Quote:
Originally Posted by Cash4587
I assume there are points on the rigging that are attached to make this go up and down?  It looks like on the bottom of the first moving stage and then the top of the cross bar for the carriage? Also wouldn't you be able to make this with one continuous loop of rigging versus one closed loop and one powered loop attached to the spool? |
The two anchor points are to the bottom of the first stage, as you said, and then to the crossbar at the top of the stationary stage that you can see in the other picture.
This is a variation of a cascade rigged elevator, which had a continuous load on the lift string, unlike a continuous elevator, which makes control loops a bit easier. However, with a traditional cascade elevator, the return string comes in twice as fast as the string lifting the elevator, so the spool needs to have two different diameters. With this setup (two separate loops), you get the benefit of the constant load of the cascade with the single diameter drum of the continuous, with the disadvantage of a bit more complex rigging system.
There's a bit more information in this thread (along with the diagram from Jared341 which inspired this rigging method):
http://www.chiefdelphi.com/forums/sh...47#post1201847