JP2022119244A - Scattering prevention cover and mower - Google Patents

Abstract

To provide a scattering prevention cover capable of preventing scattering of a hard object such as pebble for enhancing safety, and a mower having the same.SOLUTION: A scattering prevention cover 9 fitted to a tip end part of an operation rod of a mower comprises: a substrate 25 covering a top face side of a cutting blade; a cover main body 23 being provided on the substrate 25 and comprising a peripheral wall 27 covering the back face side and side face side of the cutting blade and having an opened lower face; a notch part 27a formed on a front side of the peripheral wall 27; and fixing means 19 fixing the cover main body 23 to the operation rod 3 in a state in which a part of a blade part of the cutting blade 7a is exposed from the notch part 27a. The substrate 25 is formed of a hard material, the peripheral wall 27 has flexibility and can be elastically deformed. The notch part 27a is formed by gradual reduction of a height of the peripheral wall 27.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scattering prevention cover used for a portable lawn mower for cutting weeds, ivy, small trees, etc., and a lawn mower having the same.

2. Description of the Related Art Portable lawn mowers that are held and operated by hand have been conventionally used as a means for cutting weeds, ivy, small trees, etc. in sites, parks, fields, forests, and the like.
This type of mower has a configuration in which a small engine 310 as a drive source is integrally provided at the rear end of a hollow operating rod 304, as described in FIG. 11 of Patent Document 1, for example. A drive shaft that is rotationally driven by a small engine 310 is arranged in the operating rod 304 . A gear portion 10 is provided at the tip of the operating rod 304 to change the direction of the shaft center substantially vertically while transmitting the rotation of the drive shaft. ing.
A handle 308 is attached near the rear end of the operation rod 304, and the operator holds the handle 308 with both hands and operates the throttle lever 307 to move while rotating the cutting blade 60 or swing the operation rod 304 left and right. By doing so, it is possible to expand the cutting area.

A protective cover 313 is attached to the front end of the operating rod 304 to prevent grass clippings and the like cut by the rotation of the cutting blade 60 from scattering toward the operator.

JP 2017-212905 A Japanese Unexamined Patent Application Publication No. 2016-135108

By the way, when cutting an object to be cut such as grass in this type of mower, the cutting blade often hits hard objects such as pebbles and scatters them. As described above, the conventional lawn mower is partially provided with the protective cover 313 mainly to prevent the scattering of weeds and the like to the operator. Approximately the entire circumference of the blade 60 is covered.
For this reason, there is a risk that hard objects such as pebbles will scatter and hit passers-by and buildings near the work site.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and provides a scattering prevention cover capable of preventing scattering of hard objects such as pebbles and enhancing safety, and a mower having the same. its main purpose.

SUMMARY OF THE INVENTION The present invention has been made to achieve the above objects. A shatterproof cover for use in a lawn mower that is rotated by a power source and that cuts an object by contacting a blade portion provided on the cutting blade, comprising: a substrate covering an upper surface side of the cutting blade; a cover body having a peripheral wall covering the back side and left and right side sides of the cutting blade and having an open lower surface; a notch formed in the front side of the peripheral wall; and fixing means for fixing the cover main body to the operating rod in a state in which a part of the cover is exposed from the notch.

According to a second aspect of the invention, there is provided the shatterproof cover according to the first aspect, wherein the substrate is made of a rigid material, and the peripheral wall is made of a flexible and elastically deformable material. A shatterproof cover characterized by

The invention of claim 3 is the scattering prevention cover according to claim 1 or 2, wherein the notch is formed by gradually decreasing the height of the peripheral wall. be.

According to a fourth aspect of the present invention, there is provided the scattering prevention cover according to the second or third aspect, wherein the substrate is made of metal and the peripheral wall is made of synthetic rubber.

According to the fifth aspect of the invention, a cutting blade rotatably supported on the tip of an operating rod is rotated by a drive source integrally provided with the operating rod, and the cutting edge provided on the cutting blade touches the object to be cut. A lawn mower having a configuration for cutting by contact and having a scattering prevention cover fixed to the operating rod, wherein the scattering prevention cover is the scattering prevention cover according to any one of claims 1 to 4. The lawn mower is characterized by being a protective cover.

Advantageous Effects of Invention According to the present invention, it is possible to prevent objects to be cut such as grass from scattering, and to prevent hard objects such as pebbles from scattering, thereby enhancing safety.
When the peripheral wall is made of a flexible material, it is possible to reduce the impact sound of hard objects such as pebbles, thereby suppressing noise.

