| 摘要 |
PURPOSE:To select optionally the position of an operation swtich which includes a transmitter for generating an ultrasonic wave controlling the wall equipment by making a connection between a wall type equipment and the operation switch through a connection pipe of detachable structure for ultrasonic wave transmission. CONSTITUTION:An ultrasonic wave receiver in a wall type electric fan 1 is connected to the ultrasonic wave signal transmitter 3 which uses batteries as its power source through the pipe 2 made of synthetic resin. The transmitter 3 is provided with a off switch 3 which stops the rotation of the electric fan and switches 5, 6, and 7 which adjusts the electric fan to a high, an intermediate, and a low air capacity, and ultrasonic waves of different frequencies are sent into the pipe 2. The connection pipe 10 of the electric fan 1 is provided with a tapered part 12 which prevents the reflection of the ultrasonic waves, and the pipe 2 is relatively soft and extensible while inserted into the connection pipe 10 easily, and fixed to the connection pipe 10 by the contracting force of the pipe. The pipe 2 is cut easily to optional length, so the operation switch is installed at an optional position. |
