| 摘要 |
<p>PURPOSE:To improve the operability and safety of an electrical equipment used in a chamber by leading out a cable for power feed from a ceiling and controlling the quantity of the expansion and contraction of the cable so that tension is kept constant. CONSTITUTION:A cable 5 for power feed is surrounded by a cylinder 4 composed of an unbending member and led out of a ceiling surface 1, and a connector 6 with an electrical equipment 15 is installed at the nose of the cable 5. A control switch 40 for the cylinder 4 and the cable 5 is mounted onto a wall surface. The cable 5 is wound on a drum 7, and led out or rolled in by turning the drum 7. A wire 9 is wound on a drum 10 and length is shortened on nonuse in the cylinder 4. The change of tension applied to the cable 5 is detected according to the movement of the electrical equipment 15 connected to the cable 5, and the quantity of the expansion and contraction of the cable 5 is controlled. Accordingly, the cable 5 is not sagged, and excess tension is not applied, thus preventing hang-up to furniture, etc., and the slip-off of a connecting section.</p> |
