Improvements in the construction of tennis ball launching machines. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in the construction of tennis ball throwing machines, comprising a frame structure having an upper portion and a lower portion, a feeding hopper mounted on the upper portion of said frame structure, a launcher arm means constructed on an elongated shaft rotatably mounted on said frame structure and adapted to receive and propel a tennis ball, a means for feeding the balls interconnecting said feed hopper and said launching arm means, a tensioned triangle pivotably mounted on said frame and joined with said frame structure, a means interconnecting said triangle and said launching arm, and said frame being constructed and arranged to maintain said triangle tensioned under spring-loaded tension, a motor cooperating in drag relation with said arm means launcher to print a rotary motion force to said launcher arm means, a throwing hand built on an elongated shaft fixed with said throwing arm means, said hand being provided for receiving a tennis ball, a spring adjusting arm pivotably connected at one of its ends with said frame structure, said arm having means attached thereto for modifying the spring loaded tension applied to the launching arm to launch a projectile, and a means disposed on said frame having a plurality of adjustment arm stops for receiving and retaining a free end of said spring adjustment arm. (Machine-translation by Google Translate, not legally binding)