Abstract:
A system for preventing rust in an automobile body comprising a system of removable plugs which permit the passage of air through certain body structure to prevent the accumulation of moisture or water.

Description:
BACKGROUND OF THE INVENTION 
     This invention is related to rust proofing systems for automobiles, and in particular, a system for encouraging air circulation through body parts which frequently accumulate moisture, water, or mud in inaccessible locations. 
     Automobile manufacturers construct bodies of thin steel of inexpensive alloy and then strengthen the shell by bracing compartment parts. Water condenses and accumulates in the compartments because they are not ventilated and the interior surfaces are uncoated and unpainted. Surface corrosion follows. 
     One conventional approach to this problem has been to apply internal preservatives in the body compartments. However, this method still leaves certain areas where traped moisture ultimately forms internal corrosion. For example, many vehicles have a bottom area forward of the front door in which moisture tends to rust out the body. Another vulnerable area is forward of the rear fender. 
     Another conventional solution has been to provide small bottom openings to permit water to drain, however, such openings are often so designed that water remains trapped in the bottommost part of certain vehicle cavities. Such openings often become plugged with foreign matter. 
     SUMMARY OF THE INVENTION 
     The broad purpose of the present invention is to provide removable plugs that encourage the passage of air through certain internal automobile body structures to prevent the accumulation of moisture and water. In the preferred embodiment of the invention, which will subsequently be described in greater detail, a plurality of removable plugs are mounted in appropriately located openings in the body structure. The plugs permit the passage of air for removing moisture from the body structure. 
     The plugs are removable to permit drainage of water trapped in the body because of blocked drain passages. The removable plugs permit the vehicle owner to easily remove the plugs and flush out the internal body compartments to remove any foreign matter trapping water. 
     Still further objects and advantages of the invention will be readily apparent to those skilled in the art to which the invention pertains upon reference to the folllowing detailed description. 
    
    
     DESCRIPTION OF THE DRAWING 
     The description refers to the accompanying drawing in which like reference characters refer to like parts throughout the several views, and in which: 
     FIG. 1 is a view of an automobile having removable plugs mounted in accordance with the preferred embodiment of the invention; 
     FIG. 2 is a view of a door having the preferred plugs mounted thereon; 
     FIG. 3 is an enlarged cross-sectional view through a typical plug mounted in a vertical wall opening; 
     FIG. 4 is a view taken along lines 4--4 of FIG. 3; 
     FIG. 5 is a view taken along lines 5--5 of FIG. 3; 
     FIG. 6 is an enlarged cross-sectional view through a bottom plug; and 
     FIG. 7 is a view taken along lines 7--7 of FIG. 6. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to the drawing, FIG. 1 illustrates an automotive vehicle 10 having body structure 12. Body structure 12 includes door structure 14 and horizontal molding 15. The body structure is formed of a sheet metal which tends to rust out if not adequately protected. 
     To protect automobile 10 from rust due to moisture and water, a plug 16 is removably mounted forward of the rear wheel fender, and a plug 18 is removably mounted just forward of the door. Many automobiles rust in these locations because of trapped moisture. The rust action begins on the inside of the sheet metal body structure and progresses outwardly. 
     Referring to FIG. 2, door 14 has plugs 20 and 22, and a bottom plug 24. Each of the plugs 16, 18, 20, 22, and 24 are removable from their respective locations to permit the user to flush out any foreign deposits that may be internally contained within a body compartment. 
     Two types of plugs are employed. One is illustrated in FIGS. 3-5 and the other in FIGS. 6-7. Each plug is removable because it can be reduced to a diameter less than the opening in which the plug is mounted. 
     Plugs 16, 18, 20, and 22 are identical and illustrated in FIGS. 3-5. Referring to FIG. 3, typical plug 22 includes a circular external portion 23 mounted on molding 15 adjacent opening means 28. The diameter of plug portion 23 is greater than the diameter of opening means 28. Portion 23 is formed of a resilient material with a plurality of louvers 30 formed to open in response to air pressure being greater on one side of the louvers than on their opposite side. The louvers close when the pressure on both sides of the wall is balanced. 
     Plug 22 has an internal portion 32 adjacent opening means 28. Portion 32 is formed such that its diameter is reduced by either pushing into the opening, or removing it from the body. Portion 32 has three slits 34. 
     The louvers are formed such that when mounted in an external location on the vehicle, the user can rotate the plugs so that the louvers receive air which is then forced through the slits into the internal body portion and create a positive air flow. For example, in FIG. 1, the louvers are directed toward the forward part of the vehicle so that as the vehicle is moving in its forward direction, air is received between the louvers to create a positive air flow. 
     Similarly, by mounting a pair of plugs on a body structure, such as at 20 and 22, in FIG. 2, the creation of a positive flow of air from one side edge of door 14 toward the opposite side edge tends to remove any accumulation of moist air and thus reduces the tendency of such moisture to condense and form water. 
     Referring to FIGS. 6 and 7, bottom plug 24 is located in the bottom of the door to drain water received into the door structure. Bottom plug 24 is seated in opening 36 in bottom wall 38. Plug 24 includes an internal body portion 40 having a diameter greater than the diameter of opening 36, and engaging wall 38 closely adjacent opening 36. Plug 24 has an external body portion 42 connected to portion 40, adjacent opening 36. Plug 24 is formed of a resilient material that allows the user to remove the plug from the opening. External portion 42 also has a small opening 44 aligned with an opening 46 in internal body portion 40. 
     Referring to FIG. 7, portion 40 also has a pair of slots 48 and 50. Slots 48 and 50 each extend from the perimeter of body portion 40 inwardly along the diameter of the body to opening 46. They provide means for water to drain along the internal surface of wall 38 and thereby prevent any water from being trapped in the bottom of the door structure. 
     Plug 24 can be easily removed from the bottom opening and the interior of the door structure flushed out after extremely wet weather to remove any corrosive materials, such as salt and the like, that may have accumulated in the body. Plug 24 also permits air to pass into the door structure and thereby promote air circulation to prevent any moisture from accumulating in the body and contributing to rust. 
     The louvers in plugs 20 and 22 permit the user to flush water through the plugs without removing the plugs. The plugs are made in different sizes to accomodate the thickness of the structure in which they are mounted. For example, some plugs are mounted in only a sheet metal opening while others are mounted in a position where the opening is through both the body sheet metal and a molding member.