Patent ID: 7296855

Claim:
A chair, comprising a chair body; a rest; an adjusting mechanism for adjusting a height of said rest in a direction of a vertical relative to said chair body, said adjusting mechanism including at least one securing element which is solidly connected to said chair body on one end of said adjusting mechanism and which has a free end with an end portion with a substantially vertically oriented slot, a threaded bolt extending through said slot and screwable into a thread in said rest, and a hand wheel to which said threaded bolt is rigidly connected, so that securing of said rest to said end portion of said securing element in clamping fashion is effected; a clamping sleeve located between said hand wheel and said end portion of said securing element and having a throughbore through which said threaded bolt reaches in an assembled state and an end face oriented toward said end portion of said securing element, and a diameter of said end face in a direction perpendicular to a longitudinal axis of said clamping sleeve is greater than a width of said slot; a plurality of successive detent elements provided along said slot in a surface of said end portion towards said hand wheel and lockingly engageable by said end face of said clamping sleeve, at least one element selected from the group consisting of said clamping sleeve and said detent recesses of said end portion having at least one oblique face; and a pressure-generating device which in the assembled state with said threaded bolt screwed in, builds up a pressure force between said hand wheel and said clamping sleeve and includes at least one force component parallel to said longitudinal axis of said clamping sleeve.