JPS6131970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cutter attachment shaft support device for a brush cutter, in which a support portion for supporting the cutter attachment shaft of a brush cutter is provided by enlarging and molding one end of an outer pipe curved downward. This is related to.

Conventionally, the support portion of the cutter attachment shaft of a brush cutter has been formed by casting separately from the outer pipe, as shown in FIG. That is, 1 is a cutter of a brush cutter, which is formed into a disc having a blade portion (not shown) around the periphery. Reference numeral 3 denotes a pedestal that fits into a spline 7 provided on the circumference of the cutter mounting shaft 5, 9 a washer that fits into the spline 7, and the cutter 1 is held between the pedestal 3 and fixed with a nut 11. 13
1 is a support part made of cast metal, which fits into the end of an outer pipe 15 connected to an engine (not shown), and pivotally supports the cutter mounting shaft 5 through bearings 17, 17 inside. 19 is bearing 1
Snap springs 7 and 17 are engaged, and 21 is a bolt that fixes the support portion 13 to the outer pipe 15. Reference numeral 23 denotes a transmission shaft made of a flexible material, the other end of which is connected to an engine (not shown) to transmit power. A flexible outer cylinder 25 fits into the outer pipe 15, surrounds the coil 27, is filled with a flexible material such as synthetic resin, and fits and supports the transmission shaft 23 inside. A square shaft 29 is fixed to the tip of the transmission shaft 23 and is fitted into a square hole 31 formed at the end of the cutter attachment shaft 5. Therefore, in the past, processing and assembly were difficult, making it impossible to reduce manufacturing costs, and furthermore, the bearing 17 was attached to the support part 1.
Since the snap spring 19 is used to lock the bush cutter to the bush cutter, the lock is not perfect, and if it comes loose, there is a risk of a serious accident, creating a safety concern for the brush cutter.

The present invention provides a support section that is formed by enlarging the end of an outer pipe that is curved downward, and a bearing that is fitted into this support section is locked by bending the edge of the support section toward the center. The cutter mounting shaft is fitted to this bearing, and the transmission shaft passing through the outer pipe is engaged with the cutter mounting shaft to facilitate processing and assembly. To provide a cutter mounting shaft support device for a brush cutter that can be manufactured at low cost and that can securely engage bearings to safely perform brush cutting work. Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

In Fig. 2, 41 is the cutter of the brush cutter;
It is formed into a disc shape with a blade (not shown) around the periphery. Reference numeral 43 denotes a pedestal that fits into a spline 47 provided on the circumference of the cutter mounting shaft 45; 49 a washer that fits into the spline 47; the cutter 41 is held between the pedestal 43 and fixed with a nut 51; Reference numeral 53 denotes a support part provided at the end of the outer pipe 55 connected to the engine (not shown), which is formed by enlarging the inner diameter part of the end of the outer pipe 55 that curves downward by rolling pressure processing or the like. A cutter mounting shaft 45 is pivotally supported on the enlarged inner diameter portion via bearings 57, 57. After the bearings 57, 57 are inserted, the end portions of the support portions 53 are bent toward the center by rolling pressure processing or the like to form locking portions 59 to lock the movement of the bearings 57, 57. Reference numeral 61 denotes a power transmission shaft made of a flexible material, which passes through the outer pipe 55 and is connected to the engine (not shown) at the other end to transmit power from the engine to the cutter 4.
Transmitted to 1. Reference numeral 63 denotes a flexible outer cylinder that fits into the outer pipe 55, and is provided so as to surround the coil 65 with a flexible material such as synthetic resin, and fits and supports the transmission shaft 61 therein. 67 is the transmission shaft 6
The cutter mounting shaft 45 is a square shaft that is fixed to the tip of 1.
It fits into a square hole 69 provided at the end. Reference numeral 71 denotes a locking plate fitted and supported within the support portion 53 between the bearing 57 and locks the end of the flexible outer cylinder 63.

In the above configuration, the transmission shaft 61 is rotated by the drive of the engine (not shown), and the cutter 41 is rotated through the square shaft 67, the square hole 69, and the cutter mounting shaft 45.
The blade rotates to perform the mowing work.

FIG. 3 shows another embodiment, in which the inner diameter of an outer pipe 55 provided separately from the outer pipe 73 is enlarged to form a support portion 53, which is fixed to the outer pipe 73. Note that the same reference numerals as those shown in FIG. 2 represent the same components.

As described above, since the present invention has the configuration as described in the claims, it eliminates cast parts that require high material costs and large processing man-hours, uses pipes that have low material costs, and improves work efficiency such as compaction processing. It is easy to process and assemble using a good processing method, and can be manufactured at low cost. In addition, since the bearing can be reliably locked in the support part, it is possible to prevent a serious accident such as the rotating cutter slipping out during the cutting operation.

That is, the effects of the present invention are listed below.

(1) It is possible to simultaneously hold the bearing that supports the rotation of the cutter and take out the rotary shaft for driving the cutter.

(2) During assembly work, there was a risk that the separate support would come out along with the cutter due to the inevitable swinging of the long pipe, but when the method of the present invention is adopted, there is no such risk. thing.

(3) If the rotary shaft for driving the cutter is made flexible, the angle can be easily changed by bending the pipe together with the shaft, eliminating the need for gears at all.

Note that the present invention is not limited to the above-described embodiments, and the present invention can be implemented in modes other than the above-described embodiments.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side sectional view of a conventional cutter attachment shaft support device, FIG. 2 is an explanatory side sectional view of one embodiment of the present invention, and FIG. 3 is an explanatory side sectional view of another embodiment. Explanation of symbols representing main parts of the drawings, 45...
... Cutter mounting shaft, 53 ... Support part, 55 ... Outer pipe, 57 ... Bearing, 59 ... Locking part, 61 ... Transmission shaft, 67 ... Square shaft, 69 ...
Square hole.

Claims (1)

[Claims] 1 A support part 53 is provided, which is formed by enlarging one end of an outer pipe 55 whose other end is connected to the engine and curved downward, and the bearings 57, 57 fitted into the inner diameter part of the support part 53 are A locking portion 59 formed by bending the edge of the portion 53 toward the center
The cutter mounting shaft 45 fitted into the inner diameter portion of the bearings 57, 57 is fixed in the axial direction by a cutter mounting shaft 45, and the cutter mounting shaft 45 is fixed in the axial direction, and the cutter mounting shaft 45 is opened at the inner end surface of the cutter mounting shaft 45. A cutter attachment shaft support device for a brush cutter, characterized in that a square shaft 67 at the tip of a transmission shaft 61 passing through an outer pipe 55 is engaged with a square hole 69.