Dynamic air deflector
This is a Continuation-in-part of application Ser. No. 674,932 filed Nov. 26, 1984, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates to an air deflector adapted to be mounted over a register in a forced air heating or air conditioning system. 
     It is common practice to mount an air deflector over a register in a heating or air conditioning system. The deflector usually comprises a transparent plastic housing with a pair of side walls and a curved rear wall that re-directs the upwardly flowing air coming from the register laterally into the room. A simple static deflector of this type is inefficient as the air, being at a relatively low pressure, is not projected with any force into the room and in the case of warm air quickly rises to the ceiling, where its warmth cannot be utilized. 
     A static air deflector also has no provision for reducing any odors in the outflowing air. 
     SUMMARY OF THE INVENTION 
     An object of the invention is to alleviate the aforementioned disadvantages. 
     Accordingly, the present invention provides an air deflector comprising a housing having a pair of laterally spaced, vertical side walls and a sloping rear deflector wall, said housing having an open bottom for mounting over an air register and an open front extending to the bottom of the housing for discharging air into a room, and a roller mounted in said open front for rotation about a horizontal axis between said side walls, said roller having a plurality of circumferentially equispaced fins extending therealong, each fin being curved radially outwardly such that in its uppermost position it defines a concave surface facing towards the rear, said rear deflector wall defining with the roller a flow path extending over the top of the roller, whereby the roller is set in rotation by the air flow to project air out of the top of the deflector at an increased velocity and thereby over a greater distance into the room. 
     In a preferred embodiment, the roller is hollow with perforations along its length and a solid deodorizer, such as a deodorizer stick mounted inside. 
     Such a deflector fills a room with cool or warm air more evenly and efficiently. Instead of the air flowing nearly straight upwards, the deflector maintains air flow across the room. The deodorizer can be added as an added benefit for personal use. Deodorized, heated or cooled air can then be expelled to any specific area of the room. 
     The deflector should be placed on the register to direct the air where required. Magnets on the bottom enable the deflector to be mounted on any air register in the correct manner, with virtually no air escaping from the sides. 
     The deflector according to the invention also propels air out faster and farther than the static deflector of the prior art. 
     This action can result in quicker heating or cooling and a saving on furnace/air conditioning units and expenses. The provision of the deodorizer in the rotating roller is a particularly effective way of deodorizing the outflowing air. 
    
    
     DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an elevation partly in section of one embodiment; 
     FIG. 2 is a side plan view of this embodiment; and 
     FIG. 3 is a section of line III--III of FIG. 1. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     In the drawings, the air deflector comprises a housing with an open bottom 15 adapted to be fitted over an air register 12 of a forced air heating/air conditioning system and an open front 14 for projecting air into a room. The housing 13 has two side walls 1 and a sloping rear deflector wall 3 terminating at its forward end in forwardly and downwardly inclined lip 16 extending over the front of the housing 1. Magnets 4 are attached to the lower edges of side walls 1 to magnetically hold the housing on the air register 12. The side walls 1 also have protrusions 3 to locate the deflector properly at the front of the air register 12. 
     Hollow roller 5, which has six equally spaced curved fins 6, with the uppermost fins concave towards the rear, is mounted for rotation about a horizontal axis between side walls 1. For this purpose, stub shafts 17 are mounted in opposed holes 10 in the side walls 1. 
     Roller 5 has perforations 7 for releasing deodorized scent from an internal stick of deodorant 8. Deodorant stick 8 is held in place by end caps 9 on the roller. End caps 9 are glued to the ends of roller 5 and include the stub shafts 17. The roller 5 rotates freely about its horizontal axis. 
     In operation, air enters the housing from the register 12 through the open bottom 15 and is deflected forwardly by the sloping rear wall 2 before striking the roller. The air sets the roller in clockwise rotation, flowing over the top of the roller as shown by arrow 18 and out through the front of the housing to be projected laterally into the room at increased velocity. The lip 16 serves to confine the flow path around the top of the roller and increases the efficiency of the unit. 
     The presence of the roller greatly increases the velocity of the air coming out of the deflector and therefore the distance over which the air is projected into the room. The roller reduces the effective size of the front opening of the housing, thus increasing the air flow velocity, but without introducing the flow resistance that would be caused by a simple restriction in the opening. 
     The housing 13 is made of resilient plastic to enable the roller to be readily replaced by a new roller containing a fresh deodorizing stick by merely forcing apart the side walls.