JP3290430B2 - Brush cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bush cutter suitable for cutting weeds.

[0002]

2. Description of the Related Art A conventional brush cutter is disclosed in Japanese Utility Model Laid-Open No. 3-858.
No. 20 has been proposed. In this brush cutter, a rotary shaft is supported downward through a housing with respect to a distal end portion of an operation rod held by an operator, and the circular saw is rotated by the rotary shaft. Further, the circular saw is almost entirely covered by an upper cover and a lower cover, and provided with concave portions on both left and right sides of the upper cover and the lower cover, through which mowing objects such as weeds can enter.

On the other hand, a conventional brush cutter is disclosed in
Japanese Patent No. 5086 has also proposed. In this brush cutter, the central portions of a pair of upper and lower rotating disks are fitted and fixed to the rotating shaft supported by the housing, and the two rotating disks are tiltably connected by a connecting pin with a centrifugal blade interposed therebetween,
A protective cover is provided to cover the upper and lower rotating disks from above and below.

[0004]

In the former bush cutter, the circular saw is covered by the upper cover and the lower cover, so that the circular saw is prevented from hitting the circular saw even if empty bottles and empty cans are in the weeds. Therefore, the circular saw can be protected and safety can be improved. However, this brush cutter has a problem in that the circular saw cannot be attached to or detached from the rotary shaft while the cover is attached to the housing.

On the other hand, in the latter brush cutter, the centrifugal blade is tiltably connected to the rotating disk, so that when an empty can or wire hits the centrifugal blade, the impact can be reduced. However, when replacing a worn centrifugal blade, it is necessary to remove the lower protective cover, and then remove the rotating disk with the centrifugal blade from the rotating shaft, which makes replacement work very troublesome. Was.

The present invention has been made in view of the problems existing in the prior art as described above, and its object is to improve safety and to provide a plurality of blades on the outer periphery. It is an object of the present invention to provide a brush cutter capable of attaching and detaching a rotating disk to and from a rotating shaft without removing a cover.

[0007]

According to a first aspect of the present invention, a housing is mounted on the distal end of an operating rod, and a rotating shaft is protruded downward from the housing to rotate the operating shaft. The rotating disk is detachably fitted to the lower end of the shaft, and a plurality of blade portions are provided on the outer peripheral portion of the rotating disk via a plurality of blade mounting protrusions. A cover for covering the blade portion is attached, and a coating portion for covering the distal end portion of each blade mounting projection provided with the blade portion from above, below and from the outside in the radial direction is provided on the outer peripheral portion of the main body of the cover. A plurality of recesses are formed in the outer peripheral portion of the covering portion so as to allow the cut object to enter the turning trajectory of each of the blade portions, and an outer diameter of the rotating disk is provided below the covering portion. Inner diameter smaller than the diameter of the turning locus circle of the blade portion The blade is provided in the cover body by incorporating an operation of projecting the blade mounting protrusion outward in the radial direction from the recess in a state in which a cover body is formed in the housing and a cover body is mounted on the housing. The gist of the present invention is that the rotating disk can be mounted thereon.

According to a second aspect of the present invention, in the first aspect, the first to fourth blade mounting projections are provided on the rotary disk at a predetermined pitch at an equal angle, and the blade mounting projection is mounted. A brush cutter configured so that the rotating disk is mounted in the cover body by performing the following steps. First
And a step of causing the second blade mounting protrusion to enter the inside of the covering portion through the access hole and projecting the first blade mounting protrusion from one recess formed in the covering portion. The second blade mounting protrusion enters the inside of the covering portion, the third blade mounting protrusion is displaced inside the inner peripheral edge of the insertion / removal hole, and the fourth blade mounting protrusion is moved outside the covering portion. A process to be placed on the side. The third blade mounting protrusion enters the inside of the covering portion, and the second blade mounting protrusion projects outward from the recess, and the fourth blade mounting protrusion located on the lower outer surface of the covering portion is put in and out. The gist is to displace inward from the inner peripheral edge of the hole and enter the inside of the covering portion.

According to a third aspect of the present invention, in the first aspect, the first to sixth blade mounting projections are provided on the rotary disk at equal angles at a predetermined pitch. A brush cutter configured so that the rotating disk is mounted in the cover body by performing the following steps.

A step of inserting the first to third blade mounting projections into the inside of the covering portion through the insertion / removal hole, and arranging the fourth to sixth blade mounting projections outside the covering portion. The second and third blade mounting protrusions protrude outward from the concave portion, the fourth blade mounting protrusion is disposed on the lower outer surface of the covering portion, and the fifth and sixth blade mounting protrusions are formed in the insertion holes. The process of displacing inward from the periphery.

