| 摘要 |
The invention relates to an adjustable device for the extraction of gas, smoke, dust and the like, comprising a flexible hose 2, an articulated arm, consisting of an elongated upper arm 1, an elongated lower arm 7 and an intermediate joint. The upper arm 1 is connected to the hose 2 at a substantial distance from the joint and the coupling is constituted by a universal joint 16 which allows the lower arm 7 to swing out in two perpendicularly opposed planes. The lower arm 7 is connected at its free end to the hose 2 and the lower arm is provided with a rotary coupling 9, allowing movement of the hose 2 around the upper arm. <IMAGE> |
