Patent ID: 7992346

Claim:
A drive device in combination with a sliding door system comprising at least one door leaf guided along a transom, the drive device comprising: a housing mountable on the transom; a pulley, the pulley being rotatably mounted on the housing and having a flange with locking elements, the flange having a surface facing the housing, the locking elements being adjacent to the housing and comprising teeth on the surface of the flange; an endless traction mechanism guided around the pulley for moving the at least one door leaf linked to the traction mechanism; complementary locking elements movable relative to the housing to engage the locking elements on the flange and thereby prevent rotation of the pulley; an electromechanical actuation device which moves the complementary locking elements toward the locking elements in response to an impulse emitted by a locking control, the electromechanical actuation device comprising a push rod and a locking bolt supported by the housing and displaceable by the push-rod; an axially movable toothed disc having mating teeth which form the complementary locking elements; and compression springs urging said toothed disc to abut against the housing; wherein the toothed disc is movable toward the flange of the pulley against forces of the compression springs.