It is essential that the rotary disk be moved while moving the fifth and sixth blade mounting projections into the inside of the covering portion until the fourth blade mounting projection is displaced inward from the inner peripheral edge of the access hole. And

According to a fourth aspect of the present invention, a housing is mounted on the tip of the operating rod, the rotating shaft projects downward from the housing, and a rotating disk is detachably fitted to the lower end of the rotating shaft. A plurality of blades are provided on the outer peripheral portion of the rotating disk via a plurality of blade mounting protrusions, and the housing is provided with a cover main body that covers the blade mounting protrusions and the blades,
A coating portion is formed on the outer peripheral portion of the cover main body to cover the tip portion of the blade portion and each blade mounting protrusion from above, below, and from the outside in the radial direction, and the outer peripheral portion of the coating portion is covered with a coating portion. A plurality of recesses that allow the brush cutter to enter the turning trajectory circle of each blade portion are formed at a plurality of locations, and a prepared hole is formed below the covering portion,
A rotating disk insertion / removal passage provided with the blade portion is provided on the rear outer peripheral portion of the covering portion, and in a state where the cover body is attached to the housing, the rotating disk can be mounted in the cover main body from the insertion / removal passage. The gist of the present invention is as follows.

According to a fifth aspect of the present invention, in the fourth aspect, the outer diameter of the rotary disk is set to be smaller than the width of the access passage, and the revolving locus circle of the blade portion of the blade mounting projection. In a state in which one end of the access passage enters and enters a recess formed by the adjacent blade attachment protrusion, the blade attachment protrusion located on the other edge side of the access passage is set to be smaller than the diameter dimension of the adjacent blade attachment protrusion. The gist of the present invention is that it is configured to be able to penetrate the inside of the edge and enter the cover body.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the cover body includes an upper plate portion, an outer peripheral plate portion, and a lower plate portion. The gist is that it is attached to the housing by a bracket.

According to a seventh aspect of the present invention, in any one of the first to fifth aspects, the rotary disk is sandwiched between upper and lower clamp plates, and has a smaller diameter than the clamp plates. And a screw space and a nut for tightening and fixing the clamp plate and the gap adjusting plate, and a clamping space formed by the clamp plates in a direction outside the outer peripheral edge of the gap adjusting plate. In
A ring portion, a plurality of blade mounting protrusions integrally formed on the outer periphery thereof, and the ring portion of the rotary blade body including a blade portion attached to each blade mounting protrusion are tightened and fixed from above and below, and rotated. In a state where the rotary blade body is being rotated synchronously by the rotation of the disk, when an external impact force of a predetermined value or more acts on the rotary blade body, the contact surface between the two clamp plates and the ring portion is configured to slip. The point is that

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 10, a handle 12 is provided at an intermediate portion of the operation rod 11 of the brush cutter.
Is installed. As shown in FIG. 1, a closed cylindrical housing 13 is connected to the distal end of the operating rod 11 downward so as to open the lower end. A rotating shaft 14 is provided in the housing 13 with a pair of upper and lower radial ball bearings 1.
5 and 15 are rotatably supported at predetermined positions.

The rotating shaft 14 includes a driving shaft 16 penetrating through the operation rod 11, a driving bevel gear 17A provided at the tip of the driving shaft 16, and a driven bevel gear provided on the rotating shaft 14 so as to mesh with the driving bevel gear 17A. 17B. The drive shaft 16 is provided with the operation rod 11 shown in FIG.
Clutch box 1 on the engine 18 attached to the base end of the
9.

As shown in FIGS. 1 and 2, a disc-shaped rotary disk 21 is mounted on the spline portion 14a of the rotary shaft 14. A flange portion 14b is formed integrally with an intermediate portion of the rotary shaft 14. The flange portion 14b
Between the lower surface of the rotary disk 21 and the upper surface of the rotary disk 21 so as to be integrally rotatable with the spline portion 14a.
2 is interposed. As shown in FIG.
As shown in the figure, a bulging portion 22a is integrally formed, and this bulging portion 22a is fitted into a hole 21a formed in the center of the rotating disk 21. On the lower surface of the rotating disk 21, the mounting plate 2 loosely fitted to the lower end of the rotating shaft 14
3 is abutted. The mounting plate 23 is pressed against the lower surface of the rotating disk 21 by a bolt 24 screwed to the lower end surface of the spline portion 14a, and the rotating disk 21 is sandwiched and fixed between the mounting plate 22 and the upper mounting plate 22.

