| 摘要 |
<p>The invention relates to devices of a controlling passage type. The movable guardrail comprises a bar 2 which is fixed rotatably to an immovable load-bearing structure 1 and to which at least one door 3 is rotatably fixed, and a synchronizing mechanism consisting of a single gear 4 fixed immovably relative to the immovable load-bearing structure, gears 5 fixed immovably relative to the corresponding doors, and gears 6 fixed to the bar between the above-mentioned single gear 4 and corresponding gear 5, which is immovable relative to the door.</p> |
