Abstract: A childbirth aid includes a base panel, two ankle-supporting blocks bilaterally located at a top wall of the base panel for supporting the ankles of a pregnant woman to keep the body center of gravity of the pregnant woman in line with the fulcrum of the mechanism of each foot of the pregnant woman, each ankle-supporting block having a planar top surface and an inclined surface downwardly extended from the planar top surface to the top wall of the base panel, and a gap defined between the two ankle-supporting blocks for the mounting of a safety mirror or anti-collision elastic net selectively in a detachable manner.

Abstract: A childbirth aid includes a base panel, two ankle-supporting blocks bilaterally located at a top wall of the base panel for supporting the ankles of a pregnant woman to keep the body center of gravity of the pregnant woman in line with the fulcrum of the mechanism of each foot of the pregnant woman, each ankle-supporting block having a planar top surface and an inclined surface downwardly extended from the planar top surface to the top wall of the base panel, and a gap defined between the two ankle-supporting blocks for the mounting of a safety mirror or anti-collision elastic net selectively in a detachable manner.

Abstract: A chair includes a backrest, and a head and neck support structure arranged at the top side of the backrest for supporting the head and neck of a person resting on the backrest. The head and neck support includes a neck support portion shaped like a convex bar and transversely arranged at the top side of the backrest, and a plurality of radial V-grooves radially upwardly extended from the top side of the neck support portion and inclining upwardly backwardly from the neck support portion in a smooth manner.

Abstract: An automatically adjustable chair structure essentially includes a chair body, a base, an extension bar, at least one first cushion mechanism, and at least one second cushion mechanism. When a user sits on the chair body, the user's body weight is cushioned by the first and second cushion mechanisms. In addition, the two sled runner-shaped supports lying on the floor and the pivotable design of the extension bar allow the extension bar to move backward. Thus, the tilt angle of the chair body can be automatically changed to suit the user's sitting posture.

Abstract: An automatically adjustable chair structure essentially includes a chair body, a base, an extension bar, at least one first cushion mechanism, and at least one second cushion mechanism. When a user sits on the chair body, the user's body weight is cushioned by the first and second cushion mechanisms. In addition, the two sled runner-shaped supports lying on the floor and the pivotable design of the extension bar allow the extension bar to move backward. Thus, the tilt angle of the chair body can be automatically changed to suit the user's sitting posture.

Abstract: An improved ergonomic chair, including a chair base, a chair cushion and a chair back located to the rear of the chair base. Support strength of cushion pads on the chair back assumes a fan-shape extending from a lower end towards the upper end, thereby dispersing the compressive stress on the lower back and supporting the back of a person. A support cushion is located on the chair back corresponding to the cervical vertebra of a person, and a head cushion, provided with a plurality of depressions, is located on the chair back above the support cushion. Accordingly, the design of the support cushion and the head cushion facilitating the dispersal of the compressive stress on the lower back and support of the back and cervical vertebra provide the chair back with the ability to appropriately support the cervical vertebra, thereby enabling neck pains to be avoided when sitting.