Patent ID: 8109519

Claim:
A tubular shaft seal assembly, comprising a deformable tubular element partly located within a fluid containing vessel having at least one opening with an inside wall, said tubular element having an upper and one lower sealing portion on either end respectively, a movable shaft, a portion of which being surrounded by said tubular element and wherein the lower sealing portion is attached and sealed to one part of said shaft, or an extension thereof, whereas the upper sealing portion is sealed and attached to said opening of said fluid containing vessel, wherein said tubular shaft seal is capable of shielding a portion of said movable shaft penetrating within said fluid containing vessel from any contact with said fluid, said fluid containing vessel has an upper opening retaining therein an adjustable bonnet having a central bore allowing the passage of said shaft and furthermore having a convex conical section capable of engaging a concave conical opening within said upper sealing portion of said tubular element, said convex conical section being retained by a stepped shoulder within said upper opening, and wherein said bonnet is capable of tightly engaging the convex conical section into said concave conical opening thereby forcing said upper sealing portion into a tight sealing engagement with said stepped shoulder of said upper opening, said movable shaft has a lower terminating end having a stepped shoulder and a reduced, threaded, diameter portion engaging a shaft extension having an opening having an enlarged groove, receiving therein the lower end of said tubular element having a reduced internal diameter portion, a conical member placed inside the end of said tubular element and between the stepped shoulder of said shaft and the reduced diameter portion of said tubular element near the bottom of said opening within the shaft extension and wherein said threaded diameter portion being capable of forcing the lower portion of said tubular element to be radially spread to engage the grooved portion of the concave opening of said shaft extension and thereby preventing fluid from entering said concave opening.