Patent ID: 7530637
Filing Date: 2009-05-12
Classification: A47C

Abstract:
1. A chair assembly comprising a chassis mounted over a pneumatic foot rod, a backrest frame and a seat frame pivotally combined with each other, wherein the pneumatic foot rod is a pneumatic rod immovably mounted on a foot pedestal and has a top surface and a controlling button formed on the top surface; the backrest frame has a front end and two supporting rods formed on the front end and correspondingly pivotally mounted to two sides of the chassis, with each supporting rod having a pivotal hole and an engaging hole, and with the backrest frame having a rear end with a recess to connect with a backrest; the seat frame for resting a chair pad has a front end with a connecting rod engaged to a front end of the chassis and has a rear end pivotally attached to the backrest frame; and the chassis comprises a tube engaged to the pneumatic foot rod and comprises a dish-like base, with the controlling button driven by a wire-controlled triggering element of the chassis, with a middle section of chassis having two pivotal holes respectively defined on the two sides of the chassis, with the pivotal holes of the backrest frame and of the chassis being aligned for pivotal connection, with an elongated rod defined on the chassis below each of the two pivotal holes to receive a sliding pivotal rod that is abutted by a spring of a pressing board, with the pressing board driven by threads on a shaft of an adjusting wheel that is driven by an engagement gear with a transmitting crank, and with two engaging holes defined on the two sides at the front end of the chassis.