A fluid actuator arrangement

A method for controlling the motion of a first piston rod and a second piston rod by means of a first piston body slidable arranged in a first cylinder housing of a fluid actuator arrangement, the first piston body divides the first cylinder housing interior into a first cylinder chamber and a second cylinder chamber, the first piston body exhibits a first through-bore and a second through-bore each encompassing the first piston rod and the second piston rod respectively, the first piston body comprises a first and second engagement and disengagement device arranged for engagement with the respective first and second piston rod;

• the method comprises the steps of:
• pressurizing the first and second cylinder chamber providing alternately a first and second stroke for achieving a reciprocating motion of the first piston body;
• engaging the first piston body to the first piston rod in the first stroke;
• and
• engaging the first piston body to the second piston rod in the second stroke.

A fluid actuator arrangement comprising;

• a first cylinder housing including a first head member and a second head member;
• a first piston body is slidable arranged in said first cylinder housing;
• the first piston body divides the first cylinder housing interior into a first cylinder chamber and a second cylinder chamber, at least the first cylinder chamber being coupled to a fluid supply;
• characterized by that;
• the first piston body exhibits a first through-bore and a second through-bore that extend through the first piston body in an axial direction;
• a first piston rod is arranged slidable in the first through-bore and a second piston rod is arranged slidable in the second through-bore;
• and
• the first through-bore comprises a first engagement and disengagement device and the second through-bore comprises a second engagement and disengagement device, which are arranged for providing individual engagement or disengagement to or from the respective first and second piston rod and characterized by that a sensor member is associated with the first piston rod for measuring the position of the first piston rod in such way that the sensor member measures the position of the first piston body relative the first cylinder housing.

A data medium storing program adapted for controlling the motion of a first piston rod

• and a second piston rod by means of a first piston body slidable arranged in a first cylinder housing of a fluid actuator arrangement, the first piston body divides the first cylinder housing interior into a first cylinder chamber and a second cylinder chamber, the first piston body exhibits a first through-bore and a second through-bore each encompassing the first piston rod and the second piston rod respectively, the first piston body comprises a first and second engagement and disengagement device arranged for engagement with the respective first and second piston rod, wherein said data medium storing program comprises a program code stored on a medium, which is readable on a computer, for causing a control unit to perform the method steps of:
• pressurizing the first and second cylinder chamber providing alternately a first and second stroke for achieving a reciprocating motion of the first piston body;
• engaging the first piston body to the first piston rod in the first stroke;
• and
• engaging the first piston body to the second piston rod in the second stroke.