Patent ID: 7414209
Filing Date: 2008-08-19
Classification: H01H

Abstract:
1. A liquid level sensor switch, comprising a case, a rod type guide vertically extending upward from an inside bottom center of the case, a float having a center bore loosely inserting therein the guide, said float being movable up and down along the guide, an electrode plate attached to a bottom surface of the float, and a pair of fixed contacts disposed opposite to each other across the guide on the inside bottom surface of the case, wherein the float moves down with the drop of liquid in the case until reaching a specified lowest position at which the electrode plate makes contact with both the paired contacts to turn on a circuit formed by the electrode plate bridged between the paired contacts for detecting a specified low level of liquid, characterized in that the guide has a body tapered to be gradually smaller in diameter in cross section upward from its bottom end.