An adjustable head and neck support has a common adjustment mechanism by which a coupled movement of a head support area and a neck support area is enabled. The adjustment mechanism is configured in such a way that, on the one hand, a linear, joint height adjustment of the head support area and the neck support area in a Z direction is enabled and, on the other hand, alternatively, only a swivel adjustment of at least the neck support area is enabled, so that the neck support area can be swiveled forward in the direction of a user. The adjustment mechanism is embodied in particular as an asymmetrically configured toggle lever mechanism. This allows for easy adjustment of the head and neck support.

In an embodiment a headrest position adjustment system includes a housing mounted on a front surface portion of a high-back board, a headrest mounted on the housing, the headrest being capable of moving forward and backward, a fixing frame comprising slide holes in opposite side portions of the fixing frame, the fixing frame being mounted inside the housing, a first motor mounted on the fixing frame, the first motor having a first lead screw facing forward as an output shaft, and a side bracket disposed on each of the opposite side portions of the fixing frame and connected to the headrest, the side bracket being fastened to a slide hole such that the side bracket is capable of being moved forward and backward.

In an embodiment a headrest position adjustment system includes a housing mounted on a front surface portion of a high-back board, a headrest mounted on the housing, the headrest being capable of moving forward and backward, a fixing frame comprising slide holes in opposite side portions of the fixing frame, the fixing frame being mounted inside the housing, a first motor mounted on the fixing frame, the first motor having a first lead screw facing forward as an output shaft, and a side bracket disposed on each of the opposite side portions of the fixing frame and connected to the headrest, the side bracket being fastened to a slide hole such that the side bracket is capable of being moved forward and backward.

A chair-back adjusting structure includes a first plate, a second plate, and a moving component. The first plate has a fixing plate perpendicularly installed thereon. The second plate has two fixing brackets installed thereon. Each fixing bracket defines a through hole. The moving component includes adjusting sleeves, adjusting shafts, and stop collars. The adjusting sleeves are symmetrically arranged on the second plate. Each adjusting sleeve defines therein a channel and is tapered in shape. Each stop collar is mounted around the corresponding adjusting shaft. Each adjusting shaft has one end fixed to the fixing plate and an opposite end entering and fixed in the corresponding channel through the stop collar. In use, the first plate is installed in an upper back part of a chair, and the second plate is installed in a lower back part of the chair, so that the height of the chair back can be adjusted.

A chair-back adjusting structure includes a first plate, a second plate, and a moving component. The first plate has a fixing plate perpendicularly installed thereon. The second plate has two fixing brackets installed thereon. Each fixing bracket defines a through hole. The moving component includes adjusting sleeves, adjusting shafts, and stop collars. The adjusting sleeves are symmetrically arranged on the second plate. Each adjusting sleeve defines therein a channel and is tapered in shape. Each stop collar is mounted around the corresponding adjusting shaft. Each adjusting shaft has one end fixed to the fixing plate and an opposite end entering and fixed in the corresponding channel through the stop collar. In use, the first plate is installed in an upper back part of a chair, and the second plate is installed in a lower back part of the chair, so that the height of the chair back can be adjusted.

A chair-back adjusting structure includes a first plate, a second plate, and a moving component. The first plate has a fixing plate perpendicularly installed thereon. The second plate has two fixing brackets installed thereon. Each fixing bracket defines a through hole. The moving component includes adjusting sleeves, adjusting shafts, and stop collars. The adjusting sleeves are symmetrically arranged on the second plate. Each adjusting sleeve defines therein a channel and is tapered in shape. Each stop collar is mounted around the corresponding adjusting shaft. Each adjusting shaft has one end fixed to the fixing plate and an opposite end entering and fixed in the corresponding channel through the stop collar. In use, the first plate is installed in an upper back part of a chair, and the second plate is installed in a lower back part of the chair, so that the height of the chair back can be adjusted.