Sealed joint

Claim 1

A fluidtight flexible seal for sealing inner and outer cylindrical members to each other for movement of the inner member relative to the unmovable outer member, said seal comprising: a first annular sleeve of U-shaped cross-sectional configuration and of flexible fluidtight material, an outer annular flange projecting outwardly from the outer leg of said first annular sleeve, an inner annular flange projecting inwardly from the inner leg of said first annular sleeve, a second annular sleeve of U-shaped cross-sectional configuration and of flexible fluidtight material, said second annular sleeve being arranged oppositely to the first sleeve and the sleeves opening toward each other, an outer annular flange projecting outwardly from the outer leg of said second annular sleeve, an inner annular flange projecting inwardly from the inner leg of said second annular sleeve, annular groove means in the outer face of said movable inner member, wherein said both inner flanges of said sleeves are secured in fluidtight relationsip to said inner member, a first annular groove in the inner face of said unmovable outer member, wherein said outer flange of said first sleeve is secured in fluidtight relationship to said outer member, a second annular groove in said inner face of said unmovable outer member, wherein said outer flange of said second sleeve is secured in fluidtight relationship to said outer member, said second groove being axially spaced from the first groove, whereby a closed annular chamber is defined by said sleeves and at least said outer member, means defining an opening through said outer member between said both outer flanges of said sleeves, and a socket mounted on said outer member about said opening for introducing fluid under pressure into said annular chamber.