发明名称 Rotational Mechanics Swing Aid Device
摘要 A batting swing aid for batting practice is provided having an arm encircling strap engaged to a planar base. The base is held against the torso of a user and provides a mount for the strap to hold an encircled arm of the user adjacent to the user's torso during a swing of the bat. The attachment of the base to the strap may be elastic to allow for movement of the arm away from the torso during a swing, or may be detachable and make an audible noise to signal deviation from optimal body positioning during a swing.
申请公布号 US2013324331(A1) 申请公布日期 2013.12.05
申请号 US201313904888 申请日期 2013.05.29
申请人 BARNHILL JON 发明人 BARNHILL JON
分类号 A63B69/00 主分类号 A63B69/00
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