| 摘要 |
A ventilating nozzle in which a tubular nozzle member is swivellable universally in a tubular housing. The nozzle member contains an obturating member adjustable to vary the effective flow of air through the nozzle member. A sleeve mounted on the nozzle member for relative rotation therebetween but restrained by the housing from rotational movement about its axis is connected by gearing to the obturating member, whereby rotational movement of the nozzle member within the sleeve will effect opening or closing of the obturating member according to the direction of the rotational movement.
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