An adjustable chair comprising a seat part, a seat back disposed along one side of the seat part, the seat back being configured for supporting at least a person's back or shoulders, a chair base configured for being placed on a floor, at least one adjustable chair feature including a motor capable of being selectively controlled and driven so as to adjust at least one of: the rotation or tilt of the seat part, a vertical distance between the seat back and the one side of the seat part, an angle position between the seat back and the seat part, and a distance between the chair base and the seat part.

A mechanism for an office chair is structurally particularly simple and consequently comparatively inexpensive, but nevertheless extremely variable. Both the seat support and the backrest support are articulated by way of a common pivot axis. The seat support is connected in an articulated manner to the base support by way of at least one pivot bolt and is pivotable relative to the base support. The backrest support is connected in an articulated manner to the base support by way of the at least one pivot bolt and is pivotable relative to the base support.

A gas cylinder quick release device has a cylindrical upper assembly, a cylindrical lower assembly arranged below the upper assembly on a common axis, and a handle which is mounted to move between a first position and a second position. Movement of the handle from the first position to the second position imparts axial displacement of the upper and lower assemblies away from each other along the axis, thereby breaking a press-fit engagement of a wheelbase otherwise secured on the gas cylinder.

Novel sit-stand seating devices, more particularly, to sit-stand seats or stools that can tilt forward to provide balanced support for seated to near-standing postures and methods of their use are disclosed. The sit-stand devices are useful, inter alia, to provide stabilized worker positioning to carry out a task for a range of sitting through standing postures in an environment associated with a task for a worker in need thereof.

A chair footrest ring positioning structure includes a guide region tilting downward and concavely disposed on an outer surface of any one side of the lower segment of the tightening case, one or more anti-slip pads fixed inside an internal space of the tightening case, one or more grooves concavely disposed at a periphery of the tightening case, to facilitate insertion of a middle pipe of the chair, and a sleeve corresponding in shape to the middle of the footrest ring fitted around the tightening case. One or more bumps extending from an inner side of the sleeve are inserted into the grooves of the tightening case, respectively. When the middle pipe is rotated to move the tightening case by a predetermined distance, the guide region undergoes a displacement to drive insertion of the bumps, thereby pushing the tightening case inward.

A chair assembly includes a base assembly, a seat assembly having a pair of side edges and a fore-to-aft extending longitudinal centerline, a back assembly movable between upright and reclined positions, and an arm assembly including an arm base extending from a first location between the side edges to a second location laterally outward of one of the side edges, wherein the arm base extends at an acute angle with respect to the longitudinal centerline and at an upward angle from the first location toward the second location, a support assembly supported by and extending upwardly from the arm base, and an armrest supported by the support assembly that is adjustable to support the armrest between a plurality of selected vertical positions, wherein the arm assembly and back assembly move at a different rate from one another as the back assembly is moved between the upright and reclined positions.

The invention is directed to a base for pieces of furniture having at least one supporting column structure. The base comprises a central hub receiving the lower end of a column and a number of arms radiating from the hub. The object of the invention is to provide a furniture base which allows varying its height. This is accomplished by changing the angle between hub and arms, or by shifting the points of attachment of the arms on the hub in the vertical direction.

A base for a chair is described. The example base for the chair includes a central support coupled to a seat pan of the chair, a first pair of legs extending radially from the central support, and a second pair of legs extending radially from the central support. The first pair of legs extend in a direction opposite the second pair of legs. A first angle between the first pair of legs is larger than a second angle between the second pair of legs.

A chair back assembly includes a back shell member including laterally extending top, bottom and side portions cooperating to define an open space therebetween, where a portion of the back shell member is located in a lumbar region, a cover having a first surface and a second surface opposite the first surface, wherein the cover covers at least a portion of the open space, and a back frame assembly operably supporting the back shell member and movable between upright and reclined positions, wherein the back frame assembly causes the back shell to flex in a fore-to-aft direction as the back frame assembly is moved between the upright and reclined positions independent of an external force being exerted on the back shell member, and where the lumbar portion of the back shell member remains spaced from the back frame as the back frame is moved between the upright and reclined positions.

The present invention relates to a wireless speaker chair, and more particularly, to a wireless speaker chair capable of providing a sense of space and a three-dimensional effect to a user who sits in the chair through sounds output from a plurality of speaker channels and allowing the plurality of speaker channels to wirelessly receive sound signals and power which are received to output sounds.