Device to guarantee the sequence of movement of at least two fluid-actuated displacement units
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United States of America Patent
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Mar 2, 2010
Grant Date -
May 10, 2007
app pub date -
Nov 1, 2006
filing date -
Nov 2, 2005
priority date (Note) -
Expired
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Abstract
A device to guarantee the sequence of movement of at least two fluid-actuated displacement units. A primary displacement unit includes a cylinder (Z) with a retractable and extendable piston rod (4). Integrated into the cylinder (Z) is a directional control valve that can be controlled by the piston rod (4). The directional control valve has a closed position and an open position. The directional control valve is switched into the closed position when the piston rod (4) is not fully extended or not approximately fully extended, and into the open position when the piston rod is fully or approximately fully extended, and a compression chamber (1a) of the cylinder (Z) is thereby placed in communication with a compression chamber of the secondary displacement unit (secondary cylinder 2b).
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