Patent Publication Number: US-4543754-A

Title: Clip-on chimney hood

Description:
This invention relates to a chimney hood and, more particularly, to one that can be clipped onto the interior of a chimney or chimney liner without the need of fastening elements. 
     An outstanding disadvantage of conventional chimney hoods is that they generally require fastening elements for securing to the chimney. Such fastening elements, in time, will rust or deteriorate from the weather and heat in the chimney. Moreover, a further disadvantage is that the hood is not relatively adjustable in height from the chimney to accommodate different types of fuel burning. 
     An object of the invention is to provide a novel clip-on chimney hood that overcomes the above-named difficulties. 
     A more specific object of the invention is to provide a novel clip-on chimney hood that can be easily and quickly mounted or dismounted from a chimney without the necessity of fastening elements. 
     Another object of the invention is to provide an improved chimney hood structure that easily enables adjustment of the distance between the hood and top of the chimney or its liner. 
    
    
     Other objects and advantages of the invention will become more apparent from a study of the following description taken with the accompanying drawing wherein: 
     FIG. 1 is an elevational view of one form of a clip-on chimney hood embodying the present invention; 
     FIG. 2 is a side view of FIG. 1; 
     FIG. 1a is an elevational view of the structure of FIG. 1 when squeezed and fitted in a chimney or liner. 
     FIG. 3 is a further modification of the circular cable having mounted, on a portion thereof, a corrugated hood; 
     FIG. 3a is a further modification of FIG. 1 when squeezed and fitted in a chimney or liner showing a U-shaped spring of either metal or cable having a corrugated hood attached to the extremeties thereof by means of wire fasteners; 
     FIG. 4 is a side view of the hood assembly shown in FIG. 3; 
     FIG. 5 shows a still further modification involving an inverted U-shaped spring having a corrugatd hood attached to a central portion thereof; 
     FIG. 5a is a side view of the hood assembly shown in FIG. 5; 
     FIG. 6 is a still further modification showing a circular spring or cable to which is welded or brazed a corrugated hood; 
     FIG. 7 is a still further modification after being squeezed to fit into a chimney or liner, showing a loop of oval shape with a corrugated hood secured thereto by removable fastening means; 
     FIG. 8 shows still another modification, similar to FIG. 7, when supported inside a chimney; and 
     FIG. 9 shows the modification of FIG. 7 and illustrating the hood assembly 2 supported by the liner of the chimney. 
    
    
     Referring more particularly to FIG. 1, numeral 1, denotes a portion of a ring of spring steel or utility cable to the end portions of which is secured a corrugated sheet of non-corrosive metal or other suitable material. The ends are welded or brazed or otherwise fastened to the end portions of spring 1. As will be noted in FIG. 2, a pair of springs, such as 1, are employed but is should be understood that a single spring 1 secured to the central portion of the hood, such as the modification shown in FIG. 5a, may be used instead. 
     FIG. 1a shows a U-shaped spring or cable after being squeezed to fit into a chimney or liner, to the ends of which are secured a corrugated hood 2a by means of welding or brazing. 
     FIG. 3 shows a hoop-like spring 1b which may be made either of spring metal or from a piece of utility cable whose ends are inserted in a sleeve 4 snugly fitted thereon and which may be welded or brazed to the cable at least at central portions. A corrugated hood 3a is mounted on the upper third of the spring 1b by means of fastening elements of wire 3b and by said welding and brazing. 
     FIG. 3a shows a structure nearly identical with FIG. 1a but wherein removable fastening elements 3a are provided instead of welding or brazing. However, either a double spring as shown in FIG. 2, or a single spring may be used instead as shown in FIG. 5a, in the modifications of FIG. 1, FIG. 3, FIG. 6 and FIG. 7. 
     FIG. 5 shows a further modification embodying an inverted U-shaped spring 1c having mounted, on its central portion, a corrugated hood 2c by means of welding or brazing or wire fasteners 3a while the end portions may be held only by removable wire fasteners. There may be a single wire 1c, as shown in FIG. 5a, or a double wire as shown in FIG. 2. 
     FIG. 6 shows a still further modification involving a wire hoop 1d of metal or utility cable to which is welded or brazed, at points 5d, a corrugated hood 2d. 
     FIG. 7 shows a modification of FIG. 6, after being squeezed to fit a chimney or liner, comprising an oval shaped spring 1d of metal or of utility cable having attached, by means of non-corrosive fastening elements 5d, a hood 2d. 
     FIG. 8 shows a structure such as in FIG. 6 after being squeezed to fit in a chimney, and illustrating how the ends of the hood are supported directly on top of the chimney. 
     FIG. 9 shows a modification similar to FIG. 7 wherein the ends of the hood are supported directly on a chimney liner 6. When it is desired to provide a smaller opening between the hood and the chimney liner, the end fasteners are removed to accommodate gas burning instead of coal or wood burning. 
     The spring has a dual function by acting as a frame for the hood and as a fastening means by clipping onto the interior of the chimney or its liner. Moreover, the spring and hood assembly is of lower cost than conventional hood structures. 
     Thus it will be seen that I have provided a chimney hood that can be easily and quickly slipped onto the inner surface of a chimney or chimney liner and which can be easily adjusted in height relative to the top of the chimney. 
     While I have illustrated and described several embodiments of my invention, it will be understood that these are by way of illustration only and that various changes and modifications may be contemplated in my invention and within the scope of the following claims: