Amusement devices: games – Aerial projectile game; game element or accessory therefor... – Target
Patent
1977-06-03
1979-05-08
Apley, Richard J.
Amusement devices: games
Aerial projectile game; game element or accessory therefor...
Target
273 75, A63B 4904
Patent
active
041532490
ABSTRACT:
A standard size tennis racket has a flex of substantially 1.2 centimeters at the throat, 2.4 centimeters at the head center and 5.8 centimeters at the tip when a force of substantially thirty pounds is applied to the racket tip with the racket cantilevered from the handle end. A weight between 15 and 25 grams is located on one side on the frame at the midpoint of the strings, and a weight of between 15 and 25 grams is placed at the end of the handle, the weights being concentrated in as small an area as possible, the total weight of the racket counting the side weight only being substantially the same as a conventional unweighted racket. For a 27 inch racket, the weights are selected to establish a center of gravity between 123/4 inches and 13 inches from the end of the handle and the center of percussion between 22 and 221/2 inches from the end of the handle determined by using a pivot point 43/4 inches from the end of the handle. The side weight is preferably as close to the heavy end of the range as possible without having the center of gravity move above 13 inches, and the end weight is selected not only to keep the center of gravity below 13 inches, but to maintain the center of percussion within the stated range. Preferably, the grip on the handle allows the player to hold the racket in the correct portion with the side weight up without looking at the racket, being flat on the thumb side with a bulge to fill the palm 21/4 inches up from the end and a rounded area 41/4 inches up on the palm side.
REFERENCES:
patent: 1539019 (1925-05-01), Nikonow
patent: 2164631 (1939-07-01), Abell
patent: 2395864 (1946-03-01), Geerlings et al.
patent: 3568290 (1971-03-01), Carlton
patent: 3801099 (1974-04-01), Lair
patent: 3833219 (1974-09-01), Dean
patent: 3913911 (1975-10-01), Peterson
patent: 4058312 (1977-11-01), Stuff et al.
Apley Richard J.
Hieken Charles
Motion Analysis Inc.
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