| 摘要 |
<p>A generally circular cover for closing a hatch opening in a railroad car hopper is connected to a diametral support bar for limited pivotal movement to provide uniform gasket loading between the cover member and the hatch coaming. One end of the support bar is hinged to the hopper roof and the opposite end includes a cam surface and laterally projecting retaining pins for engagement with a latch member. The latch member has a somewhat channel shaped portion pivotally connected to a link which, in turn is also pivotally secured to the hopper roof. The link includes opposed trunnion portions which are engageable with the cam surface to forcibly engage the support bar to hold the hatch cover closed. The latch member includes open ended slots which are engageable with the retaining pins in such a way that the latch member will not disengage from the support bar when the latch member is swung to the release position if fluid pressure within the car hopper is sufficient to force the cover toward an open position.</p> |
