Hatch assembly with removal hatch cover

A hatch assembly with a removable cover which is rotatable between an open and a closed position, said hatch assembly comprising a frame member defining an opening therein, a two-piece hinge assembly and a removable cover rotatably attached to said frame member by said hinge assembly for rotation about said hinge assembly between an open position and a closed position wherein said cover is superimposed on said frame member, said two-piece hinge assembly including a first hinge element having a generally flat plate portion for attaching said first hinge element to a hatch assembly, a plurality of longitudinally extending generally J-shaped pivot members and a plurality of upwardly extending support members connecting said J-shaped pivot members to said plate portion, said generally J-shaped pivot members including a rounded base portion and a rounded opposite or top portion with the same radius of curvature as said base portion, and a second hinge element including a longitudinally extending generally cylindrical recess defining a right circular cylinder with a longitudinal slot along one side thereof, said generally cylindrical recess having a curvature of surface which is slightly larger than the radius of curvature of said base portion and said opposite or top portion to allow said pivot member to rotate therein with a relatively snug fit and a plurality of transverse slots across said longitudinal slot, and said generally cylindrical recess and said longitudinal slot adapted to receive said J-shaped pivot members through said longitudinal slot and into said recess with said J-shaped pivot members encompassed by said recess when said cover is rotated about said J-shaped pivot members and said transverse slots sized to accommodate said support members as said cover is rotated though an angle of about 120° whereby said cover can be rotated between an open position and a closed position with said J-shaped pivot members retained in said longitudinally extending recess and readily removed from said frame when rotated to said open position.