Wedged Blind Tenon Joint (Fox Tenon) Plans

This brilliant but challenging joint is the wedged blind tenon, also known as the fox tenon because the two wedges look like ears. The blind tenon goes into a tapered mortise, and as it is driven in, the back of the mortise pushes the two wedges into kerfs in the tenon, splitting it apart to create a captured dovetail that will never come out. This joint holds permanently and does not require glue.