The Tiger's turret was redesigned and simplified in July 1943. One of the many improvements was a new locking device to lock the turret in place for travel.
This photo shows the new lock, which was almost identical to that in the Tiger II. It consisted of a wheel attached to the turret, that tightened a ratchet against the gear teeth in the turret ring (which were attached to the hull).
This diagram from the Turret Manual [1, see plate 18] shows how the device worked. The ratchet and the turret's gear teeth are shown at bottom; the turret's armoured wall is at the extreme right.
This CAD model of the turret base shows the relation of the lock to the turret's gear teeth.
[2] Factory drawing 2AKF31861U1B11: Turmgehause (overall turret armour)