I am not so sure it is a pie lifter. Just seems odd for that purpose.
With the curved handles down as you suggest, I think this would be very unwieldy and unstable if lifting something. The one photo you have that shows the two curved ends locked together appears to be a stove lid lifter. The hinged end with that long end out there makes no sense, unless that end fits into a hole or fitting so the "lifter" rotates on that hinged point. I see no reason for the hinge to be extended out so far. It would be in the way of any and everything, especially the back of a fireplace. It would be nice to have a clear patent date. I did search all of 1875 with restrictions (incl. lifter, stove implement, etc.) with no results even close. I also searched Mar-May 1876 with same results. Another conundrum.