I ran across these clamps at the Goodwill Clearance Center. Cannot find any information on them. Any ideas on what they are supposed to clamp?

Why are they grooved, why do they swivel, and why is there no pad on the end of the screw?

Beats me.

          ;-)

Studied these a bit,  am thinking for clamping something to tubing or pipe.   The bottom swivels so as to fit more compactly into a case, seen something like these long ago.  When?????

Possibly a overhead leveling clamp for holding black iron or galvanized pipe--the flat groved part fits into a sheet metal clamp that gets anchored into a concrete ceiling with powder actuated loads or anchorments via hammerdrill.   the screw levels the pipe in a horizontial fashion or gives it pitch for drainage or other applications...MY WAG

Not a pipe hanger, nothing like it in any of the old catalogs. 

A lot of hangers,  in the day, were simply bent rod.

Chilly