An elastic seesaw-type tilting mechanism is provided, including: a base support, configured to be connected with a chair base through a chair column; a seat support, being pivotably mounted on the base support and configured to be connected with a seat; a backrest support, being pivotably mounted on the base support and configured to be connected with a backrest; a first elastic mechanism, being connected with the seat support and the backrest support to form an elastic seesaw mechanism; a second elastic mechanism, being connected with the base support and the seat support, the second elastic mechanism and the first elastic mechanism being respectively biased against the seat support in opposite directions. A swivel chair is further provided, including: one of the elastic seesaw-type tilting mechanism as described above, a seat, a backrest, a chair column and a chair base.

A tiltable stool includes a seat support, a seat, and a tilt mechanism. The seat is mounted to an upper end of the seat support. The tilt mechanism allows the seat to tilt in a desired direction. The tilt mechanism includes a coiled wave spring, an upper spring retainer and a lower spring retainer, a fastener bolt, and a tilt limiter. The upper spring retainer and the lower spring retainer are disposed opposite each other to sandwich the coiled wave spring therebetween. The fastener bolt pivotably holds the upper spring retainer in position. The tilt limiter is disposed inside the coiled wave spring and is secured to either one of the spring retainers. The tilt limiter includes a conical surface thereon which contacts a contact surface when the seat tilts to a predetermined tilt angle. The upper spring retainer is secured to a lower end of the seat support.

A tiltable stool includes a seat support, a seat, and a tilt mechanism. The seat is mounted to an upper end of the seat support. The tilt mechanism allows the seat to tilt in a desired direction. The tilt mechanism includes a coiled wave spring, an upper spring retainer and a lower spring retainer, a fastener bolt, and a tilt limiter. The upper spring retainer and the lower spring retainer are disposed opposite each other to sandwich the coiled wave spring therebetween. The fastener bolt pivotably holds the upper spring retainer in position. The tilt limiter is disposed inside the coiled wave spring and is secured to either one of the spring retainers. The tilt limiter includes a conical surface thereon which contacts a contact surface when the seat tilts to a predetermined tilt angle. The upper spring retainer is secured to a lower end of the seat support.

Joystick chair is an input device for interaction between the user and computer. It enables the movement of the user in games. The invention is used by placing feet on the platform (3) and sitting or leaning on the seat (23). Command for turning is achieved by rotating the seat (23), either to the left or to the right. Command for forward movement is issued by pulling the left or right controller (36, 41) with fingers, while the command for backward movement is issued by pushing the left or right controller (36, 41) away by palms. Control handles for lateral movement (49, 56) are separated from the forward-back controls that are located on the controllers (36, 41). Other commands are achieved with buttons on the left and right controller and they are accessible with thumbs. The software allows the modifications of all available actions of the invention.

Joystick chair is an input device for interaction between the user and computer. It enables the movement of the user in games. The invention is used by placing feet on the platform (3) and sitting or leaning on the seat (23). Command for turning is achieved by rotating the seat (23), either to the left or to the right. Command for forward movement is issued by pulling the left or right controller (36, 41) with fingers, while the command for backward movement is issued by pushing the left or right controller (36, 41) away by palms. Control handles for lateral movement (49, 56) are separated from the forward-back controls that are located on the controllers (36, 41). Other commands are achieved with buttons on the left and right controller and they are accessible with thumbs. The software allows the modifications of all available actions of the invention.

Left and right fixed arm plates extend upwardly from the seat of a chair. A left movable arm plate is above the left fixed arm plate and a right movable arm plate is above the right fixed arm plate. Parallel left links couple the left fixed plate and the left movable plate in parallelogram manner. Parallel right links couple the right fixed plate and the right movable plate in parallelogram manner. A left arm rest is coupled to the left movable plate and a right arm rest is coupled to the right movable plate. A gas lift cylinder including an upper cylinder secured to the seat reciprocable within a lower cylinder. The upper cylinder is urged upwardly. A bracket rotatably couples a lower foot support to a lower cylinder. A leaf spring couples the seat and the bracket.

Left and right fixed arm plates extend upwardly from the seat of a chair. A left movable arm plate is above the left fixed arm plate and a right movable arm plate is above the right fixed arm plate. Parallel left links couple the left fixed plate and the left movable plate in parallelogram manner. Parallel right links couple the right fixed plate and the right movable plate in parallelogram manner. A left arm rest is coupled to the left movable plate and a right arm rest is coupled to the right movable plate. A gas lift cylinder including an upper cylinder secured to the seat reciprocable within a lower cylinder. The upper cylinder is urged upwardly. A bracket rotatably couples a lower foot support to a lower cylinder. A leaf spring couples the seat and the bracket.

A system for supporting a user in a plurality of ergonomic positions that includes a first assembly and a second, separate assembly. The first assembly includes first and second components that are adjustable to support the user in first and second different postures. The second assembly includes separate first and second components that are adjustable to support the user in the first and second postures. Upon the relative position of the second assembly first and second components being changed from the first to the second position, a second assembly processor transmits a wireless signal to a receiver of the first assembly. Upon receiving the wireless signal, a first assembly processor controls an actuator to adjust the position of the first assembly first and second components from the first position to the second position.

A gas cylinder quick release device has an upper bearing plate, and a lower annular collar arranged below the upper bearing plate on an axis common to the upper bearing plate and the lower annular collar. A handle is mounted to move between a first position and a second position. Movement of the handle from the first position to the second position imparts axial displacement of the upper bearing plate and the lower annular collar away from each other along the axis. The lower annular collar moves downward along the axis when the lower annular collar is axially displaced away from the upper bearing plate.

A gas cylinder quick release device has an upper bearing plate, and a lower annular collar arranged below the upper bearing plate on an axis common to the upper bearing plate and the lower annular collar. A handle is mounted to move between a first position and a second position. Movement of the handle from the first position to the second position imparts axial displacement of the upper bearing plate and the lower annular collar away from each other along the axis. The lower annular collar moves downward along the axis when the lower annular collar is axially displaced away from the upper bearing plate.