bends and raises the piece gradually rises rearward in the saw blade rotation direction. And has a portion 6 facing outward in the radial direction.   In FIG. 1, 13 is a saw blade tip made of cemented carbide, and 14 is a saw blade. Is a shaft hole for mounting to the brush cutter.

[0015]   This saw blade 1 for brush cutting is attached to the tip of the main rod of the brush cutter, like the conventional one. To use. FIG. 2 shows a mounting portion (holder) for attaching the cutting blade 1 to the tip of the main rod 15. 16 shows a state of being attached, 17 is a rotating shaft, 18 is a presser foot, and 19 is a mounting screw. is there. The mounting portion 16 is a portion that does not rotate, and the above-mentioned fine portion is provided between the mounting portion 16 and the rotating saw blade body 2. There is a small gap 17. This mowing saw blade 1 extends over the upper surface 4 of the saw blade body 2 during use. When weeds or vines come into contact with the saw blade main body upper surface 4 when it comes into contact with the outside of the upper surface protrusions 3. If the upper projection 3 is obstructed, the upper projection 3 can be moved within the height range of the upper projection 3. It does not go inside the radial position. In addition, straddling the inside and outside of the top surface protrusion 3 When it comes into contact with the upper surface 4 of the saw blade body, one of the upper surface protrusions 3 is rotated at the next moment by rotation. Abutting, and by its edge part, there are a push-out action outward and a guide action upward. Can be moved. Therefore, long grass or the like is caught in the minute gap 20. There is no. Because of this, long grasses, vines, etc. are caught in the minute gaps 20, Since there is no interruption in the work, the bush cutting work can be performed efficiently.

[0016]   In the above-described embodiment, the upper surface protrusion 3 is formed by providing the saw blade body with the irregular through hole. Was formed by bending the tongue and bending it, but in some cases it was formed separately. The tongue may be attached.

[0017]

[Effect of device]

  The invention as set forth in claim 1, wherein the saw blade mounting shaft portion is rotatably supported. Grass is caught in the minute gap between the unsupported part and the upper surface of the rotating saw blade body. Since it is surely prevented from being cut, it is possible to efficiently perform the bush cutting work, and the rotation resistance Since it can be reduced, the operability is improved.   According to a second aspect of the present invention, the saw blade mounting shaft portion is rotatably supported and is rotated. Grass is caught in the minute gap between the unsupported part and the upper surface of the rotating saw blade body. Since it is surely prevented from being cut, there is an effect that the mowing work can be performed efficiently. To do.   The invention according to claim 3 comes inward along the upper surface of the saw blade when cutting grass. In addition to extruding grass stems, leaves, and vines, it also guides them upward. Since the work is added, the rotation resistance is reduced and the operability is improved.   The inventions according to claims 4 and 5 have an effect that can be realized at low cost. .

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, (a) is a plan view,
(B) is a cross-sectional view taken along the line AA of (a), and (c) is a line B- of (a).
It is a B sectional view.

FIG. 2 is a side view showing a state in which the saw blade of the same embodiment is mounted in a used state.

FIG. 3 is a partially enlarged plan view showing the shape of the tongue piece serving as the upper surface protrusion of the embodiment before bending and raising.

[Explanation of symbols]

1 Saw blade for brush cutting 2 saw blade body 3 Top surface protrusion 4 Upper surface of main body 5 arrows (direction of rotation) 6 pieces 7 tongue 8 outer edges 9 Deformed through-hole 11 Bending line 12 radius line 13 chips 14 Shaft hole for mounting 15 main rod 16 Mounting part (holder) 17 rotation axis 18 Presser foot 19 Mounting screw 20 Micro gap

Claims (5)

[Scope of utility model registration request] 1. A plurality of tongue-shaped upper surface projections are provided at equal intervals in the circumferential direction on the upper surface of the saw blade main body at an intermediate position in the radial direction, and each upper surface projection protrudes obliquely upward in the radial outer direction. And a protruding blade edge of the upper surface projection has a portion that gradually rises rearward in the saw blade rotation direction and that faces outward in the radial direction. 2. A plurality of tongues extending substantially outward in the radial direction are provided at an intermediate position in the radial direction of the saw blade body at equal intervals in the circumferential direction, and each of the tongues is provided on the upper surface of the main body along the bending line of the tongue base. The cutting line is formed by bending to a side to form an upper surface projection, and the bending line is substantially perpendicular to a radial line of a saw blade body passing through an edge of the tongue base portion on the tip side in the saw blade rotation direction. Saw blade for payment. 3. The cutting blade according to claim 2, wherein a tip edge of the tongue piece before bending and raising has a linear portion that is directed rearward in a rotation direction of the saw blade body. . 4. The cutting blade according to claim 2, wherein the tongue piece is formed by forming a deformed through hole that forms an outer edge of the tongue piece in the saw blade body. . 5. The cutting blade according to claim 3 or 4, wherein the bending and raising angle of each of the upper surface protrusions is in the range of 30 ° to 60 °.