JP2008072930A - Bush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bush cutter that, while having a simple mechanism and constitution, is safe and with a protective cover, preventing accidents due to knocking over of empty bottles, empty cans, small stones or the like which collide with the cutting blade rotating at a high speed, or injuries or fatal accidents due to their contact with the persons nearby, and damages to the cutting blade by contact with obstacles, and which can also easily change the cutting blade. <P>SOLUTION: The bush cutter cutting grass leaves with a blade rotating at a high speed is provided, wherein a disk-like protective cover 2, having a somewhat larger diameter than a cutting blade 7 and formed of dents on a periphery 13, is attached on a driving shaft 6 in a cutting blade unit housing 5 through a bearing 10 fixed and integrated with a lower nipping element 8 of the freely removable cutting blade 7 so as not to synchronously rotate the disk-like cover 2 with the driving shaft, where the protective cover 2 is stopped or rotated at a low speed, when the cutting blade 7 is rotated at a high speed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention is attached to the cutting blade portion of a brush cutter to prevent the risk of injury and death accidents that come into contact with workers and surrounding people due to the high-speed rotation of the cutting blade and the rebound of empty bottles, empty cans, pebbles, etc. It is related with the brush cutter which attached the disk-shaped protective cover for this.

A conventional electric or prime mower has a general configuration in which a scattering prevention plate is attached to the main ridge of 20 to 30 cm above the cutting blade unit housing and no safety cover for the cutting blade is attached. .

In such a brush cutter, the cutting blade is exposed, so it is not safe and extremely dangerous. Because of the high speed rotation of the cutting blade, there is no end to scattering accidents such as empty bottles, empty cans and pebbles rebounding, personal injury such as cutting of hands and feet, and property damage accidents such as standing trees and poles. Recently, a protection cover is provided in the vicinity to prevent such damage, property damage and accidents.

The present invention is proposed in view of such a situation, and the inner ring of the bearing is fixedly integrated with the cutting blade clamping member on the lower surface ground side of the cutting blade, and a disk-shaped protective cover is provided on the outer ring of the bearing. In addition, a disk-shaped protective cover that does not rotate synchronously with the high-speed rotation of the drive shaft inside the cutting blade unit housing can be obtained by fixing and integrating them.
JP H09-220011 public information JP 2001-333616 A JP 2001-54308 A

The present invention has been made in order to solve such conventional problems, and the object of the present invention is to directly connect the cutting blades with pebbles and obstacles while ensuring the same safety as the above-described patent document invention. The configuration is such that the cutting blade itself is not damaged because it does not collide, and the structure is simple and can be manufactured at low cost, the cutting function is not impaired, and a highly durable brush cutter is provided. .

Accordingly, the present invention has been made to solve the above-described problems, and the invention according to the first claim is a disk-shaped protection in which a concave portion is formed in the outer edge portion with a slightly larger diameter than the cutting blade. The disk-shaped protective cover does not rotate synchronously with the drive shaft by attaching the cover to the drive shaft inside the blade unit housing through a bearing that is detachable with screws and fixedly integrated with the lower clamping member of the blade. The protective cover stops or rotates at a low speed while the cutting blade rotates at a high speed to prevent the obstacles from contacting the cutting blade in the entire circumferential direction and eliminate empty bottles, empty cans, pebbles, etc. It is configured.

The invention according to a second claim is the invention according to the first claim, wherein the tip of the convex portion of the outer edge portion of the disk-shaped protective cover is further projected and extended, and the extension is folded upward, and the cutting blade By forming a slowly rotating wall around the outer periphery of the blade, contact with obstacles around the cutting blade is prevented, and the effect of eliminating empty bottles, empty cans, pebbles, etc. is further enhanced.

  The rotation of the disc-shaped protective cover is separated from the high-speed rotation of the cutting blade and the drive shaft, and is configured so as not to rotate synchronously. The cutting blade can be contacted with the obstacle around the blade and empty bottles, cans, pebbles, etc. can be removed more effectively, preventing injury accidents to workers and nearby people, and the cutting blade itself is also an obstacle Because it does not collide at high speed, damage can be prevented.

  The protection device has a disk shape and is easy to install on the brush cutter. The construction is simple and simple, so the cost of producing the protective cover is low, the safety of the brush cutting work is secured, and the cutting blade itself can be replaced. Since it can be simplified, it is possible to reduce the cost of the brush cutter with protective device and the brush cutting work.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The brush cutter 1 can be carried by an operator who performs mowing work, and can rotate the cutting blade 7 at high speed by, for example, an engine that rotates and cuts grass and lawn with the cutting blade 7 that rotates at high speed. It is something that can be done. 1 and 2 are drawings showing a disk-shaped protective cover 2 provided between the cutting blade 7 provided on the brush cutter 1 and the ground below the cutting blade 7.

