Rotary cylinder assembly for a machine tool

A rotary cylinder assembly for a machine tool, comprising:

• a fluid shaft housing having extend and retract ports;
• a cylinder body housing a movable piston removably attached to a rod connector that extends or retracts a work piece mounted to the machine tool in response to fluid pressure supplied from said extend port or said retract port, respectively;
• a shaft end cover coupled between said fluid shaft housing and said cylinder body, said shaft end cover including a first central axis and a second central axis orthogonally oriented to the first central axis and each of said first and second central axes extending through a center of said shaft end cover, said shaft end cover including:
• a first face in sealing contact with said fluid shaft housing;
• a second face in sealing contact with said cylinder body and configured such that said piston cannot extend therethrough;
• a lock check system housed including first and second lock check cartridges housed in said shaft end cover extending parallel to and on opposite sides of the first central axis, said lock check system further including a number of flow paths therethrough in communication with said extend and retract ports and said first and second lock check cartridges to provide fluid flow therethrough to said cylinder body, wherein:
• said first lock check cartridge is substantially located on a first side of the second central axis and said second lock check cartridge is substantially located on a second side of the second central axis;
• and
• said first lock check cartridge extends to a pilot port located on the second side of the second central axis-and said second lock check cartridge extends to a pilot port located on the first side of the second central axis.

A shaft end cover for housing for a lock check system, comprising:

• a body extending along a longitudinal axis and having a first face and an opposite second face, each of said first and second faces being orthogonally oriented to the longitudinal axis;
• and
• first and second lock check cartridges positioned in said body;
• and
• a number of flow paths in communication with said first and second lock check cartridges providing fluid flow through said first and second lock check cartridges,
• wherein one of said number of flow paths includes a first channel along said first face that extends between a pilot port of said first lock check cartridge and an inlet port of said second lock check cartridge and another of said flow paths includes a second channel formed along said first face extending between a pilot port of said second lock check cartridge and an inlet port of said first lock check cartridge.