Portable catapult device for hurling a succession of balls for batting practice

摘要

Presented is a portable catapult device for hurling a succession of simulated baseballs for the purpose of affording novices in the game of baseball an opportunity to swing at the simulated baseball to thereby increase their proficiency at batting. The device includes a base on which is mounted a carriage that is reciprocable by engagement with an endless chain, and a sling mounted on the base through use of elastic bands selectively connected to and disconnected from one end of the reciprocable carriage so that the elastic bands are stretched a predetermined amount and when released carry a ball-impelling member that engages the ball and impels the ball from the device at a predetermined velocity and in a predetermined trajectory that carries the ball toward the batter.