As shown in FIG. 3, the rotating disk 21 has three members, namely, an upper clamp plate 25 and a lower clamp plate 26, and outer surfaces of the clamp plates 25 and 26 interposed between the clamp plates 25 and 26. A gap adjusting plate 27 having a smaller diameter than the diameter, and a screw 28 and a nut 2
9 fasten each other. Holes 25a, 27a into which the outer peripheral edges of the bulging portion 22a below the mounting plate 22 are fitted at the center of the clamp plate 25 and the interval adjusting plate 27.
Are formed. The center of the clamp plate 26 is a hole 2 into which the outer peripheral edge of the bulging portion 23a above the mounting plate 23 is fitted.
6a are formed. In addition, 25b, 26b, 27b
Are holes for inserting the screws 28, holes 25c of both clamp plates,
26c is for weight reduction.

Next, the rotary blade 31 mounted on the rotary disk 21 will be described. A ring 32 having a donut plate shape of the rotary blade 31 is formed between the clamp plates 25 and 26. The inner peripheral edge of the ring portion 32 is slidably in contact with the outer peripheral edge 27c of the gap adjusting plate 27. A plurality of (four in this embodiment) blade mounting protrusions 32 are provided on the outer peripheral portion of the ring portion 32.
a to 32d are integrally formed, and first to fourth blade portions 33a to 33d are mounted on the first to fourth blade mounting projections 32a to 32d.

As shown in FIG. 2, a mounting boss 13a is integrally formed at a lower portion of the housing 13, and a flange 13b is integrally formed at an upper portion of the mounting boss 13a. A cover 41 that covers the first to fourth blade portions 33a to 33d is mounted on the mounting boss portion 13a. The cover 41 includes a cover body 42,
A bracket 43 is provided for attaching the cover body 42 to the attachment boss 13a. The bracket 43 includes a ring portion 43a fitted on the outer periphery of the mounting boss portion 13a, and a plurality of arm portions 43b integrally formed radially on the outer periphery of the ring portion 43a and welded to the upper surface of the cover body 42. To 43b. The upper surface of the ring portion 43a contacts the lower surface of the flange portion 13b as shown in FIG.
It is tightened and fixed by a tightening ring 46 having a female screw 46a screwed into a male screw portion 13c formed on the outer periphery of 3a. Reference numeral 45 denotes the flange portion 13b and the tightening ring 4.
6 is a disc spring interposed between the two.

The cover body 42 includes an upper plate portion 42a press-formed from a plate material, an outer peripheral plate portion 42b, and a lower plate portion 42.
c, the cross section is formed in a horizontal U-shape, and a plurality of concave portions 42e to 42e having an arc-shaped planar shape are formed near the outer periphery of the covering portion 42d formed by the three members. Among these many concave portions 42e to 42e, the size of at least two concave portions 42e, 42e is
The first to fourth blade mounting projections 32 a to 32 d are set to have such a size that they can protrude outward in the radial direction of the cover body 42. Most of the recesses 42e to 42e guide the object to be cut into the turning locus circle of the blade portion during the mowing operation, but one recess 4 formed on the rear side edge of the cover body 42.
2e 'discharges the cut grass and the like to the outside of the cover main body 42.

The upper hole 42f formed on the inner peripheral side of the upper plate portion 42a and the access hole 42g formed on the inner peripheral side of the lower plate portion 42c are circular. Also, as shown in FIG. 1, the inner diameter D1 of the access hole 42g is formed larger than the outer diameter D2 of the ring portion 32.
Further, the diameter 2R, which is twice the radius dimension R of the rotation locus circle at the tip of the blade mounting protrusions 32a to 32d (first to fourth blade portions 33a to 33d) about the center O of the ring portion 32, It is set to be larger than the inner diameter D1 of the access hole 42g. Then, with the cover 41 attached to the housing 13, the rotating disk 2 with the rotating blade body 31 attached thereto
1 into and out of the cover hole 42g of the cover main body 42 through the hole 42g.
It is configured so that it can be put in and out of d.

In this embodiment, the outer diameter D2 of the ring portion 32 mounted on the rotating disk 21 is the outer diameter of the rotating disk.
A configuration in which 2 is integrally formed is also conceivable.

Next, the cover 41 of the brush cutter and the rotary blade 31
Will be sequentially described. The following operation is performed to mount the cover 41 on the housing 13. In FIG. 2, the cover 41 is attached to the mounting boss 13a of the housing 13.
The ring portion 43a of the bracket 43 is tightened and fixed at a predetermined position using a disc spring 45 and a tightening ring 46.

