Patent ID: 6921989
Filing Date: 2005-07-26
Classification: H01H

Abstract:
1. A latching device used in an electrical switchgear, the latching device comprising: a shaft coupled to a contact of the switchgear and operable to move along a shaft axis between a first stable position in which an electrical path including the contact is closed and a second stable position in which an electrical path including the contact is open; a piston operable to move along a piston axis; a biasing device coupled to the piston to exert a biasing force on the piston along the piston axis; and a linkage coupling the piston to the shaft; wherein the linkage is configured such that the biasing force on the piston is transferred to the shaft to bias the shaft to one of the stable positions; wherein the biasing device exerts a biasing force on the piston that is transferred to the shaft when the shaft is in each of the stable positions.