If it helps, the device was featured in Disney's "The Three Musketeers" with Keifer Sutherland, Charlie Sheen, and Oliver Platt. When Porthos (Platt's character) was in the dungeon near the end fighting the big ugly torture guy, he killed him in one of these devices by impaling him between the two.
Sorry - I know this is kind of a weird request but I haven't had any luck with Google or Wikipedia and figured someone on here might know.