The operative phrase in the second subsection of the New York Penal law prohibiting "dangerous kni(ves)" is the "intent to use the same unlawfully against another". So if you threaten somebody with the knife, then any knife is illegal.
But what you may also need to worry about is the first subsection in the statute that prohibits gravity knives. New York defines gravity knife as:
"any knife which has a blade which is released from the handle or sheath thereof by the force of gravity or the application of centrifugal force which, when released, is locked in place by means of a button, spring, lever or other device." New York Penal Law 265.00(5).
Any locking and folding pocket knife that you can flick the blade out to the open position is a gravity knife. I have personally seen a lot of inexpensive and expensive knives perform in this manner. I am also an attorney the represents a number of people accused of this crime.
Good Luck.

