JP3229401U - Brush cutter cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover for a brush cutter capable of preventing pebbles existing on the ground around the grass from being blown off and reducing the generation of noise when cutting the grass. SOLUTION: The operation rod has an operation rod 3 and a rotary cutting blade 20 attached to a tip portion of the operation rod 3, and the operation rod has a drive shaft 4 rotated by a force transmitted from a drive source, and the operation rod has an operation rod 4. In a mowing machine having a gear housing 10 connecting the tip of the drive shaft and the rotary mowing blade to the tip of the gear housing, the front side surface 21 of the rotary mowing blade located on the gear housing side is The cover body 31 covering from the gear housing side constitutes the mowing machine cover 30, and the cover body is located on the opposite side of the gear housing side in a state where the front side surface 21 of the rotary mowing blade is covered from the gear housing side. The back side surface 22 of the rotary cutting blade is exposed toward the outside of the cover body. [Selection diagram] Fig. 3

Description

The present invention relates to a brush cutter cover of a brush cutter in which an operator cuts grass growing on the ground by rotating a brush cutter attached to an end of an operation stick.

Brush cutters are widely used to mow the grass that grows on the ground. A general brush cutter includes an operating paddle, a drive source consisting of an electric motor and an engine connected to the operating paddle, and a brush cutter attached to the tip of the operating paddle. The cutting blade is rotated by a force transmitted from a drive source (see, for example, FIG. 1 of Patent Document 1).
Some types of cutting blades have a metal blade formed on the periphery thereof (see, for example, FIG. 2 of Patent Document 2). In such a cutting blade, the metal blade of the rotating cutting blade cuts the leaves and stems of the grass growing on the ground, and the grass is cut off.

Another type of cutting blade has a resin cord cutter formed on the peripheral edge thereof (see, for example, FIG. 4 of Patent Document 3). In such a cutting blade, a rotating cord cutter cuts the leaves and stems of the grass growing on the ground, and the grass is cut off.

Japanese Unexamined Patent Publication No. 10-229722 Japanese Unexamined Patent Publication No. 10-313635 JP-A-2017-205124

Pebbles are often scattered on the grassy ground that is being cut off by a brush cutter. When a metal blade or cord cutter with a rotating cutting blade hits a pebble on the ground, the pebble is thrown around. The pebbles that flew away fly in various directions.
In some cases, the pebbles can flick towards the operator operating the brush cutter and hit the operator. In addition, the brush cutter may be damaged if the pebbles that are blown off hit the brush cutter.

The present invention is intended to solve the above problem. The purpose is that when cutting grass with a brush cutter, even if the rotating brush cutter flicks pebbles, the pebbles that are blown off will be used by the operator or the brush cutter to operate the brush cutter. To provide a brush cutter cover that can prevent damage.

The present invention has the following configuration in order to solve the above problems.
The cover for a mowing machine according to the invention of claim 1 has an operating rod, a rotary mowing blade attached to the tip of the operating rod, and a drive source provided at the rear end of the operating rod. The operating rod internally has a drive shaft that is rotated by a force transmitted from the drive source, and the tip of the operating rod connects the tip of the drive shaft and the rotary cutting blade. The front side surface of the rotary mowing blade located on the gear housing side in a mowing machine having a gear housing and accommodating a gear for transmitting the rotation of the drive shaft to the rotary mowing blade. The cover body is located on the opposite side of the gear housing side in a state where the cover body covers the front side surface of the rotary cutting blade from the gear housing side. The back side surface of the rotary cutting blade is exposed toward the outside of the cover body.

The brush cutter cover according to the invention of claim 2 is the brush cutter cover according to claim 1, wherein the cover body covers the front side surface of the rotary brush cutter from the gear housing side. On the surface of the cover body facing the front side surface of the rotary brush cutter blade and on the surface of the cover body facing the peripheral edge portion of the rotary brush cutter blade are covered with a member made of an elastic body. It is characterized by being covered.

