Self-dumping bucket with removable bail

Claim 1

MATERIAL HANDLING APPARATUS COMPRISING A BUCKET HAVING VERTICAL SIDE WALLS AND END WALLS, AND A NORMALLY HORIZONTALLY DISPOSED BOTTOM, A TRUNNION PROJECTING OUTWARDLY FROM EACH OF SAID SIDE WALLS IN A COMMON HORIZONTAL PLANE, SAID TRUNNION BEING OFFSET TOWARD ONE OF SAID END WALLS TO ONE SIDE OF A VERTICAL PLANE EXTENDING TRANSVERSELY THROUGH THE CENTER OF GRAVITY OF THE BUCKET FROM ONE SIDE WALL OF THE OTHER AND BELOW A HORIZONTAL PLANE EXTENDING TRANSVERSELY THROUGH THE CENTER OF GRAVITY OF THE BUCKET FROM ONE SIDE WALL TO THE OTHER, A PLATE AFFIXED FLATWISE TO THE OUTER SURFACE OF EACH OF SAID SIDE WALLS, THE UPPER EDGE OF EACH OF SAID PLATE EXTENDING IN AN ARC ABOUT ONE OF SAID TRUNNION FROM A POINT ADJACENT THE BOTTOM OF THE BUCKET AND SAID ONE OF SAID END WALLS TO A POINT ADJACENT THE TOP OF THE BUCKET BEYOND THE VERTICAL PLANE CONTAINING SAID TRUNNIONS, SAID TRUNNIONS PROJECTING BEYOND SAID PLATES, A RAISED GUIDE RIB ON EACH OF SAID PLATES EXTENDING PARALLEL WITH THE UPPER EDGE THEREOF FROM A POINT ADJACENT THE BOTTOM OF THE BUCKET AND SAID ONE OF SAID END WALLS TO A POINT ADJACENT THE TOP OF THE BUCKET BUT SHORT OF THE EDGE OF THE PLATE OPPOSITE SAID ONE OF SAID END WALLS, EACH OF SAID PLATES HAVING A VERTICAL OPENING THEREIN EXTENDING DOWNWARDLY FROM THE TOP EDGE OF THE PLATE IN VERTICAL ALIGNMENT WITH ONE OF SAID TRUNNIONS, A GENERALLY U-SHAPED BAIL HAVING TWO SPACED LEGS AND A WEB CONNECTING SAID LEGS AT ONE END THEREOF, OPPOSED GUIDE SLOTS ONE ON THE INNER SURFACE OF EACH OF SAID LEGS INTERMEDIATE THE ENDS THEREOF, EACH OF SAID LEGS HAVING A NOTCH IS THE BOTTOM THEREOF FOR ROTATABLY RECEIVING ONE OF SAID TRUNNIONS, AND A LATCH MEANS SLIDABLE ON THE INNER SURFACE OF SAID LEGS FROM AS FIRST POSITION EXTENDING PARTIALLY ACROSS SAID GUIDE SLOTS AND A SECOND POSITION CLEAR OF SAID SLOTS, SAID BAIL BEING REMOVABLY MOUNTED ON SAID BUCKET WITH SAID LEGS STRADDLING SAID SIDE WALLS AND SAID TRUNNIONS RECEIVED IN SAID NOTCHES AND SAID RIBS RECEIVES IN SAID GUIDE SLOTS, SAID LATCH MEANS BEING ADAPTED TO FIT IN SAID OPENINGS IN SAID PLATES FOR LOCKING SAID BAIL IN UPRIGHT POSITION, SAID BUCKET BEING PIVOTABLE ABOUT SAID TRUNNIONS WITHIN SAID BAIL WHEN SAID LATCH MEANS IS NOT FITTED IN SAID OPENINGS, AND STOP MEANS ADJACENT THE ENDS OF EACH OF SAID RIBS FOR LIMITING THE PIVOTAL MOVEMENT OF SAID BUCKET.