| 摘要 |
<p>The cover (B) is mounted on eccentric wheels (1) on a shaft (12) around which it moves to open or close the cover. The closed cover is locked in position by the movement of a piston (15), which acts against a cam (13), to rotate the shaft so the eccentric wheels push the cover forwards, pushing feet at its front (not shown) into hooks (21 and 22) in the rim of the vessel.</p> |
