Patents Assigned to Aldridge Piling Equipment (Hire) Company Limited
  • Actuator apparatus
    Patent number: 6786477
    Abstract: An actuator (10) for use in installing or extracting piles and the like has a common member (12) supported at (14) and having jaws (16) for gripping a pile. Within the block (12) a double-acting piston (18) is located alongside a space (20) for a control valve arrangement which provides hydraulic fluid, in various ways described, to create vibratory or impact forces from the piston (18). The piston and the valve arrangements are both removable and replaceable by alternatives, to modify the mode of operation of the actuator (10).
    Type: Grant
    Filed: July 23, 2001
    Date of Patent: September 7, 2004
    Assignee: Aldridge Piling Equipment (Hire) Company Limited
    Inventor: David Coley