1 is an exploded perspective view of a scatter prevention cover according to an embodiment of the present invention; FIG. FIG. 2 is a schematic cross-sectional view showing how the anti-scatter cover shown in FIG. 1 is attached to the mower. FIG. 3 is a partially omitted view of the anti-scattering cover shown in FIG. 2 as viewed from below; FIG. 3 is a schematic cross-sectional view showing a state of the anti-scattering cover shown in FIG. 2 when in use; FIG. 2 is a perspective view showing a usage state of the mower having the anti-scattering cover shown in FIG. 1;

Hereinafter, a scattering prevention cover and a lawn mower according to an embodiment of the present invention will be described with reference to the drawings.

First, referring to FIG. 5, the overall configuration of the mower 1 having the anti-scatter cover according to the present embodiment will be described. FIG. 5 shows how the lawn mower 1 is used at a work site.
The mowing machine 1 rotates a cutting blade 7 rotatably supported at the tip of an operation rod 3 by a drive source integrally provided with the operation rod 3, and a blade portion 7a provided on the cutting blade 7 cuts grass or the like. It has a configuration that cuts by contacting the reaping object.
More specifically, the lawn mower 1 includes a hollow operation rod 3 extending linearly, a gear unit 5 connected to the tip 3a of the operation rod 3, and a gear unit 5 rotatably attached to the lower end of the gear unit 5. a disc-shaped cutting blade 7, a scattering prevention cover 9 fixed to the tip portion 3a of the operation rod 3 so as to cover the cutting blade 7, and a rear end side of the operation rod 3 integrally provided with the operation rod 3. It has a small engine 11 as a drive source, a handle 13 fixed near the rear end of the operating rod 3, a throttle lever 15 provided at one grip portion of the handle 13, a shoulder belt 17, and the like. .

A drive shaft 21 (see FIG. 2) for transmitting the rotation of the engine 11 to the gear unit 5 to rotate the cutting blade 7 is arranged inside the operating rod 3 .
The cutting blade 7 is rotated by operating the throttle lever 15, and the amount of rotation can be adjusted by the amount of grip.
By moving forward holding the mower 1, the operator W can advance the cutting blade 7, and by swinging the operating rod 3 left and right, the cutting area can be expanded.
5, the direction indicated by arrow F is the front side, the direction indicated by arrow L is the left side, the direction indicated by arrow R is the right side, the direction indicated by arrow K is the rear side, and the direction indicated by arrow K is the rear side. The side indicated by Z1 is the top side, and the side indicated by the arrow Z2 is the bottom side.

As shown in FIG. 1, the anti-scatter cover 9 has a substrate 25 covering the upper surface of the cutting blade 7 and peripheral walls 27 provided on the substrate 25 and covering the rear surface and left and right side surfaces of the cutting blade 7. A cover body 23 with an open lower surface, a notch portion 27a formed on the front side of the peripheral wall 27, and a state in which a part of the blade portion 7a (see FIG. 3) of the cutting blade 7 is exposed from the notch portion 27a. It has fixing means 19 for fixing the cover main body 23 to the operating rod 3 .

The substrate 25 is made of a hard material, here made of a metal material, specifically a stainless alloy. The peripheral wall 27 is made of a flexible and elastically deformable material, and is made of urethane rubber, which is a synthetic rubber here.

The substrate 25 is formed in a container shape having a circular top plate 25a and side surfaces 25b extending down along the periphery of the top plate 25a. An insertion hole 29 for exposing the upper end of the gear unit 5 to the upper surface of the substrate 25 is formed in the top plate 25a.

The peripheral wall 27 is formed of a sheet material made of urethane rubber and provided along the periphery of the substrate 25 . Specifically, it is fixed by adhesion while being wrapped around the side surface 25 b of the substrate 25 .
A notch portion 27a exposing a part of the blade portion 7a of the cutting blade 7 to the outside of the peripheral wall 27 is formed by gradually decreasing the height of the peripheral wall 27 from the operation rod 3 side toward the front side. . In other words, the peripheral wall 27 has a shape in which the height covering the side surface of the cutting blade 7 increases from the side where the blade portion 7a of the cutting blade 7 is exposed toward the operation rod 3 side.
In addition, the peripheral wall 27 has a shape extending downward from the lowermost end of the configuration for supporting the cutting blade 7 toward the operation rod 3, that is, the lower end of the nut cover 71 in FIG.

