| 摘要 |
The invention relates to an arrangement in chairs of the kind having a central pillar (4) carrying a seat provided with a back support, and coacting with a base structure (1) including at least three feet (2) consisting of supporting members (5) integral with, and projecting transversely from, a central sleeve (3) accommodating said pillar, the free end portions (6) of the members (5) projecting a given distance from the sleeve (3) and having fastening means (7) for wheels or carrying means (10) bearing against a floor or other substructure. At least one extension piece (8) is removably mountable on the means (7) of the supporting members (5) instead of the originally mountable or mounted wheels or carrying means (10) for achieving greater spread of said means (10) and mitigation of the risk of tipping with the chair in question, when it is provided with extra equipment, e.g. a neck rest.
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