Klaus Faber, Age 89678 Ray St, Manchester, NH 03104

4052112, Oct 4, 1977

May 14, 1976

5/687387

Klaus Faber - Manchester NH

Disogrin Industries, Inc. - Manchester NH

F16J 1524

308 35

A seal assembly for use on a piston having a piston seal groove with spaced shoulders formed therein comprising a deformable sealing ring adapted to be maintained in the groove and having inner and outer peripheral sealing portions, and side surfaces, the sealing ring is comprised of a homogeneous thermosetting elastomeric material having a relatively high shear modulus and being wear, tear, and abrasion resistant; and a pair of unitary bearing means, each of which is juxtaposed opposite the side surfaces of the sealing ring and is made of a wear-resistant material which is harder than the material of the sealing ring. Each of the bearing means includes bearing section means and support section means. The bearing section means is adapted to be seated on a corresponding shoulder formed in the piston groove for providing a bearing support for said seal assembly, and the support section means contacts the sealing ring and includes generally concave surface means which generally conform to at least portions of the side surfaces of the sealing ring for preventing extrusion and twisting of the sealing ring.