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US4153249A Expired / Lapsed US ⏱️ 0.0 years remaining

Bioengineered game racket

Assignee: MOTION ANALYSIS Inc
•
Filing: 1977-06-03
•
Granted: 1979-05-08
•
Expires: 1997-06-03
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Abstract

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.

Inventors

  • 👤 Stanley C. Plagenhoef

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 14:44
CPC Classifications
A; A63; A63B; A63B60/00; A63B60/02; A63B49/00; A63B49/02; A63B49/08; A63B60/06; A63B60/10; A63B60/12; A63B60/08

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 161 words
In a game racket having at least a head portion with a top, bottom and two sides and a handle portion the improvement comprising, side weight means located at one side only of the head portion for reducing the strain on the anatomy of the arm when a player makes an off-center hit with the side weight means up when the hit occurs, and handle weight means located in said handle portion and coacting with said side weight means for establishing the center of gravity of said game racket at a point closer to the end of the handle portion than to the tip of the head portion and a center of percussion relative to a center of rotation in said handle portion located between the tip of the head portion and the midline of the head portion for reducing the strain on the anatomy of the arm when an off-center hit occurs on the tip side of the head midline.
Claim 2
Dependent Claim 161 words
In a game racket having at least a head portion with a top, bottom and two sides and a handle portion the improvement comprising, side weight means located at one side only of the head portion for reducing the strain on the anatomy of the arm when a player makes an off-center hit with the side weight means up when the hit occurs, and handle weight means located in said handle portion and coacting with said side weight means for establishing the center of gravity of said game racket at a point closer to the end of the handle portion than to the tip of the head portion and a center of percussion relative to a center of rotation in said handle portion located between the tip of the head portion and the midline of the head portion for reducing the strain on the anatomy of the arm when an off-center hit occurs on the tip side of the head midline.
Claim 3
Dependent Claim 16 words
The improvement in accordance with claim 1 wherein said side weight means embraces the head midline.
Claim 4
Dependent Claim 21 words
The improvement in accordance with claim 2 wherein said handle weight means is located at the end of said handle portion.
Claim 5
Dependent Claim 43 words
The improvement in accordance with claim 1 and further comprising, means for establishing the stiffness of said game racket between said handle portion and the center line of said head portion greater than the stiffness between said center line and the head tip.
Claim 6
Dependent Claim 55 words
The improvement in accordance with claim 1 wherein said center of gravity is substantially within the range of 12/27 to 13/27 the racket length from the end of said handle portion and said center of percussion is substantially within the range of 22/27 to 23/27 the racket length from the end of said handle portion.
Claim 7
Dependent Claim 36 words
The improvement in accordance with claim 5 wherein said handle weight means and said side weight means each has a weight substantially within the range of 3% to 7% the total weight of said game racket.
Claim 8
Dependent Claim 36 words
The improvement in accordance with claim 1 wherein said handle weight means and said side weight means each has a weight substantially within the range of 3% to 7% the total weight of said game racket.
Claim 9
Dependent Claim 94 words
In a game racket having at least a head portion with top, bottom and two sides and a handle portion the improvement comprising, side weight means located at one side only of the head portion for reducing the strain on the anatomy of the arm when a player makes an off-center hit with the side weight means up when the hit occurs, and gripping means on said handle portion for guiding the hand of a player to grip said handle portion so that said side weight means is always on top when normally stroking.
Claim 10
Dependent Claim 94 words
In a game racket having at least a head portion with top, bottom and two sides and a handle portion the improvement comprising, side weight means located at one side only of the head portion for reducing the strain on the anatomy of the arm when a player makes an off-center hit with the side weight means up when the hit occurs, and gripping means on said handle portion for guiding the hand of a player to grip said handle portion so that said side weight means is always on top when normally stroking.
Claim 11
Dependent Claim 107 words
The improvement in accordance with claim 8 and further comprising, handle weight means located in said handle portion and coacting with said side weight means for establishing the center of gravity of said game racket at a point closer to the end of the handle portion than to the tip of the head portion and a center of percussion relative to a center of rotation in said handle portion located between the tip of the head portion and the midline of the head portion for reducing the strain on the anatomy of the arm when an off-center hit occurs on the tip side of the head midline.

References Cited (Backward Citations)

US1539019A Cited
GB310350A Cited
GB310566A Cited
US2164631A Cited
US2395864A Cited
US3568290A Cited
FR1526906A Cited
CA848826A Cited
US3801099A Cited
US3833219A Cited
US3913911A Cited
US4058312A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-05-07 1982-11-06 1983-05-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-05-07 1986-11-06 1987-05-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-05-07 1990-11-06 1991-05-08 $7700.00 Window Closed / Lapsed

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