Push rod bearing and seal means

Claim 1

In a servomotor, a bearing and seal means retained in a first section of a bore in a housing for aligning a push rod attached to a movable wall in a power producing chamber with a piston retained in a secOnd section of said bore to prevent air from being communicated from the power chamber into the first section in a first condition and to prevent fluid under pressure present in the first bore from being communicated into the power producing chamber in a second condition, said bearing and seal means comprising: a cylindrical member having a first end and a second end with an axial bore concentric to the first section, said cylindrical member having a first annular groove on its peripheral surface, and a second annular groove on its second end, said peripheral surface on the cylindrical member substantially matching that of the first section of the housing, said axial bore being adapted to receive said push rod; first resilient means located in said first annular groove for preventing the occurrence of said first and second conditions along the periphery of said cylindrical member; second resilient means having a first projection extending from a first side of a disc section and a second projection having a rib on the end thereof, said rib being adapted to bias the second projection into an interference contact with said push rod, said second resilient means preventing the occurrence of the first and second conditions along the axial bore of the cylindrical member; spacer means located in the first section between the second end of the cylindrical member and a shoulder adjacent the second section of said bore, said spacer means overlying a portion of said disc to rigidly position said first annular projection in the second annular groove; and keeper means secured to said housing for maintaining said cylindrical member and said spacer means in a stationary position within said first section of said bore.