Trencher chain digger bucket assembly

Claim 1

IN COMBINATION WITH A DRIVEN TRENCHING MACHINE, AN ENDLESS SPROCKET SUPPORTED AND POWER DRIVEN TRENCH DIGGING CHAIN, A GENERALLY U-SHAPED BUCKET CARRIED BY A LINK OF THE CHAIN, SAID BUCKET BEING OPEN AT ITS FORWARD AND AFT ENDS, SPACED DIGGING TEETH FORMED ON THE FORWARD END OF SAID BUCKET AND ADAPTED TO CUT INTO AND EXCAVATE DIRT AS THE LOWER FLIGHT OF THE CHAIN MOVES UPWARDLY, A TRANSVERSLEY DISPOSED REAR END PLATE CARRIED BY A SEPARATE LINK OF THE CHAIN REARWARDLY OF THE BUCKET CARRYING LINK, SAID TRANSVERSELY DISPOSED REAR END PLATE BEING PROVIDED WITH A CUT-OUT PORTION INTERMEDIATE ITS ENDS FOR NORMALLY ACCOMMODATING A LINK OF THE CHAIN INTERMEDIATE SAID BUCKET CARRYING LINK AND THE REAR END PLATE CARRYING LINK, SAID REAR END PLATE NORMALLY STRADDLING THE CHAIN AND BEING SPACED FROM THE OPEN AFT END OF THE BUCKET, A TRANSVERSELY DISPOSED CLEAN-OUT PLATE CARRIED BY A SEPARATE LINK OF THE CHAIN FORWARDLY OF THE BUCKET CARRYING LINK, SAID TRANSVERSELY DISPOSED CLEAN-OUT PLATE NORMALLY LYING ADJACENT THE CHAIN AND EXTENDING PARTIALLY INTO THE FORWARD END OF THE BUCKET WHEREBY WHEN THE