JPH0739388Y2 - Saw blade for brush cutter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a saw blade of a brush cutter for cutting bushes, bamboo shoots, plows and the like.

[0002]

2. Description of the Related Art A saw blade 2 of a conventional brush cutter has a right-angled triangular shape as shown in FIGS. 9 and 10, and the saw blade _{2 has} a blade line of a back blade 22. On the other hand, the fold 3 is a clam formed by bending at a right angle.

[0003]

By the way, when an object to be cut is cut by the above-mentioned conventional saw blade 2, the saw blade 2 cuts into the object to be cut and the saw tooth 2 returns from the cut edge of the object to be cut, that is, a clam. The clam becomes smaller due to the pressing force in the direction to eliminate the, and the plate surface of the saw blade comes into contact with the cut edge of the object to be cut, and the sharpness of the saw blade deteriorates. Fold 3 of this is at the cutting order folds 3 of flexion attached to serrated 2 as described above is considerably distant eye bottom from top 2 ₁₁ serrations 2 sawtooth 2
Will receive a large moment from Heaven 2 ₁₁ and the clam will return to its original position. Then, the fold 3 should be provided near the top 2 ₁₁ , but since the saw tooth 2 is worn out and stands out frequently, when the fold 3 is near the top 2 ₁₁ , the saw tooth in the part with the clam disappears. It is a troublesome process to form clams again quickly, and reproducing clams requires advanced technology to distinguish adjacent saw teeth by bending them at the same angle in opposite directions. No one can form a clam. Therefore, if the saw blade 2 is bent near the bottom of the eye, the saw blade can recover the sharpness only by the conspicuous work and can reduce the work to set, but the saw blade is not easily passed during cutting. the height of the teeth with abrasive from said sawtooth is to the sharpened by polishing the upper blade 2 ₃ sawtooth 2 to a conspicuous by wear due to use is lowered. That is, when the diameter of the cutting blade becomes smaller and the cutting blade rotates, the peripheral speed at the ceiling 2 ₁₁ becomes slower and the sharpness is lowered. In view of the above, the present invention intends to provide a cutting blade that prevents the set of the saw blade 2 from returning to the original state and that the diameter of the cutting blade does not change even when it is conspicuous so that a good sharpness can be maintained. Is.

[0004]

The blade body portion 1 ₂ of the substrate 1 SUMMARY OF THE INVENTION In one having a saw 2, labeled with clams, tooth base 2 ₄ upward glance 2 ₁ blade width a sawtooth 2 saw blade 2 the substantially sawtooth 2 became trapezoidal provided by tandem to the blade body 1 ₁ of the substrate 1, further clam each sawtooth 2 above the back edge 2 ₂ side of the saw-tooth 2 of Motohaba b than Ya ofゝnarrow width The distance c between the top 2 ₁₁ of the upper eye 2 ₁ and the fold 3 of the clam is ₃ on the side of the upper blade 23 of the saw blade 2 and the rear corner 2 ₁₂ of the upper eye 2 ₁ and the fold 3 of the clam 3
The saw blades 2 adjacent to each other are bent alternately from the folds 3 of the clams so as to have a width wider than the distance d between them. The back blade ₂₂ of the saw blade ₂ may be a straight blade 2 ₂₁ or a concave blade 2 _22. .

[0005]

When a relatively thick shrub is cut off using the saw blade of the present invention, when the saw blade is a conventional saw blade, when the saw blade 2 cuts into the shrub, the saw tooth 2 is sandwiched by the cut end of the shrub and swung. 2 is pushed back to be in a non-set state, and both front and back surfaces of the saw blade including the saw blade 2 come into contact with the cut end of the shrub, and especially the saw blade 2
The friction resistance between the front and back sides and the cut end is increased to reduce the sharpness. When the sharpness is lowered as described above, the saw blade is strongly pressed against the shrub in order to improve the sharpness and a forcible cutting operation is performed, so that the saw blade generates heat and generates thermal strain, which makes it difficult to use. If this state is further continued, the temperature of the saw blade will rise further and the saw blade will be burned back and will be useless. However, in the present invention, the shape of the sawteeth 2 is substantially trapezoidal, and the folds 3 attached to the sawteeth 2 are inclined upward to form the crests of the sawtooth 2 having the substantially trapezoidal shape, and the top edge 2 ₁₁ and the fold 3 on the back blade 2 ₂ side are folded. horn 2 after the interval c of the upper blade 2 ₃ side ₁₂ and fold 3 each sawtooth 2 cut when cutting shrubs by the greater than the distance d between is pressed from its both sides behind the blade 2 ₂ This hardly deformed because short distance d of the upper blade 2 ₃ side opposite to clam becomes resistance sawtooth 2 is by a smooth cutting prevents the return to the original as eye swing side is to return to the original It is a thing.

