Ventilating device

Claim 1

A VENTILATING DEVICE FOR A BUILDING-WALL OPENING COMPRISING AN OPEN BOUNDING STRUCTURE FOR INSERTION IN A BUILDING-WALL OPENING, A GRILLE EXTENDING ACROSS SAID BOUNDING STRUCTURE, A LOWER WALL EXTENDING UPWARD AND INWARD FROM A LOWER REGION OF SAID BOUNDING STRUCTURE, SIDE WALLS EXTENDING INWARD FROM OPPOSITE SIDES OF SAID BOUNDING STRUCTURE TO SAID LOWER WALL, MOUNTING MEANS FOR SWINGABLY SECURING A CLOSURE TO AN UPPER REGION OF SAID BOUNDING STRUCTURE, A CLOSURE MOUNTED ON SAID MOUNTING MEANS AND GRAVITIONALLY URGED TO A POSITION EXTENDING DOWNWARD AND INWARD INTO CLOSING RELATION WITH SAID LOWER AND SIDE WALLS, SAID CLOSURE BEING SWINGABLE UPWARD AGAINST GRAVITY AWAY FROM SAID LOWER AND SIDE WALLS TO AN OPEN POSITION, AN OPERATING LINKAGE, AND ACTUATING MEANS CARRIED EXTERIORLY OF SAID GRILLE FOR ACTUATING SAID LINKAGE TO POSITION SAID CLOSURE, SAID LINKAGE COMPRISING A LEVER EXTENDING THROUGH SAID GRILLE HAVING ITS OPPOSITE ENDS RESPECTIVELY OUTWARD AND INWARD OF SAID GRILLE AND PIVOTALLY MOUNTED INTERMEDIATE ITS ENDS FOR SWINGING ABOUT A GENERALLY HORIZONTAL AXIS, THE OUTER END OF SAID LEVER BEING CONNECTED TO SAID ACTUATING MEANS, AND SAID LINKAGE MEANS COMPRISING A LINK CONNECTING THE INNER END OF SAID LEVER AND SAID CLOSURE AT A LOCATION DOWNWARD OF THE CLOSURE-MOUNTING MEANS FOR ACTUATION OF SAID LINK AGAINST THE WEIGHT OF SAID CLOSURE IN ALL CLOSURE POSITIONS, SAID ACTUATING MEANS COMPRISING A THERMAL-RESPONSIVE ELEMENT MOUNTED ON SAID GRILLE AND CONNECTED TO SAID LINKAGE FOR POSITIONING SAID CLOSURE IN RESPONSE TO AMBIENT TEMPERATURE, AND A SHIELD OVER THE EXTERIOR OF SAID ACTUATING MEANS TO EXCLUDE DIRECT SUNLIGHT FROM OPERATING SAID ACTUATING MEANS.