According to an aspect of some embodiments of the present disclosure there is provided a chair including a base component, a seat component connected to the base component by a central hinge, and a back-rest component connected to the seat component by a back hinge, wherein when the chair is in a sitting position, the seat component is lower than the central hinge. Related apparatus and methods are also described.

A dental chair is adapted to be used in cooperation with a dental scanning instrument. The dental chair includes a chair unit, an adjustable support arm, and a display unit. The adjustable support arm has a first end that is connected to the chair unit, and a second end that is opposite to the first end. The adjustable support arm is adjustable in a segment-by-segment manner to move the second end relative to the first end. The display unit is connected to the second end of the adjustable support arm and is adapted to be in signal communication with the dental scanning instrument for displaying an image generated by the dental scanning instrument.

A dental chair is adapted to be used in cooperation with a dental scanning instrument. The dental chair includes a chair unit, an adjustable support arm, and a display unit. The adjustable support arm has a first end that is connected to the chair unit, and a second end that is opposite to the first end. The adjustable support arm is adjustable in a segment-by-segment manner to move the second end relative to the first end. The display unit is connected to the second end of the adjustable support arm and is adapted to be in signal communication with the dental scanning instrument for displaying an image generated by the dental scanning instrument.

The present disclosure relates to a unit chair. The unit chair includes a link unit for adjusting a posture of a headrest, wherein the link unit includes: a first link member fixed to a backrest portion of the unit chair; a second link member having one end portion hinged to the first link member by a first hinge pin; and a first ratchet member formed on one surface of at least one of the first link member and the second link member and constraining motion of the second link member so that the second link member is rotatable only in one direction based on a central axis line of the first hinge pin, wherein the first ratchet member includes a first ratchet base portion including a plurality of saw teeth formed on one surface, arranged in a ring shape based on the central axis line of the first hinge pin, uplifted in a direction toward the central axis line, and inclined only in one direction, and having an opposite surface fixed to the first link member; and a first ratchet rotating portion including a plurality of saw teeth formed on one surface and at least partially engaged with at least some of the saw teeth of the first ratchet base portion and having an opposite surface fixed to the second link member.

The present disclosure relates to a unit chair. The unit chair includes a link unit for adjusting a posture of a headrest, wherein the link unit includes: a first link member fixed to a backrest portion of the unit chair; a second link member having one end portion hinged to the first link member by a first hinge pin; and a first ratchet member formed on one surface of at least one of the first link member and the second link member and constraining motion of the second link member so that the second link member is rotatable only in one direction based on a central axis line of the first hinge pin, wherein the first ratchet member includes a first ratchet base portion including a plurality of saw teeth formed on one surface, arranged in a ring shape based on the central axis line of the first hinge pin, uplifted in a direction toward the central axis line, and inclined only in one direction, and having an opposite surface fixed to the first link member; and a first ratchet rotating portion including a plurality of saw teeth formed on one surface and at least partially engaged with at least some of the saw teeth of the first ratchet base portion and having an opposite surface fixed to the second link member.

The present invention relates to the field of treatment units, that is equipment for health care centers that combine, in one unit, a chair and analysis and/or treatment instruments, in addition to various accessories, for example lighting means. The object of the invention in particular is a chair for a treatment unit specifically intended for ophthalmic use, although it does not exclude use in treatment units of other type.

The present invention relates to the field of treatment units, that is equipment for health care centers that combine, in one unit, a chair and analysis and/or treatment instruments, in addition to various accessories, for example lighting means. The object of the invention in particular is a chair for a treatment unit specifically intended for ophthalmic use, although it does not exclude use in treatment units of other type.

Provided are a medical diagnosis apparatus and a medical diagnosis method using the same. According to an embodiment, the medical diagnosis apparatus may include: a main body; a chair unit movably supported by the main body and on which an object is positioned; a diagnosis part that is movably connected to the main body and is spaced apart from the chair unit by a preset first distance in one plane; a controller configured to generate a control signal for moving the diagnosis part according to preset information; and a first driving device configured to generate a driving force for moving the diagnosis part according to the control signal.

Provided are a medical diagnosis apparatus and a medical diagnosis method using the same. According to an embodiment, the medical diagnosis apparatus may include: a main body; a chair unit movably supported by the main body and on which an object is positioned; a diagnosis part that is movably connected to the main body and is spaced apart from the chair unit by a preset first distance in one plane; a controller configured to generate a control signal for moving the diagnosis part according to preset information; and a first driving device configured to generate a driving force for moving the diagnosis part according to the control signal.

A foldable massage chair, including a face pillow assembly for supporting the head, a chest pillow assembly for supporting the chest, a handrail assembly for supporting wrists, a front support piece, a seat cushion assembly, a back support rod, a kneeboard assembly, a back supporting frame, and a front supporting frame. When a user needs to use this chair, it is placed in an expanded or use position, so the user may sit on the seat cushion and lean on the massage chair, completely exposing his back, waist, and hips for a masseur to massage. When the chair needs to be put away, it is possible to fold down the chair into a collapsed position by folding the seat cushion assembly, front support piece, chest pillow assembly, and handrail assembly. Also, the front supporting frame is folded towards the back supporting frame. Consequently, the size of the entire chair decreases.