| 摘要 |
<p>PURPOSE:To automate the driving and stopping of a telescopic pole by installing a built-in switch which automatically opens and closes, using a relative rotation between a winding drum which gives telescopic motion to telescopic poles like a corner pole and the center gear which drives the winding drum. CONSTITUTION:When an indoor switch 1 is changed over, for an example to an up-side each contact point, P1 and P2, are connected so that the electric current from a battery B is flown to each contact point, P1 and P2, a motor M, a relay contact point S and a contact point b. The motor M therefore rotates clockwise to extend a telescopic pole. When the telescopic pole is extended to its full length, a built-in switch SW2 is turned on and a light emitting diode D2 lights up simultaneously. As the electric current from the battery B flows to the contact point P1, a relay coil L, the built-in switch SW2 and the diode D2, a relay R is turned on to switch over the relay contact point S to a contact point a. As the result, both ends of the motor M are short-circuited to stop the motor M.</p> |
