The Vacuum Elevator is an interesting way of lifting a small elevator cab.
A valve regulating inflow of air in the upper part of the shaft controls the pneumatic depression and enables descent. When the valve lets in air (at atmospheric pressure) into the low pressure chamber, the vacuum elevator cab will safely lower to the desired level. This valve also controls the speed of the cab.
The lower part of the shaft is open to ensure free entrance of air at atmospheric pressure. The air suction process simply consists of a suction device that sets the difference in pressures between the atmospheric and that inside the shaft limited by the piston, the side walls and the upper end.
The vacuum elevator cab has locking devices included in the interior of the shaft to stop the cab at the upper and lower limits of travel.
For better safety conditions, a braking system located on the roof of the car activates in case the tube above the vacuum elevator cab has a sudden return to atmospheric pressure. The braking system is made up of either a diaphragm or piston.”
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