| 摘要 |
<p>The apparatus for teaching the serve in tennis consists of the base plate (1), where is placed the main pole and its hydraulic system (2), which is reinforced by the supporting poles (3) and hydraulic pump (6) with the oil tank (7) and the cable container (24a), where is stored a surplus of the feed cable (25), which feeds the distribution box (24) and the electromotor (9); to the supporting poles (3) is mounted the service plaform (5), and horizontal ribs (4a) form the accessible ladder (4) to the service platform (5); on top of the inner movable pole of the main pole and its hydraulic system (2) are attached to the connecting flange: the electromotor (9) with the rotor (10), the balance weight (29), the ball container (11), and delivery arm (12), which ends with the ball feed opening (13); and in a space of the ball feed opening (13) is located the ball target (14), where is situated the ball target indicator (17) and radar (16); under the ball feed opening (13) hanging from the rope (30) is the ball suspender (15) for the ball (31), whereby on the delivery arm (12) above the ball feed opening (13) is attached the deflector bar (23), where are located the deflector plates (22) and parallel on the opposite side is the indicator bar (19), where are located the movable ball toss indicator (20) and ball hitting indicator (21), and the indicator bar (19) is attached on the bottom side of the supporting plate (18) of the delivery arm (12); the electronic evaluation system and computer control are mounted between supporting poles (3), which form the computer (26), the control panel (27) and display screen (28).</p> |
