Abstract: A hand-operated worm gear height adjustable table includes a table top, a base mechanism, a lift mechanism, and a driving mechanism. The base mechanism includes a base and tracks on the base. The lift mechanism includes two parallel first lift arms and two parallel second lift arms which cross with each other to form X-shaped structures. The driving mechanism is connected to the upper ends of the first lift arms and includes two U-shaped slide rails and a driving shaft penetrating through the upper ends of the first lift arms. The center of the driving shaft is provided with a worm gear and a worm. The outer end surface of the worm is sleeved with a first sleeve component and a second sleeve component with a cavity provided therebetween, and the outer end surface of the first sleeve component is sleeved with the first torsional spring.

Abstract: A hand-operated worm gear height adjustable table includes a table top, a base mechanism, a lift mechanism, and a driving mechanism. The base mechanism includes a base and tracks on the base. The lift mechanism includes two parallel first lift arms and two parallel second lift arms which cross with each other to form X-shaped structures. The driving mechanism is connected to the upper ends of the first lift arms and includes two U-shaped slide rails and a driving shaft penetrating through the upper ends of the first lift arms. The center of the driving shaft is provided with a worm gear and a worm. The outer end surface of the worm is sleeved with a first sleeve component and a second sleeve component with a cavity provided therebetween, and the outer end surface of the first sleeve component is sleeved with the first torsional spring.