Patent GB-1390828-A (GB)
Title: Transport system
IPC: B61B13/00
Filed: 1972-04-19
Abstract: 1390828 Transport control system BATTELLE MEMORIAL INSTITUTE 19 April 1972 [20 April 1971] 18221/72 Heading B7M In a transport system comprising a series of closed loop tracks T 1 , T 2  ... T n  each including departure stations E, E<SP>1</SP>, arrival stations D, D<SP>1</SP>, outward and inward tracks B 1 , B 2  and a pair of recycling track sections B 3 , B 4 , which are at a lower level than the tracks B 1 , B 2 , the loops are connected to at least one vehicle distributor and storage closed loop track A by means of vehicle supply and vehicle withdrawal tracks whereby vehicles can be supplied to or withdrawn from each loop in response to transport demands. The vehicle are basically U-shaped in section, each having a base 1 and two side members 2 which allow it to ascend, e.g. at departure station E, from recycling track B 3  up ramp track Br below the passenger entry walkway, and with its sides to each side of the walkway, to the outward track B 1  where passangers walk on to the vehicles in the direction of vehicle movement, e.g. as on to an escalator. The passengers then walk along the vehicle formed corridor to the lead vehicle with its forward end closed by sliding doors. Then either automatically or manually the rear sliding doors of the lead vehicle are closed and it is ready to move off along track B 1 . The vehicles run on wheels R and are driven by a linear motor arrangement with the coils on the track. The pitch of the coils and the frequency of the power supply are set to provide acceleration and deceleration at the departure and arrival stations respectively. The system is provided with a central computer 0 which is fed with information relating to the number of vehicles in a loop, e.g. T 1 , which is updated by counters Ca, Cd counting vehicles entering or leaving the loop for vehicle distribution and storage loop A. Two further counters Ce 1  and Ce 2  at the entry stations E, E 1  provide information to the computer on the number of passengers requiring transportation. From this information the computer controls the supply of vehicles to or withdrawal of vehicles from a particular loop by issue of signals on outputs Oa, Od respectively. Assuming vehicles have to be supplied to loop T 1  the output signal on Oa is coupled via branches Oi and Oe to control members Ki, Ke controlling respectively the entry of vehicles from track A to supply track Ba and from the supply track to the loop T 1 . Proximity switches OU inform unit Ke when the supply track Ba is free to accept a vehicle so that junction switch J 3  can be operated to route a vehicle in the loop A to the supply track. Proximity switches OU associated with control unit Ki monitor vehicle presence on the loop T 1  upstream and downstream of the junction J 1  and when these indicate that the section Z 2  is free a stop and drive means P is energized to move a vehicle in the supply track into the loop. Withdrawal of vehicles from the loop via track Bd is controlled in a similar manner. When the computer issues a supply or withdrawal order it issues an order via outlet OC to energize the linear motor inductors of the distributor and storage track A. At the departure station E 1  the presence of vehicles in the upstream and downstream regions Ze 1  and Ze is detected by elements L 2 , L 1  coupled to control member KA which controls release of the vehicles. Even under busy conditions a minimum number of vehicles must be retained at the station, a vehicle then being released when element L 2  detects the arrival of another vehicle from the recycling section B 4 . At quiet times the section B 4  fills until a detector Cp 2  indicates that the track to this point is occupied whereat via member KB signals are issued to control unit KA to release vehicles, even when unoccupied to prevent further build up in the recycling track. When detector EB detects arrival of a vehicle at arrival station D<SP>1</SP> control member PB is actuated to move the vehicles retained at the exit station by one vehicle position. Each time a passenger enters station E or E 1  a detector Ce 1 , Ce 2  is actuated to trigger and reset a delay device t to zero. If no reset signal is received the device t operates switch TA after the delay has expired and switches off the power supply to the loop.