| 摘要 |
A workpiece carrier is supported for tilting travel about a substantially vertical axis upon an arcuately spherical universal pivot, which pivot rests upon a seat having a corresponding sphericity. The seat surmounts an annular pedestal situated upon the top surface of a housing. An annular clamp concentrically encircles the pedestal, and has limited, reciprocable, vertical travel thereon. Drive means is provided to urge the clamp in downward travel to a carrier restraint position. A portion of said annular clamp is adapted to engage the carrier in the restraint position to resist tilting travel of the pivot.
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