E-Ray, it's possible that the grates are the types Vermont Casting used in the Vigilant Coal series. They are hanging grates that move back and forth when the end that the grates interlock with is rotated in a short arch.
From the inside, the total assemblage looks something like this (sorry it's dark):
Either the front or the back bar will rotate thru a short arc moving and lifting the grates. In the Vigilant, the back piece of "dental work" moves the grates forward and back.
Every other grate is cast differently and hooks over the rotating bar on alternating high and low spots. Moving the back bar causes them to lift, fall and move to the front or back
Want to see how they move, just watch the first 20 seconds of the video linked in my signature line below, the one about the smaller fire box in the VigII. Crappy video but it gets the point across
**Edit to answer E_Ray's question posted before this edit: Can't yet tell on the stove in this thread. Mine has a rod that comes out the front - push-pull.
Just my thoughts...