Patent ID: 7021633

Claim:
In combination, an elevator ram and cylinder with a continuously lubricating low friction fluid seal device therebetween, said combination comprising: (a) an elevator ram inside a cylinder defining an annular space between said ram and said cylinder; and (b) a U-type fluid seal ring positioned in said annular space between said cylinder and said moving ram, said seal ring having an outer cylindrical surface and comprising: an annular body having an inner side and an outer side; a closed end face and an at least partly open end face; at least one first radial sealing area protruding outwardly from said outer side and in contact with said cylinder and at least one second radial sealing area protruding inwardly from said inner side of said annular body and in contact with said ram; and said fluid seal ring being formed at least in part from an elastomeric compound; wherein an additive is included in said elastomeric compound of said fluid seal ring comprising between about 1.0–5.0% by weight of oleamide in order to reduce the coefficient of friction and low speed vibration of said seal ring against said ram; and further wherein a carbon black filler is included in said elastomeric compound of said fluid seal ring.