Unusual Vintage Bar Clamp For Round Column or Pipe?

Specifications

Unusual Vintage Bar Clamp For Round Column or Pipe? I'd guess this is for some special trade or industry use. Maybe for large iron pipes or wooden columns? Steamfitters clamp? I've been repairing houses and furniture for 40 years and never had a situation where I can imagine using this bar clamp. The lower jaw has a 5 1/2" diameter and the upper jaw is approx. 3 1/2" diameter. The lower jaw seems to be wedged in place by something that looks like a screwdriver. the span for the 2 jaws is from 35 3/4" at it's widest position to 20 1/4" at its narrowest. The bar itself, not counting the crank and thread is approx. 41 1/2" long It weighs 19 lb.

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