Bullring rigging device idea

Much like a porty I believe, with the bollard or ring or both against the tree stem.
 
It might be an improvement if the ring gives a little more 'breathing room' to the rope, from an odd-shaped trunk. Otherwise, it seems like its a bulkier POW.
 
Because of the symmetrical design of the Bullring, it offers an interesting capability of running the rope through the ring and 1/2 turn around the bollard, then through the ring and once around the middle part of the bollard, then a 1/2 wrap around the bollard on the opposite side , and back through the ring . Additional wraps then are easily added to either or both sides if needed. Perhaps this would be useful to rig a load down with either end of the same line.
 
I just bought a totem crt. For top rigging, I use mostly the stitch plate function, but it’s multipurpose and can be used the the “tree angel”
While I like your design and hope it would be smaller in size it pretty much has one purpose.
I don’t see the application for having two bollards, as one lowering line is alreadypushing the limits for a climber to control.

The guy I use to work for fabed up a bollard that looked like a cross. Equidistant pipe, opposite sides had cleats and the other two had large rings. It was primarily used off the k-boom crane he had. It was great, with some outside the box uses.
 
The cross device sounds like an interesting design, simple and elegant.

I have redesigned the ring smaller, with a 5" ID, and a 2.5" OD bollard. If I were to produce a few then I would have the ring and cross member CNC machined from a solid billet, with a nice smooth radius as shown. and add the bollard and staysimg013.jpgimg014.webp
 
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I like it. A one way ratcheting bollard! (pretty steep request, I know)

Ponder making it with one bollard, and then on the opposing side come out about 2" and cap it with a nice smooth radius. the nubbin will help hold it out from the trunk and keep the rope from pinching or avoiding thrashing the bark on non removals. I'd also consider making a smaller eye on the top of the ring for attachment, kind like a disproportioned fig 8.

If you go crazy with it, mimic a dmm rigging ring. it could be used as a floating lowering point.
 
But, arc would be required for 1/2” thickness, TIG would be fine for 3/16” and thinner. So, never mind. 6061 T6 would be plenty strong.
 
I think also that the 1" thick ring in 6061would suffice. I think also it would need four stays rather than 2, which would allow for some interesting rope configurations through the device.
 
Whoopie or dead eye might be better and easier the keep centered. Personally I would want to keep it on a sling and forgo the having to reset it every time with a loopie, perhaps splice it in to a loopie. Or is a loogie strap something new.
 
If the bollard diameter is 2.5" OD, the ring could be close to 3.5-4" ID; the rest is wasted space, and more material/ weight and bulk.

Post 27 You mention 5" ID.
Post 36 You mention 7" OD.

Smaller and lighter is the market I see, 1/2" rope capacity. Maybe a second size for heavier rigging.
 
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