The guide mechanism on either side of the door leaf is with the inclusion of the door leaf is a six-membered crank gear, which consists of the four-membered basic gearbox A 0 ABB 0 and the two-stroke ADC. Of each gear half the weight G 6 = 0.5 x 600 N = 300 N is included, it attacks the center of gravity S ≡ S 6 of the door leaf sixth