I have exhaustively search for a "mechanical phrase" to describe what a "drawbore" actually does...I agree too Sean..drawborn trunnell/pegs...by their overall affect and geometry...are not wedges...as the one I employ are typically square and only sometimes round...both are only tapered about 25mm to 30mm at most.

What is the mechanical effect they do have???

I have seen some (limited) text that use the term "wedge" in relationship to them but considering the "text" this was published in and the authors I don't give it much countenance, as these where "novice articles" about timber framing joints, described by "non" Timberwrights.

One my mentors (Amish) referred to it in broken Dutch to English as a "spring shaft" effect, but I feel that might be to much local vernacular even though it does describe the mechanics of how the peg/trunnel functions once driven home.

So...the best I can come up with for "mechanical force" is in the name itself..."drawn" or "pulled"...by means of offset mechanical action between the planes of to passing members...There has to be a way to shorten that...??..So, perhaps "drawn joint" is simply the best?

Then again...a wedged joint is a "drawn joint" by the..."effect of an inclined plane."

While a trunneled or pegged joint is working as an "offset"...??...shear plane, or cam...It would seem?