Patent ID: 6706979
Filing Date: 2004-03-16
Classification: H01H

Abstract:
A vibration switch adapted to be in electric contact with a support, comprising:a housing adapted to be mounted on the support in an upright direction, and including an upper wall and a lower wall spaced apart from each other in the upright direction to confine an accommodation chamber; first and second electric contact bodies which are disposed in said accommodation chamber, and which respectively have first and second rolling surfaces that are spaced apart from each other along a centerline oriented in one of the upright direction and a longitudinal direction that is transverse to the upright direction, said first and second rolling surfaces respectively defining first and second farthermost areas which are spaced apart from each other by a first length along the centerline, and respectively defining first and second tangential areas which are offset from the centerline, said first and second tangential areas being spaced apart from each other by a distance that, when projected on a longitudinal line in the longitudinal direction, is equivalent to a second length; and first and second electrically conductive rollable bodies which are rollable on said first and second rolling surfaces about first and second rolling axes, respectively, and which respectively have first and second perimetrical areas that are in contact with the first and second rolling surfaces, respectively, and first and second widths, each of said first and second widths being defined by a distance that is between two diametrically opposite points in a respective one of said first and second perimetrical areas, sum of the first width and the second width being smaller than the first length and larger than the second length, such that when the support on which said housing is mounted stands still, said first and second electrically conductive rollable bodies are tangent to each other, and respectively abut against said first and second tangential areas by virtue of gravity to thereby establish electric contact between said first and second electric contact bodies, and such that once the support is caused to quiver in an unsteady state, said first and second electrically conductive rollable bodies will be caused to lurch towards one of said first and second farthermost areas so that one of said first and second electrically conductive rollable bodies is out of contact with a corresponding one of said first and second rolling surfaces which defines the other one of said first and second farthermost areas, thereby breaking the electric contact between said first and second electric contact bodies.