bt,
Just changing the material it is made out of will still be in breach of the patent as a patent is granted on the “way” something works, not what it looks like.
A good patent application will not include any diagrams of the apparatus that is being patented such that there may be more than one way for the apparatus to be built as described in the patent specification that was not originally conceived by the inventor, but works on the same principle as the invention. In this way, the inventor affords himself or herself greater protection under the patent than would otherwise be possible with a patent specification which includes a diagram.
For example, if Bib got himself a good patent attorney than the specification would have said something like it is tightened down by way of threaded rods and that automatically protects Bigger against any other hanger that uses some kind of thread device (screw, bolt, whatever) to tighten down ensuring his is the only one with that feature.He could have said that it is shaped in two halfs and internally it has ribs.
Bingo, anything even remotely like a Bib is finished.