The armrest structure includes a connecting seat having a sleeve. A height adjustment rod is disposed in the sleeve and has two symmetric boards. Each of the boards is formed with recesses. A receiving room is formed between the two boards. An elevation rod is disposed in the sleeve. An end of the elevation rod has a projection received in the receiving room. Another end of the elevation rod has a connecting seat with a cylinder and a spring. An armrest set has a tube and an armrest connected atop the tube. The tube is received in the sleeve and sheathes the height adjustment rod and elevation rod. A top of the tube is formed with a channel for receiving a trigger. A fixing bar passes through the projection and is embedded into one of the recesses.

A chair back assembly includes a substantially rigid peripheral frame defining a central opening, and a substantially flexible back shell coupled to the peripheral frame and spanning at least a portion of the central opening, wherein a first portion of the back shell is fixed with respect to the frame at a first position, a second portion of the back shell is fixed with respect to the frame at a second position that is different than the first position, a third portion of the back shell is constrained with respect to the frame in at least one direction of motion at a third position located between the first position and the second position, and wherein a fourth portion of the back shell is free from constraint with respect to the frame at a fourth position located between the third position and the second position.

The present invention relates to a chair equipped with supporter for shoulder which can obtain an effect of attitude remedy by reducing the pressure applied to the spine and by inducing an upright attitude of erecting the waist vertically through the supporter for shoulder which is connected to the hip supporter through the base and which comprises the supporter for armpit provided above the supporter, and in addition which can maximize convenience and enable the multi-purpose use by selecting the use and non-use of the supporter for arm or the supporter for shoulder through the direction change through up-down or forward-rearward direction rotation of the supporter for arm or through the folding of the supporter for armpit of the supporter for shoulder through the rotation shaft.

The chair equipped with supporter for shoulder according to the present invention comprises: a base; a hip supporter provided above the base; a supporter for shoulder comprising a supporter connected to the base and protruding to both sides of the hip supporter, and a supporter for armpit provided above the supporter; and a supporter for arm connected to the base and provided below the supporter for armpit.

A rotating armrest apparatus includes a handle, a rotating device disposed at one end of the handle, an elevation adjustment device disposed at another end of the handle, and a rotatable armrest disposed on top of the elevation adjustment device.

An armrest device for a chair includes a lower support rod that rises at a side of a chair seat and has a tubular upper end portion; and an upper support cylinder that has an armrest provided in an upper end thereof, is externally fitted to the lower support rod so as to be slidable in an up-down direction, and has a plurality of engaging portions therein. The armrest is made height-adjustable with respect to the lower support rod by disposing the locking member and a biasing member at an upper end portion of the lower support rod and providing the rotating rod inside the lower support rod.

The invention includes a connecting seat having a sleeve. A height adjustment rod is disposed in the sleeve and has two symmetric boards. Each of the boards is formed with recesses. A receiving room is formed between the two boards. An elevation rod is disposed in the sleeve. An end of the elevation rod has a projection received in the receiving room. Another end of the elevation rod has a connecting seat with a cylinder and a spring. An armrest set has a tube and an armrest connected atop the tube. The tube is received in the sleeve and sheathes the height adjustment rod and elevation rod. A top of the tube is formed with a channel for receiving a trigger. A fixing bar passes through the projection and is embedded into one of the recesses.

The utility model discloses a comfortable chair suitable for multiple usage postures. An overturnable desk board is arranged on a chair backrest, and a desk board adjustment mechanism can fix the angle of the desk board and support the desk board. The chair is provided with overturnable chair armrests, and armrest angle adjustment mechanisms can adjust the angle of the armrests, so as to provide users with various usage postures, realizing high flexibility and practicality. Embedded armrests are also arranged on the chair armrests and can be equipped with matching small desk boards. With embedded armrest adjustment mechanisms, the embedded armrests can be adjusted in both height and forward/backward position, so as to cater to users of different body types and heights.

An armrest frame capable of being collapsed conveniently is provided. The armrest frame capable of being collapsed conveniently includes an armrest frame set, scissor sets, and a locking unit, where the scissor sets are provided between the armrest frames, the scissor sets drive the armrest frames to move close to or away from each other, the scissor sets each include crisscross hinged scissor arms, and two ends of each of the scissor arms are respectively hinged to the corresponding armrest frames. The armrest frame set is used to replace the existing fixed wood frame or metal frame. In the armrest frame set, one armrest frame is fixed, while the other armrest frame is movable. The movable armrest frame can move relative to the fixed armrest frame through the scissor set, such that an armrest of a sofa can be expanded or collapsed.

The utility model discloses a comfortable chair suitable for multiple usage postures. An overturnable desk board is arranged on a chair backrest, and a desk board adjustment mechanism can fix the angle of the desk board and support the desk board. The chair is provided with overturnable chair armrests, and armrest angle adjustment mechanisms can adjust the angle of the armrests, so as to provide users with various usage postures, realizing high flexibility and practicality. Embedded armrests are also arranged on the chair armrests and can be equipped with matching small desk boards. With embedded armrest adjustment mechanisms, the embedded armrests can be adjusted in both height and forward/backward position, so as to cater to users of different body types and heights.