Ventilator hood with collapsible bonnet

Claim 1

A HOOD FOR A VENTILATOR ADAPTED TO BE MOUNTED ABOVE A COOKING SURFACE, SAID HOOD COMPRISING A HOUSING AND A BONNET AT THE FRONT OF SAID HOUSING, SAID HOUSING COMPRISING TOP, REAR AND SIDE PANELS, MEANS PRESENTING VERTICAL SLOTS AT THE FRONT OF SAID HOUSING ADJACENT EACH SIDE THEREOF, SAID BONNET COMPRISING GENERALLY TRIANGULAR SIDE PANELS HAVING SLOPING UPPER EDGES AND A TOP PANEL CONNECTED BETWEEN SAID SIDE PANELS, PIVOT MEANS AT THE UPPER CORNERS OF SAID BONNET SIDE PANELS SLIDABLE IN SAID SLOTS THEREBY CONNECTING SAID BONNET TO SAID HOUSING, A GUIDE WHEEL INTERIORLY ADJACENT EACH HOUSING SIDE PANEL, MEANS MOUNTING EACH WHEEL FOR ROTATION ABOUT A HORIZONTAL AXIS, AN ARM PIVOTALLY CONNECTED BETWEEN AN OFF-CENTER POINT ON EACH SAID WHEEL AND A BONNET SIDE PANEL, AND STOPS ON SAID WHEELS PERMITTING LIMITED ROTATION OF SAID WHEELS WITH RESPECT TO SAID ARMS, ONE OF SAID STOPS ON EACH WALL ENGAGING THE UNDERSIDE OF EACH RESPECTIVE ARM BETWEEN THE CONNECTION OF SAID ARM TO SAID BONNET SIDE PANEL AND THE CONNECTION OF SAID ARM TO SAID WHEEL TO LIMIT REARWARD MOVEMENT OF SAID BONNET TOWARDS SAID HOUSING, WHEREBY WHEN SAID BONNET IS SIMULTANEOUSLY TIPPED ABOUT SAID PIVOT MEANS AND MOVED REARWARDLY TOWARDS SAID HOUSING SAID WHEELS AND ARMS GUIDE THE BONNET TOP PANEL INTO A VERTICAL POSITION SUCH THAT THE TOP EDGE OF SAID BONNET TOP PANEL IS ADJACENT THE FRONT EDGE OF SAID HOUSING TOP PANEL.