Patent ID: 8381619

Claim:
A fastening device, used to fasten two locknuts to an object simultaneously, and comprising: a pedestal, defining a first sliding groove; a pair of fixing blocks, received and fixed in the first sliding groove, each of the fixing blocks defining a through hole; a pair of rotating elements, each comprising an operating portion disposed on one side of the pedestal and a fixing shaft protruding from the operating portion and received in a corresponding one of the through holes; a pair of first gear wheels, disposed on the other side of the pedestal, each of the first gear wheels comprising a gear body attached to a corresponding one of the fixing shafts and a sleeve protruding from the gear body and snugly receiving one of the locknuts; a second gear wheel, attached to the pedestal and synchronously engaging the pair of first gear wheels to achieve synchronous movements of the pair of first gear wheels; and a pair of calibrating tabs, one end of each of the calibrating tabs pivoted to a corresponding one of the fixing blocks, and the other end of each of the calibrating tabs movably positioned in a corresponding one of the gear bodies, wherein inner surfaces of the sleeves are polygon-shaped, and when the calibrating tabs are positioned in the gear bodies respectively, the sleeves are positioned in a same angle.