An Innovation Proposal Employing Lead Screw Mechanism for Office Chair Height Adjustment

Currently, existing office chairs contain reclining and height adjustment capabilities but often require intensive manual adjustment or lack full customization. The motivation behind this concept was to create an office chair that maintains its utility while integrating more advanced mechanical designs to increase adjustability. The motorized seat height adjustment that implements a lead screw mechanism eliminates the need to manually crank a lever or apply pressure to the chair seat, which is common in chairs using a pneumatic cylinder. In this paper, a feasible innovation employing a lead screw mechanism for an office chair height change system is proposed. Firstly, the general background of current office chair height adjustment designs and drawbacks are discussed. Secondly, an overview of the modeling of the overall chair assembly and functions of the height change system’s parts is presented. Finally, analytical calculations are analyzed, and finite element analysis is conducted using SolidWorks to assess the nominal shear, nominal stresses, and static displacement of the lead screw. The result of this paper proves the feasibility of the implementation of the lead screw mechanism in office chairs.