Late Victorian Antique Steel Rack Woodworking Vice can be used one handed. 

This was in my dad's workshop and he was a Joiner who started at 14 years old and was still woodworking into his 80's. I have greased it and it works very smoothly.

The information below is from David Barron Furniture Blog:

The earliest form of quick release vice dating from late Victorian times.

To operate the lever is turned to vertical and the jaw slides easily in and out. Once the item to be clamped has been closed down, a third of a turn downwards clamps it tight by virtue of a cam mechanism. It has no thread but works very well and it's big advantage is that it is completely one handed

This one has a 9" jaw and a 12" opening which was about the largest size made. It weighs about 35 kg (75 lbs)

Collection Only from County Durham DH2