PROBLEM TO BE SOLVED: To provide a rotary blade-fixing part of a bush cutter, capable of reducing labors and capable of protecting a threaded member for fixing a rotary blade. SOLUTION: This rotary blade-fixing part of the bush cutter is equipped with the threaded member for fixing the rotary blade removably on the tip of a drive shaft 3 which is rotationally driven in a specified direction, wherein a spherically convex part 12 integrally molded with the threaded member to be downward convex is positioned in an area under the center of the rotary blade 1 when used, so that its upper periphery approaches to the lower surface of the rotary blade and surrounds the threaded member. The threaded member integrally molded with the spherically convex part has an internal thread 25 which fits with an external thread 21 positioned on the tip of the drive shaft, or has another external thread which fits with another internal thread positioned on the tip of the drive shaft. The rotary blade-fixing part may have another blade which is outward extended from the spherically convex part and positioned under the rotary blade.

Testing device of sleep data* etc*

Rotary blade-fixing part of bush cutter

PURPOSE:To smoothly control the quantity of outflow, by keeping the cross-sectional area of a port small at the initial stage of retraction of a hydraulic cylinder and gradually opening the port to a prescribed degree. CONSTITUTION:When the hydraulic cylinder 6 is retracted, a control switch 30 is connected to a contact 34 to energize a solenoid 12 to shift a valve 13. At that time, a fluid flows out of the hydraulic cylinder 6 through an oil drain pipe 15 into a chamber 20 of a valve cylinder 23 wherein a balance piston 26 is fitted. As a result, the valve cylinder 23 is moved back despite the force of a second spring 28 and the port 22 is gradually opened. The elastic force of the second spring 28 is stronger than that of a first spring 27. The fluid flows out of the hydraulic cylinder 6 through the port 22 whose cross-sectional area is set small at the initial stage of retraction of the cylinder. The cross-sectional area of the port 22 is thereafter gradually increased. Thus, the cylinder is smoothly moved.

Testing device of sleep data* etc*

Citations

Rotary blade-fixing part of bush cutter

References

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