Patent ID: 6942073

Claim:
An activation device for a damper having a piston assembly and a piston rod assembly provided with a piston rod which has an axial passage defined in the piston rod and a fluid hole defined in a side face of the piston rod to communicate the axial passage with a space outside the piston rod, the activation device comprising: a stopping tube adapted to be securely received in the piston rod and having grooves defined in a peripheral edge of the stopping tube and first teeth formed on the peripheral edge of the stopping tube; a driving tube adapted to be movably received in the piston rod and in the stopping tube and having second teeth formed on a peripheral edge of the driving tube; and a rotating tube adapted to be movably received in the piston rod and having third teeth engaged with the second teeth so that the movement of the driving tube is able to drive the rotating tube so that it rotates at an angle to selectively allow a corresponding one of the third teeth to be received in the grooves of the stopping tube such that communication between the axial passage and the space is selectively plugged.