초록 ▼

A closed railroad hopper car for solid commodities is loaded through hatches at its top. A pivoted lid or cover on each hatch is held shut by a single quick-acting cam lever. A catch prevents pressure in the car from throwing the hatch cover open when the tension from the cam lever is released. The

A closed railroad hopper car for solid commodities is loaded through hatches at its top. A pivoted lid or cover on each hatch is held shut by a single quick-acting cam lever. A catch prevents pressure in the car from throwing the hatch cover open when the tension from the cam lever is released. The hatch cover cannot be opened until after the cam lever is moved transversely out of contact with the catch.

대표청구항 ▼

A hatch for a vessel holding a commodity under pressure, comprising: A. a ring having an upper surface surrounding an opening through said vessel, said ring extending upwardly beyond the upper surface of said vessel; B. a hatch cover above said ring having an underside for closing said opening, gask

A hatch for a vessel holding a commodity under pressure, comprising: A. a ring having an upper surface surrounding an opening through said vessel, said ring extending upwardly beyond the upper surface of said vessel; B. a hatch cover above said ring having an underside for closing said opening, gasket means sealing the underside of said cover against the upper surface of said ring; C. an elongated handle attached to the top of said cover, opposite ends of said handle projecting beyond the periphery of said cover, hinge means connecting one end of said handle to said ring so that said cover is pivotable toward and away from said ring to close and open said hatch, there being a longitudinal slot in the other end of said handle; D. means for latching said cover in closed position against said ring comprising a cam lever having one end pivotally attached to one end of a connecting link, means attaching the other end of said link to said ring in such a manner that said link is pivotable toward and away from said handle longitudinally of said handle and in such a manner that said link is movable transversely of said handle, said link being receivable in said slot in said handle, a cam surface on an underside of said lever for bearing against an upper surface of said handle adjacent said slot when said link is received in said slot and said lever is pivoted toward said handle, whereby said link is tensioned so as to hold said cover in closed position; and E. means for venting pressure in said vessel and preventing sudden opening of said cover, comprising a safety catch projecting beyond said other end of said handle, said catch being attached at one end to said handle, said catch having an upper surface spaced below an upper surface of the handle said handle at its other end so as to define a notch that extends transversely of said handle, said notch merging into said slot forming an angular configuration, said catch engaging said lever when said link is in said slot and said link and said lever are pivoted away from said handle, said lever being disengagable from said catch for pivoting of said hatch to its fully open position only after said link is moved transversely of said handle out of said notch, the upper surface of said catch is spaced vertically below said upper surface of said handle adjacent said slot, whereby when a portion of the cam surface of said lever is pivoted into engagement with said catch said cover may pivot open a slight amount and thereby vent pressure in said vessel.