Patent ID: 8562448

Claim:
A joint structure, comprising: a sleeve defining a receiving shaft hole and a first cross slot communicating with the receiving shaft hole; a connecting shaft partially assembled and received within the receiving shaft hole of the sleeve, the connecting shaft defining a second cross slot corresponding to the first cross slot; a plurality of elastic pieces elastically received within a space formed between the sleeve and the connecting shaft; and a cross-limiting stopper mounted to and partially received within the second cross slot of the connecting shaft, and partially received in the first cross slot of the sleeve, wherein the cross-limiting stopper comprises a first arm and a second arm crossed by the first arm; the first cross slot and the second cross slot are both cruciform, each of the first cross slot and the second cross slot comprises two bar-shaped slots crossed by each other, the cross-limiting stopper is slidable relative to the connecting shaft and the sleeve along two different axes formed by the first cross slot and the second cross slot, such that the connecting shaft is radially adjustably installed within the sleeve and the connecting shaft is prevented rotating relative to the sleeve.