Patent ID: 7588232

Claim:
A synchronous actuator, comprising: a telescopic cylinder assembly including at least three pivotally connected cylinders; a drive assembly including a drive wheel, at least two pulleys and a pulling member, the drive assembly being disposed at two adjacent cylinders, the drive wheel being pivotally disposed at a lower cylinder, the pulleys of the driven assembly being pivotally disposed at the two adjacent cylinders, respectively, both ends of the pulling member of the drive assembly being connected to an upper cylinder, the pulling member of the drive assembly being rolled around the drive wheel and the pulleys of the drive assembly, respectively; and at least one driven assembly including at least two pulleys and a pulling member, the driven assembly being disposed at three adjacent cylinders, the pulleys of the driven assembly being pivotally disposed at the upper cylinder and a middle cylinder, respectively, both ends of the pulling member of the driven assembly being connected to the upper cylinder and the lower cylinder, the pulling member of the driven assembly being rolled around the pulleys of the driven assembly, respectively, with the drive assembly and the driven assembly, the cylinders of the telescopic cylinder assembly are extended or retracted synchronously in axial direction.