As shown in FIG. 1, the fixing means 19 includes a metal base plate 35 fixed to the upper surface of the top plate 25a of the substrate 25 via a rubber bottom plate 31 with a plurality of fastening members 33 using bolts and nuts. a splint member 37 fixed to the upper surface of the plate with a fastening member 33;
By fixing the base plate 35 to the top plate 25a of the substrate 25 via the rubber floor plate 31, the metal members can be closely fixed without gaps, and vibration noise and the like due to loosening over time can be suppressed.

The splinting member 37 has an inclined portion 37a which is formed by cutting a metal square pipe material in accordance with the inclination of the operation rod 3, and a pair of bolt insertion holes 37b are formed on both side surfaces of the splinting member 37, respectively. It is The rear end of the abutment member 37 is sealed with a cap 41 made of plastic.

The clamper 39 has a pair of clamp pieces 45, 45 whose upper ends are rotatably connected to the shaft pin 43. Each clamp piece 45 has an arc portion 45a fitted to the outer peripheral surface of the operating rod 3, and a fixing portion 45b. A bolt insertion hole 45c corresponding to the bolt insertion hole 37b of the support member 37 is formed in each fixing portion 45b.
Before the anti-scattering cover 9 is attached to the operation rod 3, the clamper 39 is temporarily fixed to the support member 37 by the fastening member 47 consisting of the bolt 47a, the washer 47b, and the nut 47c. That is, the clamp pieces 45, 45 are attached without being tightened by the bolt 47a.

Based on FIG. 2, the attachment operation of the scattering prevention cover 9 to the operating rod 3 and the configuration of the gear unit 5 will be described. 2 and 4, the cross-sectional representation is partially omitted.
The gear unit 5 integrally having the cutting blade 7 is inserted into the insertion hole 29 from the lower surface side of the substrate 25 so that the upper portion thereof is exposed on the upper surface side of the substrate 25 . In this state, the distal end portion 3 a of the operation rod 3 is passed through the clamper 39 in the temporarily fixed state, and the clamper 39 is tightened by the fastening member 47 while the drive shaft 21 is connected to the gear unit 5 .
As a result, the scattering prevention cover 9 is fixed in a stable state so that the inclined portion 37a of the splicing member 37 is along the outer surface of the tip portion 3a of the operating rod 3. As shown in FIG.

The gear unit 5 has an operation rod connecting portion 49 into which the tip portion 3 a of the operation rod 3 is inserted, and a cutting blade support portion 51 .
A bevel gear 53 having a connecting hole 53 a to which the tip of the driving shaft 21 arranged in the operating rod 3 is connected is rotatably supported by the operating rod connecting portion 49 with a bearing 55 . The cutting blade support portion 51 is provided with a vertically extending rotating shaft 57 that supports the cutting blade 7 and a bevel gear 59 that is fixed to the upper end of the rotating shaft 57 and meshes with the bevel gear 53 . It is rotatably supported at 63.
The meshing structure of the bevel gear 53 and the bevel gear 59 converts the orientation of the axis of the drive shaft 21 rotated by the engine 11 to vertical, so that the rotating shaft 57 rotates horizontally.

A blade receiving metal fitting 65 is fixed to the rotating shaft 57 . A nut 69 screwed to the part is tightened and fixed via a metal nut cover 71 .
The blade receiving metal fitting 65 , the blade pressing metal fitting 67 , the cutting blade 7 , the nut 69 and the nut cover 71 rotate together with the rotating shaft 57 .
When the operator W moves the mower 1, the cutting blade 7 moves while the nut cover 71 slides on the ground. In other words, the cutting blade 7 moves while being lifted from the ground by the height of the nut cover 71 . FIG. 2 shows an unused state in which the anti-scattering cover 9 is lifted from the ground.

FIG. 3 shows the anti-scattering cover 9 viewed from below, and the fixing means 19 and the like are omitted.
The gear unit 5 is arranged so that the cutting blade 7 is shifted leftward in the figure with respect to the substrate 25 . Specifically, the cutting edge of the blade portion 7a of the cutting blade 7 is arranged so as to protrude from the outer peripheral end of the peripheral wall 27 by the dimension d. The dimension d is, for example, approximately 15 mm to 20 mm.
In FIG. 3, reference M indicates the direction of rotation of the cutting blade 7. As shown in FIG.

