I think I found it. Patent 1,111,103 was granted on September 22, 1914 to Carl Shields of Rock Island. Patent itself does not say he was an assignor, EDIT: but DATAMP says Rock Island was the manufacturer based on the fact that Shields was a co-founder. Link to DATAMP page
here, and once you're there, you can click on the PDF link to read the full patent on the USPTO site.
That's a really nice find. Love the shape of the floating jaw and the spindle mechanism.