Are sword canes legal to carry in Pa?

No, not in my experience. They are considered to be "concealed weapons" and are unlawful to carry in public.

Additional comment: Some may argue that "carrying" a sWord cane is NOT illegal unless/until you draw it out to use it, but that argument holds no truth and misses the entire point. Under THAT reasoning it would not be unlawful to carry a gun without a permit either, UNTIL such time as you draw it out to use it.

The law does not play that game. If it's a concealed weapon = it's unlawful to carry in public.