Patent Publication Number: US-2005133017-A1

Title: Double-pit outdoor grill

Description:
CROSS REFERENCE TO RELATED APPLICATIONS  
      1. This application claims the benefit of U.S. Provisional Application No. 60/531,708 filed Dec. 23, 2003.  
    
    
     BACKGROUND OF THE INVENTION  
      This invention relates to a double-pit outdoor grill which consists of two more or less symmetrical cooking chambers placed fore and aft of the back wall of each chamber joined to form a common wall in which the common wall between the two chambers have openings which permit the flow of heat/air from the lower chamber through to the upper chamber with same exiting the upper chamber by way of a centrally located stack. The lower chamber has an air intake located along the forward and bottom mid-section of the chamber, allowing air to draft in along the bottom of the lower chamber which is used to bum wood or similar cooking materials. Either through the natural draw of air or with the assistance of a high temperature furnace fan, which can be situated either over the stack of the upper compartment [resulting in a draw of air through the upper and lower compartments] or fixed in front of the lower compartment air intake (acting as a forced air device, pushing air from the lower compartment through the cooking fuel and into the upper compartment), temperature can be increased and/or the combustion process accelerated. The two symmetrical upper and lower chambers are joined by their aft walls, each running the same width which produces a fire box and confection oven, thus allowing for the even distribution of heat from the fire box to the confection oven. The symmetrical design of the two chambers further permits both cooking chambers to be used simultaneously, one as an oven cooker, and the second is a direct fire pit. Symmetry of the items allows for even distribution of heat from the fire box to the oven, and the placement of the upper and lower chambers, allows for air to draw in through the lower, fire box, and follow its natural path of rising and exiting through the upper oven box.  
     BRIEF SUMMARY OF THE INVENTION  
      This device consists of two more or less symmetrical cooking chambers placed fore and aft of the back wall of each chamber joined to form a common wall. The two chambers are arranged such that one is located with its base 50% of the distance up from the base of the second chamber creating an upper and lower chamber, both being more or less symmetrical compartments. The common wall between the two chambers have openings which permit the flow of heat/air from the lower chamber through to the upper chamber with same exiting the upper chamber by way of a centrally located stack. The lower chamber has an air intake located along the forward and bottom mid-section of the chamber, allowing air to draft in along the bottom of the lower chamber which is used to burn wood or similar cooking materials. Either through the natural draw of air or with the assistance of a high temperature furnace fan, which can be situated either over the stack of the upper compartment [resulting in a draw of air through the upper and lower compartments] or fixed in front of the lower compartment air intake (acting as a forced air device, pushing air from the lower compartment through the cooking fuel and into the upper compartment), temperature can be increased and/or the combustion process accelerated.  
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
      The objects of the invention are achieved as set forth in the illustrative embodiments shown in the drawings which form a part of the specification  
       FIG. 1  is a diagram of the profile view working model.  
       FIG. 2  is a diagram of the aft view working model lower chamber with perforated common wall.  
       FIG. 3  is a diagram of the profile view of working model showing orientation of upper and lower chamber.  
       FIG. 4  is a diagram of the aft view of the working model.  
       FIG. 5  is a diagram of the side profile view of working model showing orientation of the upper and lower chambers.  
       FIG. 6  is a diagram of the side profile of working model showing available cooking surface of lower chamber.  
       FIG. 7  is a diagram of the air induction fan of working model.  
    
    
     DETAILED DESCRIPTION OF INVENTION  
      This device consists of two more or less symmetrical cooking chambers placed fore and aft of the back wall of each chamber joined to form a common wall. The two chambers are arranged such that one is located with its base 50% of the distance up from the base of the second chamber creating an upper and lower chamber, both being more or less symmetrical compartments. The working model uses two symmetrical chambers with dimensions of 3 feet in depth by 4 feet in width. The common wall between the two chambers have openings which permit the flow of heat/air from the lower chamber through to the upper chamber with same exiting the upper chamber by way of a centrally located stack. The lower chamber has an air intake located along the forward and bottom mid-section of the chamber, allowing air to draft in along the bottom of the lower chamber which is used to burn wood or similar cooking materials. Either through the natural draw of air or with the assistance of a high temperature furnace fan, which can be situated either over the stack of the upper compartment [resulting in a draw of air through the upper and lower compartments] or fixed in front of the lower compartment air intake (acting as a forced air device, pushing air from the lower compartment through the cooking fuel and into the upper compartment), temperature can be increased and/or the combustion process accelerated.  
      The two symmetrical upper and lower chambers are joined by their aft walls, each running the same width which produces a fire box and confection oven, thus allowing for the even distribution of heat from the fire box to the confection oven. The symmetrical design of the two chambers further permits both cooking chambers to be used simultaneously, one as an oven cooker, and the second is a direct fire pit. Symmetry of the items allows for even distribution of heat from the fire box to the oven, and the placement of the upper and lower chambers, allows for air to draw in through the lower, fire box, and follow its natural path of rising and exiting through the upper oven box.  
      Following the basic principles of symmetry and box orientation, the cooking chambers may be constructed larger or smaller than the exhibit working model. The chambers may be mounted to fixed legs or, as shown in the working model, to a double trailer.