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1. 发明授权

US4026551A Baseball pitcher's practice target 失效
标题翻译：棒球投手{3 s练习目标
公开(公告)号：US4026551A
公开(公告)日：1977-05-31
申请号：US675527
申请日：1976-04-09
申请人： Charles W. Larson
发明人： Charles W. Larson
IPC分类号： A63B69/00 , A63B69/40
CPC分类号： A63B69/0097 , A63B69/0053
摘要： A baseball pitcher's target includes a rebound wall surface which is divided into an upper half section and a lower half section. Each of the half sections is tapered rearwardly from the horizontal mid-point of the wall surface. The upper half section thus imparts an upwardly directed force component to a ball which strikes it whereas the lower half section imparts a downwardly directed force component to a ball which impinges upon such surface. Additional elements are secured to both the upper and lower half sections to impart laterally directed force components to a ball which strikes them and arcuately contoured elements are secured to both of the half sections, the arcuately contoured elements secured to the lower half section imparting a downwardly directed force component to a ball which strikes them whereas the arcuately contoured elements secured to the upper half section impart an upwardly directed force component to a ball which strikes them. Marginal side portions of the wall surface are tapered rearwardly.
摘要翻译：棒球投手的目标包括分为上半部分和下半部分的回弹壁面。每个半部分从壁面的水平中点向后渐缩。因此，上半部分将向上的力分量施加到撞击其的球，而下半部将向下的力分量赋予撞击在该表面上的球。附加元件被固定到上半部分和下半部分上，以将横向定向的力分量施加到撞击它们的球上，并且弓形轮廓元件固定到两个半部分上，固定到下半部分的弓形轮廓元件向下定向力分量撞击到它们的球，而固定到上半部分的弧形轮廓元件将向上的力分量赋予击打它们的球。壁面的边缘侧部向后倾斜。

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