Patent ID: 7100594

Claim:
An apparatus for propelling balls for game practice comprising: a base member contacting a fixed support member having an integral vertically extending member, the vertically extending member terminating in a first dual hinge; a lifting arm, including an upper elongate member having a first end and a second end and a lower elongate member having a first end and a second end, the upper elongate member attached to the first dual hinge at a first end and the lower elongate member rotatably attached to the first dual hinge at a first end, the upper elongate member and the lower elongate member mounted substantially parallel to each other; a compression resistant member having a first end and a second end, the first end attached to the base member and the second end attached to the lower member of the lifting arm; a movable vertically extending member having a second dual hinge, the second dual hinge rotatably attached to the second end of the upper elongate member and rotatably attached to the second end of the lower elongate member, such that the upper elongate member, the lower elongate member, the first dual hinge and the second dual hinge form a deformable parallelogram that maintains the orientation of the movable vertically extending member relative to the base member; an oscillating bracket rotatable about the vertical axis attached to the movable vertically extending member; a ball propulsion device supported by and rotatable about a horizontal axis attached to a serving head support bracket; and a ball delivery guide feeding balls to the ball propulsion device mounted on the serving head support bracket.