| 摘要 |
PROBLEM TO BE SOLVED: To have a simple structure strong in vibration and surely operate as a gradient switch by providing a sphere having a prescribed weight, a sphere receiver having a gradient surface for mounting the sphere on its inside, and a sphere self-reset switch which is positioned in the bottom end part of the gradient surface and in a conductive state while being press by the sphere. SOLUTION: In a steel sphere receiver 9 which has a truly spherical steel sphere 7 having a prescribed weight, for example, the diameter 50 mm and the weight approximately 540 g mounted thereon and a conical gradient surface 8 on its inside, the inner gradient surface 8 is formed into an inverse conical shape with the downward angleθof 30 deg. to the horizontal plane. Therefore, when a plane body is inclined and the steel sphere 7 mounted on the gradient surface 8 is inclined 30 deg. or more, an approximately 80 g reset force of a pushbutton 12a of a sphere self-reset switch 12 can push the steel sphere 7 in the horizontal direction so as to rotate it on the gradient surface 8 which is turned into a horizontal surface, release the pushing force of the pushing button 12a, and stop the motor.
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