Ball dispensing apparatus for hitting practice includes a ball retainer for retaining and sequentially delivering balls to one end thereof, a lever rotatably mounted on a shaft at the one end of the retainer for engaging and lifting a ball from the retainer upon rotation of the lever, and an actuator...http://www.google.es/patents/US4676504?utm_source=gb-gplus-sharePatente US4676504 - Tennis and baseball dispensing apparatus
