Patent ID: 7533939

Claim:
A chair including a height-adjustment assembly having a body supporting member which provides support to a chair occupant, said height adjustment assembly comprising: a support post projecting from said chair, said support post including a post wall defining a hollow interior thereof, said post wall including side cavities disposed in longitudinally spaced relation, which said side cavities open sidewardly into said hollow interior; a liner assembly comprising first and second liner sections which are longitudinally elongate and have a generally U-shaped cross-section wherein the liner sections include respective longitudinal edges and are disposed in opposite orientations so as to open sidewardly toward each other in an interconnected, edge-to-edge relationship, said interconnected first and second liner sections having a shape which corresponds to an interior shape of said support post so as to be fitted into said hollow interior in close fitting relation with said post wall, said first and second liner sections being formed of a reduced friction liner material, said first liner section including longitudinally spaced projections along one side thereof wherein said first liner section is configured to fit individually into said hollow interior with said projections fitting into said side cavities such that said first liner section is disposed in a fixed position within said hollow interior, said second liner section adapted to fit into said hollow interior separate from said first liner section wherein said first and second liner sections have cooperating interconnection parts which prevent said second liner section being removed from said hollow interior once said first liner section is disposed in position, said liner assembly further including longitudinally spaced locking recesses; and a slidable column assembly which supports said body supporting member on an exterior portion thereof, said column assembly including an elongate column that slidably fits within the hollow interior of said support post and is surrounded by said liner assembly so as to be slidably supported and movable along said reduced friction liner material, said column assembly including a lock assembly having a lock unit which is removably engagable with said locking recesses to define a releasably fixed position for said column assembly.