| 摘要 |
PURPOSE:To improve workability on a working table unit, by a method wherein a guide frame, guiding a shutter divided into a plurality of pieces along the lengthwise direction of a working space, is fixed to only the outside between shutters neighbored to a ceiling unit. CONSTITUTION:A side part of a ceiling unit 12 is equipped with a pair of shafts 28a and a spiral balancer spring 28b whose one end is retained to the shaft 28a via a backet 28 and the other end is attached to both sides of the upper part of a frame work 27b, and a shutter 27 is held at an arbitrary position by the resilient force of the spring 28b. A guide frame 29 is fixed to only the outside between shutters 27 neighbored to a ceiling unit 12 and a groove 29a, suitable for the frame work 27b of the shutter 27, is formed along both side ends at both sides in the direction of the height thereof to guide the opening and closing of the shutter 27. Said guide frame 29 is provided with a length substantially the same as the height of the shutter 27 or the ceiling unit 12, therefore, the guide frame is projected only to the upper position of a working space. A guide apparatus 29 is attached to only the ceiling unit 12; therefore, the guide frame 29 will never become obstacles against a worker.
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