dannyr
Established Member
Here goes, nabs, three pix, I have more, from when building the bench last year.
I actually think the Syers may be the simplest version of QR - I forget the sequence - could the other patents have been to get round this one? - there is a long fixed rack and the axially rotating bar operated by the lever has a segment of multi-start helicoid thread affixed.
Thus the moving jaw on this bar moves freely back and forth if the lever is vertical (say, this free position can be chosen by a fixing screw) until in clamping position, then rotate clockwise to engage at about 30deg and good pressure by say 60-90deg. This works very well for clamping wood. Something very squashy might compress so much that you'd overshoot and release, likewise trying to use the vice to say, slowly force in an oak dowel over a long distance of travel - I just use it for holding wood or tools and it works very well. It all seems well machined (the slideways aren't to the kind of fine tolerance some US piano-makers metal (non-QR) bench vices seem to have been in the 19thC, but they are long and solid).
two more pix coming
rgds
danny