Multi-cell inflatable seal

Claim 1

A SEQUENTIALLY EXPANDIBLE DUAL CHAMBERED INFLATABLE SEALING STRIP ASSEMBLY FOR SEALING AGAINST GAS LEAKAGE BETWEEN RELATIVELY MOVABLE MEMBERS WHEREIN SUCH LEAKAGE TENDS TO RESULT FROM A PRESSURE DIFFERENTIAL EXISTING ACROSS THE MEMBERS COMPRISING A GENERALLY U-SHAPED LONGITUDINALLY EXTENDING CHANNEL MEMBER ADAPTED TO BE FIXEDLY MOUNTED WITH ITS CLOSED END CONTACTING ONE OF SUCH RELATIVELY MOVABLE MEMBERS, SAID CHANNEL HAVING AN INWARDLY PROJECTING RIDGE INTEGRAL WITH EACH LEG OF SAID U-SHAPED CHANNEL MEMBER ADAPTED TO RETAIN A SEALING STRIP, A LONGITUDINALLY EXISTING SEALING STRIP HAVING A FLEXIBLE BASE PORTION WITH OUTWARDLY PROJECTING RIDGE PORTIONS CONTACTING THE BOTTOM OF SAID CHANNEL MEMBER BELOW SAID INWARDLY PROJECTING CHANNEL RIDGES AND BEING RETAINED THEREBY; AN ESSENTIALLY ANNULAR RIDGES INFLATABLE MEMBER INTEGRAL WITH SAID BASE PORTION, SAID FIRST INFLATABLE MEMBER HAVING A SEALING EDGE ADAPTED TO CONTACT THE OTHER OF THE MOVABLE MEMBERS UPON INFLATION OF SAID FIRST INFLATABLE MEMBER WHEREBY IT IS EXPANDED TO PARTIALLY EXTEND OUT OF SAID CHANNEL MEMBER; A FIRST MEANS COMMUNICATING THROUGH SAID BASE PORTION WITH THE INTERIOR OF SAID FIRST INFLATABLE MEMBER FOR INFLATING SAID FIST INFLATABLE MEMBER, SAID FIRST INFLATING MEANS NOT PROJECTING ABOVE THE UPPER SURFACE OF SAID BASE PORTION; A SECOND INFLATABLE MEMBER DISPOSED WITHIN SAID FIRST INFLATABLE MEMBER; A SECOND MEANS COMMUNICATING THROUGH SAID BASE PORTION WITH THE INTERIOR OF SAID SECOND INFLATABLE MEMBER FOR INFLATING SAID SECOND MEMBER, SAID SECOND INFLATABLE MEMBER HAVING ITS LONGITUDINALLY EXTENDING LOWER SURFACE BONDED TO THE UPPER SURFACE OF SAID FLEXIBLE BASE PORTION EXCEPT IN THE REGION OF SAID FIRST INFLATING MEANS WHEREBY WHEN PRESSURIZED GAS IS APPLIED TO SAID FIRST INFLATING MEANS THE LOWER SURFACE OF SAID SECOND INFLATABLE MEMBER IS RAISED CLEAR OF SAID BASE PORTION IN THE UNBOUNDED REGIONS TO PERMIT PRESSURIZED GAS TO BE INTRODUCED INTO SAID FIRST INFLATABLE MEMBER THROUGH SAID FIRST INFLATING MEANS.