Blower

Abstract

A blower ( 1 ) comprises a blast fan ( 20 ) provided within a casing ( 10 ), a driving unit ( 30 ) for rotationally driving the blast fan ( 20 ), a dust-proof cover ( 60 ) provided so as to cover an air intake ( 11 ) of the casing ( 10 ) and a drive stop mechanism ( 70 ) for stopping the driving unit ( 30 ). The drive stop mechanism ( 70 ) comprises a depressing lever ( 72 ) that depresses a pressure sensor ( 71 ) when it is pressed by a projection ( 65 b ) of the dust-proof cover ( 60 ) that is inserted into an attachment hole ( 12 ) of the casing ( 10 ) and a control section ( 73 ) for stopping the driving unit ( 30 ) when the pressure acting on the pressure sensor ( 71 ) from the depressing lever ( 72 ) decreases. This structure allows safety of the blower to be improved when the dust-proof cover ( 60 ) is removed from the air intake ( 11 ) and the air intake ( 11 ) is exposed to the outside because the rotation of the blast fan ( 20 ) automatically stops.

1 . A blower, comprising
 a blast fan provided within a casing,   a driving unit for rotationally driving the blast fan,   a blast duct for discharging an air flow generated by the rotating blast fan to an outside,   a dust-proof cover provided to cover an air intake formed in the casing and   a drive stop mechanism for stopping the driving unit,   wherein the dust-proof cover is attached to the casing by inserting a projection provided in the dust-proof cover into an attachment hole formed in the casing, and   wherein the drive stop mechanism comprises:   a pressure sensor provided in the casing;   a depressing lever having a first end in contact with a detecting part of the pressure sensor and a second end which is disposed in the attachment hole and is pressed by the projection that is inserted into the attachment hole so as to have the first end depresses the detecting part of the pressure sensor; and   a control section for setting up the driving unit into a drivable state if a pressure applied to the detecting part of the pressure sensor and for setting up the driving unit into a stop state if the pressure applied to the detecting part of the pressure sensor decreases.   
   
   
       2 . The blower according to  claim 1 , wherein the depressing lever has an intermediary portion of the depressing lever exposed to an the air intake and is formed to have the first end of the depressing lever presses the detecting part of the pressure sensor if the intermediate portion of the depressing lever is pressed by a suction pipe inserted into the air intake.