  As shown in FIG. 1, the disk-shaped protective cover 2 is disposed inside the cutting blade unit housing 5 that is rotationally driven by a driving force from an engine obtained through a drive shaft 4 that is rotatably inserted into the operation main shaft 3. A disk-shaped protection that is fixedly and integrally attached to a drive cover 6 and a bearing cover 12 fixed to an outer ring 11 of the bearing 10 via a bearing 10 in which a lower clamping member 8 and an inner ring 9 are integrally fixed. The cover 2 has a configuration in which the rotational force is cut off by the bearing 10 from the cutting blade 7 that rotates at a high speed together with the drive shaft 6 and does not rotate synchronously.

  The outer diameter of the disk-shaped protective cover 2 according to claim 1 is slightly larger than the outer diameter of the cutting blade 7, a recess 14 is provided in the outer edge portion 13, an empty bottle, an empty can, The configuration is such that pebbles or the like are removed or the cutting blade does not directly contact the obstacle.

  The convex part of the outer edge part 13 of the disk-shaped protective cover 2 according to claim 1 is further extended and protruded, and the extended part is folded upward to form a rising wall 15, and an empty can or pebbles in the outer peripheral direction of the cutting blade 7 or the like The structure according to claim 2, which functions to prevent the blade from entering around the cutting blade.

  When the cutting blade 7 of the brush cutter 1 is replaced, the fixing bolt 16 of the lower clamping member 8 fixed integrally with the disc-shaped protective cover 2 and the bearing 10 is loosened and removed, the cutting blade 7 is replaced, and again. The lower clamping member 8 and the integrated disc-shaped protective cover 2 are also replaced by simply setting the lower clamping member 8 and tightening the fixing bolts 16 of the lower clamping member 8 again in the same manner as a widely used brush cutter. It is set as the structure which can do easily.

  As described above, the brush cutter according to the present invention has, for example, a high-speed rotating part including a cutting blade that jumps away empty bottles, empty cans, pebbles, etc. in the work place during mowing, or an obstacle or a person nearby. Cutting, such as preventing injury to the body and death, preventing the cutting blade from colliding with an obstacle and causing the blade to spill or break, preventing the impact of the cutting blade against the ground and harsh contact noise. Both can be solved by this rotatable disc-shaped protective cover provided between the lower blade side and the ground.

Sectional drawing which shows the structure of this invention brush cutter. The front view of the AA direction which FIG. 1 of this invention brush cutter shows.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brush cutter 2 Disc-shaped protective cover 3 Operation main shaft 4 Drive shaft 5 Cutting blade unit housing 6 Drive shaft 7 Cutting blade 8 Lower clamping member 9 Inner ring of bearing 10 10 Bearing 11 Outer ring of bearing 12 Bearing cover 13 Disc-shaped protection The outer edge portion of the cover 14 The concave portion provided at the outer edge portion of the disk-shaped protective cover 15 The wall provided at the outer edge portion of the disk-shaped protective cover 16 The lower clamping member fixing bolt 17 The upper clamping member

Claims (2)

The drive shaft in the cutting blade unit housing that is driven to rotate by the driving force from the engine that is obtained through the drive shaft that is rotatably inserted into the operation main shaft, and the drive shaft is a cutting blade that can be removed by screws. By attaching a disc-shaped protective cover via a bearing that is fixedly integrated with the lower clamping member, the rotational force of the drive shaft is cut off, and the outer diameter is slightly larger than that of the cutting blade, and there are multiple recesses on the outer edge. This is a brush cutter with a protective cover that prevents the bouncing of empty bottles, empty cans, pebbles, etc. and personal injury caused by high-speed rotation of the cutting blade, which is arranged so as to cover the disk-shaped protective cover formed from the lower ground side of the cutting blade. A brush cutter configured so that the disk-shaped protective cover does not rotate synchronously with the drive shaft and the cutting blade. In Claim 1, the front-end | tip part which protruded on the convex part side of the outer edge part of a disk-shaped protective cover is extended further, and the extension part is folded up so that the outer edge part of a cutting blade may be covered, By forming a wall that rotates slowly, the function of preventing the bouncing of empty bottles, empty cans, pebbles, etc. due to the high-speed rotation of the cutting blades and the injury accident to the operator of the brush cutter or nearby persons is further enhanced. Brush cutter.

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