| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vibration sensor that has a simple structure and is low in cost. SOLUTION: This sensor has a case body 1, an arm part 2, which is extending from the inner surface of a side wall of the case body 1, a sphere 4, which is mounted on a spherical-surface concave part 3 so that the sphere drops at the time of vibration, a string-shaped body 5, whose one end part is attached to the sphere 4, and which is inserted into the ceiling wall part of the case body 1 located on the vertical line passing the center of gravity of the sphere 4 mounted on the sphere concave part 5 so that the other end part is guided to the outside and a switching means 8, which is provided at the falling part of the sphere 4. Furthermore, the switching means 8 has a first electrode 9, an electrode supporting member, which is arranged at the upper position of the electrode 9 so that member can be made to approach to or separated from the electrode 9, and to which a second electrode 13 in contact with the electrode 9 at the approaching time is attached, and an energizing member 14, which energizes the supporting member 11 to the side separating the supporting member 11 from the electrode 9. When the sphere 4 is dropped on the supporting member 11, the supporting member 11 approaches the electrode 9 against the energizing force of the energizing member 14. Thus, the electrode 13 comes into contact with the electrode 9.</p> |
