| 摘要 |
PROBLEM TO BE SOLVED: To avoid injuring the user's body, etc., even if contacted there, while reducing weight and size by making the vane of polyurethane and providing a string or rope to a part of the fan body. SOLUTION: This portable fan to be worn around the neck is structured with a rotary vane 2 made of polyurethane, and a rope 3 attached to a fan body 1. The number of vanes on the rotary vane 2 of the fan is specified to be three taking the wind force and load on motor into consideration, and the shape of the rotary vane 2 to be semi-circular with considering wind force efficiency. Further, the angle of the rotary vane 2 relative to the longitudinal axis of the fan body is effectively specified to be 10 to 15 deg.. The rotary vane 2 is a set of three blades, and pinched by rotary vane fixing parts 4, 5. The length of the rope 3 is, since the fan is designed to be worn around the user's neck, appropriately specified to be 1 m as one piece. Moreover, since the rotary vane 2 is made of polyurethane, even if the motor speed is constant, wind force can be adjusted by changing the angle of the rotary vane 2 by hand.
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