Patent ID: 8118366
Filing Date: 2012-02-21
Classification: A47C

Abstract:
1. A chair comprising a three-dimensional frame and a seat with lockable height pivotally attached to the frame, wherein there is a shortened back rest with lockable height to support the a user's vertebral column; the back rest is installed at an angle of less than 90° between its working surface plane and the seat working surface plane; the distance between the top edge of the back rest working surface and the seat plane is less than 250 mm, and the seat is tiltable forward both above and below its horizontal plane, and is provided with an arresting device; and there is a smooth displacement compensator of the seat and a reset mechanism installed between the chair frame and the seat, wherein the range of a seat tilt angle is limited by substantially −4° and +16° with respect to the horizontal plane, and wherein the seat tilt angle is determined by a position of a center of gravity of a person sitting on the seat relative to a seat pivotal mount axis on the frame.