JP3326050B2 - Trimmer and safety cover for trimmer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush cutter,
In particular, the present invention relates to a structure of a safety cover of a brush cutter that can be mounted by replacing a plate-shaped cutting blade with a linear cutting blade.

[0002]

2. Description of the Related Art Conventionally, there have been known a brush cutter equipped with a plate-like cutting blade (blade) and a brush cutter equipped with a linear cutting blade (line trimmer). ing. Such a brush cutter is equipped with a safety cover that covers the rear of the blade so that the stones and the like flipped by the blade do not hit the operator during work.

[0003] Recently, there has been a type in which a blade cutter and a line trimmer can be replaced by one brush cutter. In such dual-purpose brush cutters, the blades are thin and small in diameter, while the line trimmer has a thick reel portion and is generally larger than the blade in terms of the tip diameter of the trimmer.

For this reason, a safety cover having a height and an outer diameter suitable for the blade is too small to cover a sufficient range when the line trimmer is mounted, and conversely, a safety cover having a height and an outer diameter suitable for the line trimmer. In this case, there is a problem that the safety cover is too deep when the blade is mounted, so that the blade cannot be brought close to the ground, so that sufficient mowing cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optimum safety cover in a combined type brush cutter in which a blade type blade and a line trimmer type blade can be replaced and used.

[0006]

Means for Solving the Problems, Embodiments of the Invention and Effects of the Invention According to the brush cutter of the present invention, which has been made to achieve the above object, a plate-shaped cutter is provided with respect to a rotary driving portion at a shaft tip. Yes constructed so that it can be mounted replace the blade and the linear cutting blade, fixes the safety cover of the inner and outer double structure for the cutting blade of the plate to the housing of the rotary drive unit, the safety in mowing machine as also may cover a range to be covered with respect to the linear cutting blade by sliding one out either cover obliquely downward, the safety
The cover has a sloping surface that extends downward and is equipped with a plate-shaped cutting blade.
When worn, the lower end is located below the plate-shaped cutting blade.
Size that can cover the rear of the plate-shaped cutting blade
A first safety cover having:
It can slide diagonally along the slope, and when it is moved upward
When it is moved downward by overlapping the first safety cover
To extend the slope of the first safety cover
It is spread out to a size that can cover the back
And a second safety cover .

According to this brush cutter, when the plate-shaped cutting blade is mounted, the safety cover is used in a double structure, and when the linear cutting blade is mounted, one of the inner and outer sides is obliquely downward. The user is allowed to slide to increase the height and diameter, thereby covering the area to be covered .

According to this brush cutter, when the plate-shaped cutting blade is mounted, the second safety cover is moved upward and used. As a result, the rear of the blade is covered with the first safety cover having a height and a size that is just right for the plate-shaped blade, and the blade is brought to a position where it comes into contact with the ground. Can perform sufficient mowing.

On the other hand, when the linear cutting blade is mounted, the second
Use the safety cover by moving it downward. Thereby, as a whole, the inclined surface of the first safety cover is extended and spread as a whole, and the rear of the linear cutting blade can be sufficiently covered and concealed. Therefore, even when cutting with the linear cutting blade, scattering of stones and the like can be accurately prevented.

Further, in the present invention, the second safety cover, which extends the inclined surface of the first safety cover, is slidably provided instead of replacing the safety cover, so that the two safety covers are stored.・ Since there is no need to manage, it is simple.
Further, since the second safety cover uses the inclined surface of the first safety cover, the second safety cover does not have to be large itself, and the size of parts can be reduced.

Here, for example, only one large safety cover suitable for a linear cutting blade is used, and this is moved up and down to change the mounting height, so that it can be used for a plate-shaped cutting blade. Look at it as compared to In this comparative example, it is necessary to prepare a large safety cover by itself, and in view of manufacturing equipment, a large metal mold is required. On the other hand, in the brush cutter of the present invention, a safety cover having a height suitable for a linear cutting blade is configured by using the inclined surface of the first safety cover suitable for a plate-shaped cutting blade. Therefore, there is an advantage that each component can be reduced in size and the manufacturing equipment such as a mold can be reduced in size accordingly. Also, when the brush cutter is closed, the second safety cover can be moved upward and overlapped with the first safety cover, so that there is an advantage that the storage size can be reduced. In addition, in the comparative example, a safety cover that is too large is attached to the plate-shaped cutting blade,
There is also a problem that a part which is hidden by the cover and cannot be seen becomes wide, a range which cannot be approached by the cover is widened, and a dead space is increased. ADVANTAGE OF THE INVENTION According to this invention, it can be advantageous also in the point that the problem of increase of a dead space at the time of using a plate-shaped cutting blade does not arise.

