twisted clevis

[taingeil]

I sometimes like to use a mechanical ascender (Gibbs) on a rope lanyard, especially in pitchey white pines. Those of you who work alot in white pines will know immdeiately what I mean. In an effort to avoid the jangly mess that sometimes ensues with the ascender and biner I've thought that replacing the biner with a twisted clevis would be a clean and simple option. I know there was some discussion if this awhile back, but what was the verdict? Is this safe? As I remember, some folks seemed to think that this would load the clevis in a way it was not specifically designed for. Thanks to anyone who takes the time to respond.

 

[Tom Dunlap]

Good to see another Minnesotan! Welcome Any snow yet?

If you get a twisted clevis just make sure that it's rated for over 5k# breaking strength. If you get one made of stainless steel you can got to [I think] 5/16". This is a great application for the twisted clevis.

I like the stainless clevis' with the countersunk heads. Makes for a nice clean setup. You do need to keep an Allen wrench handy to open it up though.

 

[Norm_Hall]

I use 1 on my Gibbs for the same app.
Like Tom said, make sure it's rated and has a locking "pin".

 

[NickfromWI]

I have a twisted clevis that I used to use. This one is made by Wichard. The pin is a screw pin. I don't know if this makes it more secure, but when you are screwing in the pin in, as you get to that last one or two turns, you feel some reistance like there's a "bump" in the threads. There are two of these bumps and it takes a bit of extra force to get the pin to go past these two bumps. I like that idea. It makes me think that if it takes that much more force to close it, it should take a little more to open it, as well. Meaning that (hopefully) this thing will be a bit less likely to open "by itself."

Norm, is this what you meant by a "locking pin?"

love
nick

 

[taingeil]

Thanks for the speedy replies. Tom, it's been an extremely mild winter, at least in our part of the state. 2 or 3 inches of snow, but drizzle a few days ago have left the gravel roads an absolute terror. We managed to get the chipper truck stuck (for all practical purposes) twice on flat ground. Ever tried digging gravel wearing mukluks?

 

[Leif]

I'm pretty sure I use what you're talking about (twisted clevis) with a micro-cendor. Came that way from sherrill. /forum/images/graemlins/santa.gif

 

[Leif]

Yep, I just checked my sherrill catalog. I use a twisted clevis for Microcendor 5/16" and 6600lb tensile. The one that they have listed for Gibbs is 13/32" and 11465lb tensile, plenty strong enough. /forum/images/graemlins/smile.gif

 

[stevebullman]

i think sherrills is a wichard too. my local chandlery has stacks of wichard clevis's in all shapes and sizes, they're some pretty cool things

 

[Norm_Hall]

Here is a pic of the twisted shackles I use on my "pine flipline" and ART positioner. These are made by Wichard.

 

[Norm_Hall]

Here is a close-up of the shackle. It has 4 notches 180 degrees apart. The pin has a flair at this end that fits into these notches to lock it securely and to prevent from unscrewing. This has been accepted at the ITCC.