Spring clamping sheet catapult

The utility model discloses a spring clamping sheet catapult, including handle, latch segment, sight, locking knob, spring, rubber band, locating piece, U type support, spout, handle one side is equipped with U type support, be equipped with the rubber band between the both ends of U type support, the both ends of U type support are equipped with the latch segment that is used for pressing from both sides tight rubber band, U type support both ends are equipped with the locking knob respectively, the locking knob is continuous with the latch segment, and rotate the locking knob and can closelylaminate latch segment and U type support together, the the threaded portion of locking knob is equipped with the spring, the spring mounting is in the inside of U type support, it is tight that theknob top will be locked to the spring, and it is rotatory by oneself to prevent to lock the knob, leads to the latch segment to drop, U type support both ends are equipped with the spout respectively,install on the spout and b