Quote:
Originally Posted by officedweller
Don't know if I'm right or not, but I associate Richmond Elevator with the hydraulic elevators seen in low-rise or mid-rise buildings
- and hydraulic elevators are painfully slow.
(i.e. instead of cables and pulleys pulling from above, they use pistons that push up from the ground, I think)
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Your correct in how a hydraulic elevator works. A oil tank and pump push hydraulic fluid through a series of pipes into the bottom of the elevator hoistway, where it pressurizes a hydraulic jack that pushes the elevator cab up. Releasing this pressure (and oil) back into the tank in the machine room slowly and safely lowers the elevator car. A hydraulic unit can go up to 200 feet per minute before they are not really worth it anymore and one would go to a traction elevator, or the newer MRL (Machine RoomLess Elevators).
Traction or electric elevators work with a rope and pulley system that is counterbalanced on a shiev at usually the top of the elevator hoistway for energy efficiency. Traction units can go well over 1000 feet per minute, and with gearless machines the sky is the limit in terms of maximum speed.
Richmond does a lot of high rise traction's in the GVRD as well as the lions share of hydraulics, probably 35% - 40%.