Actuator

Abstract

This invention relates to an actuator which consists of a hydraulic or pneumatic drive, which in accordance with the invention is combined with an electromechanical drive in one constructional unit, the hydraulic or pneumatic drive being the normal drive of the actuator and the electromechanical drive being used for an alternative actuation of the actuator.

1 . An actuator, comprising a hydraulic or pneumatic drive, characterized in that 
 it is combined with an electromechanical drive in one constructional unit, the hydraulic or pneumatic drive being the normal drive of the actuator and the electromechanical drive being used for an alternative actuation of the actuator.    
   
   
       2 . The actuator as claimed in  claim 1 , characterized in that the electromechanical drive is arranged in series with the hydraulic or pneumatic drive.  
   
   
       3 . The actuator as claimed in  claim 1 , characterized in that the electromechanical drive is arranged parallel to the hydraulic or pneumatic drive.  
   
   
       4 . The actuator as claimed in  claim 1 , characterized in that the electromechanical drive is loosely connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement.  
   
   
       5 . The actuator as claimed in  claim 1 , characterized in that the electromechanical drive is firmly connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load in normal operation and being actuatable as active drive only for the alternative movement.  
   
   
       6 . The actuator as claimed in  claim 2 , characterized in that the electromechanical drive is loosely connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement.  
   
   
       7 . The actuator as claimed in  claim 3 , characterized in that the electromechanical drive is loosely connected with the hydraulic or pneumatic drive, performing no movement in normal operation and being actuatable only for the alternative movement.  
   
   
       8 . The actuator as claimed in  claim 2 , characterized in that the electromechanical drive is firmly connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load in normal operation and being actuatable as active drive only for the alternative movement.  
   
   
       9 . The actuator as claimed in  claim 3 , characterized in that the electromechanical drive is firmly connected with the hydraulic or pneumatic drive, performing the movement of the hydraulic or pneumatic drive without load in normal operation and being actuatable as active drive only for the alternative movement.