| 摘要 |
PURPOSE: An inlet has a shutter with good durability to secure reliability of operation. CONSTITUTION: An inlet comprises an inlet body(10), a shutter(20), a roller(30), a spring(40) and a stopper(50). The inlet body(10) has a suction hole formed thereunder and an opening formed in the middle of the front surface thereof and communicating with the suction hole. The shutter(20) is rotatably installed to the opening by an axis to open and close. The roller(30) is installed on the axis of the shutter(20) and rotates contacting with and rolling on a ground surface. The spring(40) transmits the rotary force of the roller(30) to the shutter(20) to rotate the shutter(20). The stopper(50) limits the rotating angle of the shutter(20). As the shutter(20) is rotated by the roller(30) rotating by contacting with and rolling on the ground surface, the rotation of the shutter is accurate. The gap between the shutter(20) and the ground surface is large enough to easily suck large dust in.
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