The saw blade 2 is to be sharpened again with a grindstone or a file for blade attachment when the tooth is worn out and cuts off after a long period of use, but the conventional saw blade 2 is as shown in FIG. a such right triangle in which the sharpened by sharpening upward glance 2 ₁ that downward inclined surface. If sharpen the saw-tooth 2 from the back edge 2 ₂ side of the vertical plane, the sharpening of research for sawtooth 2 is missing in the tooth decreases the strength becomes rapidly small use upward glance
It would sharpen the 2 _1. Also the sawtooth 2 by sharpening upward glance 2 ₁ sawtooth 2 every time the conspicuous is the saw blade rotates its diameter becomes smaller height of the teeth becomes little by little lower peripheral speed of the saw teeth 2 parts of new Compared with time, it deteriorates and the sharpness deteriorates. The saw blade has a high peripheral speed at the saw tooth 2 part, and therefore can cut the object satisfactorily. When the peripheral speed at the saw tooth 2 part is reduced, the sharpness is remarkably reduced, and the cutting is performed well. Can not be.

[0007] This point saw blade of the present invention ceases expired sawtooth 2, only to sharpen the back edge 2 ₂ sawtooth second upward glance 2 ₁ sharpening was not because of the conspicuous diameter of the saw blade There is little decrease, and there is no big change in the peripheral speed when rotating, which facilitates the cutting of the object to be cut, especially the shrub. If the saw teeth 2 have a substantially trapezoidal shape,
The range polishing if Kome sharpening from the back edge 2 ₂ side when conspicuous is at long life to accommodate long-term cutting払作industry without reducing the strength of the sawtooth 2 be repeated conspicuous because it is large Also, when the back blade 2 side of the saw blade 2 is sharpened, the back blade 2 ₂ and the upper eye 2 ₁
The cutting angle of the saw tooth 2 formed by and does not change with respect to the object to be cut, and always maintains a predetermined optimum cutting angle.

[0008] back blades 2 ₂ sawtooth 2 are considered those with concave ones the edge line is straight. The straight ones sawtooth 2 with back blades 2 ₂ blade wire considerable thin shrubs which is an object to be cut products and bamboo, suitable for cutting such things such as Japanese pampas grass, behind these the cutlery is straight edge line cutting by Nagiharau by blade 2 _2. Further, the saw blade ₂ of which the blade line of the back blade 22 is concave is suitable for cutting a shrub having a relatively large diameter. When the saw blade 2 cuts an object to be cut,
The hook-shaped sharp blade cuts the object to be cut while scratching it, so the blade cuts smoothly and satisfactorily. When cutting is performed for a long period of time, the blade wears and stops, but in this state, it is enough to make the conspicuousness that is the reproduction of the blade, the former straight blade line is ground with a grindstone or a flat file, The latter concave blade line may be ground for attachment by a round file.

[0009] In conspicuous sawtooth 2 above, with a substantially trapezoidal sawtooth 2, the back edge 2 ₂ of the top 2 ₁₁ side of the fold 3 of the clam back blade 2 ₂ side of the blade sharpening saw toothed 2 The sharpness of the saw blade from the bottom of the eye is extremely small, and not only does the peripheral speed during rotation not decrease, but good sharpness can be maintained. Back blade
The width between the upper blade 2 ₂ and the upper blade 2 ₃ becomes smaller, the durability against the pushing of the substrate 1 from the plate surface direction lowers, and even if it becomes difficult to maintain the set of the saw blade 2, the saw blade 2 will not be visible. As it stands up, the distance between the fold 3 and the rear corner 2 ₁₂ becomes smaller, and the clam keeps its original state without any change, even withstanding the force to restore the clam pushed from the plate surface direction of the substrate 1. To do. The sharpness of the saw blade is different from that of sharpening the upper blade of the saw blade because it sharpens the back blade 2 ₂ side, so there is no change in the shape of the saw tooth or the distance between the bottom and the upper eye. It is difficult to cause the rotation balance to be lost due to the change of the saw teeth in the.

