Blower structure

Abstract

A blower structure constituted by a rotating head composed of a protective annular band which is provided with a blunt circumferential outer flap and is connected, by way of two or more blades, to a support, the latter being constituted by a flat base from which a propeller cuff protrudes below, it being possible to key the flat base onto a motorized head of a brush cutter, each one of the blades having a shape structure that is adapted to obtain an air flow oriented toward an axis of the flat base in a direction of the propeller cuff.

What is claimed is: 
     
         1 . A blower structure, constituted by a rotating head composed of a protective annular band which is provided with a blunt circumferential outer flap and is connected, by way of two or more vanes, to a support which is constituted by a flat base from which a propeller cuff protrudes below, said flat base being keyed onto a motorized head of a brush cutter, each one of said blades having a shape structure that is adapted to obtain an air flow oriented toward an axis of said flat base in a direction of said propeller cuff 
     
     
         2 . The blower structure according to  claim 1 , wherein said protective annular band has a lower end, an upper perimetric edge, and an inner lateral surface, said blunt circumferential outer flap protruding externally from said lower end and having a substantially U-shaped cross-section, and being associated with or welded to laterally or below said lower end of said protective annular band. 
     
     
         3 . The blower structure according to  claim 1 , wherein a height of said support is substantially equal to that of said protective annular band and is substantially contained therein. 
     
     
         4 . The blower structure according to  claim 1 , wherein said flat base is provided axially and centrally with a hole, in order to allow the positioning within said hole of a pin which protrudes from said motorized head which is present at an end tip of a frame, provided with two grips, of a brush cutter which comprises an engine assembly for the transmission of motion to said motorized head. 
     
     
         5 . The blower structure according to  claim 1 , wherein in said hole it is possible to arrange a pin which protrudes from said motorized head which can be accommodated within a cavity which is provided on said flat base concentrically to said hole, said pin being externally threaded for connection to a complementarily threaded nut which can be accommodated within a complementarily shaped seat which is provided on said propeller cuff coaxially to said hole. 
     
     
         6 . The blower structure according to  claim 1 , wherein each one of said blades has a first, upper point of attachment arranged proximate to or at an outer perimetric edge of said flat base or at a lateral surface of said propeller cuff, subsequently each one of said blades having an extension that brings it to rise upwardly, higher than the plane of arrangement of said flat base, and therefore also said upper perimetric edge of said protective annular band, in order to then descend downwardly in the direction of said inner lateral surface, until it connects at or proximate to said upper perimetric edge of said protective annular band. 
     
     
         7 . The blower structure according to  claim 6 , wherein each one of said blades has a second, lower point of attachment arranged proximate to or at said outer perimetric edge of said flat base or at said lateral surface of said propeller cuff, subsequently each one of said blades having a shape structure that brings it to descend downwardly in the direction of said inner lateral surface, until it connects proximate to or at said lower end of said protective annular band. 
     
     
         8 . The blower structure according to  claim 1 , wherein the flow of air generated overall by said blades of said rotating head is arranged substantially according to a cylindrical canalization.