Next, the interval adjusting plate 27 is placed on the upper surface of the lower clamp plate 26, and the inner peripheral edge of the ring portion 32 of the rotary blade body 31 is slidably contacted with the outer peripheral edge of the interval adjusting plate 27. Combine. Thereafter, the upper clamp plate 25 is placed on the upper surfaces of the lower clamp plate 26 and the interval adjusting plate 27.
Further, these members are fastened and fixed to each other by screws 28 and nuts 29. In this state, the rotary blade 3
Although 1 is sandwiched by the rotating disk 21, there is no means for preventing the relative rotation, so that when an external impact of a predetermined value or more is applied to the rotating blade body 31, the relative rotation becomes possible.

Next, an operation of assembling the rotating disk 21 with the rotating blade body 31 assembled therein into the cover 42d with the cover 41 attached to the housing 13 will be described. 6 to 9 are bottom views of the cover 41 and the rotating disk 21 as viewed from below. FIG. 6 shows the lower plate portion 4 of the cover 41.
A state is shown in which the first and second blade mounting projections 32a and 32b are about to enter from the access hole 42g of 2c toward the covering portion 42d.

As shown in FIG. 7, the first blade mounting projection 32a
Into one concave portion 42e to protrude outward, and the second blade mounting projection 32b enters the inside of the covering portion 42d. In this state, the third blade mounting projection 32c is displaced inward from the inner peripheral edge of the insertion / removal hole 42g, and
The blade mounting projection 32d is in contact with the outer surface of the lower plate portion 42c.

Next, the rotary blade 21 is moved together with the rotary blade body 31 so as to pull out the first blade mounting projection 32a from the recess 42e as shown in FIG. The blade mounting projection 32b is connected to another recess 42.
e, and the third blade mounting projection 32c enters the inside of the covering portion 42d. In this state, the fourth blade mounting projection 32d is displaced slightly inward from the inner peripheral edge of the insertion / removal hole 42g.

Next, as shown in FIG. 9, the fourth blade mounting projection 32d is made to enter the coating 42d. In this state, the first to fourth blade attachment projections 32a to 33d are all housed inside the covering portion 42d without projecting from the recesses 42e to 42e.

In this state, the hole 21a of the rotary disk 21 is fitted into the bulging portion 22a of the mounting plate 22. Then, the mounting plate 23 is brought into contact with the lower surface of the rotary disk 21 and the bolt 2
4. Tighten and fix.

By the above operation, the mounting of the rotary disk 21 having the rotary blade 31 is performed without removing the cover 41. The operation of removing the rotary disk 21 and the rotary blade body 31 is performed in the reverse order of the above-described mounting operation.

Next, the operation of the bush cutter constructed as described above will be described. When the rotary shaft 14 is rotated, the mounting plates 22 and 23 are rotated via the spline portion 14a, and the rotary disk 21 and the rotary blade 31 are rotated synchronously. In this state, when the cover 41 approaches, for example, a portion where weeds are cut, the concave portions 41e to 41e of the cover 41 are formed.
Since the weeds enter the inside, the first to fourth blade portions 33a to 33a
Cut by 3d. During this mowing operation, if wires or pebbles enter the recess 42e, pebbles or the like are caught between the cover 41 and the first to fourth blade portions 33a to 33d. However, since the rotary blade body 31 is relatively rotated in the rotary disk by the external impact at this time, the cover 41 or the first to fourth blade portions 33a to 33a
The damage of 33d is suppressed.

Next, the effects of the bush cutter constructed as described above will be listed together with the construction. (1) In the above embodiment, the lower plate portion 42 of the cover main body 42
The first to fourth blade mounting projections 32a to 32d of the rotary blade body 31 enter from the insertion / removal hole 42g formed on the inner peripheral side of c, and perform the operation of projecting the mounting projection outward from the recess 42e. It was configured as follows. For this reason, the first to fourth blade portions 33a that cannot perform a swing operation with the cover body 42 attached.
The rotating blade body 31 having the rotation blades 33 to 33 d can be housed inside the cover main body 42 together with the rotating disk 21 and attached to the rotating shaft 14.

(2) In the above embodiment, the rotating disk 2
1 is constituted by both clamp plates 25 and 26 and an interval adjusting plate 27, and the rotating disk 21 presses the ring portion 32 of the rotating blade body 31 to tighten and fix it. For this reason, when an external impact of a predetermined value or more acts on the rotary blade body 31 during the mowing operation, the rotary blade body 31
It is possible to prevent the blade portion from being damaged or the cover main body 42 from being damaged when a small stone or the like is bitten by being relatively rotated in the inside.

