US Patent 9545133 Safety belt buckle for race car

A safety belt buckle includes a base unit, a cover covering and combined with the base unit, a locking device mounted in the cover, a torsion spring mounted on the cover, and a driving unit mounted on the cover. When in use, a latch plate of a safety belt is inserted into one of the insertion slots of the base unit. Thus, the user has to apply a determined force to overcome the elastic force of the torsion spring and to drive the driving unit so as to release the latch plate of the safety belt, thereby preventing the driving unit from being driven freely by an external force due to an unintentional touch or hit, and thereby preventing the latch plate of the safety belt from being unlatched easily.