| 摘要 |
PURPOSE:To sensor even very small amount of wind by enabling a vane plate to move circumferentially on a pin with one side thereof fastened on the pin while the opposite side thereof is bent in the shape of L to have the pin pressing a microswitch with the action of the vane plate. CONSTITUTION:A plate having a microswitch 2 with a lever mounted thereon with a screw 3 is fastened on the ceiling side of a duct 1. A pin 5 runs straight through the duct 1 and extends upward outside the duct 1 so as to actuate the microswitch 2 with a lever. A vane plate 6 is within the duct 1 with the one side thereof fastened on the pin 5 while the opposite side is bent in the shape of L. As wind flows through the duct 1, the L-shaped vane plate 6 moves circumferentially in the same direction of the wind flow on the pin 5 and a part of the pin 5 outside the duct 1 turns in the opposite direction to actuate the microswitch with a lever. |
