Patent ID: 6515245
Filing Date: 2003-02-04
Classification: H01H

Abstract:
A closing assistance mechanism for an electrical switchgear apparatus, comprising:a switching shaft movable in rotation in a closing direction from an open position to a closed position, and in an opening direction opposite to the closing direction, from the closed position to the open position; a closing assistance spring movable between an unloaded position and a loaded position; a loading shaft movable in rotation in a loading direction; loading means associated to the loading shaft to drive the closing assistance spring from the unloaded position to the loaded position when the loading shaft rotates in the loading direction to a ready to close position and to release the closing assistance spring when the loading shaft goes beyond the ready to close position in the loading direction; transmission and coupling means comprising: a driving coupling means in permanent kinematic connection with the closing assistance spring, a driven coupling means securedly affixed to the switching shaft, the driven coupling means following a rotary trajectory in the closing direction when the switching shaft moves from the open position to the closed position, and in the opening direction when the switching shaft moves from the closed position to the open position; a return means of the driving coupling means; the transmission and coupling means being such that: when the switching shaft is in the open position and the closing assistance spring is in the loaded position, the driving coupling means is in a load take-up position, engaged with the driven coupling means; when the closing assistance spring moves from the loaded position to the unloaded position, the driving coupling means drives the driven coupling means to an intermediate uncoupled position, and the switching shaft moves from the open position to an intermediate uncoupled position in the closing direction; when the switching shaft moves from the uncoupled position to the closed position in the closing direction, the driving coupling means is driven to a withdrawn position by the return means and the driven coupling means is uncoupled from the driving coupling means; when the closing assistance spring moves from the unloaded position to the loaded position, the driving coupling means moves from the withdrawn position to the load take-up position following a trajectory not interfering with the rotary trajectory of the driven coupling means.