I'll go with its being a spreader.
Note on the second one, one of the arms of the rotating piece is broken off, probably from that end's being hit with a hammer to have the tapered edges get a bite into something like the area between a cylinder head and block. Or, the arms themselves being hit for extra force to break a seal.
A bolt through the two holes with two nuts between the blades, rotated, would give additional spreading force.