Chair with backrest and rotating damper device
AssigneeSugatsun Kogyo Co., LTD
InventorsOshima Kazuyoshi, Hiroyuki Masuda
Life of this patent
Estimating the term…
Abstract
A forward end part of an arm part 53 of a seatback frame is connected to a forward end part of a main frame 3 such that the forward end part of said arm part 53 can turn about a horizontal axis 61 extending leftward and rightward. A cam hole 71 is formed in a forward end part of the arm part 53. A shaft part 72 movably engageable with the cam hole 71 through a roller 73 is disposed at a forward end part of a seat frame 41. The cam hole 71, the shaft part 72 and the roller 73 constitute a positive motion mechanism 70 for causing a seat frame 41 to be tilted in accordance with the turning motion of the arm part 53.
Claims22
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 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 corporation 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).
A chair with a seatback comprising a seat (140) capable of tilting between a working position and a relaxing position, a seatback (150) capable of tilting in accordance with a tilting motion of said seat (140), and bias means (160) for biasing said seat (140) from the relaxing position side to the working position side,
- wherein said chair with a seatback further comprises a rotary damper (180) for restricting a high speed tilting of said seat (140) at least in one direction between the working position and the relaxing position.
A rotary damper comprising an apparatus main body (181) having a receiving hole (H), and a rotor (184) relatively rotatably inserted in said receiving hole (H), said apparatus main body (181) and said rotor (184) are provided with partition wall parts (181A, 181B;
- 184A, 184B) for dividing an annular space, which is formed between an inner peripheral surface of said receiving hole (H) and an outer peripheral surface of said rotor (184), in a circumferential direction and forming a plurality of pressure chambers (A, B), one (181A) of said partition wall parts (181A, 181B;
- 184A, 184B) including a pair of fixed wall parts (181b, 181c) which are disposed on either the inner peripheral surface of said receiving hole (H) or the outer peripheral surface of said rotor (184) such that said pair of fixed wall parts (181b, 181c) are located away from each other in a circumferential direction, and a movable wall part (185) circumferentially movably disposed at a receiving space (181a) formed between said pair of fixed wall parts (181b, 181c), a first communication path and a first flow-in path (181d) for communicating said receiving space (181a) with said pressure chamber (A) adjacent to one (181b) of said fixed wall parts (181b, 181c) being formed between said receiving space (181a) and said pressure chamber (A), a second communication path and a second flow-in path (181e) for communicating said receiving space (181a) with said pressure chamber (B) adjacent to the other fixed wall part (181c) being formed between said receiving space (181a) and said pressure chamber (B), when said movable wall part (185) is in abutment with said one fixed wall part (181b), said first flow-in path (181d) being closed but said second flow-in path (181e) being open, when said movable wall part (185) is in abutment with the other fixed wall part (181c), said first flow-in path (181d) being in open but said second flow-in path (181e) being closed, at least one of said first and second communication paths being provided with a resistor part (188) for generating resistance against the flow of fluid.
A chair with a seatback comprising a main frame (121), a seat (149) supported by said main frame (121), and a seatback (150) arranged at a location higher than a rear part of said seat (140) and supported by said main frame (121) through a support arm (162),
- wherein a pair of said support arms (162) are disposed one at a left and the other at a right, and said pair of support arms (162, 162) are elastically deformable so that when a user twisted his body with his back pressed against said seatback (150), said seatback (150) can turn in a horizontal direction following the twisting motion of the user's body.
A chair with a seatback according to claim 20, wherein said tilting mechanism (130) includes two pairs of front and rear turning links (133, 133;
- 131, 131) whose lower end parts are supported by said main frame (121) such that the lower end parts can turn about a horizontal axis extending leftward and rightward and whose upper end parts are connected to said seat (140) such that the upper end parts can turn about a horizontal axis extending leftward and rightward, a coiled spring is used as said return spring (160), and a pair of said coiled springs (160, 160) are arranged in a row between said pair of front turning links (133, 133).
Dependencies are inferred from the claim text.