Patent ID: 6354567
Filing Date: 2002-03-12
Classification: B29C,B29L,F02D,F05C,F16K

Abstract:
A throttle shaft and butterfly valve construction comprising:a throttle shaft component of a plastic material having a throttle shaft portion formed with a flat surface, a pair of spaced apart bosses projecting from the surface and lying within an outer circumferential surface of the throttle shaft portion, the throttle shaft having a first shaft rib extending upward from the flat surface and running parallel to the longitudinal axis of the shaft; a butterfly plate, comprising a disc of a plastic material having first and second sides and formed with a pair of spaced apart holes adapted to overlie the pair of bosses, wherein the first side abuts the flat surface with the bosses projecting through the holes, the holes chamfered from the other side of the butterfly plate; wherein the bosses are heat staked over the butterfly plate and flowing plastic composite material from the bosses into the chamfered surfaces to secure the throttle plate to the throttle shaft; the first side having a first recess with a longitudinal extent substantially parallel to the longitudinal axis of the shaft and containing the first shaft rib.