(3) In the above embodiment, the cover main body 42 is constituted by the upper plate portion 42a, the outer peripheral plate portion 42b and the lower plate portion 42c, and the cover main body 42 is attached to the housing 13 by the bracket 43. Therefore, the cover body 42 can be easily manufactured by press-molding a flat plate material.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, members having the same functions as those in the above embodiment are denoted by the same reference numerals, and the description of the configuration is omitted.

In this embodiment, the rotary blade body 31 has the first
The sixth to sixth blade attachment projections 32a to 32f and the first to sixth blade portions 33a to 33f are formed at equal intervals. A procedure for accommodating the rotary blade body 31 in the covering portion 42d of the cover 41 will be described.

First, as shown in FIG. 11, the first blade mounting projection 32a is housed inside the covering 42d,
The second and third blade mounting projections 32b and 32c are inserted into and taken out of the hole 4
It is arranged inside from 2 g, and the remaining projections 32d to 32f are arranged outside the covering part 42d.

Next, as shown in FIG. 12, the first to third blade mounting projections 32a to 32c are housed inside the covering portion 42d. At this time, the fourth to sixth blade mounting projections 32d to 32f
Is located outside the covering portion 42d.

Thereafter, as shown in FIG. 13, the second and third blade mounting projections 32b and 32c are made to protrude from the recesses 42e and 42e 'to the outside, and the fourth blade mounting projection 32d is covered with the coating 42d.
Place outside. At this time, the fifth and sixth blade mounting projections 32
e and 32f are located inside the access hole 42g.

In the state shown in FIG. 13, since the fifth and sixth blade mounting projections 32e and 32f can enter the inside of the coating 42d, the fourth blade mounting projection 32d in FIG.
Moves in the direction of the arrow until moves inside the hole 42g.

Further, as shown in FIG. 14, the second and third blade mounting projections 32b, 32c are formed with concave portions 42e, 42e '.
And the fourth blade mounting projection 32
d is housed inside the covering portion 42d. Finally, as shown in FIG. 15, the first to sixth blade mounting projections 32a to 32f are housed inside the covering portion 42d.

The operation of removing the rotating disk 21 from the cover 41 can be performed in reverse to the above-described mounting operation. In this alternative embodiment, the rotary blade body 31 having the first to sixth blade mounting projections 32a to 32f can be mounted inside the covering portion 42d while the cover 41 is mounted.

Next, another embodiment of the present invention will be described with reference to FIGS. In this embodiment, as shown in FIGS. 16 and 17, an access passage 42 through which the rotary blade body 31 is inserted and removed from the rear side of the cover body 42.
h. The rotary blade body 31 has first to sixth blade mounting projections 32a to 32f formed therein.
3a to 33f are provided. The blade mounting projection 32a
32g is defined as a recess 32g, and each blade mounting projection 32a
A portion formed by notching at the tip of 32f is a notch concave portion 32h. As shown in FIG.
A receiving plate 42i is formed on the upper surface of d so as to correspond to each of the recesses 42e, and receives a cut object during the cutting operation. Then, in FIG. 19, when the rotary blade body 31 is rotated in the counterclockwise direction in a state where the object to be cut has entered the concave portion 42e, the object to be cut is supported by the receiving plate 42i. -The cutting operation by the sixth blade portions 33a to 33f is performed smoothly. Temporarily the receiving plate 4
When there is no 2i, the grass is cut off by the edge of the upper plate portion 42a of the concave portion 42e, and the cut grass is covered with the covering portion 42d.
It may be jammed.

At the rear side of the cover body 42, FIG.
As shown in FIG. 19, the width E2 of the lower plate 42c in the same direction is smaller than the width E1 of the upper plate 42a in the radial direction. With this configuration, it is possible to prevent the mowing grass from clogging the inside of the covering portion 42d of the cover main body 42 when the mowing grass is mowing.

As shown in FIG. 21, the width W of the access passage 42h of the cover body 42 is set to be larger than the outer diameter D2 of the ring portion 32 of the rotary blade body 31, and
The diameter 2 of the revolution locus circle of the blade portion 33a of the blade mounting projection 32a
It is set smaller than R. Further, the adjacent first
In a state where one end edge of the access passage 42h enters the concave portion 32g formed by the second blade mounting protrusions 32a and 32b, the third blade mounting protrusion 32 is moved from the concave portion 32g.
c can enter the cover main body 42 through the other end of the access passage 42h.

