Patent Publication Number: US-2018045417-A1

Title: Double wall fire pit

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims priority to U.S. Provisional Application No. 62/373,852, filed Aug. 11, 2016, which is herein incorporated by reference in its entirety. 
    
    
     FIELD OF THE INVENTION 
     The invention relates to heating systems. More specifically, but not exclusively, the invention relates to fire pits. 
     BACKGROUND OF THE INVENTION 
     Fire pits are common to create outdoor atmosphere and heat during cold weather. The heat coming from the conventional fire pit rises upwardly and to some extent it flows outwardly for persons around the fire pit to enjoy. Persons must sit very close to the fire pit to receive its heat benefits. 
     What is needed is a fire pit that will provide heat comfort to persons sitting around the fire pit some distance from the fire pit itself. 
     BRIEF SUMMARY OF THE INVENTION 
     Therefore, it is the primary objective, feature, and/or advantage of the invention to improve on and/or overcome a deficiencies in the art. 
     It is another object, feature, and/or advantage of the invention to utilize fire pit heat for providing heat to persons sitting at some distance from the fire pit by heat being transmitted radially outwardly in addition to vertically upwardly. 
     It is yet another object, feature, and/or advantage of the invention to provide a pair of spaced apart inner and outer vertical concentric walls providing a circular air passageway therebetween with the passageway receiving heat from the fire pit being conducted through the inner wall into the passageway. 
     These and/or other objects, features, and advantages of the invention will be apparent to those skilled in the art. The invention is not to be limited to or by these objects, features, and advantages. No single embodiments need provide each and every object, feature, or advantage. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a fire pit installed in the ground with registers provided radially and circumferencely around the fire pit. 
         FIG. 2  is a perspective view of the installed fire pit with the underground components being shown in dash lines. 
         FIG. 3  is a perspective view of the double wall fire pit including a pair of spaced apart inner and outer vertical concentric walls providing a circular air passageway therebetween. 
         FIG. 4  is a cross sectional view taken along line  4 - 4  in  FIG. 2  showing air being provided into the circular air passageway and heated air from the passageway being distributed to ground surface mounted registers spaced radially out from the double wall fire pit. 
     
    
    
     Various embodiments of the invention will be described in detail with reference to the drawings, where like reference numerals represent like parts throughout the several views. Reference to various embodiments does not limit the scope of the invention. Figures represented herein are not limitations to the various embodiments according to the invention and are presented for exemplary illustration of the invention. 
     DETAILED DESCRIPTION 
     The double wall fire pit  10  shown in  FIG. 2  includes an inner wall  12  and an outer wall  14  as seen in  FIG. 3  which provides an air passageway  16  therebetween. A horizontal top wall  18  is provided over the top of the inner wall  12  and outer wall  14 . The lower side of the air passageway  16  is open but closed by the ground when installed as seen in  FIG. 2 . 
     An air inlet opening  20  is provided in the outer wall  14  and receives a pipe  22  having an inner end  24  inside the air passageway  16  and an outer end  26  extending outwardly and above ground for connection to a fan  28 . An electrical power cord  30  is provided for operating the fan  28 . 
     A chamber  32  is provided inside the fire pit to receive flammable materials such as firewood (not shown). The heat from the flammable material when burning is transmitted through the metal inner wall  12  to the air passageway  16  which is circulating air as indicated by the arrows  34  inside the air passageway. 
     Air outlet openings  36  are positioned around and through the outer wall  14  to distribute heated air through conduits  38  to registers  40  facing upwardly and providing heated air  42 . Ground material  44  is provided over the conduits  38  to provide a finished look surrounding the fire pit  10 . The top wall  18  is coplanar with the ground material  44 .