Abstract: A bottom hinged side door of a truck body which is associated with an automatically locked-closed top cover of a tool tray disposed directly above said door, the locking of said cover being relaxed upon the opening of said door.

Abstract: The structure disclosed embraces a pair of vertical angle iron brackets welded to the rear ends of side walls of a truck service body in the plane of the rear end opening of the latter. A rectangular sheet metal tail gate having tapering end flanges welded thereto, the latter being provided with upper and lower pairs of laterally extending bolts, the lower pair of which extend laterally into vertical slots in the lower portions of said brackets and the upper pair of which extend laterally into notches formed in the upper ends of said brackets. The tail gate is normally held in vertical position closing the rear end of the truck body and is adapted to be readily shifted to horizontally rearwardly extending position by lifting said tail gate to remove the upper bolts from said notches and then swinging it downwardly until the wider lower ends of said end flanges abut against lower end portions of said brackets, this rigidly supporting the tail gate horizontally.

Abstract: A structure comprising two interlocking hollow semi-cylindrical elements, one of which is larger than and encloses the other, and formed respectively by stamping operations from the material of contiguous edge portions of two sheet metal plates, which structure prevents broadside separation of said plates while allowing free relative articulation through an angle of 180.degree., and producing a tight joint between said plates at each extremity of said articulation and being free of sharp edges when said hinge is either in closed or open position.