Ventilator grill and method for assembling the same

A ventilator grill comprising:

• an outer frame made of synthetic resin, said outer frame having a rectangular inlet opening and a rectangular outlet opening and two pairs of side walls, the side walls of each of said pairs being parallel to each other;
• at least one stationary vane integrally molded with and extending between the side walls of one of said two pairs of side walls, said stationary vane being in parallel to the side walls of the other pair of side walls;
• a plurality of through holes provided on each of the side walls of the other pair of side walls;
• arcurate recess means provided in an end face of said stationary vane, which opposes said inlet opening of said outer frame, said arcurate recess means having a circular arc;
• and
• at least one movable vane formed of a different resin extending across said stationary vane and between the side walls of said other pair, said movable vane being provided at opposite sides thereof with integral journal shafts received within the through holes for permitting said movable vane to swing about an axis of swing, and being provided at one end thereof opposing said outlet opening of said outer frame with a portion which is in engagement with said arcurate recess means, said axis swing of said movable vane extending through a center of said circular arc of said arcurate recess means.

A method for assembling a ventilator grill which includes an outer frame formed from a first synthetic resin, said outer frame having two pairs of side walls, the side walls of each of said pairs being parallel to each other, at least one stationary vane extending between the side walls of a first pair of said pairs of side walls and being parallel to the side walls of said second pair of side walls, and a plurality of through holes provided in each side wall of said second pair of side walls, and at least one movable vane extending across said stationary vane and between the side walls of said second pair of side walls, said method comprising:

• first molding an outer frame of a first synthetic resin in a mold;
• disposing said molded outer frame within a mold half and closing said mold with a second mold half to form a complete mold having a molding cavity, a part of which is defined by a part of an edge surface of said stationary vane and said through holes in said side walls of said outer frame;
• injecting a second synthetic resin, having no bondability to said first synthetic resin and having a melting point lower than that of said first synthetic resin, into said molding cavity, thereby forming in said complete mold cavity and said molded outer frame at least one movable vane extending across said stationary vane in said molded outer frame and journal shafts projecting from each of said opposite sides of said movable vane into said through holes in said side walls for permitting said movable vane to swing in an arc about an axis of said journal shafts;
• and
• cooling and removing said ventilator grill.