A jack screw system having an upper, middle, and lower jack screw, each having corresponding jack screw teeth, for raising and lowering surfaces. The telescopic expansion of the jack screw system can be achieved using an engaging gear or belt. The jack screw system is generally used with furniture but may be used to raise any appropriate surface.

A jack screw system having an upper, middle, and lower jack screw, each having corresponding jack screw teeth, for raising and lowering surfaces. The telescopic expansion of the jack screw system can be achieved using an engaging gear or belt. The jack screw system is generally used with furniture but may be used to raise any appropriate surface.

A desk has a base that rests on an underlying floor surface, a work surface that is supported by the base, and a seat that is rotatably connected to the base for rotation between a first position, located in a conventional position behind the desk so a person may sit at the desk, and a second position, located to one side of the desk so that a person may instead stand at the desk. The seat is adjustable radially relative to its axis of rotation, vertically up and down relative to the floor surface, and angularly toward its axis of rotation.

A desk has a base that rests on an underlying floor surface, a work surface that is supported by the base, and a seat that is rotatably connected to the base for rotation between a first position, located in a conventional position behind the desk so a person may sit at the desk, and a second position, located to one side of the desk so that a person may instead stand at the desk. The seat is adjustable radially relative to its axis of rotation, vertically up and down relative to the floor surface, and angularly toward its axis of rotation.

A person lifting assembly to assist a person who has fallen get to a standing position includes a plurality of legs that define a first set of legs and a second set of legs. Each of the legs has a telescopically adjustable height. A base is attached to each set of legs such that the base has an adjustable height. A pair of armrests that have an adjustable height is included. Each of the armrests is attached to and extends between one of the sets of legs. A plurality of lifting units where each of the legs has a lifting unit mounted therein that extends into an associated one of the pair of armrests. Each of the lifting units extends or retracts an associated one of the legs with respect to the base to lift or lower the base with respect to the floor surface.

A person lifting assembly to assist a person who has fallen get to a standing position includes a plurality of legs that define a first set of legs and a second set of legs. Each of the legs has a telescopically adjustable height. A base is attached to each set of legs such that the base has an adjustable height. A pair of armrests that have an adjustable height is included. Each of the armrests is attached to and extends between one of the sets of legs. A plurality of lifting units where each of the legs has a lifting unit mounted therein that extends into an associated one of the pair of armrests. Each of the lifting units extends or retracts an associated one of the legs with respect to the base to lift or lower the base with respect to the floor surface.

A rotatable chair comprising a backrest unit, a seat plate unit, a supporting unit and a rotating unit; the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle; the backrest unit and the seat plate unit are fixed to the upper plate; the upper plate is provided with an upper locating hole; the supporting unit is fixed to the lower plate; the lower plate is provided with a plurality of lower locating holes; the rotating disc is disposed between the upper plate and the lower plate; the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate at the same time; the first elastic ball comprises an elastic piece and a locating ball.

A rotatable chair comprising a backrest unit, a seat plate unit, a supporting unit and a rotating unit; the rotating unit comprises an upper plate, a lower plate, a rotating disc, a connecting shaft, a first elastic ball and a handle; the backrest unit and the seat plate unit are fixed to the upper plate; the upper plate is provided with an upper locating hole; the supporting unit is fixed to the lower plate; the lower plate is provided with a plurality of lower locating holes; the rotating disc is disposed between the upper plate and the lower plate; the connecting shaft penetrates through the central position of the upper plate, the rotating disc and the lower plate at the same time; the first elastic ball comprises an elastic piece and a locating ball.

A ball chair may comprise a chair frame, a ball body and an adjusting unit. The chair frame has a connecting base and a legs base, and a supporting column formed therebetween is configured to achieve a telescopic action thereby adjusting a height of the ball chair. The connecting base is formed in a concave shape to form a housing space therein, and an annular frame is formed at an upper end of the connecting base. The ball body is configured to be coupled on the connecting base of the chair frame, and the annular frame is configured to couple with an outer periphery of the ball body thereby limiting a position thereof. As a result, the ball chair is suitable for different statures of users and enables the users to sit thereon for training or rehabilitation.

A ball chair may comprise a chair frame, a ball body and an adjusting unit. The chair frame has a connecting base and a legs base, and a supporting column formed therebetween is configured to achieve a telescopic action thereby adjusting a height of the ball chair. The connecting base is formed in a concave shape to form a housing space therein, and an annular frame is formed at an upper end of the connecting base. The ball body is configured to be coupled on the connecting base of the chair frame, and the annular frame is configured to couple with an outer periphery of the ball body thereby limiting a position thereof. As a result, the ball chair is suitable for different statures of users and enables the users to sit thereon for training or rehabilitation.