| 摘要 |
A lower cover for a bottom discharge outlet structure of a hopper, particularly for a covered hopper railway car, positioned beneath a butterfly valve which controls the discharge of lading from the hopper. A locking arm is pivotally carried from the underside of the cover and a cam type lock is effected between the ends of the locking arm which extend beyond the cover and coacting lugs on the adjacent housing whereby upon rotation of the arm in one direction when the cover is beneath the bottom discharge opening the cover is drawn tightly against the housing in generally air-tight relation to releasably lock the cover in position. Upon rotation of the locking arm in an opposite direction, the cover is released and may be pivoted to an open position remote from the discharge opening to permit the gravity unloading of lading.
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