Blower

Abstract

A blower includes a motor, a fan, a casing, a control circuit, a roll pin, and a boss portion, and an end face of the boss portion at one side inserted to the shaft is provided with a groove having an opening and an bottom part to engaged with the roll pin, side walls of the groove are slanted to widen from a bottom part to the opening, the side walls have straight portions formed to confront each other in parallel to a longitudinal direction of the shaft and extending toward the opening from a start point corresponding to a central axis of the roll pin, and a distance between the confronting straight portions is equal to a diameter of the roll pin.

1 . A blower comprising:
 a motor;   a fan driven by the motor;   a casing that covers a circumference of the fan;   a control circuit that drives and controls the motor;   a cylindrical roll pin mounted on a shaft of the motor at right angle to an axis line of the shaft; and   a boss portion inserted into the shaft,   wherein an end face of the boss portion at one side inserted to the shaft is provided with a groove having an opening and a bottom part engaged with the roll pin, side walls of the groove are slanted to widen from the bottom part to the opening, the side walls have straight portions formed to confront each other in parallel to a longitudinal direction of the shaft and extending toward the opening from a start point corresponding to a central axis of the roll pin, and a distance between the confronting straight portions is equal to a diameter of the roll pin.   
     
     
         2 . The blower according to  claim 1  further comprising one pair of integrated holding units that hold the shaft and one pair of integrated pressing units that are pressed to move the holding units, wherein the shaft has a concave slot engaged with the holding units, a curved surface of the shaft having the concave slot is a chamfered C-shaped surface, and a dimension of the C-shaped surface in a longitudinal direction of the shaft is equal to a length of the straight portion.