| 主权项 |
1. A cylinder assembly, comprising:
a cylinder end having a cylinder end opening; a cylinder barrel attached to the cylinder end; a piston residing within the cylinder barrel, wherein an opening through the piston forms a sleeve passing through a center portion of the piston, the sleeve having a non-circular cross-section; a rod attached at one end to the piston and at a second end to a rod end, the rod extending out of the cylinder barrel, the rod being configured to extend or retract, the rod further being configured to rotate with respect to the cylinder barrel and the cylinder end, wherein an opening in the rod further forms the sleeve passing through a central interior portion of the rod; and a rotation position shaft, a protruding end of the rotation position shaft passing through the cylinder end opening, a portion of the rotation position shaft further passing through the sleeve formed by the opening through the piston and the opening in the rod, the portion of the rotation position shaft passing through the sleeve having a cross-sectional shape corresponding to the non-circular cross-section of the sleeve, the protruding end of the rotation position shaft being free to rotate within the cylinder end opening in response to a rotation of the rod, the portion of the rotation position shaft being free to slide within the sleeve in response to an extension or retraction of the rod. |
