Dynamic damper and dynamic damper-installed tennis racket
AssigneeSumitomo Rubber Industries, Ltd.
InventorYumi Kanemitsu
Life of this patent
Estimating the term…
Abstract
A dynamic damper (10) having a viscoelastic part (12) and a mass-adding part (11) laminated on the viscoelastic part (12). The dynamic damper (10) has a horizontal frame (13) and a vertical frame (14) disposed at both sides of the horizontal frame (13) in such a way that the horizontal frame (13) and the vertical frame (14) continuous with the horizontal frame (13) in the shape of a lattice. The horizontal frame (13) and the vertical frame (14) are integral with each other or separately provided in the shape of a lattice.
Claims19
A dynamic damper which comprises a viscoelastic part and a mass-adding part laminated on said viscoelastic part and is installed on a racket,
- said dynamic damper having a horizontal frame and a vertical frame disposed at both sides of said horizontal frame in the shape of a lattice,
- wherein said horizontal frame and said vertical frame are integrally formed or formed by joining separate members with each other, said horizontal frame is installed on at least one surface of said racket in a thickness direction thereof, and said vertical frame is installed on both surfaces of said racket in a widthwise direction thereof;
- and
- wherein said horizontal frame is bent in a shape of a letter “U”;
- one end of a bent portion disposed at both sides of said horizontal frame is integral with said vertical frame or joined therewith;
- said bent portion disposed at both sides of said horizontal frame is installed on both surfaces of said racket in a widthwise direction thereof and the number of said horizontal frames is not less than two.
A tennis racket comprising a part surrounding a racket frame face with insertion holes, a throat part, a handle, and a dynamic damper installed on at least one portion of the part surrounding the face of the racket frame or/and at least one portion of the throat part of said tennis racket,
- wherein said dynamic damper has a viscoelastic part and a mass-adding part laminated on each other and is installed on at least one surface of said racket frame in a thickness direction thereof and both surfaces of said racket frame in a widthwise direction thereof;
- and
- said dynamic damper installed on said racket frame allows for an out-of-plane 2nd damping factor of said racket frame and an in-plane 3rd damping factor of said racket frame to be not less than 1%.
Dependencies are inferred from the claim text.