Patent ID: 8678748

Claim:
A blower fan unit comprising: a housing having an outlet opened on a peripheral surface of the housing and an inlet opened on a surface other than the peripheral surface of the housing; a fan to generate airflow from the inlet to the outlet, the fan being arranged in the housing; a support unit including a support shaft to support the housing so that the housing is rotatable around the support shaft; an exhaust tube projecting from the outlet, the exhaust tube producing a reaction force by guiding the airflow toward an upstream side of movement of the peripheral surface synchronized with rotation of the housing, the reaction force rotating the housing toward a downstream side of the movement of the peripheral surface of the housing; a stopper being positioned on a movement path of the exhaust tube that moves with the rotation of the housing to stop the rotation of the housing by blocking movement of the exhaust tube; and a switch mechanism to switch blocking and restarting of the movement of the exhaust tube using the stopper, wherein the stopper includes a first arm that extends from the support shaft toward the peripheral surface of the housing and is rotatable around a center axis of the housing, and a second arm that is coupled with the first arm and projects on the movement path of the exhaust tube, wherein the switch mechanism is a releasable brake that stops the rotation of the first arm.