Soo.. what would you use this clamp for ? Do you think it was modified ? Or original ?

Speculating here: might it have gone on the flange of an I-beam, as a way to hang something from the beam?

It looks like a beam clamp for attaching a fall arrest system.

autobody "frame dozer" or one of those "crash carts" that I've only seen pics in old ads where one could work on just a door.

I kinda doubt that it's for fall protection, it looks like it's cast iron which I don't think would meet the fall protection requirments in regards to capacity. If I recall correctly, when I retired 10 years ago your tie off points needed to handle 5000 lbs per person,  but that capacity probably varies from state to state and in my case province to province. The bolt and maybe the nut appear to have square heads which leads me to belive that it was made long before fall protection was an issue.
As far as a frame dozer goes, I've never heard that term before but I'll goggle it to see what I can learn about it   

the clamping part looks like it would fit a old car / truck bumper. then the eyelet is for chain, thus could be pulled.

Quote from: gibsontool on June 14, 2018, 09:45:29 PM
If I recall correctly, when I retired 10 years ago your tie off points needed to handle 5000 lbs per person

Yes, that is still the standard.

That's definitely not a beamer, though.

Other than the malleable iron flange ears, it looks a lot like the beam clamps often used for climbing ropes in gymnasiums. http://jammarmfg.com/product/beam-clamp-adjustable-a-312/

5,000 pounds a person?  I know obesity is a growing problem, but still...

Quote from: Bill Houghton on June 15, 2018, 08:49:30 AM
5,000 pounds a person?  I know obesity is a growing problem, but still...

It was explained to me that the 5000 pound # was based on the force of a 200+ pound worker free falling 5-6 feet, and then a safety factor of two applied to that number.  Also that anchor points can be rated for less then 5k if they are part of a fall arrest system with more predictable shock force loads (also with a safety factor of two).

Makes sense that it would be used for a climbing rope, fastened to a bar joist. The flanges on a bar joist are not a thick, or as wide as the flange of an I-beam. We use fall arrest systems at work, and I agree with the 5000 lb. anchor point. Here is a link to an I-beam anchor point for fall arrest.   https://www.globalindustrial.com/p/safety/protection/anchorage-connectors/anchor-beam-sliding-2104700

Regards, Lou

hehehe, guess I proved I'm no climber!

Quote from: MAD on June 15, 2018, 09:25:44 AM

Quote from: Bill Houghton on June 15, 2018, 08:49:30 AM
5,000 pounds a person?  I know obesity is a growing problem, but still...

It was explained to me that the 5000 pound # was based on the force of a 200+ pound worker free falling 5-6 feet, and then a safety factor of two applied to that number.  Also that anchor points can be rated for less then 5k if they are part of a fall arrest system with more predictable shock force loads (also with a safety factor of two).

An interesting demonstration of the laws of physics.

Everything everyone said about fall protection is 100% correct. The 5000 LB figure, and Mad's description of how the figure is arrived at. I also agree with the comment that no way is this a beam clamp. The basic design looks like a modern beam clamp, but as was noted after my comment, it does appear to be cast, and does appear to have square nuts. So ya, it looks like a modern beam clamp for fall arrest but I agree it is not for that purpose. My shoot from the hip observation was wrong, I do agree.

Hello, Bill. I am not sure if the laws of physics apply to fall arrest standards. I think it is more like the manufacturer's, and OSHA's , CYA policy. Regards, Lou