| 摘要 |
<p>The smoke-extractor has a frame on which a flap (3) is hinged (5) and swiveled by means of an erection unit (4) one of the two ends of which is swivel mounted in a support (6) held by a cross-bar (8) fixed to the frame. The other end of the erection-unit is attached to the flap. The support consists of two bars (9) fixed to lengthwise struts (10) of the cross-bar and which enclose the erection-unit. The bars contain lengthwise slots (11) into which fit adjacent mounting-bolts (13)on the underside (15) of the erection-unit.</p> |