The brush cutter cover according to the invention of claim 3 is the brush cutter cover according to claim 1 or 2, and the end portion of the cover body is rotatably supported by the operation rod. The axial direction of this axial support is orthogonal to the axial direction of the drive shaft and is also orthogonal to the rotation center axial direction of the rotary brush cutter.

When the cover body covers the front side surface of the rotary cutting blade from the gear housing side, the back side surface of the rotary cutting blade is exposed toward the outside of the cover body.
A worker who operates a brush cutter can cut and mow grass stems and leaves growing from the ground by moving the back surface of the rotary brush cutter along the ground.
Even if the rotary cutting blade flicks the pebbles, the bounced pebbles hit the cover body and stop, preventing them from hitting objects or people outside the cover body.

The surface of the cover body facing the front side surface of the rotary cutting blade and the surface of the cover body facing the peripheral edge of the rotary cutting blade are covered with a member made of an elastic body. The elastic body that covers the surface of the cover body absorbs the energy of the pebbles that the rotary cutting blade flicks off, and reduces the damage that the flicking pebbles hit other objects.
In addition, the elastic body that covers the surface of the cover body can absorb and soften the noise generated when the rotary cutting blade flicks pebbles.

The elastic body that covers the surface of the cover body can be formed by a member made of rubber. The elastic body that covers the surface of the cover body can also be formed of a member made of resin. The elastic body that covers the surface of the cover body can also be formed by a rag cloth such as a waste cloth.
By rotating the cover body around a portion pivotally supported by the operation paddle, the rotary cutting blade can be completely exposed to the outside of the cover body. By exposing the rotary brush cutter blade in this way, it is possible to mow the grass growing in a place where the cover body interferes with the mowing work.

It is a perspective view of a brush cutter. In FIG. 1, the cover for the brush cutter is not shown. It is a side view of the tip part of the operation pad in the state which the cover body covers the front side surface of the rotary mowing blade from the gear housing side. It is a front view of the tip part of the operation pad in the state where the cover body does not cover the front side surface of the rotary cutting blade from the gear housing side. It is a front view of the cover body in the state which the cover body covers the front side surface of the rotary mowing blade from the gear housing side. It is a rear view of the cover body in the state which the cover body covers the front side surface of the rotary mowing blade from the gear housing side. It is the top view of the cover body in the state which the cover body covers the front side surface of the rotary mowing blade from the gear housing side. It is a top view of a cover body. It is the bottom view of the cover body in the state which the cover body covers the front side surface of the rotary mowing blade from the gear housing side.

An embodiment of the present invention will be described with reference to FIGS. 1 to 8.
The brush cutter 1 has an engine forming a drive source 2, an operating paddle 3, and a rotary brush cutter 20. In FIG. 1, the illustration of the brush cutter cover 30 described later is omitted.
The operation paddle 3 has a substantially pipe shape and has a built-in drive shaft 4. The drive shaft 4 has a configuration that rotates by a force generated in the drive source 2. A handle 5 is provided in the vicinity of the central portion of the operation paddle 3. The outer diameter of the pipe forming the operation paddle 3 is d1.

The central axis CL1 of the operation paddle 3 overlaps and coincides with the rotation central axis of the drive shaft 4.
A gear housing 10 is formed at the tip of the operating paddle 3. The gear housing 10 connects the tip of the operation paddle 3 and the rotary cutting blade 20. A columnar protrusion 11 is formed on the top of the gear housing 10 connected to the tip of the operation paddle 3, and a recess 12 is formed on the side of the columnar protrusion 11.
The gear housing 10 has a built-in gear 13. The gear 13 has a configuration in which the rotation of the drive shaft 4 is transmitted to the rotary mowing blade 20 and the rotary mowing blade 20 is rotated by the force of the drive source 2.

