| 摘要 |
An apparatus for sensing a rotational frequency of a drum in detail for a high place lighting lamp is provided to enable a worker to stop an elevator at a desired position accurately by sensing the rotational frequency of the drum accurately. A body is fixed to a ceiling. An elevation body turns on a lamp by being connected to the body electrically. A wireless remote control controls to lift up and down the elevation body. A wire is connected to the elevation body and a drum(70). A motor rotates to wind or unwind the wire around the drum. Connection ports are connected electrically by being formed on a bottom of the body and on a top of the elevation body. A sensing part(300) is formed on the side of the drum. A limit switch(200) senses a rotational frequency of the drum whenever the sensing part passes through a rotation roller(210). A circuit board stops the elevation body by rotating the drum. The sensing part comprises a circular plate(310) fixed to one side of the drum as rotating along the same direction as the drum, and a rugged groove(320) and a rugged part(330) sensing the rotational frequency of the drum accurately. |
