March_1971 — Page 42

SNOW WINBOW

CANOP

(ARVEYOR

BUILDINGS

(ALVEYOL

"LIGHTS

PUBLIC SIDEWALK.

7th STREET

PUBLIC SIDEWALK-

Artist's conception of an overhead route

ing rate (1 mph per sec or 1.81 fps per sec) is likewise constant and causes no discomfort.

Driving method

The system is mechanically inter- connected, the number of individual electrical drives being minimised with power delivered through various line- shaft and chain arrangements.

Horsepower demand in the system is quite constant varying little from an empty to a full load, and in either case, is quite small compared to that employed in conventional systems.

All drive motors would be located in groups at station areas. In each area there would be switch houses that would include circuit breakers, motor- operated drum controllers and resis- tors. At some point there would be a master control station, with an ‘opera- tion board' similar to that used at a central control point in railroad opera- tions.

At the master control station all of the drives would be started or stopped simultaneously. The necessity for con- tinued uninterrupted service calls for elaborate provisions to isolate trouble and facilitate determining its location, in order that corrective action might be taken immediately. Indicating lights inform of overload on any motor, a tripped circuit breaker, or any drive that has stopped due to low voltage or the functioning of some protective or

Far East BUILDER, March 1971 Page 42

END VIEW

CAR

0000

Cross section of unit at acceleration point

interlocking device.

Overload relays would not stop the system except as a last resort to pre- vent breakdown of a motor. All the relays would be designed to register moderate overloads first by means of indicating lights and to open the cir- cuit only when the actual danger point is reached. As the motors normally would be loaded considerably under capacity, there would be sufficient time to take corrective measures be- fore the trouble would necessitate shutting down the system.

Emergency stop buttons would be strategically placed along the system within easy reach of platform guards or maintenance men and inspectors. The master control station also would have a close-circuit TV system scan- ning each station and other critical

areas.

RUBBER TIRED LIVE ROLLERS

SIDE VIEW

structed overhead or underground to avoid conflict with surface movement. Because the load is uniformly distri- buted, the unit loading of a system is so small that a very lightweight struc- ture can support it over the pavement or kerb line, or it could even pass through buildings at the second floor level.

If above pavements, there is no massive, unsightly structure but a structure that blends in with its sur- roundings on which the system operates noiselessly. The short length of the cars makes it possible to turn present street corners on short-radius curves.

When constructed overhead ΟΙ underground, the system would not re- quire any elaborate signal system; cars are spaced automatically and the con- trol of the movement of cars is built

The Carveyor system can be con- into the drive equipment.

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