A method of mounting the rotary blade 31 on the brush cutter of the embodiment configured as described above will be described. As shown in FIG. 21, first and fourth blade mounting protrusions 3 of first to sixth blade mounting protrusions 32 a to 32 f of rotary blade body 31.
2d and 32e are put in and out of the passage 42h through the cover body 42.
To enter. Then, one end edge of the access passage 42h enters into the concave portion 32g formed by the adjacent fifth and sixth blade mounting projections 32e and 32f. In this state, the third blade mounting protrusion 32c is inserted into the covering portion 42d of the cover main body 42 through the other end of the passage 42h. Continuing with this operation, the second blade mounting projection 32b is made to enter the cover 42d of the cover body 42 as shown in FIG. In this state, the first and sixth blade attachment protrusions 32a and 32f remain exposed to the outside. At this time, the two blades 3 provided on the fifth blade mounting projection 32e
3e and 33e are provided with the cover body 42 in the notch recess 32h.
The outer peripheral edge of the covering portion 42d is protruded to the outside from the concave portion 42e of the cover body 42.

In the configuration in which the notch recess 32h is not formed in the blade mounting projection 32e, the blade mounting projection 32
What is necessary is just to set the shape and dimension of the related component so that e can protrude outside from the recessed part 42e.

When the rotary blade 31 is further rotated, FIG.
As shown in FIG. 3, the first to sixth blade mounting projections 32a to 32f
Are all entered into the cover main body 42. In this manner, the rotary blade body 31 is attached to the cover main body 42. In this embodiment, the work of attaching and detaching the rotary blade body 31 to and from the cover main body 42 can be easily performed with one touch.

The above embodiment can be embodied with the following modifications. 24. As shown in FIG. 24, a rotary blade body 31 in which first to third blade mounting projections 32a, 32b, 32c are arranged at three locations at equal intervals may be used.

Also in this case, the rotary blade 3
1, the rotary blade body 31 can be mounted together with the rotary disk 21 without removing the cover 41.

As shown in FIG. 25, the first to sixth blade portions 33a to 33f correspond to the first to sixth blade mounting projections 32a to 32f.
3f may be provided at one place. As shown in FIG.
To the fourth blade mounting projections 32a to 32d,
Blade portions 33a to 33d may be formed in a saw-tooth shape. FIG.
As shown in FIG. 7, the first to sixth blade mounting projections 32a to 32f
And the first to sixth blade portions 33a to 33f may be formed in a sawtooth shape.

Although not shown, in the case of the rotary blade body 31 having the first to fifth blade mounting projections, the circumferentially formed dimension of the concave portion 42e of the cover main body 42 is increased.
Without removing the cover 41, the rotating blade body can be attached and detached in the same manner as the attaching process of the rotating disk having the first to fourth blade attaching protrusions.

In the above embodiments, the first to sixth blade mounting projections 32a to 33f are fixedly provided so as not to swing with respect to the rotating disk 21 or the ring 32. The first to sixth blade mounting projections 32a to
The present invention is also directed to a configuration in which the first and sixth blade mounting projections 32a to 33f are protruded from the concave portion 42e.

[0056]

Since the present invention is configured as described above, it has the following effects. According to the first to seventh aspects of the present invention, safety can be improved, and a rotating disk, which is provided with a plurality of blade portions fixed to the outer periphery and protrudes, is mounted in the cover without removing the cover. be able to.

According to the second aspect of the invention, the rotating disk having the first to fourth blade mounting projections can be easily mounted in the cover. According to the third aspect of the present invention, the rotating disk having the first to sixth blade mounting projections 32a to 33f can be easily attached to and detached from the inside of the covering portion 42d.

According to the fourth aspect of the present invention, when the cover is attached to the housing, the rotating disk can be easily attached to the inside of the cover portion of the cover main body through the passage for inserting and removing the rotating disk.

According to the fifth aspect of the present invention, it is possible to set the width of the access passage small, to increase the number of recesses formed in the cover body, and to lengthen the cutting area. Can be.

According to the sixth aspect of the present invention, the structure of the cover body can be simplified, and the manufacture can be easily performed.
According to the seventh aspect of the present invention, it is possible to prevent damage to the blade portion or the cover when the pebble, the empty can, the wire or the like is caught.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a bush cutter embodying the present invention.

FIG. 2 is an exploded perspective view of a housing and a cover.

FIG. 3 is an exploded perspective view of a rotating disk and a rotating blade body.

FIG. 4 is a plan view of a main part of the bush cutter.

