Boning and defatting rotary knife

An improved boning and defatting knife comprising;

• a blade support unit including a handle, a blade support ring connected to and extending from said handle and a drive means mounted on at least one of said handle and said blade support ring;
• and
• a blade unit including;
• a generally toroidal blade engaging and locking device having a drive means engaging section and a releasable fastening and locking section;
• a generally toroidal blade having an outer locking edge and an inner cutting edge;
• said releasable fastening and locking section of said blade engaging and locking device operative to releasably receive and lock said outer locking edge of said blade thereon, whereby said blade is removable and replaceable;
• said blade unit being adapted to be removably and rotatably seated on said blade support ring with said drive means engaging said drive means engaging section of said blade unit such that said blade unit is rotated within said blade support ring by said drive means;
• and
• a friction-reducing material mounted between said blade support ring and said blade unit such that said blade unit rotates with reduced friction within and on said blade support ring.