Elevator braking system

greenspun.com : LUSENET : Elevator Problem Discussion : One Thread

Hi i am an university student and i was recently given a project about Elevator braking system.

1) What kind of emergency braking systems are there in hydraulic elevators? Supposing something happened to them and they were coming crashing down what kind of saftey precautions are in the elevators?

2)What kind of things would cause the elevator to come down?

3) Which elevator system is less cost effectice Traction or hydraulic?


-- Taha Patoli (patolit@muss.cis.mcmaster.ca), January 14, 2004


1).Adams Elevator Life Jacket 2) Ruptured pipe,Cylinder failure,Stuck valve components. 3)Application must be taken into account,Rise ,use,space,ect....

-- Steve (vette69@comcast.net), January 14, 2004.

Good morning Taha, There are several types of hydraulic lifts, for example with ropes or ropeless, with hole or holeless. For each type the devices to prevent the elevator car from falling may be different. But commonly there are two devices: -the safety valve will be electronically activated whenever there is an overspeed; -the safety gear will be mechanically activated when the rope set become untolerable. And the car will be locked against the guide rail.

Another common safety device is the shock absorber also called buffer. It can be spring type or oil type and installed at the pit of the shaft. This safety device will be helpful whenever the lift cage overrun in the downward direction.

Please have a look at http://science.howstuffworks.com/elevator.htm.

-- Sanouk CHOUNLAMANY (sanouk@techemail.com), January 23, 2004.

In the case of a hydraulic line breaking, the elevator will fall. The buffer at the bottom of the shaft will do nothing to prevent human injuries. There are hydraulic elevators that travel as high as 10 floors. If the pipe should come apart at a joint, or a fitting should fail, these elevators can fall and anyone inside, will be severely injured. There is a device on the market now that can prevent these injuries. But until it becomes law, building owners will not be using it. It is the Adams "Life Jacket".

-- Harry Hamilton (jarvis1@shaw.ca), February 23, 2004.

Anyone ever installed a life jacket? How'd it work out?


-- Dan (justsomeguylookin2@hotmail.com), February 25, 2004.

Moderation questions? read the FAQ