Self-leveling anti-disturbance device

Claim 1

A self-leveling anti-disturbance device comprising: a. a base member of electrically insulating material having a generally hemispherical recess formed therein, the surface of said recess being formed with a continuous serpentine raised rib extending entirely across said recess and having a relatively-narrow central channel along its entire length, the surface of said recess including said rib but excluding said channel being coated with electrically conducting material to form two separate conducting coatings isolated by said channel; b. an electrical conductor connected to each of said coatings for external connection therewith; c. a cover formed with a hemispherical protuberance disposed across and closing said base member to provide a hemispherical space therebetween; d. a sphere, having an electrically conducting coating, disposed in said space for translation therein; said channel having a width to permit said sphere to simultaneously coNtact both of said conducting coatings, and the portions of said surface adjacent to said channel being tapered upwardly toward said channel; whereby said sphere will initially assume a rest position in contact with only one of said coatings, and upon being disturbed said sphere will move across said rib and channel and momentarily short circuit said coatings.