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    • 6. 发明授权
    • Damped tennis practice device
    • 阻尼网球练习装置
    • US4989867A
    • 1991-02-05
    • US348604
    • 1989-05-18
    • Robert M. Herrick
    • Robert M. Herrick
    • A63B69/00A63B69/38
    • A63B69/0091A63B69/38
    • A transportable, damped tennis practice device (10) is provided for the solitary practice of tennis strokes every two to three seconds. The device (10 ) preferably includes a base (12), a ball (16), wand structure (14) for mounting the ball (16) on one end thereof, connecting assembly (18) for attaching the other end of wand structure (14) to the base (12). The wand structure (14) is flexibly, resiliently formed in a predetermined, arcuate shape. The device (10) stands in a ready position until ball (16) is struck by a practitioner at which time the ball (16) and wand structure (14) begin to oscillate pivotally on the base (12), while the wand structure (14) also flexes to shapes other than the predetermined shape. The damping apparatus (20) includes a rod-like member (114) which indirectly acts on the connecting assembly (18) to damp the oscillatory motion. In an alternative embodiment, the elevation of ball (16) is effectively raised by insertion of extension rod (120) between arm (90) and connection block (98).
    • 每隔2-3秒,提供一种可移动,阻尼的网球练习装置(10),用于单打网球练习。 装置(10)优选地包括底座(12),球(16),用于在其一端安装球(16)的杆结构(14),连接组件(18),用于附接球杆结构的另一端 14)到基座(12)。 棒状结构(14)以预定的弓形形状弹性地形成。 装置(10)处于就绪位置,直到球(16)被执业者击打,此时球(16)和杆结构(14)开始在基座(12)上枢转地摆动,而杆(1) 14)也弯曲成除了预定形状之外的形状。 阻尼装置(20)包括间接地作用在连接组件(18)上以阻尼振荡运动的杆状构件(114)。 在替代实施例中,通过在臂(90)和连接块(98)之间插入延伸杆(120)来有效地提高球(16)的高度。
    • 7. 发明授权
    • Tennis practice device
    • 网球练习器
    • US4531734A
    • 1985-07-30
    • US636109
    • 1984-07-30
    • Robert M. Herrick
    • Robert M. Herrick
    • A63B69/00A63B61/00
    • A63B69/0091
    • A tennis practice device for indoor use has a swingable upright arm pivotally connected to a weighted base. A tennis ball is connected to the top of the arm, and movement of the arm is limited and dampened by two cushions. An elastic strap normally holds the arm against one of the cushions. In the arm, an elongated wire with a spring trunk is surrounded by lengths of tubing arranged in telescopic fashion. The arm is resilient and capable of whip-like movement, rendering the impact resistance presented by the ball against a racquet similar to the resistance of a ball in actual play. Simultaneously, the combination of the pivot means with the resilient nature of the arm permits the ball to escape the follow-through stroke of the racquet, yet quickly return to its normal position to allow the tennis player to repeat strokes in rapid succession.
    • 用于室内的网球练习装置具有可枢转地连接到加权基座的可摆动的直立臂。 网球连接到手臂的顶部,手臂的运动受到两个垫子的限制和阻尼。 弹性带通常将臂支撑在其中一个垫子上。 在手臂中,带有弹簧箱的细长线被可伸缩方式布置的长度的管道包围。 手臂具有弹性,能够进行鞭状运动,使得球体抵抗球拍所产生的抗冲击性能与实际发挥的球的阻力相似。 同时,枢转装置与手臂的弹性特性的组合允许球逃离球拍的跟随冲程,但是迅速地返回到其正常位置,以允许网球运动员快速连续地重复冲程。