The rotary cutting blade 20 has a disk shape and has a front side surface 21, a back side surface 22, and a circumferential side surface 23. The front side surface 21 is located on the gear housing 10 side, and the gear housing 10 is placed on the front side surface 21. The rotary cutting blade 20 is connected to the gear 13 by a bolt 24 penetrating the center thereof. One or a plurality of cord cutters 25 are planted on the circumferential side surface 23.
The center axis CL2 of the bolt 24 overlaps and coincides with the rotation center axis of the rotary cutting blade 20.

The central axis CL1 and the central axis CL2 exist on one virtual plane F.
The distance from the back side surface 22 measured along the central axis CL2 to the bottom of the recess 12 is h1.
The distance from the back side surface 22 measured along the central axis CL2 to the position on the circumferential side surface 23 where the cord cutter 25 is planted is h2.

A cover body 31 is formed at the tip of the operation paddle 3.
The cover body 31 has a substantially cylindrical shape having a height h3, and has a substantially cylindrical peripheral edge portion 32 and a substantially circular upper surface 33. One end of the cylinder forming the cover body 31 is closed by the upper surface 33, and the other end of the cylinder forming the cover body 31 is open.

The elastic body 36 covers the inner side surface 35 of the cover body 31. The elastic body 36 is formed of an elastic rubber member.
A semicircular semicircular hole 37 is opened in the center of the upper surface 33. In the semicircular hole 37, the length of the crescent-shaped chord corresponds to the outer diameter of the columnar protrusion 11 of the gear housing 10.
A circular circular hole 38 is formed in the elastic body 36 that covers the inner side surface 35 of the cover body 31. The center of the semicircular hole 37 and the center of the circular hole 38 are both on the central axis CL2. The diameter of the circular hole 38 is slightly smaller than the diameter of the semi-circular hole 37.

On the upper surface 33 of the cover body 31, a positioning member 40 having a substantially U shape is erected in the vicinity of the semicircular hole portion 37. The positioning member 40 has legs 41 and 42, and a central rod-shaped member 43 that connects the legs 41 and the rear ends of the legs 42 to each other. The leg 41, the central rod-shaped member 43, and the leg 42 are continuously connected in order in a substantially U-shape. The tip of the leg 41 and the tip of the leg 42 are fixed on the upper surface 33. The distance between the tip of the leg 41 and the tip of the leg 42 is the same as the length of the central rod-shaped member 43, and is larger than the outer diameter d1 of the operation paddle 3.

The central axis CL3 of the central rod-shaped member 43 is orthogonal to the central axis CL1 and also orthogonal to the central axis CL2, and is parallel to the upper surface 33.
The distance between the upper surface 33 and the central rod-shaped member 43 is h4.
The following relationships are established between h1, h2, h3 and h4.
h1> h3 + h4
h2 ≧ h1- (h3 + h4)

A rotation bearing member 50 having a substantially U shape is erected in the vicinity of the peripheral edge of the upper surface 33 of the cover body 31. The rotation bearing member 50 has legs 51 and 52, and a central rod-shaped member 53 that connects the legs 51 and the rear ends of the legs 52 to each other. The legs 51, the central rod-shaped member 53, and the legs 52 are continuously connected in order in a substantially U-shape.
The distance between the tip of the leg 51 and the tip of the leg 52 is larger than the length of the central rod-shaped member 53, and the length of the central rod-shaped member 53 is substantially the same as the outer diameter d1 of the operating paddle 3.

The central rod-shaped member 53 of the rotary bearing member 50 serves as a shaft and is pivotally supported on the surface of the operation paddle 3. The central axis CL4 of the central rod-shaped member 53 is orthogonal to the central axis CL1 and also orthogonal to the central axis CL2, parallel to the upper surface 33, and parallel to the central axis CL3.
By pivotally supporting the central rod-shaped member 53 on the surface of the operation paddle 3, the cover body 31, the positioning member 40, and the rotary bearing member 50 are integrated around the central axis CL4. It is configured to be rotatable.

