Container having means for preventing escape of fluid therefrom where a shaft enters the same

Claim 1

IN A MECHANISM OF THE TYPE WHEREIN A DRIVEN ROTARY SHAFT EXTENDS THROUGH A WALL OF A CONTAINER AND OPERATES A DEVICE WITHIN THE SAME AND WHEREIN IT IS DESIRED TO PREVENT THE ESCAPE OF FLUID FROM WITHIN THE CONTAINER AT THE POINT OF ENTRY OF THE SHAFT, THE IMPROVEMENT COMPRISING A CUP SUPPORTED BY THE CONTAINER WALL AND HAVING AN OPEN TOP AND A BOTTOM THROUGH WHICH THE SHAFT EXTENDS AND PACKING MEANS BETWEEN THE SHAFT AND THE CONTAINER WALL CLOSING THE ANNULAR PORTION OF THE OPEN TOP AROUND THE SHAFT, A SECOND AND OPEN TOPPED LIQUID RECEIVER WITHIN THE CONTAINER, THE CUP AND RECEIVER COMMUNICATING ADJACENT THEIR BOTTOMS AND CONTROLLABLE MEANS ACCESSIBLE AT THE EXTERIOR OF THE CONTAINER FOR SUPPLYING INERT LIQUID TO AND EXHAUSTING AERIFORM FLUID FROM THE CUP TO PERMIT THE SAME TO BE FILLED WITH LIQUID TO PROVIDE A LIQUID BARRIER BETWEEN THE INTERIOR SPACES OF THE CONTAINER AND THE PACKING MEANS.