Air outlet having angularly adjustable louvers

Claim 1

A ONE-PIECE VANE FOR A LOUVERED AIR OUTLET OR THE LIKE, OF THE TYPE HAVING AN ELONGATED BLADE PORTION AND COAXIAL TRUNNIONS PROJECTING LENGTHWISE FROM THE ENDS OF THE BLADE PORTION AND RECEIVABLE IN APERTURES IN A PAIR OF OPPOSITE FRAME MEMBERS TO MOUNT THE VANE FOR ANGULAR ADJUSTMENT, SAID VANE BEING CHARACTERIZED BY: (A) THE BLADE PORTION OF THE VANE BEING HOLLOW AND COMPRISNG A PAIR OF FLATWISE ADJACENT SHEET METAL WALL ELEMENTS INTEGRALLY CONNECTED WITH ONE ANOTHER AROUND A SUBSTANTIALLY SHARP BEND WHICH EXTENDS ALONG ONE LONGITUDINAL EDGE OF THE BLADE, SAID WALL ELEMENTS HAVING FREE MARGINAL EDGE PORTIONS AT THE OPPOSITE LONGITUDINAL EDGE OF THE BLADE THAT ARE RESILIENTLY FLEXIBLE TOWARD AND FROM ONE ANOTHER; AND (B) EACH OF SAID TRUNNIONS COMPRISING AN ENDWISE PROJECTING INTEGRAL PROTUBERANCE ON EACH OF SAID WALL ELEMENTS LATERALLY SPACED FROM THE FIRST DESIGNATED LONGITUDINAL EDGE OF THE BLADE, THE TWO PROTUBERANCES AT EACH END OF THE BLADE BEING OPPOSITE ONE ANOTHER AND HAVING COMPLEMENTARY SUBSTANTIALLY ARCUATE CURVATURES IN TRANSVERSE SECTION, THE RESILIENCE OF THE WALL ELEMENTS PERMITTING THE OPPOSITE PROTUBERANCES TO BE CONVERGED SO THAT THE TRUNNION THAT THEY COOPERATE TO PROVIDE CAN BE INSERTED INTO AN APERTURE AND CAN DILATE UNDER RESILIENT BIAS INTO A SNUG FIT IN THE APERTURE WHEREBY THE VANE IS FRICTIONALLY HELD IN ANY POSITION OF ANGULAR ADJUSTMENT.