Patent ID: 9024712
Filing Date: 2015-05-05
Classification: H01H

Abstract:
1. A mechanical vibration switch, comprising: a bar pivotally attached to a reference structure; a magnet disposed on the bar, the magnet having a first surface with a first surface area; an inertial mass attached to the bar; a magnetic material part disposed in spaced apart relation to the magnet such that a magnetic force acts on the bar in a first direction, the magnetic material part having a second surface, the second surface having a second surface area, the second surface facing the first surface of the magnet when the bar contacts a stop; an electrical switch coupled to the bar such that the state of the switch changes from open to closed depending on the position of the bar; a spring acting on the bar to provide a force in a second direction opposite to the first direction; wherein the magnetic material part is adjustable between a first position where a first portion of the surface area S of the second surface is disposed in facing relation with a corresponding surface area S of the first surface to a second position where a second portion of the surface area S of the second surface is disposed in facing relation with a corresponding surface area S of the first surface while the distance d between the first surface and the second surface remains substantially constant; and, wherein the second portion of the surface area S of the second surface is larger than the first portion of the surface area S of the second surface.