Chair, in particular office chair

Claim 1

A chair, in particular office chair, comprising: a seat support (4) having a rear end; a seat (5) carried by said seat support (4); a back rest (8); and a rod-shaped back rest support (29) being part of the back rest (8) and being releasably connected with said rear end of said seat support (4); wherein a clamping device (32) is formed at said rear end of said seat support (4), which clamping device (32) has a receiving sleeve (33) which receives said rod-shaped back rest support (29) and which is clampable together to hold said rod-shaped back rest support (29); wherein said rod-shaped back rest support (29) has a lower end and a conical section (40) in the region of said lower end which conical section (40) tapers towards said lower end and wherein said receiving sleeve (33) has lateral walls (44, 45) which are adapted to said conical section (40); wherein said receiving sleeve (33) has a receiving section (41) which is similar to said conical section (40); wherein said receiving sleeve (33) is provided with retaining flanges (36) which protrude from said receiving sleeve (33) and which delimit an opening (34), which retaining flanges (36) are passed through by a clamping screw (42); and wherein said receiving sleeve (33) has a receiving section (41) which is similar to said conical section (40) and wherein said clamping screw (42) is disposed above said receiving section (41).