An exercise chair includes a seat assembly, a backrest, a movable supporting member, a position-limiting device, and a resilient position-restoring element. The backrest is pivotally connected to a pivotal connection portion of the seat assembly. The movable supporting member includes a roller for contact with the ground and is pivotally connected to the backside of the backrest. When the tilted state of the backrest is changed, the movable supporting member changes the position at which the ground is in contact with the roller, lest the exercise chair tip over backward. The position-limiting device is connected between the pivotal connection portion and the movable supporting member to adjust and limit the aforesaid contact position. Should the position-limiting device fail, a second position-limiting device provided on the backrest can prevent the exercise chair from falling backward. The resilient position-restoring element helps restore the exercise chair to its most compact configuration.

An ergonomic massage chair is configured with back and bottom structures held up by a pair of legs. The various support bars and structure of the ergonomic massage chair may be comprised of, in typical implementations, metal, but plastic and other suitable structures are also possible. The back structure has perimeter support bars that form the base of the back support, and horizontal support bars extend from a left perimeter support bar to a right perimeter support bar. The bottom structure likewise has a perimeter support bar that forms the structure of the bottom. A horizontal support bar extends from a left perimeter support bar to a right perimeter support bar. Nodes are attached to the ergonomic chair, and stability balls fit inside openings created by the support bars and nodes. A cover having memory foam pillows therein encapsulates the chair to provide users with customized setups that suit them.

A multifunctional chair includes a support body, a telescopic structure, a seat body and a pedal assembly. The pedal assembly includes a fixing rod, a movable rod, an operating element and an elastic resistance element. The telescopic structure is connected with the support body, and the telescopic structure can be operated to move telescopically relative to the support body. One end of the fixing rod is fixed to the support body. The movable rod is movably connected with the fixing rod. The operating element is located at the end of the movable rod. Two ends of the elastic resistance element are respectively connected to the support body and the fixing rod. When the movable rod and the fixing rod are rotated toward the ground by pressing the operating element, the elastic resistance element can provide elastic resistance accordingly, so that the user can perform related muscle training exercises.

Disclosed are a chair device and a star-shaped base (3) thereof, in particular capable of being used for office chairs, work chairs, stools or standing auxiliary devices, the star-shaped base comprising a center seat (4) and a plurality of extending arms (5) mounted on the center seat (4), wherein the extending arms (5) are used for the star-shaped base (3) to be placed on the ground, and at least one of the extending arms (5) is hinged to the center seat (4) and can rotate relative to the center seat (4). A chair seat of the chair device can rotate or swing, while parts mounted at an upper end of a chair column do not need to be modified, and particularly, a supporting structure, a chair support for the chair seat to be placed, and the chair seat itself do not need to be modified.

A methane conversion device is provided that includes a reaction chamber comprising a converter that is configured to oxidize methane. A sensor is provided that is adapted to detect the presence of methane within gas exterior to the methane conversion device. A positioner is provided for positioning the device on an animal.

A control mechanism for a chair comprises a baseplate configured to be coupled to a chair base assembly, a support plate configured to be coupled to a chair seat, and an elastic element arranged between the base plate and the support plate. The elastic element enables the support plate to be tilted with respect to the base plate around a first tilt axis and a second tilt axis different from the first tilt axis. The control mechanism further comprises a control handle configured to be actuated in an actuating direction, and at least one stop element. Each stop element is arranged between the base plate and the support plate and configured to limit a minimum distance between the base plate and the support plate at the position of the corresponding stop element. A stop element adjust mechanism is coupled to the control handle and configured to adjust the minimum distance of each stop element in response to actuating the control handle in the actuating direction.

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 yoga or exercise stool may have a seat portion and a base portion; the base portion having window slot(s) formed in a front side, a rear side, or both; a handle slot formed at least in one side, such as the front side, at or near the top; horizontal gripping slot(s) formed in the left side, the right side, or both, at or near the top; and vertical gripping slot(s) formed in the left side, the right side, or both, at or near the bottom; advantageously four such slots being formed near the bottom corners of the left and right sides. A yoga stool also may have a base portion, and a seat portion on top of the base portion, wherein the seat portion has an internal firm support member such as a solid slat, and preferably softer material such as foam rubber surrounding the support member, at least on the left and right sides. The yoga stool may include opposed side elements joined by a rear element and front element with a removable top element that may be U-Shaped to allow for additional poses or exercises.

An active sitting chair is provided that encourages a sitter/user to sit actively by requiring balance adjustments and core engagement. The active sitting chair can be efficiently produced while being relatively sturdy and lightweight. The main body may be a monocoque shell that includes a rounded lower portion that contacts the surface the chair is on and promotes wobble of the chair when a sitter is seated on the chair. The chair may also include built-in handles for ease of lifting and a seat portion at the top of the chair that may include a cushion or similar component for increasing the stability and/or comfort of a sitter.

A chair base is revealed. A round bulge is formed on a center of a bottom surface of a bottom plate and a limit portion is gradually flattened from the round bulge toward a periphery of the bottom plate. A base body is disposed on a top surface of the bottom plate while a cover is used for covering the base body therein and enclosing the periphery of the bottom plate. Thereby the bottom plate, the base body, and the cover are connected and fixed by one another. While in use, users rock the chair by the round bulge on the bottom plate in response to their shifts in center of gravity. A rock angle of the chair is limited by the limit portion. Thereby the users will not tip the chair over while rocking the chair violently and safety in use is ensured.