Patent ID: 7458638
Filing Date: 2008-12-02
Classification: A47C

Abstract:
1. A lift chair system comprising: a chair including an essentially horizontal seat having a lower surface; a horizontal upper brace supporting the chair and a lower brace with an adjustable positioning assembly between the upper and lower braces for varying the height between the chair and a recipient surface, the positioning assembly including a lower tube with an upper end and a lower end attached to the lower brace centrally, the positioning assembly also including an upper tube with a lower end and an upper end attached to the upper brace rearwardly, the upper end of the lower tube being slidably received in the lower end of the upper tube, the positioning assembly also including aligned axial slots in the lower tube and aligned radial fingers interior of the upper tube extending through the slots, the radial fingers being located adjacent to the axial center of the upper tube whereby when the chair and upper tube are in the upper orientation the lower portion of the upper tube will hide the slots and when the chair and upper tube are in the lower orientation the upper portion of the tube will hide the slots; and a drive assembly for raising and lowering the upper tube, upper brace and chair with respect to the lower tube, lower brace and recipient surface, the drive assembly including a rotatable drive screw interior of the tubes with a bolt interior of the tube, the bolt being threadedly received in the drive screw whereby rotation of the drive screw will raise and lower the bolt and chair, the drive assembly also including a motor with a line for coupling to a source of electrical potential and a driver coupling the motor and the drive screw and a controller for activating the motor and drive screw to raise and lower the chair.