[mikeleung]

"Under Penal Law 265.01, a gravity knife is defined as any knife that opens with “the force of gravity or the application of centrifugal force” and has a blade that locks into place by means of a “button, spring, lever, or other device.”

Courts have interpreted that to mean that any knife that can be opened with a “wrist flick” — a movement something like what a fan dancer might do — qualifies as a gravity knife. A long list of court cases have turned on exactly that question, which seems straightforward enough."

I think spring assisted folding knives do meet this definition, and the article also does mention many folding knives sold in the city also meet this definition