摘要 |
1. A three-position angular motion module for rotation and positioning, particularly of a manipulator arm, in the body of which there is a cylinder and a hydraulic or pneumatic piston with a toothed bar indented on it and meshed with a toothed gear which transmits rotation, characterised in that the piston (3) has a cylindrical internal axial hollow with pistons (4) located inside it on both sides.<IMAGE>
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