As shown in FIG. 4, when the scattering prevention cover 9 is lowered so that the nut cover 71 contacts the ground G in order to start the mowing operation, the flexible peripheral wall 27 bends and the cutting blade is placed between the ground G and the cutting blade. A closed space 73 that surrounds the cutting blade 7 is formed with only the front side of the cutting blade 7 slightly opened, and cutting proceeds by rotating the cutting blade 7 in this state.
Weeds P1 of weeds P cut by the cutting blade 7, pebbles S hitting the cutting blade 7, and the like scatter randomly over the entire circumference of the cutting blade 7 at high speed due to centrifugal force. Stops scattering all around.
Therefore, it is possible to highly accurately suppress the scattering of the weeds P1 and the like, and it is possible to prevent hard objects such as the pebbles S from scattering to the surroundings, thereby enhancing the safety. Since there is no need to pay attention to the scattering of hard objects such as pebbles S, the burden on the operator can be reduced.

When hard objects such as pebbles S collide with the metal surface compared to the grass scraps P1, etc., a loud collision sound is generated when it hits the metal surface, and noise is likely to occur in the vicinity of the work area. can.
In addition, even if the ground at the work site is uneven, the peripheral wall 27 having flexibility can be deformed to follow the unevenness, so that the cutting blade 7 moves smoothly.

As described above, according to the shatterproof cover 9 according to the present embodiment, it is possible to ensure sufficient mounting strength of the shatterproof cover 9 to the operating rod 3 due to the presence of the base plate 25 made of a hard material, and the flexibility is improved. The shatterproof function can be enhanced by the sealing property of the cover body 23 provided with the peripheral wall 27 having the Safety can be enhanced by preventing scattering of hard objects such as pebbles S, and noise can be prevented by the peripheral wall 27 having flexibility.
In addition, since the scattering prevention cover 9 is detachably fixed to the operation rod 3 by the fixing means 19 having a clamper structure, replacement of the scattering prevention cover 9 when the peripheral wall 27 is worn or damaged over time becomes easy. .

Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment. included.
For example, the material of the substrate 25 in the anti-scatter cover 9 is not limited to the above, and a hard material other than metal may be used as long as the same mounting strength to the operating rod 3 can be obtained.
The material of the peripheral wall 27 is also not limited to the above, and it may be formed of synthetic rubber other than urethane rubber or a flexible synthetic resin sheet material.

In the above embodiment, the mower 1 is provided with the gear unit 5 at the tip of the operating rod 3 and the engine 11 is provided at the rear end. A lawn mower provided with an electric motor and a battery pack of .
Further, as described in Patent Document 2, for example, an electric motor is provided at the tip of the operating rod 3, a cutting blade is fixed to the rotating shaft thereof, and a battery pack is provided at the rear end of the operating rod. It can also be implemented in the same way in a lawn mower that is in use.
Also, it can be carried out in the same way with a mower equipped with a nylon cutter, a cord cutter, or the like.
Also, the anti-scattering cover according to the present invention can be similarly implemented in what is called a brush cutter.

DESCRIPTION OF SYMBOLS 1... Grass cutter 3... Operation stick 3a... Tip part 5... Gear unit 7... Cutting blade 7a... Blade part 9... Scattering prevention cover 11... Engine (driving source)
DESCRIPTION OF SYMBOLS 13... Handle 15... Throttle lever 19... Fixing means 21... Drive shaft 23... Cover main body 25... Base plate 27... Peripheral wall 27a... Notch part 29... Insertion hole 35... Base plate 37... Splicing member 39... Clamper

Claims (5)

A cutting blade rotatably supported at the tip of an operating rod is rotated by a drive source integrally provided with the operating rod, and the blade portion provided on the cutting blade comes into contact with the object to be cut to cut the object. A scattering prevention cover used for a lawn mower,
a substrate covering the upper surface side of the cutting blade; a cover body provided on the substrate and having a peripheral wall covering the rear surface side and the left and right side surfaces of the cutting blade and having an open lower surface; and a fixing means for fixing the cover main body to the operating rod in a state in which a part of the cutting edge of the cutting blade is exposed from the cutout. Shatterproof cover. In the anti-scattering cover according to claim 1,
A shatterproof cover, wherein the substrate is made of a rigid material, and the peripheral wall is made of a flexible and elastically deformable material. In the anti-scattering cover according to claim 1 or 2,
The scattering prevention cover, wherein the notch portion is formed by gradually decreasing the height of the peripheral wall. In the anti-scattering cover according to claim 2 or 3,
A shatterproof cover, wherein the substrate is made of metal and the peripheral wall is made of synthetic rubber. A cutting blade rotatably supported by the tip of an operating rod is rotated by a drive source integrally provided with the operating rod, and the cutting edge provided on the cutting blade comes into contact with the object to be cut for cutting. and a scattering prevention cover fixed to the operation rod,
A lawn mower, wherein the anti-scattering cover is the anti-scattering cover according to any one of claims 1 to 4.

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