The center point of the semi-circular hole 37, the center point of the circular hole 38, the middle center point between the tip of the leg 41 of the positioning member 40 and the tip of the leg 42, the middle center point of the central rod-shaped member 43 of the positioning member 40, rotation The intermediate center point between the tip of the leg 51 and the tip of the leg 52 of the support member 50 and the intermediate center point of the central rod-shaped member 53 of the rotary support member 50 all exist on the virtual plane F.
A notch 60 is formed on the upper surface 33 of the cover body 31.
The notch 60 is continuous from the semicircular hole portion 37 to the boundary 34 between the upper surface 33 and the peripheral edge portion 32 with a width having the same length as the diameter of the semicircular hole portion 37. The notch 60 that has reached the boundary 34 is continuous with the notch 61 formed in the peripheral edge portion 32. The width of the notch 61 is the same as the width of the notch 60. An elastic body 36 covering the inner side surface 35 of the cover body 31 is exposed from the notch 60 and the notch 61.

The elastic body 36 exposed from the notch 60 and the notch 61 is cut by one continuous cut 62 from the circular hole 38. The cut 62 exists on the virtual plane F.
On the upper surface 33, the positioning member 40 straddles the notch 60 between the legs 41 and the leg 42, and the rotation bearing member 50 straddles the notch 60 and the notch 60 between the legs 51 and the legs 52. It straddles the notch 61.

The distance on the virtual plane F between the intermediate center point of the central rod-shaped member 53 of the rotary bearing member 50 and the intermediate center point of the central rod-shaped member 43 of the positioning member 40 is determined by the central rod-shaped member of the rotary bearing member 50. It is equal to the distance on the virtual plane F between the intermediate center point of 53 and the recess 12 on the side of the columnar protrusion 11 of the gear housing 10.
The cover body 31, the positioning member 40, and the rotary bearing member 50 form the brush cutter cover 30.
The above is the configuration of the brush cutter cover 30.

The action and effect will be described below.
First, a case where a worker cuts grass growing on a flat ground having a certain area by using a brush cutter 1 will be described.
First, the operator rotates the brush cutter cover 30 around the central axis CL4, and covers the front side surface 21 of the rotary brush cutter 20 from the gear housing 10 side by the cover body 31.
At this time, the central rod-shaped member 43 of the positioning member 40 is fitted into the recess 12 on the side of the columnar protrusion 11 of the gear housing 10.

The columnar protrusion 11 of the gear housing 10 passes through the semicircular hole portion 37 of the upper surface 33 of the cover body 31 and the circular hole portion 38 of the elastic body 36.
Further, the portion of the operation paddle 3 on the gear housing 10 side passes through the notch 60 and the notch 61. When the operating paddle 3 passes through the notch 60 and the notch 61, the operating paddle 3 passes between the cutout 62 of the elastic body 36.
When the cover body 31 covers the front side surface 21 of the rotary cutting blade 20 from the gear housing 10 side and the cover body 31 is viewed from the side, the front side surface 21 of the rotary cutting blade 20 and the cord cutter 25 are peripheral portions. The back side surface 22 of the rotary cutting blade 20 is visible protruding from below the peripheral edge portion 32 without being visible behind the 32.

In this state, when the cover body 31 is viewed from the lower bottom surface side, the back side surface 22 of the rotary cutting blade 20 and the cord cutter 25 are exposed.
The elastic body 36 that covers the inner side surface 35 of the cover body 31 faces the front side surface 21 of the rotary mowing blade 20 and also faces the circumferential side surface 23 of the rotary mowing blade 20.
The operator uses the cord cutter 25 of the rotary cutting blade 20 to mow the grass that grows on the ground while the cover body 31 covers the front side surface 21 of the rotary cutting blade 20. When pebbles are scattered on the grassy ground, the pebbles are blown off by the rotating cord cutter 25.

