This post has been edited by vons: 29 May 2014 - 04:51 PM


Integrated Compression Sheave Assemblies
Started by snoloco, May 26 2014 01:36 PM
29 replies to this topic
#27
Posted 29 May 2014 - 08:22 PM
It would have look like this or similar to it. This is a few years older though.
lowerterminal.jpg (67.92K)
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This post has been edited by Nate214: 29 May 2014 - 08:23 PM
#29
Posted 30 May 2014 - 05:04 AM
snoloco, on 28 May 2014 - 12:23 PM, said:
The arrival side must be under greater tension. Some older fixed grips with bottom drive that I have ridden have more depression sheaves on the downgoing side at the drive terminal..... This lift is a bottom, drive bottom tension to my knowledge. I do not build lifts or work on them, but I think that the extra tension on the down line in a bottom drive installation may be enough to warrant extra sheaves on hold downs. I have not noticed this on any top drive lifts I have ridden.
There is a difference in load on a bottom drive/tension lifts, more than a bottom return. Think about a bicycle sprocket; the chain on the top is super tight when you're pedaling yet the chain leaving the bottom hangs loose. Also designers consider worst-case loads, so the loaded chairs leaving the terminal pull down more than the empty ones coming in.
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