Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1992-12-10
1995-05-23
Chiu, Raleigh W.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 73R, 273 73C, A63B 4902
Patent
active
054174180
ABSTRACT:
A monoshaft tennis racquet has a frame head that circumscribes a stringing area, and a shaft connected to the opposite ends of the head. Either the head or the shaft, and preferably both, are formed of a composite material. The racquet preferably has a head having a length of at least 12 inches, a maximum width of at least 9 inches, and a strung surface area of at least 90 square inches. Preferably also, the free space vibrational frequency perpendicular to the stringing plane is matched to the in-plane vibration frequency so as to provide a unique and desirable feel in the racquet. Preferably, the vibration frequency perpendicular to the stringing plane is within 10% of the in-plane vibration frequency, and most preferably within 5%.
REFERENCES:
patent: Re31419 (1983-10-01), Frolow
patent: 3999756 (1976-12-01), Head
patent: 4007929 (1977-02-01), Figa
patent: 4052060 (1977-10-01), Balkcom
patent: 4575084 (1986-03-01), Yoneyama
patent: 4664380 (1987-05-01), Kuebler
patent: 4989871 (1991-02-01), Sheng
patent: 5006298 (1991-04-01), Tsai
patent: 5037098 (1991-08-01), Davis
patent: 5071124 (1991-12-01), Davis
patent: 5219166 (1993-06-01), Chang
patent: 5238247 (1993-08-01), Davis
Photocopy and side-view drawing, Volkl Soft Tennis Racket, 1981.
Tennis Magazine, Jul. 1980, Fischer Superform Mid tennis racquet.
Kuebler, "Zwangzig Jahre Tennisschlager", 1992, pp. 38-40, 42-43, 45-53, 55-57.
Davis Stephen J.
Terzaghi Andre
Chiu Raleigh W.
Prince Manufacturing, Inc.
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