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Tirfor mechanism

Tirfor mechanism

Tirfor mechanism

(OP)
Can anyone explain to me how a tirfor winch works?  Specifically, how does the mechanism "back down" a load?  A diagram or a picture would be really helpful.  I think I understand the theory behind it but I've never actually seen one.  

Thanks for the help.

RE: Tirfor mechanism

(OP)
Gee, thanks.  

I have tried looking it up, the closest I've found was a partial cut-away view that didn't show much detail.

  http://www.highgearsales.com/Tirfor21.html

I guess I was hoping that someone here might have a little more insight into the specifics of how does the mechanism works while lowering the load.  My understanding is that it is a system involving two sets of cam-type grippers or cleats that alternately grip the wire rope with each cycle of the handle.  For pulling a load, that seems simple enough.  

I guess what I get hung up on is how the load could be pushed through one of these while still gripping with the other in the case of lowering or backing down a load.  That makes me think that maybe my mental picture of two cam cleats is a little too simplistic, or that I'm mis-understanding how the thing is actually used.  

Thanks.

RE: Tirfor mechanism

lmfao. lmgtfy is hilarious!

peace
Fe

RE: Tirfor mechanism

Lifting:

Grip 1, open 2, lift 1, grip 2, open 1, lower 1, repeat

Lowering:

Grip 1, open 2, lower 1, grip 2, open 1, lift 1, repeat    

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