An elevation hinge where one of the parts moves in connection to a guiding means on another part, and wherein a supporting effect is achieved on an elevation of said moving part. The elevation hinge comprises a first part including at least one guiding means, and a second part including at least one connection element for guiding the second part along the at least one guiding means. The guiding means includes a second portion adapted for guiding the connection element to and from a first portion. Guidance is performed in a linear manner or in a rotational and linear manner, in relation to the first part. A spring is fixed between a connection element and an anchor pin on the first part.

Disclosed herein is a back support including armpit support parts. The back support including armpit support parts includes: a main body having horizontal accommodation grooves and vertical accommodation grooves; and armpit support parts positioned at the main body to support the armpits of a user and accommodated in the horizontal accommodation grooves, wherein each armpit support part includes: a base load installed at the main body; and an armpit support connected to the base load to support the armpits of a user, the armpit support parts vertically rotate with respect to the main body, and the base loads horizontally rotate with respect to the main body, and thus the armpit support parts are accommodated in the horizontal accommodation grooves.

A chair for providing seating support to a user and for providing ways for the user to perform exercises. The chair includes a back support that is flexible such that when a force is applied to it by the user's body, the back support bends. The back support may be configured to adapt to the curvature of the user's spine when the user is seated in the chair. The back support may further be configured such that the user can rotate the back support by rotating the user's upper body.

The present application provides an armrest rotating mechanism suitable for being installed on an armrest tube and a frame. The armrest tube is rotatably connected to the frame. The armrest rotating mechanism includes an engagement device and an operation device. The engagement device is disposed between the armrest tube and the frame. Via the engagement device, the armrest tube can be positioned relative to the frame. The operation device is disposed on the armrest tube and connected with the engagement device. When the operation device is rotated, the engagement device is driven by the rotated operation device so as to disengage the armrest tube from the frame. Therefore, the armrest tube is adjustable relative to the frame and has a simple structure and utility convenience.

A stadium chair has a seat frame and a backrest frame pivotally coupled to the seat frame for rotation about an axis parallel to a rear portion of the seat frame. The backrest frame is capable of forward rotation about the axis toward the seat frame and rearward rotation about the axis away from the seat frame. A biasing element coupled to either the seat frame or the backrest frame causes forward biasing of the backrest frame toward a neutral position relative to the seat frame. The biasing element allows for limited rearward rotation of the backrest frame from the neutral position and allows for forward rotation of the backrest frame from the neutral position. The chair preferably is configured to receive optional rotatable armrests that may be installed or removed without the use of tools.

An apparatus that supports a tattoo artist in a variety of positions to comfortably apply one or more tattoos to skin of a subject is herein disclosed. The apparatus can be reconfigured to optimally position and support the arms and/or chest of the tattoo artist. A method for using a tattoo stool can involve rotating armrests of the apparatus from a stowed position to a deployed position. The armrests can support the user's forearms while supporting the user's chest such that the user can comfortably tattoo a portion of the subject positioned in front of the stool.

A medical chair with height adjustable armrest comprises a lifting mechanism, a base coupled to a bottom end of the lifting mechanism, a backrest part rotatably coupled to an upper end of the lifting mechanism, and an armrest rotatably coupled to the backrest part and adjustable to at least one position. The armrest comprises a supporting part, a horizontal axle, and a latch system moving slidingly on the horizontal axle or rotatably around the horizontal axle. The latch system comprises a latch coupled to a control element and a guide tube, which is slidingly coupled to the horizontal axis by a guiding pin. The latch system further comprises a first stop of the armrest and a second stop on an upper end of an arm and a third stop on the horizontal axle, wherein the third stop is located on the horizontal axle between the upper end of the arm and a frame or the backrest part.

An apparatus that supports a user in a variety of positions to comfortably perform tasks, such as applying one or more tattoos to skin of a subject is herein disclosed. The apparatus can be reconfigured to optimally position and support the arms and/or chest of the user. A method for using a stool can involve rotating armrests of the apparatus from a stowed position to a deployed position. The armrests can support the user's forearms while supporting the user's chest such that the user can comfortably perform tasks in front of a chest support of the stool.

A chair. Left and right adjustable swing arms are attached to the chair back and each is moveable between a rest position at about 90 degrees relative to the chair back and an extended position at about 180 degrees relative to the chair back. The left and right adjustable swing arms each further comprise an arm rest and an arm rod. Each rod defines a first segment and a second segment at 90 degrees relative to the first segment. The first segment of each arm rod is disposed longitudinally within the left arm and right arm rests. A left and a right swing arm support is attached to the chair back with the second segment of each arm rod is pivotably mounted to the respective left and right swing arm supports to allow the left and right swing arms to pivot between the rest position and the extended position.

Seating assemblies and methods are disclosed. A seating assembly can comprise a seat, a back support, and a frame component. The frame component can extend from a bottom portion, positioned near an underside of the seat, to a top portion, configured to maintain the back support at a position above the seat. The back support can laterally extend from a left edge portion to a right edge portion and can include a spring member at or near each of the left and right edge portions. The spring member can include at least one undulation or are providing integrated compression adaptation to a user. The seating assembly can further comprise a tilt mechanism, engaged with the frame component, including one or more leaf springs and a spring contact assembly. The spring contact assembly can be positioned on a top side of the one or more leaf springs.