The pebbles blown off by the cord cutter 25 hit the elastic body 36 covering the inner side surface 35 of the cover body 31 and fall to the ground as it is. The cover body 31 prevents the pebbles that have been blown off from flying out of the cover body 31.
Further, the noise generated when the cord cutter 25 flicks the pebbles is absorbed by the elastic body 36 covering the inner side surface 35 of the cover body 31 and weakened.
Next, a case will be described in which the grass that grows on a narrow area or the hairline of a tree from the ground is cut off using the brush cutter 1.

First, the operator rotates the brush cutter cover 30 around the central axis CL4 so that the entire rotary brush cutter 20 is exposed to the outside from the cover body 31.
The operator operates the handle 5 while rotating the rotary cutting blade 20 while keeping the entire rotary cutting blade 20 exposed to the outside from the cover body 31, and tilts the rotating rotary cutting blade 20 to obtain an area. Mow the grass that grows in narrow places or on the hairline of trees from the ground.

By making the entire rotary cutting blade 20 exposed to the outside from the cover body 31, the rotating rotary cutting blade 20 can be inserted into a narrow place, a hairline from the ground of a tree, or the like.
When the elastic body 36 covering the inner side surface 35 of the cover body 31 deteriorates or is damaged, the damaged elastic body 36 may be replaced with a sound elastic body 36.

Since it is a cover for a brush cutter as described above, it is useful in cutting grass that grows on the ground or the like.

1 Mowing machine 2 Drive source 3 Operating rod 4 Drive shaft 5 Handle 10 Gear housing 11 Cylindrical protrusion 12 Recess 13 Gear 20 Rotating mowing blade 21 Front side surface 22 Back side surface 23 Circumferential side surface 24 Bolt 25 Cord cutter 30 Mowing machine cover 31 Cover body 32 Peripheral part 33 Upper surface 34 Boundary 35 Inner side surface 36 Elastic body 37 Semi-circular hole part 38 Circular hole part 40 Positioning member 41, 42 Leg 43 Central rod-shaped member 50 Rotating support member 51, 52 Leg 53 Central rod-shaped member 60 , 61 Notch 62 Cutout d1 Outer diameter of operating rod CL1 Central axis of operating rod CL2 Central axis of bolt CL3 Central axis of central rod-shaped member of positioning member CL4 Central axis of central rod-shaped member of rotary support member h1 Central axis CL2 Distance from the back side of the rotary mowing blade to the bottom of the recess h2 measured along the distance from the back side of the rotary mowing blade measured along the central axis CL2 to the position where the cord cutter is planted h3 Cover Height h4 Distance between the upper surface of the cover body and the central rod-shaped member of the positioning member

Claims (3)

It has an operation paddle, a rotary cutting blade attached to the tip of the operation paddle, and a drive source provided at the rear end of the operation paddle.
The operating paddle has a drive shaft inside which is rotated by a force transmitted from the drive source.
The tip of the operating paddle has a gear housing that connects the tip of the drive shaft and the rotary cutting blade.
The gear housing is used in a brush cutter that houses a gear that transmits the rotation of the drive shaft to the rotary brush cutter.
It has a cover body that covers the front side surface of the rotary cutting blade located on the gear housing side from the gear housing side.
In a state where the cover body covers the front side surface of the rotary brush cutter from the gear housing side, the back side surface of the rotary brush cutter located on the opposite side of the gear housing side is the outside of the cover body. A cover for brush cutters that is characterized by being exposed toward. In a state where the cover body covers the front side surface of the rotary cutting blade from the gear housing side.
The surface of the cover body facing the front side surface of the rotary brush cutter blade and the surface of the cover body facing the peripheral edge of the rotary brush cutter blade are covered with a member made of an elastic body. The cover for a brush cutter according to claim 1, wherein the cover is provided. The end portion of the cover body is rotatably supported by the operation rod, and the axial direction of the axial support is orthogonal to the axial direction of the drive shaft and the rotation of the rotary cutting blade. The cover for a mowing machine according to claim 1 or 2, wherein the cover is also orthogonal to the central axis direction.