Adjustable fire louvre

Claim 1

IN A LOUVRE HAVING A FRAME, A PLURALITY OF LOUVRE BLADES PIVOTALLY MOUNTED ON THE FRAME FOR MOVEMENT TO OPEN POSITIONS AND TO CLOSED POSITIONS TO CONTROL MOVEMENT OF AIR THROUGH THE LOUVRE, AND A CONTROL MEMBER CONNECTED TO EACH LOUVRE BLADE FOR SIMULTANEOUSLY CONTROLLING THE OPEN AND CLOSED POSITIONS OF THE LOUVRE BLADES, THE IMPROVEMENT OF: PIN MEANS SECURED TO AND PROJECTED FROM THE CONTROL MEMBER, A WEIGHT NORMALLY SPACED ABOVE THE PIN MEANS, RELEASE MEANS CONSTITUTED AS A PIN MOVABLY MOUNTED ON THE FRAME BETWEEN A FIRST WEIGHT SUPPORTING POSITION WHERE IT HOLDS THE WEIGHT SPACED ABOVE THE PIN MEANS AND A SECOND POSITION CLEAR OF SAID WEIGHT, MEANS BIASING THE RELEASE MEANS TOWARD SAID SECOND POSITION TO BE OUT OF ENGAGEMENT WITH SAID WEIGHT AND MEANS INCLUDING A FUSIBLE MEANS FOR HOLDING THE RELEASE MEANS IN SAID FIRST POSITION IN ENGAGEMENT WITH THE WEIGHT THEREBY HOLDING THE WEIGHT SPACED ABOVE THE PIN MEANS, SAID BIASING MEANS ON DESTRUCTION OF SAID FUSIBLE MEANS DISENGAGES THE RELEASE MEANS FROM THE WEIGHT WHEREUPON THE WEIGHT FALLS BY GRAVITY STRIKING THE PIN MEANS MOVING THE CONTROL MEMBER WHICH IN TURN MOVES THE LOUVRE BLADES TO THEIR CLOSED POSITIONS.