[0010]

Embodiments of the present invention will be described with reference to the accompanying drawings. In the drawing, the embodiment of the saw blade shown in FIG.
2 ₂ shows a saw blade for straight brush cutter, saw tooth 2 of the saw blade of the embodiment In addition Figure 7 shows is an enlarged view but Uraha 2 ₂ becomes concave arc shape.

Reference numeral 1 denotes a substrate made of a circular steel plate having a diameter of 255 mm, which has been heat-treated as a cutting tool. The substrate 1 has a size of 230 mm in addition to the embodiment, and the point is that it is suitable for cutting work. I wish I had it. 2 is a sawtooth number eyes provided on the blade body 1 ₁ of the peripheral portion of the substrate 1 is 40 sheets, each saw tooth 2 to be next phase to form a clam bent alternately toward the front and back direction of the substrate 1 ing. The number of the saw teeth 2 of the saw blade is 40, but this number is 50.
The number may be 30 or 30 as long as it is suitable for cutting an object to be cut, and the shape of the saw blade 2 also has a straight blade 2 ₂₁ in the embodiment shown in FIGS. 1 and 2. Uraha 2 ₂ with sawtooth 2 trapezoid inclination of the upper blade 2 ₃ opposite small almost vertical rake angle with respect to the center of the substrate 1 is increased, the fold 3 for configuring the clams Uraha 2 ₂ is an upward slope at an angle of approximately 15 degrees toward the upper blade 2 _3, yet the Izure or the other to 0.8 mm approximately upward glance 2 ₁ to deflect the front surface or back surface of the substrate 1 from the fold 3 sawtooth 2 bending, obtained by the clam return of small saw teeth, saw-tooth 2 is not limited to the above-described configuration, upward glance 2 ₁ blade width a further large have an angle Besides rake angle is more large The fold line 3 may have a large inclination angle, and the point is that the fold line 3 corresponds to the object to be cut and can be cut. In addition, the saw-tooth 2 Example with Uraha 2 ₂ having a concave blade 2 ₂₂ as shown in FIG. 7 Uraha 2 ₂
Is standing at an angle close to the vertical toward the center of the substrate 1, but at the tip of the cutting edge (top 2 ₁₁ ), a concave blade 2 ₂₂ consisting of a semi-circular recess with a diameter of about 5 rim is provided to form a hook shape. serrations when the blade was sharp cut-cored angle with respect to the switching thereof, serrated 2 enters off a thick cut-entering into shrubs as ceiling 2 ₁₁ serrations 2 enters off while cutting the object to be cut was the switching thereof in The clam of No. 2 may not be restored to the original. It should be noted that the concave blade ₂₂₂ may have the saw blade 2 most suitable for the object to be cut by changing the diameter of the saw blade 2 and the saw tooth 2 is not limited to the above-described embodiment, and the object to be cut is not limited to the above example. Anything suitable for cutting may be used.

[0012]

[Effect of the invention] Effect of claim 1, wherein the invention is a long period without having to weaken the sawtooth 2 from the shape of the sawtooth 2 sharpen the back edge 2 ₂ serrations 2 becomes yet conspicuous substantially trapezoidal The saw blade 2 is economical because it can be used for a long life, and the saw teeth 2 are the upper folds of the folds 3 attached to the saw teeth 2 in forming a set.
The position or upward glance 2 ₁ and fold wide upper blade 2 ₃ side at intervals of between 3 Uraha 2 ₂ side from 2 ₁ By been comb狹, upward glance 2 ₁ and fold 3
狹have upper blade 2 ₃ parts side serrated 2 even when wide blade width a of the bending moment to be made sturdy sawtooth second upward glance 2 ₁ to the front and back direction of the substrate 1 of the distance between the unchanged is clams . Therefore, even when cutting into the cut object, the saw blade 2 withstands the force to restore the set from the cut end of the cut object, the set edge does not change, and the saw blade does not clog the cut object and cuts smoothly. Can be sustained.

[0013] Next serrated 2 of upward glance 2 ₁ by the substantially trapezoidal length become longer th elevational Ken the From back edge 2 ₂ side of the saw-tooth 2 sawtooth 2 intensity repeated without reducing It is conspicuous and the saw blade can be used for a long time. The sawtooth 2 is a tooth is robust to better withstand the impact force or the like from the switching Subjected from Uraha 2 ₂ for a trapezoid.

