About this detail of the Tiger
The loader in the Tiger 1 was provided with a comfortable seat, unusual for German tanks. The seat was fixed to the box and, due to lack of space, faced to the rear. This diagram shows the location of the seat from above. (This is one of the first 200 turrets, with a low number of bolts on the ring. )
This shows the seat position from the side.
This shows the seat position from the rear.
The seat could be folded up and rotated out of the way. This shows the seat in the deployed configuration.
The seat base had a bracket threaded onto the tubular support. It was locked in place by another bracket. If you lifted it, it would rotate freely. The L-shaped support arm could also be lifted and rotated. A lug at the top gave it two locked positions 90 degrees apart.
Two bolts on the tubular frame attached the seat to the box, as seen here.
This is the seat from the Bovington vehicle. The black leather cushion for the base, which was held in place by straps, is missing. The paint colour is the standard blue/green.
The above diagrams show only the first kind of seat. When the turret was redesigned with a new cupola, simpler stamped-metal seat pads were substituted for the welded ones. The rest of the seat was unchanged.
[1] Survey of Tiger 250122, at Bovington museum, by David Byrden