Patent ID: 8869353

Claim:
A synchronous folding device, comprising two opposing folding members and a multi-joint rotary axle structure mounted between the two folding members, the multi-joint rotary axle structure having two ends which are able to be folded or unfolded synchronously; wherein the multi-joint rotary axle structure comprises at least one driving joint assembly and at least one driven joint assembly which are connected through a pivot means; the driving joint assembly comprising two opposing joint plates and a middle link plate assembly, the two opposing joint plates comprising a first joint plate and a second joint plate, the two opposing joint plates having synchronous actuating portion at respective inner ends thereof, the middle link plate assembly having connecting actuating portions at two ends thereof to mate with the synchronous actuating portions; the driven joint assembly being pivotally connected between the inner ends of the two opposing joint plates, the driven joint assembly comprising at least two first and second driven plates which are driven synchronously and inward, the inner ends of the two opposing joint plates being pivotally connected with outer ends of the first and second driven plates, the two ends of the middle link plate assembly being pivotally connected with inner ends of the first and second driven plates.