US3843121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Racket with replaceable string frame
Assignee: Individual
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Filing: 1972-03-06
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Granted: 1974-10-22
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Expires: 1992-03-06
Abstract
Abstract A racket for use in playing tennis or similar games, the racket having a removable playing surface. The racket-frame is provided with an opening, and a removable string-frame is provided to carry the playing surface. The string-frame can be easily removed from the racket-frame, and another string-frame with a new playing surface can be inserted into the racket-frame and secured by fastening means.
Inventors
- 👤 T Edlefsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:26
CPC Classifications
A; A63; A63B; A63B49/00; A63B49/02; A63B49/038
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
A racket having a replaceable string-frame, said racket including a shank, a handle at one end of said shank and a racket-frame at the opposite end of said shank and fixed thereto, said racket-frame being configured to hold said string-frame, said string-frame carrying a string playing surface, said stringframe having substantially the same configuration as said racketframe, said racket-frame having an upwardly extending flange means substantially perpendicular to the plane of said playing surface and an flange means, the inner periphery of said racketframe defining an opening therein, said inwardly extending flange extending into said opening to receive said string-frame, and retaining means to secure said string-frame within said racketframe, said retaining means being removably located on said upwardly extending flange means and extending inwardly therefrom and being opposite said inwardly extending flange means and spaced therefrom a distance substantially equal to the thickness of said string-frame.
Claim 2
Dependent Claim
147 words
A racket having a replaceable string-frame, said racket including a shank, a handle at one end of said shank and a racket-frame at the opposite end of said shank and fixed thereto, said racket-frame being configured to hold said string-frame, said string-frame carrying a string playing surface, said stringframe having substantially the same configuration as said racketframe, said racket-frame having an upwardly extending flange means substantially perpendicular to the plane of said playing surface and an flange means, the inner periphery of said racketframe defining an opening therein, said inwardly extending flange extending into said opening to receive said string-frame, and retaining means to secure said string-frame within said racketframe, said retaining means being removably located on said upwardly extending flange means and extending inwardly therefrom and being opposite said inwardly extending flange means and spaced therefrom a distance substantially equal to the thickness of said string-frame.
Claim 3
Dependent Claim
27 words
A racket according to claim 1 and further characterized in that the string-frame has an outwardly facing peripheral groove to recess the strings of the playing surface.
Claim 4
Dependent Claim
39 words
A racket according to claim 2 wherein said string-frame has a plurality of holes communicating with said peripheral groove to recess the strings of the playing surface and a plurality of bushings is receivable within the plurality of (holes).
Claim 5
Dependent Claim
132 words
A racket having a replaceable string-frame, said racket including a shank, a handle at one end of said shank and a racket-frame at the opposite end of said shank and fixed thereto, said racket-frame being configured to hold said string-frame, said string-frame carrying a string playing surface, said string-frame having substantially the same configuration as said racket-frame, said racket-frame being approximately L-shaped in cross section comprising an upwardly extending flange substantially perpendicular to the plane of the playing surface and an inwardly extending flange to receive said string-frame an inwardly facing groove located in said upwardly extending flange and away from said inwardly extending flange a distance substantially equal to the thickness of said string-frame, and a snap ring receivable within said inwardly facing groove for locking said string-frame in said racket-frame.
Claim 6
Dependent Claim
132 words
A racket having a replaceable string-frame, said racket including a shank, a handle at one end of said shank and a racket-frame at the opposite end of said shank and fixed thereto, said racket-frame being configured to hold said string-frame, said string-frame carrying a string playing surface, said string-frame having substantially the same configuration as said racket-frame, said racket-frame being approximately L-shaped in cross section comprising an upwardly extending flange substantially perpendicular to the plane of the playing surface and an inwardly extending flange to receive said string-frame an inwardly facing groove located in said upwardly extending flange and away from said inwardly extending flange a distance substantially equal to the thickness of said string-frame, and a snap ring receivable within said inwardly facing groove for locking said string-frame in said racket-frame.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |