To provide a chair in which the seated person can perceive a comfortable sitting feeling even if sitting for a long time, and furthermore a high work efficiency can stably be maintained, a chair according to the present invention includes a support mechanism 2 interposed between a leg 1 and a seat 3, wherein the support mechanism 2 includes: a seat inclining mechanism Q as a seat inclining function configured to downwardly incline a tip side in an operation direction of the seat 3 when the seat 3 operates from a predetermined reference position (S), and further includes: a return-force generation mechanism configured to generate, in accordance with an amount of movement, a return force in a direction of returning the seat 3 having moved from a reference position (S) in a front-rear or left-right direction, to the reference position (S).

A chair comprises: a leg 1 erected on a floor surface; a seat 3 arranged above the leg 1; and a support mechanism 8 interposed between the leg 1 and the seat 3, wherein the support mechanism 8 is arranged below the seat 3 and is configured to movably support the seat 3 along a predetermined trajectory by having an omnidirectional connection unit 72 configured to operably connect in all directions including the front-rear direction and the left-right direction, comprises: a seat inclining function configured to downwardly incline a tip side in a movement direction of the seat 3, and further comprises: a return-force generation mechanism configured to generate, by elevating a center of gravity of the seat 3, a return force in a direction of returning the seat 3 to the reference position.

A seating furniture includes a seat with a seat surface, a pedestal and a tilt mechanism. The tilt mechanism is disposed between the pedestal and the seat and permits an inclination of the seat surface of the seat relative to the horizontal. In addition, the tilt mechanism has a lower bearing block mounted to the pedestal, and an upper bearing block fixedly connected to the seat. The lower bearing block has a convexly curved lower bearing surface on its upper side facing the upper bearing block, and the upper bearing block has a concavely curved upper bearing surface on its lower side facing the lower bearing block. The lower and upper bearing surfaces have substantially corresponding radii of curvature, so that the upper bearing block can be moved relative to the lower bearing block along the upper bearing surface. A tilt mechanism for seating furniture is also provided.

[Problem] Provided is a chair capable of changing an operation of a movable part between allowed and suppressed states, without causing an up-down movement of a seat or without requiring a complicated structure relying on a back.

[Solution] For that purpose, a weight-receiving part 50, the height position of which changes due to a person sitting on a seat surface, is provided on a seat 5, the change of the height position is mechanically transmitted to a control mechanism 8X configured to control an operation of a front-rear swing part 3 being the movable part, and the control mechanism 8X changes an operation of the front-rear swing part-3 being the movable part between allowed and suppressed states.

A chair includes a seat pan member, a movement support frame, and at least two movement support members operatively connected to the seat pan member and the movement support frame. The at least two movement support members are configured to support the seat pan member in a floating manner for dynamic movement with respect to the movement support frame in at least one degree of freedom in a horizontal seating plane.

A chair includes a seat pan member, a movement support frame, and at least two movement support members operatively connected to the seat pan member and the movement support frame. The at least two movement support members are configured to support the seat pan member in a floating manner for dynamic movement with respect to the movement support frame in at least one degree of freedom in a horizontal seating plane.

A base seat, which is adapted for being used with a bed, a chair or a sofa, includes a fixation base, a first rocking mount disposed above the fixation base and driven by a first drive device to reciprocatingly swing back and forth relative to the fixation base, a second rocking mount disposed above the first rocking mount and driven by a second drive device to reciprocatingly swing from side to side relative to the first rocking mount, and a swivel mount disposed above the second rocking mount and driven by a third drive device to rotate about an imaginary vertical axis. As such, the base seat can swing back and forth, swing from side to side, and rotate, independently or simultaneously.

In view of various movement of a seated person, when giving the left-right swinging operation to the seat in the non-conventional aspect, a chair configured such that the back can perform a new movement suitable for the left-right movement of the seat and return to the predetermined position when the seated person leaves a seat, is realized.

For the purpose, a back 6 is arranged behind a seat 5, and the back 6 has an operation mechanism 6M turning-movably supporting the load received from a seated person in a left-right direction in a front view, and when the load is applied, at least a part of guide part 65a, 66a of the operation mechanism 6M is separated and the back moves freely, and when the applied load is removed, the back automatically returns to the neutral position along the guide part 65a, 66a.

A collapsible chair may be supported by a base. A slider receptacle may be mounted on the base and comprise two arched slider receiving areas. Each arched slider receiving area may be shaped as an arched guide, track or hollow cylinder suitable for receiving two arched sliders, where each arched slider may be inserted and adjustably moved by hand in one of the two arched slider receiving areas. Moving the arched sliders towards a front of the collapsible chair reclines the collapsible chair while moving the arched sliders towards a rear of the collapsible chair raises the collapsible chair. The collapsible chair may also have two back rest poles and two seat poles that create the frame of the collapsible chair. A material may be extended between distal ends of the two back rest poles and two seat poles to create a seating area of the collapsible chair.

A zero gravity chaise chair includes a seat frame providing a head rest, a back, a bottom and a leg rest, a first bow member connected to one side of the seat frame, a second bow member connected to the other side of the seat frame, a first rolling guide connected to the first bow, a second rolling guide connected to the second bow, and a base connected to the first rolling guide and the second rolling guide. A motor may operate the first rolling guide to vary incline position of the seat frame. The motor may be algorithmically controlled to vary incline position of the seat frame such as to aid blood flow and minimize pressure points of a body positioned on the seat frame.