Addendum to my previous post because i missed it, i dont recall the Sai or Jutte being called sword breakers.
Thats a sword breaker. (for anyone who doesnt know what a sword breaker is and sees this thread)
Your example, as well as this:
and the sai and jutte were all called sword breakers.
None of them were really likely to break a sword. I've tried.
What they are effective for, is trapping the sword and breaking the attack/defense of your opponent. It's somewhat difficult to strike/block/parry if your sword is held in place for even a fraction of a second.