Stackable fan

Abstract

An air blowing system is disclosed having top and bottom air blowers that each includes a blower base and a blower housing tiltable relative thereto, and a coupling for enabling pivotable affixation of the top blower base to the bottom air blower, The air blowing system has at least first and second operational modes, whereby in the first operational mode the coupling does not affix the top blower base to the bottom air blower and the bottom and top air blowers are relatively independent, and in the second operational mode the coupling pivotably affixes the top blower base to the bottom air blower.

We claim: 
     
         1 . An air blowing system comprising:
 a bottom air blower having a bottom blower base and a bottom blower housing;   a top air blower having a top blower base and a top blower housing tiltable relative thereto;   a removable coupling for enabling pivotable affixation of the top blower base to the bottom air blower;   wherein the air blowing system has at least first and second operational modes, whereby;   in the first operational mode, the removable coupling does not affix the top blower base to the bottom air blower and the bottom and top air blowers are relatively independent; and   in the second operational mode, the removable coupling pivotably affixes the top blower base to the bottom air blower.   
     
     
         2 . The air blowing system of  claim 1  wherein;
 the top and bottom air blowers each comprise a power cord adapted for connection to a household power outlet for energizing the associated blower housing; and 
 the bottom air blower comprises a bottom power outlet; wherein 
 during the first mode, each power cord is independently connectable to a household power outlet; and 
 during the second mode, the power cord of the bottom air blower is connectable to a household power outlet and the power cord of the top air blower is connectable to the bottom power outlet. 
 
     
     
         3 . The air blowing system of  claim 2  wherein each of the top and bottom blower bases comprises a foot portion having two separated supports projecting upwardly there-from to form a yoke that defines a horizontal tilt axis, and wherein each of the top and bottom blower housings is tiltably affixed to the associated blower base at the horizontal tilt axis and is tiltable relative to the associated blower base thereabout. 
     
     
         4 . The air blowing system of  claim 3  wherein each of the top and bottom blower housings comprises a motor driven axial fan blade for driving airflow through and from the associated blower housing. 
     
     
         5 . The air blowing system of  claim 4  wherein each of the top and bottom air blowers has a control for varying the airflow from the associated blower housing. 
     
     
         6 . The air blowing system of  claim 5  wherein the top and bottom air blowers are substantially identical. 
     
     
         7 . The air blowing system of  claim 6  wherein the removable coupling is rigidly affixable to an underside of the top blower base and comprises a round neck portion protruding downwardly to and pivotably receivable by a top side of the bottom blower housing. 
     
     
         8 . The air blowing system of  claim 7  wherein the top side of the bottom blower housing comprises a locking screw for selectably engaging the coupling to allow or deny pivoting of the coupling to thereby allow or deny relative pivoting between the top and bottom air blowers. 
     
     
         9 . The air blowing system of  claim 1  wherein the bottom blower base is adapted for mounting to a vertical wall. 
     
     
         10 . The air blowing system of  claim 9  wherein the bottom blower base is so adapted for mounting to a vertical wall by keyholes comprised in an underside thereof. 
     
     
         11 . The air blowing system of  claim 1  wherein the bottom blower base is tiltable rearwardly relative to the bottom blower housing into a semi-fixed angular position whereby a bottom edge of the bottom blower housing and a front edge of the bottom blower base lie on a horizontal resting plane when the bottom blower housing is substantially vertically disposed. 
     
     
         12 . An air blowing system comprising:
 a bottom air blower having a bottom blower base and a bottom blower housing;   an intermediary air blower having an intermediary blower base and one or more intermediary blower housings;   a top air blower having a top blower base and a top blower housing tiltable relative thereto;   a plurality of removable couplings for enabling pivotable affixation of the intermediary blower base to the bottom air blower and pivotable affixation of the top blower base to the intermediary air blower;   wherein the air blowing system has at least first and second operational modes, whereby;   in the first operational mode, none of the plurality of removable couplings affix the top blower base to the intermediary air blower or affix the intermediary blower base to the bottom air blower and the bottom, intermediary, and top air blowers are relatively independent; and   in the second operational mode, one of the plurality of removable couplings pivotably affixes the top blower base to the intermediary air blower and another of the plurality of removable couplings pivotably affixes the intermediary blower base to the bottom air blower.   
     
