Heroes often find themselves fighting with objects that aren't intended for use as weapons. Torches, vases, chairs, tankards, bottles, tools, and other mundane items are frequently pressed into service in combat. And sometimes characters find themselves using existing weapons in improvised ways, defending with a ranged weapon in melee or trying to throw a hand weapon not designed to be thrown.
Such improvised weapons cause the wielder to suffer a -1 Fighting or Throwing penalty, as well as -1 to Parry. The Game Master is the final judge of an improvised weapon's effectiveness.
Savage Worlds Deluxe Edition p. 83