[0014] Effect of claim 2, wherein the invention may endured damage to an impact force received sawtooth 2 from Uraha 2 ₂ when cut thin shrubs and bamboo stems, hard stalks vegetation such a like grass Since the sawtooth can be cut lightly without doing so, the sawtooth can increase its rotation speed, and by rotating it faster, the rotation speed around the sawtooth portion is increased and the sawtooth 2 is cut. The cutting force can be further improved. The back edge of the saw tooth 2 2 ₂ and upward glance 2 ₁ and the crossing angle is as Uraha 2 ₂ sharpening changing the inclination angle of the back edge 2 ₂ when the ceiling 2 ₁₁ parts have a rake angle of an acute angle to be cut smaller things and so can be cut in the ceiling 2 _11, but which can cut the thick stalk shrubs like.

[0015] Effect of claims 3, wherein the invention is, by the back edge 2 ₂ and the concave blade 2 ₂₂ behind the blade 2 ₂ parts of the saw teeth 2, upward glance 2 ₁
The heavens 2 ₁₁ has a sharp scoring angle, and when cutting a thick-stem shrub, etc., which is the object to be cut, the objects to be cut are cut like the heavens 2 ₁₁ of the upper eye 2 ₁ scoop, so that the cutting quality is good. Good cutting is possible. Furthermore concave blade 2 ₂₂ enables angular adjustment suitable Heaven 2 ₁₁ rake angle rake angle can be adjusted in upward glance 2 ₁ by changing the diameter of the switching thereof. Also is intended that the sharpness when grinding the concave blade 2 ₂₂ a round rasp easily recovered in the case of the back edge 2 ₂ off ceases eyes standing sawtooth 2 by use of conspicuous serrations 2 Uraha 2 serrated 2 to be ground toward the upper blade 2 ₃ side from the ₂ side are those capable of long-term use without reducing the speed of the periphery of the saw teeth due to a reduction in strength.

[Brief description of drawings]

FIG. 1 is a front view of a saw blade for a brush cutter, showing a first embodiment of the present invention;

FIG. 2 is a plan view of the saw tooth shown in FIG.

FIG. 3 is a partially enlarged view of a saw tooth viewed from the front.

FIG. 4 is a plan view of the saw tooth shown in FIG.

5 is an end view of the portion AA in FIG. 3,

6 is an end view of the BB portion of FIG. 3,

FIG. 7 is an enlarged view of a saw blade for a brush cutter, showing a second embodiment of the present invention as seen from the front,

8 is a diagram for explaining the conspicuousness of the saw teeth of FIG. 7,

FIG. 9 is an enlarged front view showing a conventional saw tooth,

10 is a plan view of the saw tooth shown in FIG. 9. FIG.

[Explanation of symbols]

1 Board 1 ₁ Blade 2 Sawtooth 2 ₁ Top 2 ₁₁ Top 2 ₁₂ Back Angle 2 ₂ Back Blade 2 ₂₁ Straight Blade 2 ₂₂ Concave Blade 2 ₃ Top Blade 2 ₄ Tooth Root 3 Fold a Width b Width c Interval d interval

Claims (3)

[Scope of utility model registration request] 1. A having a sawtooth 2 Asari is attached to the blade body 1 ₂ of the substrate 1, upward glance 2 ₁ blade width a sawtooth 2 than Motohaba b of the tooth base 2 ₄ sawtooth 2 andゝ狹have provided a saw 2 becomes substantially trapezoidal width is tandem to the blade body 1 ₁ of the substrate 1, further the respective sawtooth 2 clams of upward glance 2 ₁ behind blade 2 ₂ side of the saw-tooth 2 The distance c between the top 2 ₁₁ and the clam fold 3 should be larger than the distance d between the rear corner 2 ₁₂ of the upper eye 2 ₁ and the clam fold 3 on the upper blade 2 ₃ side of the saw blade 2. A saw blade for a brush cutter, wherein adjacent saw teeth 2 are alternately bent from a fold 3 of a set. 2. A bush cutter for saw blade according to claim 1, wherein the back edge 2 ₂ sawtooth 2 characterized in that it is a straight blade 2 _21. 3. A saw blade for brush cutter according to claim 1, wherein the back edge 2 ₂ sawtooth 2 characterized in that it is a concave blade 2 ₂₂