Low-friction, boat-type rocker arm

Claim 1

A boat-type rocker arm assembly comprising a pedestal having a fulcrum and a shank, said fulcrum extending outwardly beyond two opposite sides of said shank, said fulcrum having curved lower surfaces of a predetermined radius, an elongate, cold-formed, boat-type rocker arm of generally U-shaped configuration in transverse cross section throughout most of its length and having an intermediate curved interior surface extending there-across between its ends, said interior surface being straight as viewed in transverse cross section, said rocker arm having an opening centrally located in the intermediate surface through which said shank of said pedestal extends, one end portion of said rocker arm having a concave recess adapted to receive the upper end of a push rod, the other end portion of said rocker arm having a rectangular opening therein, side walls of said rocker arm above said rectangular opening having round openings therein, an axle extending through said round openings and mounted in said side walls for prevention of longitudinal movement of said axle, and a roller rotatably mounted on said axle and having a circumferential portion exposed at said rectangular opening whereby said roller engages a valve stem.