Switch-bladed

The symbol may be expressed antisocially by carrying a liquor flask, a switch-bladed knife, or a zip gun.

Source: wiktionary

Graham Crowden as Smythe, gang-killer with stiff upper lip and switch-bladed umbrella;

Source: wiktionary

'Sweet enough for my strong teeth,' he rejoined, and taking a switch-bladed knife from his pocket he approached the peach espalier and cut from it several of the luscious-looking fruits.

Source: wiktionary

I slipped Ike's switch-bladed scaling knife from my bra and lunged.

Source: wiktionary