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    • 65. 发明授权
    • Tennis racket
    • 网球拍
    • US4141549A
    • 1979-02-27
    • US798362
    • 1977-05-19
    • Thomas J. HayesWilliam M. Reed
    • Thomas J. HayesWilliam M. Reed
    • A63B51/06A63B69/38
    • A63B51/06
    • A tennis racket has a frame member forming a head portion having duplicate strung ball striking matrices, each matrix being substantially coplanar with a respective front and rear face of the frame member. The matrices are formed with a plurality of intersecting string lengths, each being threaded through an aperture extending between the front and rear face of the frame member. In an alternate embodiment each string length traverses a respective front or rear face and then is passed through a radially directed aperture connecting an outer margin of the frame with an inner margin. A signal device is attachable to the matrices for emitting an audible response upon ball impact within a prescribed locus on the matrix.
    • 网球拍具有形成具有重复的串珠打击矩阵的头部的框架构件,每个矩阵与框架构件的相应的前后面基本共面。 矩阵形成有多个相交的串长度,每个长度均穿过在框架构件的前后表面之间延伸的孔。 在替代实施例中,每个绳长度穿过相应的前表面或后表面,然后穿过将框架的外边缘与内边缘连接的径向定向孔。 信号装置可附接到矩阵,用于在矩阵中的规定轨迹内的球撞击时发出可听见的响应。