Engine-driven blower/dust collector

Claim 1

An engine-driven blower/dust collector comprising: an engine (1) having a shaft (2); a fan (3) directly connected to said shaft (2); a fan case (4) accommodating said fan (3); a partition wall (7) dividing the internal space of said fan case (4) in the axial direction of said shaft (2) into two sections (5 and 6) and having an opening (8) opposing to the central portion of said fan (3), the axially outer section (5) constituting a suction chamber for said fan (3) while the axially inner section (6) constituting a discharging chamber for said fan (3); an opening surface (11) having openings (9 and 10) arranged in a common plane and communicated with said suction chamber (5) and discharge chamber (6), respectively, said opening surface (11) being formed in the peripheral wall of said fan case (4); an air-switching slide pipe (12) slidable on said opening surface (11) in the axial direction of said shaft (2) so as to select one or both of said openings (9, 10) in said opening surface (11); and means for connecting a dust sucking pipe (13), dust collecting bag (15) or the like to nozzles (20 and 21) communicating to openings (9', 10') of said air-switching slide pipe (12) corresponding to said openings (9, 10) of said opening surface (11).