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    Racquet stringing machine
    3.
    发明授权
    Racquet stringing machine 失效
    球拍打弦机

    公开(公告)号：US5568921A

    公开(公告)日：1996-10-29

    申请号：US142687

    申请日：1993-10-26

    申请人： John F. Lorentzen ,  Todd B. Colburn ,  Ray Mortvedt

    发明人： John F. Lorentzen ,  Todd B. Colburn ,  Ray Mortvedt

    IPC分类号： A63B51/14

    CPC分类号： A63B51/14

    摘要： An improved racquet stringing machine having a new table featuring a built-in glide bar groove, an improved string clamp, a new tip riser having integrated, threaded height adjustment, an adjustable throat riser carried by an internal sliding bar having improved position lock, and machine height adjustment by a foot operated mechanism.

    摘要翻译： 一种改进的球拍穿线机具有新的桌子，其具有内置的滑动条槽，改进的线夹，具有集成的螺纹高度调节的新的尖端提升器，由具有改进的位置锁定的内部滑动杆承载的可调喉管提升器，以及 机器高度由脚踏操作机构调节。

    Racquetball racquet having increased stiffness at tip
    4.
    发明授权
    Racquetball racquet having increased stiffness at tip 失效
    壁球球拍在尖端具有增加的刚度

    公开(公告)号：US5470061A

    公开(公告)日：1995-11-28

    申请号：US267448

    申请日：1994-06-28

    申请人： Todd B. Colburn ,  John F. Lorentzen

    发明人： Todd B. Colburn ,  John F. Lorentzen

    IPC分类号： A63B49/02

    CPC分类号： A63B49/02 ,  A63B2049/0203 ,  A63B2049/0204 ,  A63B2049/0207 ,  A63B2049/0211 ,  A63B2049/0212

    摘要： Racquetball racquet having a frame forming a head and a handle characterized by a side profile comprising two intersecting arcs having different radii of curvature and intersecting at a point of intersection which is in the region of but above the throat of the racquet. These two arcs define two oppositely tapered frame segments. The first frame segment extends from the tip of the racquet, where the frame height is at a maximum, to the point of intersection, where the frame height is at a minimum. The second frame segment extends from the handle, at or below the throat, to the point of intersection. The arc defining the first segment is of much larger radius of curvature than the arc defining the second segment. This affords a maximum frame cross-sectional area at the tip and a smaller frame cross-sectional area in a flex zone which includes the point of intersection. The resulting racquet has a greater stiffness moment at the tip and a smaller stiffness in the flex zone which may afford more power and greater control.

    摘要翻译： 具有形成头部的框架和手柄的壁球球拍，其特征在于侧面轮廓包括具有不同曲率半径的两个相交的弧线，并且在与球拍的喉部之间的交叉点相交。 这两个弧定义两个相对锥形的框架段。 第一框架段从框架高度最大的球拍尖端延伸到帧高度最小的交点。 第二框架段从手柄处，在喉部处或下方延伸到交叉点。 限定第一段的电弧比限定第二段的电弧的曲率半径大得多。 这提供了尖端处的最大框架横截面面积和包括交点的柔性区域中较小的框架横截面积。 所得到的球拍在尖端处具有更大的刚度并且在柔性区域中具有较小的刚度，其可以提供更多的功率和更大的控制。