A chair can include a chair back, or backrest, that is coupled to a base of a chair above a seat of the chair. A tilt mechanism can attach the backrest to the base at spaced apart locations. In some embodiments, the tilt mechanism can be configured so that the backrest rotates about multiple pivots as it reclines from an upright position to a reclined position to drive forward motion of the seat during recline of the backrest.

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.

A flange part 31b is provided on a vertical surface 31a on the plate member PM of the front-rear swing part 3, the flange part 31b has a guide surface 31b1 extending to lateral direction and moving the rolling body 45 in the longitudinal direction, a lateral direction dimension of the guide surface 31b1 is greater than a thickness of the plate member PM, the flange part 31b and the portion of the plate member PM forming the vertical surface 31a around the flange part 31b are integrally formed of metal; and the flange part 31b has a shape that goes around the circumference of the guide hole 34 opened in the vertical surface 31a, and then, the rolling body 45 are provided independently to the left and right, to be able to a roll along the guide surface 31b1.

A swing chair includes a base, a seat, and a driving frame. The seat is disposed above the base. The driving frame is disposed between the base and the seat. The driving frame includes a first fixing base, a first shaft, a second fixing base, a second shaft, a first driving assembly, and a second driving assembly. The first fixing base is fixed to the base. The first shaft is rotatably connected to the first fixing base. The second fixing base is fixed to the seat. The second shaft is connected to the first shaft and the second fixing base is rotatably connected to the second shaft. The first driving assembly is configured to drive the first shaft to rotate with respect to the first fixing base. The second driving assembly is configured to drive the second fixing base to rotate with respect to the second shaft.

A balance chair, comprising a seat, an in substance vertical height element supporting the seat, and a base supporting the height element and seat, distinctive in that the balance chair comprises a rotation and tilt element, arranged in a position in substance midway between the seat and a lower end of the base.

A balance chair, comprising a seat, an in substance vertical height element supporting the seat, and a base supporting the height element and seat, distinctive in that the balance chair comprises a rotation and tilt element, arranged in a position in substance midway between the seat and a lower end of the base.

Adjustment device (1) for a chair which is provided with a rocking mechanism composed of a first plate (2), which is fixed to a central gas-operated post (7) for the height adjustment of a seat and to which a second plate (10) is articulated, about a first axis (9) that is transverse thereto and so that it can rock, the second plate being fixed to a seat or being integral with a seat and interacting with means (8a, 8b) which are adapted to contrast the rocking of a backrest. A first cable (12) is slideably associated with the first plate (2) and is adapted to activate a lever (13) which is articulated internally to the first plate (2) at a different second axis (14) and is adapted to activate the height adjustment of the seat. A second cable (20) is further slideably associated with the first plate (2) and is adapted to activate a mechanism (21) which allows or prevents the rocking of the second plate (10).

The present invention relates to a swivel chair tray, and more particularly relates to a spiral adjusting swivel chair tray for changing the angle of a torsion spring. The present invention mainly solves the technical problems existing in the prior art, for example, the swivel chair tray cannot adjust the angle of the torsion spring, so the adjustment degree of the seat cannot be changed and the operation is relatively inconvenient. The present invention includes a base plate, wherein the base plate is connected to a middle seat through a shaft. The middle seat is fixedly provided with a tapered tube through a tapered tube pad. A torsion spring is sleeved over the shaft, and the torsion spring is connected to an adjusting mechanism for adjusting the angle of the torsion spring through a torsion spring fixing block.

The present invention relates to a swivel chair tray, and more particularly relates to a spiral adjusting swivel chair tray for changing the angle of a torsion spring. The present invention mainly solves the technical problems existing in the prior art, for example, the swivel chair tray cannot adjust the angle of the torsion spring, so the adjustment degree of the seat cannot be changed and the operation is relatively inconvenient. The present invention includes a base plate, wherein the base plate is connected to a middle seat through a shaft. The middle seat is fixedly provided with a tapered tube through a tapered tube pad. A torsion spring is sleeved over the shaft, and the torsion spring is connected to an adjusting mechanism for adjusting the angle of the torsion spring through a torsion spring fixing block.

The invention relates to a chair (1) which comprises a support (6), a seat element (5), a back element (4), a leg element (3), a spring mechanism and a weight-controlled working adjusting element for the spring mechanism.