Seal arrangements

Claim 2

The seal assembly of claim 1 wherein the inner diameters of said gasket element and said washer are substantially coterminous and the section of said casing adjacent said gasket in contact therewith over substantially the entire face of said gasket.

Claim 3

The seal assembly of claim 1 wherein said washer and said casing are formed of metal.

Claim 4

In combination, a seal housing adapted to be received within an accommodating operative through which a rotatable shaft is to be mounted, a flange on said seal housing and a seal assembly for said shaft including a washer-shaped sealing element of sealing material mounted in sealing contact about said shaft, a washer-shaped gasket of elastomeric material positioned against one face of said sealing element, a rigid washer element positioned against the other face of said sealing element, the outer peripheries of said sealing element, said gasket and said washer element being coterminous, and a casing holding said washer element, said gasket and said sealing element in face-to-face operative relationship, said sealing element having an inner peripheral diameter less than the inner diameter of said gasket and said casing, said casing having one section thereof disposed in contact with said gasket against the face thereof remote from said sealing element and another section of said casing extending around the outer peripheries of said washer, said gasket and said sealing element and into contact with a portion of the face of said washer remote from said sealing element, and a radially outwardly generally U-shaped extension on one section of said casing for securing said seal assembly to said flange of seal housing with said sealing element in sealing contact about said shaft.

Claim 5

The seal assembly of claim 5 wherein said sealing element is formed of polytetrafluoroethylene and said extension is formed on the section of said casing in contact with said gasket.

Claim 6

In combination a seal housing having a cylindrical portion and an inwardly extending flange portion defining a circular opening, a washer-shaped seal element of polytetrafluoroethylene, a washer-shaped gasket of an elastomeric material and a rigid seal casing having a pair of opposed sections within which said seal element and said gasket are sealed in contiguous disposition, said seal element having an inner peripheral diameter less than the inner diameter of said gasket and said casing, said seal element and said gasket being urged into sealed relationship by and between said opposed sections and a radially outwardly generally U-shaped extension on one of said sections for securing said casing to said flange with said sealing element in operative position within said opening.

Claim 7

The invention as defined in claim 7 wherein said extension is formed on the section of casing adjacent said gasket.