Patent ID: 6705677
Filing Date: 2004-03-16
Classification: A47C,F16F

Abstract:
A chair with a seatback comprising a main frame (3), a seat frame (41) arranged at an upper side of said main frame (3), a seatback frame (51) whose forward end part is connected by a connecting portion (61) to a forward end part of said main frame (3) such that the forward end part can turn about a horizontal axis, thereby enabling a rear end part of said seatback frame (51) to be tilted between a working position and a relaxing position, a displacement mechanism disposed between the rear end part of said seat frame (41) and said seatback frame (51) and adapted to displace the rear end part of said seat frame (41) in an obliquely forward/backward direction in accordance with the turning motion of said seatback frame (51), and a positive motion cam mechanism (70) for displacing said seat frame (41) upward and downward, forward and backward and for tilting said seat frame (41) upward and downward in cooperation with said displacement mechanism,wherein said positive motion cam mechanism (70) is disposed between the forward end part of said seat frame (41) and the forward end part of said seatback frame (51), and said positive motion cam mechanism (70) is arranged at a rear of the connecting portion (61) at which the seatback frame (51) is turnably connected to the main frame (3).