Bridge Week Riddle #3 (Wed. 3/7)

I am strong from the top,

So rigid, so strong…I won’t flop.

Made for those heavy “choo-choos”,

With three-sided friends, too.

The more friends the better,

Some types feature that “K” letter.

Patented by a guy named Howe…

Thinking about the orioles now.

You’ll figure me out, that I trust,

So please stop all this bridge fuss!