JP2005176813A - Cutting blade-mounting device of bush cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems such that since a cutting blade is screwed from its reverse side in a cutting blade-mounting device of a conventional bush cutter, a work with an unstable posture by reverse-turning the bush cutter is required, and since a knack is required for handling an exclusive tool for a deep hole, it is inconvenient that some of the users such as a beginner or woman can not exchange the cutting blade, and also its working efficiency is reduced by that in cutting work of a soft and long weeds, the weeds coil around at the central part of the blade-mounting device. <P>SOLUTION: This bush cutter is provided by loading the cutting blade 1 by setting its center on a lower part holder set with a cutting blade bolt, penetrating an upper holder 2 and a hollow cutting blade shaft 5 as they are with the bolt and tightening a nut 7a or 7b at the tip end to nip/hold the cutting blade. Since the freedom around the nut 7a is large, anybody can surely tighten the cutting blade with an usual marketed tool. Also, since the cutting blade bolt is penetrated up to the upper part of a gear case, optional parts such as the nut 7b having an coiling-prevention knob, etc., can be applied as a development. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cutting blade mounting device for a brush cutter that makes it possible to easily and reliably replace a cutting blade with a commercially available tool and make it difficult for the cut grass to wind.

  In conventional machines, the cutting blade is attached by holding the upper and lower holders around the center circumference of the cutting blade, and using a left-hand screw bolt or nut with the special tool on the cutting blade shaft from the back side of the cutting blade, that is, from the ground side. The method of tightening is taken.

  In the conventional brush cutter method described above, a nut is attached for tightening to the ground side. At the initial stage of cutting blade replacement, the upper holder, cutting blade, It is necessary to tighten the left-hand screw nut while aligning the center of the holder, spring washer, and nut at the same time.

  In addition, since a lower holder with an outer peripheral part protruding from the height of the nut is used to prevent the nut from being worn away during work, a special deep hole tool is required to replace the cutting blade. It is difficult to use a commercially available spanner or the like, so it is difficult to grasp the sense of tightening torque.

  In addition, mud and pebbles get caught in the gap around the nut of the lower holder during work, and when removing the cutting blade, it must be removed beforehand with a thin screwdriver or the like, which is troublesome.

  In the conventional cutting blade mounting device for a brush cutter described above, due to the difficulty, the user himself / herself cannot be replaced by the user himself / herself.

  The present invention is intended to solve the problems of such a conventional brush cutter. Anyone can easily and surely replace the cutting blade with a commercially available tool and can perform the operation with peace of mind. The purpose is to provide a payment machine.

  In order to achieve the above object, the present invention has a lower holder in which the brush cutter is set in a stable normal posture with one hand set from the bottom, and the other hand holds the cutting blade on the other hand. The center is put together, passes through the hollow cutting blade shaft as it is from below, a nut is attached to the tip, tightened with a spanner or the like, and sandwiched between the upper holder and fixed to the hollow cutting blade shaft.

  The effect | action by the said solution is as follows. Since the center of the cutting blade is determined in advance in the lower holder and can be inserted into the hollow cutting blade shaft from the bottom in the same posture, the center does not shift in the middle.

    Furthermore, when tightening the hollow cutting blade shaft with a cutting blade bolt and nut, the degree of freedom around the nut is large, so that it can be fixed easily and reliably with a stable tightening torque with a commercially available tool. Even if the nut loosens and vibrates during operation, the cutting blade bolt penetrates the cutting blade shaft and cannot be removed immediately.

    As described above, the cutting blade mounting device of the present invention can provide a convenient and highly safe brush cutter that can be easily and surely replaced by a commercially available tool even for those who cannot.

  In addition, since the cutting blade bolt that rotates synchronously with the cutting blade penetrates the upper portion of the gear case body, an option for preventing soft grass that has been cut off from being wound around the gear case can be devised.

  Hereinafter, the present invention will be described with reference to FIG.

In the figure, 1 is a cutting blade, 2 is an upper holder, 3 is a lower holder, 4 is a cutting blade bolt, 5 is a hollow cutting blade shaft, 6 is a gear case, and 7a is a nut.
The cutting blade 1 is sandwiched between the lower holder 3 and the upper holder 2 and is fixed to the hollow cutting blade shaft 5 by a cutting blade bolt 4 and a nut 7a penetrating the hollow cutting blade shaft 5.

  Also, an option such as a nut with a knob such as 7b can be considered instead of the nut 7a, and the attachment of the cutting blade becomes easier, and 7b rotates synchronously with the cutting blade 1, so that the cut grass is a gear case. The effect which prevents winding to 6 is also acquired.

Sectional drawing of the cutting blade attachment apparatus for brush cutters which shows embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting blade 2 Upper holder 3 Lower holder 4 Cutting blade bolt 5 Hollow cutting blade shaft 6 Gear case 7a nut 7b Nut with knob

Claims (1)

  For brush cutters that employ a hollow shaft as the cutting blade shaft, penetrate the cutting blade bolt, and screw into the nut at the top of the gear case to fix the cutting blade to the hollow cutting blade shaft Cutting blade mounting device.

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