JPS606177Y2 - Brush cutter blade locking mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cutting blade locking mechanism for a cutting blade attaching/detaching section in a brush cutter.

Brush cutters usually have a cutting blade locking mechanism in the cutting blade attachment/detachment section, but there are systems that use special spanners or straight bars as the locking mechanism, but it is necessary to support them by hand when attaching and detaching the cutting blade. It has the following drawbacks.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a cutting blade locking mechanism that allows easy attachment and detachment of the cutting blade.

The present invention focuses on the bending springiness of the metal bar, and devises the shape of the bar so that the cutting blade can be attached and detached even if the locking device is removed.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the shape of a general brush cutter that includes a power source 1, a main rod 2, a cutting blade 3, a handle 4, an accelerator lever 5, and a gear box 6.

2 and 3 show the cutting blade locking mechanism according to the present invention.

The power from the power source 1 is transferred to the transmission shaft 8, spindle 7, and key 1.
4. It is transmitted to the cutting blade 10 via the upper cutting blade seat 9.

This cutting blade 1o is tightened and fixed by a nut 12 via a lower cutting blade seat 11.

The lock bar 13 is made of a metal round bar and has a U-shape with inward hooks 17 facing each other at the tips, as shown in FIG.
Due to the bending elasticity of metal, the hook portion 17 is made into a deformable shape like 13B.

On the other hand, a lock bar insertion hole 1 is provided in the outer cylindrical portion 18 of the cutting blade seat 9.
6 are provided at symmetrical positions with respect to the center of rotation, and two gear box lock bar insertion holes 15 are also provided in the gear box 6 so as to communicate with the lock bar insertion holes 16.

Deform the lock par 13 by hand like 13B, insert it into the lock bar insertion holes 15 and 16, and release the lock par 1.
The deformation of 3 is restored and the lock par 13 is inserted into the lock bar insertion hole 1.
It remains inserted in 5.16.

That is, since the cutting blade seat 9 and the gear box 6 are prevented from rotating, the nut 12 can be tightened or loosened using both hands.

According to the present invention, when the lock par 13 is deformed by hand and inserted into the lock bar insertion holes 15, 16 and then released, it remains inserted into the lock bar insertion holes 15, 16 due to the springiness of its own material. The blade receiving seat 9 and the gear box 6 can be prevented from rotating, and the lockper will not come off when tightening or loosening the nut 12.

Therefore, since the nut can be tightened or loosened with both hands, the tightening and loosening operations can be performed easily and reliably.

Furthermore, compared to conventional spanner-type locking mechanisms, it has various practical benefits such as being lighter and cheaper.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the general structure of a brush cutter, Fig. 2 is a vertical cross-sectional view of the cutting blade a-tsuck mechanism of the present invention and its surroundings, and Fig. 3
The figure is a sectional view taken along line A in FIG. 2. In the figure, 1 is the power source, 2 is the main rod, 3 is the cutting blade, 4 is the handle, 5 is the accelerator lever, 16 is the gear box, 7 is the spindle, 8 is the transmission shaft, 9 is the upper cutting blade seat, 10 is the cutting blade, 11 is the lower cutting blade seat, 12 is the nut, 13 is the lock bar, 14 is the key, 15.16 is the lock bar insertion hole, 1
7 is the hook part.

Claims (1)

[Scope of utility model registration request] A slender main rod has a power source at one end and a cutting blade rotated by a spindle and a transmission shaft passing through the main rod at the other end, and the cutting blade is sandwiched between upper and lower cutting blade seats. In a brush cutter in which a nut is screwed onto a screw provided at the tip of a spindle to fasten a cutting blade through a lower cutting blade receiver, a U-shaped lockper having spring properties and an inward hook portion at the tip; A cutting blade locking mechanism comprising a cutting blade seat and two lock bar insertion holes provided facing the gear box and located symmetrically with respect to the center of rotation.