A drive apparatus of a chair assembly for a 4D theater according to the present disclosure includes: a lower plate which is in contact with the ground; an upper plate which is positioned above the lower plate so as to be spaced apart from the lower plate; a first actuator which is positioned at a left portion between the lower plate and the upper plate; a second actuator which is positioned at a right portion between the lower plate and the upper plate; and a spline device, in which the spline device is installed to be positioned on a vertical centerline of the lower plate, and the first actuator is installed to have a predetermined first angle with respect to a horizontal centerline of the lower plate.

An elevated mount chair includes: a base; a pair of arms; a seat positioned above the base between the arms; a backrest; a first ottoman; a reclining mechanism attached to the base, the seat and the backrest; and a footrest mechanism attached to the seat and the first ottoman, the footrest mechanism being coupled to the reclining mechanism. The seat includes a T-cushion positioned above a seat frame, the T-cushion having lateral wings that are positioned forward of the arms. The reclining and footrest mechanisms comprise a plurality of pivotally interconnected links configured to move the chair between an upright position, a TV position, and a fully reclined position. In moving between the upright, TV and fully reclined positions, a front portion of the seat experiences substantially no forward or rearward movement relative to the arms.

A device for moving the back and core muscles while sitting includes a rocking assembly that sits atop a base assembly, and optionally a height adjustment mechanism between the rocking assembly and the base assembly. The rocking assembly further includes a rocking mechanism that sits between a base plate or platform and a seat. The rocking mechanism can be, for example, a hollow or solid hemispheric- or dome-shaped rocking mechanism, an eccentric bicylinder rocking mechanism, and/or a rocking mechanism based on an arrangement of halfpipe members. The rocking mechanisms of the exercise chair allow to the seat to rock, wobble, and/or swivel with a side-to-side rocking motion, a front-to-back rocking motion, or both a side-to-side rocking motion and a front-to-back rocking motion.

A universal powered rocking system is disclosed with the ability to change between different styles and size chairs and different rocking motion styles in a single embodiment and with a unique mounting method to easily interchanging the universal powered rocking system with different chairs by a single user or permanently replace the feet or foundation of a chair. A universal powered rocking system with the ability to rock the chair while allowing the chair to use its original functions such as a pawl ratchet latching system and stationary style chair which have no means of manually rocking. A universal powered rocking system that the chair is constantly balanced on the rocking apparatus for operations and eliminates the jerky motion inherent to the linear motion.

A furniture member may include a base frame and a seat assembly mounted on the base frame. The seat assembly may include a seat frame, a seatback, a seat bottom, a rocker member, a legrest mechanism, and a tilt mechanism. The rocker member is attached to the seat frame and rollingly contacts the base frame. The rocker member supports the seat assembly relative to the base frame such that the seat assembly is movable between a rocked-back tilt position and a rocked-forward tilt position. The legrest mechanism is mounted to the seat frame and attached to a legrest platform. The legrest mechanism may include a drive rod coupled to a pantograph linkage that is movable relative to the seat frame between retracted and extended positions. The tilt mechanism selectively locks the seat assembly in one of an infinite number of tilt positions between the rocked-back and rocked-forward tilt positions.

The adjusting mechanism serves for the setting of a restoring force acting on the backrest of a chair. A back support and a seat support are fastened on a support. A setting mechanism configured in the manner of scissors is provided for the weight setting. Said setting mechanism has two scissor arms which are connected to one another via a scissor pin. One of said scissor arms is formed by a spring element and is fastened with its front-side spring end on said support. The back spring end is fastened on said scissor pin. Said first scissor arm is connected to said back support in the manner of a connecting rod. An active lever length is defined between said scissor pin and a support pin about which said back support is mounted pivotably. A compact construction mode is achieved by the configuration of said scissor arm as a spring element.

The present invention relates to a rocking chair, which comprises a chair framework and a chair cover installed on the framework, wherein arc-shaped bottom pipes, a back pipe, a seat frame pipe, front foot pipes, rear foot pipes, armrest pipes, armrest supporting pipes and connecting pipes are arranged on the framework; the back ends of the armrest pipes are rotatably connected with the middle part of the back pipe; the front ends of the armrest pipes are rotatably connected with the armrest supporting pipes; seat frame connecting pieces are fixedly arranged on the lower end of the back pipe which is rotatably connected with the rear part of the seat frame pipe and rotatably connected with the upper parts of the rear foot pipes through the seat frame connecting pieces; the lower parts of the rear foot pipes are rotatably connected with the rear parts of the arc-shaped bottom pipes; one end of the connecting pipe is rotatably connected with the rear foot pipes; the other end is rotatably connected with armrest fixing pieces and the front end of the seat frame pipe; one end of the front foot pipes is rotatably connected with the front parts of the arc-shaped bottom pipes; the other end is rotatably connected with the seat frame pipe through the armrest fixing pieces; the upper ends of the armrest supporting pipes are rotatably connected with the armrest pipes; the other end is rotatably connected with the armrest fixing pieces; a safety lock is positioned at the armrest supporting pipes and the armrest fixing pieces for locking the rotating freedom between the armrest supporting pipes and the armrest fixing pieces; and the front foot pipes and the rear foot pipes are rotatably connected with the arc-shaped bottom pipes directly for determining the rigidity and the stability of a bracket.

A chair has a supporting frame 1, a seat portion 101, a back portion 201 that has an upper end, a lower end, and is pivotally mounted relative to the supporting frame at a position above its lower end, and a recline mechanism 601. The recline mechanism 601 lifts the seat portion 101 upon a reclining action of the back portion 201, and has an operative connection 603, 611 between the seat portion and the supporting frame and a drag link 602 pivotally connected to the seat portion 101 and pivotally connected to the back portion 201 at a position below the pivotal mounting of the back portion relative to the supporting frame. As the back portion 201 of the chair is reclined, the lower end of the back portion 201 moves forward and the drag link 602 pulls the seat portion 101 upward relative to the supporting frame 1.

A chair has a supporting frame 1, a seat portion 101, a back portion 201 that has an upper end, a lower end, and is pivotally mounted relative to the supporting frame at a position above its lower end, and a recline mechanism 601. The recline mechanism 601 lifts the seat portion 101 upon a reclining action of the back portion 201, and has an operative connection 603, 611 between the seat portion and the supporting frame and a drag link 602 pivotally connected to the seat portion 101 and pivotally connected to the back portion 201 at a position below the pivotal mounting of the back portion relative to the supporting frame. As the back portion 201 of the chair is reclined, the lower end of the back portion 201 moves forward and the drag link 602 pulls the seat portion 101 upward relative to the supporting frame 1.

An improved tiltable stool comprises a seat, a body structure, and a base. The base comprises an annular elastic base member having a downwardly convex outer surface and a downwardly concave inner surface. Deformation of the annular elastic base causes a stabilizing force which pushes the tiltable stool towards a normal position when the tiltable stool or chair is tilted out of the normal position. The stabilizing force increases with the weight of a user and provides a consistent dynamic seating experience for users of different weights. An upper section of the annular elastic base is substantially cylindrical and firmly connected to the base structure. The downwardly convex outer surface of a lower section of the annular elastic base member rests on the floor. A contact area between the annular elastic base member and the floor is substantially ring-shaped, and grows outwardly with an increasing weight placed on the seat.