Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1988-06-10
1990-04-24
Coven, Edward M.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 73G, A63B 4902
Patent
active
049194380
ABSTRACT:
In a tennis racket having a frame portion and a shaft portion formed integrally with the frame portion of a fiber-reinforced plastic, the shaft portion has in a direction perpendicular to a striking area a minimum thickness (T2) at a longitudinally intermediate part thereof, the minimum thickness (T2) being between 60% and 80% of the thickness (T1) at the lower end of the shaft portion, while the frame portion has in the same direction a maximum thickness (T3) at the side portions thereof corresponding to a striking sweet spot and a minimum thickness (T4) at the top thereof, the maximum thickness (T3) being between 110% and 140% of the thickness (T1) and being between 135% and 160% of the minimum thickness (T4), whereby a time elapsed until the shaft portion reaches an initial maximum amplitude value when vibrating in the ball striking direction at an impact of a ball is approximated to a time elapsed until the side portions of the frame portion reach an initial maximum amplitude value when vibrating toward the center of the striking area at the impact.
REFERENCES:
patent: 3647211 (1972-03-01), Doessel
patent: 3809402 (1974-05-01), Haines
patent: 4177990 (1979-12-01), Kajiwara
patent: 4565371 (1986-01-01), Pawlicki
patent: 4664380 (1987-05-01), Keubler
Coven Edward M.
Stoll William E.
Yonex Kabushiki Kaisha
LandOfFree
Tennis racket does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Tennis racket, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tennis racket will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-29885