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Check out this compression assembly on the birds of prey lift at BC...I have never seen one that was not symmetrical like this before!

Storm Peak at Steamboat has one like that. I don't understand the need, since typically anything bigger than a four-sheave assembly has a definite positive load on it. But Doppelmayr does things differently...

Other 2/6 compression assemblies:
The Express (Mt. Avila)
The Quad (Belle-Neige)

This ones pretty funny too (from our T-BAR)

a neat one i've seen was similar to that. It is an 8 sheave assembly with 4 sheaves supporting and 4 sheaves compressing but the sheaves are all in a line. Also a Doppelmayr
This post has been edited by edmontonguy: 09 March 2004 - 08:16 PM

...and from H-lift; A-lift and Blackjack each have at least one like this as well.

I may have an explanation... We had to put two support sheaves on tower 4 on Red which most definitely has a negative load on it - the reasoning behind it was depending on how the bottom operator would load the chair, it would set up a line bounce between towers three and four that would cause the haul rope to hop right off the assembly into the rope catcher.

edmontonguy, on Mar 9 2004, 08:15 PM, said:

That's a pretty common assembly on Doppelmayrs; you'll also see them in place of the above Yan assemblies on many lifts that Doppelmayr retrofitted. Doppelmayr and Riblet were alike in that they both used combo assemblies like that even if the load was positive enough to keep the rope on the sheaves without additional help.

The Eagle Ridge quad @ marmot has combination assemblies on almost ever tower. I believe this is because the lift line changes angle so much and is rather steep.

Is this the type of assembly you mean?

Is that a Poma assembly? It sure looks like one.

*points at the logo at the bottom of the pic...* Yup :P

Kind of off topic but kind of on topic too, but how are Poma's new sheave trains greaseless? I mean it seems that they would get hot and burn up.

Allan, on Mar 9 2004, 08:41 PM, said:

I need new glasses B)
As for Poma's new sheaves, etc being greaseless- what that means is that we (the mechanics) don't have to grease them. There is still grease inside the bearing, but it's a 'sealed' bearing, meaning that the grease supposedly doesn't leak out. The assembly bushings are rubber and do not require grease. They're kind of cool in that when you lift the rope off the sheaves, the assemblies don't articulate and smash your fingers

Interesting that the Poma sheave train picture shows a cable catcher both on the upper and lower assembly. Is that standard for towers with compression sheaves?

It is standard - they're on our compression assemblies too... you just never know which way the rope's gonna go :)

On Upper Panorama they have 2 sets of those on a tower, so a total of 16 Combination. I will check if i have a picture.

DV's Jordanelle Gondola has one tower with compression sheaves like the ones on the Birds of prey lift

The Tremblant gondola and the Flying Mile Express have a 8-8 compression too.
This post has been edited by Dr Frankenstein: 14 March 2004 - 04:10 PM

White quad, Mt. Habitant: