Abstract: A chair backrest swing structure includes a chassis connecting seat, a backframe connecting seat and an elastic buffer and reset member. The chassis connecting seat is configured to be cooperatively mounted with a chassis. The backframe connecting seat is configured to be cooperatively mounted with a backframe. The backframe connecting seat is rotatably cooperated with the chassis connecting seat. The elastic buffer and reset member is configured to enable that the backframe connecting seat may implement buffer and reset when swung left and right on the chassis connecting seat.

Abstract: A chair includes a seat surface and a laterally pivotable backrest. The backrest is secured to two joints, which have mutually parallel axes of rotation.

Abstract: The invention relates to a chair, in particular an office chair, comprising a seat surface and a laterally pivotable backrest, wherein the backrest is secured to two joints, which have mutually parallel axes of rotation.