Structure for supporting seat of height-adjustment chair

Abstract

A structure A for supporting the seat of a height-adjustable chair, the construction comprising leg members including a front leg unit 1 and an auxiliary leg 2 which are longitudinally disposed, and a bracket 4 having a front engagement piece 6 and a rear engagement piece 7 which are disposed in both of the front and rear sides of the leg members. When the bracket 4 is inclined rearward, it can be moved in the vertical direction along the leg members. When the bracket 4 is returned forward in a use state, the front and rear engagement pieces come into engagement with the leg members and the bracket 4 is fixed. A projection 13 is provided on a side face of the bracket 4. The projection 13 comes into contact with a side face of the leg member with a frictional action when the bracket 4 is inclined forward, and the contact is cancelled when the front side of the bracket 4 is lifted.

Dependencies are inferred from the claim text.