47 the gear 50 is in line with the arched sill plates 23 which extend between the towers the right hand tower 19 has a base housing 19a which encloses the lower end of the pivot post 30 not shown for the gate section 21 is exactly the same manner shown in fig5 and a duplicate gear not shown like gear 50 is provided each gear 50 is engaged by a suitable length of sprocket chain which has its opposite ends connected to the cables 24 and 24a the cables 24 and 24a are adjusted for tension by turnbuckles 25 so that the gears will simultaneously swing the gate sections 21 and 22 between closed and open positions the cables and turnbuckles are protected by the arched sill plates 23 for free movement the upper end of the pivot post 30 is mounted in a bearing which is a duplicate of the upper bearing 46 on the left hand tower 20 in fig5 and 7 the drive means between the motor 40 and the gate sections includes the drive pulley 44 and the driven pulley 49 the latter being on the same shaft with gear 50 the ratio between the pulleys may be about 9 to 1 for example the drive pulley 44 may have a two inch pitch diameter and the driven pulley 49 may have an eighteen inch pitch diameter the gear 50 will then rotate with the driven pulley 49 at the low speed thereof the drive motor.