Patent ID: 7064286

Claim:
A secure operation mechanism ( 10 , 10 ′) for an electrical shutdown device ( 1 , 1 ′) housed within a cabinet ( 4 ) which is closed by a door ( 5 ), the shutdown device ( 1 , 1 ′) being moveable between a disengaged position (0 position) and an engaged position (1 position) by shifting of a control shaft ( 6 , 6 ′) attached to a principal handle ( 7 ) mounted to the door ( 5 ) so as to be accessible from outside the cabinet ( 4 ) when the door ( 5 ) is closed: wherein the secure operation mechanism ( 10 , 10 ′) comprises a secondary handle ( 11 , 11 ′) attached to the control shaft ( 6 , 6 ′) so as to be accessible from inside the cabinet ( 4 ) in order to switch the shutdown device ( 1 , 1 ′) between the disengaged and the engaged positions (0 and 1 positions) when the door ( 5 ) is open, and a locking mechanism is attached to the control shaft ( 6 , 6 ′) and is positioned to be moveable between a locked position, in which the locking mechanism prevents switching of the shutdown device ( 1 , 1 ′) via movement the secondary handle ( 11 , 11 ′) when the door ( 5 ) is open, and an unlocked position, in which switching of the shutdown device ( 1 , 1 ′) is permitted via a pushing movement of the secondary handle ( 11 , 11 ′), when the door ( 5 ) is open, and via a corresponding pushing movement of the principal handle ( 7 ), when the door ( 5 ) closed.