Racket having thickened shaft portion
OwnerSiegfried Kueblerinventor
Life of this patent
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Abstract
A racket for playing a game using a ball of limited resiliency such as a tennis racket comprises a racket head frame portion provided with stringing, a handle, and a shaft arrangement connecting the racket head frame portion and the handle. The resonance frequency of the racket head frame portion at least approximately corresponds to the period of time for which a ball is in contact with the strings of the racket when struck thereby, and the natural frequency of the racket substantially corresponds to the excitation frequency of the ball. The thickness of the racket frame as measured in a direction normal to the plane of the stringing is greater than the thickness of the handle as measured in a corresponding direction.
Claims16
A tennis racket for use with a tennis ball having a longitudinal axis which comprises a handle, a frame portion defined by a frame member having an annular opening, stringing on said frame member covering said annular opening, shaft members depending from the frame member and including a transition from the shaft members to the handle, a throat member extending between the shaft members and forming a base of the frame portion, said throat member and said shaft members defining a throat region, said handle being connected to the shaft members in the longitudinal axis of the racket forming a straight line of symmetry, wherein the cross-sectional height of said shaft members as measured in a direction perpendicular to the plane of the stringing is greater than the parallel thickness of each of the frame member and handle, and wherein the resonance frequency of said frame portion at least approximately corresponds to the period of time for which a standard new tennis ball is in contact with the stringing.
Dependencies are inferred from the claim text.