Further, in the brush cutter according to the present invention, when a plate-shaped blade is used, scattering of stones and the like can be prevented by the double structure safety cover. Since the plate-shaped cutting blade is hard and strong, the rocks and the like that have been blown off have a large energy. For this reason, the stones and the like will strongly collide with the safety cover. However, the double structure has the effect of not losing the strong collision energy and improving the durability of the safety cover. On the other hand, in the case of a linear cutting blade, the energy given to the stones and the like is relatively small because the cutting blade itself is flexible and flexible. Can withstand.

For example, an oblique bracket is formed on the housing of the drive unit, and a single safety cover is slidably mounted on the bracket to mount the plate-shaped cutting blade and the linear cutting blade. However, in such a structure, a single safety cover must always be able to withstand the impact of rocks and the like, and as a result, the safety cover must be made thicker to take measures. Is required. As is clear from this, the brush cutter according to the present invention has an advantage in that when the stones or the like are strongly blown off, the brush cutter has a double structure, and an effect that the original thickness does not need to be increased can be expected. Configuration.

That is, the brush cutter according to the present invention not only contributes to easy storage and management of the safety cover, but also to reduction in the storage size and the size of the manufacturing equipment. The use of a second safety cover that has the same slope as the surface and overlaps the first safety cover when moving upwards. " The strength that should be possessed by each of the cutting blades is accurately realized, and the durability can be improved without waste. In addition, since the durability can be improved without waste, various effects are expected in addition, such as the first safety cover does not need to be unnecessarily thick.

The inclined surfaces of the first and second safety covers may have an appropriate distance from the tip of the linear cutting blade when extended to the height of the blade surface of the linear cutting blade. It is sufficient that an angle that can be used is adopted, and the angle does not need to be more gentle than necessary. Such a brush cutter of the present invention can be configured using the following safety cover.

That is, a safety cover to be mounted on a brush cutter, wherein a plate-shaped cutting blade and a linear cutting blade can be replaced and mounted on a rotary drive unit at the tip of a shaft. , Has a downwardly extending inclined surface,
Located below the plate-shaped cutting blade attached to the cutting machine
Te, a first safety cover having a size that can cover the rear of the plate-shaped cutting blade, slidable obliquely along the inclined surface of the first safety cover is moved upward The first safety cover overlaps with the first safety cover when it is moved downward, and when it is moved downward, the first safety cover is extended to a size that allows the inclined surface of the first safety cover to be extended to cover the back of the linear cutting blade. A second safety cover, wherein the second safety cover is inserted into the long groove radially provided on the inclined surface of the first safety cover, and the two safety covers are brought into close contact by tightening. A safety member for a brush cutter which is slidably attached to the first safety cover by means of a screw member which makes both safety covers slidable by loosening the cover. Can be.
The second safety cover may be attached to either the inside or the outside of the first safety cover.

According to this safety cover, if the screw member is loosened, the second safety cover can slide along the long groove. Then, if the screw member is moved upward to a position overlapping with the first safety cover and the screw member is tightened, a safety cover having a low structure and a small outer diameter is obtained. On the other hand, when the screw member is loosened and the second safety cover is moved downward and then tightened, a safety cover having both a height and an outer diameter that is increased can be formed. By replacing this safety cover with a conventional safety cover, the existing brush cutter can be easily remodeled into the brush cutter of the present invention.

The safety cover can slide on the second safety cover while being guided by the long groove.
The operation is simple. In this brush cover, the portion of the first safety cover where the long groove is provided is formed as a bulging portion that bulges upward, and the bulging portion faces the second safety cover. It is preferable to provide a ceiling part that is partially cut out as described above, and to guide the sliding direction between the ceiling part and the bulging part when sliding in the oblique direction. With this configuration, if the first safety cover is securely fixed to the housing of the drive member, the second safety cover can be easily slid between the upper and lower positions. Further, since the first safety cover and the second safety cover can be fixed so as not to rotate, there is no possibility that the second safety cover is distorted even if the second safety cover collides with the ground or the like during work.

Based on the gist of the present invention as described above, it is a matter of course that various embodiments can be adopted.

[0020]

Next, an example which specifically shows an embodiment of the present invention will be described. Brush cutter 10 of this embodiment
As shown in FIG. 1 and the like, a blade (saw blade) 15 and a line trimmer 17 made of nylon can be exchanged and mounted on the rotation drive unit 13 at the tip of the shaft 11. I have. 1 to 5,
(A) shows when the blade is mounted, and (B) shows when the line trimmer is mounted.

