Patent ID: 6474215
Filing Date: 2002-11-05
Classification: C04B,F15B

Abstract:
Actuator effecting an approach pre-stroke and a working stroke for maneuvering a tool, comprising an actuator body in which at least two pistons are mounted so as to be able to slide in the actuator body, either in the same direction or in opposite directions, when extracted from the actuator body, namely a pre-stroke piston and at least one working piston actuating the tool, said actuator further comprising locking means disposed between said actuator body and a pre-stroke rod joined to said pre-stroke piston, these locking means operating at least in the retraction direction thereof, characterised in that said working rod and said pre-stroke rod are displaced in the same direction between their retracted position inside said actuator body and their extracted position, the working rod being slidably mounted in an axial compartment of the pre-stroke rod.