| 摘要 |
<p>1. A device for the extension of a ventilating duct (5), which consists, arranged one behind the other in the direction of the flow of air, of a funnel (3), an interchangeable ventilating duct store (2) and a nozzle or a further duct, and in which the ventilating duct (5) runs out of the ventilating duct store (2) over the funnel (3) which is connected detachably to the store (2), a ring (4) being fitted at the free end of the funnel (3) for the guidance of the ventilating duct (5), characterized in that the ring (4) is fastened detachably to the funnel (3) and that the extent of the ring (4) in the axial direction is adequate for tightly clamping two ends of ventilating duct adjoining one another.</p> |
