Abstract: A security gate drive mechanism is disclosed having a rotating shaft which rotates no more than a single rotation in order to provide through a linking mechanism, a driving force to move a security gate from a first position in which the security gate is essentially fully closed, to a second position in which the security gate is essentially fully open. A driving motor having a drive shaft rotating at much greater than one revolutions per minute, and a reduction gear contained in a reduction gear housing having an input shaft operatively connected to the drive shaft and an output shaft comprising or operatively connected to the rotating shaft, thus reducing the revolutions per minute of the drive shaft to a number of revolutions per minute suitable for operation of the security gate.