Abstract: Provided is an unprecedented chair in which a space between swinging surfaces facing each other can be appropriately hidden. The chair includes swinging surfaces (rolling surfaces) 312a and 322a facing each other, and has a configuration in which the swinging surfaces 312a and 322a swings with respect to each other in directions of 360 degrees including front-rear and left-right directions. In such a chair, an elastic member 33 is arranged to be positioned between the swinging surfaces 312a and 322a at least in the vicinity of outer peripheral edges 312z and 322z, and a stretchable sheet material 60 is provided between the outer peripheral edges 312z and 322z to conceal a gap between the swinging surfaces 312a and 322a facing each other, the gap including the elastic member 33.

Abstract: To realize a noble, useful seat with a simple structure designed to follow a natural movement of a seated person in front-rear and left-right directions and to support appropriately a movement of the person continuously changing its posture while the person balances a load. The seat includes the elastic support layer 3 and upper and lower base units 4 and 5 arranged to sandwich the elastic support layer 3. The upper base unit 4 includes the rolling surface 42e bulging toward the lower base unit 5 thereabove via the elastic support layer 3, is rollable in a 360° direction from the tilt reference position IRP in receiving a load of the seated person, and has a moving distal end side tilting more downward as a distance from the position IRP increases, and is configured to move while compressing the elastic support layer 3 by the rolling surface.

Abstract: A chair includes a leg 1, a seat 5 including a pressure receiving surface PS, a backrest 6, and a support mechanism SM. The seat 5 can move in the front-rear or left-right direction along a predetermined trajectory and to downwardly incline a tip side of the seat 5 in a movement direction in accordance with a movement of the seat 5 from a predetermined reference position (S). The support mechanism SM includes a return-force generation unit configured to generate, in accordance with an amount of movement, a return force in a direction in which the seat 5 moved from the reference position (S) in the front-rear or left-right direction is returned to the reference position (S), and movably supports the backrest 6 in the left-right direction together with a movement of the seat 5 in the left-right direction.

Abstract: A chair is realized which takes specific measures to suppress movement of a seat in a front-rear direction when the seat swings in the front-rear and the left-right directions with respect to a support base. For the purpose, the chair wherein a seat 5 swings in the front-rear and left-right directions with respect to a support base 2, the chair is configured such that swinging of the seat 5 in front-rear direction with respect to the support base 2 is capable of being suppressed at one or a plurality of predetermined positions, or arbitrary position via operation of operation member 152.

Abstract: A chair includes a leg 1, a seat 5 including a pressure receiving surface PS, a backrest 6, and a support mechanism SM. The seat 5 can move in the front-rear or left-right direction along a predetermined trajectory and to downwardly incline a tip side of the seat 5 in a movement direction in accordance with a movement of the seat 5 from a predetermined reference position (S). The support mechanism SM includes a return-force generation unit configured to generate, in accordance with an amount of movement, a return force in a direction in which the seat 5 moved from the reference position (S) in the front-rear or left-right direction is returned to the reference position (S), and movably supports the backrest 6 in the left-right direction together with a movement of the seat 5 in the left-right direction.

Abstract: To realize a noble, useful seat with a simple structure designed to follow a natural movement of a seated person in front-rear and left-right directions and to support appropriately a movement of the person continuously changing its posture while the person balances a load. The seat includes the elastic support layer 3 and upper and lower base units 4 and 5 arranged to sandwich the elastic support layer 3. The upper base unit 4 includes the rolling surface 42e bulging toward the lower base unit 5 thereabove via the elastic support layer 3, is rollable in a 360° direction from the tilt reference position IRP in receiving a load of the seated person, and has a moving distal end side tilting more downward as a distance from the position IRP increases, and is configured to move while compressing the elastic support layer 3 by the rolling surface.

