SUPPORT ARM ARRANGEMENT FOR A LOCAL GAS EXTRACTOR, AND A LOCAL GAS EXTRACTOR WITH SUCH A SUPPORT ARM ARRANGEMENT

摘要

The invention relates to a support arm arrangement (1) for a local gas extractor arrangement (87) and a local gas extractor arrangement (87), comprising such a support arm arrangement (1). The support arm arrangement (1) comprises a first support arm (3) and at least one second support arm (11) being pivotally coupled to each other by means of friction joint arrangements (13). The support arm arrangement (1) receives a tube device (81), coupled to an extractor hood (27), to an exterior pump device and to the support arms (3, 11). The extractor hood (27) is arranged at an outermost second support arm (11') by means of a linkage arm arrangement (39) comprising a first link arm (41), pivotally coupled to the outermost second support arm (1Γ) by means of first friction joint (43) pivotable about a first pivoting axis (45) and a second link arm (47), fixedly attached to the extractor hood (27) and being pivotally coupled to the first link (41) arm by means of a second friction joint (49) pivotable about a second pivoting axis (51) which extends in a direction perpendicular to the first pivoting axis (45).