JPH023726Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is used to cut weeds, undergrowth, shrubs, etc. by attaching a disc-shaped cutting blade to the tip of a rod-shaped frame and rotating it with an engine. The present invention relates to a mounting device for a brush cutting blade in a power brush cutter.

In this type of brush cutter, as shown in the drawings, a head body 3 is provided at the tip of a frame 1 to which a brush cutter 2 is attached. The head body 3 is oriented vertically so that the cutting blade 2 is positioned parallel to the ground, and includes a frame 1 supported in an inclined direction and a power transmission mechanism at a predetermined angle. That is, a bevel gear 5 is provided at the tip of a drive shaft 4 that passes through the center of the frame 1, a bevel gear 7 is provided on a rotating shaft 6 in the head body 3 in the vertical direction, and the two are meshed. Installing the blade 2.

By the way, as shown in Fig. 2, conventional brush cutters have a male thread at the lower end of the rotating shaft, and a nut A.
Alternatively, the lower end of the rotary shaft is shaped like a flange, and the brush cutting blade 2 is fixed to the flange using a plurality of screws.

With conventional blades like this, nuts and screw heads protrude from the underside of the cutting blade 2, so this part can come into contact with the ground and break or fall off during work, and it is extremely dangerous because it rotates at high speed. In order to avoid this drawback, conventionally, a bowl-shaped protective cover B has been attached.

Further, in the conventional type, all the work of attaching the cutting blade had to be done from the bottom of the head body 3, in other words, the machine had to be turned upside down, which was an inconvenience.

In view of these points, the present invention prevents nuts or screw heads from protruding from the bottom of the cutting blade 2, and allows the cutting blade 2 to be tightened only from the top of the head body 3. A mounting device for the brush cutting blade that does not have the above-mentioned drawbacks has been devised so that it can be mounted easily and even if it becomes loose, it can be tightened from above very easily.

An embodiment of the brush cutting blade attachment device for the brush cutter of the present invention is shown in FIG.

Inside the casing 3a of the approximately Y-shaped head body 3, there is a drive shaft 4 connected to the drive shaft in the frame 1, and a rotation shaft 6 that is perpendicular to the drive shaft and makes a predetermined intersecting angle with the drive shaft 4, which are rotatable. Supported. A bevel gear 5 is fixed to the tip of the drive shaft 4, and a bevel gear 7 is fixed to the rotating shaft 6, and both the bevel gears 5 and 7 are meshed with each other. by the way,
The rotating shaft 6 on which the bevel gear 7 is fixed is shaped like a sleeve and is supported at a predetermined position inside the casing 3a, and the upper tightening rod 8 is inserted into the inside of the rotating shaft 6.

A rounded collar 9 is formed at the lower end of the upper tightening rod 8, and the upper end is a male thread 8a.

Thus, the upper tightening rod 8 can be freely inserted and removed from the lower end of the rotating shaft 6, and by setting the brush cutting blade 2 in the holder 10 and tightening the upper tightening rod 8 with the nut 11, the sleeve-shaped rotating shaft 6 can be removed. The upper tightening rod 8 is brought into close contact with the upper clamping rod 8, and the cutting blade 2 held between the holding plate 10a and the holder 10b can be held on the rotating shaft 6.

In other drawings, 3b is a cap of the casing 3a, 12 is a drive shaft and a bearing for a rotating shaft, and 13 is an oil seal.

According to the brush cutting blade attachment device of the brush cutter of the present invention, the brush cutting blade 2 can be attached by simply tightening the brush cutter from above the head body.
This makes it extremely easy to handle, and the screw head of the nut does not protrude from the underside of the cutting blade, so damage to the blade does not interfere with replacing the cutting blade. In addition, the protruding portion of the lower surface of the brush cutting blade can be made as small as possible, and the shape of the collar 9 can be made to be a slippery shape, making it most suitable for brush cutting work. can.

[Brief explanation of drawings]

The attached drawings are for explaining the brush cutting blade attachment device of the brush cutter of the present invention. Figure 1 is a vertical cross-sectional view of only the head portion of the brush cutter showing an embodiment of the present invention, and Figure 2 is a vertical sectional view of only the head body of the brush cutter according to the embodiment of the present invention. FIG. 2 is a side view of only a portion of an example of a brush cutter. 1...frame, 2...brush cutting blade, 3...head body,
4... Drive shaft, 5, 7... Bevel gear, 6...
Rotating shaft, 8... Tightening rod, 9... Tsuba, 8a... Male screw, 10a... Holding plate, 10b... Holder, 1
1...Natsuto.

Claims (1)

[Scope of utility model registration request] A brush cutter configured to transmit the rotational force of a drive shaft 4 connected to a prime mover to a rotating shaft 6 of a brush cutting blade 2 rotatably mounted on the lower surface of a head body 3 via a gear transmission mechanism. , the rotating shaft 6 is formed into a sleeve shape, and the center of the rotating shaft 6 has a
The upper tightening rod 8, which has a male screw 8a screwed on the upper end and a collar 9 formed on the lower end, is inserted, and the upper tightening rod is attached at the upper part by a nut 11 screwed onto the male screw 8a. , tighten, and form the head body 3 with the cutting blade 2 being tightly attached to the rotating shaft 6, and the cutting blade 2 being held between the holding plate 10a and the holder 10b at the lower end of the rotating shaft. A brush cutter attachment device for a brush cutter, characterized in that the brush cutter blade attachment device is rotatably and detachably fixed between the lower end surface of the casing 3a and the upper surface of the collar 9.