| 摘要 |
PCT No. PCT/SE90/00004 Sec. 371 Date Sep. 4, 1991 Sec. 102(e) Date Sep. 4, 1991 PCT Filed Jan. 3, 1990 PCT Pub. No. WO90/07991 PCT Pub. Date Jul. 26, 1990.A suction device for the removal by suction of waste gases or other environmentally harmful gases from a working location, e.g., from the exhaust pipe of an automotive vehicle, including a suction line which is connected to a central suction means or to a suction fan and one end of which is intended to be connected temporarily to, e.g., an exhaust pipe of an automotive vehicle or the like for the purpose of removing by suction exhaust gases deriving from the engine of the vehicle. In order to enable the suction line of such suction devices to be extended manually, even when the suction line is suspended vertically directly from a ceiling-mounted main suction line, the suction line is telescopic and a spring is mounted between the telescoping part of the suction line, such that the spring will be tensioned when the suction line is extended and therewith assist in restoring the suction line to its retracted state.
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