Net device for smoke exhauster

Abstract

A smoke exhauster includes a housing having one or more openings formed in a bottom plate and having three or more protrusion extended from the bottom plate and arranged around the opening of the housing, and one or more fan devices engaged in the housing. A net device includes an outer peripheral frame, an inner peripheral frame, and a number of ribs extended between the outer peripheral frame and the inner peripheral frame, the outer peripheral frame is detachably engaged with the protrusions for allowing the net device to be attached to the housing without fasteners. The protrusions each may include one or more notches for receiving the outer peripheral frame of the net device.

1 . A smoke exhauster comprising: 
 a housing including a bottom plate having at least one opening formed in said bottom plate, and including a first protrusion, a second protrusion and at least one third protrusion extended from said bottom plate and arranged around said at least one opening of said housing,    at least one fan device engaged in said housing and disposed above said at least one opening of said housing, and    a net device including an outer peripheral frame, an inner peripheral frame, and a plurality of ribs extended between said outer peripheral frame and said inner peripheral frame, said outer peripheral frame being detachably engaged with said first and said second and said at least one third protrusions for allowing said net device to be attached to said housing without fasteners.    
   
   
       2 . The smoke exhauster as claimed in  claim 1 , wherein said first and said second and said at least one third protrusions each include at least one notch formed therein for receiving and engaging said outer peripheral frame of said net device.  
   
   
       3 . The smoke exhauster as claimed in  claim 1 , wherein said first and said second protrusions each include two notches formed therein, and said net device includes two net members having said outer peripheral frame received and engaged in said notches of said first and said second protrusions.  
   
   
       4 . The smoke exhauster as claimed in  claim 3 , wherein said first and said second protrusions are disposed opposite to each other.  
   
   
       5 . The smoke exhauster as claimed in  claim 1 , wherein said housing includes a peripheral swelling extended upwardly from said bottom plate for forming said at least one opening of said housing, and said first and said second and said at least one third protrusions are extended from said peripheral swelling.  
   
   
       6 . The smoke exhauster as claimed in  claim 5 , wherein said housing includes a peripheral groove formed in said peripheral swelling for forming an inner peripheral wall and an outer peripheral wall.  
   
   
       7 . The smoke exhauster as claimed in  claim 6 , wherein said ribs of said net device are inclined downwardly and outwardly from said inner peripheral frame toward said outer peripheral frame.  
   
   
       8 . The smoke exhauster as claimed in  claim 5 , wherein said housing includes a casing having a lower panel secured to said bottom plate, and having said peripheral swelling extended upwardly from said lower panel of said casing for forming said at least one opening of said housing.  
   
   
       9 . The smoke exhauster as claimed in  claim 1 , wherein said first and said second and said at least one third protrusions are equally spaced from each other.