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SYSTEMS PREPARATION QUESTIONS 2007 - 18
 
V. Ryan 2007-2017
 
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The drawing below shows the sliding doors of a train carriage. However, these trains are rather old and the electric circuits are constantly breaking down. This leaves the doors stuck open or shut. The designers are considering a mechanical backup system that would allow the train guard / porter to open and close the door in the event of an emergency.
 
 
 
 
The two doors are shown below. Add to the drawing a suitable mechanical system that would allow the doors to be opened and closed in the event of an electronic failure. Add explanatory notes and labels.
 
 
POSSIBLE ANSWER
 
 
 
 
NOTES: A rack and pinion mechanical system could be used to open and close the doors. A special handle would be placed into the pinion. This would give leverage allowing the pinion to be turned manually. Each door could be opened or closed if the electronic system failed.
The handle would be carried by the porter / train guard. A sample handle is seen below.
 
 
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