Abstract: A fan blade, secured to an arm of the fan, extends radially outwardly beyond the arm and is secured to the arm by a plurality of rivets, a continuous circular rib being formed about the radially outermost rivet, the rib comprising on one side of the blade a groove having a depth and a cross-sectional radius equal to the blade material thickness.

Abstract: A cannister purge valve assembly for a vehicle emissions control system is disclosed which includes a housing defining a chamber which is divided into a pair of sections by a diaphragm carried by the valve housing. One of the sections has inlets communicated to the vehicle fuel tank and to the vapor absorbing cannister and an outlet which is communicated to engine intake manifold vacuum when the vehicle engine is operating. The other section is provided with an inlet which is communicated to the spark port on the vehicle carburetor so that the other section is communicated to a vacuum level when the engine is running. The inlet communicated to the cannister and the outlet communicated to the intake manifold terminate in a pair of coaxial tubes which extend into the chamber. Corresponding ends of the tube are substantially coplanar to define a valve seating area.

Abstract: A flexible bladed fan comprising blade assemblies having a reinforcing member contacting each blade along the leading portion thereof, the blade and reinforcing member spaced apart at a gap behind the leading portion and contacting again at a second position behind the gap, the reinforcing member biasing the blade in a downstream direction at the second position.