公开(公告)号：US5386988A

公开(公告)日：1995-02-07

申请号：US70886

申请日：1993-06-03

申请人： Lan C. Sung ,  Chin M. Huang ,  Lan K. Sung

发明人： Lan C. Sung ,  Chin M. Huang ,  Lan K. Sung

IPC分类号： A63B69/00 ,  A63B69/38

CPC分类号： A63B69/0079 ,  A63B69/0091 ,  A63B69/38

摘要： A tennis practicing device includes a foldable base frame assembly, a tube pivotally mounted on the base frame assembly, and a ball returning assembly mounted in the tube. The ball returning assembly includes a tubular member consisting of an upper elastomeric section and a lower rigid section, a spring position in the tubular member, and a connecting member. A tennis ball is pre-drilled in its diameter before it is mounted to the ball returning assembly. The connecting member passes through the holes of the ball until an enlarged head end of the member grips the surface of the ball. A first end of the spring is attached to a tail end of the connecting member and the second end of the spring is attached to the lower end of the lower rigid section. The tube has a engaging means, in the form of a knob in an upper portion of the tube to clamp releasably the ball returning means.

摘要翻译： 网球练习装置包括可折叠底架组件，可枢转地安装在基架组件上的管和安装在管中的球返回组件。 球返回组件包括由上弹性体部分和下部刚性部分组成的管状部件，管状部件中的弹簧位置和连接部件。 在安装到球返回组件之前，网球预先在其直径上预钻。 连接构件穿过球的孔，直到构件的扩大头端夹住球的表面。 弹簧的第一端附接到连接构件的尾端，并且弹簧的第二端附接到下部刚性部分的下端。 管具有在管的上部中的旋钮形式的接合装置，以可释放地夹紧球返回装置。

公开(公告)号：US4699378A

公开(公告)日：1987-10-13

申请号：US884032

申请日：1986-07-10

申请人： Lan C. Sung

发明人： Lan C. Sung

IPC分类号： A63B69/40

CPC分类号： A63B69/408

摘要： A tennis ball throwing machine which comprises a motor secured to a frame board, the output end of the motor shaft having a gear wheel securely mounted thereon, first and second transmission shaft respectively fixed to a gear wheel at one end thereof and engaged with the gear wheel of the motor, a bat pivotally attached to the first transmission shaft, one end of the bat being a hitting portion, and the other end thereof being attached to a tension spring, a cam pivoted on the second transmission shaft, a ball guiding groove being pivoted on a supporting shaft and having a portion thereof in contact with the cam to move upward, downward, leftward and rightward, a tension spring at the bottom end of the ball guide groove. The axis of the cam which is eccentric with and at an angle relative to the second transmission shaft, and two guiding boards are provided beneath the ball guiding groove, the two guiding boards being clamped on both sides of the cam whereby the ball guiding groove driven by the cam may move upward, downward, leftward and rightward to change the throwing direction.

摘要翻译： 一种网球投掷机，其特征在于，包括固定在框架板上的马达，马达轴的输出端具有安装在其上的齿轮，第一和第二传动轴分别固定在齿轮的一端并啮合齿轮 电动机的转轮，以第一传动轴为枢轴转动的蝙蝠，蝙蝠的一端为撞击部，另一端安装在拉伸弹簧上，枢转于第二传动轴上的凸轮，球引导槽 在支撑轴上枢转，并且其一部分与凸轮接触以向上，向下，向左和向右移动，在球引导槽的底端处具有拉伸弹簧。 相对于第二传动轴偏心并相对于第二传动轴的凸轮的轴线和两个引导板设置在球引导槽的下方，两个引导板被夹紧在凸轮的两侧，由此滚珠引导槽驱动 通过凸轮可以向上，向下，向左和向右移动以改变投掷方向。