FIG. 5 is a plan sectional view of a main part.

FIG. 6 is a bottom view for explaining a method of mounting the rotary blade body in the cover.

FIG. 7 is a bottom view illustrating the attachment method.

FIG. 8 is a bottom view illustrating the attachment method.

FIG. 9 is a bottom view illustrating the attachment method.

FIG. 10 is a perspective view showing the entire brush cutter.

FIG. 11 is a bottom view for explaining a method of mounting the rotary blade body in the cover.

FIG. 12 is a bottom view illustrating the attachment method.

FIG. 13 is a bottom view illustrating the attachment method.

FIG. 14 is a bottom view illustrating the attachment method.

FIG. 15 is a bottom view illustrating the attachment method.

FIG. 16 is a longitudinal sectional view at the center of a brush cutter showing another embodiment of the present invention.

FIG. 17 is a perspective view of a cover main body used in the embodiment of FIG. 16;

FIG. 18 is a perspective view of a rotary blade used in the embodiment of FIG. 16;

19 is a plan view of a main part of the bush cutter shown in FIG. 16;

FIG. 20 is a plan sectional view of a main part of the bush cutter shown in FIG. 16;

FIG. 21 is a plan view for explaining a method of mounting the rotary blade of the brush cutter shown in FIG. 16;

FIG. 22 is a plan view for explaining a method of mounting the rotary blade of the bush cutter shown in FIG. 16;

FIG. 23 is a plan view for explaining a method of mounting the rotary blade of the brush cutter shown in FIG. 16;

FIG. 24 is a plan view showing another example of the rotary blade body.

FIG. 25 is a rear view showing another example of the rotary blade body.

FIG. 26 is a plan view showing another example of the rotary blade body.

FIG. 27 is a rear view showing another example of the rotary blade body.

[Explanation of symbols]

11 ... operation rod, 12 ... handle, 13 ... housing, 1
4 ... rotating shaft, 21 ... rotating disk, 25 ... upper clamp plate, 26 ... lower clamp plate, 27 ... spacing plate, 31 ...
Rotary blade body, 32 ... Ring part, 32a-32f ... First through sixth blade mounting projections, 33a-33f ... First through sixth blade parts,
41: cover, 42: cover body, 43: bracket,
42a: upper plate portion, 42b: outer peripheral plate portion, 42c: lower plate portion,
42d: coating portion, 42e: concave portion, 42g: access hole,
42h ... access passage.

Claims (7)

