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.

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 tiltable chair includes a fixing base having a tiltable housing. A gas cylinder inside the tiltable housing reciprocates in upward and downward directions. A seat plate is on top of the gas cylinder. And an elastic tiltable member is inside the fixing base accommodates a longitudinal lower part of the gas cylinder so the gas cylinder moves tiltably about a vertical axis to the bottom of the fixing base. A fixed frame is on the bottom of the fixing base, a coupling frame is inside the center portion of the fixed frame to accommodate the gas cylinder therein, and a rubber packing is between the fixed frame and the coupling frame and deformed elastically in every direction. The rubber packing has tilt concave grooves formed inward to a given depth from top and underside reduced in width toward the insides thereof to form inclined surfaces.

A tiltable chair includes a fixing base having a tiltable housing. A gas cylinder inside the tiltable housing reciprocates in upward and downward directions. A seat plate is on top of the gas cylinder. And an elastic tiltable member is inside the fixing base accommodates a longitudinal lower part of the gas cylinder so the gas cylinder moves tiltably about a vertical axis to the bottom of the fixing base. A fixed frame is on the bottom of the fixing base, a coupling frame is inside the center portion of the fixed frame to accommodate the gas cylinder therein, and a rubber packing is between the fixed frame and the coupling frame and deformed elastically in every direction. The rubber packing has tilt concave grooves formed inward to a given depth from top and underside reduced in width toward the insides thereof to form inclined surfaces.

A body support assembly includes a seat assembly and backrest assembly supported by a tilt control assembly. Methods of using and assembling the body support assembly are provided.

A support base for a tilting seat having a coupling body, a support body having a central portion, and a plurality of flexible components that are structurally separable and elastically yielding is provided. The flexible components are arranged between the coupling body and the central portion and meet in compression according to oscillations of a piston rod of the tilting seat.

A support base for a tilting seat having a coupling body, a support body having a central portion, and a plurality of flexible components that are structurally separable and elastically yielding is provided. The flexible components are arranged between the coupling body and the central portion and meet in compression according to oscillations of a piston rod of the tilting seat.

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 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 chair assembly includes an arm assembly that includes an armrest supported by a vertically adjustable support assembly and an arm base, where the arm base extends at an acute angle with respect to a longitudinal centerline of the chair assembly, an upholstery arrangement including a ring member attached to a cover, where the ring member includes a plurality of reliefs having a width that reduces as the ring member is wrapped about a shell member of the chair assembly, and a control arrangement having a biasing member that moves through an arcuate path as the biasing member is adjusted between varying bias settings.