The brush cutter 10 according to the present embodiment includes a safety cover 20 having a dual inner / outer structure. More specifically, a first safety cover 30 having a height and a mounting diameter capable of covering the rear of the blade 15 is provided, and slidably disposed outside the first safety cover 30. Second
And a safety cover 40.

The first safety cover 30 has a fan shape in a plan view. The first safety cover 30 has a horizontal ceiling portion 31, an inclined surface 32 extending obliquely downward from the ceiling portion 31, and a vertical surface connected to the tip of the inclined surface 32. The ceiling 31 has a bulging portion 34 bulging upward. Then, as shown in FIG. 3 to FIG.
Are set so as to be sandwiched from the side, and are fixed with screws 35.

The second safety cover 40 is also substantially fan-shaped in plan view, and has a horizontal ceiling portion 41, an inclined surface 42 extending obliquely downward from the ceiling portion 41, and a tip end of the inclined surface 42. And a continuous vertical surface 43. In the ceiling part 41,
The first safety cover 30 is cut out in a substantially U-shape so as to face the bulging portion 34, and a rib 45 rising vertically is provided at an edge of the cutout portion 44. The inclined surface 42 has the same angle as the inclined surface 32 of the first safety cover 30.

The bulging portion 3 of the first safety cover 30
As shown in FIGS. 3 to 5, a long groove 36 is provided on the slope of the second safety cover 40.
A hole 46 is provided at a position overlapping with 6. This hole 46
And a threaded knob 51 from the outside so as to pass through
Is inserted, and the nut 53 prevents the rear surface from falling off. Thus, the second safety cover 40 is attached to the first safety cover 30 so as to be able to slide obliquely.

The brush cutter 10 also has a front safety cover 60 attached thereto. FIG.
Reference numeral 70 denotes a code cutter provided for adjusting the length of the line trimmer. Brush cutter 1 of the embodiment
When the blade 15 is attached to use the second safety cover 40, the second safety cover 40 is moved upward as shown in FIG.
Use with 0 and 40 overlapped. When the line trimmer 17 is used, the second safety cover is moved downward as shown in (B) of each drawing, as if the inclined surface 32 of the first safety cover 30 was extended. Use by setting to the state. In the embodiment, FIG.
As shown in (1), the height of the first safety cover 30 increases by H and the mounting diameter increases by R. At this time, as shown in the figure, the rear of the line trimmer 17 can be exactly covered and concealed.

Such movement is achieved by loosening the knob 51 and
The safety cover 40 is made slidable, and is slid along the long groove 36. When the knob 51 is tightened at the upper end of the long groove 36, the safety cover 20 can be set to a state in which the blade is used.
By tightening 1, the safety cover 20 can be set to the state when the line trimmer is used.

Since the safety cover 20 is constructed as described above, the safety cover 20 in the embodiment becomes a safety cover having a height and an outer diameter suitable for the blade size when the blade is used, as shown in FIG. The mowing operation can be performed sufficiently close to the ground. Since the outer diameter is not too large, the dead space does not increase.

In this state, as shown in FIG. 5A, the inclined surface 32 and the vertical surface 33 of the first safety cover 30 are provided.
Are the inclined surface 42 and the vertical surface 43 of the second safety cover 40.
Is doubled. As a result, there is an advantage that even if a rock or the like is strongly blown off by the blade 15, the collision can be sufficiently endured and the safety cover 20 is hardly damaged.

On the other hand, when the line trimmer is used, the safety cover 20 is used by being pulled down as shown in FIG. 3B, and functions as a cover having a height and an outer diameter matching the line trimmer 17. As a result, it is possible to accurately prevent the stones and the like flipped by the line trimmer 17 from colliding with the worker, and to compensate for comfortable work.

Further, in using such a device, the second
Of the second safety cover 4 is fixed to the housing 19 with the first safety cover 30 interposed therebetween.
It is not necessary to make 0 itself large enough to hold the housing 19. Therefore, the line trimmer 17
Despite realizing the height and outer diameter that match, the individual parts do not increase in size, and when these parts are manufactured by injection molding with synthetic resin, the mold does not increase There are advantages too.

In addition, since the second safety cover 40 has a configuration in which the cutout portion 44 of the ceiling portion 41 holds the bulging portion 34 of the first safety cover 30 from the side,
When the second safety cover 40 is slid up and down, a guide action is exerted and the second safety cover 40 can be easily moved to a correct position without distortion. Also, the second safety cover 40 is tightened with only the knob 51,
Since the configuration in which the second safety cover 40 is held is adopted, there is also an effect that the second safety cover 40 is not distorted even when the second safety cover 40 collides with the ground or the like when the line trimmer is used.

