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Sheave assembly configurations

Started by DonaldMReif, Feb 25 2012 10:56 AM

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#1 DonaldMReif

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Posted 25 February 2012 - 10:56 AM

I happened to be in Crested Butte last weekend, and noticed that on Paradise and Silver Queen, they have steep ascents where an 8C/4S wheel assembly is used on the towers. This occurs at tower #10 on Paradise (climbing over the chutes) and towers #20 and #21 on Silver Queen (for the final ascent before the mellow last leg to the top).

Tower 21 on Silver Queen:
Attached File  SAM_3559 Resized 2.JPG (1009.14K)
Number of downloads: 102

I post this because I'm interested to know if these configurations of wheel assemblies are common on high speed quads. These are the only two I've noticed with this configuration. I just wonder why make them into combination assembly towers (cable is supported and held down) instead of depression towers (with the cable only being held down), unless to provide additional support to the cable.
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#2 liftmech

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Posted 25 February 2012 - 11:48 AM

I'm sure the engineers can give a better explanation than I can here, but I can tell you it has a great deal to do with the both the tension and the profile of the lift. The rope will behave diferently loaded than unloaded, and as loads change on adjacent towers it affects this particular one as well. As I recall, there's a definite change in rope angle here, but it's not as abrupt as it would be at most lifts' tower 1 where you'd see a pure hold-down assembly. Riblet used combination assemblies exclusively in these applications, even on tower 1.
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#3 Kicking Horse

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Posted 25 February 2012 - 10:44 PM

View PostDonaldMReif, on 25 February 2012 - 10:56 AM, said:

I happened to be in Crested Butte last weekend, and noticed that on Paradise and Silver Queen, they have steep ascents where an 8C/4S wheel assembly is used on the towers. This occurs at tower #10 on Paradise (climbing over the chutes) and towers #20 and #21 on Silver Queen (for the final ascent before the mellow last leg to the top).

Tower 21 on Silver Queen:
Attachement SAM_3559 Resized 2.JPG

I post this because I'm interested to know if these configurations of wheel assemblies are common on high speed quads. These are the only two I've noticed with this configuration. I just wonder why make them into combination assembly towers (cable is supported and held down) instead of depression towers (with the cable only being held down), unless to provide additional support to the cable.


Seems to me a few lifts in CO have this setup... The lifts are escaping me right now!
Jeff

#4 aug

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Posted 26 February 2012 - 03:44 PM

I have seen them on quite a few instalations..
"Maybe there is no Heaven. Or maybe this is all pure gibberish—a product of the demented imagination of a lazy drunken hillbilly with a heart full of hate who has found a way to live out where the real winds blow—to sleep late, have fun, get wild, drink whisky, and drive fast on empty streets with nothing in mind except falling in love and not getting arrested . . . Res ipsa loquitur (it speaks for it self). Let the good times roll." HT
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