New swivel design?

[crapshoot]

I've had this idea rolling around in my head for a while and wanted to get your collective input. It's basically a mating of the swivel and the ball. I have inverted the U and attached a bolt to the belly/curve. The other option is a triangular form. At the ends would be a through hole and the other would be a threaded hole or use a cotter pin. (Sorry about the bad drawing)

Thoughts?

EDIT: A better image might be this only take out the upper ring and replace it with a post and make the lower portion more rounded or triangular. Obviously the bolt would have to have a flush slot cut into it.

[PIEFURZ]

The second picture does help understanding the idea. I saw things like this at a marina store. I think the spinning part may bind and not turn smoothly unless it has a ball or needle bearing. I did see a couple swivels in a catalog that I think were meant to attach a pulley to, allowing the pulley to turn and take different angles. Store rep thought they only went about 30 deg. Marine supplies hopefully will last a long time and not corrode. I've been thinking of parts like the knuckle joints on automobile drive shafts. A smaller version would be found on front wheel drives. Possible parts for RC cars or ATVs would be small enough. Maybe replacing the two metal links for a ball hook with a piece of parachute cord would work. Just run it thru the strap, pass both ends thru the hole in the ball and knot it on top, will flex in any direction. I read that they used rope some how at one time, maybe just thru a hole in the board.

[crapshoot]

It's hard to see in my pathetic rendering using Paint, but the post would screw into the ball. As for the picture, I wouldn't include the top half, only the bottom half conceptually. Basically, what I am shooting for is a setup with the security of the u-bolt and the removal of one of the joints in the system.

Man, I wish I spent more time with scetchup and could fabricate.

[PIEFURZ]

It's hard to see in my pathetic rendering using Paint, but the post would screw into the ball. As for the picture, I wouldn't include the top half, only the bottom half conceptually. Basically, what I am shooting for is a setup with the security of the u-bolt and the removal of one of the joints in the system.

Man, I wish I spent more time with scetchup and could fabricate.

Thanks for pointing out Scetchup. I noticed your avitar, is that some sort of table top inverted speed bag? I tried an Everlast 4444 ubolt on the top of a TV stand and it did work but is hard to keep going. Look at the attached pic of a bag hanging from a board set vertically. The joint in the swivel lets the bag hit the board at the biggest part of the bag. This should be the sweet spot on the bag where it will produce the best rebound. Eliminating this joint may mean that your ubolt pin may have to be at this distance to hit the sweet spot. Having the bag strap on the pin would make it like a chain link swivel which needs the upper joint to go side to side. Just some food for thought. Keep the creative juices flowing. You may find something at a hardware or boating supply store that you could modify without having to totally fabricate. I picked up a 1/4" turnbuckle with small eye holes and an 8" eye bolt with a long part not threaded thinking I could rebuild a worn out metal swivel and the 1/4" thread from the turnbuckle is loose in the metal ball. The eye hole on the 8" is bigger than the turnbuckle making for extra length in the chain. May try the next size up turnbuckle and file it down if necessary. Good luck and keep posting your progress.