     
         13 . The air blowing system of  claim 12  wherein;
 the top, intermediary, and bottom air blowers each comprise a power cord adapted for connection to a household power outlet for energizing the associated blower housing; 
 the bottom air blower comprises a bottom power outlet; and 
 the intermediary air blower comprises an intermediary power outlet; wherein 
 during the first mode, each power cord is independently connectable to a household power outlet; and 
 during the second mode, the power cord of the bottom air blower is connectable to a household power outlet, the power cord of the intermediary air blower is connectable to the bottom power outlet, and the power cord of the top air blower is connectable to the intermediary power outlet. 
 
     
     
         14 . The air blowing system of  claim 13  wherein each of the top, intermediary, and bottom blower bases comprises a foot portion having two separated supports projecting upwardly there-from to form a yoke that defines a horizontal tilt axis, and wherein each of the top, intermediary, and bottom blower housings is tiltably affixed to the associated blower base at the horizontal tilt axis and is tiltable relative to the associated blower base thereabout. 
     
     
         15 . The air blowing system of  claim 14  wherein each of the top, intermediary, and bottom blower housings comprises a motor driven axial fan blade for driving airflow through and from the associated blower housing. 
     
     
         16 . The air blowing system of  claim 15  wherein each of the top, intermediary, and bottom air blowers has a control for varying the airflow from the associated blower housing. 
     
     
         17 . The air blowing system of  claim 16  wherein the top, intermediary, and bottom air blowers are substantially identical. 
     
     
         18 . The air blowing system of  claim 17  wherein one of the plurality of removable couplings coupling is rigidly affixable to an underside of the top blower base and comprises a round neck portion protruding downwardly to and pivotably receivable by a top side of the intermediary blower housing, and another of the plurality of removable couplings coupling is rigidly affixable to an underside of the intermediary blower base and comprises a round neck portion protruding downwardly to and pivotably receivable by a top side of the bottom blower housing. 
     
     
         19 . The air blowing system of  claim 18  wherein the top sides of the bottom blower housing and the intermediary blower housing both comprise a locking screw for selectably engaging the associated coupling to allow or deny pivoting of the associated coupling to thereby allow or deny relative pivoting between the associated air blowers. 
     
     
         20 . The air blowing system of  claim 12  wherein the bottom blower base is adapted for mounting to a vertical wall. 
     
     
         21 . The air blowing system of  claim 12  wherein the bottom blower base is tiltable rearwardly relative to the bottom blower housing into a semi-fixed angular position whereby a bottom edge of the bottom blower housing and a front edge of the bottom blower base lie on a horizontal resting plane when the bottom blower housing is substantially vertically disposed. 
     
     
         22 . An air blowing system comprising:
 substantially identical first and second air blowers each having;
 a base comprising a foot portion with two separated supports projecting upwardly there-from to form a yoke that defines a horizontal tilt axis, 
 a blower housing tiltably affixed to the base at and tiltable relative to the base about the horizontal tilt axis, and comprising an axial fan having a fan blade driven by an electric motor when energized for forcing airflow through and from the blower housing; 
 a NEMA-type power cord; 
 a control switch electrically disposed between the power cord and the electric motor for selectably allowing or denying energy to the electric motor; 
 a NEMA-type power outlet electrically connected to the power cord; and 
   a removable coupling selectably affixable to an upper portion of the first air blower and a lower portion of the second air blower for enabling selectable pivotable connection of the first and second air blowers such that the air blowing system has first and second operational modes; whereby   in the first operational mode, the coupling is removed and does not affix the first and second air blowers, and the first and second air blowers are relatively independently operable by connecting the power cords to different NEMA-type power supply outlets; and   in the second operational mode, the removable coupling connects the upper portion of the first air blower to the lower portion of the second air blower and the power cord of the second air blower is connected to the power outlet of the first air blower and the air blowers thereby cooperate to form a single air blowing assembly having two distinct airflows selectable directable in different directions.