Mechanism for transmitting motion through a sealed wall

Claim 1

IN A MECHANISM FOR USE IN CONNECTION WITH A SEALED WALL, A TORSION SHAFT EXTENDING THROUGH AN OPENING IN THE WALL, BEARING MEANS SURROUNDING AND JOURNALLING THE TORSION SHAFT AND FORMING PART OF THE SEALED WALL, A POLYFLUOROETHYLENE PLASTIC TUBE SURROUNDING THE BEARING MEANS AT ONE END AND THEN SURROUNDING THE TORSION SHAFT TOWARD THE OTHER END, THE BEARING MEANS HAVING A TAPERED END INSIDE THE TUBE WITH WHICH TAPERED END THE TUBE IS IN CONTACT, SAID TAPERES END REDUCING THE STRESS CONCENTRATION ON THE TUBE, SAID TUBE UNDER PRESSURE BEING IN CONTACT WITH THE PORTION OF THE BEARING MEANS WHICH IT SURROUNDS AND WITH THE PORTION OF THE TORSION SHAFT WHICH IT SURROUNDS BEYOND THE BEARING MEANS, MEANS FOR SECURING THE TUBE AT ONE END TO THE BEARING MEANS AND MEANS FOR SECURING THE TUBE AT THE OTHER END TO THE TORSION SHAFT, AN ARM ATTACHED SUBSTANTIALLY PERPENDICULARLY TO THE AXIS OF ROTATION OF THE TORSION SHAFT, SAID ARM COMPRISING A HELICAL SPRING WOUND WITH AN INITIAL TENSION BETWEEN TURNS, A SENSING ELEMENT LOCATED ON THE ARM REMOTE FROM THE SHAFT, SAID ELEMENT UPON ACTIVATION CREATING ANGULAR MOVEMENT OF THE ARM AND AXIAL ROTATION OF THE SHAFT AND INDICATOR MEANS OPERATIVELY CONNECTED TO THE TORSION SHAFT OUTSIDE THE SEALED WALL.