Further, since the safety cover 20 has a double structure to increase the strength corresponding to the use of the blade, the thickness of the first safety cover 30 can be reduced. In addition, according to the embodiment, instead of replacing the safety cover, the second safety cover 40 is slidably attached to the first safety cover 30, and the position is changed as necessary. Since there is no need to separately store and manage the two safety covers, there is also an effect that is simple. Further, when the brush cutter is stored, if the second safety cover 40 is set to the raised position, there is also an effect that the brush can be stored compactly.

Since the second safety cover 40 is slidably attached to the first safety cover 30, the first safety cover 30 can be attached to an existing brush cutter. If it does, existing brush cutters can be easily modified in the same way as in the embodiment.

Although the embodiment of the present invention has been described with reference to one embodiment, the present invention is described above, for example, the inner side of a double-structured safety cover may be slidably formed. The present invention is not limited to the embodiments, but can be specifically implemented in various forms.

[Brief description of the drawings]

FIG. 1 is a right side view of a main part of a brush cutter according to an embodiment.

FIG. 2 is a front view of a main part of the bush cutter of the embodiment.

FIG. 3 is a plan view of a main part of the bush cutter of the embodiment.

FIG. 4 is a bottom view of a main part of the brush cutter of the embodiment.

FIG. 5 is a vertical sectional view of a main part of the brush cutter of the embodiment.

[Explanation of symbols]

10 ... brush cutter, 11 ... shaft, 13 ...
Rotation drive unit, 15 blade, 17 line trimmer, 19 motor housing, 20 safety cover, 30 first safety cover, 31 ceiling, 32 ..Inclination surfaces, 33 ... vertical surfaces, 34 ...
Swelling part, 35 ... screw, 36 ... long groove, 40 ...
2nd safety cover, 41 ... ceiling part, 42 ... inclined surface, 43 ... vertical surface, 44 ... cutout part, 45 ...
・ Rib, 46 ・ ・ ・ Hole, 51 ・ ・ ・ Screw knob, 53 ・
..Nut, 60 ... Front safety cover, 70 ...
Code cutter.

Claims (3)

(57) [Claims] 1. A relative rotary drive of the shaft tip, Yes and configured to be mounted to replace the plate-shaped cutting blade and the linear cutter blade, and out relative to the plate-like cutting blade The double-layered safety cover is fixed to the housing of the rotation drive unit, and at least one of the inside and outside of the safety cover is slid obliquely downward to cover the area to be covered by the linear cutting blade. In such a brush cutter , the safety cover has an inclined surface extending downward, and when a plate-shaped cutting blade is mounted.
The lower end is located below the plate-shaped cutting blade,
A first size large enough to cover the back of the blade
Slidable obliquely along the inclined surface of the first safety cover and the first safety cover
When it is moved upward, it overlaps with the first safety cover.
And the inclined surface of the first safety cover when moved downward.
Can be extended to cover the back of the linear cutting blade
Consists of a second safety cover that is spread out in size
A brush cutter characterized by the following. 2. A safety cover mounted on a brush cutter, wherein a plate-shaped cutting blade and a linear cutting blade can be replaced and mounted on a rotary drive unit at a tip of a shaft. It has an inclined surface that spreads downward, and the lower end is attached to the brush cutter.
It has been positioned lower than the plate-like cutting blade, first with a size that can cover the rear of the plate-like cutting blade
And a slidable obliquely along an inclined surface of the first safety cover. The safety cover overlaps the first safety cover when moved upward and the first safety cover when moved downward. A second safety cover which is in a state where the inclined surface of the cover is extended so as to be able to cover the back of the linear cutting blade and is widened, and wherein the second safety cover is provided with the first safety cover. A long groove radially provided on the inclined surface of the safety cover, and a screw member which is inserted into the long groove, makes both safety covers in close contact by tightening, and makes both safety covers slidable by loosening the screw member. A safety cover for a brush cutter, wherein the safety cover is slidably attached to the safety cover. 3. The safety cover for a brush cutter according to claim 2 , wherein the first safety cover is formed as a bulging portion in which a portion provided with the elongated groove bulges upward. The cover has a ceiling partly cut away so as to face the bulging part, and guides the sliding direction between the ceiling part and the bulging part when sliding in the oblique direction. A safety cover for a brush cutter, characterized in that: