| 摘要 |
A manway is defined by a cylindrical portion of a vessel wall and is closed by a cover pivotally movable between open and closed positions by means of a hinge mechanism including external brackets on the cover and the wall portion interconnected by a hinge pin. The opposite ends of the hinge pin carry bushings, on which are respectively disposed two torsion springs. Each spring has a vessel wall end portion disposed parallel to the hinge pin, the vessel wall end portions being respectively received in the opposite ends of a coupling sleeve engageable with bearing surfaces on one of the brackets. The other ends of the two torsion springs are respectively disposed generally perpendicular to the hinge pin and are received slidably through eyebolts fixed to the cover bracket.
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