Replaceable cutting edge for a blade assembly

Claim 1

A BLADE ASSEMBLY COMPRISING: A MOLDBORAD PROIDING A FORWARD WORK ENGAGING WALL HAVING A LOWER EDGE DEFINED BY AN ANGULARLY DISPOSED REARWARDLY DIRECTED FLANGE, AND AN OFF-SET WALL SUBSTANTIALLY PARALLEL TO SAID WORK ENGAGING WALL DEPENDING FROM SAID FLANGE AND DEFINING A SEAT; A DETACHABLE BLADE HAVING AN UPPER PORTION ENGAGING SAID SEAT, SAID BLADE HAVING AN UPPER EDGE AND CARRYING A PLURALITY OF SPACED LUGS INTEGRAL THEREWITH, EACH SAID LUG BEING PRISMOIDAL, HAVING REARWARDLY DIVERGENT WALLS, AND PROJECTING FROM SAID UPPER EDGE; SAID OFF-SET WALL CONTAINING AN OPENING DEFINING A PASSAGE FOR EACH SAID LUGS, EACH OPENING BEING BOUNDED BY WALLS AND INCLUDING A REDUCING PRISMOIDAL SOCKET PORTION FORMED IN ONE OF SAID BOUNDING WALLS, COMPLEMENTING AT LEAST ONE OF SAID REARWARDLY DIVERGENT WALLS; AND LOCKING MEANS COMPRISING ELEMENTS RECEIVED IN SAID OPENINGS AND ENGAGING SAID LUGS, SUBSTANTIALLY FILLING SPACES BETWEEN SAID LUGS AND OPENING WALLS, MAINTAINING DIVERGENT WALLS OF SAID LUGS IN CONTACT WITH SAID COMPLEMENTING WALLS RESPECTIVELY, TO LOCK SAID MOLDBOARD AND BLADE TOGETHER.