(57) [Claims] 1. A housing (13) is mounted on the tip of an operating rod (11), a rotating shaft (14) protrudes downward from the housing, and a rotating disk (21) is attached to a lower end of the rotating shaft (14). Are removably fitted, and a plurality of blade mounting projections (32a to 32
f), a plurality of blade portions (33a to 33f) are provided through the housing (13).
32f) and a cover (41) that covers the blades (33a to 33f), and the blades (33a to 33f) provided with the blades (33a to 33f) are provided on the outer periphery of the body (42) of the cover (41). A covering portion (42d) for covering the distal end portions of the mounting protrusions (32a to 32f) from above, below, and radially outward.
And a plurality of concave portions (42e to 42e) on the outer peripheral portion of the covering portion (42d) which allow the object to be cut to enter the turning locus of each of the blade portions (33a to 33f). Under the covering part (42d), the outer diameter (D2) of the rotating disk (21) is larger than the outer diameter (D2),
3f) An insertion hole (42g) having an inner diameter (D1) smaller than the diameter (2R) of the turning locus circle is formed, and the blade mounting is performed in a state where the cover body (42) is mounted on the housing (13). By incorporating an operation of projecting the projections (32a to 32f) outward from the recesses (42e to 42e) in the radial direction, the cover body (4
2) A brush cutter configured so that a rotating disk (21) having the blade portions (33a to 33f) can be mounted therein. 2. The rotating disk (21) according to claim 1, wherein the rotating disk (21) has first to fourth blade mounting projections (32a to 33).
d) is provided at an equal angle at a predetermined pitch, and a rotating disk (21) equipped with blade mounting protrusions (32a to 33d).
Is a bush cutter configured to be mounted in the cover body (42) by performing the following steps. The first and second blade mounting projections (32a, 32b) enter the inside of the covering portion (42d) from the insertion / removal hole (42g), and the
And projecting the blade mounting projection (32a) outwardly from one recess (42e) formed in the coating (42d). Second
And the third blade mounting projection (32c) is displaced inward from the inner peripheral edge of the insertion / removal hole (42g). Arranging the blade mounting projection (32d) on the outer surface side of the covering portion (42d). The third blade mounting protrusion (32c) enters the inside of the covering portion (42d), and the second blade mounting protrusion (32b) protrudes outward from the recess (42e).
A process of displacing the fourth blade mounting projection (32d) located on the lower outer surface of the covering portion (42d) inside the inner peripheral edge of the insertion / removal hole (42g) and entering the inside of the covering portion; 3. The rotating disk (21) according to claim 1, wherein the rotating disk (21) has first to sixth blade mounting projections (32a to 33).
f) is provided at a predetermined pitch at an equal angle, and a rotating disk (21) equipped with blade mounting protrusions (32a to 33f).
Is a bush cutter configured to be mounted in the cover body (42) by performing the following steps. First to third
The blade mounting projections (32a to 32c) of the
2g) to enter the inside of the covering portion (42d), and the fourth to sixth blade mounting projections (32d to 32f) are covered with the covering portion (42d).
The process to place outside of the. The second and third blade mounting projections (32
b, 32c) project outwardly from the recesses (42e, 42e), the fourth blade mounting projection (32d) is arranged on the lower outer surface of the covering portion (42d), and the fifth and sixth blade mounting projections are provided. (32e,
32f) a step of displacing the inner side of the inner peripheral edge of the access hole (42g). The fifth and sixth blade mounting projections (32e, 3
2f) moving the rotary disk (21) while moving the inside of the covering portion until the fourth blade mounting projection (32d) is displaced inward from the inner peripheral edge of the insertion / removal hole (42g). 4. A housing (13) is attached to the tip of the operating rod (11), a rotating shaft (14) projects downward from the housing, and a rotating disk (21) is attached to the lower end of the rotating shaft (14). Are removably fitted, and a plurality of blade mounting projections (32a to 32
f), a plurality of blade portions (33a to 33f) are provided through the housing (13).
32f) and a cover body (42) that covers the blade portions (33a to 33f), and the outer peripheral portion of the cover body (42) has the blade portions (33a to 33f) and the blade mounting protrusions (3).
2a to 32f) are formed with a covering portion (42d) for covering the tip portion from above, below and from the outside in the radial direction, and the cutting object is provided on the outer peripheral portion of the covering portion (42d). A plurality of recesses (42e to 42e) which can enter the turning locus circle of (33a to 33f) are formed, and a pilot hole (42g ') is formed below the covering portion (42d). (42d) The blade portion (33a-3)
3f), an access passage (42h) for the rotating disk (21) provided with the cover (42) attached to the housing (13), and the rotating disk (21) is removed from the access passage (42h). A brush cutter that is configured to be mounted in a cover main body (42) from above. 5. The rotating disk (21) according to claim 4, wherein an outer diameter dimension (D2) of the rotating disk (21) is different from the diameter of the access passage (42).
h) and smaller than the diameter dimension (2R) of the revolving locus circle of the blade portion (33a) of the blade mounting protrusion (32a), and is set smaller than the adjacent blade mounting protrusion (W). Recesses (32) formed by the portions (32a to 32f)
g) with one end edge of the access passage (42h) entered, the blade mounting projections (32a to 32f) located on the other edge side of the access passage (42h) pass through the inside of the edge. A brush cutter configured to enter the cover body (42). 6. The method according to claim 1, wherein
The cover body (42) is composed of an upper plate (42a), an outer peripheral plate (42b) and a lower plate (42c), and the upper plate (42a) is formed of a housing (13) by a bracket (43). Brush cutter attached to the. 7. The method according to claim 1, wherein
The rotating disc (21) is sandwiched between upper and lower clamp plates (25, 26) and both clamp plates (25, 26), and has a smaller diameter than the clamp plates (25, 26). (27), and a screw (28) and a nut (29) for tightening and fixing both clamp plates and the gap adjusting plate, and the two clamps are provided outside the outer peripheral edge of the gap adjusting plate (27). In a sandwiching space formed by the plates (25, 26), a ring portion (32) and a plurality of blade mounting protrusions (32a to 32) formed integrally on the outer periphery thereof.
f) and blade portions (33a-33) attached to the respective blade mounting protrusions.
f), the ring portion (32) of the rotary blade body (31) composed of the rotary blade (31) is fastened and fixed from above and below, and the rotary blade (31) is rotated synchronously by the rotation of the rotary disk (21). When an external impact force exceeding a predetermined value acts on the rotary blade body (31), the two clamp plates (25, 2) are actuated.
6) A brush cutter configured so that a contact surface between the ring portion and the ring portion slides.