Abstract: A chair according to the present invention is a chair comprising a leg 1 arranged on a floor surface, a leg support pole 13 erected from the leg 1, a support base 4 fixed at an upper end of the leg support pole 13, a seat 2 arranged above the support base 4 and a support mechanism 5 interposed between the support base 4 and the seat 2 and configured to support the seat 2 movably in a front-rear direction and a left-right direction. Additionally, in the support mechanism 5, a left-right support part 51 is attached to the support base 4 movably in a left-right direction, a front-rear part 52 is attached to the left-right support part 51 movably in a front-rear direction, the seat 2 is attached to the front-rear support part 51, and the support base 4 has an arm attachment part 6.

Abstract: A chair according to the present invention includes: a leg 1; a leg support pole 13; a support base 4; a movement mechanism 5 located below a seat 2, the movement mechanism 5 provided with plural movement parts 5A, 5B configured to allow the seat 2 to move in a certain area along a predetermined trajectory in a front-rear and left-right directions between the support base 4 and the seat 2, the movement mechanism 5 being a support mechanism configured to support the seat 2 so that the seat 2 moves in the front-rear direction and left-right directions; and plural cover members 71, 72 arranged corresponding to the plural movement parts 5A, 5B. The plural cover members 71, 72 are configured to move relatively in accordance with movement of the plural movement parts 5A, 5B and cover the support mechanism 5.

Abstract: [Problem] The present invention provides a chair and a cover member of the chair that include a cover which can appropriately maintain the appearance of the chair while preventing a sitting person from touching a movement mechanism moving below a seat at the time of movement of the seat or a backrest. [Means for Solving the Problem] A chair according to the present invention is provided with cover members 71, 72 for covering a movement mechanism 5 to support a seat movably at least one direction of front-rear direction and left-right direction, and is configured so that the cover members 71, 72 include a plurality of through-holes 71x, 72x arranged lengthwise and breadthwise.

Abstract: A chair is realized which takes specific measures to suppress movement of a seat in a front-rear direction when the seat swings in the front-rear and the left-right directions with respect to a support base. For the purpose, the chair wherein a seat 5 swings in the front-rear and left-right directions with respect to a support base 2, the chair is configured such that swinging of the seat 5 in front-rear direction with respect to the support base 2 is capable of being suppressed at one or a plurality of predetermined positions, or arbitrary position via operation of operation member 152.

Abstract: [Problem] The present invention provides a chair and a cover member of the chair that include a cover which can appropriately maintain the appearance of the chair while preventing a sitting person from touching a movement mechanism moving below a seat at the time of movement of the seat or a backrest. [Means for Solving the Problem] A chair according to the present invention is provided with cover members 71, 72 for covering a movement mechanism 5 to support a seat movably at least one direction of front-rear direction and left-right direction, and is configured so that the cover members 71, 72 include a plurality of through-holes 71x, 72x arranged lengthwise and breadthwise.

Abstract: A chair according to the present invention is a chair comprising a leg 1 arranged on a floor surface, a leg support pole 13 erected from the leg 1, a support base 4 fixed at an upper end of the leg support pole 13, a seat 2 arranged above the support base 4 and a support mechanism 5 interposed between the support base 4 and the seat 2 and configured to support the seat 2 movably in a front-rear direction and a left-right direction. Additionally, in the support mechanism 5, a left-right support part 51 is attached to the support base 4 movably in a left-right direction, a front-rear part 52 is attached to the left-right support part 51 movably in a front-rear direction, the seat 2 is attached to the front-rear support part 51, and the support base 4 has an arm attachment part 6.

Abstract: A chair according to the present invention includes: a leg 1; a leg support pole 13; a support base 4; a movement mechanism 5 located below a seat 2, the movement mechanism 5 provided with plural movement parts 5A, 5B configured to allow the seat 2 to move in a certain area along a predetermined trajectory in a front-rear and left-right directions between the support base 4 and the seat 2, the movement mechanism 5 being a support mechanism configured to support the seat 2 so that the seat 2 moves in the front-rear direction and left-right directions; and plural cover members 71, 72 arranged corresponding to the plural movement parts 5A, 5B. The plural cover members 71, 72 are configured to move relatively in accordance with movement of the plural movement parts 5A, 5B and cover the support mechanism 5.